| 摘要 |
PROBLEM TO BE SOLVED: To prevent or suppress the increase of NOx when performing the reduction of engine torque for reducing an acceleration vibration by a compensation for making an air-fuel ratio lean. SOLUTION: A drive system resonant frequency is set correspondingly to a gear position, and the set resonant frequency component is extracted from among the signal of an intake air amount detected by an air flow meter 6. The extracted resonant frequency component is converted into the reduction amount of engine torque after phase adjustment. Principally, the reduction of engine torque is performed by making the air-fuel ratio lean, but when the ratio after leaned compensation is in a prescribed range between the ratiosα1 andα2 in which an NOx amount is a predetermined value or more, the torque reduction is performed only by the delay angle of ignition timing without compensating to make the ratio lean.
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