JPS6487865A - Failure diagnostics for exhaust gas recirculation controller - Google Patents

Failure diagnostics for exhaust gas recirculation controller

Info

Publication number
JPS6487865A
JPS6487865A JP62244731A JP24473187A JPS6487865A JP S6487865 A JPS6487865 A JP S6487865A JP 62244731 A JP62244731 A JP 62244731A JP 24473187 A JP24473187 A JP 24473187A JP S6487865 A JPS6487865 A JP S6487865A
Authority
JP
Japan
Prior art keywords
egr
exhaust gas
gas recirculation
failure
intake pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP62244731A
Other languages
Japanese (ja)
Other versions
JPH0478831B2 (en
Inventor
Yoichi Iwakura
Katsuyuki Kajitani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daihatsu Motor Co Ltd
Original Assignee
Daihatsu Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daihatsu Motor Co Ltd filed Critical Daihatsu Motor Co Ltd
Priority to JP62244731A priority Critical patent/JPS6487865A/en
Publication of JPS6487865A publication Critical patent/JPS6487865A/en
Publication of JPH0478831B2 publication Critical patent/JPH0478831B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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

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)

Abstract

PURPOSE:To easily discover any failure in an exhaust gas recirculation system by temporarily changing over a negative pressure switching valve, detecting whether or not variation in intake pressures before and after the changeover is within a specified range, and judging whether or not the exhaust gas recirculation system is in failure on the basis of the detected result. CONSTITUTION:When a throttle opening is free from large variation and an engine load is in a stable state, the start or stop of EGR (exhaust gas recirculation control) varies an intake pressure on condition that an EGR valve 9 is in a normal operation state. In order to control the operation of the EGR valve 9, a negative pressure switching valve 13 interposed in a negative pressure passage 12 is temporarily changed over during the execution of the EGR so as to stop the EGR only for a fixed period, and as well, it is detected whether or not the intake pressure before and after the changeover are within a specified range. Therefore, whether or not an EGR system normally operates can be judged on the basis of the varying value of the intake pressure. That is, when the varying value of the intake pressure is small enough to be within the specified range, some failure in the EGR system is judged.
JP62244731A 1987-09-29 1987-09-29 Failure diagnostics for exhaust gas recirculation controller Granted JPS6487865A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62244731A JPS6487865A (en) 1987-09-29 1987-09-29 Failure diagnostics for exhaust gas recirculation controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62244731A JPS6487865A (en) 1987-09-29 1987-09-29 Failure diagnostics for exhaust gas recirculation controller

Publications (2)

Publication Number Publication Date
JPS6487865A true JPS6487865A (en) 1989-03-31
JPH0478831B2 JPH0478831B2 (en) 1992-12-14

Family

ID=17123054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62244731A Granted JPS6487865A (en) 1987-09-29 1987-09-29 Failure diagnostics for exhaust gas recirculation controller

Country Status (1)

Country Link
JP (1) JPS6487865A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH031254U (en) * 1989-05-29 1991-01-09

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5442536A (en) * 1977-09-12 1979-04-04 Toyota Motor Corp Method and device for controlling injection of fuel
JPS54130729A (en) * 1978-03-22 1979-10-11 Bosch Gmbh Robert Method of and apparatus for determining controlled variable of internal combustion engine
JPS5839306A (en) * 1981-09-02 1983-03-08 Toyota Motor Corp Learning control method for electronic control engine
JPS6251746A (en) * 1985-08-31 1987-03-06 Nippon Denso Co Ltd Exhaust gas recirculation control device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5442536A (en) * 1977-09-12 1979-04-04 Toyota Motor Corp Method and device for controlling injection of fuel
JPS54130729A (en) * 1978-03-22 1979-10-11 Bosch Gmbh Robert Method of and apparatus for determining controlled variable of internal combustion engine
JPS5839306A (en) * 1981-09-02 1983-03-08 Toyota Motor Corp Learning control method for electronic control engine
JPS6251746A (en) * 1985-08-31 1987-03-06 Nippon Denso Co Ltd Exhaust gas recirculation control device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH031254U (en) * 1989-05-29 1991-01-09

Also Published As

Publication number Publication date
JPH0478831B2 (en) 1992-12-14

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