| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control device for an engine improving exhaust emission control efficiency in a state where an exhaust emission control catalyst is not activated. Ž<P>SOLUTION: This device determines if estimated air-fuel ratio is changed over to a lean side from a rich side and if full explosion occurs in each cylinder. If the estimated air-fuel ratio has been changed over to the lean side from the rich side and full explosion occurs in all cylinders, a fuel injection valve is controlled and fuel injection quantity is adjusted to keep an average value of the estimated air fuel ratio at lean side of theoretical air-fuel ratio and to make the estimated air-fuel ratio richer than predetermined target A/F by prescribed time and prescribed change quantity. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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