DE19756761A1 - Combustion misfiring detection method for IC engines - Google Patents

Combustion misfiring detection method for IC engines

Info

Publication number
DE19756761A1
DE19756761A1 DE1997156761 DE19756761A DE19756761A1 DE 19756761 A1 DE19756761 A1 DE 19756761A1 DE 1997156761 DE1997156761 DE 1997156761 DE 19756761 A DE19756761 A DE 19756761A DE 19756761 A1 DE19756761 A1 DE 19756761A1
Authority
DE
Germany
Prior art keywords
internal combustion
cylinders
engines
crankshaft
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE1997156761
Other languages
German (de)
Inventor
Werner Maehrle
Uwe V Orlikowski
Andreas Tropschug
Bernd Eichlinger
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE1997156761 priority Critical patent/DE19756761A1/en
Publication of DE19756761A1 publication Critical patent/DE19756761A1/en
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1015—Engines misfires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
    • F02D2400/02—Four-stroke combustion engines with electronic control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
    • F02D2400/04—Two-stroke combustion engines with electronic control

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The method measures the segmential times required by the crankshaft to move through given angular crankshaft areas. For 4-stroke engines, the given angular areas are smaller than 360 deg , multiplied by two and divided by the number of cylinders of the engine. For 2-stroke engines, the given areas are smaller than 360 deg divided by the number of engine cylinders. The given angular areas are variable for each cylinder, dependant upon operational parameters of the engine.

Description

Die Erfindung betrifft ein Verfahren zur Erkennung von Ver­ brennungsaussetzern bei mehrzylindrigen Brennkraftmaschinen in Kraftfahrzeugen nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for the detection of Ver misfires in multi-cylinder internal combustion engines in motor vehicles according to the preamble of the claim 1.

Stand der TechnikState of the art

Bei auftretenden Verbrennungsaussetzern, z. B. durch abgenutz­ te Zündkerzen oder durch fehlerhafte elektrische Verbindun­ gen, gelangt unverbranntes Gemisch in den Katalysator. Dieses Gemisch kann den Katalysator beschädigen, zumindest jedoch zu unerwünscht hohen Emissionen führen. Daher müssen bereits einzelne Verbrennungsaussetzer erkannt werden. Hierzu hat sich die Überwachung der Laufunruhe der Kurbelwelle als am besten geeignet herausgestellt. Tritt ein Verbrennungsausset­ zer auf, fehlt der Brennkraftmaschine das normalerweise durch die Verbrennung erzeugte Drehmoment. Dies führt zu einer kurzzeitigen Verlangsamung der Drehbewegung. Bei hoher Dreh­ zahl und niedriger Last beträgt die Verlängerung der Zeit von Zündung zu Zündung durch die Verlangsamung der Drehbewegung nur einen sehr geringen Prozentsatz. Dies erfordert eine hochgenaue Überwachung der Drehbewegung von Zündung zu Zün­ dung für jeden Zylinder.If combustion misfires occur, e.g. B. by worn out spark plugs or through faulty electrical connections unburned mixture enters the catalyst. This Mixture can damage the catalyst, but at least too lead to undesirably high emissions. Therefore already have to individual misfires can be detected. To do this monitoring the uneven running of the crankshaft than on best suited. Occurs a burn set zer, the engine normally misses this the torque generated by the combustion. This leads to a brief slowdown in the rotation. At high speed number and low load is the extension of the time from Ignition to ignition by slowing the rotation only a very small percentage. This requires one highly accurate monitoring of the rotation from ignition to ignition for each cylinder.

Ein derartiges Verfahren zur Erkennung von Verbrennungs­ aussetzern ist beispielsweise aus der DE 195 44 720 C1 be­ kannt. Hierbei wird die Laufruhe der Kurbelwelle mittels Messung vom Segmentzeiten, die die Kurbelwelle während der Arbeitstakte der einzelnen Zylinder zum Durchlaufen vorgege­ bener Kurbelwellen-Winkelbereiche benötigt, erfaßt. Demgemäß sind die vorgegebenen Kurbelwellen-Winkelbereiche bei Vier­ taktmotoren genau 360 Grad multipliziert mit zwei und geteilt durch die Anzahl der Zylinder der Brennkraftmaschine, also z. B. 120 Grad KW (KW=Kurbelwelle) bei 6-Zylindermotoren oder 180 Grad KW bei 4-Zylindermotoren. Hierdurch soll bisher je nach Zylinderanzahl einer Brennkraftmaschine der maximal mögliche Auswertebereich im Hinblick auf den vorgegebenen Winkelbereich verwendet werden.Such a method for the detection of combustion misfires is for example from DE 195 44 720 C1 knows. Here, the smoothness of the crankshaft is determined by Measurement of segment times that the crankshaft during the Work cycles of the individual cylinders are given to run through bener crankshaft angle ranges required, detected. Accordingly are the specified crankshaft angle ranges at four  clocked motors exactly 360 degrees multiplied by two and divided by the number of cylinders of the internal combustion engine, that is, for. B. 120 degrees KW (KW = crankshaft) with 6-cylinder engines or 180 degrees KW with 4-cylinder engines. This is said to be so far according to the number of cylinders of an internal combustion engine, the maximum possible evaluation range with regard to the given Angular range can be used.

Insbesondere bei Brennkraftmaschinen mit geringer Anzahl von Zylindern, z. B. bei Vierzylinder-Motoren, hat sich gezeigt, daß der maximal mögliche Auswertebereich im Hinblick auf den vorgegebenen Winkelbereich, hier z. B. 180 Grad KW, so groß ist, daß auch Antriebsstrangschwingungen insbesondere durch das Getriebe oder durch andere rotierende Teile des Antriebs­ strangs zu Stördrehbewegungsänderungen und damit zu einer fehlerhaften Verbrennungsaussetzererkennung führen.Particularly in the case of internal combustion engines with a small number of Cylinders, e.g. B. in four-cylinder engines, has been shown that the maximum possible evaluation range with regard to the predetermined angular range, here z. B. 180 degrees KW, so big is that drivetrain vibrations in particular by the gearbox or other rotating parts of the drive strands to disturbing rotational movement changes and thus to a faulty misfire detection.

Aufgabe der ErfindungObject of the invention

Es ist Aufgabe der Erfindung, das Verfahren zur Erkennung von Verbrennungsaussetzern bei mehrzylindrigen Brennkraftmaschi­ nen eingangs genannter Art derart zu verbessern, daß die Aussetzererkennung unempfindlicher gegenüber Einflüssen durch den Antriebsstrang wird.It is an object of the invention to identify the method for Misfires in multi-cylinder internal combustion engines NEN to improve such type that the Misfire detection less sensitive to influences the powertrain.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.This task is characterized by the characteristics of the Claim 1 solved.

Demnach sind die vorgegebenen Kurbelwellen-Winkelbereiche (KWsoll) bei Viertaktmotoren kleiner als 360 Grad multipli­ ziert mit zwei und geteilt durch die Anzahl der Zylinder der Brennkraftmaschine (d. h. KWsoll <(360° *2/Zylinderanzahl)) bzw. bei Zweitaktmotoren kleiner als 360 Grad geteilt durch die Anzahl der Zylinder der Brennkraftmaschine (d. h. KWsoll < (360°/Zylinderanzahl)). Accordingly, the specified crankshaft angle ranges (KWsoll) for four-stroke engines smaller than 360 degrees multipli adorned with two and divided by the number of cylinders of the Internal combustion engine (i.e. KWsoll <(360 ° * 2 / number of cylinders)) or for two-stroke engines smaller than 360 degrees divided by the number of cylinders of the internal combustion engine (i.e. KWsoll < (360 ° / number of cylinders)).  

Eine vorteilhafte Weiterbildung der Erfindung ist der Gegen­ stand des Unteranspruchs.An advantageous development of the invention is the counter stood the subclaim.

Demnach sind die vorgegebenen Kurbelwellen-Winkelbereiche in Abhängigkeit von Betriebsparametern der Brennkraftmaschine, z. B. von der Drehzahl oder von der Last, variabel, z. B. zwischen 60 Grad KW und 180 Grad KW bei Vierzylinder-Vier­ takt-Motoren, und bei Bedarf auch für jeden Zylinder unterschiedlich vorgebbar.Accordingly, the specified crankshaft angle ranges are in Dependency on operating parameters of the internal combustion engine, e.g. B. of the speed or of the load, variable, for. B. between 60 degrees KW and 180 degrees KW with four-cylinder four stroke engines, and if necessary also for each cylinder can be specified differently.

Durch diese Erfindung wird erreicht, daß die zur Auswertung der Verbrennungsaussetzer vorgegebenen Kurbelwellensegmente bzw. Winkelbereiche pro Zylinder nicht mehr nahtlos aneinan­ der anstoßen und dadurch eine freiere Positionierbarkeit der vorgegeben Winkelbereiche pro Zylinder gegeben ist. Auch trägt die gegebenenfalls in Abhängigkeit von Betriebsparame­ tern der Brennkraftmaschine variable Vorgabe der Winkelberei­ che zu einer höheren Flexibilität zur Optimierung der korrek­ ten Verbrennungsaussetzererkennung bei.This invention ensures that the evaluation the misfires given crankshaft segments or angular ranges per cylinder no longer seamlessly the trigger and thereby a more free positioning of the given angular ranges per cylinder. Also if necessary, depending on the operating parameters tern of the internal combustion engine variable specification of the angular range che to a higher flexibility to optimize the correct misfire detection.

Claims (2)

1. Verfahren zur Erkennung von Verbrennungsaussetzern bei mehrzylindrigen Brennkraftmaschinen in Kraftfahrzeugen durch Überwachung der Laufruhe der Kurbelwelle mittels Messung vom Segmentzeiten, die die Kurbelwelle während der Arbeitstakte der einzelnen Zylinder zum Durchlaufen vorgegebener Kurbelwellen-Winkelbereiche benötigt, da­ durch gekennzeichnet, daß die vorgegebenen Kurbelwellen-Winkel­ bereiche bei Viertaktmotoren kleiner als 360 Grad multipliziert mit zwei und geteilt durch die Anzahl der Zylinder der Brennkraftmaschine bzw. bei Zweitaktmotoren kleiner als 360 Grad geteilt durch die Anzahl der Zylin­ der der Brennkraftmaschine sind.1. A method for detecting misfires in multi-cylinder internal combustion engines in motor vehicles by monitoring the smooth running of the crankshaft by measuring the segment times that the crankshaft needs during the work cycles of the individual cylinders to run through predetermined crankshaft angle ranges, since characterized in that the predetermined crankshaft angle ranges for four-stroke engines less than 360 degrees multiplied by two and divided by the number of cylinders of the internal combustion engine or for two-stroke engines less than 360 degrees divided by the number of cylinders of the internal combustion engine. 2. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, daß die vorgegebenen Kurbelwellen-Winkelbereiche in Ab­ hängigkeit von Betriebsparametern der Brennkraftmaschine für jeden Zylinder variabel vorgebbar sind.2. The method according to claim 1, characterized in that the predetermined crankshaft angle ranges in Ab dependency on operating parameters of the internal combustion engine can be variably specified for each cylinder.
DE1997156761 1997-12-19 1997-12-19 Combustion misfiring detection method for IC engines Ceased DE19756761A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1997156761 DE19756761A1 (en) 1997-12-19 1997-12-19 Combustion misfiring detection method for IC engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1997156761 DE19756761A1 (en) 1997-12-19 1997-12-19 Combustion misfiring detection method for IC engines

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DE19756761A1 true DE19756761A1 (en) 1999-06-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10122154A1 (en) * 2001-05-08 2002-11-14 Bayerische Motoren Werke Ag Detecting 4-stroke internal combustion engine rough running, involves determining time required per revolution to pass through crankshaft angle range, and comparing successive time intervals

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932379A (en) * 1989-05-01 1990-06-12 General Motors Corporation Method for detecting engine misfire and for fuel control
WO1991011599A1 (en) * 1990-01-26 1991-08-08 Robert Bosch Gmbh Process for detecting misfiring in an internal combustion engine
DE4135797A1 (en) * 1990-11-01 1992-05-21 Fuji Heavy Ind Ltd Misfire discriminating method for engine
DE4206118A1 (en) * 1991-02-27 1992-09-03 Mitsubishi Electric Corp Misfire detector with crankshaft tachometer for combustion engine - invalidates alarm signals from conventional detector when engine speed exceeds or load falls below predetermined value
DE4318282C2 (en) * 1992-06-02 1996-08-14 Mitsubishi Electric Corp Misfire detection system for internal combustion engines
DE19518411A1 (en) * 1995-05-19 1996-11-21 Bosch Gmbh Robert Identifying combustion interruptions in multi-cylinder IC engine
DE19641610A1 (en) * 1995-10-09 1997-04-10 Denso Corp Misfiring detector for multi-cylinder IC engine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932379A (en) * 1989-05-01 1990-06-12 General Motors Corporation Method for detecting engine misfire and for fuel control
WO1991011599A1 (en) * 1990-01-26 1991-08-08 Robert Bosch Gmbh Process for detecting misfiring in an internal combustion engine
DE4135797A1 (en) * 1990-11-01 1992-05-21 Fuji Heavy Ind Ltd Misfire discriminating method for engine
DE4206118A1 (en) * 1991-02-27 1992-09-03 Mitsubishi Electric Corp Misfire detector with crankshaft tachometer for combustion engine - invalidates alarm signals from conventional detector when engine speed exceeds or load falls below predetermined value
DE4318282C2 (en) * 1992-06-02 1996-08-14 Mitsubishi Electric Corp Misfire detection system for internal combustion engines
DE19518411A1 (en) * 1995-05-19 1996-11-21 Bosch Gmbh Robert Identifying combustion interruptions in multi-cylinder IC engine
DE19641610A1 (en) * 1995-10-09 1997-04-10 Denso Corp Misfiring detector for multi-cylinder IC engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10122154A1 (en) * 2001-05-08 2002-11-14 Bayerische Motoren Werke Ag Detecting 4-stroke internal combustion engine rough running, involves determining time required per revolution to pass through crankshaft angle range, and comparing successive time intervals
DE10122154B4 (en) * 2001-05-08 2014-11-20 Bayerische Motoren Werke Aktiengesellschaft Method and device for detecting the uneven running in four-stroke internal combustion engines

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Ipc: F02D 4122

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R008 Case pending at federal patents court (fpc)
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