Jidosha Kiki Co., Ltd.

Takeo Shimada

Hideo Iwabuchi

A fuel pump control circuit includes an SCR for controlling, after turning on of an ignition switch, power supply from a power source to a fuel pump circuit for driving a fuel pump (this SCR being turned on by a gate current supplied from the power source through a first conduction path), a timer circuit for shunting the gate current, which flows into the first conduction path, to a second conduction path when a predetermined time elapses after turning on of the ignition switch, and a current limiting resistor inserted in the first conduction path.

Fuel pump control circuit

The present invention comprises a fuel pump controller having a silicon controlled rectifier (SCR) for supplying a power source voltage to a fuel pump circuit for driving a fuel pump when the SCR is turned on. A timer circuit is also provided for instantly turning on the SCR for a predetermined time period when an ignition switch is initially turned on so as to provide a discharge of fuel into the carburetor before the engine is activated or rotated. In addition, a controller is provided for repeatedly turning on the SCR each time the engine is rotated such that the fuel pump will be driven by rotation of the engine until such engine rotation ceases. By operation of this assembly, fuel is supplied to the carburetor for a predetermined time period before the engine begins to rotate so as to obtain an efficient and quick engine ignition despite the possible initial lack of fuel in the carburetor. Furthermore, since the SCR is thereafter operated by the ignition pulses generated from the engine rotation, the fuel pump will automatically shut off once the engine stops.

Growing community of inventors

Saitama, Japan

Takeo Shimada