Malfunction determining apparatus of an exhaust gas recirculatio

Details Malfunction determining apparatus of an exhaust gas recirculatio Malfunction determining apparatus of an exhaust gas recirculatio

1997-06-10

1998-06-30

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

731173, F02M 2507

Patent

active

057718695

ABSTRACT:
A malfunction determining apparatus of an exhaust gas recirculation system performs an accurate determination of malfunctioning of an EGR valve based on an amount of change in the actual degree of opening of the EGR valve. The EGR valve is provided between an exhaust passage and an intake passage of an internal combustion engine of a vehicle. An actual valve opening degree detector detects an actual valve opening degree of the EGR valve. A target valve opening degree calculator calculates a target valve opening degree of the EGR valve. A malfunction determining part calculates an amount of change in the actual valve opening degree when an amount of change in the target valve opening degree is equal to or greater than a predetermined value so as to determine an occurrence of malfunction in the exhaust gas recirculation system based on a comparison between the amount of change in the actual valve opening degree and a second predetermined value.

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