| 摘要 |
PROBLEM TO BE SOLVED: To accurately determine a combustion state by a method with reduced man-hours for adaptation. SOLUTION: The combustion state determination device detects a gravity center position of total heat generation amount in a combustion zone from the start of combustion and the completion of the combustion of each cylinder, and determines the combustion state for each cylinder based on the gravity center position. Desirably, deterioration in combustion state should be determined when a frequency, where a deviation between a mean value of the positions of the gravity center detected in a past predetermined period and the gravity center position of this time is a predetermined value or more, is a determination value or more. A fuel injection amount is corrected to be increased/decreased depending on presence/absence of deterioration in combustion state for each cylinder to perform a lean limit control in which an air-fuel ratio of air-fuel mixture supplied to each cylinder to be near a lean combustion limit, in such a manner that a fuel injection amount is corrected to be increased with respect to the cylinder in which deterioration in combustion state is detected, and on the other hand, the fuel injection amount is corrected to be decreased with respect to the cylinder in which deterioration in combustion state is not detected. COPYRIGHT: (C)2007,JPO&INPIT
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