Toyota Jidosha Kabushiki Kaisha

Hisato Hirooka

Keiso Takeda

Tomojiro Sugimoto

Yasuhiro Yamamoto

Sachio Mori

Minoru Ogawa

Yukio Koseki

Chikara Dodate

A control device for an internal combustion engine is programmed, during a catalyst warm-up control, to perform first fuel injection by an injector in an intake stroke, control an ignition device so as to generate a discharge spark in a predetermined period in an expansion stroke, and perform second fuel injection, at a timing retarded from a compression top dead center, such that its injection period overlaps with at least a part of the predetermined period and an end timing of the injection period is advanced from an end timing of the predetermined period. Further, the control device is programmed, during the catalyst warm-up control, to control an actual tumble ratio depending on a result of determination using a first index value representing a speed of initial combustion accompanying an ignition by the ignition device and a second index value representing a speed of main combustion accompanying the ignition.

Control device for internal combustion engine

Where performing a main injection, and a sub-injection that injects a minute amount of fuel in a short region of driving time, a check is conducted to determine whether or not the minute amount of fuel is injected accurately. In a specific cycle at a time of cold starting when catalyst warm-up control is performed, the main injection is omitted and a checking injection corresponding to a sub-injection is performed. Injection conditions of an in-cylinder injection valve are made uniform between the checking injection and the sub-injection. A fuel amount that is actually injected from the in-cylinder injection valve in the specific cycle is calculated based on an air-fuel ratio of exhaust gas discharged from an engine and an in-cylinder air amount, and is compared with a fuel amount that theoretically should be injected from the in-cylinder injection valve.

An injector comprises an injection nozzle,having a nozzle hole,, a valve body,for controlling a fuel flow through the nozzle hole,, and changing means,for changing a shape of fuel spray, the fuel spray being formed by the fuel which flows through the nozzle hole. The injector includes rotation preventing means for preventing the valve body,from rotating with respect to the injection nozzle,around a center axis of the valve body,. The injector includes angular displacement controlling means for controlling an angular displacement of the valve body,with respect to the injection nozzle,. A shape of a tip of the valve body,is circumferencially non-uniform.

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Toyota, Japan

Hisato Hirooka