EP1478838A1 - 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 valveInfo
- Publication number
- EP1478838A1 EP1478838A1 EP03732622A EP03732622A EP1478838A1 EP 1478838 A1 EP1478838 A1 EP 1478838A1 EP 03732622 A EP03732622 A EP 03732622A EP 03732622 A EP03732622 A EP 03732622A EP 1478838 A1 EP1478838 A1 EP 1478838A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- reference value
- difference
- exhaust gas
- value
- 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
Links
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, as well as to a corresponding diagnostic device.
- Motor vehicles and in particular diesel type motor vehicles, are often equipped with an exhaust gas recirculation circuit intended to reinject the exhaust gases into the engine's intake manifold.
- inert gases are injected into the engine cylinders, which make it possible to reduce the amount of nitrogen oxide produced by the engine.
- This recirculation is however likely to significantly increase the amount of smoke in the exhaust gas if it is not properly adjusted and, in particular, if the amount of exhaust gas recirculated is too large.
- the exhaust gas recirculation circuit is provided with a valve for adjusting the flow of recirculated gases.
- An electronic computer responsible for managing the quantity of fuel to be injected into the engine cylinders, controls the regulating valve to regulate the percentage of recirculated gases.
- diagnosis or the control of the correct functioning of the exhaust gas recirculation valve is carried out by comparing fresh air flow setpoints supplied by the electronic computer with measurements supplied by a corresponding flowmeter or, as a variant , by comparing the valve position setpoint. recirculation provided by the 'computer to a position measured by a measuring potentiometer.
- a malfunction occurs when the difference between a measured value and a corresponding setpoint value is greater than a predetermined threshold value.
- this technique is likely to cause non-detection of dysfunction. Indeed, when a frank acceleration is requested by the driver, the computer requires a cut of the regulation of the quantity of recirculated gases, and no regulation is then carried out, as regards the recirculation of exhaust gases. 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 learning the position closed of the valve due to the manufacturing tolerances of the valves and of the measurement potentiometers, the manufacturing tolerances of the valve being relatively large compared to that of the potentiometer.
- this learning is made necessary by the temperature sensitivity of the potentiometer and of the valve body, which causes urte .variation of the valve position measurements as a function of the temperature.
- Such learning is generally carried out each time the engine is started, before authorizing an opening of the valve and making any regulation, then each closing of the valve, in order to take into account the evolution of the position corresponding to the valve.
- 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 d 'a " reference position of the recirculation valve at a predetermined instant corresponding to a normally closed position of the valve, a calculation of the difference between the acquired reference value and a reference value acquired during a diagnostic cycle previously carried out and a comparison of the calculated difference with a threshold value for detecting 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 difference calculated is compared with a threshold value for detecting a valve malfunction.
- the reference value corresponding to the same new recirculation valve is acquired when the engine is started for the first time.
- the opening and malfunction detection 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 operating parameters of the engine.
- a device for diagnosing the operating state of an exhaust gas recirculation valve of an internal combustion engine, for implementing a method as defined above.
- This device includes 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 value reference 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 includes 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 difference calculated with a value threshold for detecting a valve malfunction.
- the means for measuring the position of the valve include a measurement potentiometer.
- 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 to the invention
- FIG. 2 is a flow diagram illustrating the main phases of the diagnostic method according to the invention.
- FIG. 1 there is shown schematically the general structure of an internal combustion engine of a motor vehicle, designated by the general reference numeral 10.
- the engine 10 is provided with four cylinders 12 in line.
- the cylinders 12 are supplied with air via an intake distributor 14, itself supplied by a pipe 16 provided with an air filter (not shown) and a turbocharger 18 for supercharging the engine with air.
- An exhaust manifold 20 collects the exhaust gases from the combustion and evacuates them to the outside, via the turbocharger, and through an exhaust line 22. '
- the exhaust gas recirculation circuit comprising a part of the engine air supply circuit and a part of the exhaust circuit, serves to reinject part of the exhaust gases into the intake manifold 14, so as, in particular, to limit the quantity of nitrogen oxide produced while avoiding the formation of smoke in the exhaust gases.
- This recirculation circuit essentially comprises a valve, for recirculating the exhaust gases, designated by the general reference numeral 24.
- the engine 10 is provided with a computer 26 duly programmed to control the operation of the engine 10, in particular to adjust its operating parameters, as well as to diagnose 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, a sensor 30 for the temperature of admission of air into the intake manifold 14, and a flow sensor 32 fitted to the supply line 16.
- sensors such as, in particular, a boost pressure sensor 28, a sensor 30 for the temperature of admission of air into the intake manifold 14, and a flow sensor 32 fitted to the supply line 16.
- a measurement potentiometer (not shown) for measuring the angular displacement of the valve when it is acting 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 comprises, stored in memory, threshold values for detecting the opening of the valve, as well as threshold values for detecting malfunctions, and incorporates all the means software allowing him to carry out, on the one hand, a control of the valve to obtain an optimized quantity of recirculated gases and, on the other hand, a control of the closing of the valve or a detection of a blockage at the opening of the latter and, in general, a detection of faults. operation, as will now be described later.
- the central unit 26 proceeds to acquire a value of measurement of the position of the recirculation valve, in an operating zone in which the valve normally closed.
- this diagnostic cycle is performed each time the engine is started or the valve is closed.
- this reference value which is delivered by the measurement potentiometer with which the valve is provided, is acquired at a time when it is expected that the valve is closed. It is acquired when the engine starts, before authorizing any command to open the valve, and after each valve close command, so as to compensate for the expansion of the valve body and the potentiometer generated under the valve. effect of exhaust gas temperature.
- a blocking detection of the valve in the open position is carried out or, in other words, it is checked that the reference position corresponds to a closed position of the valve.
- the central unit 26 calculates the difference between the reference value acquired during the current diagnostic cycle and a reference value acquired during a diagnostic cycle previously carried out and corresponding to an absence malfunction.
- the difference thus calculated is compared with a valve opening detection value.
- this threshold value it is decided, during the following step 40, that the valve is blocked and an error signal is emitted.
- the threshold value used for the detection of the blocking of the opening of the recirculation valve 24 comprises a first term variable as a function of the temperature of the exhaust gases, as well as a second independent term of the temperature.
- a second diagnosis is carried out so as 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 defective valve.
- this measurement reference value is acquired when the engine is started for the first time.
- the threshold used to carry out this second diagnosis is also preferably made up of a first term variable as a function of temperature, and of a second term corresponding to a detection threshold independent of temperature.
- the thresholds indicated above for diagnosing 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.
- the first term it can be developed from a measurement of the temperature of the recirculated exhaust gases, then from a treatment carried out within the central unit 26.
- this first variable term as a function of the temperature, it is also possible to carry out a processing of the acquired reference value as a function of the temperature of the exhaust gases.
- this second diagnostic step 42 if it is detected that the recirculation valve is actually closed and that its operation is correct, the reference value of the cycle in progress is stored in memory in the central unit in to be used in a subsequent diagnostic cycle.
- valve is controlled as a function of a set value delivered by the central unit 26.
- the procedure returns to step 34 previously mentioned, after expiration of a predetermined time period, corresponding to the valve closing time (step 48).
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
FR0202362 | 2002-02-25 | ||
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1478838A1 true EP1478838A1 (en) | 2004-11-24 |
EP1478838B1 EP1478838B1 (en) | 2007-10-03 |
Family
ID=27676048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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 |
Country Status (7)
Country | Link |
---|---|
US (1) | US7100585B2 (en) |
EP (1) | EP1478838B1 (en) |
JP (1) | JP4277687B2 (en) |
DE (1) | DE60316667T2 (en) |
ES (1) | ES2290469T3 (en) |
FR (1) | FR2836517B1 (en) |
WO (1) | WO2003071121A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
FR2764641B1 (en) * | 1997-06-13 | 1999-09-03 | Renault | METHOD AND DEVICE FOR CORRECTING THE WEALTH OF AN INTERNAL COMBUSTION ENGINE |
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 |
-
2002
- 2002-02-25 FR FR0202362A patent/FR2836517B1/en not_active Expired - Lifetime
-
2003
- 2003-02-25 US US10/504,142 patent/US7100585B2/en not_active Expired - Fee Related
- 2003-02-25 EP EP03732622A patent/EP1478838B1/en not_active Expired - Fee Related
- 2003-02-25 ES ES03732622T patent/ES2290469T3/en not_active Expired - Lifetime
- 2003-02-25 JP JP2003569995A patent/JP4277687B2/en not_active Expired - Fee Related
- 2003-02-25 WO PCT/FR2003/000601 patent/WO2003071121A1/en active IP Right Grant
- 2003-02-25 DE DE60316667T patent/DE60316667T2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03071121A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2836517B1 (en) | 2004-05-28 |
FR2836517A1 (en) | 2003-08-29 |
ES2290469T3 (en) | 2008-02-16 |
DE60316667T2 (en) | 2008-07-17 |
US20050145231A1 (en) | 2005-07-07 |
US7100585B2 (en) | 2006-09-05 |
EP1478838B1 (en) | 2007-10-03 |
JP2005522613A (en) | 2005-07-28 |
DE60316667D1 (en) | 2007-11-15 |
WO2003071121A1 (en) | 2003-08-28 |
JP4277687B2 (en) | 2009-06-10 |
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