Fuel pump driving apparatus for vehicle
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 24, 1990
Grant Date -
N/A
app pub date -
Jun 2, 1989
filing date -
Jul 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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