INTER-CYLINDER AIR-FUEL RATIO VARIATION FAILURE DETECTION DEVICE FOR MULTI-CYLINDER INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To detect inter-cylinder air-fuel ratio variation failure by executing fuel injection amount change control for forcibly changing a fuel injection amount during an idle operation.

SOLUTION: This inter-cylinder air-fuel ratio variation failure detection device for a multi-cylinder internal combustion engine comprises: a means for executing fuel injection amount change control for forcibly changing a fuel injection amount of a predetermined target cylinder by a predetermined amount during an idle operation of the internal combustion engine 1; a means for executing intake air amount holding control for holding an intake air amount at a predetermined air amount or more when the fuel injection amount change control is executed; and a means for detecting the inter-cylinder air-fuel ratio variation failure on the basis of the output variation of the internal combustion engine when the fuel injection amount change control is executed.

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