WO2002052143A1 - Dispositif de diagnostic de defaillance destine a un dispositif de recyclage de gaz d'echappement - Google Patents
Dispositif de diagnostic de defaillance destine a un dispositif de recyclage de gaz d'echappement Download PDFInfo
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- WO2002052143A1 WO2002052143A1 PCT/JP2001/011234 JP0111234W WO02052143A1 WO 2002052143 A1 WO2002052143 A1 WO 2002052143A1 JP 0111234 W JP0111234 W JP 0111234W WO 02052143 A1 WO02052143 A1 WO 02052143A1
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- exhaust gas
- abnormality diagnosis
- gas recirculation
- control valve
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Classifications
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
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- 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
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0017—Controlling intake air by simultaneous control of throttle and exhaust gas recirculation
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0022—Controlling intake air for diesel engines by throttle control
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
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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
- 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
- F02D2200/0404—Throttle position
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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
- 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
- F02D2200/0406—Intake manifold pressure
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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
- 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
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
- F02D2200/501—Vehicle speed
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/602—Pedal position
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
- F02D41/187—Circuit arrangements for generating control signals by measuring intake air flow using a hot wire flow sensor
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3827—Common rail control systems for diesel engines
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/406—Electrically controlling a diesel injection pump
- F02D41/408—Electrically controlling a diesel injection pump of the distributing type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to an abnormality diagnosis device for an exhaust gas recirculation device that recirculates exhaust gas of an internal combustion engine to an intake system of the engine.
- an internal combustion engine such as a vehicle engine provided with an exhaust gas recirculation (EGR) device that recirculates a part of exhaust gas to an intake system in order to improve exhaust emission.
- This EGR device includes an EGR passage that connects an exhaust passage and an intake passage of an internal combustion engine, and an EGR valve provided in the EGR passage. By adjusting the opening of the EGR valve, the amount of exhaust gas (EGR amount) recirculated from the exhaust passage to the intake passage is adjusted.
- EGR amount exhaust gas recirculation
- the exhaust gas lowers the combustion temperature of the fuel and suppresses the generation of nitrogen oxides (NOx) in the combustion chamber.
- Missions will be improved.
- Japanese Patent Application Laid-Open No. H4-140464 discloses that when a predetermined abnormality diagnosis condition is satisfied, the EGR valve is forcibly set to a fully closed state or a fully open state, and this EGR pulp operation is performed.
- a failure diagnosis device for an exhaust gas recirculation system has been proposed in which the amount of change in pressure in the intake passage is measured and the presence or absence of an abnormality in the EGR device is determined based on the amount of change in pressure.
- the failure diagnosis device disclosed in the above publication measures the amount of change in pressure in the intake passage. For this reason, the EGR valve is set to the fully closed state or the fully open state, and the amount of change in the EGR amount during that time increases. If the amount of change in the EGR amount becomes large in this way, there is a possibility that the exhaust emission will deteriorate, or that the combustion state will change greatly, causing a sudden change in the engine output and drivability will deteriorate.
- a device that determines the presence or absence of an abnormality in the EGR device based on the measurement result of the engine control amount such as intake pressure measures sensors to measure the engine control amount used for abnormality determination, for example, intake pressure If the intake air pressure sensor or the air flow meter that measures the amount of intake air is out of order, it is naturally impossible to accurately determine whether an abnormality has occurred in the EGR system.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an exhaust gas recirculation device abnormality diagnosis device that can easily and reliably perform an exhaust gas recirculation device abnormality diagnosis.
- An abnormality diagnosis device for an exhaust gas recirculation device includes: a control valve provided in the exhaust gas recirculation passage, which communicates an exhaust system of an internal combustion engine with a downstream of a throttle valve of an intake system by an exhaust gas recirculation passage.
- the present invention is applied to an exhaust gas recirculation device in which the amount of exhaust gas recirculated from the exhaust system to the intake system is adjusted by controlling the opening degree of the exhaust gas.
- the abnormality diagnostic device drives and controls the control valve so that the opening of the control valve gradually changes when a predetermined abnormality diagnosis condition is satisfied, and a predetermined period after the start of the drive control of the control valve.
- the amount of change in the intake air amount or the amount of change in the intake pressure is detected. If the detected value does not exceed a predetermined determination value, it is diagnosed that there is an abnormality in the exhaust gas recirculation device.
- the opening of the control valve of the exhaust gas recirculation passage is controlled so as to gradually change. Therefore, if there is no abnormality in the exhaust gas recirculation device, the exhaust gas recirculation amount does not change or does not rapidly increase or decrease, and the exhaust gas recirculation amount gradually changes. Although there is a response delay in the gas with respect to the change in the opening of the control valve, the change amount of the exhaust gas recirculation amount becomes equal to or more than a predetermined amount after a predetermined period.
- Such a change in the exhaust gas recirculation amount causes a change in the intake air amount or the intake pressure, and the change in the exhaust gas recirculation amount is detected by detecting the change amount of the intake air amount or the change in the intake pressure during a predetermined period.
- the quantity can be determined. Therefore, when the amount of change in the amount of intake air or the amount of change in the intake pressure during the predetermined period during the control of the control valve is equal to or smaller than the determination value, it can be diagnosed that there is an abnormality in the exhaust gas recirculation device. Can be easily and reliably diagnosed.
- the exhaust gas recirculation amount does not rapidly increase or decrease when the exhaust gas recirculation device is diagnosed, so that it is possible to suppress the deterioration of the exhaust emission and suppress the change in the combustion state to suppress the rapid fluctuation of the engine output. Therefore, it is possible to suppress the deterioration of driver parity.
- the abnormality diagnosis device performs abnormality diagnosis of the exhaust gas recirculation device when the operation state of the internal combustion engine is stable. When the operating state of the internal combustion engine is stable, the intake air amount or intake pressure is stable.
- abnormality diagnosis of the exhaust gas recirculation system is performed when the operating condition of the internal combustion engine is stable, it is possible to suppress changes in intake air volume or changes in intake pressure based on factors other than control of the opening of the control valve.
- the accuracy of abnormality diagnosis can be improved.
- the abnormality diagnosis device performs abnormality diagnosis of the exhaust gas recirculation device when the operation state of the internal combustion engine is decelerating the vehicle and the fuel supply amount is equal to or less than a predetermined amount. At this time, since almost no fuel combustion occurs, the exhaust The deterioration of the session can be reliably suppressed. It is preferable that the abnormality diagnosis device suppresses a change in the opening degree of the throttle valve when performing abnormality diagnosis.
- the abnormality diagnosis device fixes the opening of the throttle valve when performing abnormality diagnosis.
- the opening of the throttle valve is fixed, and fluctuations in pressure and air amount in the intake system are accurately suppressed. Accuracy can be further improved.
- the number of abnormal diagnoses should be as small as possible.
- the trip is a period from when the internal combustion engine is started to when it is stopped.
- a preferable abnormality diagnosis device is configured to perform the abnormality diagnosis when the abnormality diagnosis condition is satisfied.
- the driving direction of the control valve is set based on the opening degree of the control valve. In this case, the driving direction of the control valve is set to the opening side or the closing side based on the opening degree of the control valve when the abnormal diagnosis condition is satisfied. Therefore, the total drive amount of the control valve from the opening position of the control valve when the abnormality diagnosis condition is satisfied can be secured. By ensuring the total drive amount of the control valve in this way, the amount of change in the exhaust gas recirculation amount can be made equal to or more than a predetermined amount.
- the abnormality diagnosis device sets the drive direction of the control valve to the closing side when the opening of the control valve is equal to or greater than a first predetermined opening when the abnormality diagnosis condition is satisfied, When the opening of the control valve is less than the first predetermined opening, the driving direction of the control valve is preferably set to the opening side.
- the driving direction of the control valve is set to the closing side, and the opening of the control valve is set to the first predetermined opening. If it is less than, the drive direction of the control valve is set to the open side. Therefore, the total drive amount from the opening of the control valve when the abnormality diagnosis condition is satisfied can be secured. It is preferable that the abnormality diagnosis device sets the gradual change amount for driving the control valve to the closed side and the gradual change amount for driving the control valve to the open side to different values.
- the gradual change amount for driving the control valve to the close side and the gradual change amount for driving to the open side are set to different values
- the gradual change amount for driving the control valve to the close side and the control valve to the open side are set. It can be set to a value larger than the gradually changing amount to be driven.
- the magnitude of the exhaust gas recirculation affects the engine output
- the abnormality diagnosis device changes the gradual change amount when the opening of the control valve reaches a second predetermined opening with the drive control of the control valve.
- the gradual change amount of the opening degree of the control valve is changed so as to increase on the opening side of the control valve and to decrease on the closing side of the control valve. Can be changed. If the opening degree of the control valve is greater than or equal to the second predetermined opening degree, if the control valve is less sensitive to the change in the exhaust gas recirculation amount with respect to the opening degree change, the amount of gradual change in the opening degree of the control valve is constant.
- the amount of change in the exhaust gas recirculation amount is small when the opening degree of the control valve is equal to or more than the second predetermined opening degree. Therefore, a long time is required to obtain the required change in the exhaust gas recirculation amount, and the abnormality diagnosis time is prolonged.
- the control valve is driven to the opening side or the closing side to change the gradual change amount when the opening degree reaches the second predetermined opening degree, the predetermined change amount of the exhaust gas recirculation amount is obtained.
- the time required for diagnosis can be shortened, and the time required for diagnosis can be shortened.
- the abnormality diagnosis device prohibits the abnormality diagnosis when the opening degree of the control valve when the abnormality diagnosis condition is satisfied is less than a third predetermined opening degree. If the control valve is opened and the amount of exhaust gas recirculation is increased from a state in which the opening of the control valve is small and there is almost no exhaust gas recirculation, the engine output will decrease markedly, deteriorating dryability, and Or increase. In this regard, if the abnormality diagnosis is prohibited when the opening degree of the control valve is less than the third predetermined opening degree when the abnormality diagnosis condition is satisfied, the deterioration of the driveability and the increase in smoke are surely suppressed. . BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a schematic diagram showing a schematic configuration of a diesel engine to which an exhaust gas recirculation device according to a first embodiment of the present invention is applied.
- FIG. 2 is a flowchart illustrating an abnormality diagnosis process of the exhaust gas recirculation device according to the first embodiment.
- FIG. 3 is a flowchart illustrating an abnormality diagnosis process of the exhaust gas recirculation device according to the first embodiment.
- FIG. 4 is a time chart illustrating an example of control at the time of abnormality diagnosis according to the first embodiment.
- FIG. 5 is a flowchart illustrating an abnormality diagnosis process of the exhaust gas recirculation device according to the second embodiment.
- FIG. 6 is an explanatory diagram showing control of the opening degree of the EGR control valve in the second embodiment.
- FIG. 7 is a graph showing the relationship between the EGR opening and the amount of EGR.
- FIG. 8 is an explanatory diagram showing a change in the EGR amount based on switching of the gradually changing amount of the EGR opening.
- FIG. 9 is a schematic view showing a diesel engine according to a third embodiment of the present invention.
- FIG. 10 is a flowchart of a main routine of the abnormality diagnosis processing of the embodiment.
- FIG. 11 is a flowchart of the AFM abnormality diagnosis processing of the embodiment.
- FIG. 12 is a flowchart of the EGR abnormality diagnosis processing of the embodiment.
- FIG. 13 is a flowchart of the abnormality determination processing of the embodiment.
- FIG. 14 is a flowchart of an abnormality diagnosis process according to a further embodiment.
- an intake passage 2 is connected to a combustion chamber 12 of the diesel engine 1 via intake pulp (not shown).
- the intake passage 2 has an air cleaner 3 for filtering intake air, an air quantity sensor 6 for detecting intake air quantity, an intake air temperature sensor 32 for detecting intake air temperature, and a combustion chamber from the upstream side to the downstream side.
- a throttle valve 4 for adjusting the amount of intake air introduced into 12 is provided.
- the throttle valve 4 is opened and closed by a stepping motor 25 and a drive mechanism 5 including a gear group that connects the stepping motor 25 and the throttle valve 4.
- the step motor 25 is controlled by an electronic control unit (hereinafter referred to as “ECU”) 19 for performing various controls of the diesel engine 1. Further, the drive mechanism 5 is provided with a fully open switch 26 which is turned on when the throttle valve 4 is located closer to the open side than a predetermined position near the fully open state.
- ECU electronice control unit
- the intake passage 2 further downstream of the throttle valve 4, exhaust gas branched from an exhaust passage 7 connected to the combustion chamber 12 via an exhaust valve (not shown) and joined to the intake passage 2 is provided.
- the return (EGR) passage 8 is connected.
- the EGR passage 8 is provided with an EGR control valve 9 which is opened and closed by an actuator 10 such as a diaphragm controlled by the ECU 19.
- the amount of gas introduced into the combustion chamber 12 is constant, and the amount of intake air is adjusted by the throttle valve 4 and the amount of EGR is adjusted by the EGR control valve 9.
- the ratio of the EGR amount to the introduced intake air amount can be freely set. That is, appropriate EGR control can be performed over the entire operation range of the diesel engine 1.
- the combustion chamber 12 of the diesel engine 1 is provided with an injection nozzle 11 for directly injecting fuel.
- the fuel injection nozzle 11 is connected to a fuel injection pump 14.
- This fuel injection pump 14 is a diesel engine 1 Driven based on the rotation of the output shaft 23, the fuel is pressurized and supplied to the injection nozzle 11.
- the fuel injection pump 14 includes a timer control valve 15 and a spill valve 16 for adjusting the injection timing and the injection amount of the fuel injected from the injection nozzle 11.
- the operation of the timer control valve 15 and the spill valve 16 is also controlled by the ECU 19.
- a rotor (not shown) that rotates in synchronization with the rotation of the output shaft of the diesel engine 1 is provided in the fuel injection pump 14, and a rotation speed sensor 17 that detects the rotation speed of this rotor is provided.
- the rotation speed sensor 17 is composed of an electromagnetic pickup, detects a protrusion formed on the outer peripheral surface of the rotor, and outputs a pulse signal corresponding to the rotation speed.
- the output of the rotation speed sensor 17 is taken into the ECU 19 as a signal that contributes to the calculation of the rotation speed of the diesel engine 1.
- the ECU 19 receives information on the intake air amount detected by the air amount sensor 6 and information on the intake air temperature detected by the intake air temperature sensor 32.
- the ECU 19 also has accelerator opening information (accelerator pedal depression amount information) detected by the accelerator opening sensor 18 and IG (ignition) switch 20 on / off information, starter switch 21 on / off. Off information and cooling water temperature information detected by the water temperature sensor 30 are also taken in.
- the IG switch 20 is a switch for controlling the start and stop of the engine, and is turned on when the engine is started and turned off when the engine is stopped.
- the starter switch 21 is a switch for driving a starter motor for starting the engine.
- the starter switch 21 is turned on when the starter motor is rotating, and is turned off when the starter motor is stopped.
- the ECU 19 drives the timer control valve 15 and the spill valve 16 of the fuel injection pump 14 based on the detection signals of the above sensors, thereby Executes fuel injection amount control and fuel injection timing control of the easel engine i.
- the ECU 19 drives the step motor 25, the actuator 10 that opens and closes the EGR control valve 9, and the like based on the detection signals of the sensors, thereby performing EGR control, intake air amount control, and the like.
- the ECU 19 drives the step motor 25 and the actuator 10 in a method different from the EGR control on the basis of the detection signals of the respective sensors to diagnose the EGR device for abnormality.
- This routine is periodically executed by the ECU 19 every predetermined time, for example, every several tens of milliseconds.
- step 100 it is determined whether a precondition for abnormality diagnosis is satisfied.
- the predetermined value QF 0 is not limited to “0” and may be any value as long as it is substantially equal to or less than the idle injection amount.
- the accelerator opening is 0%, the fuel injection amount is equal to or less than the predetermined value QF0, and the rotational speed deviation ⁇ NE is less than the predetermined value NE0. 1 means that the fuel supply is stopped. Only when all of these conditions are satisfied, it is considered that the preconditions for abnormality diagnosis are satisfied.
- step 110 the value of the condition satisfaction counter is incremented.
- step 7 ° 120 it is determined whether the operation state of the diesel engine 1 is stable by determining whether the value of the condition satisfaction counter is greater than a value corresponding to the predetermined time T0. . This is because when the operation state of the diesel engine 1 is stable, the amount of intake air and the amount of EGR are also stable, and the detection accuracy of abnormality diagnosis of the EGR device can be improved. If it is determined in step 120 that the value of the condition satisfaction force counter is equal to or less than the value indicating the predetermined time T0, the present routine is terminated once.
- the opening of the throttle valve 4 is fixed to the opening at that time.
- the intake negative pressure downstream of the throttle valve 4 changes. This change in the intake negative pressure changes the EGR amount and the intake air amount. Therefore, the throttle opening is fixed at the time of abnormality diagnosis of the EGR device, so that the change of the intake air amount due to the change of the throttle opening is suppressed and the accuracy of the abnormality diagnosis of the EGR device is improved.
- next step 140 it is determined whether or not a reference learning flag indicating whether or not the measurement reference value of the intake air amount has been learned is ON. If it is determined that the reference learning flag is not ON, the measurement reference value has not been learned, so the process proceeds to step 150, and the intake air amount GA at that time is set as the measurement reference value of the intake air amount. In the next step 160, the reference learning flag is set to ON, and the process proceeds to step 180 in FIG. If it is determined in step 140 that the reference learning flag is ⁇ N, the measurement reference value has been learned, so the process proceeds to step 170 to set the target opening epegfin of the EGR control valve 9. Is done.
- This target opening epegfin is EGR controlled It is set by subtracting the gradual change “a%” from the actual opening epegact of the valve 9.
- the EGR control valve 9 is feedback-controlled to the target value.
- the gradual change “a%” is a ratio to the opening degree when the EGR control valve 9 is fully opened, and any of positive and negative values can be set as the gradual change “a”. Therefore, if the gradual change “a” is a positive value, the EGR control valve 9 is controlled so that its opening gradually decreases. Conversely, if the gradual change “a” is a negative value, the EGR control valve 9 is controlled.
- the gradual change amount “a” is a positive value or a negative value may be determined based on the actual opening of the EGR control valve 9. That is, when the actual opening degree of the EGR control valve 9 is larger than a predetermined value, the gradual change amount “a” is set to a positive value, and when the actual opening degree is equal to or less than the predetermined value, the gradual change amount “a” is set to negative. be able to.
- the predetermined value can be set, for example, to a value that is 30% open from the fully closed state of the EGR control valve 9. By doing so, it is possible to prevent erroneous detection and to minimize the occurrence of smoke and the deterioration of drivability.
- the EGR control valve 9 when the actual opening of the EGR control valve 9 is smaller than the predetermined value, even if the EGR control valve 9 is gradually closed, the change in the intake air amount is small, and there is a risk of erroneous detection. Therefore, in this case, by gradually opening the EGR control valve 9, the change in the amount of intake air becomes large to some extent, preventing erroneous detection and minimizing the generation of smoke and the deterioration of driver's piracy. Can be suppressed. Further, when the actual opening of the EGR control valve 9 is larger than a predetermined value, the abnormality diagnosis can be performed by gradually closing the EGR control valve 9 without generating smoke or deteriorating the driver's rightness.
- the measurement reference value GA is subtracted from the intake air amount corresponding to the opening of the EGR control valve 9, and the change in the intake air amount after the start of the control of the EGR control valve 9 is detected, and the change in the air amount is determined. It is determined whether or not the determination value QA is greater than 0. This air volume If it is determined that the change is larger than the determination value QAO, the process proceeds to step 190, and if it is determined that the air amount change is equal to or less than the determination value QAO, the process proceeds to step 220.
- the EGR device is diagnosed as normal, the normality determination flag indicating that the diagnostic result is normal is set to ON, and the elapsed time since the start of the opening control of the EGR control valve 9 is set. The value of the abnormal counter to be measured is cleared.
- it is determined whether or not an abnormality determination flag indicating that the EGR device is abnormal is ON. If it is determined that the abnormality determination flag is ON, the process proceeds to step 210, and if it is determined that the abnormality determination flag is $ FF, the process proceeds to step 270.
- the abnormality determination flag is set to OFF, and the diagnostic counter is cleared.
- step 180 If it is determined in step 180 that the air amount change is equal to or smaller than the determination value Q AO, the value of the abnormality counter is increased by one in step 220.
- step 230 it is determined whether or not the value of the abnormality counter is larger than a value indicating the predetermined time T1.
- This predetermined time T1 is a time when the EGR device including the EGR control valve 9 and the EGR passage 8 is normal and the gradual change of the opening degree of the EGR control valve 9 is set to ⁇ a% ''. Is set to a value exceeding the determination value Q AO. If it is determined in step 230 that the value of the abnormality counter is equal to or less than the value indicating the predetermined time T1, this routine is terminated.
- step 240 it is diagnosed that there is an abnormality in the EGR device, and the abnormality determination flag is set to ON.
- the next step 250 it is determined whether the normality determination flag is ON. You. If it is determined that the normality determination flag is ON, the process proceeds to step 260. If it is determined that the normality determination flag is OFF, the process proceeds to step 270. In step 260, the normality determination flag is set to OFF and the diagnostic counter is cleared. In step 270 following step 210 and step 260, the detection completion flag is set to ON and the value of the diagnostic counter is incremented.
- the detection completion flag and the diagnostic power counter operate only once during one vehicle deceleration. Therefore, the abnormality diagnosis is not determined during one deceleration of the vehicle. This is to prevent erroneous detection during one deceleration of the vehicle, and not to give the driver unnecessary unnecessary discomfort by not performing abnormality diagnosis once it is determined to be normal. Therefore, the diagnosis result is only confirmed after at least two vehicle decelerations. As a result, the possibility of erroneous detection can be reliably eliminated, and unnecessary execution of abnormality diagnosis processing is suppressed.
- one deceleration is a state in which the condition of step 100 is satisfied.
- the diagnostic power counter is reset and then incremented by one, so that the value of the diagnostic counter is always “1”. It becomes.
- N 2 in the present embodiment. If it is determined that the value of the diagnostic counter is 2 or more, the diagnostic decision flag is set to ON in step 290, and the diagnostic counter is cleared.
- the diagnosis confirmation flag is turned on, the abnormality diagnosis is prohibited. By doing so, the number of times of abnormality diagnosis is minimized, thereby ensuring the driver pirity and maintaining the durability of parts such as the throttle valve 4. Of course, the accuracy of abnormality diagnosis is improved.
- step 320 the condition satisfaction counter is cleared, the reference learning flag is set to OFF, and the abnormality counter is cleared. Then, in step 330, the EGR control valve 9 and the throttle valve 4 are normally driven, and this routine ends once.
- FIG. 4 is a time chart showing an example of an abnormality diagnosis process of the exhaust gas recirculation device in the diesel engine 1 configured as described above. The case where the value N of the diagnostic counter is 2 will be described. After the diesel engine 1 is started, the vehicle is driven, and the vehicle shifts to deceleration while the vehicle is running, and when the fuel supply amount becomes equal to or less than the predetermined amount, the abnormality diagnosis is performed at time t0. It is determined that the precondition is satisfied (step 100).
- step 120 If the above preconditions continue to be satisfied during the period of the predetermined time T0 from time t0 to t1, it is confirmed that the operation state of the diesel engine 1 is stable (step 120). As a result, at time t1, abnormality diagnosis is started, and the opening of the throttle valve 4 is fixed.
- the intake air amount GA at time t1 is set as a measurement reference value (step 150).
- the EGR control valve 9 is controlled such that the opening degree of the EGR control valve 9 changes by a gradually changing amount “a%” (a> 0 in this case) within a predetermined time T1 from time t1 to t2. (Step 170). If the EGR control valve 9 is normal, its opening gradually decreases.
- the EGR amount gradually decreases, and conversely, the intake air amount changes so as to gradually increase. If it is determined that the amount of change in the intake air amount is larger than the determination value QA0 within the predetermined time T1 between times t1 and t2, the normality determination flag is set to ON (step 190). At this time, if the abnormality determination flag is ON, the abnormality determination flag is set to OFF and the value of the diagnostic counter is cleared to “0”. Then, the detection completion flag is set to ⁇ N, and the diagnostic counter is incremented by one, and the value becomes “1”.
- the abnormality determination flag is set to ON (step 240). At this time, if the normality judgment flag is ON, the normality judgment flag is turned OFF and the value of the diagnostic counter is cleared to “0”. Then, the detection completion flag is set to ON, and the diagnostic counter is incremented by one, and the value becomes “1”. If the vehicle deceleration state started after time t0 continues after time t2, the detection completion flag is ON and the precondition for abnormality diagnosis is not satisfied (step 100).
- the condition satisfaction counter is cleared, the reference learning flag is set to OFF, and the abnormality counter is also tallied (step 320). Then, the EGR control valve 9 and the throttle valve 4 are normally driven to execute the EGR control.
- the vehicle speed becomes equal to or lower than the predetermined vehicle speed SPD at time t3
- the detection completion flag is set to OFF (step 340). ).
- the accelerator is depressed and the vehicle shifts to normal running, and again, the vehicle shifts to decelerating running and the fuel supply amount becomes equal to or less than a predetermined amount
- the precondition for abnormality diagnosis is satisfied at time t4.
- step 100 If the above preconditions continue to be satisfied during the period of the predetermined time T0 from time t4 to t5, it is confirmed that the operation state of the diesel engine 1 is stable (step 120). As a result, abnormality diagnosis is started at time t5, and the opening of the throttle valve 4 is fixed.
- the intake air amount GA at time t5 is set as a measurement reference value (step 150).
- the EGR control valve 9 is controlled such that the opening degree of the EGR control valve 9 changes by the gradually changing amount "a%"(a> 0 in this case). Step 1 70).
- the EGR control valve 9 If the EGR control valve 9 is normal, its opening gradually decreases, and as the opening of the EGR control valve 9 decreases, the EGR amount gradually decreases, and conversely, the intake air amount gradually decreases. Vary to increase. If it is determined that the amount of change in the intake air amount is larger than the determination value QA0 within the predetermined time T1 from the time t5 to t6, the normality determination flag is set to ON (step 190). At this time, if the abnormality determination flag is ON, the abnormality determination flag is turned OFF and the value of the diagnostic counter is cleared to “0”. Then, the detection completion flag is set to ⁇ N, and the diagnostic counter is incremented by one, and the value becomes “1”.
- the abnormality determination flag is set to ON (step 240). At this time, if the normality judgment flag is ON, the normality judgment flag is turned OFF and the value of the diagnostic counter is cleared to “0”. Then, the detection completion flag is set to ⁇ N, and the diagnostic counter is incremented by one, and the value becomes “1”. Therefore, the value of the diagnosis counter is “2” only when the diagnosis result of the abnormality diagnosis at the time t1 to t2 and the diagnosis result of the abnormality diagnosis at the time t5 to t6 are the same.
- the diagnostic confirmation flag is set to ON, the diagnostic result is confirmed, and the diagnostic counter is cleared. If the vehicle deceleration state started after time t4 continues after time t6, the detection completion flag is ON, and the precondition for abnormality diagnosis is not satisfied (step 100). Therefore, at time t6, the condition satisfaction counter is cleared, the reference learning flag is set to OFF, and the abnormal force counter is cleared (step 320), and the EGR control valve 9 and the throttle valve 4 are driven normally to stop the operation. GR control is executed.
- the detection completion flag is set to OFF (step 340). After that, even if the accelerator is depressed and the vehicle shifts to normal running, and the vehicle shifts again to decelerating running, the diagnosis confirmation flag is ON and the precondition for abnormality diagnosis is not satisfied (step 100). ). After the diagnosis confirmation flag is set to ON, the diagnosis confirmation flag is set to OFF based on the stoppage of diesel engine 1! /.
- the diagnosis result of the abnormality diagnosis of the EGR device is determined during the operation of the diesel engine 1, the abnormality diagnosis of the EGR device is repeatedly executed within one trip from the start and the stop of the diesel engine 1. None. According to the present embodiment described above, the following effects can be obtained.
- the EGR control valve 9 is controlled so that the opening degree of the EGR control valve 9 changes gradually. Therefore, if the EGR device does not malfunction, the EGR amount does not change or does not rapidly increase or decrease, and the EGR amount gradually changes.
- Such a change in the exhaust gas recirculation amount causes a change in the intake air amount of the EGR passage 8, and the change amount of the EGR amount can be obtained by detecting the change amount of the intake air amount in the predetermined time T1. .
- the change amount of the intake air amount during the predetermined time T1 during the control of the EGR control valve 9 is equal to or less than the determination value QA0, it can be diagnosed that the EGR device is abnormal, and the abnormality diagnosis of the EGR device can be performed. It can be done easily and reliably. Moreover, since the EGR amount does not increase or decrease rapidly during the EGR device abnormality diagnosis, it is possible to suppress the deterioration of the exhaust emission of the diesel engine 1 and to suppress the change in the combustion state and the engine output. Abrupt fluctuations can be reduced, and deterioration of drivability can be suppressed. (2) The ECU 19 performs the abnormality diagnosis of the EGR device when the operation state of the diesel engine 1 is stable. Therefore, a change in the intake air amount based on a factor other than the opening control of the EGR control valve 9 can be suppressed, and the accuracy of abnormality diagnosis of the EGR device can be improved.
- the ECU 19 performs the abnormality diagnosis of the EGR device when the fuel supply amount during the vehicle deceleration is equal to or less than a predetermined amount. Since combustion is not performed when the fuel supply amount of the diesel engine 1 is equal to or less than a predetermined amount, it is possible to reliably suppress the deterioration of the exhaust emission at the time of abnormality diagnosis of the EGR device.
- the system configuration of the internal combustion engine and its control device is the first embodiment. It is the same as the state.
- the actual opening epegfin of the EGR control valve 9 when setting the target opening epegfin of the EGR control valve 9 in the abnormality diagnosis of the EGR device, the actual opening epegact of the EGR control valve 9 is not considered, and the EGR control valve 9 is not considered. From the actual opening degree epegact of, the fixed variable “a” was reduced. When the gradual change “a” is a positive value, the EGR control valve 9 is driven to the closed side, and the gradual change
- FIG. Fig. 5 is a flowchart showing a part of the abnormality diagnosis processing of the EGR device executed by the ECU 19, and this processing is a part of the abnormality diagnosis processing in the first embodiment. This is a modification of steps 140, 150, 160, and 170.
- this processing is started, the processing of steps 100, 110, 120, and 130 is sequentially performed. At the time, learning of the reference value for the intake air volume was not yet completed.
- the flag is determined not O N,
- a predetermined value A is a ratio to the opening degree when the EGR control valve 9 is fully opened, and in this case, A is set to 50%.
- a predetermined value B is a ratio to the opening degree when the EGR control valve 9 is fully opened, and in this case, B is set to 30%. If it is determined that the actual opening epegact is greater than or equal to the predetermined value B, the process proceeds to step 440. If it is determined that the actual opening epegact is less than the predetermined value B, the process proceeds to step 450.
- step 420 the gradual change amount epegadd force S for setting the target opening epegfin of the EGR control valve 9 is set to "1 m%".
- the sign “1” indicates that the driving direction of the EGR control valve 9 is set to the closing side
- “m” is a ratio to the opening degree when the EGR control valve 9 is fully opened. Which is a positive value. Therefore, the drive of the EGR control valve 9 is controlled to the closing side based on the gradual change amount “1 m%”.
- step 440 the gradual change amount epegadd force S of the opening degree of the EGR control valve 9 is set to “+ n%”.
- the sign “+” indicates that the drive direction of the EGR control valve 9 is set to the open side, and “n” is the ratio to the opening when the EGR control valve 9 is fully opened. Is a positive value. Therefore, the drive of the EGR control valve 9 is controlled to open based on the gradual change amount “+ n%”.
- the EGR control valve 9 is driven to the closed side, the amount of EGR decreases and the amount of intake air increases, so that a decrease in the output of the diesel engine 1 is suppressed and dryability is maintained.
- the gradual change amount m on the closed side and the gradual change amount n on the open side are set to have a relationship of m> n.
- the EGR control valve 9 when the opening of the EGR control valve 9 at the start of driving is equal to or more than the predetermined value A (50%) as shown in the example EX1 in FIG. 6, the EGR control valve 9 is driven to the closing side. The total drive amount of the EGR control valve 9 can be increased. If the opening of the EGR control valve 9 at the start of driving is less than the predetermined value A (50%) as shown in the example EX 2 in FIG. 6, the EGR control valve 9 should be driven to the open side. Accordingly, the total drive amount of the EGR control valve 9 can be increased.
- step 450 the gradual change amount 6 pegadd of the opening degree of the £ 01 control valve 9 is set to “0%”, and the detection completion flag is set to ON.
- the detection completion flag is set to ON in step 450 in this way, when the routine of the abnormality diagnosis process is next executed, it is determined in step 100 that the abnormality diagnosis condition is not satisfied, and Diagnosis processing is prohibited.
- step 450 the intake air amount GA at that time is set as a measurement reference value of the intake air amount.
- step 470 the reference learning flag is set to ON, and the process proceeds to step 180. If it is determined in step 140 that the reference learning flag is ON, the process proceeds to step 480 because the measurement reference value has been learned.
- step 480 it is determined whether the gradual change amount 6 pegadd of the opening degree of the control valve 9 is less than zero.
- the process proceeds to step 490, and when it is determined that the gradual change amount epegadd is 0 or more, the process proceeds to step 510.
- step 49 it is determined whether or not the actual opening epegact of the EGR control valve 9 at that time is equal to or less than a predetermined value C as a second predetermined opening.
- This predetermined value C is a ratio to the opening degree when the EGR control valve 9 is fully opened, and in this case, C is set to 50%.
- step 510 it is determined whether or not the actual opening degree epegact of the EGR control valve 9 at that time is equal to or greater than a predetermined value D as a second predetermined opening degree.
- This predetermined value D is a ratio to the opening degree when the EGR control valve 9 is fully opened, and in this case, D is set to 50%. If it is determined that the actual opening epegact at this time is equal to or more than the predetermined value D, the process proceeds to step 520, and if it is determined that the actual opening epegact is less than the predetermined value D, the process proceeds to step 530 .
- This correction coefficient is set to be 1 ⁇ . Therefore, the new gradual change amount epegadd set in this way is changed to a large value.
- the degree of opening of the EGR control valve 9 is equal to or greater than the predetermined values C and D, as shown in FIG. This is because the sensitivity of the change is reduced.
- the gradual change amount of the EGR control valve 9 When the gradual change amount of the EGR control valve 9 is set to a constant value, the change amount of the EGR amount becomes small when the opening degree of the EGR control valve 9 is equal to or more than the predetermined values C and D, and the required change amount of the EGR amount is reduced. It takes a long time to get. Therefore, when the opening degree of the EGR control valve 9 is equal to or more than the predetermined values C and D, the time for obtaining the predetermined change amount of the EGR amount is shortened by changing the gradual change amount epegadd to a large value. I have. That is, as shown in FIG.
- the gradual change amount is set to a value larger than the above-mentioned constant value, and In order to obtain the amount of change in the EGR amount equivalent to the determination value QA0, the time from the drive start timing t10 of the EGR control valve 9 to the time t11 only needs to be obtained. The time required to obtain the amount of change can be reduced.
- the EGR The target opening epegfin of the valve 9 is set. The target opening epegfin is set by adding the gradual change amount epegadd set in step 420, 440, 500 or 520 to the actual opening epegact of the EGR control valve 9.
- the EGR control valve 9 is feedback-controlled to the target value, and the actual opening immediately before the shift, which is stored when shifting to this routine, becomes the initial value. Therefore, if the gradual change amount epegadd is a negative value, the EGR control valve 9 is controlled to the closing side so that its opening gradually decreases, and if the gradual change amount epegadd is a positive value, The control valve 9 is controlled to open so that its opening gradually increases.
- the drive direction of the EGR control valve 9 is set to open or close based on the opening of the EGR control valve 9 when the abnormality diagnosis condition is satisfied. did. Therefore, the total drive amount of the EGR control valve 9 can be secured, the amount of change in the EGR amount can be equal to or more than a predetermined amount, and abnormality diagnosis can be performed reliably.
- the gradual change amount for driving the EGR control valve 9 to the closed side is set to a value larger than the gradual change amount for driving the EGR control valve 9 to the open side.
- the EGR control valve 9 is driven to the closing side, the amount of EGR decreases and the amount of intake air increases, so that a decrease in engine output can be suppressed and drivability can be maintained.
- the EGR control valve 9 is driven to the open side, the EGR amount increases, the intake air amount decreases, the engine output decreases, and the drivability deteriorates. Since the gradual change amount for driving the GR control valve 9 to the open side is set to a small value, it is possible to suppress deterioration of drivability. Accordingly, whether the EGR control valve 9 is driven to the open side or the closed side, the abnormality diagnosis of the exhaust gas recirculation device can be performed while suppressing the deterioration of drivability.
- the abnormality diagnosis is prohibited when the actual opening epegact of the EGR control valve 9 when the abnormality diagnosis condition is satisfied is less than the third predetermined opening (predetermined value B).
- predetermined value B the third predetermined opening
- the fact that the amount of change in vehicle speed is less than a predetermined value may be used.
- the abnormality determination flag is set to ON in step 240.
- An abnormality measurement counter may be provided in place of the abnormality determination flag, and if an abnormality is detected a plurality of times at every predetermined time T 1, it may be determined that the EGR device is abnormal.
- the predetermined value A for setting the gradual change amount of the EGR control valve 9 is The predetermined value A is calculated based on the engine speed and the opening of the throttle valve 4 or refers to a map defined by the engine speed and the opening of the throttle valve 4. You may ask for it. Further, the predetermined value A may be obtained based on the engine speed and the intake pressure.
- the predetermined values C and D for changing the gradual change amount of the EGR control valve 9 are set to the same value, but they may be set to different values. In addition, the predetermined values C and D are set to constant values. However, the predetermined values C and D are calculated based on the engine speed and the opening of the throttle valve 4, or the engine speed and the opening of the throttle valve 4 are determined.
- the abnormality diagnosis device of the EGR device of the diesel engine 1 is embodied.
- the abnormality diagnosis device of the EGR device of the gasoline engine may be embodied.
- the abnormality diagnosis may be performed based on the change in the intake pressure in the EGR passage 8 instead of the change in the intake air amount.
- the intake pressure in the EGR passage 8 changes in accordance with such a change in the exhaust gas recirculation amount, and the change in the EGR amount can be obtained by detecting the change in the intake pressure in a predetermined time. Therefore, when the amount of change in the intake pressure during a predetermined time during the control of the EGR control valve 9 is equal to or smaller than a predetermined determination value, it can be diagnosed that there is an abnormality in the EGR device. It can be done easily and reliably.
- the abnormality diagnosis of the EGR device of the diesel engine 1 is performed based on the change amount of the intake air amount. However, instead of the change amount of the intake air amount, the intake pressure of the EGR passage 8 is changed. The abnormality diagnosis may be performed based on the amount of change. (Third embodiment)
- An intake passage 51 and an exhaust passage 53 are connected to a combustion chamber 52 of the diesel engine 50 shown in FIG.
- the intake passage 51 has an air cleaner 54 that filters intake air from the upstream side to the downstream side, an air flow meter 55 that measures the amount of intake air, and an intake passage 51 that changes the flow passage area of the intake passage 51.
- a throttle valve 56 for adjusting the amount is provided.
- the throttle valve 56 is opened and closed by a step motor 58 connected through a power transmission mechanism 59 having a gear group.
- the step motor 58 is driven and controlled by an electronic control unit (ECU) 70 that controls various controls of the diesel engine 50.
- ECU electronice control unit
- the power transmission mechanism 59 is provided with a fully open switch 56a for confirming that the throttle valve 56 is located at the fully open position.
- the ECU 70 determines the opening of the throttle valve 56 (throttle opening) based on the step position of the step motor 58 relative to the fully open position confirmed by the fully open switch 56a. I'm gripping. Downstream of the throttle valve 56 of the intake passage 51, an intake pressure sensor 57 for measuring the internal pressure (intake pressure) of the intake passage 51 is provided, and the intake passage 51 branches off from the exhaust passage 53.
- the EGR passage 60 that joins with the EGR is connected.
- An EGR control pulp 61 that is opened and closed by an actuator 62 such as a diaphragm controlled by the ECU 70 is provided in the EGR passage 60.
- an EGR device is constituted by the EGR passage 60, the EGR control pulp 61, the actuator 62, and the like.
- the ECU 70 adjusts the flow rate of the gas introduced into the combustion chamber 52 through the opening control of the throttle pulp 56 and controls the opening of the EGR control valve 61.
- the flow rate (EGR amount) of the exhaust gas recirculated to the intake passage 51 is adjusted.
- the opening of the EGR control valve 61 is changed while keeping other conditions such as the throttle opening constant, the total flow rate of the gas introduced into the combustion chamber 52 is kept constant, and the EGR amount is kept constant. Changes. Therefore, by controlling the opening of the throttle valve 56 and the EGR control valve 61, it is possible to freely control the total flow rate of the gas introduced into the combustion chamber 52 and the ratio of the exhaust gas to the gas (EGR rate). Can be.
- EGR control can be performed over a wide operating range of the diesel engine 50.
- the air flow meter 55 provided upstream of the junction of the intake passage 51 with the EGR passage 60, the flow rate of gas introduced into the combustion chamber 52 excluding EGR, that is, the flow rate of air taken in from the outside Only will be detected.
- an injector 63 is provided in the combustion chamber 52 of the diesel engine 50.
- the diesel engine 50 employs a common rail type fuel supply device, and is provided with a common rail 65 for storing fuel pumped by a fuel supply pump 64 from a fuel tank (not shown).
- the drive of the fuel supply pump 64 is controlled by the ECU 70, and the pressure of the fuel in the common rail 65 is optimally maintained by adjusting the amount of fuel supplied from the pump 64.
- the high-pressure fuel stored in the common rail 65 is distributed and supplied to the injector 63 of each cylinder of the diesel engine 50.
- the injector 63 is driven by the ECU 70, and injects an optimal amount of fuel into the combustion chamber 52 at an optimal timing based on a command from the ECU 70.
- the ECU 70 has an NE sensor 67 for detecting the engine speed ne, an accelerator sensor 68 for detecting the accelerator pedal depression amount accp, and a vehicle speed spd for detecting the engine speed ne by the air flow meter 55 and the intake pressure sensor 57.
- FIG. 10 shows a main routine of the abnormality diagnosis processing in the present embodiment. The processing of this routine is periodically executed by the ECU 70.
- step 610 it is determined whether or not the abnormality diagnosis execution condition is satisfied. Specifically, when all of the following conditions (a) to (c) are satisfied for a predetermined time T1 or more until the present time, the abnormality diagnosis execution condition is satisfied.
- the fuel injection amount is equal to or less than a predetermined value QF0.
- the deviation ⁇ of the rotation speed of the engine 50 is less than the predetermined value NE 0.
- the predetermined value QF 0 is set to a value smaller than the fuel injection amount during idling, and under such conditions, the fuel is hardly burned in the combustion chamber 52. Therefore, the fulfillment of all of the above conditions (a) to (c) means that the fuel is being cut during vehicle deceleration. If such a state continues for a predetermined time T1 or more, it can be determined that the operating state of the diesel engine 50 is stable.
- control of the throttle valve 56 and EGR control valve 61 for abnormality diagnosis can be controlled by driver pillar and engine
- the ECU 70 proceeds to step 6 In 90, the value of each counter C 1 through C 3, and the measurement reference value G AO a click each Riashi, after setting the AFM (Air Flow Meter) off the determination completion flag, while ⁇ which terminates the processing of this routine is once If the abnormality diagnosis execution condition is satisfied (S610: YES),
- diagnosis completion flag it is determined whether the diagnosis completion flag is ON. If the diagnosis completion flag is on, the ECU 70 ends the processing of this routine.
- the diagnosis completion flag is turned on when the current abnormality diagnosis is completed and any diagnosis result (any of the air flow meter 55 abnormality determination, the EGR normality determination, and the EGR abnormality determination) is issued. Therefore, the diagnosis result is issued only once during one vehicle deceleration.
- the diagnostic completion flag is set to ON, it is reset to OFF when the vehicle comes to a stop (including a slow running state).
- step 630 it is determined whether or not the AFM (air flow meter) determination completion flag is on.
- the AFM determination completion flag is turned on when the determination of the presence or absence of an abnormality is completed in the “AFM abnormality diagnosis process” for determining whether or not the air flow meter 55 has an abnormality.
- the ECU 70 shifts the processing to step 640, and executes the AFM abnormality diagnosis processing shown in FIG. That is, until the determination of the presence or absence of the abnormality of the air flow meter 55 in the AFM abnormality diagnosis processing is completed, the processing after step 650 is not executed.
- the ECU 70 performs the EGR cut in step 700, that is, closes the EGR control valve 61 completely to stop the recirculation of the exhaust gas to the intake passage 51. Then, in step 710, the ECU 70 calculates the theoretical value gath of the intake air amount from the throttle opening at that time. During the EGR cut, all the gas introduced into the combustion chamber 52 becomes air taken in from the outside, and is taken into the combustion chamber 52 by the flow rate of the gas flowing through the portion of the intake passage 51 where the air flow meter 55 is provided.
- step 720 the intake air amount actually detected by the air flow meter 55, that is, the actually measured value ga of the intake air amount is read, and in the next step 730, the difference between the actually measured value ga and the theoretical value gath (
- step 750 the ECU 70 turns on the AFM determination completion flag and ends the processing of this routine.
- step 760 the AFM abnormality determination counter C1 is incremented.
- step 770 it is determined whether or not the value of the counter C 1 exceeds a predetermined value T1. If the value of the counter C1 is equal to or smaller than the predetermined value T1, the process of this routine is immediately terminated.
- step 780 the AFM abnormality determination flag is turned on. Also, if the AFM normality judgment flag was turned on in the previous AFM abnormality diagnosis processing, the flag is turned off. Further, the ECU 70 turns on the AFM abnormality history flag, turns on the AFM determination completion flag in step 750, and ends the processing of this routine.
- the FM history flag is set on, it remains on until the identification switch turns off. Therefore, if an abnormality is determined in the AFM abnormality diagnosis process, and if a normal determination is made in the subsequent process, the AFM abnormality determination flag is turned off from on, whereas the AFM abnormality history flag is Is kept as is. Note that the determination of the abnormality of the air flow meter 55 is temporary, and has not been determined at this time. The determination of the abnormality determination is performed in “abnormality determination processing” described later.
- the AFM abnormality diagnosis process described above is performed after the abnormality diagnosis execution condition is satisfied, until the execution condition is not satisfied ⁇ Normal judgment or abnormality judgment is made and either the AFM judgment completion flag is turned on It will be executed repeatedly.
- step 630 of the main routine in FIG. 10 if the determination by the AFM abnormality diagnosis processing described above has been completed and the AFM determination completion flag has been turned on (YES), then in step 650, the AFM It is determined whether or not the determination flag is on.
- the AFM normality determination flag is on (YE S)
- step 660 If the flag is off (S660: NO), in step 670, the processing of the ECU 70 shifts to “EGR abnormality diagnosis processing” shown in FIG.
- the ECU 70 ends the processing of this routine as it is. That is, in this routine, even if the air flow meter 55 is determined to be normal in the current abnormality diagnosis, if the air flow meter 55 is determined to be abnormal once even after the diesel engine 50 is started, the EGR abnormality diagnosis processing is performed. Try not to run.
- step 810 it is determined whether or not the measurement reference value GA0 has been learned in the current abnormality diagnosis. If the measurement reference value G AO has not been set (S810: NO), in step 220, the actual measurement value ga of the current intake air amount is measured. The reference value is set as GAO, and the process ends. If the measurement reference value GA0 has been learned (S810: YES), in the following step 830, the target opening epegfin of the EGR control valve 61 is set. The target opening epegfin is set by adding the gradually changing amount “a%” to the actual opening epegac ⁇ of the EGR control valve 61. The variable “a%” is set to, for example, about 10%.
- the target opening epegfin and the actual opening epegact are set as ⁇ % when the EGR control valve 61 is fully closed and 100% when fully opened. Therefore, the EGR control valve 61 is controlled so that its opening gradually increases.
- the AFM abnormality diagnosis processing is always executed prior to the execution of the EGR abnormality diagnosis processing.
- the EGR power check is performed. (Step 700 in Figure 11). Accordingly, during the EGR system abnormality determination, the EGR control valve 61 is gradually controlled from the fully closed state to the valve opening side.
- the theoretical value ⁇ gath of the change amount of the intake air amount is calculated from the actual opening degree epegact of the EGR control valve 61.
- the amount of change in the amount of intake air here indicates the amount of change in the amount of intake air between the time when the above-mentioned measurement reference value GAO is learned and the current time.
- the throttle opening is fixed, the total flow rate of the gas introduced into the combustion chamber 52 is kept almost constant, so that the change in the intake air amount here is almost the same as the EGR amount at that time.
- the EGR amount estimated from the actual opening epegact of the EGR control valve 61 is obtained as the theoretical value ⁇ gath of the change amount of the intake air amount.
- the ECU 70 reads the actual measured value ga of the intake air amount at that time detected by the air flow meter 55, and in step 860, the ECU 70 reads the measured intake air amount from the measurement reference value GA0. By subtracting the measured value ga, the measured value ⁇ ga of the change amount of the intake air amount is obtained.
- step 870 it is determined whether or not the difference between the measured value ⁇ ga of the change amount of intake air amount and the theoretical value ⁇ gath obtained as described above exceeds a predetermined determination value. That is, here, it is determined whether or not a significant difference is observed between the actually measured value ⁇ ga and the theoretical value ⁇ gath.
- the measured value ⁇ ga and the theoretical value ⁇ gath should take almost the same value. If the difference (
- the processing of this routine is temporarily terminated. In this case, as long as the abnormality diagnosis execution condition is satisfied, the processing of this routine is executed again. If the value of the counter C2 exceeds the predetermined value T2 (S900: YES), that is, if the difference between the actually measured value ⁇ ga and the theoretical value ⁇ gath exceeds the judgment value, If it has continued for a certain period of time or more, the ECU 70 sets the EGR abnormality determination flag to ON and the diagnosis completion flag to ON in step 910, and ends the processing.
- the diagnosis end flag is set to ON, and the current abnormality diagnosis is completed.
- the above is the details of the EGR abnormality diagnosis processing. As described above, in the present embodiment, only when it is confirmed that the air flow meter 55 has no abnormality, the abnormality determination of the EGR based on the intake air amount detected by the air flow meter 55 is performed. Has become. By the way, in the above AFM abnormality diagnosis processing, even if the AFM abnormality determination flag is turned on, it cannot be immediately determined that the air flow meter 55 has an abnormality.
- step 650 of the main routine in FIG. 10 if the AFM normality determination flag is off (S650: N ⁇ ), that is, if the AFM abnormality determination flag is set on by the AFM abnormality diagnosis processing, In step 640, the ECU 70 proceeds to “abnormality determination processing” shown in FIG. 13 and specifies an abnormal part there.
- FIG. 13 shows a flowchart of the abnormality determination processing.
- ECU 70 Abnormal sites are identified by repeatedly executing the processing of one chin as necessary.
- the ECU 70 first executes an EGR cut in step 1000.
- a theoretical value pm th of the intake pressure is calculated from the throttle opening.
- the intake pressure can be uniquely obtained as a function of the throttle opening, as with the intake air amount.
- step 1020 the measured value pm of the intake pressure detected by the intake pressure sensor 57 is read, and in the next step 1030, the difference between the measured value pm and the theoretical value pmt h (
- pmt h -pm I) is equal to or smaller than the determination value y (S 1030: NO)
- the diagnosis completion flag is turned on in step 1040 to complete the current abnormality diagnosis. Thereby, the abnormality determination of the air flow meter 55 is determined.
- step 1050 when the difference (
- the intake pressure sensor 57 detects inappropriate detection results It can be determined that it is outputting. If it is considered that the simultaneous failure of the air flow meter 55 and the intake pressure sensor 57 is almost impossible, it can be determined that the sticking abnormality of the EGR control valve 61 has occurred in this case. Therefore, in this case, in step 1070, the EGR abnormality determination flag is set to ON, and the AFM abnormality determination flag that has been set to ON in the previous AFM abnormality diagnosis processing is reset to OFF.
- step 1040 the diagnosis completion flag is set to ON, the diagnosis result indicating that there is an abnormality in the EGR system is determined, and the current abnormality diagnosis is completed.
- This abnormality determination processing is repeatedly executed as long as the abnormality diagnosis execution condition is satisfied, until the diagnosis completion is set to ON.
- the above is the details of the abnormality determination processing.
- the abnormality diagnosis performed as described above is repeatedly performed every time the vehicle is decelerated. In this embodiment, when the same diagnostic result (AFM abnormality determination, EGR normality determination, or EGR abnormality determination) is detected continuously for a predetermined number of times, the diagnosis result is determined to be determined, and during the trip, Abnormality diagnosis is not performed. According to the embodiment described above, the following effects can be obtained.
- the diagnosis of the EGR device is performed based on the intake air amount detected by the air flow meter 55.However, prior to the determination, the abnormality diagnosis of the air flow meter 55 is performed, and the abnormality of the air flow meter 55 is determined. When it is confirmed that there is, abnormality diagnosis of the EGR device is not performed. As a result, abnormality diagnosis using the measured value of the failed air flow meter 55 is prevented, and abnormality of the EGR can be detected more accurately.
- the abnormality diagnosis of the air flow meter 55 is performed immediately before the abnormality diagnosis of the EGR device. Therefore, the abnormality diagnosis of the EGR device can be performed in a state where the normality of the air flow meter 55 is further guaranteed, and the detection accuracy of the abnormality of the EGR device can be further improved.
- the EGR cut is performed during the abnormality diagnosis of the air flow meter 55, and the control for forcibly changing the opening of the EGR control valve 61 during the abnormality diagnosis of the EGR device is performed.
- the normal EGR control is interrupted during the diagnosis.
- the abnormality diagnosis of the EGR device is continuously performed immediately after the abnormality diagnosis of the air flow meter 55, so that the number of times such normal EGR control is interrupted can be reduced.
- the abnormality diagnosis of the EGR device is performed by controlling the opening degree of the EGR control valve 61 to be gradually changed. Therefore, the EGR amount does not change suddenly at the time of judgment, and the sudden change in the EGR amount affects the operation of the engine 50.
- the abnormality diagnosis of the EGR device can be similarly performed by using the change amount of the intake pressure detected by the intake pressure sensor 57 instead of the change amount of the intake air amount to be changed. In this case, too, the abnormality diagnosis of the intake pressure sensor 57 is performed in advance, and if the abnormality of the intake pressure sensor 57 is confirmed, the abnormality diagnosis of the EGR device using the measured value of the intake pressure sensor 57 is prohibited. If so, the accuracy of abnormality diagnosis can be improved as well.
- FIG. 14 is a flowchart illustrating an outline of a processing procedure of the ECU 70 in the abnormality diagnosis of the EGR device. Also in the abnormality diagnosis by the routine in FIG. 14, prior to the abnormality diagnosis of the EGR device, first, the abnormality diagnosis of the air flow meter 55 is performed (S1100). This abnormality diagnosis is performed through the above-described AFM abnormality diagnosis processing. That is, the processing of the flowchart in FIG. 11 is repeatedly executed as necessary.
- the abnormality diagnosis at this time is performed through a process in which the amount of change in the intake air pressure is used instead of the amount of change in the amount of intake air in the EGR abnormality diagnosis process described above. That is, in step 840 of FIG. 12, the theoretical value of the change in the atmospheric pressure is obtained from the actual opening epegact of the EGR control pulp 61, and the step 806 is obtained from the actual measured intake pressure read in step 850. At 0, the actual measured value of the intake pressure change amount is obtained. Then, in step 870, it is determined whether or not the difference between the theoretical value and the actually measured value of the amount of change in intake pressure exceeds a predetermined determination value. Of course, the measurement reference value learned in step 820 is also based on the actually measured intake pressure at that time.
- an abnormality of the intake pressure sensor is diagnosed prior to the abnormality diagnosis of the EGR device. If no abnormality is detected in the intake pressure sensor, the amount of change in the intake pressure is used. An abnormality diagnosis of the EGR device may be performed using the amount of change.
- the contents of the execution conditions of the abnormality diagnosis for determining whether or not the condition is satisfied in step 61 of FIG. 10 may be changed as appropriate.
- the above execution conditions should be adjusted so that the control of the throttle valve 56 and the EGR control pulp 61 in the abnormality diagnosis has little effect on the operation of the diesel engine 50 and the abnormality diagnosis is performed in a condition where the engine operation state is stable. It is desirable to set.
- the abnormality diagnosis of the air flow meter 55 and the abnormality diagnosis of the EGR device are performed continuously, but the abnormality diagnosis is performed at different times or in different situations. May be.
- the abnormality diagnosis of the EGR device can be performed by using the change amount of the intake air amount or the change amount of the intake pressure. If the engine control amount changes, the EGR device abnormality diagnosis can be performed using the change amount. For example, if the engine includes a sensor that measures the intake pressure of the EGR passage 60, abnormality diagnosis can be performed based on the amount of change in the intake pressure of the EGR passage 60.
- the air flow meter 55 is confirmed to be abnormal once even by the processing of step 66 in FIG. 10, even when the air flow meter 55 is subsequently confirmed to be normal, although it is not determined whether there is an abnormality in the EGR device, such a process may be omitted. That is, when the air flow meter 55 in which the abnormality has been previously confirmed has returned to the normal state, the execution of the abnormality determination of the EGR device may be permitted.
- the presence or absence of an abnormality in the air flow meter 55 may be confirmed by a method different from the method based on the AFM abnormality diagnosis processing in FIG.
- the air flow meter 55 when the air flow meter 55 is determined to be abnormal (AFM abnormality determination flag is turned on) by the AFM abnormality diagnosis processing, similar abnormality determination is performed using the measured value of the intake pressure sensor 57.
- An abnormal confirmation process for specifying an abnormal part is performed. Such an abnormal part may be specified by another method. Further, such an abnormal portion need not be specified immediately after the air flow meter 55 determines the abnormality. Furthermore, if it is only necessary to confirm that there is some abnormality without identifying the abnormal site, the identification of such an abnormal site may be omitted.
- the determination of the presence or absence of an abnormality in the EGR device in the above embodiment need not always be performed with the throttle opening fixed.
- the throttle opening is changed, the amount of intake air changes, but such a change in the amount of intake air can be obtained theoretically. Therefore, taking into account the change in throttle opening and the change in the opening of the EGR control valve 61, the theoretical value of the amount of change in the amount of intake air is determined, and this is detected by the air flow meter 55. By comparing the measured value of the change in the intake air amount with the measured value, it is possible to determine whether the EGR device is abnormal.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01272278A EP1347166B8 (en) | 2000-12-26 | 2001-12-21 | Failure diagnosing device for exhaust gas recycling device |
PL357588A PL202681B1 (pl) | 2000-12-26 | 2001-12-21 | Urządzenie diagnostyczne do wykrywania nieprawidłowości w układzie recyrkulacji spalin |
ES01272278T ES2397224T3 (es) | 2000-12-26 | 2001-12-21 | Dispositivo para el diagnóstico de fallos para dispositivos de reciclaje de gases de escape |
HU0300031A HU228549B1 (hu) | 2000-12-26 | 2001-12-21 | Berendezés egy kipufogógáz visszakeringetõ rendszer rendellenes mûködésének a diagnosztizálására |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-395609 | 2000-12-26 | ||
JP2000395609 | 2000-12-26 | ||
JP2001-223523 | 2001-07-24 | ||
JP2001223523A JP4415515B2 (ja) | 2000-12-26 | 2001-07-24 | 排気還流装置の異常診断装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002052143A1 true WO2002052143A1 (fr) | 2002-07-04 |
Family
ID=26606699
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/011234 WO2002052143A1 (fr) | 2000-12-26 | 2001-12-21 | Dispositif de diagnostic de defaillance destine a un dispositif de recyclage de gaz d'echappement |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1347166B8 (ja) |
JP (1) | JP4415515B2 (ja) |
CZ (1) | CZ299066B6 (ja) |
ES (1) | ES2397224T3 (ja) |
HU (1) | HU228549B1 (ja) |
PL (1) | PL202681B1 (ja) |
WO (1) | WO2002052143A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220298993A1 (en) * | 2021-03-16 | 2022-09-22 | Toyota Jidosha Kabushiki Kaisha | Egr valve deterioration degree calculation system, control device for internal combustion engine, and vehicle |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10257568A1 (de) * | 2002-12-10 | 2004-07-01 | Adam Opel Ag | Verfahren und Einrichtung zur Regelung der Abgasrückführung bei Verbrennungsmotoren |
JP3868926B2 (ja) * | 2003-06-03 | 2007-01-17 | ヤンマー株式会社 | ディーゼル機関の排気ガス還流制御装置 |
JP2006242080A (ja) | 2005-03-02 | 2006-09-14 | Denso Corp | 排気還流装置の異常診断装置 |
JP4687485B2 (ja) * | 2006-02-06 | 2011-05-25 | トヨタ自動車株式会社 | リニア制御弁の品質不良の検査方法、及び、検査装置 |
FR2903774B1 (fr) * | 2006-07-17 | 2008-09-05 | Renault Sas | Procede de validation d'un diagnostic de fontionnement d'un dispositif. |
DE102007009689B4 (de) * | 2007-02-28 | 2017-10-19 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Brennkraftmaschine mit Abgasrückführung |
JP4502035B2 (ja) * | 2008-03-28 | 2010-07-14 | トヨタ自動車株式会社 | 排気再循環装置の異常診断装置 |
JP2009257280A (ja) * | 2008-04-21 | 2009-11-05 | Toyota Motor Corp | 排気再循環システムの診断装置 |
US9010113B2 (en) | 2009-09-24 | 2015-04-21 | Toyota Jidosha Kabushiki Kaisha | Control apparatus of an internal combustion engine |
JP5515830B2 (ja) * | 2010-02-17 | 2014-06-11 | トヨタ自動車株式会社 | 排気還流装置の異常検出装置 |
JP6123646B2 (ja) * | 2013-11-18 | 2017-05-10 | トヨタ自動車株式会社 | 内燃機関の診断装置 |
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JPH0323356A (ja) * | 1989-06-19 | 1991-01-31 | Honda Motor Co Ltd | 内燃エンジンの排気還流制御系の異常検出方法 |
US5257534A (en) * | 1991-03-13 | 1993-11-02 | Mitsubishi Denki K.K. | Fault diagnosis device for an exhaust gas recycle control unit |
US5309887A (en) * | 1992-08-07 | 1994-05-10 | Mitsubishi Denki Kabushiki Kaisha | Method of detecting abnormality in exhaust gas recirculation control system of internal combustion engine and apparatus for carrying out the same |
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JPH0323354A (ja) * | 1989-06-19 | 1991-01-31 | Japan Electron Control Syst Co Ltd | 内燃機関における排気還流装置の排気還流検出装置 |
JPH04101060A (ja) * | 1990-08-16 | 1992-04-02 | Nissan Motor Co Ltd | 直噴式ディーゼルエンジン |
JP2564718B2 (ja) * | 1991-09-18 | 1996-12-18 | 三菱電機株式会社 | 排気ガス還流制御装置の故障診断装置 |
JPH06229323A (ja) * | 1993-01-30 | 1994-08-16 | Suzuki Motor Corp | 排気ガス再循環装置の自己診断装置 |
JPH0835449A (ja) * | 1994-07-25 | 1996-02-06 | Mitsubishi Electric Corp | 排気ガス還流制御装置の故障検出装置 |
-
2001
- 2001-07-24 JP JP2001223523A patent/JP4415515B2/ja not_active Expired - Fee Related
- 2001-12-21 PL PL357588A patent/PL202681B1/pl unknown
- 2001-12-21 EP EP01272278A patent/EP1347166B8/en not_active Expired - Lifetime
- 2001-12-21 HU HU0300031A patent/HU228549B1/hu not_active IP Right Cessation
- 2001-12-21 ES ES01272278T patent/ES2397224T3/es not_active Expired - Lifetime
- 2001-12-21 WO PCT/JP2001/011234 patent/WO2002052143A1/ja active IP Right Grant
- 2001-12-21 CZ CZ20023175A patent/CZ299066B6/cs not_active IP Right Cessation
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US5257534A (en) * | 1991-03-13 | 1993-11-02 | Mitsubishi Denki K.K. | Fault diagnosis device for an exhaust gas recycle control unit |
US5309887A (en) * | 1992-08-07 | 1994-05-10 | Mitsubishi Denki Kabushiki Kaisha | Method of detecting abnormality in exhaust gas recirculation control system of internal combustion engine and apparatus for carrying out the same |
JP2001107811A (ja) * | 1999-10-12 | 2001-04-17 | Toyota Motor Corp | 排気再循環装置の異常検出装置 |
JP2001159375A (ja) * | 1999-12-02 | 2001-06-12 | Nissan Motor Co Ltd | Egr装置の診断装置 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220298993A1 (en) * | 2021-03-16 | 2022-09-22 | Toyota Jidosha Kabushiki Kaisha | Egr valve deterioration degree calculation system, control device for internal combustion engine, and vehicle |
US11473537B2 (en) * | 2021-03-16 | 2022-10-18 | Toyota Jidosha Kabushiki Kaisha | EGR valve deterioration degree calculation system, control device for internal combustion engine, and vehicle |
Also Published As
Publication number | Publication date |
---|---|
CZ20023175A3 (en) | 2004-03-17 |
EP1347166B8 (en) | 2013-03-27 |
HUP0300031A2 (en) | 2003-04-28 |
PL357588A1 (en) | 2004-07-26 |
EP1347166A1 (en) | 2003-09-24 |
JP2002256982A (ja) | 2002-09-11 |
ES2397224T3 (es) | 2013-03-05 |
EP1347166B1 (en) | 2012-10-17 |
JP4415515B2 (ja) | 2010-02-17 |
EP1347166A4 (en) | 2011-06-22 |
PL202681B1 (pl) | 2009-07-31 |
CZ299066B6 (cs) | 2008-04-16 |
HU228549B1 (hu) | 2013-03-28 |
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