EP1585894A1 - Method for protecting a spark ignition engine catalyst in case of combustion misfiring - Google Patents

Method for protecting a spark ignition engine catalyst in case of combustion misfiring

Info

Publication number
EP1585894A1
EP1585894A1 EP03778423A EP03778423A EP1585894A1 EP 1585894 A1 EP1585894 A1 EP 1585894A1 EP 03778423 A EP03778423 A EP 03778423A EP 03778423 A EP03778423 A EP 03778423A EP 1585894 A1 EP1585894 A1 EP 1585894A1
Authority
EP
European Patent Office
Prior art keywords
injection
cylinder
cylinders
detected
cut
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
EP03778423A
Other languages
German (de)
French (fr)
Other versions
EP1585894B1 (en
Inventor
Jérôme CHANDONNAY
Antoine Pineau
Louis Renou
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP1585894A1 publication Critical patent/EP1585894A1/en
Application granted granted Critical
Publication of EP1585894B1 publication Critical patent/EP1585894B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
    • 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
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices

Definitions

  • the invention relates to positive-ignition engines, and more particularly the preservation of the catalysts associated with them in the event of misfires.
  • the anti-pollution standards (European, American and other countries) impose the monitoring of systems having an impact on the polluting emissions of vehicles by so-called OBD ("On-Board Diagnostic") devices.
  • OBD On-Board Diagnostic
  • combustion is subject to a special treatment, since the standards impose the detection of misfires (problem on ignition, injection, or mechanical components).
  • misfires problem on ignition, injection, or mechanical components.
  • the catalytic system is jeopardized. Indeed, the unburned mixture rejected in the exhaust line will produce an exothermic reaction in the catalyst which will then be abnormally heated and risk of being damaged. It is possible to reach temperatures higher than
  • the standard therefore requires that the driver be notified quickly so that he changes the engine's operating point to reduce the risk of catalyst degradation.
  • the temperature rise of the catalyst is extremely rapid, and it is possible that the catalyst has already undergone degradation before the driver realizes that his engine has suffered a failure.
  • the strategy of cutting the injection following the detection of misfire on one or more cylinders is a strategy coupled with a strategy of detection of misfire allowing to identify at each top dead center the presence or absence of a misfire.
  • this phasing is carried out by a software strategy.
  • this strategy is distorted by the presence of misfires, which risks leading to poor phasing of the injection: the injector should open during the exhaust phase on each of the cylinders so that the petrol is available in the intake manifold when opening the intake valve.
  • the injector should open during the exhaust phase on each of the cylinders so that the petrol is available in the intake manifold when opening the intake valve.
  • it opens an engine revolution too early. This does not prevent the engine from running, but its performance may be degraded.
  • the existing state of the art shows certain methods making it possible to cut the injection on cylinders detected as faulty, but none makes it possible to control the phasing of the injection in the case of engines devoid of sensors capable of performing the phasing control. , or in case of failure of such a sensor.
  • the invention aims to remedy this shortcoming.
  • the invention therefore provides a method for preserving the catalyst of a spark-ignition engine in the event of misfires.
  • the method comprises a phase of detection of misfires on matched cylinders of the engine, and a degraded mode in which, in the presence of a detected cylinder in fault and its paired cylinder detected as not being in default and in the absence of external information for controlling the motor phasing (this absence resulting from the absence of a sensor or else from a faulty sensor), a phasing control of the injection of to determine which of these two cylinders is actually faulty.
  • control of the phasing of the injection comprises:
  • the injection is restored on the cylinder initially detected in fault, the engine is rephased, and the injection is cut on the paired cylinder which is actually in default.
  • any injection cutout on a third cylinder is prohibited, even if it is detected as a fault.
  • the degraded mode is put on standby in the case where all the cylinders are detected as faulty.
  • an injection reset is carried out on cylinders for which an injection cutoff was made, under stable engine conditions. Furthermore, it is preferable to limit the number of deliveries of injections at idle speed.
  • the injection when a fault on one or more cylinders is observed at idling, the injection is not cut off on this or these cylinders.
  • the method includes a phase of detection of misfires on the engine cylinders and on a limited horizon of revolution.
  • the detection phase provides the following information (steps 10, 11 and
  • misfire failure
  • this phase provides at each top dead center the presence or absence of a misfire, and the diagnostic status or not of this detection strategy.
  • the method according to the invention includes a degraded mode, more particularly illustrated in FIG. 2.
  • the degraded mode strategy is activated. This number is an adjustable parameter, which must be determined according to the speed with which we want to see the degraded mode activate, and the robustness of it.
  • the strategy (step 20) then checks the cylinders detected as faulty (cylinders whose misfire rates exceed a calibrated threshold).
  • a sensor for example a camshaft sensor
  • the injection is cut off on the faulty cylinders. Indeed, the gasoline injected and not burned is responsible for the temperature rise in the catalyst, the cut of injection thus reduces the risks of destruction of the catalyst.
  • the injection cut does not create a safety risk for the driver. For more precaution, the number of cut cylinders is limited to 2.
  • step 21 • sensor,. if the engine is fitted), if. a cylinder is detected as faulty but its paired cylinder is free of it (step 21), the phasing control can be carried out (step 24).
  • the injection is cut on the faulty cylinder detected (step 22).
  • step 23 When the injection is cut on the faulty cylinder (s) (step 23), the number of misfires during each ignition on the cylinder which is matched to it is counted, and during a determined measurement horizon detected on it. If this cylinder (which was free of defect) has a misfires rate higher than a calibrated value, the cut cylinder is not the one that has. has been detected in default, but the cylinder which has been matched to it.
  • the cylinder detected in fault is the cylinder matched to that actually detected as faulty.
  • the engine must therefore be rephased (that is to say, shift the injection pattern by one engine revolution).
  • the injection is restored during the rephasing process (step 25) in order to preserve the residual performance of the vehicle, and the engine is rephased (step 26) (progressive shift of the injection until the correct timing of the injection is obtained).
  • the injection on the faulty cylinder can then be cut off when the rephasing is finished (step 27). If two cylinders of the same pair are detected faulty, the injection is carried out on the two cylinders (step 28), the phasing control is then not possible. The injection is then cut on the faulty pair of cylinders since the problem of phasing does not arise. It then becomes impossible to cut a third cylinder, even if a fault is detected on another cylinder, in order to ensure the safety of the vehicle.
  • misfire which could damage the catalyst "is declared without there being one or more cylinders detected as a fault. This then means that misfires appear on all the cylinders. This can in particular be the case during a fuel supply problem.
  • the strategy is put on hold (no injection cut) until a configuration in which the cut can be detected (at least one cylinder which does not burn) is detected.
  • the degraded mode is put on standby as mentioned above.
  • the degraded mode causes a misfire fault, it is not possible to clear the fault when the injection cut-out has been performed.
  • it is necessary to return to normal operating conditions that is to say by injecting on all the cylinders
  • the injection is returned to the cylinders in fault, in order to check whether the fault is still present, in which case the injection is cut again on the faulty cylinder (s). Otherwise, the degraded mode is stopped until the fault reappears.
  • Degraded mode is not activated under the conditions allowing delivery of injection for confirmation of the fault: this makes it possible to avoid delivering injection to the cylinders which have just been cut.
  • this operating mode authorizes the exit from the degraded mode for checking the fault;
  • the number of attempts to reset injection to idle should also be limited: after a certain (adjustable) number of attempts to reset injection for which the fault is confirmed, the degraded mode is definitively confirmed until engine shutdown. Indeed, after a certain number of attempts, it can be estimated that the fault is not a transient fault. In this case, it should persist until the vehicle stops. It must be ensured that a complete detection horizon takes place with the degraded mode deactivated, otherwise the detected fault corresponds to the injection cut off caused.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention concerns a method comprising a phase which consists in detecting combustion misfiring on the engine paired cylinders, and a downgraded mode whereby, upon detection (20) of a failed cylinder while its paired cylinder is not failed and in the absence of an external control information the engine phasing, the injection phasing is controlled (24) so as to determine which of the two cylinders is actually defective.

Description

Procédé pour préserver le catalyseur d'un moteur à allumage commandé en cas de ratés de combustion Method for preserving the catalyst of a spark-ignition engine in the event of misfires
L'invention concerne les moteurs à allumage commandé, et plus particulièrement la préservation des catalyseurs qui leur sont associés en cas de ratés de combustion.The invention relates to positive-ignition engines, and more particularly the preservation of the catalysts associated with them in the event of misfires.
Les normes antipollution (européennes, américaines et d'autres pays) imposent la surveillance des systèmes ayant un impact sur les émissions polluantes des véhicules par des dispositifs dits OBD ("On- Board Diagnostic"). Parmi les systèmes devant être surveillés, la combustion fait l'objet d'un traitement spécial, puisque les normes imposent la détection des ratés de combustion (problème sur l'allumage, l'injection, ou des composants mécaniques). Lorsque de tels ratés apparaissent à des taux importants, le système catalytique est mis en péril. En effet, le mélange non brûlé rejeté dans la ligne d'échappement va produire une réaction exothermique dans le catalyseur qui sera alors anormalement échauffé et risque d'être endommagé. Il est possible d'atteindre des températures supérieures àThe anti-pollution standards (European, American and other countries) impose the monitoring of systems having an impact on the polluting emissions of vehicles by so-called OBD ("On-Board Diagnostic") devices. Among the systems to be monitored, combustion is subject to a special treatment, since the standards impose the detection of misfires (problem on ignition, injection, or mechanical components). When such failures appear at significant rates, the catalytic system is jeopardized. Indeed, the unburned mixture rejected in the exhaust line will produce an exothermic reaction in the catalyst which will then be abnormally heated and risk of being damaged. It is possible to reach temperatures higher than
1300°C. La norme impose donc de prévenir rapidement le conducteur afin qu'il change le point de fonctionnement du moteur pour diminuer les risques de dégradation du catalyseur.1300 ° C. The standard therefore requires that the driver be notified quickly so that he changes the engine's operating point to reduce the risk of catalyst degradation.
En pratique, la montée de température du catalyseur est extrêmement rapide, et il est possible que le catalyseur ait déjà subi une dégradation avant que le conducteur ne s'aperçoive que son moteur est victime d'une défaillance.In practice, the temperature rise of the catalyst is extremely rapid, and it is possible that the catalyst has already undergone degradation before the driver realizes that his engine has suffered a failure.
Il est donc nécessaire de programmer dans le calculateur d'injection, des stratégies permettant d'assurer l'intégrité du catalyseur et notamment en procédant à la coupure des injecteurs sur le(s) cylindre(s) défaillant(s).It is therefore necessary to program in the injection computer, strategies to ensure the integrity of the catalyst and in particular by switching off the injectors on the faulty cylinder (s).
La stratégie de coupure de l'injection suite à la détection de ratés de combustion (misfire) sur un ou plusieurs cylindres est une stratégie couplée à une stratégie de détection des ratés de combustion permettant d'identifier à chaque point mort haut la présence ou l'absence d'un raté de combustion.The strategy of cutting the injection following the detection of misfire on one or more cylinders is a strategy coupled with a strategy of detection of misfire allowing to identify at each top dead center the presence or absence of a misfire.
Dans le cas d'une application sur un moteur dépourvu d'un système de phasage d'injection au moyen d'un capteur de lecture de position sur l'arbre à cames ou d'un moyen physique de contrôle du phasage (par exemple capteurs dans la chambre de combustion), ce phasage s'effectue par une stratégie logicielle. Or, cette stratégie est faussée par la présence de ratés de combustion, ce qui risque de conduire à un mauvais phasage de l'injection : l'injecteur devrait s'ouvrir pendant la phase d'échappement sur chacun des cylindres afin que l'essence soit disponible dans la tubulure d'admission lors de l'ouverture de la soupape d'admission. Or, dans le cas d'un mauvais phasage, il s'ouvre un tour moteur trop tôt. Ceci n'empêche pas le moteur de fonctionner, mais ses performances peuvent être dégradées. Dans le cas d'un fonctionnement moteur mal phase, lorsque l'on détecte un défaut sur un cylindre grâce à la stratégie de détection misfire, c'est en réalité l'autre cylindre de la même paire qui est réellement en défaut. Il s'ensuit que si le moteur possède un de ses cylindres en défaut (par exemple le cylindre 1, c'est-à-dire celui situé le plus proche de l'embrayage), le cylindre qui sera déclaré en défaut est le cylindre de la même paire (dans notre exemple, le cylindre numéro 4) . Si l'on exécute alors une coupure d'injection sur le cylindre détecté défaillant, le moteur aura en réalité deux cylindres qui ne brûleront plus : celui qui était en défaut (le 1) et celui sur lequel l'injection a été coupée (le 4).In the case of an application on an engine lacking an injection phasing system by means of a position reading sensor on the camshaft or by a physical phasing control means (for example sensors in the combustion chamber), this phasing is carried out by a software strategy. However, this strategy is distorted by the presence of misfires, which risks leading to poor phasing of the injection: the injector should open during the exhaust phase on each of the cylinders so that the petrol is available in the intake manifold when opening the intake valve. However, in the case of poor phasing, it opens an engine revolution too early. This does not prevent the engine from running, but its performance may be degraded. In the case of poor phase motor operation, when a fault on a cylinder is detected using the misfire detection strategy, it is actually the other cylinder of the same pair which is really in fault. It follows that if the engine has one of its faulty cylinders (for example cylinder 1, that is to say the one located closest to the clutch), the cylinder which will be declared faulty is the cylinder of the same pair (in our example, cylinder number 4). If an injection cut is then performed on the faulty cylinder detected, the engine will in reality have two cylinders which will no longer burn: the one which was faulty (the 1) and the one on which the injection was cut (the 4).
On voit donc que l'on ne peut effectuer la coupure d'injection sur une application dont le phasage d'injection s'effectue de façon logicielle, sans s'assurer de la justesse du phasage.It can therefore be seen that the injection cut-off cannot be carried out on an application whose injection phasing is carried out in software, without ensuring the correctness of the phasing.
L'état de l'art existant montre certaines méthodes permettant de couper l'injection sur des cylindres détectés comme défaillants, mais aucune ne permet de contrôler le phasage de l'injection dans le cas de moteurs dépourvus de capteurs pouvant effectuer le contrôle du phasage, ou en cas de panne d'un tel capteur.The existing state of the art shows certain methods making it possible to cut the injection on cylinders detected as faulty, but none makes it possible to control the phasing of the injection in the case of engines devoid of sensors capable of performing the phasing control. , or in case of failure of such a sensor.
L'invention vise à remédier à cette lacune. L'invention propose donc un procédé pour préserver le catalyseur d'un moteur à allumage commandé, en cas de ratés de combustion. Selon une caractéristique générale de l'invention, le procédé comprend une phase de détection de ratés de combustion sur les cylindres appariés du moteur, et un mode dégradé dans lequel, en présence d'un cylindre détecté en défaut et de son cylindre apparié détecté comme n' étant pas en défaut et en absence d' une information externe de contrôle du phasage moteur (cette absence résultant d'une absence de capteur ou bien d'un capteur en panne), on effectue un contrôle du phasage de l'injection de façon à déterminer lequel de ces deux cylindres est réellement en défaut.The invention aims to remedy this shortcoming. The invention therefore provides a method for preserving the catalyst of a spark-ignition engine in the event of misfires. According to a general characteristic of the invention, the method comprises a phase of detection of misfires on matched cylinders of the engine, and a degraded mode in which, in the presence of a detected cylinder in fault and its paired cylinder detected as not being in default and in the absence of external information for controlling the motor phasing (this absence resulting from the absence of a sensor or else from a faulty sensor), a phasing control of the injection of to determine which of these two cylinders is actually faulty.
Selon un mode de mise en œuvre de l'invention, le contrôle du phasage de l'injection comporte :According to an embodiment of the invention, the control of the phasing of the injection comprises:
- une coupure de l'injection sur le cylindre détecté en défaut, - un comptage, à chaque allumage sur le cylindre apparié et pendant un horizon . de mesure déterminé, du nombre, de ratés de combustion détectés sur ce cylindre apparié, et- a cut in the injection on the faulty cylinder detected, - a count, each time the ignition is made on the paired cylinder and for a horizon. determined measurement of the number of misfires detected on this paired cylinder, and
- une comparaison de ce nombre avec une valeur calibrée.- a comparison of this number with a calibrated value.
Si le contrôle du phasage révèle que le cylindre réellement en défaut est le cylindre apparié, on rétablit l'injection sur le cylindre initialement détecté en défaut, on effectue un rephasage du moteur, et on coupe l'injection sur le cylindre apparié qui est réellement en défaut.If the phasing check reveals that the cylinder really in fault is the paired cylinder, the injection is restored on the cylinder initially detected in fault, the engine is rephased, and the injection is cut on the paired cylinder which is actually in default.
En présence de deux cylindres d'une même paire détectés en défaut, on coupe avantageusement l'injection sur ces deux cylindres, etIn the presence of two cylinders of the same pair detected in default, the injection on these two cylinders is advantageously cut, and
. on interdit toute coupure d'injection sur un troisième cylindre, même s'il est détecté en défaut.. any injection cutout on a third cylinder is prohibited, even if it is detected as a fault.
Selon un mode de mise en œuvre de l'invention, on met en veille le mode .dégradé dans le cas où tous les cylindres sont détectés en défaut.According to an embodiment of the invention, the degraded mode is put on standby in the case where all the cylinders are detected as faulty.
On effectue avantageusement une remise d'injection sur des cylindres pour lesquels on avait effectué une coupure d'injection, dans des conditions stables du moteur. Par ailleurs, on limite de préférence le nombre de remises d'injections au ralenti.Advantageously, an injection reset is carried out on cylinders for which an injection cutoff was made, under stable engine conditions. Furthermore, it is preferable to limit the number of deliveries of injections at idle speed.
Selon un mode de réalisation de l'invention, lorsqu'un défaut sur un ou plusieurs cylindres est constaté au ralenti, on ne coupe pas l'injection sur ce ou ces cylindres.According to one embodiment of the invention, when a fault on one or more cylinders is observed at idling, the injection is not cut off on this or these cylinders.
D'autres avantages et caractéristiques de l'invention apparaîtront à l'examen de la description détaillée d'un mode de mise en œuvre, nullement limitatif, et des dessins annexés sur lesquels :Other advantages and characteristics of the invention will appear on examining the detailed description of an implementation mode, which is in no way limitative, and the appended drawings in which:
- les figures 1 à 3 illustrent schématiquement les principales étapes d'un mode de mise en œuvre du procédé selon l'invention.- Figures 1 to 3 schematically illustrate the main steps of an embodiment of the method according to the invention.
Le procédé comprend une phase de détection de ratés de combustion sur les cylindres du moteur et sur un horizon limité de révolution.The method includes a phase of detection of misfires on the engine cylinders and on a limited horizon of revolution.
A la fin de chaque horizon de mesure (étape 10, figure 1), la phase de détection fournit les informations suivantes (étapes 10, 11 etAt the end of each measurement horizon (step 10, Figure 1), the detection phase provides the following information (steps 10, 11 and
12, figure 1 : i12, figure 1: i
- fin d'horizon détecté,- end of horizon detected,
- panne "ratés de combustions" détectée, c'est-à-dire un taux important (déterminé en phase de mise au point du moteur, en fonction de la température générée dans le catalyseur par l'absence de combustion) de ratés de combustion sur l'horizon de mesure,- detected "misfire" failure, that is to say a significant rate (determined during the engine development phase, as a function of the temperature generated in the catalyst by the absence of combustion) of misfire on the measurement horizon,
- taux de ratés de combustion détecté sur chacun des cylindres ou numéro des cylindres sur lesquels le taux détecté est supérieur à un seuil déterminé. De plus, cette phase fournit à chaque point mort haut la présence ou non d'un raté de combustion, et l'état en diagnostic ou non de cette stratégie de détection.- misfire rate detected on each of the cylinders or number of cylinders on which the detected rate is greater than a determined threshold. In addition, this phase provides at each top dead center the presence or absence of a misfire, and the diagnostic status or not of this detection strategy.
Outre cette phase de détection, le procédé selon l'invention comporte un mode dégradé, plus particulièrement illustré sur la figure 2.In addition to this detection phase, the method according to the invention includes a degraded mode, more particularly illustrated in FIG. 2.
Lorsqu'un ou plusieurs horizons de détection sont détectés en défaut, la stratégie de mode dégradé est activée. Ce nombre est un paramètre réglable, qui doit être déterminé en fonction de la rapidité avec laquelle on souhaite voir le mode dégradé s'activer, et de la robustesse de celui-ci.When one or more detection horizons are detected in default, the degraded mode strategy is activated. This number is an adjustable parameter, which must be determined according to the speed with which we want to see the degraded mode activate, and the robustness of it.
La stratégie (étape 20) contrôle alors les cylindres détectés en défaut (cylindres dont les taux de misfires dépassent un seuil calibré). Dans le cas d'une application sur un moteur équipé d'un moyen de contrôle de la synchronisation moteur par un capteur (par exemple un capteur arbre à cames), l'injection est coupée sur les cylindres en défaut. En effet, l'essence injectée et non brûlée est responsable de la hausse de température dans le catalyseur, la coupure d'injection réduit donc les risques de destruction du catalyseur. Les cylindres détectés défaillants ne produisant pas de couple, la coupure d'injection ne crée pas de risque sécuritaire pour le conducteur. Pour plus de précaution, on limite le nombre de cylindres coupés à 2.The strategy (step 20) then checks the cylinders detected as faulty (cylinders whose misfire rates exceed a calibrated threshold). In the case of an application on an engine equipped with a means of controlling engine synchronization by a sensor (for example a camshaft sensor), the injection is cut off on the faulty cylinders. Indeed, the gasoline injected and not burned is responsible for the temperature rise in the catalyst, the cut of injection thus reduces the risks of destruction of the catalyst. As the detected faulty cylinders do not produce torque, the injection cut does not create a safety risk for the driver. For more precaution, the number of cut cylinders is limited to 2.
Dans le cas d'une application dépourvue d'un capteur permettant de contrôler le phasage moteur (ou en cas de panne de ceIn the case of an application without a sensor to control the engine phasing (or in case of failure of this
• capteur, . si le moteur en est pourvu), si . un cylindre est détecté en défaut mais que son cylindre apparié en est exempt (étape 21), le contrôle du phasage peut s'effectuer (étape 24).• sensor,. if the engine is fitted), if. a cylinder is detected as faulty but its paired cylinder is free of it (step 21), the phasing control can be carried out (step 24).
Pour cela, l'injection est coupée sur le cylindre détecté en défaut (étape 22).For this, the injection is cut on the faulty cylinder detected (step 22).
Lorsque l'injection est coupée sur le(s) cylindre(s) en défaut (étape 23), on compte, à chaque allumage sur le cylindre qui lui est apparié, et pendant un horizon de mesure déterminé, le nombre de ratés de combustions détectés sur celui-ci. Si ce cylindre (qui était exempt de défaut) a un taux de misfires supérieur à une valeur calibrée, le cylindre coupé n'est pas celui qui a. été détecté en défaut, mais le cylindre qui lui est apparié.When the injection is cut on the faulty cylinder (s) (step 23), the number of misfires during each ignition on the cylinder which is matched to it is counted, and during a determined measurement horizon detected on it. If this cylinder (which was free of defect) has a misfires rate higher than a calibrated value, the cut cylinder is not the one that has. has been detected in default, but the cylinder which has been matched to it.
Le phasage de l'injection était donc erroné : le cylindre détecté en défaut est le cylindre apparié à celui réellement détecté comme défaillant.The phasing of the injection was therefore erroneous: the cylinder detected in fault is the cylinder matched to that actually detected as faulty.
Il faut donc rephaser le moteur (c'est-à-dire décaler d'un tour moteur le motif d'injection).The engine must therefore be rephased (that is to say, shift the injection pattern by one engine revolution).
L'injection est rétablie pendant le processus de rephasage (étape 25) afin de préserver les performances résiduelles du véhicule, et le moteur est rephasé (étape 26) (décalage progressif de l'injection jusqu'à obtention du bon phasage temporel de l'injection).The injection is restored during the rephasing process (step 25) in order to preserve the residual performance of the vehicle, and the engine is rephased (step 26) (progressive shift of the injection until the correct timing of the injection is obtained).
L'injection sur le cylindre en défaut peut alors être coupée lorsque le rephasage est terminé (étape 27). Si deux cylindres d'une même paire sont détectés défaillants, l'injection est effectuée sur les deux cylindres (étape 28), le contrôle du phasage n'est alors pas possible. L'injection est alors coupée sur la paire de cylindres en défaut puisque la problématique du phasage ne se pose pas. Il devient alors impossible de couper n troisième cylindre, même si l'on détecte un défaut sur un autre cylindre, et ce afin d'assurer la sécurité du véhicule.The injection on the faulty cylinder can then be cut off when the rephasing is finished (step 27). If two cylinders of the same pair are detected faulty, the injection is carried out on the two cylinders (step 28), the phasing control is then not possible. The injection is then cut on the faulty pair of cylinders since the problem of phasing does not arise. It then becomes impossible to cut a third cylinder, even if a fault is detected on another cylinder, in order to ensure the safety of the vehicle.
Il est possible qu'à la fin de l'horizon de mesure un défaut "ratés de combustion susceptible d'endommager le catalyseur" soit déclaré sans qu'il y ait pour autant un ou plusieurs cylindres détectés en défaut. Cela signifie alors que des ratés de combustion apparaissent sur tous les cylindres. Cela peut en particulier être le cas lors d'un problème d'alimentation en carburant. Dans ce cas, la stratégie est mise en attente (pas de coupure d'injection) jusqu'à ce que l'on détecte une configuration dans laquelle la coupure peut être effectuée (au moins un cylindre qui ne brûle pas).It is possible that at the end of the measurement horizon a "misfire" which could damage the catalyst "is declared without there being one or more cylinders detected as a fault. This then means that misfires appear on all the cylinders. This can in particular be the case during a fuel supply problem. In this case, the strategy is put on hold (no injection cut) until a configuration in which the cut can be detected (at least one cylinder which does not burn) is detected.
De même, il est possible que tous les cylindres soient détectés défaillants (il s'agit du même type de problème que celui mentionné plus haut, mais avec un taux d'apparition des ratés plus important.Likewise, it is possible that all the cylinders are detected to be faulty (this is the same type of problem as that mentioned above, but with a higher rate of occurrence of misfires.
Dans ce cas, le mode dégradé est mis en veille comme mentionné ci- dessus.In this case, the degraded mode is put on standby as mentioned above.
Dans la mesure où le mode dégradé provoque un défaut misfire, il n'est pas possible de faire disparaître le défaut lorsque la coupure d'injection a été réalisée. Afin de permettre la sortie du mode dégradé si le défaut disparaît, il est nécessaire de revenir dans des conditions de fonctionnement normal (c'est-à-dire en injectant sur tous les cylindres), dans des zones de fonctionnement moteurs pour lesquels les ratés de combustion ne présentent pas de risques majeurs pour le catalyseur, ce qui est le cas notamment du ralenti. Ainsi, lorsque le moteur fonctionne au ralenti, l'injection est remise sur les cylindres en défaut, afin de contrôler si le défaut est toujours présent, auquel cas l'injection est de nouveau coupée sur le(s) cylindre(s) en défaut. Dans le cas contraire, le mode dégradé est arrêté jusqu'à une nouvelle apparition du défaut. Afin d'éviter les phénomènes cycliques (injection/coupure d'injection), il est préférable de prendre les précautions suivantes.Since the degraded mode causes a misfire fault, it is not possible to clear the fault when the injection cut-out has been performed. In order to allow the exit from degraded mode if the fault disappears, it is necessary to return to normal operating conditions (that is to say by injecting on all the cylinders), in engine operating zones for which the misfires combustion pose no major risks to the catalyst, which is the case in particular with idling. Thus, when the engine is idling, the injection is returned to the cylinders in fault, in order to check whether the fault is still present, in which case the injection is cut again on the faulty cylinder (s). Otherwise, the degraded mode is stopped until the fault reappears. In order to avoid cyclical phenomena (injection / injection cut-off), it is preferable to take the following precautions.
La remise de l'injection (figure 3) ne doit s'effectuer que dans des conditions stables du moteur (en particulier, la stratégie de détection des ratés de combustion doit être active, sans quoi, les ratés de combustion peuvent durer trop longtemps et endommager le catalyseur.The delivery of the injection (Figure 3) should only be carried out under stable engine conditions (in particular, the misfire detection strategy must be active, otherwise the misfire may last too long and damage the catalyst.
Le mode dégradé n'est pas activé dans les conditions permettant la remise d'injection pour la confirmation du défaut : ceci permet d'éviter de remettre de l'injection sur les cylindres qui viennent d'être coupés. Lorsqu'un défaut est constaté au ralenti, l'injection n'est pas coupée, puisque ce mode de fonctionnement autorise la sortie du mode dégradé pour un contrôle du défaut ;Degraded mode is not activated under the conditions allowing delivery of injection for confirmation of the fault: this makes it possible to avoid delivering injection to the cylinders which have just been cut. When a fault is observed at idle, the injection is not cut, since this operating mode authorizes the exit from the degraded mode for checking the fault;
Il convient également de limiter le nombre de tentatives de remise d'injection au ralenti : au bout d'un certain nombre (ajustable) de tentatives de remises d'injection pour lesquelles le défaut est confirmé, le mode dégradé est définitivement confirmé jusqu'à la coupure moteur. En effet, au bout d'un certain nombre de tentatives, on peut estimer que le défaut n'est pas un défaut passager. Dans ce cas, il devrait persister jusqu'à l'arrêt du véhicule. II faut s'assurer qu'un horizon de détection complet se déroule avec le mode dégradé désactivé, sinon le défaut détecté correspond à la coupure d'injection provoquée.The number of attempts to reset injection to idle should also be limited: after a certain (adjustable) number of attempts to reset injection for which the fault is confirmed, the degraded mode is definitively confirmed until engine shutdown. Indeed, after a certain number of attempts, it can be estimated that the fault is not a transient fault. In this case, it should persist until the vehicle stops. It must be ensured that a complete detection horizon takes place with the degraded mode deactivated, otherwise the detected fault corresponds to the injection cut off caused.
Lors de l'arrêt du véhicule, la stratégie est initialisée. Il n'est tenu aucun compte du roulage précédent. Il faut attendre l'apparition du défaut pour provoquer la coupure d'injection sur le(s) cylindre(s) défaillant(s) . When the vehicle stops, the strategy is initialized. No account is taken of the previous taxiing. It is necessary to wait for the appearance of the fault to cause the injection cut off on the faulty cylinder (s).

Claims

REVENDICATIONS
1. Procédé pour préserver le catalyseur d'un moteur à allumage commandé, en cas de ratés de combustion, caractérisé par le fait qu'il comprend une phase de détection de ratés de combustion sur les cylindres appariés du moteur, et un mode dégradé dans lequel, en présence (20) d'un cylindre détecté en défaut et de son cylindre apparié détecté comme n'étant pas en défaut et en absence d'une information externe de contrôle du phasage moteur, on effectue un contrôle (24) du phasage de l'injection de façon à déterminer lequel de ces deux cylindres est réellement en défaut.1. Method for preserving the catalyst of a spark-ignition engine, in the event of misfires, characterized in that it comprises a phase of detection of misfires on the matched cylinders of the engine, and a degraded mode in which, in the presence (20) of a cylinder detected as faulty and of its paired cylinder detected as not being in default and in the absence of external engine phasing control information, a phasing control (24) is carried out of the injection so as to determine which of these two cylinders is actually at fault.
2. Procédé selon la revendication 1 , caractérisé par le fait que le contrôle (24) du phasage de l'injection comporte une coupure de l'injection sur le cylindre détecté en défaut, un comptage, à chaque allumage sur. le . cylindre, apparié et pendant. - un horizon de mesure déterminé, du nombre de ratés de combustion détectés sur ce cylindre apparié, et une comparaison de ce nombre avec une valeur calibrée.2. Method according to claim 1, characterized in that the control (24) of the phasing of the injection comprises a cut of the injection on the cylinder detected in default, a count, with each ignition on. the . cylinder, paired and pendant. - a determined measurement horizon, of the number of misfires detected on this paired cylinder, and a comparison of this number with a calibrated value.
3. Procédé selon la revendication 1 ou 2, caractérisé par le fait que si le contrôle (24) du phasage révèle que le cylindre réellement en défaut est le cylindre apparié, on rétablit (25) l'injection sur le cylindre initialement détecté en défaut, on effectue un rephasage (26) du moteur, et on coupe (27) l'injection sur le cylindre apparié qui est réellement en défaut.3. Method according to claim 1 or 2, characterized in that if the control (24) of the phasing reveals that the cylinder really in default is the paired cylinder, the injection is restored (25) on the cylinder initially detected in default , a rephasing (26) of the engine is carried out, and the injection is cut (27) on the paired cylinder which is actually at fault.
4. Procédé selon l'une des revendications précédentes, caractérisé par le fait qu' en présence de deux cylindres d'une même paire détectés en défaut, on coupe (28) l'inj ection sur ces deux cylindres, et on interdit toute coupure d'injection sur un troisième cylindre même s'il est détecté en défaut.4. Method according to one of the preceding claims, characterized in that in the presence of two cylinders of the same pair detected in default, the injection is cut (28) on these two cylinders, and any cutting is prohibited injection on a third cylinder even if it is detected in default.
5. Procédé selon l'une des revendications précédentes, caractérisé par le fait qu' on met en veille le mode dégradé dans le cas où tous les cylindres sont détectés en défaut.5. Method according to one of the preceding claims, characterized in that the degraded mode is put on standby in the event that all the cylinders are detected as faulty.
6. Procédé selon l'une des revendications précédentes, caractérisé par le fait qu' on effectue une remise d'injection sur des cylindres pour lesquels on avait effectué une coupure d'injection, dans des conditions stables du moteur.6. Method according to one of the preceding claims, characterized in that an injection reset is carried out on cylinders for which an injection cut had been carried out under stable engine conditions.
7. Procédé selon la revendication 6, caractérisé par le fait qu' on limite le nombre de remise d'injection au ralenti.7. Method according to claim 6, characterized in that the number of injection reset is limited at idle.
8. Procédé selon l'une des revendications précédentes, caractérisé par le fait que lorsqu'un défaut sur un ou plusieurs cylindre est constaté au ralenti, on ne coupe pas l'injection sur ce ou ces cylindres. 8. Method according to one of the preceding claims, characterized in that when a defect in one or more cylinders is observed at idling, the injection is not cut on this or these cylinders.
EP03778423A 2002-10-18 2003-10-20 Method for protecting a spark ignition engine catalyst in case of combustion misfiring Expired - Lifetime EP1585894B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0213010A FR2846050B1 (en) 2002-10-18 2002-10-18 METHOD FOR PRESERVING CATALYST OF CONTROLLED IGNITION ENGINE IN CASE OF COMBUSTION RATES
FR0213010 2002-10-18
PCT/FR2003/003117 WO2004036018A1 (en) 2002-10-18 2003-10-20 Method for protecting a spark ignition engine catalyst in case of combustion misfiring

Publications (2)

Publication Number Publication Date
EP1585894A1 true EP1585894A1 (en) 2005-10-19
EP1585894B1 EP1585894B1 (en) 2011-09-14

Family

ID=32050525

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03778423A Expired - Lifetime EP1585894B1 (en) 2002-10-18 2003-10-20 Method for protecting a spark ignition engine catalyst in case of combustion misfiring

Country Status (4)

Country Link
EP (1) EP1585894B1 (en)
ES (1) ES2372932T3 (en)
FR (1) FR2846050B1 (en)
WO (1) WO2004036018A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101861453B (en) * 2008-12-26 2013-01-16 丰田自动车株式会社 Device for controlling internal combustion engine using variable valve mechanism
DE102009000444A1 (en) * 2009-01-28 2010-07-29 Robert Bosch Gmbh Apparatus and method for operating an internal combustion engine, computer program, computer program product

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4002210C2 (en) * 1990-01-26 1999-10-14 Bosch Gmbh Robert Method for separating an engine cylinder with combustion misfires from the fuel supply
JPH0586956A (en) * 1991-09-27 1993-04-06 Mitsubishi Electric Corp Missfire detecting device for internal combustion engine
US5577475A (en) * 1994-12-12 1996-11-26 Saturn Corporation Engine synchronization
DE10006004C1 (en) * 2000-02-11 2000-11-09 Bosch Gmbh Robert Misfire detection in multicylinder engines involves comparing rough running values for simultaneously ignited cylinders with value lower than for individually ignited cylinders

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004036018A1 *

Also Published As

Publication number Publication date
FR2846050A1 (en) 2004-04-23
EP1585894B1 (en) 2011-09-14
WO2004036018A1 (en) 2004-04-29
FR2846050B1 (en) 2006-10-06
ES2372932T3 (en) 2012-01-27

Similar Documents

Publication Publication Date Title
FR2699604A1 (en) Method for detecting a leak in the injectors of a heat engine.
FR2725242A1 (en) DEVICE FOR DETECTING THE BACK RETURN OF A ROTARY PART OF AN INTERNAL COMBUSTION ENGINE
EP0686762A1 (en) Method and apparatus for determining specific parameters of injectors for combustion engines, in particular diesel engines with pre-injection
EP1585894B1 (en) Method for protecting a spark ignition engine catalyst in case of combustion misfiring
EP0127510A1 (en) Method of interrupting fuel injection into an internal-combustion engine during deceleration
EP1613850B1 (en) Method for synchronizing injection with the engine phase in an engine with electronic controlled injectors
EP3724457B1 (en) Method for detecting the ignition of a turbine engine
Klein et al. Spark ignition engine hydrocarbon emissions behaviors in stopping and restarting
FR3069279A1 (en) METHOD FOR STARTING A REGENERATION OF A PARTICLE FILTER
FR2837529A1 (en) Engine overheating protection system includes temperature sensor in exhaust linked to control cutting fuel supply
FR3107930A1 (en) Engine computer and associated engine control method
FR3110200A1 (en) Device and method for detecting a failure of an internal combustion engine for a motor vehicle
FR3034469A1 (en) VEHICLE DIAGNOSTIC METHOD ON A VEHICLE RELATING TO A PRESSURE FAILURE OF THE CYLINDER PRESSURE
WO2024083788A1 (en) Method for managing a restart phase of an internal combustion engine in degraded mode
FR2938606A3 (en) Fuel injection system operating method for combustion engine i.e. direct injection oil engine, of motor vehicle, involves closing controlled valve if fuel pressure is lower than pressure threshold
JPH1061472A (en) Control device for diesel engine
EP2329122B1 (en) Method for starting an internal combustion engine
FR3048265A1 (en) METHOD FOR CONTROLLING THE COMBUSTION OF A THERMAL ENGINE BY ADAPTING THE FUEL INJECTION
FR2762358A1 (en) Control of operation of diesel engine fitted to motor vehicle
FR2906592A1 (en) Exhaust gas recirculation valve failure managing method for motor vehicle`s oil engine, involves sending valve opening instruction when failure is blockage of valve or based on engine operating conditions, and sending closing instruction
KR100494905B1 (en) Method protecting reverse rotation for electronic control diesel engine
EP4291768A1 (en) A method for starting an ic engine of a vehicle and system thereof
KR100476229B1 (en) Apparatus for back fire holding when of the ignition on engine and method thereof
FR2782540A1 (en) Method of control of internal combustion engine to cut fuel supply if electric ignition is interrupted, avoiding damage to catalytic converter
JPH08218928A (en) Excessive rotation preventing device for engine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20050426

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK

DAX Request for extension of the european patent (deleted)
RBV Designated contracting states (corrected)

Designated state(s): BE DE ES GB IT

RIN1 Information on inventor provided before grant (corrected)

Inventor name: RENOU, LOUIS

Inventor name: PINEAU, ANTOINE

Inventor name: CHANDONNAY, JEROME

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE ES GB IT

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 60338399

Country of ref document: DE

Effective date: 20111117

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2372932

Country of ref document: ES

Kind code of ref document: T3

Effective date: 20120127

BERE Be: lapsed

Owner name: RENAULT S.A.S.

Effective date: 20111031

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20111031

26N No opposition filed

Effective date: 20120615

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 60338399

Country of ref document: DE

Effective date: 20120615

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20171121

Year of fee payment: 15

Ref country code: IT

Payment date: 20171023

Year of fee payment: 15

Ref country code: GB

Payment date: 20171019

Year of fee payment: 15

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20181020

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181020

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181020

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20191202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181021

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20211020

Year of fee payment: 19

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 60338399

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230503