DE2306007A1 - FUEL SUPPLY CONTROL DEVICE FOR COMBUSTION ENGINE - Google Patents

Description

Patent attorneys

Dlp! .-! Nq. R.BEETZ senior

Dipi-in ^. κ. la: - :. '> - "CHT

Dr.-In ^ i. R. U -. Il f 2 jr.

Münclian 22, Siiinsdorfetr. 10 _ - _ _ _ _n _

2305007

81-20.14OP (2O.141H). 7.2.1973

HITACHI. LTD .. Tokyo (Japan)

Fuel supply control device for internal combustion engine

The invention relates to a control device for the fuel supply of an internal combustion engine, and in particular the sensitivity of a solenoid valve to control the amount of fuel in a Control device is used for the fuel supply. The fuel supply control device may have the Control the amount of fuel with a high degree of accuracy.

There are two different types of control valves for a fuel supply control device Internal combustion engine has been discussed in which a fuel injector nozzle for opening in an intake line of the Internal combustion engine is provided so that the machine with

81- (POS 297 ^ 2) -Ko-r (9)

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the desired amount of fuel through the controlled opening time of the control shut-off device is fed. One of the two types of control shut-off devices is mechanical and the other controlled electromagnetically.

Recently, there has been a fuel supply control device with the last-mentioned type of controlled shut-off device, in particular with a solenoid valve, opposite of the first-mentioned type is preferred because on the one hand it easily detects different control factors and the too controlling amount can be easily determined and, on the other hand, the control parts including semiconductor devices and the like have been improved.

The main difficulty »which the accuracy of the control in a fuel supply control device a solenoid valve, is a delay in the response sensitivity when opening and closing of the solenoid valves among other malfunctions, which on different Errors can be based, such as errors in the recording of various control factors, errors in the calculation and a deviation in the fuel supply pressure and the like.

The opening time of a fuel injection valve that is used in an internal combustion engine as a fuel supply device is used is so determined that an appropriate amount of fuel in the machine accordingly the speed and the load is fed in.

However, since the speed of an internal combustion engine varied over a wide range from approximately 600 rpm up to 6000 rpm, an unsuitable amount of the into the

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Machine fed fuel to a reduction in the efficiency of the machine. This is special because of the harmful effect of the discharged gas is undesirable. In practice, however, there is a delay in opening and closing a solenoid valve, that is used as a fuel injector when the engine runs at a high speed, with the result that the amount of fuel fed in is too inaccurate tends.

It is the object of the present invention to improve responsiveness when opening and closing a solenoid valve for a fuel supply control device to improve the accuracy of the fuel supply control to improve and adapt the control device to a high speed of the machine to be able to.

The fuel supply control device according to the invention for an internal combustion engine or an internal combustion engine is characterized by a normally closed fuel supply shut-off element for controlling the amount of fuel that is fed into the engine according to the opening time of the shut-off element, and a device for electromagnetic control of the opening and closing of the shut-off element in In such a way that this device is energized on the one hand to generate a first electromagnetic attraction force which is great enough to open the shut-off device from its closed state, on the other hand it is energized to generate a second electromagnetic attraction force which is great enough is to open the shut-off valve

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State to hold after the shut-off device has been opened once, and on the other hand-is finally excited to a opposite magnetic flux - to generate, thereby quenching the induced magnetic flux that prevents that the second electromagnetic attraction disappears, when the shut-off device is closed from its open state. -

The invention is explained in more detail below with reference to the drawing. Show it %

1 shows an electrical circuit for controlling a solenoid valve;

Fig. 2 shows a fuel supply amount characteristic curve;

3 shows an electrical circuit of an exemplary embodiment the present. Invention;

FIG. K shows diagrams to explain the operating state of the electrical circuit shown in FIG. 3; FIG.

Fig. 5 »8, 9 and TO electrical circuits of others Embodiments of the present invention;

6 shows a diagram to explain the operating state the respective electrical circuit shown in Figures 5, 8, 9 and 10;

7 shows a characteristic curve for explaining the mode of operation the device according to the invention when opening and closing the shut-off device;

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11 shows an electrical circuit of another embodiment of the present invention;

FIG. 12 is a diagram for explaining the operating state of the electrical circuit shown in FIG. 11;

13 shows a section through a solenoid valve according to the invention, and

FIG. 4 shows a plan view of the solenoid valve shown in FIG.

Xn of Fig. 1 consists of a series circuit of a magnet coil 2 and a resistor 3 »with the collector-emitter path of a transistor ^ between a terminal 1 of an electrical power source and earth, and the base electrode of the transistor 5 via a resistor 6 with a control signal input 7 is connected, while a capacitor k is provided in parallel with the resistor 3.

In this circuit, the internal resistance between the collector and emitter electrodes of the transistor 5 is through the feeding of a bias voltage into the base electrode of the transistor 5 is controlled by the control signal input 7, so that the opening and closing of a solenoid valve for controlling the amount of fuel supplied can be controlled.

Since the capacitor 4 is in parallel with the current limiting resistor 3, the electromagnetic coil x 2 is energized to open the solenoid valve by a large one, through the coil 2 and the capacitor k for a quick period of time

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to open flowing current when the valve is opened. After the capacitor k has been charged, the coil 2 is excited by a current which is large enough to maintain the open state of the valve and which is referred to below as the holding current.

Even if the holding current is switched off from coil 2 is used to close the valve, the valve is not immediately fully closed. This is the case since induces a back emf in the electromagnetic coil when the holding current is switched off from the coil, and there at the same time an eddy current in the magnetic material is induced, which forms a magnetic circuit for the solenoid valve so that the magnetic flux passing through the Holding current induced does not disappear. The back emf and eddy current become gradual over time reduced so that the magnetic attraction force of the valve, the disappearance of which was prevented by the back EMF and the eddy current, also step by step accordingly the reduction of the back EMF and the eddy current with the Time is reduced.

As a result, the valve will be fully open State held until the electromagnetic attraction force on the closing force of the valve is reduced, the generally generated by a spring or the like is. Then the degree for preventing the valve from closing is gradually decreased to the solenoid valve to be closed completely.

Changed the time required to close the valve related to the size of the spring force

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to close the valve and the inertia of the moving Parts of the valve, etc.

The embodiment shown in Fig. 1 improves the responsiveness in valve opening by a sufficiently large current flows through the electromagnetic coil when the valve is opened from the closed state, and the responsiveness in closing the valve by generating the above Back EMF and the Virbelstromβ is reduced as much as possible when the valve is closed from its open state. The above-mentioned back EMF and eddy current can be prevented to some extent from induction by holding the valve in its open state with a reduced holding current.

Xn Fig. 2 characteristic curves are shown, the Besieung between the amount of fuel supplied by one injection and the time required for the solenoid valve to open. A curve A represents an ideal one State of the device that does not have a delay time in response during opening and closing of the valve having. A curve B shows a practical state with a delay time.

When a fuel supply control device having such an ideal characteristic, as indicated by the curve A, then the solenoid valve can be immediately completely dependent on a command signal to open the valve with a high responsiveness opened and immediately closed when the Befehlβ deleted signal is even if the command time is very short

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is. As a result, the relationship between the Command time and the amount of fuel supplied for a Linear fuel injection.

On the other hand, in the practical condition indicated by curve B, the solenoid valve cannot be opened at all if the command time for opening the valve is very short. Even if the command time increases somewhat, the command signal can be cleared to close the solenoid valve before it is fully open. Therefore, the relationship between the fuel supply amount from one injection and the command time does not change linearly. The solenoid valve may be fully opened * when the command time further zunimmtο the other hand, the valve can be kept in its open state, ^ hen the command signal is cleared, while the response of the closing bit is slow, whereby the fuel supply amount with respect to a case increases more, in which this response sensitivity is high depending on the same command time to open the valve . . "... '■■■■

In a fuel supply control device with a solenoid valve., which has the characteristic curve shown by curve A in Fig. 2, it is relatively easy to a desired fuel supply amount between the necessary minimum value Q1 and the necessary maximum value Q2 in the period for controlling the fuel supply amount between the minimum value T1 and the maximum value 1-

i worth t2 to control what's on the linear relationship between the command time and fuel supply mexige for one Fuel injection based Furthermore, it is possible

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making the maximum value Q2 large while the maximum value T2 remains unchanged, or to make the maximum value T2 small while the maximum value Q2 remains unchanged, or make the maximum values Q2 and T2 large and small, respectively, by increasing the fuel supply pressure at the same time increases or the mechanical size of the fuel measuring member of the device is enlarged, etc.

On the other hand, is in a fuel supply control device with a solenoid valve which has the characteristic curve shown in FIG. 2 by curve B, which is used for Opening of the solenoid valve according to the required minimum value Q1 required command time in a non-linear Part of the characteristic curve B, which complicates the control device and reduces the accuracy of the control. It is actually possible to make the maximum value Q2 large while the maximum value T2 remains unchanged, or the maximum value Making T2 small while keeping the maximum value Q2 unchanged, or the maximum values Q2 and T2, respectively to make it large and small at the same time, as described above, by specifically reducing the fuel supply pressure increases or the mechanical size of the fuel gauge of the device is increased, etc. However, even if the above requirement is met by increasing the fuel supply amount in the unit time until close to the maximum value Q2 can be met, then the non-linear part increases in the vicinity of the minimum value Q1 with the result that the accuracy of control is greatly reduced or that it is sometimes impossible is to carry out the control.

To solve this problem * it is necessary to have the

ι 'It

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-.10 -

Improve responsiveness when closing the valve, by paying attention to it as much as the improvement in opening responsiveness of the valve »

In Fig. 3 is a circuit of an embodiment This circuit illustrated in the present invention improves the responsiveness of opening and closing of the valve. The circuit shown in Fig. 1, which especially the responsiveness when opening d © s Improved valve, can by the circuit according to the invention 3 are replaced, so that the Änsprechensensitivity when closing as well as when opening the valve is improved can be.

In the circuit shown in FIG. 3, a series circuit of respective collector-emitter paths of transistors 5B and 5D is connected between a terminal 1 of an electrical power source and earth. The transistor 5B is provided in order to additionally control the opening current of the valve, which generates a necessary electromagnetic force for opening the valve from its! closed state generated. The direction of the current flowing through the electromagnetic coil, which generates the above-mentioned electromagnetic force, is hereinafter referred to as the forward direction. This current is therefore called the forward or forward current. The transistor 5G- is used to control the reverse or reverse current ₉ which flows through the coil 2. Furthermore, there is another circuit from the collector-emitter path © ines transistor 5C, from a resistor 3 which limits a current and from the collector-emitter path of a transistor 5A between

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see the terminal T of an electrical power source and Ground, with transistors 5C and 5A each for one additional control of the blocking flow and the valve opening flow be used. A capacitor 4 is parallel to the resistor 3 · an electromagnetic coil 2 lies between the collector electrodes of the transistors 5B and 5C, respectively. The base electrodes of transistors 5A, 5B, 5C and 5D are each connected to the control signal inputs 7A, 7B, 7C and 7D via resistors 6A, OB, 6C and 6e.

In Fig. 4 the operating state of the circuit shown in Fig. 3 is shown. The transistors 5A and 5B are controlled in accordance with the waveform shown in Fig. 4a. The transistors 5C and 5D _ are controlled in accordance with the waveform shown in Fig. 4b. If with this control the valve is opened, then both transistors 5A and 5B conductive so that a large current flows through the electromagnetic coil 2 to start the solenoid valve for to operate an opening and the current gradually decreases until it becomes a constant value. If the required The valve opening time has passed, then transistors 5B and 5A and 'transistors 5C and 5D each made non-conductive and conductive. Then the transistors 5C and 5D turn on again after a given time not made conductive.

Accordingly, a current as shown in Fig. 4c flows through the electromagnetic coil when the Transient behavior of the current is neglected. In particular, when the solenoid valve is opened, then flows

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a current from terminal 1 via the emitter-collector path of transistor 5B, the electromagnetic coil-2, which consists of the current limiting resistor 3 and the capacitor 4 existing parallel connection and the collector-emitter path of the transistor 5A to earth «In the parallel connection of the resistor 3 and the capacitor 4, the through the capacitor 4 actually with the current flowing Time gradually to "zero" while at the beginning of the Opening the valve is very large.

On the other hand, if the solenoid valve is closed, then the current control transistors 5A and 5B are not conductive, to prevent the forward current from flowing through the electromagnetic coil 2. At the same time, the Reverse current auxiliary control transistor 5C and the forward current control transistor 5D conductive to reverse current from terminal .1 to earth through transistor 5C, the electromagnetic To conduct coil 2 and transistor 5ö * Since the reverse current through coil 2 is opposite to the forward current Direction flows that flows during the opening of the valve, the reverse current is used to reduce the by turning off the forward current for maintaining the open state of the valve induced EMF and the eddy current induced in this way in order to prevent the flow based on the forward current from disappearing when the forward current is switched off « Accordingly, the electromagnetic attractive force of the Valves are turned off quickly to immediately and completely close the valve, with the result that the responsiveness when closing the valve is considerable is improved. The solenoid valve is controlled so that it is shown in accordance with the Fig. 4d dargestell-

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th signal form is open or closed, whereby the responsiveness when opening and closing the valve is neglected.

Referring to Fig. 5, there is shown an electrical circuit of an embodiment of the present invention. There is a series connection of the emitter-collector path of a forward current auxiliary control transistor 3B and the collector-emitter path of a blocking current control transistor 5D between a connection 1 of an electrical power source and earth, and another series connection of the emitter-collector The path of a blocking current auxiliary transistor 5C and the collector-emitter path of a forward current control transistor 5A are also connected between terminal 1 and ground. An electromagnetic coil 2 is located between the connection point of the two collector electrodes of the translators 5B and 5D and the connection point of the two collector electrodes of the translators 5A and 5C. It is a further another series circuit of a holding current Begrenzungawideratand 3 and the collector-emitter path of a · holding current Steuertrarisistors 5E with the collector-emitter path dea Tranaiatora 5A ₁ and the base electrodes of the translators 5A _f 5B, 5C, 5D and 5E aind parallel each connected via resistors 6a, OB, 6c, 6d and 6E to SignalelngXngen 7A, 7B, 7C, 7D and 7E.

In FIG. 6 the operating status of the circuit shown in FIG. 5 is shown. Ώ * τ Durohlafiatrom-Hilfaateuer · translator 5E, the Halteatrom-Steuerertranaiator 5E _f the Ventlluffnunga-Steuerertranaiator 5A, the Sperratrom-Hilfaateuertranaiator 5C and the Sperratrom-Steuerertransaiator 50 j «Weila in correspondence with the in Fig. 6a, 6b 6e and 6e shown sigma sequences activated.

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Since only the forward current auxiliary control transistor 5B and the Haltestrora-Steuartransietor 5 $ are conductive at the beginning, a current flows from the terminal 1 of the result Current source via the forward current auxiliary control transistor 5B, dia electromagnetic coil 2, the holding current limitation resistor 3 and the holding current control transistor 5E to earth. This current creates an «electromagnetic force which the The valve cannot open from its closed state, but can only maintain the open state if that Valve is open.

Then the valve opening control transistor 5A is made conductive so that a large forward current through the through

Lassstrom-auxiliary control translator 5B, the electromagnetic Coil 2 and the valve opening control transistor 5A flows. Therefore, it is not always necessary for the holding current control transistor 5E to be conductive during this time. The valve opening control transistor 5A is controlled so that it is conductive for a desired time and then again non-conductive.

When the solenoid valve is closed from its open state, the forward current auxiliary control transistor 5B, the holding current control transistor 5S and the * Valve opening control transistor 5A, wherein in most cases the transistor 5A is already non-conductive at this time, made non-conductive while at the same time the locking current-Hllf se expensive door to the Is tor 56 and the locking current- ' Control transistor 5D made conductive and in the conductive state be held for a desired time. As a result flows a. Current backward from connection 1 of the electrical power source Via the locking current auxiliary control translator 3C, which,

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Reverse current control transistor 5E and the electromagnetic Coil 2 to earth.

- Xn Fig. 6d the waveform of the current flowing through the electromagnetic coil 2 is shown. The transient processes of the current are due to the signal form the inductance of the electromagnetic coil and the like neglected. 6 shows the open and closed states of the solenoid valve, the responsiveness of the valve also being neglected is. In this way, the same effect on the control is achieved, as explained in more detail above with reference to FIG. 3 became.

Referring to Fig. 7, the operation of the invention is shown Control device shown in comparison to the control device already discussed. Curves A and B each show the response sensitivities when the valve closes when the solenoid valve is in each case through the one shown in FIG and 3 control circuits shown is controlled. In addition, when closing, the movable member of the valve collides with its fixed valve body and resiliently is repeatedly flush with the valve several times in the same way as when it was opened. The size and the number of stops can be reduced to a certain extent. The size and duration of the blocking stream can be selected appropriately.

8 shows an electrical circuit of another exemplary embodiment of the invention, in which an electromagnetic coil 12A for holding the open state of a solenoid valve, a holding current limiting resistor 3

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and a holding current control transistor 15E in series between the terminal 1 of an electrical power source and ground. Furthermore, there is a series circuit consisting of a valve opening auxiliary Control transistor 15B, an electromagnetic Coil T2B for opening the solenoid valve / and from a valve opening control transistor 15A also between connection 1 and earth. Transistors 15C and 15D are connected in each case in parallel to the series connection of the electromagnetic coil 12B and the transistor 15B and to the series connection of the electromagnetic coil 12B and the transistor 15A. The base electrodes of the transistors 15A, 15B, 15C, 15D and 15E are each through resistors; i6a, i6b, IOD, IOD and i6E with control signal inputs 17A, 1? B, 17C, 17D and 17E connected.

The holding current control transistor 15E _t, the valve opening control transistor 15A and the valve opening auxiliary control transistor 15B are each controlled to operate in accordance with the waveforms shown in Figs. 6a, 6b and 6c. The circuit is constructed so that the electromagnetic attraction force due to the current flowing through the electromagnetic coils 12B additionally cooperates with the electromagnetic attraction force due to the holding current flowing through the electromagnetic coil 12A. Furthermore, the reverse current assist control transistor 15C and the reverse current control transistor 15D are both controlled to operate in accordance with the waveform shown in Fig. 6c. The circuit thus constructed shows the same operation in the control as the circuit shown in FIG.

In the circuit shown in FIG

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a series circuit of an electromagnetic coil 22A for valve opening control and a valve opening control transistor 25A; and another series circuit of an electromagnetic coil 22B for reverse flow control and a reverse flow control transistor 25B in parallel between a terminal 1 of an electric power source and the ground. A series circuit comprising a holding current limiting resistor 3 and a holding current control transistor 25c is also in parallel with the collector-emitter path of transistor 25A. The base electrodes of the transistors 25A ₁ 25B and 25C are respectively connected through resistors 26a, 26b, 26c to the control signal inputs.

The holding current control transistor 25C, the valve opening control transistor 25A and the reverse flow control transistor 25B are each controlled to operate in accordance with the waveforms shown in Figs. 6a, 6b and 6c. The coils are arranged in the apparatus so that the magnetic flux generated by the current flowing through a ± e electromagnetic coil 22B during conduction of transistor 25B cancels the magnetic flux generated by turning off the current generated during conduction of the Transistor 25A and / or transistor 25C flows through the electromagnetic coil 22A, whereby the same effect on the control as in the circuit shown in FIG. 5 is obtained.

In the circuit shown in FIG a series circuit of a holding electromagnetic coil 32A, a holding current limiting transistor 3, and a Holding current control transistor 35A, another series * chal-

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device from an electromagnetic coil 32B for valve opening and a valve opening control transistor 35B, and yet another series connection of an electromagnetic coil 32C for reverse flux control and a reverse flux control transistor 35C in parallel between the terminal 1 an electric power source and ground, while the base electrodes of the transistors 35A, 35B and 35C are resistors 36a, 36B and 36c each with control signal inputs 37A, 37B and 37C are connected. When the electrical and magnetic properties of the coil 32A are appropriately selected the holding current limiting resistor 3 can be omitted.

The holding current control transistor 35A, the valve opening control transistor 35B and reverse flow control transistor Qr 35C are each controlled to be in accordance with the waveforms shown in Figures 6a, 6b and 6c operate. The coils are arranged so that the respective magnetic fluxes generated by the currents flowing through the electromagnetic coils 32A and 32B, additionally cooperate with each other, and that the through the current flowing through the electromagnetic coil 320 generated magnetic flux both previously generated magnetic Wiping out rivers, causing the same effect on the Control is obtained as explained above with reference to FIG.

Let it be assumed that b © ± that in FIG. 10 The circuit shown is the holding® © lektromaga®t ± cal coil 32A, the holding current limiting resistor 3 and the holding current control transistor 35A are omitted that the valve opening transistor 35B and the Sperrfluss Steiaartraiisi-

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sturgeon 35c are each controlled so that they are in accordance with d6n in FIGS. 4a and 4b shown waveforms work, and that the electromagnetic coils are arranged so that the magnetic flux flowing through the the electromagnetic coil 32C is generated current flowing, cancels the magnetic flux flowing through current flowing through the coil 32B is generated. Then the the same effect on the control can be obtained, as was explained in more detail above with reference to FIG. 3.

In Fig. 11 is an electrical circuit for an inventive Control device is shown, which is suitable for a high speed fuel supply.

11 shows a series circuit of transistors 4-5B and 45D and another series connection of transistors 45c and 45A in parallel between a terminal 1 one electrical power source and ground, with an electromagnetic coil 42A for controlling valve opening and valve closing between the connection point of the two collector electrodes of the transistors 45A and 45C and the connection point of the two collector electrodes of the transistors 45B and 45D is provided, and being a series circuit from a resistor 3 and a holding current control coil 42B parallel to the emitter-collector path of the transistor 45B is provided. Furthermore, the coils are arranged so that the MMK, which is based on the current flowing from terminal 1 via the resistor 3, the holding current control coil 42B and the transistor 45D flows to the ground, and the MMK which is applied to the Current based on the from terminal 1 through the transistor 45C, the control coil 42A for valve opening and valve closing and the transistor 45D flows to the ground, in addition to each other cooperate.

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η r> Π C Π Π ^ ■ α ο U ο UU /

If, in the thus constituted circuit, the transistors 45A * 45B, 45c and 45D are each controlled so as to operate in accordance with those shown in Figs. 12c, 12c _t 12b and 12a illustrated waveforms by the required in the respective base electrodes of transistors Control signals are fed in via the resistors 46A, 46B, 46C and 46D from the control signal inputs 47A, 47B, 4? C and 4? D, then the circuit generates an HMI in accordance with the signal shown in FIG Therefore, the same effect on the control as shown in Fig. 6d can be obtained, and the solenoid valve is controlled to operate in accordance with the waveform shown in Fig. 12i.

The circuit according to the invention has the advantage that no large current through the holding current control coil 42B must flow because the coil 42B is not so steep in the rise characteristic of the current needs to be, so that the number of turns in the coil can increase sharply by a thin conductive wire is used.

If furthermore the coil material or the number of changes in the coil are appropriately selected »then resistor 3 can be omitted *

Furthermore, this control device requires Holding current control coil 42B no special control component in the circuit * In FIG into the opening of a core 121 via a suitable connecting line fed and then through respective hollow parts of an adjuster 124, a valve needle 133 and a side

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ORJGfNAL

Union opening of the needle 133 to a valve seat made of a nozzle 134 and the valve needle 133 out. In addition, the Fuel can reach the valve seat via the outer edge of the valve needle 133. An actuator or phaser 131 is in the drawing by an electromagnetic Force pulled up so that the valve seat is open to feed the fuel.

The magnetic circuit of this device consists of the core 121, a yoke 128, the valve needle 133 and the Actuator 131. An electromagnetic coil is common wound around a bobbin together in one piece, around a magnetic field in an ordinary Generate fuel injector. On the other hand, in the present invention, there is an electromagnetic coil 127A is wound on the inside or outside of a bobbin 126 to hold the valve open and then insulated with an insulating material. After isolating the coil 127A, another is electromagnetic Coil 127B to control opening and Closing the valve wrapped outside or inside the isolator 129. Accordingly, each of the coils 127A and 127B independently generate a magnetic field.

The number of turns of the holding coil 127A can be increased so that the required current flowing therethrough decreases. The rise characteristic during the transient process of the current flowing through the control coil 127B for opening and Closing the valve flow can be improved by using a relatively thick wire as the winding material and the number of turns is reduced. Depending on the design of a control circuit, each of the two

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¹ AiAL. JNSPECTED

the terminals of the respective coils 127A and T27B can be used together as one terminal, so that the four terminals of the two coils are connected to three terminals 123A, 123B
and 123c can be reduced, as shown in Fig. 1h , to thereby enable simplification of the wiring in the device,

One of the main features of the fuel injection according to the invention is the setting of the responsiveness of the injection valve. The adjustment of the sensitivity of the valve is carried out by the
Counterforce of a spring is set in such an injection valve. One method of adjusting the counterforce of a spring is to screw an adjuster into a core to depress the spring and then adjust it appropriately after the injector is assembled, with the outer edge pryed against the outside of the core.

However, this method has the disadvantage that the set state is disturbed by taking up a thread of the screw or the like when a screw or
Mortising force acts because the accuracy of a screw in
general is limited.

According to the present invention, the outer edge of the adjuster 124 and the inner edge of the core 121 are precisely defined so that the adjuster 124 is smooth in the core 121
can slide. The exact limitation can easily be made because of the circular section of the core and the adjuster
can be achieved. When the injection valve is set up,
then the adjuster is precisely controlled by an additional

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Adjustment device adjusted before a filter 122 is inserted into the core 121. Then it becomes the set state fixed or fixed by applying a prying force from the outside of the core 121. That's why it can Problem of adjustment disturbance due to inaccuracy of a screw with the aid of the present invention be solved.

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Claims (8)

- Zk - 23060 , Claims j) Fuel supply control device for internal combustion engine , marked by a normally closed fuel injector to control the amount of fuel to be fed into the machine corresponding to the opening time of the valve, and a device for electromagnetic control of the opening and closing the valve, wherein the device is energized to produce a first electromagnetic attraction that is big enough to keep the valve in the open State to hold after the valve has been opened once but is not large enough to turn the valve off to open the closed state while the first electromagnetic attraction force was generated before the valve was opened from the closed state, and wherein the device is maintained energized for a predetermined period of time when the valve is exited from closed State is opened to generate, on the other hand, a second electromagnetic attraction force that is large is enough to keep the valve open. 2. fuel supply control device for internal combustion engine; marked by a normally closed fuel injector to control the amount of fuel to be fed into the machine according to the opening time of the valve, and a device for electromagnetic control of the opening and closing the valve, the device being energized on the one hand to generate an electromagnetic attraction to generate the opening of the valve, and on the other hand 309836/0397 is energized for a predetermined period of time when the electromagnetic Attraction force to close the valve from the open state is switched off to a reverse s to generate magnetic flux, whereby the induced magnetic flux is extinguished, which prevents the electromagnetic Attraction is switched off. 3. Device according to claim 1, characterized in that that the device continues to be energized for a certain period of time when the first electromagnetic attraction to close the valve from the open state is switched off, thereby to a reverse magnetic flux generate that cancels the induced magnetic flux that prevents the first electromagnetic attraction is switched off. 4. Apparatus according to claim 3; characterized, that the device for valve control has an electromagnetic coil for controlling the opening and closing of the valve, a member for exciting the electromagnetic coil with a first current to generate the first electromagnetic To generate attraction, one limb to excite the electromagnetic coil with a second Current to generate the second electromagnetic attractive force and a member for exciting the electromagnetic Coil with a third current to generate the reverse magnetic flux for a predetermined period of time from the time when the first current from the electromagnetic coil is switched off. 5. Apparatus according to claim 3, characterized in that 309836/0397 that the device for valve control has an electromagnetic Coil device for controlling the opening and closing of the valve, a member for exciting the electromagnetic coil device with a valve- ^ opening current for a predetermined period of time to one third to generate electromagnetic attraction, wherein the third electromagnetic attraction so with, the first electromagnetic attraction cooperates, that the combined electromagnetic attraction from the first and third electromagnetic Attraction is large and long enough in duration to open the valve from the closed state, one-member for exciting the electromagnetic coil device with a holding current to the first electromagnetic To create attraction, and a limb to excite the electromagnetic coil device with a reverse magnetic flux control current, to reverse the magnetic flux for a to generate a predetermined period of time from the point in time when the holding current from the electromagnetic coil means is switched off. 6. Apparatus according to claim 5, characterized in that the electromagnetic coil means comprises a first electromagnetic coil which is energized with the holding current and the valve-opening current to _t to generate respectively the first and third electromagnetic attractive force and a second electromagnetic coil, the is excited with the reverse magnetic flux control current to generate the reverse magnetic flux. 7. The device according to claim 5 »characterized» that the electromagnetisch® Spulensisarichtang has a® 309836/0397 first electromagnetic coil excited with the holding current to generate the first electromagnetic attractive force to generate, and a second electromagnetic coil, which is selectively with the valve opening current and the reverse s magnetic flux control current is excited to each third to generate electromagnetic attraction and the reverse s magnetic flux. 8. Apparatus according to claim 7, characterized in that the means for exciting the second electromagnetic Winding with the valve opening current, a first control member for controlling the passage of the valve opening current to the second electromagnetic winding, the first electromagnetic winding parallel to the Control element is switched. 9 · Device according to claim 5 »characterized in that that the electromagnetic coil device has a first electromagnetic winding which is connected to the holding current is excited to the first electromagnetic attraction to generate a second electromagnetic coil excited with the valve opening current to the third to generate electromagnetic attraction, and a third electromagnetic coil to control the reverse magnetic flux is energized to generate the reverse magnetic flux. 309836/0397