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Title:
FAILURE DETECTING DEVICE FOR EXHAUST GAS REFLUX CONTROL DEVICE
Document Type and Number:
Japanese Patent JPH0693930
Kind Code:
A
Abstract:

PURPOSE: To detect failure of an EGR control device with a high accuracy by judging failure on the basis of the difference between control amounts of intake air amount control means controlled in order to eliminate a deviation between respective intake pipe pressure after/before the EGR control valve is opened/closed.

CONSTITUTION: An EGR control valve 12 for opening/closing an EGR passage is provided, and it is interposed in an exhaust reflux (EGR) passage for communicating the exhaust pipe 17 and the intake pipe 3 of an internal combustion engine 1 with each other. Intake air amount control means 6, 10, 11, 23 for controlling the amount of intake air supplied into the intake pipe 3 are provided so that a deviation between respective intake pipe pressure before/after the EGR control valve 12 is opened/closed is eliminated. It is judged whether a difference between control amounts of the intake air amount control means 6, 10, 11, 23 before/after the EGR control valve 12 is opened/closed is within a prescribed value, and it judged on the basis of the judgement whether an EGR control system is in failure condition. It is, thus possible to detect failure of the EGR control device with high accuracy.


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Inventors:
KAKO HAJIME
Application Number:
JP1992000240588
Publication Date:
April 05, 1994
Filing Date:
September 09, 1992
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
F02M25/07; (IPC1-7): F02M25/07
Attorney, Agent or Firm:
曾我 道照 (外6名)