WO1991011599A1 - Detection des rates d'un moteur a combustion interne - Google Patents

Detection des rates d'un moteur a combustion interne Download PDF

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Publication number
WO1991011599A1
WO1991011599A1 PCT/DE1991/000013 DE9100013W WO9111599A1 WO 1991011599 A1 WO1991011599 A1 WO 1991011599A1 DE 9100013 W DE9100013 W DE 9100013W WO 9111599 A1 WO9111599 A1 WO 9111599A1
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WO
WIPO (PCT)
Prior art keywords
cylinder
misfires
value
mean
threshold value
Prior art date
Application number
PCT/DE1991/000013
Other languages
German (de)
English (en)
Inventor
Martin Klenk
Winfried Moser
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 WO1991011599A1 publication Critical patent/WO1991011599A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/11—Testing internal-combustion engines by detecting misfire

Definitions

  • the invention relates to a method for determining in which cylinder the misfires occur. Several cylinders can also be affected, which is then determined accordingly.
  • combustion misfires can be due to various causes, e.g. B. by misfiring or by excessive emaciation or over-greasing of the mixture.
  • states of the art e.g. B. by misfiring or by excessive emaciation or over-greasing of the mixture.
  • Misfire detection methods which compare the angular velocity values of the crankshaft with one another, which are measured within predetermined angular ranges. These methods have the advantage that no separate sensor is required, but there is the problem that angular velocities of the crankshaft depend not only on combustion processes, but also in particular on forces which are transmitted from the roadway to the crankshaft via the wheels and the drive train . In order not to erroneously identify misfires in a cylinder due to external influences, it is known (DE-A-36 15 547) to recognize misfires in a cylinder only when the misfire detection conditions have been met several times in succession.
  • the method is not applicable, since in this case the difference values remain essentially zero permanently.
  • the process is therefore only carried out completely if it is determined in the course of the process that misfires occur for the first time. If it is found in the test just mentioned that misfires have existed since the start of the method, a conventional angular acceleration method can be used to determine a cylinder with misfires. However, in the case just mentioned, it is preferred to proceed in such a way that
  • This method uses signals that are also used for the method that provides particularly precise results when misfires only occur during the course of the method and can therefore be used in a particularly advantageous manner together with it. However, it can also be used alone or together with another method.
  • misfire detection signal is essentially unchanged, to decide that the cylinder which actually has misfires has been correctly disconnected from the fuel supply, - On the other hand, if the misfire detection signal changes significantly, add fuel to the cylinder concerned and check again which cylinder triggered the misfire detection.
  • This method can also be used together with the method of claim 1, but in connection with this method it will very rarely lead to a revision of the decision made.
  • FIG. 1 shows a flow diagram for explaining a method for determining a cylinder with misfires in an internal combustion engine
  • FIG. 2 diagram relating to the time course of the smallest mean value of time difference values for a cylinder a with misfires
  • FIG. 3 shows a diagram which is time-correlated with the diagram of FIG. 2 and represents the time profile of a mean difference value and an overall mean value
  • FIG. 4 flow chart for explaining a sub-method with which a decision made regarding a cylinder is checked with misfires. Description of exemplary embodiments
  • step s1 a period of time T (z) is measured for every cylinder z (z from 1-Z) every 720 ° crank angle, within which the crankshaft rotates by a predetermined crank angle in the combustion cycle of the cylinder. Is measured e.g. B. between TDC of the piston in the combustion cycle and 720o / Z after TDC, that is over a range of 180 ° from TDC in a four-cylinder engine or from 120 ° from TDC in a six-cylinder engine. The measurement takes place every 720o / Z crank angle for one cylinder each.
  • step s2 a misfire detection signal is retrieved, as is provided by any cylinder-selective misfire detection method.
  • step s3 it is checked whether misfires are present. If the engine runs without interruption, processing of other routines in the main program continues.
  • step s4 the moving average MW_DT (z) of the time difference values DT (z) is first formed in a step s4 according to the following equation:
  • MW_DT (z) k x MW_DT (z) _alt + (1 - k) DT (z)
  • k is a filter factor ⁇ 1, which is preferably above 0.9, in particular between 0.93 and 0.95. It is pointed out that the moving average can also be formed differently, e.g. B. by deleting the oldest value in a series of values and adding the new value.
  • step s5 It is then checked (step s5) whether the misfires are present from the start of the method. This can check z. B. take place in that a start detection flag is set to zero with the start of the internal combustion engine. When the method illustrated by FIG. 1 returns, this flag is set to one. If step s5 is already reached during the first run of the method after the engine is started because of misfires, the flag is still at zero. If this is the case, it is decided in a step s6 that the cylinder a has misfires for which the averaged time difference value MW-DT (a) is above a threshold value SW. In a step s7, the cylinder a is disconnected from the fuel supply.
  • step s8 follows, which is carried out every 720 ° / Z crank angle for one of the Z cylinders.
  • the change in the moving average formed in step s4 is examined.
  • the moving average will fluctuate only slightly as long as there are no misfires in the cylinder in question.
  • the mean initially runs quickly and then slower and slower to a new value.
  • the change which, as just mentioned, initially has a large value, is calculated as follows:
  • DMW_DT (z) MW_DT (z) - MW_DT (z) _old If a mean value difference value DMW_DT (z) ⁇ 0, it is set to zero.
  • the old mean gets the value of the new mean.
  • step s7 If this condition is met for several cylinders, this is a sign that misfires occur in all of these cylinders. For all these cylinders, the steps already mentioned follow from step s7.
  • the time course of various of the signals just mentioned can be seen in a time-correlated manner from FIGS. 2 and 3. No dropouts should occur up to a point in time ZP_A.
  • the mean value difference value MW_DT for an individual cylinder a, in which misfires then occur from the time ZP_A, is then very low.
  • the mean value increases from this point in time, but this is only examined from a point in time ZP_E at which the presence of misfires is detected with the aid of another method.
  • the detection time ZP_E must not be so far behind the occurrence time ZP_A that the mean value MW_DT (A) is already largely at its new value is swinging. Then no significant change over time in the mean value just mentioned could be determined.
  • the threshold value for the comparison with the mean value difference values can be used instead of the explained overall mean value MW_DMW, for example a predefined threshold value.
  • the procedure according to the exemplary embodiment has the advantage that the threshold value is continuously adapted to operating conditions and that, after the occurrence of misfires, it changes in time in a similar way to how a mean value difference value to be compared changes.
  • step s11 the misfire detection signal is called up by any cylinder-selective misfire detection method, which was already mentioned above with reference to step s2. If the measure in step s7 regarding the disconnection of cylinder a from the fuel supply was correct, the misfire detection signal must not have changed. However, if the wrong cylinder was no longer supplied with fuel, this cylinder now also shows misfires, in addition to the cylinder that triggered the determination process. A significant change in the drive detection signal, which may be determined in step s12, is therefore a sign that the wrong cylinder has been switched off. If this is the case, the fuel supply is in a step s13 released for cylinder a again. Routines of the main program follow the following label B, within which the described determination method is also called up again.
  • Wrong decisions can also be avoided within certain limits in that a cylinder a is only separated from the fuel supply when it has been found in several runs of the determination method according to FIG. 1 up to step s10 that this cylinder has misfires.
  • this method does not work as quickly as that described with reference to FIG. 4, and there is also the problem that a predetermined number of misfire detections for a cylinder can also be achieved accidentally within a predetermined period of time, namely when e.g. B. Faults from the roadway are transmitted randomly in such strength and time sequence that these faults are quickly assigned to a single cylinder in succession. Wrong decisions based on such a situation are practically excluded by the method according to FIG. 4.
  • a healing attempt can be made from time to time in a known manner, i. H. the cylinder is supplied with fuel again and it is examined whether misfires still occur.
  • the measure of stopping the supply of fuel to a misfiring cylinder is not the only measure that can be taken in such a case.
  • the cylinder can also be disconnected from the air supply and / or a lambda control can be switched to control.
  • a lambda control can be switched to control.

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

Abstract

Dans un procédé pour la détection d'un cylindre présentant des ratés dans un moteur à combustion interne à Z cylindres, on procède de la manière suivante: pour chaque cylindre z (z de 1 - Z) est mesuré un intervalle T(z), à l'intérieur duquel le vilebrequin tourne d'un angle prédéterminé pendant le cycle de combustion du cylindre, et pour chaque cylindre est établie la valeur de la différence de temps DT(z) = T(z) - T(z -1); suivant un procédé quelconque non sélectif du cylindre, il est déterminé si des ratés ont lieu ou non, ensuite, si des ratés ont lieu pour la première fois au cours du déroulement du procédé, le calcul de la valeur moyenne de la valeur de différence, avec comparaison de la valeur-seuil, est effectué pour chaque cylindre, puis, si un critère de valeur-seuil de valeur moyenne prédéterminé est rempli pour un cylindre, il est alors établi que ce cylindre présente des ratés. Ce procédé permet une détection fiable d'un cylindre présentant des ratés, sans utilisation de capteurs particuliers.
PCT/DE1991/000013 1990-01-26 1991-01-09 Detection des rates d'un moteur a combustion interne WO1991011599A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4002209.9 1990-01-26
DE19904002209 DE4002209C2 (de) 1990-01-26 1990-01-26 Aussetzererkennung bei einem Verbrennungsmotor

Publications (1)

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WO1991011599A1 true WO1991011599A1 (fr) 1991-08-08

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WO (1) WO1991011599A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2692623A1 (fr) * 1992-06-23 1993-12-24 Renault Procédé de repérage cylindres pour le pilotage d'un système d'injection électronique d'un moteur à combustion interne.
DE4324200A1 (de) * 1992-07-21 1994-01-27 Fuji Heavy Ind Ltd Fehlzündungserkennungsverfahren für einen Motor
EP0618436A2 (fr) * 1993-04-02 1994-10-05 Ford Motor Company Limited Mesure du taux des ratés d'allumage d'un moteur
US5387253A (en) * 1992-12-28 1995-02-07 Motorola, Inc. Spectral misfire detection system and method therefor
US5503007A (en) * 1992-10-05 1996-04-02 Motorola, Inc. Misfire detection method and apparatus therefor
US5515281A (en) * 1993-08-04 1996-05-07 Centro Richerche Fiat Societa' Sortile Per Azioni Process and system for detecting misfiring in internal combustion engines
GB2271854B (en) * 1992-10-08 1997-04-09 Fuji Heavy Ind Ltd Misfire detection method for engine
US5804711A (en) * 1993-09-07 1998-09-08 Remboski; Donald J. Pattern recognition method and system for determining a misfire condition in a reciprocating engine
DE19756761A1 (de) * 1997-12-19 1999-06-24 Bayerische Motoren Werke Ag Verfahren zur Erkennung von Verbrennungsaussetzern
US6070567A (en) * 1996-05-17 2000-06-06 Nissan Motor Co., Ltd. Individual cylinder combustion state detection from engine crankshaft acceleration
WO2010086069A1 (fr) * 2009-01-28 2010-08-05 Robert Bosch Gmbh Dispositif et procédé pour faire fonctionner un moteur à combustion interne, programme d'ordinateur, produit de programme d'ordinateur
CN114320593A (zh) * 2020-09-29 2022-04-12 丰田自动车株式会社 内燃机的失火检测装置和方法

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JPH0781935B2 (ja) * 1991-08-29 1995-09-06 トヨタ自動車株式会社 多気筒内燃機関の失火検出装置
JP2606019B2 (ja) * 1991-09-18 1997-04-30 三菱電機株式会社 内燃機関の失火検出装置
DE4345417B4 (de) * 1992-06-15 2004-03-11 Mitsubishi Denki K.K. Fehlzündungserfassungsvorrichtung für eine Brennkraftmaschine
JP2855969B2 (ja) * 1992-06-15 1999-02-10 三菱電機株式会社 内燃機関の失火検出装置
DE4337275A1 (de) * 1993-11-02 1995-05-04 Bayerische Motoren Werke Ag Vorrichtung zur zylinderselektiven Erkennung von unerwünschten Verbrennungsvorgängen bei mehrzylindrigen Brennkraftmaschinen
DE19548604C1 (de) * 1995-09-14 1997-02-20 Mtu Friedrichshafen Gmbh Verfahren zur zylinderindividuellen Bestimmung relativer Unterschiede ungleichförmiger Zylindermomente bei einer Kolbenbrennkraftmaschine und Anwendung des Verfahrens
KR100465609B1 (ko) * 1995-12-21 2005-04-06 지멘스 악티엔게젤샤프트 내연기관의주기적연소변동을검출하기위한방법
DE19844910A1 (de) * 1998-09-30 2000-04-06 Bosch Gmbh Robert Einrichtung zur Phasenerkennung
DE10261618B4 (de) * 2002-12-27 2014-05-22 Volkswagen Ag Laufunruheauswertungsverfahren
DE102011003244B4 (de) * 2011-01-27 2019-10-10 Continental Aktiengesellschaft Erkennen von irregulären Verbrennungsvorgängen in einem Zylinder einer Brennkraftmaschine während einer Startphase der Brennkraftmaschine
CN111140354B (zh) * 2019-12-20 2021-10-08 潍柴动力股份有限公司 整车失火的检测方法和检测装置
CN114635795B (zh) * 2022-03-17 2023-09-19 东风汽车集团股份有限公司 混合动力汽车失火监测方法及混合动力汽车

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DE3615547A1 (de) * 1985-05-09 1986-11-13 Nippondenso Co. Ltd., Kariya, Aichi Vorrichtung zur erkennung eines fehlerhaft arbeitenden zylinders eines mehrzylinder-verbrennungsmotors, sowie verfahren zum betreiben der vorrichtung
JPS62228640A (ja) * 1986-03-29 1987-10-07 Mitsubishi Motors Corp 多気筒エンジンにおける特定気筒の失火判別方法
EP0140065B1 (fr) * 1983-10-04 1988-12-07 Robert Bosch Gmbh Dispositif électronique de commande de la quantité de combustible d'un moteur à combustion interne
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EP0354497B1 (fr) * 1988-08-08 1993-02-10 Hitachi, Ltd. Dispositif de détection de défaut de combustion et système de commande pour moteur à combustion interne
DE69125194T2 (de) * 1990-01-09 1997-07-17 Atsugi Unisia Corp Verfahren und Vorrichtung zur Detektierung eines Verbrennungsdefekts in einem Zylinder einer inneren Brennkraftmaschine

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DE3615547A1 (de) * 1985-05-09 1986-11-13 Nippondenso Co. Ltd., Kariya, Aichi Vorrichtung zur erkennung eines fehlerhaft arbeitenden zylinders eines mehrzylinder-verbrennungsmotors, sowie verfahren zum betreiben der vorrichtung
JPS62228640A (ja) * 1986-03-29 1987-10-07 Mitsubishi Motors Corp 多気筒エンジンにおける特定気筒の失火判別方法
DE3933826A1 (de) * 1988-10-12 1990-04-19 Mitsubishi Electric Corp Motorregler fuer brennkraftmaschinen

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0576334A1 (fr) * 1992-06-23 1993-12-29 Regie Nationale Des Usines Renault S.A. Procédé de repérage cylindres pour le pilotage d'un système d'injection électronique d'un moteur à combustion interne
US5425340A (en) * 1992-06-23 1995-06-20 Regie Nationale Des Usines Renault S.A. Process of marking cylinders for control of an electronic injection system of an internal combustion engine
FR2692623A1 (fr) * 1992-06-23 1993-12-24 Renault Procédé de repérage cylindres pour le pilotage d'un système d'injection électronique d'un moteur à combustion interne.
DE4324200C2 (de) * 1992-07-21 1998-09-10 Fuji Heavy Ind Ltd Fehlzündungserkennungsverfahren für einen Motor
DE4324200A1 (de) * 1992-07-21 1994-01-27 Fuji Heavy Ind Ltd Fehlzündungserkennungsverfahren für einen Motor
US5503007A (en) * 1992-10-05 1996-04-02 Motorola, Inc. Misfire detection method and apparatus therefor
GB2271854B (en) * 1992-10-08 1997-04-09 Fuji Heavy Ind Ltd Misfire detection method for engine
US5387253A (en) * 1992-12-28 1995-02-07 Motorola, Inc. Spectral misfire detection system and method therefor
EP0618436A2 (fr) * 1993-04-02 1994-10-05 Ford Motor Company Limited Mesure du taux des ratés d'allumage d'un moteur
EP0618436A3 (fr) * 1993-04-02 1995-04-12 Ford Motor Co Mesure du taux des ratés d'allumage d'un moteur.
US5515281A (en) * 1993-08-04 1996-05-07 Centro Richerche Fiat Societa' Sortile Per Azioni Process and system for detecting misfiring in internal combustion engines
US5804711A (en) * 1993-09-07 1998-09-08 Remboski; Donald J. Pattern recognition method and system for determining a misfire condition in a reciprocating engine
US6070567A (en) * 1996-05-17 2000-06-06 Nissan Motor Co., Ltd. Individual cylinder combustion state detection from engine crankshaft acceleration
DE19756761A1 (de) * 1997-12-19 1999-06-24 Bayerische Motoren Werke Ag Verfahren zur Erkennung von Verbrennungsaussetzern
WO2010086069A1 (fr) * 2009-01-28 2010-08-05 Robert Bosch Gmbh Dispositif et procédé pour faire fonctionner un moteur à combustion interne, programme d'ordinateur, produit de programme d'ordinateur
CN114320593A (zh) * 2020-09-29 2022-04-12 丰田自动车株式会社 内燃机的失火检测装置和方法

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DE4002209A1 (de) 1991-08-01
DE4002209C2 (de) 2003-05-08

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