Honda Giken Kogyo Kabushiki Kaisha

Isao Yahata

Yasunari Seki

Yukio Miyashita

Yuzuru Koike

Yosuke Tachibana

Yoshiaki Akimoto

Kiyoshi Tsukimura

Failure of a valve timing changeover control system of an internal combustion engine is detected by the steps of: (1) setting a predetermined state of intake air to be supplied to the engine depending on a control signal for controlling changeover of valve timing, (2) detecting a state of intake air being supplied to the engine, (3) comparing the detected state of intake air with the set predetermined state of intake air, and (4) detecting from the result of the combustion whether or not there is failure in the valve timing changeover control system.

Method of detecting failure of a valve timing changeover control system

A failsafe method in connection with valve timing-changeover control for an internal combustion engine. An abnormality in a control system of the engine is detected. A changeover-instructing signal is generated for changing the valve timing to the low speed valve timing in both of the lower and higher engine speed regions, when the abnormality is detected. When the abnormality is detected, the air-fuel ratio of an air-fuel mixture to be supplied to the engine is enriched when the engine is in a predetermined operating condition determined by the detected value of at least one engine parameter. The enriching of the air-fuel ratio of the air-fuel mixture is carried out by multiplying a basic fuel injection period by a correction coefficient or selecting a suitable basic fuel injection period map.

Failsafe method in connection with valve timing-changeover control for

A knocking control system for an internal combustion engine with inlet valves and exhaust valves having valve timing thereof controlled depending on operating conditions of the engine. It is determined whether or not knocking has occurred in the engine on the basis of a detection parameter indicative of knocking and at least one discrimination parameter. The operation of the engine is controlled by the use of at least one control parameter in response to the determination result, so as to eleminate knocking. The values of the discrimination and control parameters are selected in accordance with the actual valve timing. When abnormality in the valve timing control is detected, the valve timing is held at predetermined valve timing irrespective of engine operating conditions, and values of the at least one discriminating parameter and the at least one control parameter are selected, which correspond to the held predetermined valve timing. Alternatively, when abnormality in the valve timing control is detected, the above control of the engine operation is inhibited.

Knocking control system for internal combustion engines

An engine control apparatus wherein an engine output can be adjusted in accordance with an allowable revolution speed of the engine at each valve timing so that while the engine can operate at a revolution speed of up to the highest allowable speed range when operating at a valve timing at which the allowable revolution in speed is high, it can nevertheless operate advantageously without experiencing damage to the timing belt and valve jump even when operated at a valve timing having a lower allowable revolution speed range.

Growing community of inventors

Wako, Japan

Isao Yahata