| 摘要 |
PURPOSE:To increase torque output by performing feedback control of ignition timing by detection and discrimination of knocking when an engine is not in a specific running condition and by performing ignition timing control set in accordance with the engine condition when it is in a specific running condition. CONSTITUTION:When an engine is running, it is judged first whether the engine is in a specific running condition (at the time of low rotation when the engine temperature is low as under the predetermined value or the number of engine rotation is less than the predetermined value) or not in an ignition angle setting circuit 11, and if the engine is in the specific running condition, the ignition timing is set to a lead angle value determined by the number of engine rotation and air in-take negative pressure. While when it is not in the specific running condition and knocking signal is given from a knocking discriminating circuit 9, a lead angle value is obtained by subtracting a step lead angle value from the present lead angle value theta. When the lead angle value is over the maximum lead angle value thetamax which is set previously, it is se to the lead angle value thetamax. When it is below the set lead angle value thetap which is set in accordance with the running condition, it is set to the lead angle value thetap. |
