| 摘要 |
PROBLEM TO BE SOLVED: To improve exhaust emission while ensuring the starting performance of an engine. SOLUTION: When an ignition switch is turned on, the opening degree of a TCV (tumble control valve) at the time of engine start is set according to the temperature of cooling water, and a reduction ratio of a fuel injection amount and a suction air amount is more decreased as the opening degree of the TCV at the time of start becomes smaller. Then, when a starter is turned on, correction of reduction for correcting the fuel injection amount and the suction air amount at the reduction ratio in accordance with the TCV opening degree at the time of start, is commenced. Thus, the correction of reduction of both the fuel injection amount and the suction air amount appropriately prevents the engine speed at the time of start from being sharply increased by TCV closing control (improvement of combustion state), thereby preventing a rich-side deviation of an air/fuel ratio when the engine speed is increased at the time of start while ensuring the starting ability. Thereafter, the TCV opening degree is corrected in response to a result of comparison between a real engine speed and a target idling engine speed during idling before starting air/fuel ratio F/B control so as to control the air/fuel ratio. COPYRIGHT: (C)2008,JPO&INPIT
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