Nissan Motor Company Limited

Tohru Shibata

Hideaki Takahashi

Hiroyuki Itoyama

Hirotada Muraki

Hajime Yasuda

Kenichi Satou

Susumu Shimasaki

The internal combustion engine () has a throttle () for controlling an intake air amount and performs start-up through cranking. The starter switch () detects cranking initiation, and the crank angle sensor () detects the number of revolutions of the engine. The controller () drives the throttle () in a closed position along with the cranking initiation. The controller () can obtain both the intake negative pressure for promoting vaporization of fuel and the intake air amount necessary to maintain the idle rotation speed by counting the number of strokes or the number of revolutions of the internal combustion engine () from the cranking initiation and opening the throttle () from the closed position as the count number reaches a predetermined number.

Method and apparatus for controlling start-up of internal combustion engine

The internal combustion engine () has a throttle () for controlling an intake air amount and performs start-up through cranking. As the cranking is initiated, an atmospheric pressure is detected and an initial opening is set accordingly. The controller () controls the throttle () to the initial opening when the cranking is initiated, and controls the throttle to start to increase the throttle opening from the initial opening at a predetermined timing after the cranking initiation. By setting the initial opening based on one or both of the atmospheric pressure and the temperature at the time of cranking initiation, the intake negative pressure and the intake air amount are optimized.

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Isehara, Japan

Tohru Shibata