Honda Giken Kogyo Kabushiki Kaisha

Kyozo Futa

Sachito Fujimoto

Akihiro Yamato

Masaki Kanehiro

Kojiro Tsutsumi

Yuzuru Koike

An ignition timing control system for an internal combustion engine is operable to detect knocking occurring in the engine, determine basic ignition timing based upon operating conditions of the engine, correct the basic ignition timing by a correction value which is determined in response to an output from a knocking sensor, and inhibit correction of the correction value toward an advanced side with respect to at least one predetermined value in a timing retarding direction which is determined based upon operating conditions of the engine, when the correction value is greater than the at least one predetermined value. The correction value is initialized to a value based upon the difference between the correction value and the at least one predetermined value when the correction value exceeds the at least one predetermine value.

Ignition timing control system for internal combustion engines

A method of controlling the operating amount of a control valve for regulating the quantity of supplementary air being supplied to an internal combustion engine, in a feedback manner responsive to the difference between a desired idling speed and an actual engine speed, while the engine is in a predetermined idling region. When the engine is in a predetermined decelerating region immediately preceding the predetermined idling region, a basic value of the operating amount of the control valve is corrected in dependence upon a detected value of the engine temperature and a detected value of the decreasing rate of the engine speed. When the engine is further decelerated into the predetermined idling region, the feedback control is started by applying the corrected basic value of the operating amount of the control valve as an initial value thereof. Preferably, when the engine is in the predetermined decelerating region, the operating amount of the control valve is set to a value equal to the initial value applicable at the start of the feedback control, and supplementary air is supplied to the engine in a quantity corresponding to the set operating amount of the control valve.

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Wako, Japan

Kyozo Futa