| 摘要 |
PURPOSE:To prevent the occurence of an excessive delay angle when a knocking sensor is abnormal, by making the timing for ignition at the maximum of the delay angle value obtained during the knocking feedback operation when the knocking sensor is abnormal. CONSTITUTION:Abnormality of an output of the knocking sensor, for example, breakage of a signal line of the knocking sensor or outward leaking of the output of the knocking sensor, is detected by a step 42. When the knocking sensor is abnormal, theta'kij is read out in a step 409 from a delay angle memory map, and the thetakij is made to be an ignition time delay angle in a step 411. This thetakij is the maximum delay angle when the knocking sensor is normal and the knocking feedback of the time for ignition is performed. It is obtained in steps 407 and 408. Thus, the excessive delay angle can be prevented from occurring when the knocking sensor is abnormal. |
