Honda Motor Co., Ltd.

Hiroaki Tone

Hidekazu Hironobu

Ryuichi Hata

Masatoshi Nakajima

Nobuaki Ito

Daiki Yamazaki

Hirotaka Komatsu

Hiroshi Kubo

Toshifumi Hiraboshi

Seiichiro Irie

Yoshitomo Kono

Junpei Yamamoto

An internal combustion engine control apparatus including an electronic control unit having a microprocessor and a memory. The microprocessor is configured to perform switching an injection mode between a first injection mode in which the fuel is injected in a range including an intake stroke and a compression stroke of an internal combustion engine and a second injection mode in which the fuel is injected in the range so that an injection frequency in the compression stroke in the second injection mode is greater than an injection frequency in the compression stroke in the first injection mode; and determining whether the injection mode needs to be switched based on an ignition timing of the ignitor.

Control apparatus for internal combustion engine

A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine is provided. A wide-open intake air amount, which is an intake air amount corresponding to a state where the throttle valve is fully opened, is calculated according to the engine rotational speed, and a theoretical intake air amount, which is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine, is calculated according to the wide-open intake air amount and the intake pressure. An intake air amount of the engine is detected or estimated, and an amount of the evaporative fuel/air mixture supplied through the evaporative fuel passage to the intake passage is calculated. An intake gas amount is calculated by correcting the intake air amount using the evaporative fuel/air mixture amount, and an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the intake gas amount. The engine is controlled using the calculated exhaust gas recirculation ratio.

Control system for internal combustion engine

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Wako, Japan

Hiroaki Tone