| 摘要 |
PURPOSE:To aim at stabilization of the ignition timing against periodic rotational fluctuation of an engine, by setting an input signal to spark advance arithmetic circuit at intervals of 180 deg.. CONSTITUTION:In coupling circuits 1a-1c, signals from three pairs of signal generating devices P1/P4, P2/P5 and P3/P6 spaced with 180 deg. phase difference, are coupled with each other, and inputted into spark advance arithmetic circuits 2a-2c respectively. In distributing circuits 3a-3c, each ignition signal from each of spark advance arithmetic circuits 2a-2c is distributed to each corresponding one of ignition circuits I1-I6 formed in every cylinder. Since the signals at intervals of 180 deg. are inputted into respective spark advance arithmetic circuits 2a-2c, one period thereof becomes 180 deg. in a crank angle of an internal combustion engine. Therefore, the rate of the charging period of a condenser 7 to one period become larger subject to the same spark advance characteristics. Thus, in the case that the rotational period is fluctuated, the fluctuation of ignition timing become smaller.
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