Jidosha Kiki Co., Ltd.

Hideo Iwabuchi

Takeo Shimada

Mitusuke Masaka

Takatoshi Arai

Michio Idei

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.

Fuel pump controller

An electromagnetic pump includes a sleeve member, a resin coil bobbin, a ring-like printed circuit board, a ring-like holder, a plurality of studs, a pump housing, and a projecting portion. The sleeve member houses a plunger for controlling an operation of a control valve. The coil bobbin is arranged around the sleeve member, has a pair of flanges, and winds an excitation coil. The printed circuit board is stacked on the outer surface side of one flange of the coil bobbin with a predetermined interval therebetween and has a surface which faces the coil bobbin and on which various types of electronic parts are mounted. The holder is stacked on the side of the printed circuit board opposite to the coil bobbin with a predetermined interval therebetween. The studs project from the outer surface of the one flange of the coil bobbin and an inner surface of the holder and integrally form a stacked body. The pump housing houses the stacked body integrally formed by the studs and the sleeve member in as assembled state. The projecting portion projects from a predetermined position on the outer surface of the one flange of the coil bobbin to apply an urging force to the various types of electronic parts mounted on the printed circuit board.

Electromagnetic pump

A fuel pump driving apparatus for a vehicle, comprising a fuel pump, a blocking oscillator, including a transistor and a bias circuit therefor, for driving the fuel pump, and a control circuit for controlling an oscillating operation of the blocking oscillator. The control circuit drives the blocking oscillator upon reception of an ignition pulse generated from an ignition coil in accordance with rotation of an engine. The control circuit is constituted by a silicon controlled rectifier whose input side is series-connected to a bias circuit of the blocking oscillator, and circuit means, connected to the gate of the silicon controlled rectifier and including a Zener diode, for voltage-dividing the ignition pulse. The bias circuit for the transistor of the blocking oscillator is designed to set a current which is flowed therethrough when the transistor is OFF to be lower than a holding current of the silicon controlled rectifier.

Fuel pump driving apparatus for vehicle

An electromagnetic pump has a pump housing. The pump housing consists of a cup-like housing body with an outlet cylindrical portion at the center thereof and a lid member having an inlet cylindrical portion at the center thereof. The lid member is fixed to the cup-like housing body. The pump also includes a nonmagnetic sleeve member, a magnetic plunger slidably fitted in the nonmagnetic sleeve member, a return spring for biasing the plunger to a delivery side, inlet and outlet pipes, a coil bobbin arranged around the sleeve member, a transistor assembly consisting of a transistor and a heat sink, a printed circuit board, a holder mounted above the printed circuit board, a leaf spring arranged between the housing body and the holder. A plurality of studs extend on the outer side surface of the flange of the coil bobbin on which the transistor assembly is mounted and on an inner side surface of the holder. The transistor assembly, the printed circuit board and the holder are sequentially stacked through the studs with respect to the coil bobbin and are biased by the leaf spring toward the lid member.

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Saitama, Japan

Hideo Iwabuchi