| 摘要 |
A standard deviation and mean value of a value for the cylinder pressure integrated over a predetermined interval are computed. A value for the standard deviation divided by the mean value is then made an index value for judging a limit of output fluctuations. When the index value is less than a predetermined value corresponding to the output fluctuations, then weakening of the air-fuel ratio and retarding of the ignition timing is proceeded, while when the index value is equal to or greater than the predetermined value, it is judged that the limit of the output fluctuations has been exceeded, and the air-fuel ratio is corrected to the rich side, and the ignition timing is corrected to the advance side.
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