Self-diagnosis apparatus for exhaust gas recirculating system

Details Self-diagnosis apparatus for exhaust gas recirculating system Self-diagnosis apparatus for exhaust gas recirculating system

1994-09-26

1996-07-30

Williams, Hezron E.

Measuring and testing

Vehicle chassis

Steering

123571, F02M 2306

Patent

active

055400914

ABSTRACT:
A self-diagnosis apparatus diagnoses an exhaust gas recirculating system of an internal combustion engine based on an amount of change in an intake pressure in a intake pipe which is caused by opening of an exhaust gas recirculation control valve which is disposed in a exhaust gas recirculating passage communicating between the intake pipe and an exhaust pipe. The apparatus determines whether or not a difference in engine speeds and/or amounts of engine control as measured before and after the exhaust gas recirculation control valve is opened exceeds a predetermined value, and executes the diagnosis when the difference in the engine speeds is not greater than a predetermined value and/or when the difference in the engine control amounts is not greater than a predetermined value.

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