EP0547260A1 - Dwell time monitoring for an ignition end stage in an internal combustion engine - Google Patents
Dwell time monitoring for an ignition end stage in an internal combustion engine Download PDFInfo
- Publication number
- EP0547260A1 EP0547260A1 EP91121610A EP91121610A EP0547260A1 EP 0547260 A1 EP0547260 A1 EP 0547260A1 EP 91121610 A EP91121610 A EP 91121610A EP 91121610 A EP91121610 A EP 91121610A EP 0547260 A1 EP0547260 A1 EP 0547260A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- time
- closing
- internal combustion
- ignition
- monitoring
- 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.)
- Granted
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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
- F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
- F02P3/04—Layout of circuits
- F02P3/055—Layout of circuits with protective means to prevent damage to the circuit, e.g. semiconductor devices or the ignition coil
- F02P3/0552—Opening or closing the primary coil circuit with semiconductor devices
-
- 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
- F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
- F02P3/04—Layout of circuits
- F02P3/055—Layout of circuits with protective means to prevent damage to the circuit, e.g. semiconductor devices or the ignition coil
- F02P3/0552—Opening or closing the primary coil circuit with semiconductor devices
- F02P3/0554—Opening or closing the primary coil circuit with semiconductor devices using digital techniques
Definitions
- the invention relates to an ignition device for internal combustion engines according to the preamble of claim (DE-PS 39 24 129).
- a monitoring device for the closing duration of the ignition coil primary circuit is known from the prior art mentioned, in which the limiting duration of the closing time is variably set as a function of the supply voltage.
- the current intensity of the primary circuit which is dependent on the closing time and reached at the time of ignition, determines the current intensity and voltage of the spark at the spark plug with other factors.
- the switch-on time of the primary circuit is determined from the quantities of ignition timing and closing time calculated in a manner known per se.
- Too long closing times can occur if the crankshaft position transmitter fails after the primary circuit is switched on, if software errors of the microprocessor forming the ignition device occur or if large negative engine speed gradients occur during the closing time.
- Monitoring devices are used to avoid excessively long closing times. These facilities should respond as quickly as possible and end the closing time if this lasts too long.
- the monitoring or limitation period is set depending on the supply voltage. This leads to disproportionately long monitoring times, in particular at high engine speeds, since the largest closing time, for example when the engine is idling, must be taken into account in the case of a dependency on the supply voltage alone.
- a certain memory area in the microprocessor is required for storing the supply voltage-dependent table of the individual values of the monitoring duration.
- the closing time of modern ignition devices is in no way dependent solely on the supply voltage, but also on the engine speed and engine load. At high engine speeds, the closing time is additionally limited, since overlapping switch-on times are not possible with a single existing ignition coil and are not desirable with several ignition coils.
- the monitoring period is therefore set as a function of the closing period and is therefore always only slightly longer than this. For example, by multiplying the closing time by a constant factor, for example 1.25, this operation can be carried out very easily. This requires an extremely small storage space for one or a few program lines.
- Line a shows the processed pulses KR of the position transmitter connected to the crankshaft of the internal combustion engine, the distances between which correspond to a specific crankshaft angle. These pulses are used to determine the crankshaft position and to calculate the speed and acceleration of the engine crankshaft. As a rule, the counting for each cycle (2 revolutions of the crankshaft corresponding to 720 ° KW) begins at the top dead center (not shown here) at the end of the compression stroke of a specific cylinder.
- Row b shows the computing times Ax for the cylinder x under consideration and for the following cylinder y.
- the ignition time, closing duration and start of closing for the ignition of the cylinder x are determined or calculated in a manner known per se from various operating parameters of the internal combustion engine in the microprocessor, not shown, and corresponding data are output to so-called compare registers.
- a register R1, R3 is loaded with a certain number each for the start of ignition and the ignition timing during the calculation time Ax and is counted down to zero with the internal clock of the microprocessor from a predetermined crankshaft position (time B for the start of closure; time D for the ignition timing).
- the corresponding command (closing or opening the primary circuit) is carried out at the moment when the counter reading has reached zero (time point C for the start of closing; time E for the ignition time).
- Line d shows the closing time SDx, which begins at time C when register R1 expires and ends at time E when register R 3 expires.
- a further compare register R2 is also loaded (line e), which is started when register R1 expires, that is, at time C, at the beginning of the closing period SDx.
- This register is set in such a way that its running time, determined by the internal microprocessor clock, corresponds to the monitoring time UDx, for example 1.25 times the closing time SDx.
- register R3 Due to one of the errors already mentioned (failure of the pulses of the crankshaft position transmitter after the start of register R1; software error of the microprocessor; large negative engine speed gradients in the CD area; etc.) it can now happen that register R3 is not started in time or not at all .
- the process is then repeated for the next cylinder y, starting with the calculation time Ay and immediately, for all cylinders in a cycle (720 ° KW) and for further cycles.
- the monitoring period implicitly takes into account all dependencies on the supply voltage, speed and load and any other parameters from which the closing period is determined.
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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)
Abstract
Zündeinrichtung für Brennkraftmaschinen mit einer Überwachungseinrichtung für die Schließdauer des Zündspulen-Primärstromkreises. Die Überwachungsdauer ist abhängig von der Schließdauer, beispielsweise durch Multiplikation der Schließdauer mit einem konstanten Faktor, einstellbar.
Description
Die Erfindung betrifft eine Zündeinrichtung für Brennkraftmaschinen nach dem Oberbegriff des Patentanspruchs (DE-PS 39 24 129).The invention relates to an ignition device for internal combustion engines according to the preamble of claim (DE-PS 39 24 129).
Aus dem genannten Stand der Technik ist eine Überwachungseinrichtung für die Schließdauer des Zündspulen-Primärstromkreises bekannt, bei welcher die Begrenzungsdauer der Schließzeit als Funktion der Versorgungsspannung variabel eingestellt wird.A monitoring device for the closing duration of the ignition coil primary circuit is known from the prior art mentioned, in which the limiting duration of the closing time is variably set as a function of the supply voltage.
Die von der Schließdauer abhängige, im Zündzeitpunkt erreichte Stromstärke des Primärstromkreises bestimmt mit anderen Faktoren Stromstärke und Spannung des Zündfunkens an der Zündkerze.The current intensity of the primary circuit, which is dependent on the closing time and reached at the time of ignition, determines the current intensity and voltage of the spark at the spark plug with other factors.
Aus den in an sich bekannter Weise berechneten Größen Zündzeitpunkt und Schließdauer wird der Einschaltzeitpunkt des Primärstromkreises, bezogen auf die Kurbelwellenstellung der Brennkraftmaschine, ermittelt.The switch-on time of the primary circuit, based on the crankshaft position of the internal combustion engine, is determined from the quantities of ignition timing and closing time calculated in a manner known per se.
Bei zu langen Schließdauern werden die Zündspulen und Schalttransistoren äußerst stark belastet, was bis zur Zerstörung durch zu große Temperaturen führen kann.If the closing times are too long, the ignition coils and switching transistors are extremely heavily loaded, which can lead to destruction by excessive temperatures.
Zu lange Schließdauern können entstehen, wenn der Kurbelwellenstellungsgeber nach Einschalten des Primärstromkreises ausfällt, wenn Softwarefehler des die Zündeinrichtung bildenden Mikroprozessors auftreten oder wenn während der Schließdauer große negative Motordrehzahl-Gradienten auftreten.Too long closing times can occur if the crankshaft position transmitter fails after the primary circuit is switched on, if software errors of the microprocessor forming the ignition device occur or if large negative engine speed gradients occur during the closing time.
Zur Vermeidung zu langer Schließdauern werden Überwachungseinrichtungen eingesetzt. Diese Einrichtungen sollen möglichst schnell ansprechen und die Schließdauer beenden, wenn diese zu lange andauert.Monitoring devices are used to avoid excessively long closing times. These facilities should respond as quickly as possible and end the closing time if this lasts too long.
Bei der bekannten Überwachungseinrichtung wird die Überwachungs- beziehungsweise Begrenzungsdauer abhängig von der Versorgungsspannung eingestellt. Dies führt insbesondere bei hohen Motordrehzahlen zu unverhältnismäßig langen Überwachungsdauern, da bei einer Abhängigkeit alleine von der Versorgungsspannung die größte Schließdauer, also etwa bei Motorleerlauf, berücksichtigt werden muß. Außerdem ist für die Speicherung der versorgungsspannungabhängigen Tabelle der einzelnen Werte der Überwachungsdauer ein gewisser Speicherbereich im Mikroprozessor erforderlich.In the known monitoring device, the monitoring or limitation period is set depending on the supply voltage. This leads to disproportionately long monitoring times, in particular at high engine speeds, since the largest closing time, for example when the engine is idling, must be taken into account in the case of a dependency on the supply voltage alone. In addition, a certain memory area in the microprocessor is required for storing the supply voltage-dependent table of the individual values of the monitoring duration.
Es ist Aufgabe der Erfindung, die bekannte Zündeinrichtung so weiterzubilden, daß in keinem Fall unnötig lange Überwachungsdauern entstehen können und daß Speicherplatzbelegungen im Mikroprozessor eingespart werden können.It is an object of the invention to develop the known ignition device in such a way that in no case can unnecessarily long monitoring times occur and that memory space occupancies in the microprocessor can be saved.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs gelöst.This object is achieved by the characterizing features of the patent claim.
Die Schließdauer moderner Zündeinrichtungen ist keinesfalls ausschließlich von der Versorgungsspannung, sondern auch von der Motordrehzahl und von der Motorlast abhängig. Bei hohen Motordrehzahlen wird zusätzlich die Schließdauer begrenzt, da überlappende Einschaltzeiten bei einer einzigen vorhandenen Zündspule nicht möglich und bei mehreren Zündspulen nicht erwünscht sind.The closing time of modern ignition devices is in no way dependent solely on the supply voltage, but also on the engine speed and engine load. At high engine speeds, the closing time is additionally limited, since overlapping switch-on times are not possible with a single existing ignition coil and are not desirable with several ignition coils.
Erfindungsgemäß wird deshalb die Überwachungsdauer abhängig von der Schließdauer eingestellt und ist somit immer nur geringfügig länger als diese. Beispielsweise durch Multiplikation der Schließdauer mit einem konstanten Faktor, zum Beispiel 1,25, ist diese Operation sehr einfach durchführbar. Dazu ist ein äußerst geringer Speicherplatz für eine oder wenige Programmzeilen erforderlich.According to the invention, the monitoring period is therefore set as a function of the closing period and is therefore always only slightly longer than this. For example, by multiplying the closing time by a constant factor, for example 1.25, this operation can be carried out very easily. This requires an extremely small storage space for one or a few program lines.
Die Erfindung wird anhand der Zeichung näher erläutert.The invention is explained in more detail with reference to the drawing.
In der Zeichnung ist der zeitliche Ablauf der Schließdauer SDx und der Überwachungsdauer ÜDx für den Zylinder x einer Brennkraftmaschine schematisch, aber nicht maßstäblich dargestellt.In the drawing, the chronological sequence of the closing time SDx and the monitoring time ÜDx for the cylinder x of an internal combustion engine is shown schematically, but not to scale.
In Zeile a sind die aufbereiteten Impulse KR des mit der Kurbelwelle der Brennkraftmaschine verbundenen Stellungsgebers dargestellt, deren Abstände einem bestimmten Kurbelwellenwinkel entsprechen. Diese Impulse dienen zur Ermittlung der Kurbelwellenstellung und zur Berechnung von Drehzahl und Beschleunigung der Motor-Kurbelwelle. In der Regel beginnt die Zählung für jeden Zyklus (2 Umdrehungen der Kurbelwelle entsprechend 720° KW) beim hier nicht dargestellten oberen Totpunkt am Ende des Kompressionstaktes eines bestimmten Zylinders.Line a shows the processed pulses KR of the position transmitter connected to the crankshaft of the internal combustion engine, the distances between which correspond to a specific crankshaft angle. These pulses are used to determine the crankshaft position and to calculate the speed and acceleration of the engine crankshaft. As a rule, the counting for each cycle (2 revolutions of the crankshaft corresponding to 720 ° KW) begins at the top dead center (not shown here) at the end of the compression stroke of a specific cylinder.
In Zeile b sind die Rechenzeiten Ax für den betrachteten Zylinder x und für den folgenden Zylinder y dargestellt. In der Zeit Ax werden im nicht dargestellten Mikroprozessor Zündzeitpunkt, Schließdauer und Schließbeginn für die Zündung des Zylinders x in an sich bekannter Weise aus verschiedenen Betriebsparametern der Brennkraftmaschine ermittelt beziehungsweise berechnet und entsprechende Daten an sogenannte Compare-Register ausgegeben. Für Schließbeginn und Zündzeitpunkt wird je ein Register R1, R3 während der Rechenzeit Ax mit einer bestimmten Zahl geladen und ab einer vorgegebenen Kurbelwellenstellung (Zeitpunkt B für den Schließbeginn; Zeitpunkt D für den Zündzeitpunkt) mit dem internen Takt des Mikroprozessors bis auf Null rückgezählt. In dem Augenblick, in welchem der Zählerstand Null erreicht ist (Zeipunkt C für den Schließbeginn; Zeitpunkt E für den Zündzeitpunkt) wird der entsprechende Befehl (Schließen beziehungsweise Öffnen des Primärstromkreises) durchgeführt.Row b shows the computing times Ax for the cylinder x under consideration and for the following cylinder y. In the time Ax, the ignition time, closing duration and start of closing for the ignition of the cylinder x are determined or calculated in a manner known per se from various operating parameters of the internal combustion engine in the microprocessor, not shown, and corresponding data are output to so-called compare registers. A register R1, R3 is loaded with a certain number each for the start of ignition and the ignition timing during the calculation time Ax and is counted down to zero with the internal clock of the microprocessor from a predetermined crankshaft position (time B for the start of closure; time D for the ignition timing). The corresponding command (closing or opening the primary circuit) is carried out at the moment when the counter reading has reached zero (time point C for the start of closing; time E for the ignition time).
Der jeweilige Zählerstand der Register R1 und R3 ist in der Zeichnung c dargestellt.The respective counter reading of registers R1 and R3 is shown in drawing c.
Zeile d zeigt die Schließdauer SDx, die bei Ablauf des Registers R1 im Zeitpunkt C beginnt und bei Ablauf des Registers R 3 im Zeitpunkt E endet.Line d shows the closing time SDx, which begins at time C when register R1 expires and ends at time E when register
Während der Rechenzeit Ax wird auch ein weiteres Compare-Register R2 geladen (Zeile e), welches bei Ablauf des Registers R1, also im Zeitpunkt C mit Beginn der Schließdauer SDx gestartet wird. Dieses Register ist so eingestellt, daß seine durch den internene Mikroprozessor-Takt bestimmte Laufzeit, die Überwachungsdauer ÜDx, beispielsweise dem 1,25fachen der Schließdauer SDx entspricht.During the computing time Ax, a further compare register R2 is also loaded (line e), which is started when register R1 expires, that is, at time C, at the beginning of the closing period SDx. This register is set in such a way that its running time, determined by the internal microprocessor clock, corresponds to the monitoring time UDx, for example 1.25 times the closing time SDx.
Durch einen der bereits erwähnten Fehler (Ausfall der Impulse des Kurbelwellen-Stellungsgebers nach Start des Registers R1; Softwarefehler des Mikroprozessors; große negative Motordrehzahlgradienten im Bereich C-D; usw.) kann es nun vorkommen, daß das Register R3 nicht rechtzeitig oder überhaupt nicht gestartet wird.Due to one of the errors already mentioned (failure of the pulses of the crankshaft position transmitter after the start of register R1; software error of the microprocessor; large negative engine speed gradients in the CD area; etc.) it can now happen that register R3 is not started in time or not at all .
Ist zum Zeitpunkt F bei Ablauf des Registers R2 der Primärstromkreis noch eingeschaltet (in Zeile d strichpunktiert dargestellt), so wird in diesem Zeitpunkt der Stromkreis geöffnet und eine Zündung eingeleitet, angedeutet durch ein strichpunktiertes Blitzsymbol im Zeitpunkt F (zum Unterschied von dem Blitzsymbol zum zeitgerechten Zündzeitpunkt im Zeitpunkt E).If the primary circuit is still switched on at time F when register R2 expires (shown in dash-dotted lines in line d), then the circuit is opened and an ignition is initiated at this time, indicated by a dash-dotted lightning symbol at time F (in contrast to the lightning symbol for the timely one Ignition point in time E).
Danach wiederholt sich der Vorgang für den nächsten Zylinder y, beginnend mit der Berechnungszeit Ay und sofort, für alle Zylinder eines Zyklus (720°KW) und für weitere Zyklen.The process is then repeated for the next cylinder y, starting with the calculation time Ay and immediately, for all cylinders in a cycle (720 ° KW) and for further cycles.
In der Überwachungsdauer, wie vorstehend berechnet, sind implizit alle Abhängigkeiten von Versorgungsspannung, Drehzahl und Last und eventuellen weiteren Parametern berücksichtigt, von welchen die Schließdauer bestimmt wird.The monitoring period, as calculated above, implicitly takes into account all dependencies on the supply voltage, speed and load and any other parameters from which the closing period is determined.
Claims (1)
dadurch gekennzeichnet,
daß die Überwachungsdauer (ÜD) abhängig von der zu überwachenden Schließdauer (SD) einstellbar ist.Ignition device for internal combustion engines with a monitoring device for the closing time (SD) of the primary circuit of at least one ignition coil, which is started at the same time as the start of closing (C) of the primary circuit and opens the primary circuit again after a monitoring time (ÜD) has expired, provided that this time (F) should still be closed,
characterized,
that the monitoring period (ÜD) is adjustable depending on the closing period (SD) to be monitored.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE59107635T DE59107635D1 (en) | 1991-12-17 | 1991-12-17 | Closing duration monitoring of an ignition output stage on an internal combustion engine |
| EP91121610A EP0547260B1 (en) | 1991-12-17 | 1991-12-17 | Dwell time monitoring for an ignition end stage in an internal combustion engine |
| JP4354689A JPH05248331A (en) | 1991-12-17 | 1992-12-17 | Ignition device for internal combustion engine |
| US07/992,149 US5301650A (en) | 1991-12-17 | 1992-12-17 | Ignition device for internal combustion engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP91121610A EP0547260B1 (en) | 1991-12-17 | 1991-12-17 | Dwell time monitoring for an ignition end stage in an internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0547260A1 true EP0547260A1 (en) | 1993-06-23 |
| EP0547260B1 EP0547260B1 (en) | 1996-03-27 |
Family
ID=8207442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91121610A Expired - Lifetime EP0547260B1 (en) | 1991-12-17 | 1991-12-17 | Dwell time monitoring for an ignition end stage in an internal combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5301650A (en) |
| EP (1) | EP0547260B1 (en) |
| JP (1) | JPH05248331A (en) |
| DE (1) | DE59107635D1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06173835A (en) * | 1992-12-14 | 1994-06-21 | Yamaha Motor Co Ltd | Engine ignition controller |
| JP3508258B2 (en) * | 1994-09-09 | 2004-03-22 | 株式会社デンソー | Ignition device for internal combustion engine |
| JPH10122109A (en) * | 1996-10-17 | 1998-05-12 | Toyota Motor Corp | Ignition timing control device for internal combustion engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2012353A (en) * | 1978-01-09 | 1979-07-25 | Renault | Apparatus for controlling the conducting time of an ignation coil for an internal combustion engine |
| WO1991001447A1 (en) * | 1989-07-20 | 1991-02-07 | Robert Bosch Gmbh | Monitoring device for an ignition end stage in an internal combustion engine |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2803556A1 (en) * | 1978-01-27 | 1979-08-02 | Bosch Gmbh Robert | DEVICE FOR CONTROLLING THE KEY RATIO OF A SIGNAL SEQUENCE WITH CHANGEABLE FREQUENCY |
| JPS5593964A (en) * | 1979-01-10 | 1980-07-16 | Hitachi Ltd | Electronic spark advance ignitor |
| JPS5820391B2 (en) * | 1979-09-27 | 1983-04-22 | 株式会社デンソー | Non-contact ignition device for internal combustion engines |
| JPS56104151A (en) * | 1980-01-24 | 1981-08-19 | Nippon Denso Co Ltd | Contactless ignition device for internal combustion engine |
| JPS61272471A (en) * | 1985-05-27 | 1986-12-02 | Honda Motor Co Ltd | Ignition timing control method when reference crank angle position detection system abnormality occurs in internal combustion engine |
| US4762110A (en) * | 1986-01-21 | 1988-08-09 | Mitsubishi Denki Kabushiki Kaisha | Ignition control device for internal combustion engine |
| JPS62225770A (en) * | 1986-03-28 | 1987-10-03 | Hitachi Ltd | Back-up device for electronic distributor |
| JPS6361775A (en) * | 1986-09-01 | 1988-03-17 | Nippon Denso Co Ltd | Ignition control device for internal combustion engine |
-
1991
- 1991-12-17 DE DE59107635T patent/DE59107635D1/en not_active Expired - Fee Related
- 1991-12-17 EP EP91121610A patent/EP0547260B1/en not_active Expired - Lifetime
-
1992
- 1992-12-17 US US07/992,149 patent/US5301650A/en not_active Expired - Lifetime
- 1992-12-17 JP JP4354689A patent/JPH05248331A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2012353A (en) * | 1978-01-09 | 1979-07-25 | Renault | Apparatus for controlling the conducting time of an ignation coil for an internal combustion engine |
| WO1991001447A1 (en) * | 1989-07-20 | 1991-02-07 | Robert Bosch Gmbh | Monitoring device for an ignition end stage in an internal combustion engine |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 12, no. 286 (M-727)5. August 1988 & JP-A-63 061 775 ( NIPPON DENSO CO LTD ) 17. März 1988 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US5301650A (en) | 1994-04-12 |
| EP0547260B1 (en) | 1996-03-27 |
| JPH05248331A (en) | 1993-09-24 |
| DE59107635D1 (en) | 1996-05-02 |
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