Nippondenso Co., Ltd.

Toshihiro Saga

Kanechiyo Terada

Takamichi Nakase

Tiaki Mizuno

Toshitaka Yamada

Masahiro Koizumi

Hisakazu Koketsu

In the ignition apparatus for internal combustion engines, the internal combustion engine drives a generator and the generator charges a battery. The battery is connected to a boosting transformer which is connected with a semiconductor switch. The semiconductor switch causes a current to intermittently flow in the primary coil of the boosting transformer from the battery. An intermittence control circuit is connected between the semiconductor switch and the generator and controls the semiconductor switch to turn on and off a plurality of times per revolution of the generator in synchronism with the output of the generator. Thus, the semiconductor switch allows the transformer to generate a high voltage for ignition across the secondary coil. The intermittence control circuit includes an over-rotation preventing capacitor.

Ignition apparatus for internal combustion engines

An ignition timing adjusting system for an internal combustion engine wherein the output of a magneto-type generator driven by the engine is used as a power source to generate a constant voltage output through a voltage regulator circuit, and a rotational angular position of the engine is detected by a sensor and the corresponding output signal being used as a reference signal in order to electronically determine an ignition timing by an advance angle computing circuit energized by the constant voltage output of the voltage regulator circuit, and further detecting the constant voltage output of the regulator circuit, and an advance angle adjusting circuit cancels the computed output from the advance angle adjusting circuit when the detected voltage is less than a voltage which is an absolute minimum voltage necessary for the accurate ignition timing operation, whereby when the detected constant voltage output is not adequately regulated the computed output of the advance angle adjusting circuit causing the excessively advanced ignition timing is ignored, instead, forcibly timing the ignition to occur at the low-speed fixed angular position.

Electronic ignition timing adjusting system for internal combustion

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Kariya, Japan

Toshihiro Saga