Nissan Motor Company Limited

Tomoki Itou

Kenji Suzuki

Takeshi Miyamoto

Toshio Hashimoto

Yukiyo Yamada

Kentaro Yamano

Akio Ashikaga

Atsushi Maekawa

Taichi Andou

A control method for an internal combustion engine including a variable compression ratio mechanism which includes: implementing a compression ratio fixing control in which a mechanical compression ratio is fixed to a predetermined low compression ratio, and controlling combustion form in a cylinder to stratified combustion, under engine idling during catalyst warming-up; controlling the combustion form in the cylinder to homogeneous combustion, under an operation state other than the engine idling during the catalyst warming-up; and implementing the compression ratio fixing control and controlling the combustion form in the cylinder to the homogeneous combustion, in response to pressing-down of an accelerator under the engine idling during the catalyst warming-up, and as long as the engine idling during the catalyst warming-up has a possibility to resume in response to release of the accelerator after the pressing-down.

Control method for internal combustion engine, and control system for internal combustion engine

When atmospheric pressure (Pa) which varies according to altitude is higher than a predetermined pressure threshold (Path) during idle operation in which catalyst warm-up request is issued, an intake pressure is controlled, through a throttle valve (), to an intake pressure at which an intake air amount required to promote the warm-up of a catalyst converter () is obtained. When the atmospheric pressure (Pa) is lower than the predetermined pressure threshold (Path), the intake pressure is controlled, through a throttle valve (), to an intake pressure (Pa&#x2212;Pb) at which a differential pressure (Pb) required by a brake booster () is obtained. Accordingly, negative pressure in the brake booster () can be secured while promoting the warm-up of the catalyst during the idle operation.

Method for controlling internal combustion engine and device for controlling same

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Kanagawa, Japan

Tomoki Itou