Control apparatus for internal combustion engine

Details Control apparatus for internal combustion engine Control apparatus for internal combustion engine

1998-09-08

2000-02-22

Kwon, John

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123690, F02M 2500

Patent

active

060267941

ABSTRACT:
When fuel supply system abnormality diagnosis conditions are satisfied, the abnormality of a fuel supply system is diagnosed by comparing an air/fuel ratio deviation index value with a lean/rich abnormality determination value by diagnosis means. At this time, a hot lean abnormality determination value KHL is set leaner than an ordinary lean abnormality determination value KLL, and a hot rich abnormality determination value KHH is set richer than an ordinary rich abnormality determination value KLH by abnormality determination value setting means when the engine compartment temperature is high. As a result, it is possible to diagnose whether or not the fuel supply system is abnormal (i.e., an abnormal deviation in the air/fuel ratio) while preventing the mistake even when the engine compartment temperature is high, so that the early discovery of the abnormality and the prevention of the mistaken diagnosis are made compatible.

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