EP1478838B1 - Verfahren und vorrichtung zur diagnose des betriebszustands eines verbrennungsmotor-abgasrückführventils - Google Patents

Verfahren und vorrichtung zur diagnose des betriebszustands eines verbrennungsmotor-abgasrückführventils 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
Authority
EP
European Patent Office
Prior art keywords
valve
reference value
difference
detection
exhaust gas
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.)
Expired - Lifetime
Application number
EP03732622A
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English (en)
French (fr)
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EP1478838A1 (de
Inventor
Stéphane Bourret
Laurent Leprieur
Olivier Meurisse
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Renault SAS
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Renault SAS
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Filing date
Publication date
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Classifications

    • 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).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Claims (9)

  1. Verfahren zur Diagnose des Betriebszustands eines Abgasrückführungsventils eines Verbrennungsmotors, dadurch gekennzeichnet, dass es die Erfassung eines Messwerts einer Bezugsposition des Rückführungsventils in einem vorbestimmten Zeitpunkt entsprechend einer normalerweise geschlossenen Position des Ventils, eine Berechnung der Differenz zwischen dem erfassten Bezugswert und einem Bezugswert, der während eines vorher durchgeführten Diagnosezyklus erfasst wurde, und einen Vergleich der berechneten Differenz mit einem Erkennungsschwellwert der Öffnung des Ventils aufweist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass nach dem Schritt der Erfassung des Bezugswerts die Differenz zwischen dem während eines aktuellen Diagnosezyklus erfassten Bezugswert und einem Bezugswert berechnet wird, der einem gleichen neuen Rückführungsventil entspricht, und der berechnete Wert mit einem Erkennungsschwellwert einer Fehlfunktion des Ventils verglichen wird.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der einem gleichen neuen Rückführungsventils entsprechende Bezugswert während des ersten Starts des Motors erfasst wird.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Erkennungsschwellwerte einer Öffnung und einer Fehlfunktion je einen ersten Term, der in Abhängigkeit von der Temperatur variabel ist, und einen zweiten Term aufweisen, der einem von der Temperatur unabhängigen Erkennungsschwellwert entspricht.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Schwellwerte in Abhängigkeit von Betriebsparametern des Motors variabel sind.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der während des laufenden Diagnosezyklus erfasste Bezugswert für einen späteren Diagnosezyklus gespeichert wird, wenn ein korrektes Schließen des Ventils und ein Nichtvorhandensein einer Fehlfunktion während dieses Diagnosezyklus erkannt wurde.
  7. Vorrichtung zur Diagnose des Betriebszustands eines Abgasrückführungsventils eines Verbrennungsmotors für die Anwendung eines Verfahrens nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass sie Mittel zur Messung der Position des Ventils aufweist, die mit einer zentralen Verarbeitungseinheit (26) verbunden sind, um an diese letztere einen Messwert der Bezugsposition des Ventils zu liefern, wobei die Zentraleinheit (26) Mittel zur Berechnung der Differenz zwischen dem Bezugswert und einem Bezugswert, der während eines vorher durchgeführten Diagnosezyklus erfasst wurde, und Mittel zum Vergleich der berechneten Differenz mit einem Erkennungsschwellwert des Öffnens des Ventils aufweist.
  8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Zentraleinheit (26) Mittel zur Berechnung der Differenz zwischen dem Bezugswert und einem Bezugswert, der einem neuen Rückführungsventil entspricht, und Mittel zum Vergleich der berechneten Differenz mit einem Erkennungsschwellwert einer Fehlfunktion des Ventils aufweist.
  9. Vorrichtung nach einem der Ansprüche 7 und 8, dadurch gekennzeichnet, dass die Mittel zur Messung der Position des Ventils ein Messpotentiometer aufweisen.
EP03732622A 2002-02-25 2003-02-25 Verfahren und vorrichtung zur diagnose des betriebszustands eines verbrennungsmotor-abgasrückführventils Expired - Lifetime EP1478838B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0202362 2002-02-25
FR0202362A FR2836517B1 (fr) 2002-02-25 2002-02-25 Procede et dispositif de diagnostic de l'etat de fonctionnement d'une vanne de recirculation de gaz d'echappement d'un moteur a combustion interne
PCT/FR2003/000601 WO2003071121A1 (fr) 2002-02-25 2003-02-25 Procédé et dispositif de diagnostic de l'état de fonctionnement d'une vanne de recirculation de gaz d'échappement d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1478838A1 EP1478838A1 (de) 2004-11-24
EP1478838B1 true EP1478838B1 (de) 2007-10-03

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EP03732622A Expired - Lifetime EP1478838B1 (de) 2002-02-25 2003-02-25 Verfahren und vorrichtung zur diagnose des betriebszustands eines verbrennungsmotor-abgasrückführventils

Country Status (7)

Country Link
US (1) US7100585B2 (de)
EP (1) EP1478838B1 (de)
JP (1) JP4277687B2 (de)
DE (1) DE60316667T2 (de)
ES (1) ES2290469T3 (de)
FR (1) FR2836517B1 (de)
WO (1) WO2003071121A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2900446B1 (fr) * 2006-04-28 2008-06-20 Renault Sas Systeme de recyclage de gaz d'echappement d'un moteur d'un vehicule adapte a evacuer un element present dans une vanne de controle d'un circuit de recirculation de gaz d'echappement
FR2910626B1 (fr) * 2006-12-20 2009-02-27 Renault Sas Methode de diagnostic du fonctionnement d'un actionneur
DE102008034223A1 (de) * 2008-07-23 2010-01-28 Bayerische Motoren Werke Aktiengesellschaft Reduktionsmitteltank zum Bereitstellen von Reduktionsmittel an einer Abgasanlage mit Absperrventil
FR2941781B1 (fr) * 2009-02-05 2011-03-04 Peugeot Citroen Automobiles Sa Procede de diagnostic de l'etat d'une electrovanne
US8775011B2 (en) 2011-04-18 2014-07-08 Ford Global Technologies, Llc Distinguishing between EGR valve and oxygen sensor degradation

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Publication number Priority date Publication date Assignee Title
JPS62279261A (ja) * 1986-05-28 1987-12-04 Mitsubishi Electric Corp Ｅｇｒバルブ制御装置
JP2661396B2 (ja) * 1991-04-15 1997-10-08 三菱電機株式会社 Ｅｇｒ制御装置の故障診断装置
JP3097491B2 (ja) * 1995-04-12 2000-10-10 トヨタ自動車株式会社 排気ガス還流装置の故障診断装置
JP2845198B2 (ja) * 1996-06-12 1999-01-13 トヨタ自動車株式会社 排気ガス再循環装置の異常判定装置
US5771869A (en) * 1996-06-12 1998-06-30 Toyota Jidosha Kabushiki Kaisha Malfunction determining apparatus of an exhaust gas recirculation system
FR2753488B1 (fr) 1996-09-17 1998-10-30 Renault Systeme d'alimentation en air d'un moteur a combustion interne
JPH10122058A (ja) * 1996-10-16 1998-05-12 Toyota Motor Corp 内燃機関の排ガス再循環装置
FR2764641B1 (fr) * 1997-06-13 1999-09-03 Renault Procede et dispositif de correction de la richesse d'un moteur a combustion interne
US5970961A (en) * 1998-02-04 1999-10-26 Ford Global Technologies, Inc. Valve control method
US6253748B1 (en) * 1998-05-09 2001-07-03 Robert Bosch Gmbh Method and device for controlling an internal combustion engine
US6837226B2 (en) * 2001-01-31 2005-01-04 Cummins, Inc. System for diagnosing EGR valve, actuator and sensor related failure conditions

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Publication number Publication date
FR2836517B1 (fr) 2004-05-28
US7100585B2 (en) 2006-09-05
FR2836517A1 (fr) 2003-08-29
EP1478838A1 (de) 2004-11-24
WO2003071121A1 (fr) 2003-08-28
JP4277687B2 (ja) 2009-06-10
DE60316667D1 (de) 2007-11-15
US20050145231A1 (en) 2005-07-07
JP2005522613A (ja) 2005-07-28
DE60316667T2 (de) 2008-07-17
ES2290469T3 (es) 2008-02-16

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