Nissan Motor Company Limited

Tomoya Mori

Masashi Ono

Masayuki Tomita

Toshio Takahata

Tomohiko Takahashi

Masaki Koga

Ritsuo Satou

Yuuichi Iriya

Yayoi Okumura

Junso Ichiba

Hirokimi Koyama

Eri Imai

Shinichi Kobayashi

Keisuke Hamano

Toshiya Kouno

An internal combustion engineat a standstill of a vehicle after cold starting can switch its combustion mode to a homogenous combustion mode or a stratified combustion mode. An operation range of the stratified combustion at the standstill of the vehicle after cold starting is expanded relative to an operation range of the homogenous combustion at the standstill of the vehicle after cold starting as an inclination of the vehicle decreases. With this technique, the operation range of the stratified combustion can be expanded while assuring an intake air negative pressure required for achieving the brake performance, so that HC reduction at the standstill of the vehicle after cold starting is obtained.

Control device for vehicle

An engine idle speed control device set a target idle speed NsetN for a non-traveling range is set to a high value to activate the catalytic converter early, after the engine is started. Upon detecting that the automatic transmission has been shifted from a non-traveling range to a traveling range, the target idle speed is lowered to a first traveling idle speed Nsetfor a prescribed period (200 ms). After the prescribed period elapses, the target idle speed is lowered even further to a second traveling target idle speed Nset. When the target idle speed is set to the first traveling target idle speed Nset, the ignition timing retardation amount RET is set in accordance with the actual engine rotational speed Ne in such a fashion that the higher the engine rotational speed Ne is, the more the ignition timing ADV is retarded.

Engine idle speed control device

Growing community of inventors

Zama, Japan

Tomoya Mori