| 摘要 |
PURPOSE:To prevent drop of the ignition output at the time of high speed operation as well as heat emission at the ignition coil at the time of low speed operation by obtaining an ignition signal, which is controlled with its loop angle with respect to the number of revolutions of the engine, from the angle signal. CONSTITUTION:A ripple signal generator 10 changes the charge/discharge characteristic, on the basis of signals about rotational information given by an FV converter 13, so as to emit a ripple signal f1 having a constant amplitude regardless of the revolving speed of the engine. A comparator 12 performs level comparison between the ripple signal f1 and reference voltage f2 and emits a loop angle control signal c. This pulse width becomes wider with rising revolving speed of the engine. The loop angle control signal C1 shall undergo a logical product processing with a costant angle pulse signal a in an AND circuit 2 so as to give output to a switching circuit 3 and thus to generate the ignition voltage. Accordingly the loop angle becomes larger with rising revolving speed of the engine. |
