| 摘要 |
PURPOSE:To obtain uniform spark energy and appropriate ignition timing throughout the entire rotational speed range of an engine, by providing a device for computing the starting time of energization of an ignition coil and the ignition timing, and a device for controlling the starting and cutting off of energization. CONSTITUTION:An engine control unit ECU1 comprising a signal processing circuit 2, a microcomputer 3 and an ignition drive circuit 5 receives signals from a load sensor 6, a water temperature sensor 7 and a rotating angle sensor 8. The ECU1 at first computes ignition timing and starting time of energization, and the starting time of energization is set to a timer. Then, discrimination of engine rotational speed is carried out, and therefore, if the rotational speed exceeds a reference rotational speed, the ignition timing is set to the timer. Further upon low rotational speed operation the control in which the energization time is preferential is made while upon high rotational speed operation the control in which the ignition timing is preferential is made. Therefore, the controlled predetermined signals are transferred to an ignition coil 4 through an ignition drive circuit 5, uniform ignition energy and appropriate ignition timing may be obtained throughout the entire rotational speed range of the engine. |
