| 摘要 |
PURPOSE:To obtain an effect for preventing a temporary engine output drop and a gradual output drop in quick acceleration and deceleration by correcting normal ignition timing depending upon the opening of a sub-throttle valve during the predetermined time when an engine is quickly accelerated and decelerated with a main throttle valve quickly opened and closed. CONSTITUTION:An engine has a sub-throttle valve opening and closing depending upon an intake negative pressure at the downstream side of a main throttle valve in an intake passage. In this case, an ignition timing setting means A is used for setting normal ignition timing depending upon an engine operation condition. Also, an ignition timing correction means B is used for correcting the normal ignition timing depending upon the opening of the sub-throttle valve. And when the absolute value of an opening change rate in the main throttle valve is equal to or larger than the predetermined value, with the sub-throttle valve ready to open and close after the opening and closing of the main throttle valve, an ignition timing control means C is used to operate an ignition device D depending upon corrected ignition timing, for example, during a time from the open and close operation of the main throttle valve to that of the sub- throttle valve.
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