EP0656096A1 - Ignition system for internal combustion engines with misfire detection through comparison with reference firings in the same ignition coil. - Google Patents

Ignition system for internal combustion engines with misfire detection through comparison with reference firings in the same ignition coil.

Info

Publication number
EP0656096A1
EP0656096A1 EP94913011A EP94913011A EP0656096A1 EP 0656096 A1 EP0656096 A1 EP 0656096A1 EP 94913011 A EP94913011 A EP 94913011A EP 94913011 A EP94913011 A EP 94913011A EP 0656096 A1 EP0656096 A1 EP 0656096A1
Authority
EP
European Patent Office
Prior art keywords
ignition
spark
voltage
coil
values
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
Application number
EP94913011A
Other languages
German (de)
French (fr)
Other versions
EP0656096B1 (en
Inventor
Karl-Heinz Kugler
Karlheinz Riedel
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0656096A1 publication Critical patent/EP0656096A1/en
Application granted granted Critical
Publication of EP0656096B1 publication Critical patent/EP0656096B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F02P17/12—Testing characteristics of the spark, ignition voltage or current

Definitions

  • the invention is based on an ignition system for internal combustion engines for monitoring individual ignition processes according to the category of the main claim.
  • An ignition system with a monitoring device is already known from DE-OS 41 16 642.
  • ignition spark duration and ignition spark voltage are detected by detecting the combustion voltage transformed on the primary side and compared with limit values for correct ignition, so that when a faulty combustion is detected, a corresponding error signal, for example an optical signal, is output on the dashboard of the vehicle becomes.
  • the limit values for correct ignition as a function of operating ranges are determined in the application and stored in a memory.
  • the ignition system according to the invention with the characterizing features of the main claim has the advantage that the size values for a correct ignition are not fixed, but are adapted to changing conditions, such as ignition coils with different parameters. Changes in the parameters of an ignition coil can thus be taken into account, for example, after the ignition coil has been replaced in the workshop and an ignition coil from another manufacturer has been used by adjusting the limit values. The result of this is that an ignition fault is not erroneously recognized after an ignition coil replacement, although the ignition was correct or that a signal for correct ignition is output while the ignition was faulty. It is furthermore advantageous that the reference value for the limit values of correct ignition, the measured quantities of spark duration and operating voltage are used, which are measured in a cylinder which is fed by the same ignition coil.
  • the measure specified in the subclaims enables advantageous further developments and improvements of the ignition system specified in the main claim. It is particularly advantageous to store the measured values of the spark duration and the operating voltage, which are used for the reference value formation, in load and speed classes. Ultimately, it is advantageous to cyclically renew the values for the reference value formation, for example using the last 10 historical values for the reference value formation and replacing the oldest value with the newly measured value after each ignition. Ultimately, it is advantageous to use only the measured values of the cylinders which are fed by the same ignition coil for the comparison. With an internal combustion engine with rotating distribution, the measured values of all cylinders can thus be compared, while when using double spark coils, for example, only the cylinders that are fed by this double spark coil are compared.
  • FIG. 1 shows the basic structure for detecting the spark duration and the operating voltage with a double spark coil and spark plugs
  • FIG. 2 shows the voltage curve in normal operation
  • FIG. 2a showing the work cycle
  • FIG. 2b the exhaust cycle
  • FIG. 3 showing the voltage curve when the spark plug 2 has a short to ground
  • Figure 3a shows the voltage curve in the working cycle and Figure 3b in the exhaust cycle
  • Figure 4a the voltage curve in the exhaust cycle and in Figure 4b a working cycle
  • Figure 5 is a flow chart for error detection.
  • FIG. 1 shows a possibility of detecting and monitoring the voltage on the primary winding 10 of a double spark coil 11.
  • a tap 13 is provided between the primary winding 10 and the control transistor 12, which is led to the emitter of a pnp transistor.
  • the burning voltage induced on the primary side is thus conducted via a voltage divider 15/16 to the positive input of a comparator 17.
  • a spark plug ZK1 and ZK2 is assigned to each end of the secondary winding 19.
  • the spark plug ZK2 is assigned a dashed connection 20 and a resistor 21 with dashed lines.
  • These representations 20 and 21 are intended to illustrate a shunt resistor on the spark plug ZK2, which is formed, for example, by contamination of the spark plug.
  • FIG. 2 shows the voltage curve at the spark plugs ZK1 and ZK2 during combustion, with the voltage curve U (ZK1), the spark plug ZK1 in the working cycle, and the voltage curve U (ZK2) in the exhaust cycle in FIG. 2a ⁇ ending spark plug ZK2 shown. It can be seen here that the operating voltage in the working cycle is significantly greater than in the exhaust cycle due to the gas mixture and response voltage of the candles, but the spark lengths t1 to t2 are approximately the same.
  • FIGS. 3 and 4 each show the voltage curve at the spark plugs, while there is a ground fault on the spark plug ZK2, in FIG. 3 the spark plug ZK2 with the ground fault is in the exhaust stroke and in FIG. 4 in the working stroke .
  • FIG. 3a shows the voltage curve u (ZKl) on the spark plug ZK1 in the work cycle
  • FIG. 3b the spark plug ZK2 is in the exhaust cycle with a ground fault. Since no energy is converted at the spark plug ZK2, but the same amount of energy is available as in normal operation, the spark duration t1 to t2 will be longer.
  • the work cycle at spark plug ZK2 with a short to ground cannot make any contribution to the voltage profile, since here too the energy is available for normal operation and the breakdown and operating voltage at spark plug ZK1 in FIG. 5a are very low in the exhaust cycle , the spark duration tl to t2 will be significantly longer than in normal operation.
  • step 31 the burning voltage U1 and U2 as well as the time of the breakdown ignition and the time of the end of the spark are determined in order to determine the spark duration t1 to t2.
  • step 32 these recorded values are assigned to the respective load or speed and are thus stored in tables.
  • Subsequent query 33 examines whether the detected values of the operating voltage and the spark duration associated with an ignition coil are approximately the same, taking into account an applicable tolerance variable T. If query 33 could be answered with yes, that is, if the measured variables correspond to the previously formed reference values, the yes output leads to a work step 34 in which the ignition is evaluated as OK. A no to query 33 leads to work step 35, in which the ignition examined is assessed as faulty. In a subsequent work step 36, error measures such as, for example, switching off the injection in this cylinder or increasing the voltage supply at the ignition coil are initiated so that in this case the spark plug can possibly burn itself free. At the same time, it is possible to output optical or acoustic error information for the driver of the internal combustion engine or to save the error.
  • the subsequent ignition is examined in an analogous manner. It is important in the method carried out that only the measured measurement values of an ignition which are triggered by the same ignition coil are compared. In the case of an internal combustion engine with a rotating distribution, the measured values of all the cylinders could be compared with one another, whereas, for example, in the case of ignition coils with double-spark coils, only the cylinders which are assigned to one and the same ignition coil can be compared.

Abstract

The invention pertains to an ignition system for internal combustion engines with means for detecting misfirings. This ignition system makes it possible to detect the combustion voltage transformed on the primary side and to assess the spark duration and/or ignition combustion voltage through comparison with limit values for a proper ignition. The limit values for a proper ignition are derived from the measured values of a reference firing. The reference firing is the ignition triggered by the energy potential of the same ignition coil.

Description

Zündanlage für Brennkraftmaschinen mit FehlZündungserkennung durch Vergleich mit Referenzzündungen derselben ZündspuleIgnition system for internal combustion engines with misfire detection by comparison with reference ignitions of the same ignition coil
Stand der TechnikState of the art
Die Erfindung geht aus von einer Zündanlage für Brennkraftmaschinen zur Überwachung einzelner Zündvorgänge nach der Gattung des Haupt¬ anspruchs. Es ist schon eine Zündanlage mit einer Überwachungsein- richtung aus der DE-OS 41 16 642 bekannt. Bei dieser Zündanlage wer¬ den durch Erfassen der auf die Primärseite transformierten Brenn¬ spannung Zündfunkenbrenndauer und Zundfunkenbrennspannung erfaßt und mit Grenzwerten für eine korrekte Zündung verglichen, so daß beim Erkennen einer fehlerhaften Verbrennung ein entsprechendes Fehler¬ meldesignal beispielsweise ein optisches Signal am Armaturenbrett des Fahrzeuges ausgegeben wird. Hierbei sind die Grenzwerte für eine korrekte Zündung in Abhängigkeit von Betriebsbereichen in der Appli¬ kation ermittelt und in einem Speicher abgelegt. The invention is based on an ignition system for internal combustion engines for monitoring individual ignition processes according to the category of the main claim. An ignition system with a monitoring device is already known from DE-OS 41 16 642. In this ignition system, ignition spark duration and ignition spark voltage are detected by detecting the combustion voltage transformed on the primary side and compared with limit values for correct ignition, so that when a faulty combustion is detected, a corresponding error signal, for example an optical signal, is output on the dashboard of the vehicle becomes. In this case, the limit values for correct ignition as a function of operating ranges are determined in the application and stored in a memory.
Vorteile der ErfindungAdvantages of the invention
Die erfindgύngsgemäße Zündanlage mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die Grenwerte für eine korrekte Zündung nicht fest vorgegeben sind, sondern sich verändernden Bedingungen, wie beispielsweise Zündspulen mit anderen Parametern, angepaßt werden. Somit kann auf veränderte Parameter einer Zündspule beispielsweise nach einem Austausch der Zündspule in der Werkstatt und der Verwendung einer Zündspule eines anderen Her¬ stellers durch Anpassung der Grenzwerte Rechnung getragen werden. Dies führt dazu, daß nach einem Zündspulenaustausch nicht fälsch¬ licherweise ein Zündfehler erkannt wird, obwohl die Zündung korrekt war bzw. daß ein Signal für eine korrekte Zündung ausgegeben wird, während die Zündung fehlerhaft war.Es ist weiterhin von Vorteil, daß zur Referenzwertbildung für die Grenzwerte einer korrekten Zündung die gemessenen Größen Funkendauer und Brennspannung verwendet wer¬ den, die in einem Zylinder gemessen werden, welcher von der gleichen Zündspule gespeist wird.The ignition system according to the invention with the characterizing features of the main claim has the advantage that the size values for a correct ignition are not fixed, but are adapted to changing conditions, such as ignition coils with different parameters. Changes in the parameters of an ignition coil can thus be taken into account, for example, after the ignition coil has been replaced in the workshop and an ignition coil from another manufacturer has been used by adjusting the limit values. The result of this is that an ignition fault is not erroneously recognized after an ignition coil replacement, although the ignition was correct or that a signal for correct ignition is output while the ignition was faulty. It is furthermore advantageous that the reference value for the limit values of correct ignition, the measured quantities of spark duration and operating voltage are used, which are measured in a cylinder which is fed by the same ignition coil.
Durch die in den Unteransprüchen aufgeführte Maßnahme sind vorteil¬ hafte Weiterbildungen und Verbesserungen der im Hauptanspruch ange¬ gebenen Zündanlage möglich. Besonders vorteilhaft ist es, die gemes¬ senen Werte der Funkendauer und der Brennspannung, die für die Refe¬ renzwertbildung verwendet werden, in Last- und Drehzahlklassen abzu¬ legen. Letztendlich ist es vorteilhaft, die Werte für die Referenz- wertbildung zyklisch zu erneuern, wobei beispielsweise die letzten 10 Vergangenheitswerte für die Referenzwertbildung benutzt werden und nach jeder Zündung der älteste Wert durch den neu gemessenen Wert ersetzt wird. Letztendlich ist es vorteilhaft, für den Ver¬ gleich nur die Meßwerte der Zylinder heranzuziehen, die von dersel¬ ben Zündspule gespeist werden. Bei einer Brennkraftmaschine mit rotierender Verteilung, können somit die Meßwerte aller Zylinder verglichen werden, während bei der Verwendung von Doppelfunkenspulen beispielsweise nur die Zylinder miteinander verglichen werden, die von dieser Doppelfunkenspule gespeist werden.The measure specified in the subclaims enables advantageous further developments and improvements of the ignition system specified in the main claim. It is particularly advantageous to store the measured values of the spark duration and the operating voltage, which are used for the reference value formation, in load and speed classes. Ultimately, it is advantageous to cyclically renew the values for the reference value formation, for example using the last 10 historical values for the reference value formation and replacing the oldest value with the newly measured value after each ignition. Ultimately, it is advantageous to use only the measured values of the cylinders which are fed by the same ignition coil for the comparison. With an internal combustion engine with rotating distribution, the measured values of all cylinders can thus be compared, while when using double spark coils, for example, only the cylinders that are fed by this double spark coil are compared.
Zeichnungdrawing
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 den Prinzipaufbau zur Erfassung der Funkendauer und der Brennspannung it eienr Doppelfunkenspule und Zündkerzen, Figur 2 zeigt den Spannungsverlauf im Normalbetrieb, wobei Figur 2a den Ar¬ beitstakt, Figur 2b den Auspufftakt darstellt, in Figur 3 ist der Spannungsverlauf dargestellt, wenn die Zündkerze 2 einen Masseschluß hat, wobei Figur 3a den Spannungsverlauf im Arbeitstakt und Figur 3b im Auspufftakt darstellt, in Figur 4a ist der Spannungsverlauf im Auspufftakt und in Figur 4b ein Arbeitstakt dargestellt, wobei im Gegensatz zu 3a und 3b die Zündkerze mit Masseschluß sich im Ar¬ beitstakt befindet, und Figur 5 einen Ablaufplan zur Fehlererkennung.Embodiments of the invention are shown in the drawing and explained in more detail in the following description. FIG. 1 shows the basic structure for detecting the spark duration and the operating voltage with a double spark coil and spark plugs, FIG. 2 shows the voltage curve in normal operation, FIG. 2a showing the work cycle, FIG. 2b the exhaust cycle, and FIG. 3 showing the voltage curve when the spark plug 2 has a short to ground, Figure 3a shows the voltage curve in the working cycle and Figure 3b in the exhaust cycle, in Figure 4a the voltage curve in the exhaust cycle and in Figure 4b a working cycle, whereas in contrast to 3a and 3b the spark plug with short circuit is in Work cycle is located, and Figure 5 is a flow chart for error detection.
Beschreibung der AusfuhrungsbeispieleDescription of the exemplary embodiments
Figur 1 zeigt eine Möglichkeit, die Spannung an der Primärwicklung 10 einer Doppelfunkenspule 11 zu erfassen und zu überwachen. Hierbei ist zwischen der Primärwicklung 10 und dem Steuertransistor 12 ein Abgriff 13 vorgesehen, welcher an den Emitter eines pnp-Transistors geführt ist. Die primärseitig induzierte Brennspannung wird so über einen Spannungsteiler 15/16 an den positiven Eingang eines Kompara¬ tors 17 geführt. Am zweiten Eingang des Komparators 17 liegt eineFIG. 1 shows a possibility of detecting and monitoring the voltage on the primary winding 10 of a double spark coil 11. Here, a tap 13 is provided between the primary winding 10 and the control transistor 12, which is led to the emitter of a pnp transistor. The burning voltage induced on the primary side is thus conducted via a voltage divider 15/16 to the positive input of a comparator 17. There is one at the second input of the comparator 17
Referenzspannung U an, die beispielsweise von einem SteuergerätReference voltage U on, for example from a control unit
RERE
18 für den jeweiligen Betriebszustand vorgegeben wird. Somit steht am Ausgang des Komparators 17 ein der Funkendauer entsprechendes digitales Signal zur Verfügung, welches an das Steuergerät 18 ge¬ führt ist. Eine weitere Möglichkeit besteht darin, die induzierte Brennspannung über den pnp-Transistor 14 und den Spannungsteiler 15/16 direkt an das Steuergerät 18 zu führen, um neben der Funken¬ dauer auch den Brennspannungsverlauf auszuwerten.18 is specified for the respective operating state. Thus there is a spark duration corresponding to the output of the comparator 17 digital signal is available, which leads to the control unit 18. Another possibility is to lead the induced operating voltage directly to the control unit 18 via the pnp transistor 14 and the voltage divider 15/16, in order to evaluate the operating voltage curve in addition to the spark duration.
Bei der dargestellten Doppelfunkenspule 11 ist jedem Ende der Sekun¬ därwicklung 19 eine Zündkerze ZK1 und ZK2 zugeordnet ist. Der Zünd¬ kerze ZK2 ist eine gestrichelte Verbindung 20 und gestrichelt ein Widerstand 21 zugeordnet. Diese Darstellung 20 und 21 soll einen Nebenschlußwiderstand an der Zündkerze ZK2 verdeutlichen, welcher beispielsweise durch Verschmutzungen der Zündkerze gebildet wird.In the illustrated double spark coil 11, a spark plug ZK1 and ZK2 is assigned to each end of the secondary winding 19. The spark plug ZK2 is assigned a dashed connection 20 and a resistor 21 with dashed lines. These representations 20 and 21 are intended to illustrate a shunt resistor on the spark plug ZK2, which is formed, for example, by contamination of the spark plug.
Figur 2 zeigt den Spannungsverlauf an den Zündkerzen ZK1 und ZK2 während einer Verbrennung, wobei in Figur 2a der Spannungsverlauf U(ZK1), der sich im Arbeitstakt befindenden Zündkerze ZK1, und in Figur 2b der Spannungsverlauf U(ZK2), der sich im Auspufftakt befin¬ denden Zündkerze ZK2 dargestellt. Hier ist ersichtlich, daß die Brennspannung im Arbeitstakt aufgrund von Gasgemisch und Ansprech¬ spannung der Kerzen deutlich größer ist als im Auspufftakt, während jedoch die Funkendauerlängen tl bis t2 annähernd gleich sind.FIG. 2 shows the voltage curve at the spark plugs ZK1 and ZK2 during combustion, with the voltage curve U (ZK1), the spark plug ZK1 in the working cycle, and the voltage curve U (ZK2) in the exhaust cycle in FIG. 2a ¬ ending spark plug ZK2 shown. It can be seen here that the operating voltage in the working cycle is significantly greater than in the exhaust cycle due to the gas mixture and response voltage of the candles, but the spark lengths t1 to t2 are approximately the same.
In den Figuren 3 und 4 ist jeweils der Spannungsverlauf an den Zünd¬ kerzen dargestellt, während sich an der Zündkerze ZK2 ein Masse¬ schluß befindet, wobei bei Figur 3 sich die Zündkerze ZK2 mit Masse¬ schluß im Auspufftakt und bei Figur 4 im Arbeisttakt befindet.FIGS. 3 and 4 each show the voltage curve at the spark plugs, while there is a ground fault on the spark plug ZK2, in FIG. 3 the spark plug ZK2 with the ground fault is in the exhaust stroke and in FIG. 4 in the working stroke .
Figur 3a zeigt den Spannungsverlauf u(ZKl) an der Zündkerze ZK1 im Arbeitstakt, während sich in Figur 3b die Zündkerze ZK2 mit Masse¬ schluß im Auspufftakt befindet. Da an der Zündkerze ZK2 keine Ener¬ gie umgesetzt wird, jedoch die gleiche Energiemenge wie im Normal¬ betrieb zu Verfügung steht, wird die Funkendauer tl bis t2 größer sein. In Figur 4b kann der Arbeitstakt an Zündkerze ZK2 mit Masseschluß keinen Beitrag zum Spannungsverlauf liefern, da aber auch hier die Energie für den Normalbetrieb zur Verfügung steht und Durch¬ bruch- und Brennspannung an der Zündkerze ZK1 in Figur 5a im Aus¬ pufftakt sehr gering sind, wird die Funkendauer tl bis t2 deutlich größer sind als im Normalbetrieb.FIG. 3a shows the voltage curve u (ZKl) on the spark plug ZK1 in the work cycle, while in FIG. 3b the spark plug ZK2 is in the exhaust cycle with a ground fault. Since no energy is converted at the spark plug ZK2, but the same amount of energy is available as in normal operation, the spark duration t1 to t2 will be longer. In FIG. 4b, the work cycle at spark plug ZK2 with a short to ground cannot make any contribution to the voltage profile, since here too the energy is available for normal operation and the breakdown and operating voltage at spark plug ZK1 in FIG. 5a are very low in the exhaust cycle , the spark duration tl to t2 will be significantly longer than in normal operation.
In Figur 5 sind schematisch die einzelnen Verfahrensschritte zur Durchführung des Verfahrens dargestellt. Im Arbeitsschritt 31 wird die Brennspannung Ul und U2 sowie der Zeitpunkt der Durchbruchszün- dung und der Zeitpunkt des Funkenendes zur Ermittlung der Funken¬ dauer tl bis t2 erfaßt. Im Arbeitsschritt 32 werden diese erfaßten Werte der jeweiligen Last bzw. Drehzahl zugeordnet und so bewertet in Tabellen abgelegt.In Figure 5, the individual process steps for performing the method are shown schematically. In step 31, the burning voltage U1 and U2 as well as the time of the breakdown ignition and the time of the end of the spark are determined in order to determine the spark duration t1 to t2. In step 32, these recorded values are assigned to the respective load or speed and are thus stored in tables.
In der anschließenden Abfrage 33 wird untersucht, ob die zu einer Zündspule gehörigen erfaßten Werte der Brennspannung und der Funken¬ dauer unter Berücksichtigung einer applizierbaren Toleranzgröße T annähernd gleich sind. Konnte die Abfrage 33 mit ja beantwortet wer¬ den, entsprechen also die gemessenen Größen den vorher gebildeten Referenzwerten, so führt der ja-Ausgang zu einem Arbeitsschritt 34, in welchem die Zündung als in Ordnung gewertet wird. Ein nein auf die Abfrage 33 führt zum Arbeitsschritt 35, in welchem die unter¬ suchte Zündung als fehlerhaft gewertet wird. In einem anschließenden Arbeitsschritt 36 werden nun Fehlermaßnahmen, wie beispielsweise die Abschaltung der Einspritzung in diesem Zylinder bzw. die Erhöhung des Spannungsangebotes an der Zündspule eingeleitet, damit sich in diesem Fall die Zündkerze möglicherweise selbst freibrennen kann. Gleichzeitig ist es möglich eine optische oder akkustische Fehler¬ information für den Fahrer der Brennkraftmaschine auszugeben bzw. den Fehler abzuspeichern. Im anschließenden Arbeitsschritt 37 wird die darauffolgende Zündung in analoger Weise untersucht. Wichtig bei dem durchgeführten Verfahren ist, daß jeweils nur die erfaßten Meßwerte einer Zündung verglichen werden, die von der gleiche Zündspule ausgelöst werden. Bei einer Brennkraftmaschine mit rotierender Verteilung könnten so die gemessenen Werte aller Zylin¬ der miteinander verglichen werden, während beispielsweise bei Zünd¬ spulen mit Doppelfunkenspulen nur die Zylinder vergleichbar sind, die ein und derselben Zündspule zugeordnet sind. Subsequent query 33 examines whether the detected values of the operating voltage and the spark duration associated with an ignition coil are approximately the same, taking into account an applicable tolerance variable T. If query 33 could be answered with yes, that is, if the measured variables correspond to the previously formed reference values, the yes output leads to a work step 34 in which the ignition is evaluated as OK. A no to query 33 leads to work step 35, in which the ignition examined is assessed as faulty. In a subsequent work step 36, error measures such as, for example, switching off the injection in this cylinder or increasing the voltage supply at the ignition coil are initiated so that in this case the spark plug can possibly burn itself free. At the same time, it is possible to output optical or acoustic error information for the driver of the internal combustion engine or to save the error. In the subsequent step 37, the subsequent ignition is examined in an analogous manner. It is important in the method carried out that only the measured measurement values of an ignition which are triggered by the same ignition coil are compared. In the case of an internal combustion engine with a rotating distribution, the measured values of all the cylinders could be compared with one another, whereas, for example, in the case of ignition coils with double-spark coils, only the cylinders which are assigned to one and the same ignition coil can be compared.

Claims

Ansprüche Expectations
1. Zündanlage für Brennkraftmaschinen mit mindestens einer Zündspule (11) und einem mit der Primärwicklung (10) in Reihe liegenden steu¬ erbarem Schalter (12) sowie einer am hochspannungsseitigem Ende der Sekundärwicklung angeschlossenen Zündkerze und einem zwischen Pri¬ märwicklung und Schalter (12) liegendem Abgriff (13) zur Erfassung der auf die Primärseite transformierten Brennspannung sowie einer nachgeordneten Auswerteschaltung (17, 18) zum Vergleich der erfaßten Brennspannung mit Grenzwerten für eine korrekte Verbrennung, dadurch gekennzeichnet, daß die Zündspule eine Doppelfunkenspule ist und an jedem Ende der Sekundärwicklung eine Zündkerze (ZK1, ZK2) ange¬ schlossen ist und die Grenzwerte für eine korrekte Verbrennung aus der erfaßten Brennspannung mindestens eines vorhergehenden Verbren¬ nungszyklus festlegbar sind.1. Ignition system for internal combustion engines with at least one ignition coil (11) and a controllable switch (12) lying in series with the primary winding (10) and a spark plug connected to the high-voltage end of the secondary winding and one between the primary winding and switch (12) horizontal tap (13) for detecting the burning voltage transformed on the primary side and a downstream evaluation circuit (17, 18) for comparing the detected burning voltage with limit values for correct combustion, characterized in that the ignition coil is a double spark coil and one at each end of the secondary winding Spark plug (ZK1, ZK2) is connected and the limit values for correct combustion can be determined from the detected combustion voltage of at least one previous combustion cycle.
2. Zündanlage nach Anspruch 1, dadurch gekennzeichnet, daß eine vor¬ gebbare Anzahl von Vergangenheitswerten für die Grenzwertfestlegung verwendbar ist.2. Ignition system according to claim 1, characterized in that a predeterminable number of past values can be used for determining the limit value.
3. Zündanlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die erfaßten Werte der Brennspannung für Zündfunkenbrenndauer und/oder Zundfunkenbrennspannung um einen bestimmten Wert (T) von den Grenzwerten für eine korrekte Verbrennung abweichen dürfen. 3. Ignition system according to claim 1 or 2, characterized in that the detected values of the burning voltage for spark duration and / or ignition spark voltage may deviate by a certain value (T) from the limit values for correct combustion.
EP94913011A 1993-05-19 1994-04-22 Ignition system for internal combustion engines with misfire detection through comparison with reference firings in the same ignition coil Expired - Lifetime EP0656096B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4316775 1993-05-19
DE4316775A DE4316775C2 (en) 1993-05-19 1993-05-19 Ignition system with a monitoring device for individual ignition processes for an internal combustion engine
PCT/DE1994/000449 WO1994027043A1 (en) 1993-05-19 1994-04-22 Ignition system for internal combustion engines with misfire detection through comparison with reference firings in the same ignition coil

Publications (2)

Publication Number Publication Date
EP0656096A1 true EP0656096A1 (en) 1995-06-07
EP0656096B1 EP0656096B1 (en) 1996-12-11

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US (1) US5507264A (en)
EP (1) EP0656096B1 (en)
CN (1) CN1047431C (en)
DE (2) DE4316775C2 (en)
ES (1) ES2095762T3 (en)
PL (1) PL307056A1 (en)
RU (1) RU2121598C1 (en)
WO (1) WO1994027043A1 (en)

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CN1104834A (en) 1995-07-05
ES2095762T3 (en) 1997-02-16
PL307056A1 (en) 1995-05-02
WO1994027043A1 (en) 1994-11-24
RU2121598C1 (en) 1998-11-10
US5507264A (en) 1996-04-16
DE59401262D1 (en) 1997-01-23
RU95105456A (en) 1996-11-20
DE4316775A1 (en) 1994-11-24
DE4316775C2 (en) 1995-05-18
CN1047431C (en) 1999-12-15
EP0656096B1 (en) 1996-12-11

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