Internal-combustion engines – Charge forming device – With fuel pump
Patent
1989-06-02
1990-04-24
Miller, Carl Stuart
Internal-combustion engines
Charge forming device
With fuel pump
123497, 123 4131, 123509, F02M 3900
Patent
active
049191020
ABSTRACT:
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.
REFERENCES:
patent: 3935851 (1976-02-01), Wright
patent: 4019478 (1977-04-01), Hobo
patent: 4333434 (1982-06-01), Brunais
patent: 4532893 (1985-08-01), Day
patent: 4543914 (1985-10-01), Harris
patent: 4756291 (1988-07-01), Cummins
patent: 4763611 (1988-08-01), Kobayashi
patent: 4811709 (1989-03-01), Braun
Jidosha Kiki Co. Ltd.
Miller Carl Stuart
LandOfFree
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