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WO2016001968A1 - Dispositif d'allumage pour un moteur à combustion interne - Google Patents

Dispositif d'allumage pour un moteur à combustion interne Download PDF

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Publication number
WO2016001968A1
WO2016001968A1 PCT/JP2014/067363 JP2014067363W WO2016001968A1 WO 2016001968 A1 WO2016001968 A1 WO 2016001968A1 JP 2014067363 W JP2014067363 W JP 2014067363W WO 2016001968 A1 WO2016001968 A1 WO 2016001968A1
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WO
WIPO (PCT)
Prior art keywords
ignition
timing
voltage
coil
primary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2014/067363
Other languages
English (en)
Japanese (ja)
Inventor
琢磨 鮎沢
雄姿 鈴木
正幸 杉山
真 羽佐田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle Electric Drive Systems Co Ltd
Original Assignee
Kokusan Denki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kokusan Denki Co Ltd filed Critical Kokusan Denki Co Ltd
Priority to CN201480080332.3A priority Critical patent/CN107076096B/zh
Priority to PCT/JP2014/067363 priority patent/WO2016001968A1/fr
Priority to JP2016530693A priority patent/JP6412572B2/ja
Publication of WO2016001968A1 publication Critical patent/WO2016001968A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/06—Other installations having capacitive energy storage
    • F02P3/08—Layout of circuits

Definitions

  • the present invention relates to a current interrupting type ignition device for an internal combustion engine.
  • a permanent magnet is attached to the outer periphery of a flywheel attached to the crankshaft of the engine to provide a three-pole magnet field.
  • a magnet generator (flywheel magnet) composed of a magnet rotor configured as shown in FIG. 1 and a stator formed by winding an ignition coil around an iron core having a pair of magnetic pole portions facing the magnetic poles of the magnet rotor is used as an ignition power source.
  • the batteryless ignition device used is widely adopted.
  • the primary coil of the ignition coil also serves as the power generation coil for the ignition power source, and the first half wave having one polarity and the other polarity having the first polarity.
  • the main half-wave with the highest peak value is the second half-wave, and this second half-wave voltage is used to obtain ignition energy. Used.
  • Both ends of the primary coil of the ignition coil provided in the stator of the magnet generator are connected in parallel with current control switches composed of semiconductor switch elements such as IGBTs and bipolar transistors that can be controlled on and off.
  • the switch and the magnet generator constitute an ignition circuit.
  • An ignition control unit is provided for controlling the ignition timing of the internal combustion engine by controlling the timing at which the current control switch is switched from the on state to the off state at the engine ignition timing.
  • the ignition control unit and the ignition circuit A current interrupting type ignition device for an internal combustion engine is configured.
  • the collector potential of the transistor is The collector-emitter circuit of the transistor is connected in parallel to both ends of the primary coil of the ignition coil so as to have a positive potential with respect to the emitter.
  • the collector and base of the transistor are connected through a biasing resistor, and the second half-wave voltage induced in the primary coil of the ignition coil reaches a predetermined level and passes through the biasing resistor from the collector side of the transistor.
  • a thyristor is connected between the base and emitter of the transistor constituting the current control switch, and the thyristor is turned on at the ignition timing of the internal combustion engine.
  • the transistor that has been in the on state until is turned off.
  • the primary current flowing from the primary coil of the ignition coil through the collector-emitter of the transistor is cut off, so the primary current that has been flowing so far will continue to flow through the primary coil of the ignition coil.
  • a high voltage is induced, and this voltage is boosted to a high voltage for ignition by a boost ratio between the primary and secondary of the ignition coil. Since the high voltage for ignition induced in the secondary coil of the ignition coil is applied to the spark plug attached to the cylinder of the internal combustion engine, a spark discharge is generated in the discharge gap of the spark plug and the engine is ignited.
  • the secondary coil of the ignition coil is ignited by changing the current control switch connected in parallel to the primary coil of the ignition coil from the on state to the off state.
  • the ignition timing of the engine can be controlled by providing an ignition control unit that controls the timing of switching the current control switch from the on state to the off state in order to induce a high voltage for ignition.
  • a microcomputer is provided to configure an ignition control unit, and a trigger is provided on the primary side of the ignition coil in order to supply the microcomputer with power supply voltage and engine rotation information.
  • a coil is provided.
  • the trigger coil is provided so as to induce a voltage having the same phase as that of the primary coil, and the induced voltage is input to the power supply circuit and the periodic signal generator.
  • the power supply circuit converts the voltage induced in the trigger coil when the first half-wave voltage and the third half-wave voltage are induced in the primary coil of the ignition coil into a constant DC voltage, and converts the DC voltage to This is given to the power supply terminal of the microcomputer and the periodic signal generator.
  • the periodic signal generation unit shapes and shapes the voltage induced in the primary coil of the ignition coil, whereby the rising and falling of each of the first half-wave voltage and the second half-wave voltage induced in the primary coil
  • a rectangular wave signal in which a level change occurs is generated as a periodic signal, and this periodic signal is applied to the interrupt signal input terminal of the microcomputer.
  • the microcomputer detects the rotational speed of the internal combustion engine from the generation period of the periodic signal (the time required for one rotation of the crankshaft), calculates the ignition timing of the engine with respect to the detected rotational speed, and calculates the calculated ignition
  • the thyristor connected between the base emitters of the transistors constituting the current control switch is turned on to perform the ignition operation.
  • the trigger coil is omitted, and the voltage induced in the primary coil of the ignition coil is input to the power supply circuit and the periodic signal generator.
  • the power supply circuit converts the first half-wave voltage and the third half-wave voltage induced in the primary coil of the ignition coil into a constant DC voltage and supplies the microcomputer with the power supply voltage.
  • the periodic signal generation unit applies a rectangular wave-shaped periodic signal obtained by shaping the voltage induced in the primary coil to the interrupt signal input terminal of the microcomputer.
  • a current control switch is configured by a transistor in which a collector-emitter circuit is connected in parallel to the primary coil of the ignition coil, and the transistor is turned off between the base and emitter of the transistor.
  • a thyristor is connected to The collector and base of the transistor are connected via a biasing resistor, and when the second half-wave voltage induced in the primary coil of the ignition coil reaches a predetermined level, the collector side of the transistor is changed to the base.
  • a predetermined base current is supplied to turn on the transistor, and when the thyristor is turned on, the transistor is turned off to perform the ignition operation.
  • induction is induced in the primary coil of the ignition coil both at the start of the engine and at the time of normal operation after completion of the start. Ignition operation by calculating the ignition timing of the engine with respect to the rotation speed of the engine detected using the periodic signal obtained by waveform shaping of the voltage, and turning off the current control switch at the calculated ignition timing Therefore, after starting the engine starting operation, the ignition operation could not be performed until the microcomputer was activated and the engine speed could be detected.
  • the current interruption type ignition device since it is necessary to allow a large current to flow through the primary coil of the ignition coil, it is necessary to reduce the number of turns of the primary coil. Therefore, when the cranking rotation speed at the time of starting is low, the first half-wave voltage used to supply the microcomputer with the power supply voltage among the first to third half-wave voltages induced in the primary coil and the first half-wave voltage It becomes difficult to reach the peak value of the half-wave voltage of 3 to a level necessary for securing the power supply of the microcomputer, and it becomes difficult to maintain the microcomputer in the operating state.
  • the current interrupting ignition device in which the microcomputer is operated with the voltage induced in the primary coil of the ignition coil without controlling the battery and the ignition timing is controlled by the microcomputer is the cranking at the start.
  • the speed decreases there is a problem that the ignition operation cannot be performed and the engine fails to start.
  • the microcomputer when starting an engine using a starter that is operated manually, such as a recoil starter or a kick starter, the microcomputer is operated while the crankshaft rotates one or more times after starting the engine. Since it is difficult to continue to supply a voltage higher than the voltage value necessary for operation from the primary coil of the ignition coil to the power supply circuit, the probability of failure to start the engine increases with the conventional ignition device. It was inevitable.
  • the object of the present invention is to enable the initial ignition operation without delay after the power supply voltage of the microcomputer is established, and to start the engine even when the engine is started by a starter operated by human power.
  • An object of the present invention is to provide a current interrupting type ignition device for an internal combustion engine which can be easily performed.
  • a primary coil and a secondary coil are provided on a stator of a magnet generator attached to an internal combustion engine, so that a negative first half wave, a positive second half wave, and a negative first 3 is connected in parallel to the ignition coil that induces an alternating voltage having a waveform in which three half-waves sequentially appear in the primary coil once during the rotation of the crankshaft of the internal combustion engine, and the primary coil of the ignition coil.
  • An ignition circuit that performs an ignition operation by inducing a high voltage for ignition in a secondary coil of the ignition coil when the current control switch is turned from an on state to an off state;
  • An ignition device for an internal combustion engine including an ignition control unit that controls on / off of a current control switch to control timing (ignition timing) at which the ignition circuit performs an ignition operation is intended.
  • the present specification discloses at least the following first to tenth inventions.
  • 1st invention In 1st invention disclosed by this specification, the primary current detection part which detects the primary current which flows through the primary coil of an ignition coil, and the information of the primary current detected by the said primary current detection part are obtained.
  • a microcomputer that performs processing necessary to configure the ignition control unit, and converts the first half-wave voltage and the third half-wave voltage induced in the primary coil of the ignition coil into a DC voltage.
  • a power supply circuit for supplying the DC voltage to the microcomputer as a power supply voltage.
  • the ignition control unit provides a switch driving means for providing a drive signal to the current control switch so that the current control switch can be turned on until the second half-wave voltage is induced in the primary coil.
  • a reference timing detection means for detecting, as a reference timing, a timing at which the primary current detected by the primary current detection unit reaches a threshold, and a waveform of the primary current detected by the primary current detection unit at the start of the internal combustion engine.
  • a start point fire control means for obtaining a timing that can be used as an ignition timing at the start time as a start point fire timing, and immediately turning off the current control switch and performing an ignition operation in the ignition circuit when the start point fire timing is determined;
  • the point of the internal combustion engine with respect to the rotational speed information of the internal combustion engine obtained from the cycle in which the reference timing is detected after the start of the internal combustion engine is completed By calculating the time, and a normal ignition control means for causing an ignition operation in an ignition circuit by turning off state current control switch when detecting the calculated ignition timing.
  • switch driving means for providing a drive signal to the current control switch until the second half-wave voltage is induced in the primary coil so that the current control switch can be turned on.
  • the current control switch can be turned on to flow the primary current without causing a large delay.
  • a timing that can be used as the ignition timing at the start of the internal combustion engine is obtained as a start timing fire timing from the waveform of the primary current detected by the primary current detector when the internal combustion engine is started, and the start timing fire timing is determined.
  • a starting point fire control means that immediately turns off the current control switch to perform an ignition operation when it is obtained, the crankshaft rotates once and the engine speed is detected when the engine is started. Without waiting, the first ignition can be performed when the second half-wave (positive half-wave) voltage is first induced in the primary coil after the microcomputer is started. Therefore, after starting the engine starting operation, the engine can be started quickly and the engine can be started, and the cranking of the engine can be performed at a sufficient speed as in the case of starting the engine manually. Even if it is difficult to do so, the engine can be easily started.
  • the current interruption type ignition device generates larger ignition energy as the current value at the time of interrupting the primary current of the ignition coil is larger.
  • the initial ignition timing at the start of the engine is set as the ignition timing at the start. It is possible to determine the timing at which sufficient ignition energy can be obtained at the timing to obtain the engine, and to properly perform the initial explosion of the engine, thereby facilitating the start of the engine.
  • the reference timing detection means for detecting the timing at which the primary current of the ignition coil reaches the threshold value as the reference timing is provided in the ignition control unit constituted by a microcomputer, and the reference timing detection means Since the engine rotational speed information is obtained from the period at which the reference timing is detected, it is not necessary to separately provide a circuit for generating a crank signal that gives information on the crank angle of the engine. Therefore, according to the first invention, in addition to the ignition circuit configured by the ignition coil and the current control switch, the primary current detection unit, the microcomputer that configures the ignition control unit, and the power supply voltage to the microcomputer. It is possible to configure the ignition device simply by providing a power supply circuit for supplying the power, and to simplify the configuration of the ignition device.
  • a crank angle of an internal combustion engine using a primary current detector that detects a primary current flowing through the primary coil of the ignition coil and a voltage induced in the primary coil.
  • a power supply circuit that converts the first half-wave voltage and the third half-wave voltage induced in the primary coil of the ignition coil into a DC voltage and supplies the DC voltage as a power supply voltage to the microcomputer And are provided.
  • the ignition control unit can turn on the current control switch by supplying a drive signal to the current control switch until the second half-wave voltage is induced in the primary coil. And a timing that can be used as the ignition timing at the start of the internal combustion engine from the waveform of the primary current detected by the primary current detector at the start of the internal combustion engine.
  • a starting point fire control means for performing an ignition operation by immediately turning off the current control switch when the timing is obtained, and the rotational speed information of the internal combustion engine obtained from the crank signal generation interval after the start of the internal combustion engine is completed
  • the ignition timing of the internal combustion engine is determined with respect to the ignition circuit, and when the determined ignition timing is detected, the ignition circuit is ignited by turning off the current control switch. And a normal ignition control means.
  • the engine after starting the engine starting operation, the engine can be started by promptly performing the initial explosion of the engine, and the engine can be started manually. Even in this case, it is possible to easily start the engine.
  • the ignition timing at the start of the engine is determined by monitoring the waveform of the primary current that is directly related to the magnitude of the ignition energy, sufficient ignition energy can be reliably obtained for the initial ignition timing at the start of the engine. It is possible to make sure that the first explosion of the engine is performed at a fixed time.
  • the third invention is applied to the first invention or the second invention.
  • the first half-wave voltage induced by the primary coil and the third half-wave The power supply circuit is configured to convert a voltage into a DC voltage and to supply the DC voltage to the microcomputer as a power supply voltage.
  • 4th invention 4th invention is applied to 1st invention or 2nd invention,
  • an ignition coil is connected in series with respect to a primary coil, and is induced to this primary coil.
  • An additional coil for inducing a voltage having the same phase as the voltage to be applied is provided on the primary side.
  • the power supply circuit includes a voltage induced in the additional coil when the first half-wave voltage is induced in the primary coil and a voltage induced in the additional coil when the third half-wave voltage is induced in the primary coil. Is converted to a DC voltage.
  • the fifth invention is applied to the first invention or the second invention.
  • the timing at which the primary current detected by the primary current detector reaches the peak value is started.
  • the starting point fire control means is configured to obtain the ignition timing.
  • the sixth invention is also applied to the first invention or the second invention.
  • the primary current detected by the primary current detector is set after the peak value has passed.
  • the starting point fire control means is configured to obtain the timing when the level falls to the level as the starting point fire timing.
  • the seventh invention is applied to the first invention or the second invention.
  • the ignition control unit performs an ignition operation performed after starting the starting operation of the internal combustion engine.
  • the ignition timing is controlled by the starting point fire control means until the number of times reaches the set number, and after the number of ignition operations performed after starting the internal combustion engine starting operation reaches the set number, it is normal
  • the ignition timing is controlled by the hour ignition control means.
  • the crank signal generator receives an AC voltage induced in the primary coil of the ignition coil as an input, and the AC voltage The crank signal is generated at the timing when the first half wave of the waveform starts or when the waveform of the AC voltage shifts from the first half wave to the second half wave.
  • the ignition coil includes an additional coil that is connected in series to the primary coil and induces a voltage having the same phase as the voltage induced in the primary coil on the primary side.
  • the crank signal generation unit receives the voltage induced in the additional coil as an input, the timing at which the first half wave of the waveform of the AC voltage induced in the primary coil starts or the waveform of the AC voltage induced in the primary coil is the first. The crank signal is generated at the timing of transition from the first half wave to the second half wave.
  • the tenth invention is applied to the first invention or the second invention.
  • the primary current of the ignition coil is induced when the primary current of the ignition coil is cut off.
  • primary induced voltage limiting means for limiting the voltage induced in the primary coil of the ignition coil when the current control switch is cut off to a set level or less is provided.
  • the first ignition can be performed when the positive half-wave voltage is first induced in the primary coil. Therefore, after starting the engine starting operation, the engine can be started quickly without waiting for the crankshaft to make one revolution, as in the case of starting the engine manually. Even if it is difficult to crank the engine at a sufficient speed, the engine can be easily started.
  • the ignition timing at the start of the engine is obtained from the waveform of the primary current that is directly related to the magnitude of the ignition energy, when the engine is started, the ignition timing can be obtained with sufficient ignition energy. Therefore, it is possible to improve the engine starting performance.
  • the ignition control unit constituted by the microcomputer is provided with the reference timing detection means for detecting the timing at which the primary current of the ignition coil reaches the threshold as the reference timing. Since the engine rotational speed information necessary for calculating the ignition timing in the normal operation after the completion of the engine start is obtained from the period in which the engine is detected, a signal for obtaining the engine rotational speed information is generated.
  • the hardware circuit can be omitted, and the configuration of the ignition device can be simplified.
  • FIG. 2 is a circuit diagram illustrating a configuration example of hardware of the embodiment illustrated in FIG. 1. It is the block diagram which showed the structure of other embodiment of this invention.
  • FIG. 5 is a circuit diagram illustrating a configuration example of hardware of the embodiment illustrated in FIG. 4. It is the block diagram which showed the structure of other embodiment of this invention.
  • FIG. 7 is a circuit diagram illustrating a hardware configuration example of the embodiment illustrated in FIG. 6. It is the block diagram which showed the structure of other embodiment of this invention.
  • FIG. 9 is a circuit diagram illustrating a hardware configuration example of the embodiment illustrated in FIG. 8.
  • FIG. 5 is a time chart schematically showing voltage and current waveforms of respective parts of the embodiment shown in FIG. 1 and the embodiment shown in FIG. 4.
  • FIG. 9 is a time chart schematically showing voltage and current waveforms of respective parts of the embodiment shown in FIG. 6 and the embodiment shown in FIG. 8.
  • FIG. 13 is a flowchart illustrating an example of an algorithm for a memory initialization process performed in the main routine illustrated in FIG. 12. It is the flowchart which showed an example of the algorithm of the starting A / D process performed at the time of engine starting in each embodiment.
  • FIG. 5 is a flowchart illustrating an example of an algorithm of a reference timing interrupt process executed every time the reference timing detection unit detects a reference timing in the embodiment of FIG. 1 and the embodiment of FIG. 5 is a flowchart showing an algorithm of processing executed when the time when the timer X is set is measured in the embodiment of FIG. 1 and the embodiment of FIG. 4. It is the flowchart which showed the algorithm of the process performed when the measurement of the time when the ignition timer was set in each embodiment was completed.
  • FIG. 6 and the embodiment shown in FIG. 8 an algorithm of processing executed when a crank signal is input to the interrupt input terminal of the microcomputer when the first half-wave voltage is generated is shown. It is a flowchart.
  • the present invention can be applied to an ignition device for igniting a two-cycle internal combustion engine and an ignition device for igniting a four-cycle internal combustion engine.
  • the internal combustion engine to be ignited is a four-cycle engine. Suppose there is.
  • FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention.
  • 1 is a magnet generator attached to an internal combustion engine (not shown).
  • the magnet generator 1 includes a primary coil Wp and a secondary coil Ws of an ignition coil IG on an iron core having a three-pole magnet rotor attached to a crankshaft of an internal combustion engine and a magnetic pole portion facing the magnetic pole of the magnet rotor.
  • 10B and 11B as schematically shown in FIGS. 10B and 11B, the first half-wave voltage V1 and the second half-wave voltage are included.
  • An AC voltage having a waveform in which V2 and a third half-wave voltage V3 appear in sequence is induced in the primary coil Wp only once during one revolution of the crankshaft of the internal combustion engine.
  • the first half-wave voltage V1 and the third half-wave voltage V3 have negative polarity with relatively low peak values.
  • the second half-wave voltage V2 is a positive voltage having a peak value higher than that of the first half-wave voltage and the third half-wave voltage. In the current interruption type ignition device, the second half-wave voltage V2 having a high peak value is used to obtain ignition energy.
  • a magnet generator 1 shown in FIG. 2 includes a magnet rotor 1a attached to an engine crankshaft (not shown) and a stator 1b fixed to an engine case (not shown). It consists of.
  • the magnet rotor 1a has a cup-shaped flywheel 101 attached to the crankshaft of the engine and an arc-shaped permanent magnet fixed in a recess 102 formed on the outer periphery of the flywheel and magnetized in the radial direction of the flywheel. It consists of a magnet 103.
  • the magnetic pole on the outer peripheral side of the permanent magnet 103 (N pole in the illustrated example) and the magnetic pole on the inner peripheral side of the permanent magnet led to the outer peripheral surface of the flywheel located on both sides of the recess 102.
  • S pole constitutes a (three pole) magnet field having three magnetic poles arranged in the circumferential direction of the flywheel.
  • the stator 1b includes a rod-shaped main iron core 104 made of a laminate of steel plates, and a pair of yokes 105 and 106 each having a rear end portion fixed to one end and the other end of the main iron core 104 in the longitudinal direction.
  • a character-shaped iron core 107 and an ignition coil IG wound around the main iron core 104 are provided.
  • Magnetic pole portions 108 and 109 having cylindrical magnetic pole surfaces are formed at the tips of the yokes 105 and 106, and these magnetic pole portions are opposed to the outer peripheral surface of the magnet rotor via a gap.
  • the ignition coil IG includes a primary coil Wp wound around a primary bobbin 110 fixed to the iron core main part 104, and a secondary coil Ws wound around a secondary bobbin 111, and the secondary coil is wound.
  • the secondary bobbin 111 thus fitted is fitted on the outer periphery of the primary coil Wp.
  • an ignition unit 113 configured by mounting elements necessary for controlling the current flowing through the primary coil Wp of the ignition coil on the printed circuit board 112 is disposed.
  • the ignition unit 113 and the primary coil Wp are arranged. Are connected via a conductor 114.
  • the ignition coil IG and the ignition unit 113 are inserted into a resin case 115, and the ignition coil IG and the ignition unit 113 are molded by casting a thermosetting insulating resin in the case 115. .
  • the high voltage cord 116 is led out from the non-grounded terminal of the secondary coil Ws of the ignition coil, and a high voltage for ignition induced in the secondary coil Ws is supplied through the high voltage cord 116 to the ignition plug attached to the cylinder of the engine.
  • the ignition coil IG, the ignition unit 113, and the case 115 for housing them constitute a current interrupting type ignition device IU for an internal combustion engine.
  • the ignition device IU is arranged with the magnetic pole portions 108 and 109 of the iron core 107 opposed to the outer peripheral surface on which the magnetic poles of the magnet rotor are formed with a predetermined gap therebetween, and the yoke of the iron core 107 of the ignition coil IG.
  • the iron core 107 is fastened to a stator mounting portion provided in an engine case or the like by bolts passing through mounting holes h1 and h2 formed in 105 and 106, respectively, thereby being fixed to the case of the internal combustion engine.
  • the three magnetic poles of the field SNS of the magnet rotor 1a are the magnetic pole portions of the iron core 107 of the stator.
  • the magnetic flux ⁇ flowing through the iron core 107 alternates as shown in FIGS. 10 (A) and 11 (A), and the change in this magnetic flux causes the primary coil Wp of the ignition coil to As shown in FIGS. 10 (B) and 11 (B), an AC voltage having a waveform in which a first half-wave voltage V1, a second half-wave voltage V2, and a third half-wave voltage V3 appear in order. Induces.
  • An alternating voltage is also induced in the secondary coil Ws by the alternating magnetic flux ⁇ , but the voltage induced in the secondary coil Ws reaches a voltage that causes a spark discharge in the spark plug before the primary current flowing in the primary coil Wp is cut off. Therefore, the ignition operation is not performed by the secondary voltage.
  • a current control switch 2 is connected in parallel to the primary coil Wp of the ignition coil IG, and the ignition circuit 3 is configured by the ignition coil IG and the current control switch 2.
  • the current control switch 2 is a semiconductor switch such as an insulated gate transistor (IGBT), a bipolar transistor, a field effect transistor (MOSFET) and the like that can be controlled on and off, and a positive-polarity second coil is connected to the primary coil Wp of the ignition coil. It is turned on when a half-wave voltage is induced.
  • the current control switch 2 When the current control switch 2 is turned on, the primary current I1 flows from the primary coil Wp through the current control switch 2.
  • the current control switch 2 is turned off at the ignition timing of the internal combustion engine by an ignition control unit 10 to be described later.
  • a high-polarity voltage that induces the primary current I1 that has been flowing until then is induced in the primary coil Wp. Since this voltage is boosted by the step-up ratio between the primary and secondary of the ignition coil, an ignition high voltage of 20 to 30 [kV] is induced in the secondary coil Ws of the ignition coil. Since the high voltage induced in the secondary coil Ws is applied to the spark plug 4 attached to the cylinder of the internal combustion engine, spark discharge occurs in the discharge gap of the spark plug 4 and the engine is ignited.
  • a microcomputer (not shown in FIG. 1) is provided to configure the ignition control unit 10.
  • the microcomputer executes a program for performing processing for controlling the ignition timing of the internal combustion engine (timing for turning the current control switch 2 from the on state to the off state).
  • Vcc a DC voltage value (usually 5 [V])
  • a power supply circuit 5 for supplying the DC voltage Vcc to the power supply terminal of the microcomputer is provided.
  • the power supply circuit 5 includes, for example, a first capacitor that is charged to a constant voltage with a negative first half-wave voltage V1 and a third half-wave voltage V3 that are induced in the primary coil Wp, and the first capacitor And a pumping circuit that shifts the charge accumulated in the capacitor to the second capacitor and generates a DC voltage having a polarity obtained by inverting the voltage at both ends of the first capacitor at both ends of the second capacitor. .
  • a primary current detector 6 that detects the primary current I1 flowing through the current control switch 2 and supplies the detected primary current information to the A / D input terminal of the microcomputer.
  • the primary current detector 6 is connected in series with the current control switch 2 and the primary coil Wp so that the primary current I1 flows, and when the primary current I1 flows, the primary current detector 6 sets the current value of the primary current.
  • It can be constituted by a current limiting element that produces a proportional voltage drop at both ends.
  • a shunt resistor, a diode array configured by connecting a plurality of diodes in the same direction in series, or the like can be used.
  • the primary current detection unit 6 can also be configured by a hall current sensor or the like.
  • the ignition control unit 10 composed of a microcomputer includes a switch drive unit 11, a reference timing detection unit 12, a starting point fire control unit 13, and a normal point fire control unit 14. These means will be described below.
  • the switch driving means 11 gives a drive signal to the current control switch until the positive second half-wave voltage V2 is induced in the primary coil Wp so that the current control switch can be turned on. It is a means to put.
  • the microcomputer starts the engine operation and the power supply circuit 5 generates a voltage necessary for starting the microcomputer, after resetting each part such as a memory and a timer (after power-on reset)
  • the switch driving means 11 is constituted by a process of applying a drive signal to the current control switch 2.
  • the reference timing detection means 12 is a means for detecting a reference timing used as a timing for detecting the rotational speed of the internal combustion engine and a timing for starting measurement of the ignition timing of the engine. As shown in FIG. 10D, the reference timing detection means 12 detects a timing tc at which the primary current I1 detected by the primary current detector 6 reaches the threshold value Ith as a reference timing. The microcomputer reads the primary current information given from the primary current detector 6 to the A / D input terminal at a minute time interval, compares the read primary current information with a threshold value, and the read primary current information exceeds the threshold value. Is detected as a reference timing. Since the waveform of the primary current I1 changes with a constant correlation with the crank angle of the engine (crankshaft rotation angle position), at the reference timing tc, the crank angle position of the engine is a constant position (reference crank angle). Timing).
  • Start-up fire control means 13 obtains a timing that can be used as the ignition timing at the start of the internal combustion engine from the waveform of the primary current detected by the primary current detector 6 at the time of starting the internal combustion engine as a starting point fire timing. This is a means for performing the process of turning off the current control switch 2 immediately when the timing is obtained (the process of removing the drive signal applied to the current control switch 2) and causing the ignition circuit to perform an ignition operation. . If the ignition timing at the start of the internal combustion engine is too advanced relative to the timing at which the piston of the engine reaches top dead center, the piston will be pushed back without exceeding the top dead center when the engine is ignited. Not only does it fail to start the engine, but also the driver operating the starter is impacted, which is not preferable. The phenomenon in which the piston is pushed back without being able to exceed top dead center when the engine is ignited is called ketchin or kickback.
  • the timing that can be used as the ignition timing at the start of the internal combustion engine is a position that is not advanced too much with respect to the timing when the crankshaft of the engine reaches top dead center.
  • this is the timing at which a sufficient cut-off current value (a value of the primary current when the current control switch 2 is turned off to cut off the primary current) to obtain energy for igniting the engine is obtained. Since the waveform of the primary current I1 changes with a constant correlation with the crank angle of the engine, if the ignition timing at the start is determined based on the waveform of the primary current, it is suitable for the start of the engine as the ignition position at the start Ignition can be performed at a different crank angle position.
  • the crank angle position of the crankshaft of the internal combustion engine reaches a position where the piston of the engine reaches the top dead center (top dead center position) or a position slightly advanced from the top dead center position
  • the primary current I1 It is assumed that the stator 1b of the magnet generator is arranged so that reaches the peak.
  • the crank angle position that can be used as the ignition position at the start of the engine is, for example, the position where the primary current I1 reaches the peak or the energy necessary to ignite the engine after the primary current I1 passes the peak. This is the crank angle position when the current cut-off value is lowered to a set level that is set so as not to fall below the minimum value of the current cutoff value that is allowed to be obtained.
  • the starting point fire control means 13 is configured to obtain the timing at which the primary current detected by the primary current detector 6 reaches the peak value as the starting point fire timing, or detected by the primary current detector 6. The timing when the primary current that has been reduced to a set level after passing the peak value is determined as the starting ignition timing.
  • Normal point fire control means 14 calculates the ignition timing of the internal combustion engine with respect to the rotational speed information of the internal combustion engine obtained from the period in which the reference timing is detected by the reference timing detection means 12 after the start of the internal combustion engine is completed. When the calculated ignition timing is detected, the current control switch is turned off to cause the ignition circuit 3 to perform an ignition operation.
  • the normal time point fire control means 14 is composed of a rotational speed calculation means 14A, a normal time point fire timing calculation means 14B, a normal time point fire timing detection means 14C, and a switch-off means 14D. Yes.
  • the rotation speed calculation unit 14A detects the current reference timing from the time when the previous reference timing was detected. This is a means for calculating the rotational speed of the engine from the time until (the time required for one rotation of the crankshaft).
  • the normal time-of-fire timing calculating means 14B is means for calculating the ignition timing of the engine at the rotational speed calculated by the rotational speed calculating means 14A.
  • This normal point fire timing calculation means searches the ignition timing calculation table (map) that gives the relationship between the rotation speed and the ignition timing with respect to the rotation speed calculated by the rotation speed calculation means 14A, and the searched value Is subjected to an interpolation calculation to calculate the ignition timing of the engine at the calculated rotational speed.
  • the normal ignition timing calculation means 14B calculates the ignition timing with respect to the calculated rotation speed every time the rotation speed is calculated at the reference timing, and stores the calculated ignition timing in the RAM of the microcomputer.
  • the normal time-of-fire timing detection means 14C causes the ignition timer in the microcomputer to measure the ignition timing calculated at the previously detected reference timing and stored in the RAM. The time is calculated as the ignition timing measurement time, the calculated ignition timing measurement time is immediately set in the ignition timer, and the measurement is started.
  • the normal time ignition timing detection means 14C uses the timing when the measurement of the ignition timing measurement time when the ignition timer is set as the ignition timing, and gives a switch-off command to the switch-off means 14D when the ignition timing is detected.
  • the switch-off means 14D is a process for turning off the current control switch 2 at the timing when the switch-off command is given from the normal-time-fire-timing detection means 14C (removes the drive signal given to the current control switch 2).
  • the current control switch 2 is turned off.
  • the current control switch 2 is constituted by an IGBT (insulated gate transistor) T1 having a collector connected to the non-grounded terminal of the primary coil Wp of the ignition coil.
  • IGBT insulated gate transistor
  • a shunt resistor Rs is connected between the emitter of the IGBT T1 and the ground side terminal of the primary coil Wp, and the primary current detector 6 is configured by this shunt resistor. Since the shunt resistor Rs is connected in series with the primary coil Wp and the current control switch 2, when the primary current I1 flows from the primary coil of the ignition coil through the current control switch 2, the shunt resistor Rs A voltage drop proportional to the primary current I1 occurs at both ends. The voltage across this resistor Rs is used as the primary current detection signal.
  • the ground side terminal of the primary coil Wp is grounded together with the ground side terminal of the secondary coil Ws.
  • the power supply circuit 5 includes a diode D1 having an anode connected to the ground-side terminal of the primary coil Wp, a first capacitor C1 having one end connected to the cathode of the diode D1, and an anode connected to the other end of the capacitor.
  • a diode D2 having a cathode connected to the non-ground side terminal of the primary coil Wp, a diode D3 having an anode connected to a connection point between the capacitor C1 and the diode D1, and a first connected between the cathode of the diode D3 and the ground.
  • the first capacitor C1 is illustrated through the diodes D1 and D2. Charged to the polarity. Since the charge accumulated in the first capacitor C1 is transferred to the second capacitor C2 through the diode D3 and the resistor R1, the second capacitor C2 is charged to the polarity shown in the figure. The voltage across the second capacitor C2 is limited by the Zener voltage of the Zener diode ZD. A Zener diode ZD having a Zener voltage equal to the power supply voltage (5 [V]) of the microcomputer is used.
  • MCU is a microcomputer constituting the ignition control unit 10.
  • the microcomputer MCU includes a CPU, a memory such as a ROM and a RAM, a timer, and the like, and constitutes various function realizing means by executing programs stored in the ROM.
  • the microcomputer MCU includes a power supply terminal to which a power supply voltage Vcc is applied from the power supply circuit 5, an output port A for supplying a drive signal to the current control switch, and an A / D input port for inputting an analog signal.
  • Primary current detection signals obtained at both ends of the resistor Rs of the primary current detection unit 6 are input to the A / D input port.
  • FIG. 10A shows the change of the magnetic flux ⁇ flowing through the iron core of the ignition coil
  • FIG. 10B shows the voltage VL induced in the primary coil Wp
  • FIG. 10C shows the power supply voltage Vcc supplied from the power supply circuit 5 to the microcomputer
  • FIG. 10D shows the primary current I1.
  • FIG. 10E shows the timing operation of the ignition timer in the microcomputer
  • FIGS. 10F and 10G show the timing operation of the timer for determining the timing for turning on the IGBT T1 and the output port A of the microcomputer, respectively.
  • the power supply circuit 5 gives the power supply voltage Vcc (FIG. 10C) to the microcomputer MCU.
  • the power supply voltage Vcc decreases at a constant rate after reaching the peak value (5 V) while the first half-wave voltage is generated, but again when the third half-wave voltage V3 is generated. After the third half-wave voltage has risen and passed the peak, it decreases at a constant rate until the next first half-wave voltage V1 is generated.
  • the power supply voltage Vcc becomes the zener diode.
  • a value (5 V) equal to the Zener voltage of ZD is maintained.
  • the microcomputer MCU After starting the engine, when the power supply voltage Vcc reaches the minimum value Vth of the voltage necessary for operating the microcomputer at time ta, the microcomputer MCU is activated to perform a power-on reset.
  • the rated value of the power supply voltage Vcc of the microcomputer is 5 [V]
  • the minimum voltage Vth necessary for operating the microcomputer is about 2.3 [V].
  • the microcomputer is maintained in the operating state while the power supply voltage Vcc is maintained at the minimum value Vth or more.
  • the power supply circuit 5 is constituted by a pump circuit as shown in FIG. 3
  • the timing at which the power supply voltage Vcc reaches the peak value at the start of the engine is the first half wave of the primary voltage VL.
  • the timing at which the third half-wave voltage reaches a peak are slightly delayed.
  • the microcomputer MCU starts at time ta and performs a reset operation such as initialization of the memory. Then, as shown in FIG. 10 (G), the microcomputer starts from the output port A to the IGBT T1. A drive signal is applied between the gate and the emitter. The voltage value of this drive signal is almost the same as the voltage value of the power supply voltage Vcc of the microcomputer. As a result, the IGBT T1 can be turned on (a state in which the IGBT T1 is turned on immediately when a forward voltage higher than the threshold value is applied between the collector and the emitter). Accordingly, after the second half-wave voltage V2 of the AC voltage VL rises at time t2, when the threshold value is reached at time tb, the IGBT T1 is turned on and the primary current I1 starts to flow through the ignition coil.
  • the microcomputer MCU detects the time tc when the primary current I1 reaches the threshold value Ith from the primary current detection signal input to the A / D terminal from the primary current detector 6 as a reference timing.
  • the reference timing detection means 12 is configured by the process in which the microcomputer detects the reference timing tc.
  • the microcomputer also obtains a timing that can be used as the ignition timing at the start of the internal combustion engine from the waveform of the primary current detected by the primary current detector 6 as a start timing fire timing, and immediately determines the start timing fire timing.
  • the control switch (IGBT in this embodiment) 2 is turned off to cause the ignition circuit to perform an ignition operation.
  • the primary current detection signal input from the primary current detection unit 6 to the A / D terminal is sampled every minute time, and the newly sampled primary current value is sampled immediately before.
  • the timing td at which the primary current I1 has the maximum value is obtained as the starting ignition timing, and at the starting ignition timing td, as shown in FIG. 10 (G), from the port A to the gate of the IGBT T1
  • the given drive signal is set to zero.
  • the IGBT T1 is turned off at the ignition timing td at the starting time, and the primary current I1 that has been flowing through the ignition coil until then is cut off to perform the ignition operation.
  • the starting point fire control means 13 is configured by the process of obtaining the starting point fire timing as described above and performing the ignition operation with the IGBT turned off at the determined starting point fire timing.
  • the ignition timing control means 13 at the starting time performs an ignition operation at the end of the compression stroke of the engine, the first explosion of the engine is performed and the engine is started.
  • the microcomputer also sets a predetermined time to a timer X (on timing determination timer) that performs a time measuring operation for determining the next timing of supplying the drive signal to the IGBT when the time tc is detected as the reference timing, The time measurement is started as shown in FIG.
  • a drive signal is applied from the port A of the microcomputer to the gate of the IGBT so that the IGBT can be turned on.
  • the time to be measured by the timer X is set so that the timer completes the time measuring operation after the primary coil Wp induces the voltage of the third half wave.
  • the time to be measured by the timer X is set to a fixed time set based on the predicted value of the rotation speed of the crankshaft at the start. Set it.
  • the timer X is caused to measure the time calculated based on the rotational speed of the engine.
  • the switch driving means 11 is provided by a process of supplying a drive signal to the IGBT when the microcomputer is started and a process of supplying a drive signal from the port A of the microcomputer to the gate of the IGBT when the timer X completes the time measuring operation. Is configured.
  • a timing that can be used as an ignition timing at the start of the internal combustion engine is determined as a start timing fire timing from the waveform of the primary current detected by the primary current detector 6. Ignition operation is performed at the starting timing. If the ignition timing at the start of the internal combustion engine is too advanced with respect to the timing at which the piston of the engine reaches top dead center, the piston may not exceed top dead center and a kickback may occur. In order to prevent kickback, a magnet is installed in the engine so that the timing at which the second half-wave voltage of the AC voltage induced in the primary coil reaches a peak does not advance too much relative to the timing at which the piston reaches top dead center. Install a generator.
  • the ignition timing is controlled by the normal time fire control means 14.
  • the normal time point fire control means rotates the internal combustion engine from the period (time required for one rotation of the crankshaft) that the rotation speed calculation means 14A detects the reference timing tc. The speed is calculated, the normal time fire timing calculation means 14B calculates the normal time fire timing of the internal combustion engine with respect to the calculated rotation speed, and the calculated ignition timing is stored in the memory.
  • the normal time ignition timing detection means 14C reads the normal time ignition timing calculated and stored at the previous reference timing and detects the read normal time ignition timing.
  • the time to be measured by the ignition timer (ignition timing measurement time) is calculated, the calculated ignition timing measurement time is set in the ignition timer, and the measurement is started.
  • the normal time ignition timing detection unit 14C gives a switch-off command to the switch-off unit 14D to stop the supply of the drive signal to the IGBT. .
  • the IGBT is turned off to perform the ignition operation.
  • the detection of the completion of the start of the internal combustion engine is, for example, the normal ignition timing of the engine after starting the start operation of the internal combustion engine (ignition timing at the end of the compression stroke performed once while the crankshaft rotates twice). This can be done because the number of ignition operations performed in (1) has reached the set number (at least once).
  • the ignition control unit 10 controls the ignition timing by the start point fire control means 13 until the ignition operation is started a predetermined number of times after starting the start operation of the internal combustion engine, and the start operation of the internal combustion engine is controlled.
  • the ignition timing can be controlled by the normal point fire control means 14 after the number of ignitions performed at the regular ignition timing after the start reaches the set number. In the present embodiment, for the sake of simplicity, it is assumed that the start of the engine is completed when the ignition is performed once at the normal ignition timing after the start operation of the engine is started.
  • an ignition operation performed at the end of a compression stroke (including a certain period immediately after the piston passes the top dead center) that is performed once while the crankshaft rotates twice rotates the engine.
  • the ignition operation is performed every time the crankshaft makes one rotation. Therefore, the ignition operation is performed even at the end of the exhaust stroke, but the ignition operation performed in the exhaust stroke does not affect the operation of the engine.
  • FIG. 12 to FIG. 17 show flowcharts showing the algorithm of the program executed by the microcomputer to constitute the ignition control unit 10 in the present embodiment.
  • FIG. 12 shows an example of the main routine algorithm executed by the microcomputer. In the case of this algorithm, first, the microcomputer is powered on and reset in step S101, and the memory initialization process shown in FIG. 13 is performed in step S102.
  • step S201 a timer for measuring elapsed time is started in step S201, and the count value and flag of each timer other than the timer for timer in the microcomputer are reset in step S202.
  • step S203 the necessary memory is initialized, and in step S204, a drive signal is applied between the gate and emitter of the IGBT T1 constituting the current control switch so that the current control switch can be turned on.
  • step S205 the process returns to the main routine.
  • step S104 the watchdog timer provided in the microcomputer is cleared in step S103, and whether or not the engine has been started in step S104 (start start flag). Whether or not is set). If it is determined in step S104 that the engine has not been started (the start end flag has not been set), the process proceeds to step S105 to perform the start A / D process shown in FIG.
  • step S301 it is determined whether or not the detected value of the primary current input from the primary current detection unit 6 to the A / D input port of the microcomputer exceeds the peak value, and the primary current is detected. When the detected value does not exceed the peak value, it waits for the peak value to be exceeded.
  • step S301 the process proceeds to step S302, the drive signal applied to the gate of the IGBT T1 is set to zero, and the IGBT is turned off.
  • step S303 the start end flag is set. set. After setting the start / end flag, the process returns to the main routine in step S304.
  • step S103 After returning from the start A / D process to the main routine, the watchdog timer is cleared in step S103, and it is determined in step S104 whether the start end flag is set. At this time, since it is determined that the start / end flag is set, the process proceeds to step S106, and it is determined whether or not the calculation start flag is set. As a result, if it is determined that the calculation start flag is not set, the process returns to step S103. If it is determined in step S106 that the calculation start flag is set, the process proceeds to step S107, and an ignition timing calculation table used for calculation of the ignition timing is selected.
  • the ignition timing calculation table is a table that gives the relationship between the engine rotational speed and the ignition timing, and a plurality of tables that give various characteristics of the engine are experimentally created and stored in the ROM.
  • the ignition timing calculation table is searched for the engine rotational speed separately detected in step S108, the ignition timing at a rotational speed close to the detected rotational speed is read from the table, and interpolation calculation is performed on the read ignition timing. By applying, the ignition timing of the engine is calculated.
  • step S109 a timer set value (ignition timing measurement time) to be set in the ignition timer is calculated, and the process returns to step S103.
  • the ignition timing measurement time set in the ignition timer is the time for the ignition timer to measure from when the reference timing is detected until the ignition operation is performed.
  • the microcomputer also determines whether or not the detection value of the primary current I1 given from the primary current detector 6 has reached the threshold value Ith, and detects the timing at which the primary current reaches the threshold as the reference timing.
  • the process being executed is interrupted, and the reference timing interrupt process shown in FIG. 15 is executed.
  • the measurement value of the timer for timekeeping is read in step S401, and the reference timing is detected by calculating the difference between the measurement value of the timer read this time and the measurement of the timer read when the previous reference timing was detected.
  • the time indicating the cycle (the time from when the previous reference timing is detected until the current reference timing is detected) is measured as the cycle time, and the time measurement timer is restarted.
  • the engine speed is calculated from the period time (time required for one rotation of the crankshaft).
  • a timer set value is set in the timer X that measures the time for obtaining the timing to turn on the IGBT T1 next time.
  • This timer set value is set to such a value that the timer X completes the timing operation after the third half wave V3 of the AC voltage induced in the primary coil Wp disappears.
  • step S403 After setting the ignition timing measurement time in the timer in the microcomputer used as the ignition timer in step S403, the calculation start flag is set in step S404, and in step S405, an interrupt for shifting to the reference timing interrupt process is applied. Return to the process that was being executed.
  • the microcomputer also executes a timer X interrupt process shown in FIG. 16 when the measurement of the time when the timer X is set is completed.
  • a timer X interrupt process in step S501, a drive signal is given to the IGBT T1 so that the IGBT can be turned on, and the next reference timing interrupt is permitted. Then, in step S502, the timer X interrupt process is performed. Return to the process that was executed when moving to.
  • the microcomputer also executes the ignition timer interruption process shown in FIG. 17 when the measurement of the ignition timing measurement time when the ignition timer is set is completed (when the ignition timing calculated with respect to the rotation speed is detected).
  • this interrupt process after the ignition signal is performed by removing the drive signal given to the IGBT T1 in step S601 and turning off the IGBT, the process proceeds to this interrupt process in step S602. Return to the process that was being executed.
  • the switch driving means 11 is configured by step S204 of the memory initialization process of FIG. 13 and the timer X interrupt process of FIG.
  • the starting point fire control means 13 is configured by the starting A / D process shown in FIG. 14, and the normal point fire control means 14 is formed by the reference timing interruption process shown in FIG. 15 and the ignition timer interruption process shown in FIG. Is configured.
  • the rotation speed calculation means 14A is constituted by step S401 of the interrupt process of FIG. 15, and the normal point fire timing calculation means 14B is constituted by steps S107 and S108 of the main routine of FIG. Is done.
  • the normal point fire timing detection means 14C is configured by step S403 of the interrupt process in FIG. 15, and the switch-off means 14D is configured by the ignition timer interrupt process in FIG.
  • a drive signal is applied to the current control switch 2 until the second half-wave voltage V2 is induced in the primary coil Wp so that the current control switch can be turned on.
  • the switch driving means 11 is provided, the current control switch 2 is turned on without causing a large delay when the second half-wave voltage V2 is induced in the primary coil of the ignition coil when the engine is started. Since the current can flow, the time during which the primary current flows can be lengthened, and the ignition operation can be performed by cutting off the primary current during the period in which the primary coil Wp generates the second half-wave voltage. The proportion of the period that can be performed can be increased, and the variable range of the ignition timing of the engine can be widened.
  • the timing that can be used as the ignition timing at the start of the internal combustion engine is determined as the start timing fire timing from the waveform of the primary current detected by the primary current detector 6 at the start of the internal combustion engine,
  • the start point fire control means 13 is provided to perform the ignition operation by immediately turning off the current control switch 2 when the fire timing is obtained, when the engine is started, the crankshaft makes one rotation and the engine speed
  • the first ignition can be performed when the second half-wave voltage V2 is first induced in the primary coil Wp after the microcomputer is started up without waiting for the detection.
  • the first explosion of the engine can be carried out promptly and the engine can be reliably started, and the cranking of the engine can be sufficiently performed as in the case of starting the engine manually. Even if it is difficult to perform at a speed, the engine can be easily started.
  • the starting point fire control means 13 determines the ignition timing by monitoring the waveform of the primary current directly related to the magnitude of the ignition energy. By setting the initial ignition timing at a timing that can be used as the ignition timing at the start, and at a timing at which sufficient ignition energy can be obtained, the first explosion of the engine can be performed appropriately.
  • the reference timing detection means 12 for detecting the timing at which the primary current of the ignition coil reaches the threshold value as the reference timing is provided in the ignition control unit constituted by the microcomputer, and the reference timing detection means performs the reference. Since the rotational speed information of the engine is obtained from the cycle in which the timing is detected, it is not necessary to separately provide a circuit for generating a signal that gives information on the crank angle of the engine.
  • the ignition device can be configured simply by providing the number 5, and the configuration of the current interrupting ignition device can be remarkably simplified.
  • FIG. 4 shows the configuration of the second embodiment of the present invention.
  • the ignition coil IG includes an additional coil Wa that is connected in series to the primary coil Wp and induces a voltage in phase with the voltage induced in the primary coil. Is induced in the power supply circuit 5.
  • the power supply circuit 5 includes a voltage induced in the additional coil Wa when the first half-wave voltage V1 is induced in the primary coil Wp and an additional coil Wa when the third half-wave voltage V3 is induced in the primary coil Wp. It is configured to convert a voltage induced in DC into a DC voltage.
  • the connection point between the primary coil Wp and the additional coil Wa is grounded to the iron core of the stator of the magnet generator, and the terminal on the non-ground side of the additional coil Wa is the power circuit. 5 is connected to the input terminal on the non-ground side.
  • the power supply circuit 5 shown in FIG. 5 includes a diode D1 having an anode connected to the non-ground side terminal of the additional coil Wa, a capacitor C2 connected between the cathode of the diode D1 and the ground, and both ends of the capacitor C2.
  • the zener diode Zd is connected with the anode facing the ground side, and the voltage across the capacitor C2 is applied to the power supply terminal of the microcomputer MCU as the power supply voltage Vcc.
  • an additional coil Wa that is connected in series with the primary coil Wp and induces a voltage in phase with the voltage induced in the primary coil Wp is provided on the primary side of the ignition coil.
  • the power supply circuit 5 is configured to convert the voltage induced in the additional coil Wa when the first half-wave voltage and the third half-wave voltage are induced, the voltage is inverted to the power supply circuit 5. Since it is not necessary to provide a circuit, the configuration of the power supply circuit can be simplified, and the printed circuit board on which the electronic components constituting the power supply circuit 5 and the ignition control unit 10 are mounted can be reduced in size.
  • FIG. 6 the configuration of the third embodiment of the present invention is shown.
  • FIG. 11 shows waveforms of voltages and currents of respective parts of this embodiment.
  • the reference timing detection means 12 provided in the embodiment shown in FIGS. 1 and 4 is omitted, and instead, the voltage induced in the primary coil Wp of the ignition coil IG is waveform-shaped to perform internal combustion.
  • a crank signal generator 7 is provided for generating a crank signal including the crank angle information of the engine.
  • the crank signal generated by the crank signal generator is generated when the first half-wave voltage V1 of the AC voltage VL induced in the primary coil is generated, and when the first half-wave voltage V1 becomes zero (second The timing at which the half-wave voltage is generated), the timing at which the third half-wave voltage V3 is generated (the timing at which the second half-wave voltage V2 is zero), and the third half-wave voltage V3 is zero.
  • It is a rectangular wave signal indicating a level change that can be identified by timing, and the timing indicating each level change is a signal corresponding to a specific crank angle position of the crankshaft.
  • information on the rotational angle position of the crankshaft can be obtained from the crank signal, and a level change that occurs at a timing at which a specific level change of the crank signal is detected (for example, the timing at which the first half-wave voltage V1 is generated)
  • the engine speed information can be obtained from the period in which the engine is detected.
  • the microcomputer MCU configures the ignition control unit 10 by using the primary current information detected by the primary current detection unit 6 and the crank angle information given by the crank signal generated by the crank signal generation unit 7. To perform the necessary processing.
  • the hardware configuration of the ignition device according to the present embodiment is as shown in FIG.
  • the configurations of the current control switch 2, the primary current detector 6, the power supply circuit 5, and the microcomputer MCU are the same as the configurations of the power supply circuit 5 shown in FIG.
  • the crack signal generator 7 shown in FIG. 7 includes an NPN transistor Tr whose emitter is grounded and a collector connected to the interrupt input terminal INT of the microcomputer, and a non-ground terminal (power circuit) of the capacitor C2 of the power circuit 5.
  • a resistor R5 connected between the collector terminal of the transistor Tr and the resistor R6 connected between the non-grounded terminal of the capacitor C2 of the power supply circuit 5 and the base of the transistor Tr; Between the base of the transistor Tr and the ground, a diode D5 whose anode is connected to the ground side, a diode D6 whose cathode is connected to the non-ground end of the primary coil Wp of the ignition coil, and the base of the transistor Tr
  • One end of the resistor R7 is connected to the anode of the diode D6, and the other end is connected to both ends of the resistor R7. It is constituted by a capacitor C7.
  • a differential circuit is configured by the resistor R7 and the capacitor C7.
  • crank signal generation unit 7 of FIG. 7 After starting the engine starting operation, when the first half-wave voltage is induced in the primary coil of the ignition coil and the output voltage of the power supply circuit 5 is established, A predetermined base current is applied from the power supply circuit 5 to the transistor Tr through the resistor R6, and a collector voltage is applied from the power supply circuit 5 to the transistor Tr through the resistor R5, so that the transistor Tr is turned on. After the output voltage of the power supply circuit is established, the transistor Tr is kept on even when no voltage is induced in the primary coil.
  • the primary coil Wp of the ignition coil IG when the primary coil Wp of the ignition coil IG generates the negative first half-wave voltage V1 and the third half-wave voltage V3, the primary coil Wp ⁇ the diode D5 ⁇ the resistor R7 and the capacitor C7.
  • a current flows through the path of the differentiation circuit ⁇ diode D6 ⁇ primary coil W1, and a forward voltage drop occurs across the diode D5. This reduces the voltage between the base and the emitter of the transistor Tr, so that the transistor Tr is kept off. It is.
  • the crank signal input from the crank signal generator 7 shown in FIG. 7 to the interrupt terminal INT of the microcomputer has a waveform as shown in FIG. 11D, and when the engine is started, the output voltage of the power supply circuit is Timing t1 ′ at which the threshold is reached and timing t3 at which the third half-wave voltage V3 is generated rise from a low level to a high level, and the first half-wave voltage V1 becomes zero (second half-wave voltage). At a timing t4 when the second half-wave voltage V3 becomes zero, and a rectangular wave signal that falls from a high level to a low level.
  • the low level is changed to the high level at the timing t1 when the first half-wave voltage V1 is generated and at the timing t3 when the third half-wave voltage V3 is generated.
  • the signal becomes a rectangular wave signal that falls from a high level to a low level.
  • the low-level to high level generated at the timing t1 when the first half-wave voltage V1 is generated (timing t1 ′ when the output voltage of the power supply circuit reaches the threshold when the engine is started). Causing the microcomputer to recognize the rise to the level and the fall from the high level to the low level that occurs at the timing t2 when the first half-wave voltage V1 becomes zero and the second half-wave voltage V2 is generated.
  • crank angle position information of the engine corresponding to the timings t1 and t2 can be given to the microcomputer, and the period in which the level change of the crank signal generated at the timing t1 is detected (the time required for one rotation of the crankshaft) ) To determine the engine speed.
  • the rotational speed of the engine can be obtained from the cycle in which the level change of the crank signal that occurs at timing t2 is detected.
  • the level of the crank signal also changes at the timing t3 when the third half-wave voltage V3 is generated (timing when the second half-wave voltage V2 becomes zero) t3 and the timing t4 when the third half-wave voltage V3 becomes zero.
  • the ignition coil primary current is cut off and the ignition operation is performed, the voltage waveform at both ends of the primary coil is greatly disturbed around the timing t3 and t4, and accordingly, the waveform of the crank signal is also disturbed. It is difficult to accurately obtain engine rotation information from changes in the level of the crank signal at timings t3 and t4.
  • the main routine of the program executed by the microcomputer MCU is the same as that shown in FIG. 12, and the memory initialization process is the same as that shown in FIG.
  • the start A / D process is the same as that shown in FIG. 14, and the ignition timer interrupt process is the same as that shown in FIG.
  • an INT input interrupt process shown in FIG. 18 is executed. Since the process for turning on the IGBT T1 is performed in the process of FIG. 18, the timer interrupt process shown in FIG. 16 is not executed.
  • the INT input interruption process shown in FIG. 18 is performed from the crank signal generator 7 to the microcomputer at the timing t1 (timing t1 ′ at which the output voltage of the power supply circuit reaches the threshold when the engine is started) shown in FIG. This is executed when a level change from a low level to a high level is applied to the INT terminal of the MCU.
  • the measured value of the timer for timekeeping is read in step S401 ′, and the measured value read this time and the measured value read in step S01 ′ of the interrupt process at the time of INT input performed previously (before one rotation of the crankshaft) Is detected as a cycle time.
  • the engine speed is calculated from this cycle time, and the timer is restarted.
  • step S402 ' a drive signal is given from the port A of the microcomputer to the gate of the IGBT T1 so that the IGBT T1 can be turned on, and interrupt processing at the next INT input is permitted.
  • the calculation start flag is set in step S404 ′, and then the processing executed when the routine proceeds to the interrupt processing at the time of INT input in step S405 ′.
  • the start time fire control means 13 and the normal time fire control means 14 are configured by the INT input time interruption process shown in FIG.
  • the other configuration of the present embodiment is the same as that of the first embodiment shown in FIG. 1, and the engine rotation speed is calculated from the crank signal generation interval instead of detecting the engine rotation speed from the reference timing detection period.
  • the operation similar to that of the first embodiment is performed except that the microcomputer starts to measure the ignition timing when the microcomputer recognizes the change in the level of the crank signal generated at the timing t1 when the first half wave is generated. .
  • the interrupt processing at the time of INT input is executed when the microcomputer recognizes the crank signal level change at the timing t1, but the INT input is executed when the microcomputer recognizes the crank signal level change at the timing t2. It can also be configured to execute hourly interrupt processing. In other words, it is possible to perform a process for turning on the IGBT at timing t2 and to calculate the rotational speed of the engine and to start measuring the ignition timing.
  • FIG. 8 shows the overall configuration of the fourth embodiment
  • FIG. 9 shows the hardware configuration used in the embodiment.
  • the ignition coil IG is connected in series to the primary coil Wp, and the additional coil Wa that induces a voltage having the same phase as the voltage induced in the primary coil is used as the primary coil Wa.
  • the power supply circuit 5 induces a voltage induced in the additional coil Wa when the first half-wave voltage V1 is induced in the primary coil Wp and a third half-wave voltage V3 in the primary coil Wp. In this case, the voltage induced in the additional coil Wa is converted into a DC voltage.
  • the power supply circuit 5 shown in FIG. 9 is configured similarly to the power supply circuit 5 (see FIG. 5) used in the second embodiment. 9 includes an NPN transistor Tr whose emitter is grounded and whose collector is connected to the interrupt input terminal INT of the microcomputer, and a non-ground side terminal (power source) of the capacitor C2 of the power circuit 5.
  • the resistor R5 connected between the collector of the transistor Tr, the resistor R8 connected between the base emitter of the transistor Tr, and the anode connected to the non-grounded terminal of the additional coil Wa.
  • a differential circuit composed of a parallel circuit of a resistor R7 and a capacitor C7 connected between the cathode of the diode D6 and the base of the transistor Tr.
  • the crank signal input from the crank signal generation unit 7 shown in FIG. 9 to the interrupt terminal INT of the microcomputer is the timing t1 (when the first half-wave voltage V1 of the AC voltage VL induced in the primary coil is generated. High level at the timing t3 ′ when the output voltage of the power supply circuit 5 reaches the threshold when the engine is started and the timing when the third half-wave voltage V3 is generated (the timing when the second half-wave voltage V2 becomes zero) t3. At a timing when the first half-wave voltage V1 falls to zero (timing when the second half-wave voltage is generated) t2 and at a timing t4 when the third half-wave voltage V3 becomes zero. It becomes a rectangular wave signal that rises from a low level to a high level.
  • the waveform of the crank signal is a waveform obtained by inverting the waveform of the crank signal shown in FIG.
  • a level change from a high level to a low level of the crank signal generated at timing t1 (or t1 ′) or a level change from a low level to a high level of the crank signal generated at timing t2 is transmitted to the microcomputer.
  • the starting time fire control means and the normal time fire control means 14 can be configured.
  • the waveforms of the magnetic flux ⁇ interlinked with the primary coil, the voltage VL induced in the primary coil, and the primary current I1 are schematically illustrated by approximating them with triangular waveforms.
  • the actual waveform of the magnetic flux ⁇ interlinked with the voltage VL, the voltage VL induced in the primary coil, and the primary current I1 is a waveform close to a sine wave.
  • the starting point fire control means is configured to obtain the timing at which the primary current detected by the primary current detecting unit reaches the peak value as the starting point fire timing.
  • the starting point fire control means may be configured to obtain the timing when the primary current drops to a set level after passing the peak value as the starting point fire timing.
  • the primary induced voltage limiting means is configured such that, for example, a voltage induced in the primary coil Wp when the IGBT is turned off by connecting a Zener diode with the cathode facing the collector side of the IGBT between the collector and gate of the IGBT. It may be realized by configuring a circuit that keeps the IGBT in an on state until it falls below the set level.
  • the semiconductor switch that constitutes the current control switch 2 has an active clamp characteristic (the voltage at both ends is constant) It may be realized by using an IGBT having a function limited to the following, a bipolar transistor, or the like.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Electrical Control Of Ignition Timing (AREA)

Abstract

　L'invention concerne un dispositif d'allumage pour un moteur à combustion interne dont la capacité de mise en marche est améliorée, ledit dispositif d'allumage ayant un détecteur de courant primaire servant à détecter un courant primaire d'une bobine d'allumage, un moyen destiné à détecter, en tant que moment de référence, le moment auquel la valeur détectée du courant primaire atteint un seuil, un moyen de commande de commutateur destiné à mettre un commutateur de commande de courant, qui commande l'allumage et l'extinction du courant primaire de la bobine d'allumage, dans un état dans lequel ledit commutateur de commande de courant peut être allumé lorsqu'une source d'alimentation d'un micro-ordinateur est établie ou lorsque le moment de référence est détecté après le début d'une opération de démarrage du moteur, et un moyen de commande d'allumage de démarrage servant à détecter un moment qui peut être utilisé en tant que période d'allumage pendant le démarrage du moteur à l'aide de la forme d'onde du courant primaire lorsque le moteur démarre, et à réaliser une opération d'allumage en éteignant le commutateur de commande de courant au moment détecté.
PCT/JP2014/067363 2014-06-30 2014-06-30 Dispositif d'allumage pour un moteur à combustion interne Ceased WO2016001968A1 (fr)

Priority Applications (3)

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CN201480080332.3A CN107076096B (zh) 2014-06-30 2014-06-30 内燃机用点火装置
PCT/JP2014/067363 WO2016001968A1 (fr) 2014-06-30 2014-06-30 Dispositif d'allumage pour un moteur à combustion interne
JP2016530693A JP6412572B2 (ja) 2014-06-30 2014-06-30 内燃機関用点火装置

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PCT/JP2014/067363 WO2016001968A1 (fr) 2014-06-30 2014-06-30 Dispositif d'allumage pour un moteur à combustion interne

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JP2019218920A (ja) * 2018-06-21 2019-12-26 東洋電装株式会社 点火装置
US10995726B2 (en) 2018-03-29 2021-05-04 Woodward, Inc. Current profile optimization

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JPH0552168A (ja) * 1991-08-22 1993-03-02 Kokusan Denki Co Ltd コンデンサ放電式内燃機関用点火装置
JP2006249946A (ja) * 2005-03-08 2006-09-21 Iida Denki Kogyo Kk 内燃機関用点火装置の下限速度域における点火動作制御方法と点火時点制御装置。
JP2008045458A (ja) * 2006-08-11 2008-02-28 Kokusan Denki Co Ltd コンデンサ放電式エンジン用点火装置
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JP2002174163A (ja) * 2000-12-06 2002-06-21 Denso Corp 内燃機関用点火制御装置
JP4978915B2 (ja) * 2009-02-09 2012-07-18 飯田電機工業株式会社 内燃機関用点火装置の点火時点制御装置
EP2982857A4 (fr) * 2013-04-03 2017-04-26 Kokusan Denki Co., Ltd. Dispositif d'allumage de moteur à combustion interne

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JPH0552168A (ja) * 1991-08-22 1993-03-02 Kokusan Denki Co Ltd コンデンサ放電式内燃機関用点火装置
JP2006249946A (ja) * 2005-03-08 2006-09-21 Iida Denki Kogyo Kk 内燃機関用点火装置の下限速度域における点火動作制御方法と点火時点制御装置。
JP2008045458A (ja) * 2006-08-11 2008-02-28 Kokusan Denki Co Ltd コンデンサ放電式エンジン用点火装置
JP2008231984A (ja) * 2007-03-19 2008-10-02 Kokusan Denki Co Ltd 内燃機関用点火装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10995726B2 (en) 2018-03-29 2021-05-04 Woodward, Inc. Current profile optimization
JP2019218920A (ja) * 2018-06-21 2019-12-26 東洋電装株式会社 点火装置
JP7144981B2 (ja) 2018-06-21 2022-09-30 東洋電装株式会社 点火装置

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JP6412572B2 (ja) 2018-10-24
JPWO2016001968A1 (ja) 2017-05-25
CN107076096A (zh) 2017-08-18
CN107076096B (zh) 2019-06-07

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