| 摘要 |
PURPOSE:To prevent heat generation of an ignition coil, etc. as well as to obtain a stable electric current sending time against rotation fluctuation by applying a small input signal of a close ratio to the electric current sending time of a ignition coil in the time of very low rotation when an engine is started. CONSTITUTION:An operation is performed in a logical circuit 20, because a electric current sending time operation cannot be carried out with a first counter 9 in the time of very low rotation when an engine is started. First, when CA output of the first counter 9 is L, a signal for an ignition device 17 is made AND output 16. And when CA output is H without an ignition cycle, the signal for the ignition device 17 is made output of a waveform shaping circuit 2 and the count of a second counter 10 is reset. At this point, the maximum close ratio at an electricity supply timing is output signal of FF11, the maximum close ratio is set large by means a dividing ratio for H section of the waveform shaping circuit 2, and the close ratio in the time of very low rotation is set small. Accordingly, a stable electric current sending time is obtained against rotation fluctuation, and heat generation of an ignition coil and an ignition device can also be prevented.
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