| 摘要 |
PURPOSE:To prevent knocking after a throttle valve is quickly opened by controlling the ignition timing at the less spark advance between the spark advance based on the basic spark advance and the idle spark advance for a predetermined time after the throttle valve is opened from an idle postition. CONSTITUTION:During the engine operation, first whether an idle switch 24 is off or not is judged by a control circuit 20; when the idle switch 24 is on, i.e., a throttle valve 10 is at the idle position, an igniter 26 is controlled at the idle spark advance as the final spark advance. Next, when the throttle valve 10 is opened from the idle position; whether the timing is N ignition, i.e., within the duration after the throttle valve 10 is opened until the intake pipe pressure is stabled or not is judged. If the judgment is Yes; the said idle spark advance is compared with the spark advance obtained by correcting the basic spark advance determined from the memory map by interpolation, and the less spark advance between them is selected to control the igniter 26. |
