EP1478838B1 - Method and device for diagnosing the operating condition of an internal combustion engine exhaust gas recycling valve - Google Patents

Method and device for diagnosing the operating condition of an internal combustion engine exhaust gas recycling valve Download PDF

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Publication number
EP1478838B1
EP1478838B1 EP03732622A EP03732622A EP1478838B1 EP 1478838 B1 EP1478838 B1 EP 1478838B1 EP 03732622 A EP03732622 A EP 03732622A EP 03732622 A EP03732622 A EP 03732622A EP 1478838 B1 EP1478838 B1 EP 1478838B1
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EP
European Patent Office
Prior art keywords
valve
reference value
difference
detection
exhaust gas
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Expired - Fee Related
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EP03732622A
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German (de)
French (fr)
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EP1478838A1 (en
Inventor
Stéphane Bourret
Laurent Leprieur
Olivier Meurisse
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Renault SAS
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Renault SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/55—Systems for actuating EGR valves using vacuum actuators
    • F02M26/56—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves
    • F02M26/57—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves using electronic means, e.g. electromagnetic valves
    • 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
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0414—Air temperature
    • 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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor

Definitions

  • the present invention relates to a method for diagnosing the operating state of an exhaust gas recirculation valve of an internal combustion engine, and a corresponding diagnostic device.
  • Motor vehicles and in particular diesel type motor vehicles, are often equipped with an exhaust gas recirculation circuit for injecting the exhaust gases into the engine intake manifold.
  • the inert cylinders are injected into the cylinders of the engine, which make it possible to reduce the amount of nitrogen oxide produced by the engine.
  • This recirculation is likely to increase significantly the amount of smoke in the exhaust gas if it is not properly adjusted and, in particular, if the amount of recirculated exhaust gas is too large.
  • the exhaust gas recirculation circuit is provided with a recirculated gas flow control valve.
  • An electronic computer responsible for managing the amount of fuel to be injected into the engine cylinders, controls the regulating valve to regulate the percentage of recirculated gases.
  • the diagnosis or the check of the good functioning of the exhaust gas recirculation valve is carried out by comparing fresh air flow instructions provided by the electronic computer with measurements provided by a corresponding flow meter or alternatively , by comparing the position setpoint of the recirculation valve supplied by the computer to a position measured by a measurement potentiometer.
  • a malfunction occurs when the difference between a measured value and a corresponding reference value is greater than a predetermined threshold value.
  • the fresh air flow setpoint becomes important and, if this setpoint is insufficiently mapped within the computer, the measured air flow can not reach this setpoint. This results in a persistent gap between the value of the setpoint and the value of the measured airflow, which is interpreted by the computer as a blocking of the valve in the open position.
  • this technique is capable of generating non-detections of dysfunction. Indeed, when a clear acceleration is requested by the driver, the computer requires a cut of the regulation of the amount of recirculated gas, and no regulation is then carried out, as regards the recirculation of the exhaust gas. Therefore, if the valve has not closed properly, the computer is not able to detect such a malfunction.
  • the use of a potentiometer to measure the position of the valve requires a learning of the position closed valve because of the manufacturing tolerances of the valves and potentiometers of measurement, the manufacturing tolerances of the valve being relatively large compared to that of the potentiometer.
  • this learning is necessitated by the temperature sensitivity of the potentiometer and the valve body, which causes a variation of the position measurements of the valve as a function of temperature.
  • Such learning is usually done every time the engine is started, before allowing the valve to open and regulating and then closing each valve, in order to take into account the evolution of the position corresponding to the valve closed according to the temperature.
  • the object of the invention is therefore to overcome the aforementioned drawbacks.
  • a method for diagnosing the operating state of an exhaust gas recirculation valve of an internal combustion engine comprising the acquisition of a measurement value of 'a reference position of the recirculation valve at a predetermined time corresponding to a normally closed position of the valve, calculating the difference between the acquired reference value and a reference value acquired during a previously performed diagnostic cycle and a comparison of the calculated difference with a threshold value of detection of the opening of the valve.
  • the difference between the reference value acquired during a current diagnostic cycle and a value of reference corresponding to the same new recirculation valve and the calculated difference is compared with a threshold value of detection of a malfunction of the valve.
  • the reference value corresponding to the same new recirculation valve is acquired during the first start of the engine.
  • the opening detection and malfunction threshold values each comprise a first variable term as a function of the temperature and a second term corresponding to a detection threshold independent of the temperature.
  • said threshold values are variable as a function of engine operating parameters.
  • the acquired reference value is memorized during the current diagnostic cycle for a subsequent diagnostic cycle if a correct closing of the valve has been detected and there is no malfunction during this cycle. diagnosis.
  • a device for diagnosing the operating state of an exhaust gas recirculation valve of an internal combustion engine for the implementation of a method as defined above.
  • This device comprises means for measuring the position of the valve connected to a central processing unit to deliver to the latter a measurement value of the reference position of the valve, the central unit comprising means for calculating the difference between the reference value and a reference value acquired during a diagnostic cycle previously carried out and means for comparing the calculated difference with a threshold value for detecting the opening of the valve.
  • the central unit comprises means for calculating the difference between the reference value and a reference value corresponding to the same new recirculation valve and means for comparing the calculated difference with a value threshold of detection of a malfunction of the valve.
  • the means for measuring the position of the valve comprise a measuring potentiometer.
  • FIG. 1 diagrammatically shows the general structure of an internal combustion engine of a motor vehicle, designated by the general reference numeral 10.
  • the motor 10 is provided with four cylinders 12 in line.
  • the cylinders 12 are supplied with air via an intake distributor 14, itself fed by a pipe 16 provided with an air filter (not shown) and a turbocharger 18 of the engine air supercharger.
  • An exhaust manifold 20 recovers the exhaust gases from the combustion and discharges these outwards through the turbocharger, and through an exhaust line 22.
  • the exhaust gas recirculation circuit comprising a portion of the air supply circuit of the engine and a portion of the exhaust circuit, serves to reinject a portion of the exhaust gas into the intake manifold 14, in particular, to limit the amount of nitrogen oxide produced while avoiding the formation of smoke in the exhaust gas.
  • This recirculation circuit essentially comprises an exhaust gas recirculation valve, designated by the general reference numeral 24.
  • the motor 10 is provided with a computer 26 duly programmed to control the operation of the engine 10, in particular for adjusting its operating parameters, as well as for the diagnosis of the operation of the recirculation valve 24.
  • the central unit 26 is connected to a set of sensors, such as, in particular, a boost pressure sensor 28, an air intake temperature sensor 30 in the intake manifold 14, and a flow sensor 32 fitted to the feed pipe 16.
  • sensors such as, in particular, a boost pressure sensor 28, an air intake temperature sensor 30 in the intake manifold 14, and a flow sensor 32 fitted to the feed pipe 16.
  • a measurement potentiometer (not shown) making it possible to measure the angular displacement of the valve when it is a question of a flap, or the linear displacement of this valve when it is a valve, between its open position and its closed position.
  • the central unit 26 includes, stored in memory, valve opening detection threshold values, as well as malfunction detection threshold values, and incorporates all the means software allowing it to proceed, on the one hand, to a control of the valve to obtain an optimized amount of recirculated gas and, on the other hand, to a control of the closure of the valve or to a detection of a blockage at the opening of the latter and, in general, to a detection of malfunctions, as will now be described later.
  • the central unit 26 proceeds to acquire a value of measuring the position of the recirculation valve, in an operating zone in which the valve normally closed.
  • this diagnostic cycle is carried out each time the engine is started or each time the valve is closed.
  • this reference value which is delivered by the measuring potentiometer which is provided with the valve, is acquired at a time when it is expected that the valve is closed. It is acquired at the start of the engine, before allowing any control of the valve on opening, and after each closing order of the valve, so as to compensate for the expansion of the valve body and the potentiometer generated under the effect of the temperature of the exhaust gas.
  • the blocking detection of the valve is made in the open position, or in other words, it is checked that the reference position corresponds to a closed position of the valve.
  • the central unit 26 proceeds with a calculation of the difference between the reference value acquired during the current diagnostic cycle and a reference value acquired during a diagnostic cycle previously performed and corresponding to an absence. malfunction.
  • the threshold value used for the detection of the blockage of the opening of the recirculation valve 24 comprises a first variable term as a function of the temperature of the exhaust gases, as well as a second independent term of the temperature.
  • a second diagnosis is performed in order to determine the fouling of the valve or, in general, to detect any malfunction of the valve.
  • the computer 26 calculates the difference between the reference value acquired during this diagnostic cycle and a measurement reference value corresponding to the same new or unclassed valve.
  • this measurement reference value is acquired during the first start of the engine.
  • the threshold used to carry out this second diagnosis is also preferably composed of a first variable term as a function of the temperature, and a second term corresponding to a detection threshold independent of the temperature.
  • the thresholds indicated above for performing the diagnosis of the operating state of the valve are preferably constituted by variable threshold values as a function of the operating parameters of the engine, in particular with regard to the second term.
  • this can be developed from a temperature measurement of the recirculated exhaust gas, and then from a treatment carried out within the central unit 26.
  • this first variable term depending on the temperature it is also possible to process the acquired reference value as a function of the temperature of the exhaust gas.
  • this second diagnostic step 42 if it is detected that the recirculation valve is effectively closed and that its operation is correct, the reference value of the current cycle is stored in memory in the central unit. to be used in a subsequent diagnostic cycle.
  • step 46 the valve is controlled according to a set value delivered by the central unit 26.
  • the procedure returns to the previously mentioned step 34, after expiration of a predetermined period of time, corresponding to the closing time of the valve (step 48).

Abstract

The invention concerns a method for diagnosing the operating condition of an internal combustion engine exhaust gas recycling valve (24) which consists in: acquiring a measurement value of a reference position of the recycling valve (24) at a predetermined time corresponding to a normally closed position of the valve, calculating the difference between the acquired reference value and a reference value acquired during the diagnostic cycle previously carried out and comparing the calculated difference with a threshold value for detecting opening of the valve (24).

Description

La présente invention concerne un procédé de diagnostic de l'état de fonctionnement d'une vanne de recirculation de gaz d'échappement d'un moteur à combustion interne, ainsi qu'un dispositif de diagnostic correspondant.The present invention relates to a method for diagnosing the operating state of an exhaust gas recirculation valve of an internal combustion engine, and a corresponding diagnostic device.

Les véhicules automobiles, et en particulier les véhicules automobiles de type Diesel, sont souvent équipés d'un circuit de recirculation des gaz d'échappement destiné à réinjecter les gaz d'échappement dans le collecteur d'admission du moteur.Motor vehicles, and in particular diesel type motor vehicles, are often equipped with an exhaust gas recirculation circuit for injecting the exhaust gases into the engine intake manifold.

On sait en effet qu'une telle recirculation permet de diminuer les émissions d'oxyde d'azote du moteur, qui sont des espèces chimiques particulièrement nocives. La quantité d'oxyde d'azote est fortement liée à là composition du mélange réactif dans les cylindres du moteur -en air, en carburant, et à la présence de gaz inertes.It is known that such a recirculation makes it possible to reduce the emissions of nitrogen oxide from the engine, which are particularly harmful chemical species. The amount of nitrogen oxide is strongly related to the composition of the reaction mixture in the engine cylinders - air, fuel, and the presence of inert gases.

Ainsi, en prévoyant une recirculation des gaz d'échappement, on injecte dans les cylindres du moteur les gaz inertes, lesquels permettent de diminuer la quantité d'oxyde d'azote produit par le moteur.Thus, by providing a recirculation of the exhaust gas, the inert cylinders are injected into the cylinders of the engine, which make it possible to reduce the amount of nitrogen oxide produced by the engine.

Cette recirculation est cependant susceptible d'accroître de manière non négligeable la quantité de fumée dans les gaz d'échappement si elle n'est pas correctement réglée et, en particulier, si la quantité de gaz d'échappement recirculés est trop importante.This recirculation, however, is likely to increase significantly the amount of smoke in the exhaust gas if it is not properly adjusted and, in particular, if the amount of recirculated exhaust gas is too large.

En outre, dans certaines conditions, en particulier lorsque le conducteur du véhicule automobile requiert une accélération franche, la recirculation des gaz d'échappement doit être coupée.In addition, under certain conditions, in particular when the driver of the motor vehicle requires a clear acceleration, the recirculation of the exhaust gas must be cut.

Ainsi, le circuit de recirculation des gaz d'échappement est pourvu d'une soupape de réglage du flux de gaz recirculés. Un calculateur électronique, chargé de gérer la quantité de carburant à injecter dans les cylindres du moteur, pilote la soupape de réglage pour réguler le pourcentage des gaz recirculés.Thus, the exhaust gas recirculation circuit is provided with a recirculated gas flow control valve. An electronic computer, responsible for managing the amount of fuel to be injected into the engine cylinders, controls the regulating valve to regulate the percentage of recirculated gases.

Classiquement, le diagnostic ou le contrôle du bon fonctionnement de la soupape de recirculation des gaz d'échappement s'effectue en comparant des consignes de débit d'air frais fournies par le calculateur électronique à des mesures fournies par un débitmètre correspondant ou, en variante, en comparant la consigne de position de la soupape de recirculation fournie par le calculateur à une position mesurée par un potentiomètre de mesure.Conventionally, the diagnosis or the check of the good functioning of the exhaust gas recirculation valve is carried out by comparing fresh air flow instructions provided by the electronic computer with measurements provided by a corresponding flow meter or alternatively , by comparing the position setpoint of the recirculation valve supplied by the computer to a position measured by a measurement potentiometer.

On considère qu'un dysfonctionnement apparaît lorsque l'écart entre une valeur mesurée et une valeur de consigne correspondante est supérieur à une valeur de seuil prédéterminée.It is considered that a malfunction occurs when the difference between a measured value and a corresponding reference value is greater than a predetermined threshold value.

On pourra se référer à cet égard au document FR 2 753 488 .In this respect reference may be made to the document FR 2 753 488 .

En ce qui concerne la surveillance du bon fonctionnement de la vanne de recirculation à partir d'une comparaison entre une consigne de débit d'air frais fournie par le calculateur et une valeur correspondante mesurée par un débitmètre, cette technique est susceptible d'engendrer des fausses détections.As regards the monitoring of the correct operation of the recirculation valve from a comparison between a fresh air flow rate setpoint supplied by the computer and a corresponding value measured by a flow meter, this technique is likely to generate problems. false detections.

En effet, lorsque le calculateur requiert une fermeture de la vanné, la consigne de débit d'air frais devient importante et, si cette consigne est insuffisamment cartographiée au sein du calculateur, le débit d'air mesuré ne peut atteindre cette consigne. Il en résulte un écart persistant entre la valeur de la consigne et la valeur du débit d'air mesuré, ce qui est interprété, par le calculateur, comme un blocage de la soupape en position ouverte.Indeed, when the computer requires closure of the valve, the fresh air flow setpoint becomes important and, if this setpoint is insufficiently mapped within the computer, the measured air flow can not reach this setpoint. This results in a persistent gap between the value of the setpoint and the value of the measured airflow, which is interpreted by the computer as a blocking of the valve in the open position.

En outre, cette technique est susceptible d'engendrer des non-détections de dysfonctionnement. En effet, lorsqu'une accélération franche est demandée par le conducteur, le calculateur requiert une coupure de la régulation de la quantité de gaz recirculés, et aucune régulation n'est alors effectuée, en ce qui concerne la recirculation des gaz d'échappement. Dès lors, si la soupape ne s'est pas correctement refermée, le calculateur n'est pas en mesure de détecter un tel dysfonctionnement.In addition, this technique is capable of generating non-detections of dysfunction. Indeed, when a clear acceleration is requested by the driver, the computer requires a cut of the regulation of the amount of recirculated gas, and no regulation is then carried out, as regards the recirculation of the exhaust gas. Therefore, if the valve has not closed properly, the computer is not able to detect such a malfunction.

Tel est également le cas lors d'un blocage de la soupape en position ouverte. Dans ce cas, le couple délivré par le moteur chute. Le conducteur peut alors demander alors une accélération franche pour compenser cette chute de couple. Si cette demande d'accélération est effectuée avant que le diagnostic n'ait été effectué, le dysfonctionnement ne sera pas détecté.This is also the case when the valve is locked in the open position. In this case, the torque delivered by the motor drops. The driver can then request a clear acceleration for compensate for this drop in torque. If this acceleration request is made before the diagnosis has been made, the malfunction will not be detected.

En ce qui concerne la surveillance du bon fonctionnement de la vanne de recirculation des gaz d'échappement à partir du contrôle de la position de cette dernière, l'utilisation d'un potentiomètre pour mesurer la position de la vanne nécessite un apprentissage de la position fermée de la vanne en raison des tolérances de fabrication des vannes et des potentiomètres de mesure, les tolérances de fabrication de la vanne étant relativement importantes par rapport à celle du potentiomètre. En outre, cet apprentissage est rendu nécessaire par la sensibilité à la température du potentiomètre et du corps de vanne, ce qui entraîne une variation des mesures de position de la vanne en fonction de la température.With regard to the monitoring of the proper functioning of the exhaust gas recirculation valve from the control of the position of the latter, the use of a potentiometer to measure the position of the valve requires a learning of the position closed valve because of the manufacturing tolerances of the valves and potentiometers of measurement, the manufacturing tolerances of the valve being relatively large compared to that of the potentiometer. In addition, this learning is necessitated by the temperature sensitivity of the potentiometer and the valve body, which causes a variation of the position measurements of the valve as a function of temperature.

Un tel apprentissage est- généralement effectué à chaque démarrage du moteur, avant d'autoriser une ouverture de la vanne et de procéder à toute régulation, puis à chaque fermeture de vanne, afin de prendre en compte l'évolution de la position correspondant à la vanne fermée en fonction de la température.Such learning is usually done every time the engine is started, before allowing the valve to open and regulating and then closing each valve, in order to take into account the evolution of the position corresponding to the valve closed according to the temperature.

Bien que le contrôle du bon fonctionnement de la vanne à partir d'une comparaison entre une mesure de la position de la vanne et une consigne de position permette de minimiser les risques de fausses détections, dans la mesure où la position maximale de fermeture de la vanne peut aisément être acquise, cette technique présente des inconvénients majeurs en ce qui concerne les non-détections de dysfonctionnements, dans la mesure où le temps global de réaction du dispositif en réponse à une commande de fermeture de la vanne peut être inférieur au temps de diagnostic d'un dysfonctionnement.Although checking the correct operation of the valve from a comparison between a measurement of the position of the valve and a position setpoint can minimize the risk of false detections, since the maximum position of closure of the valve This technique has major disadvantages with respect to the non-detection of malfunctions, since the overall reaction time of the device in response to a closing command of the valve can be less than the diagnosis of a dysfunction.

Le but de l'invention est donc de pallier les inconvénients précités.The object of the invention is therefore to overcome the aforementioned drawbacks.

Ainsi, selon l'invention, il est proposé un procédé de diagnostic de l'état de fonctionnement d'une vanne de recirculation de gaz d'échappement d'un moteur à combustion interne, comprenant l'acquisition d'une valeur de mesure d'une position référence de la vanne de recirculation à un instant prédéterminé correspondant à une position normalement fermée de la vanne, un calcul de la différence entre la valeur de référence acquise et une valeur de référence acquise lors d'un cycle de diagnostic préalablement effectué et une comparaison de la différence calculée avec une valeur de seuil de détection de l'ouverture de la vanne.Thus, according to the invention, there is provided a method for diagnosing the operating state of an exhaust gas recirculation valve of an internal combustion engine, comprising the acquisition of a measurement value of 'a reference position of the recirculation valve at a predetermined time corresponding to a normally closed position of the valve, calculating the difference between the acquired reference value and a reference value acquired during a previously performed diagnostic cycle and a comparison of the calculated difference with a threshold value of detection of the opening of the valve.

On vérifie ainsi, à chaque acquisition de la position fermée de la vanne, que cette dernière est effectivement fermée.It is thus verified, with each acquisition of the closed position of the valve, that the latter is effectively closed.

Selon un mode de mise en oeuvre de ce procédé, postérieurement à l'étape d'acquisition de la valeur de référence, on calcule en outre la différence entre la valeur de référence acquise au cours d'un cycle de diagnostic actuel et une valeur de référence correspondant à une même vanne de recirculation neuve et l'on compare la différence calculée avec une valeur de seuil de détection d'un dysfonctionnement de la vanne.According to an embodiment of this method, after the step of acquiring the reference value, the difference between the reference value acquired during a current diagnostic cycle and a value of reference corresponding to the same new recirculation valve and the calculated difference is compared with a threshold value of detection of a malfunction of the valve.

De préférence, la valeur de référence correspondant à une même vanne de recirculation neuve est acquise lors du premier démarrage du moteur.Preferably, the reference value corresponding to the same new recirculation valve is acquired during the first start of the engine.

De préférence, les valeurs de seuil de détection d'ouverture et de dysfonctionnement comportent chacune un premier terme variable en fonction de la température et un deuxième terme correspondant à un seuil de détection indépendant de la température.Preferably, the opening detection and malfunction threshold values each comprise a first variable term as a function of the temperature and a second term corresponding to a detection threshold independent of the temperature.

Selon une autre caractéristique de ce procédé, lesdites valeurs de seuil sont variables en fonction de paramètres de fonctionnement du moteur.According to another characteristic of this method, said threshold values are variable as a function of engine operating parameters.

L'on mémorise en outre la valeur de référence acquise au cours du cycle de diagnostic en cours en vue d'un cycle de diagnostic ultérieur s'il a été détecté une fermeture correcte de la vanne et une absence de dysfonctionnement au cours de ce cycle de diagnostic.In addition, the acquired reference value is memorized during the current diagnostic cycle for a subsequent diagnostic cycle if a correct closing of the valve has been detected and there is no malfunction during this cycle. diagnosis.

Selon l'invention, il est également proposé un dispositif de diagnostic de l'état de fonctionnement d'une vanne de recirculation de gaz d'échappement d'un moteur à combustion interne, pour la mise en oeuvre d'un procédé tel que défini ci-dessus.According to the invention, there is also provided a device for diagnosing the operating state of an exhaust gas recirculation valve of an internal combustion engine, for the implementation of a method as defined above.

Ce dispositif comprend des moyens de mesure de.la position de la vanne raccordés à une unité centrale de traitement pour délivrer à cette dernière une valeur de mesure de la position de référence de la vanne, l'unité centrale comprenant des moyens de calcul de la différence entre la valeur de référence et une valeur de référence acquise lors d'un cycle de diagnostic préalablement effectué et des moyens de comparaison de la différence calculée avec une valeur de seuil de détection de l'ouverture de la vanne.This device comprises means for measuring the position of the valve connected to a central processing unit to deliver to the latter a measurement value of the reference position of the valve, the central unit comprising means for calculating the difference between the reference value and a reference value acquired during a diagnostic cycle previously carried out and means for comparing the calculated difference with a threshold value for detecting the opening of the valve.

Selon une autre caractéristique de ce dispositif, l'unité centrale comporte des moyens de calcul de la différence entre la valeur de référence et une valeur de référence correspondant à une même vanne de recirculation neuve et des moyens de comparaison de la différence calculée avec une valeur de seuil de détection d'un dysfonctionnement de la vanne.According to another characteristic of this device, the central unit comprises means for calculating the difference between the reference value and a reference value corresponding to the same new recirculation valve and means for comparing the calculated difference with a value threshold of detection of a malfunction of the valve.

Par exemple, les moyens de mesure de la position de la vanne comportent un potentiomètre de mesure.For example, the means for measuring the position of the valve comprise a measuring potentiometer.

D'autres buts, caractéristiques et avantages de l'invention ressortiront de la description suivante, donnée uniquement à titre d'exemple non limitatif, et faite en référence aux dessins annexés, sur lesquels :

  • la figure 1 est une vue schématique d'un moteur à combustion interne équipé d'un circuit de recirculation de gaz d'échappement et pourvu d'un dispositif de diagnostic de l'état de fonctionnement de la vanne du circuit de recirculation, conforme à l'invention ; et
  • la figure 2 est un organigramme illustrant les principales phases du procédé de diagnostic selon l'invention.
Other objects, features and advantages of the invention will emerge from the following description, given solely by way of nonlimiting example, and with reference to the appended drawings, in which:
  • FIG. 1 is a schematic view of an internal combustion engine equipped with an exhaust gas recirculation circuit and provided with a device for diagnosing the operating state of the valve of the recirculation circuit, in accordance with FIG. the invention; and
  • Figure 2 is a flowchart illustrating the main phases of the diagnostic method according to the invention.

Sur la figure 1, on a représenté de manière schématique la structure générale d'un moteur à combustion interne d'un véhicule automobile, désigné par la référence numérique générale 10.FIG. 1 diagrammatically shows the general structure of an internal combustion engine of a motor vehicle, designated by the general reference numeral 10.

Dans l'exemple de réalisation considéré, le moteur 10 est pourvu de quatre cylindres 12 en ligne.In the embodiment considered, the motor 10 is provided with four cylinders 12 in line.

Les cylindres 12 sont alimentés en air par l'intermédiaire d'un répartiteur d'admission 14, lui-même alimenté par une conduite 16 pourvue d'un filtre à air (non représenté) et d'un turbocompresseur 18 de suralimentation du moteur en air.The cylinders 12 are supplied with air via an intake distributor 14, itself fed by a pipe 16 provided with an air filter (not shown) and a turbocharger 18 of the engine air supercharger.

Un collecteur d'échappement 20 récupère les gaz d'échappement issus de la combustion et évacue ces derniers vers l'extérieur, en passant par le turbocompresseur, et par une ligne d'échappement 22.An exhaust manifold 20 recovers the exhaust gases from the combustion and discharges these outwards through the turbocharger, and through an exhaust line 22.

Le circuit de recirculation des gaz d'échappement, comprenant une partie du circuit d'alimentation du moteur en air et une partie du circuit d'échappement, sert à réinjecter une partie des gaz d'échappement dans le collecteur d'admission 14, de manière à, en particulier, limiter la quantité d'oxyde d'azote produit tout en évitant la formation de fumée dans les gaz d'échappement.The exhaust gas recirculation circuit, comprising a portion of the air supply circuit of the engine and a portion of the exhaust circuit, serves to reinject a portion of the exhaust gas into the intake manifold 14, in particular, to limit the amount of nitrogen oxide produced while avoiding the formation of smoke in the exhaust gas.

Ce circuit de recirculation comporte essentiellement une vanne de recirculation des gaz d'échappement, désignée par la référence numérique générale 24.This recirculation circuit essentially comprises an exhaust gas recirculation valve, designated by the general reference numeral 24.

Par ailleurs, le moteur 10 est pourvu d'un calculateur 26 dûment programmé pour contrôler le fonctionnement du moteur 10, notamment pour procéder au réglage de ses paramètres de fonctionnement, ainsi qu'au diagnostic du fonctionnement de la vanne de recirculation 24.Moreover, the motor 10 is provided with a computer 26 duly programmed to control the operation of the engine 10, in particular for adjusting its operating parameters, as well as for the diagnosis of the operation of the recirculation valve 24.

A cet effet, l'unité centrale 26 est raccordée à un ensemble de capteurs, tels que, notamment, un capteur 28 de pression de suralimentation, un capteur 30 de température d'admission d'air dans le collecteur d'admission 14, et un capteur 32 de débit équipant la conduite 16 d'alimentation.For this purpose, the central unit 26 is connected to a set of sensors, such as, in particular, a boost pressure sensor 28, an air intake temperature sensor 30 in the intake manifold 14, and a flow sensor 32 fitted to the feed pipe 16.

En ce qui concerne le diagnostic de l'état de fonctionnement de la vanne de recirculation 24, celle-ci est pourvue d'un potentiomètre de mesure (non représenté) permettant de mesurer le déplacement angulaire de la vanne lorsqu'il s'agit d'un volet, ou le déplacement linéaire de cette vanne lorsqu'il s'agit d'une soupape, entre sa position ouverte et sa position fermée.As regards the diagnosis of the operating state of the recirculation valve 24, it is provided with a measurement potentiometer (not shown) making it possible to measure the angular displacement of the valve when it is a question of a flap, or the linear displacement of this valve when it is a valve, between its open position and its closed position.

L'unité centrale 26 comporte, stockées en mémoire, des valeurs de seuil de détection d'ouverture de la vanne, ainsi que des valeurs de seuil de détection de dysfonctionnements, et incorpore tous les moyens logiciels lui permettant de procéder, d'une part, à un pilotage de la vanne pour obtenir une quantité de gaz recirculés optimisée et, d'autre part, à un contrôle de la fermeture de la vanne ou à une détection d'un blocage à l'ouverture de cette dernière et, de manière générale, à une détection de défauts de fonctionnement, comme cela va maintenant être décrit par la suite.The central unit 26 includes, stored in memory, valve opening detection threshold values, as well as malfunction detection threshold values, and incorporates all the means software allowing it to proceed, on the one hand, to a control of the valve to obtain an optimized amount of recirculated gas and, on the other hand, to a control of the closure of the valve or to a detection of a blockage at the opening of the latter and, in general, to a detection of malfunctions, as will now be described later.

En effet, en se référant maintenant à la figure 2 sur laquelle on a représenté un cycle de diagnostic du fonctionnement de la vanne, au cours d'une première étape 34, l'unité centrale 26 procède à l'acquisition d'une valeur de mesure de la position de la vanne de recirculation, dans une zone de fonctionnement dans laquelle la vanne normalement fermée.In fact, referring now to FIG. 2, in which a diagnostic cycle of the operation of the valve has been shown, during a first step 34, the central unit 26 proceeds to acquire a value of measuring the position of the recirculation valve, in an operating zone in which the valve normally closed.

Comme indiqué précédemment, ce cycle de diagnostic est effectué à chaque démarrage du moteur ou à chaque fermeture de la vanne.As indicated above, this diagnostic cycle is carried out each time the engine is started or each time the valve is closed.

Dès lors, cette valeur de référence, qui est délivrée par le potentiomètre de mesure dont est pourvue la vanne, est acquise à un instant où l'on s'attend que la vanne soit fermée. Elle est acquise au moment du démarrage du moteur, avant d'autoriser toute commande de la vanne à l'ouverture, et après chaque ordre de fermeture de la vanne, de manière à compenser les dilatations du corps de vanne et du potentiomètre engendrée sous l'effet de la température des gaz d'échappement.Therefore, this reference value, which is delivered by the measuring potentiometer which is provided with the valve, is acquired at a time when it is expected that the valve is closed. It is acquired at the start of the engine, before allowing any control of the valve on opening, and after each closing order of the valve, so as to compensate for the expansion of the valve body and the potentiometer generated under the effect of the temperature of the exhaust gas.

Lors de l'étape 38 suivante, on procède à une détection de blocage de la vanne en position ouverte ou, en d'autres termes, on contrôle que la position de référence correspond à une position fermée de la vanne.In the next step 38, the blocking detection of the valve is made in the open position, or in other words, it is checked that the reference position corresponds to a closed position of the valve.

Pour ce faire, l'unité centrale 26 procède à un calcul de la différence entre la valeur de référence acquise au cours du cycle de diagnostic actuel et une valeur de référence acquise au cours d'un cycle de diagnostic préalablement effectué et correspondant à une absence de dysfonctionnement.To do this, the central unit 26 proceeds with a calculation of the difference between the reference value acquired during the current diagnostic cycle and a reference value acquired during a diagnostic cycle previously performed and corresponding to an absence. malfunction.

Au cours de cette étape, la différence ainsi calculée est comparée avec une valeur de détection d'ouverture de vanne.During this step, the difference thus calculated is compared with a valve opening detection value.

Ainsi, si la valeur de la différence calculée est supérieure à cette valeur de seuil, on décide, lors de l'étape 40 suivante, que la vanne est bloquée et un signal d'erreur est émis.Thus, if the value of the calculated difference is greater than this threshold value, it is decided, in the next step 40, that the valve is blocked and an error signal is emitted.

On notera que, de préférence, la valeur de seuil utilisée pour la détection du blocage de l'ouverture de la vanne de recirculation 24 comporte un premier terme variable en fonction de la température des gaz d'échappement, ainsi qu'un deuxième terme indépendant de la température.It will be noted that, preferably, the threshold value used for the detection of the blockage of the opening of the recirculation valve 24 comprises a first variable term as a function of the temperature of the exhaust gases, as well as a second independent term of the temperature.

Si, à l'issue de cette étape 38 de diagnostic, il est considéré que la vanne est effectivement fermée, lors de l'étape 42 suivante, on procède à un deuxième diagnostic de manière à déterminer l'encrassement de la vanne ou, de manière générale, à détecter tout défaut de fonctionnement de la vanne.If, at the end of this diagnostic step 38, it is considered that the valve is effectively closed, in the following step 42, a second diagnosis is performed in order to determine the fouling of the valve or, in general, to detect any malfunction of the valve.

Pour ce faire, le calculateur 26 procède à un calcul de la différence entre la valeur de référence acquise au cours de ce cycle de diagnostic et d'une valeur de référence de mesure correspondant à une même vanne neuve ou décrassée. De préférence, cette valeur de référence de mesure est acquise lors du premier démarrage du moteur.To do this, the computer 26 calculates the difference between the reference value acquired during this diagnostic cycle and a measurement reference value corresponding to the same new or unclassed valve. Preferably, this measurement reference value is acquired during the first start of the engine.

Il procède alors à une comparaison de cette différence calculée avec une deuxième valeur de seuil de détection d'un encrassement de la vanne.It then proceeds to a comparison of this calculated difference with a second threshold value of detection of a clogging of the valve.

Dès lors, si la différence calculée est supérieure à cette valeur de seuil, lors de l'étape 44 suivante, un signal d'erreur est émis de manière à indiquer que la vanne de recirculation est encrassée.Therefore, if the calculated difference is greater than this threshold value, in the next step 44, an error signal is emitted to indicate that the recirculation valve is fouled.

On notera que le seuil utilisé pour procéder à ce deuxième diagnostic est également, de préférence, constitué d'un premier terme variable en fonction de la température, et d'un deuxième terme correspondant à un seuil de détection indépendant de la température.It will be noted that the threshold used to carry out this second diagnosis is also preferably composed of a first variable term as a function of the temperature, and a second term corresponding to a detection threshold independent of the temperature.

On notera également que les seuils indiqués précédemment pour procéder au diagnostic de l'état de fonctionnement de la vanne sont, de préférence, constitués par des valeurs de seuil variables en fonction des paramètres de fonctionnement du moteur, en particulier en ce qui concerne le deuxième terme.It will also be noted that the thresholds indicated above for performing the diagnosis of the operating state of the valve are preferably constituted by variable threshold values as a function of the operating parameters of the engine, in particular with regard to the second term.

En ce qui concerne le premier terme, celui-ci peut être élaboré à partir d'une mesure de température des gaz d'échappement recirculés, puis d'un traitement réalisé au sein de l'unité centrale 26.With regard to the first term, this can be developed from a temperature measurement of the recirculated exhaust gas, and then from a treatment carried out within the central unit 26.

En variante, en alternative à l'utilisation de ce premier terme variable en fonction de la température, il est également possible de procéder à un traitement de la valeur de référence acquise en fonction de la température des gaz d'échappement.Alternatively, as an alternative to the use of this first variable term depending on the temperature, it is also possible to process the acquired reference value as a function of the temperature of the exhaust gas.

A l'issue de cette deuxième étape de diagnostic 42, s'il est détecté que la vanne de recirculation est effectivement fermée et que son fonctionnement est correct, la valeur de référence du cycle en cours est stockée en mémoire dans l'unité centrale en vue d'être utilisée lors d'un cycle de diagnostic ultérieur.At the end of this second diagnostic step 42, if it is detected that the recirculation valve is effectively closed and that its operation is correct, the reference value of the current cycle is stored in memory in the central unit. to be used in a subsequent diagnostic cycle.

Lors de l'étape 46 suivante, on procède à une commande de la vanne en fonction d'une valeur de consigne délivrée par l'unité centrale 26.In the following step 46, the valve is controlled according to a set value delivered by the central unit 26.

Comme indiqué précédemment, à chaque fermeture de vanne, on procède à l'acquisition d'une nouvelle valeur de référence de mesure.As previously indicated, at each valve closure, a new measurement reference value is acquired.

Ainsi, après chaque ordre de fermeture de vanne émis par le calculateur, la procédure retourne à l'étape 34 précédemment mentionnée, après expiration d'une période de temps prédéterminée, correspondant au temps de fermeture de la vanne (étape 48).Thus, after each valve closure command issued by the computer, the procedure returns to the previously mentioned step 34, after expiration of a predetermined period of time, corresponding to the closing time of the valve (step 48).

Claims (9)

  1. Diagnostic method for checking the operating condition of an exhaust gas recirculation valve of an internal combustion engine, characterized in that it comprises the acquisition of a measurement value of a reference position of the recirculation valve at a preset moment corresponding to a normally-closed position of the valve, a calculation of the difference between the reference value obtained and a reference value obtained during a diagnostic cycle previously carried out and a comparison of the difference calculated with a threshold value for detection of the opening of the valve.
  2. Method according to Claim 1, characterized in that subsequently to the reference value acquisition step, the difference between the reference value obtained in the course of a current diagnostic cycle and a reference value corresponding to a new recirculation valve of the same type is calculated and this is compared with the difference calculated is compared with a threshold value for detection of a malfunction of the valve.
  3. Method according to Claim 2, characterized in that the said reference value corresponding to a new recirculation valve of the same type is obtained the first time the engine is started.
  4. Method according to any one of Claims 1 to 3, characterized in that the threshold values for detection of opening and malfunction each include a first term which varies according to the temperature and a second term corresponding to a detection threshold independent of the temperature.
  5. Method according to any one of Claims 1 to 4, characterized in that the said threshold values vary according to operating parameters of the engine.
  6. Method according to any one of Claims 1 to 5, characterized in that the reference value obtained in the course of the current diagnostic cycle is stored for a later diagnostic cycle if a correct closure of the valve and an absence of malfunction has been detected in the course of this diagnostic cycle.
  7. Diagnostic system for checking the operating condition of an exhaust gas recirculation valve of an internal combustion engine, for the use of a method according to any one of Claims 1 to 6, characterized in that it comprises means for measuring the position of the valve, which means are connected to a central processing unit (26) to send to the latter a measurement value of the reference position of the valve, the central unit (26) comprising means for calculating the difference between the reference value and a reference value obtained during a diagnostic cycle previously carried out and means for comparing the difference calculated with a threshold value for detection of the opening of the valve.
  8. System according to Claim 7, characterized in that the central processing unit (26) includes means for calculating the difference between the reference value and a reference value corresponding to a new recirculation valve and means for comparing the difference calculated with a threshold value for detection of a malfunction of the valve.
  9. System according to either of Claims 7 and 8, characterized in that the means for measuring the position of the valve include a measuring potentiometer.
EP03732622A 2002-02-25 2003-02-25 Method and device for diagnosing the operating condition of an internal combustion engine exhaust gas recycling valve Expired - Fee Related EP1478838B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0202362 2002-02-25
FR0202362A FR2836517B1 (en) 2002-02-25 2002-02-25 METHOD AND DEVICE FOR DIAGNOSING THE OPERATING STATE OF AN EXHAUST GAS RECIRCULATION VALVE OF AN INTERNAL COMBUSTION ENGINE
PCT/FR2003/000601 WO2003071121A1 (en) 2002-02-25 2003-02-25 Method and device for diagnosing the operating condition of an internal combustion engine exhaust gas recycling valve

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EP1478838A1 EP1478838A1 (en) 2004-11-24
EP1478838B1 true EP1478838B1 (en) 2007-10-03

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EP03732622A Expired - Fee Related EP1478838B1 (en) 2002-02-25 2003-02-25 Method and device for diagnosing the operating condition of an internal combustion engine exhaust gas recycling valve

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EP (1) EP1478838B1 (en)
JP (1) JP4277687B2 (en)
DE (1) DE60316667T2 (en)
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WO (1) WO2003071121A1 (en)

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FR2900446B1 (en) * 2006-04-28 2008-06-20 Renault Sas EXHAUST GAS RECYCLING SYSTEM OF AN ENGINE OF A VEHICLE ADAPTED TO EVACUATE AN ELEMENT PRESENT IN A CONTROL VALVE OF AN EXHAUST GAS RECIRCULATION CIRCUIT
FR2910626B1 (en) * 2006-12-20 2009-02-27 Renault Sas METHOD FOR DIAGNOSING THE OPERATION OF AN ACTUATOR
DE102008034223A1 (en) * 2008-07-23 2010-01-28 Bayerische Motoren Werke Aktiengesellschaft Reducing agent tank for providing reducing agent to an exhaust system with shut-off valve
FR2941781B1 (en) * 2009-02-05 2011-03-04 Peugeot Citroen Automobiles Sa METHOD FOR DIAGNOSING THE STATE OF A SOLENOID VALVE
US8775011B2 (en) 2011-04-18 2014-07-08 Ford Global Technologies, Llc Distinguishing between EGR valve and oxygen sensor degradation

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JPS62279261A (en) * 1986-05-28 1987-12-04 Mitsubishi Electric Corp Egr valve control device
JP2661396B2 (en) * 1991-04-15 1997-10-08 三菱電機株式会社 Failure diagnosis device for EGR control device
JP3097491B2 (en) * 1995-04-12 2000-10-10 トヨタ自動車株式会社 Failure diagnosis device for exhaust gas recirculation device
US5771869A (en) * 1996-06-12 1998-06-30 Toyota Jidosha Kabushiki Kaisha Malfunction determining apparatus of an exhaust gas recirculation system
JP2845198B2 (en) * 1996-06-12 1999-01-13 トヨタ自動車株式会社 Abnormality determination device for exhaust gas recirculation device
FR2753488B1 (en) 1996-09-17 1998-10-30 Renault AIR SUPPLY SYSTEM FOR AN INTERNAL COMBUSTION ENGINE
JPH10122058A (en) * 1996-10-16 1998-05-12 Toyota Motor Corp Exhaust gas recirculating device for internal combustion engine
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DE60316667D1 (en) 2007-11-15
FR2836517B1 (en) 2004-05-28
JP2005522613A (en) 2005-07-28
JP4277687B2 (en) 2009-06-10
WO2003071121A1 (en) 2003-08-28
US20050145231A1 (en) 2005-07-07
US7100585B2 (en) 2006-09-05
FR2836517A1 (en) 2003-08-29
ES2290469T3 (en) 2008-02-16
EP1478838A1 (en) 2004-11-24

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