Nippondenso Co., Ltd.

Kenji Hashimoto

Takeshi Matsui

Noboru Yamamoto

Yasuo Ito

Masakuni Tsujimura

Kiyotaka Sasaki

Kouichi Kato

Hideji Tani

An ignition system for internal combustion engines comprises means for generating an ignition signal in synchronism with the revolution of an internal combustion engine and an ignition circuit device for interrupting a primary current of an ignition coil in accordance with the ignition signal. The ignition circuit device includes an ignition monitor signal producing circuit for producing an ignition monitor signal which circuit operates to set the ignition monitor signal at the time of starting the energization of the ignition coil and thereafter to reset the ignition monitor signal at a subsequent predetermined timing, whereby the ignition circuit device operates, in accordance with the pulse width and the set and reset conditions of the ignition monitor signal, to decide whether the operation of the ignition circuit device is normal or abnormal, to control to generate a predetermined amount of ignition energy, and to prevent erroneous generation the ignition monitor signal due to a noise or the like.

Ignition system for internal combustion engines

Growing community of inventors

Kariya, Japan

Kenji Hashimoto