Mazda Motor Corporation

Takayuki Okano

Yukio Masuda

A control system for an internal combustion engine comprises an engine speed sensor, a section for producing a feedback correction value in accordance with a difference between speed of the engine detected by the engine speed sensor and a target idling speed when the engine is in a specific idle operation, a section for producing a learning control correction value based on the feedback correction value and storing the produced learning control correction value in a memory to renew a stored learning control correction value, a section for the performing a feedback control for the speed of the engine with the feedback correction value and the learning control correction value combined with a fundamental control value to keep an actual idling speed of the engine at the target idling speed, an air-fuel ratio sensor, a section for performing a feedback control for an air-fuel ratio of a fuel mixture in accordance with an detection output of the air-fuel ratio sensor, a section for detecting malfunction of the air-fuel ratio sensor, and a section for prohibiting the production of a new learning control correction value when the malfunction of the air-fuel ratio sensor is detected.

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Hiroshima, Japan

Takayuki Okano