| 摘要 |
A combustion state of each cylinder is determined during a compression stroke injection mode (stratified combustion mode) or an intake-compression stroke divided injection mode (weak stratified combustion mode). When a combustion deterioration is detected, a combustion improvement control is performed in order to improve the combustion state. During the combustion improvement control, the fuel injection which is supposed to be performed in one compression stroke is divided into a plurality of injections. Alternatively, a total spark period is prolonged in a retard direction, a fuel injection timing is corrected to be advanced, or a fuel pressure is reduced.
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