Kokusan Denki Co., Ltd.

Hiroshi Tamai

Atsufumi Kinoshita

An ignition system for an internal combustion engine capable of carrying out operaton of an ignition position using a generating coil arranged in a magneto as a signal coil and without using an integrating circuit. For this purpose, in the ignition system, a trigger circuit for supplying a semiconductor switch with a trigger signal includes a delay rotation region setting circuit detecting that a rotational speed of an engine enters a delay rotation region to generate a delay region signal, a reference signal generating circuit for generating reference signals of different levels depending on the delay region signal, and a trigger signal generating circuit for comparing the output signal of the signal coil with the reference signal to generate a trigger signal.

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Numazu, Japan

Hiroshi Tamai