Returnless fuel injection system

Details Returnless fuel injection system Returnless fuel injection system

1996-12-16

1998-05-19

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

With fuel pump

123198D, F02M 3704, F02B 7700

Patent

active

057524904

ABSTRACT:
An improved fuel injection system for use with an internal combustion eng mounted in a vehicle. The fuel system has fuel, a fuel pump, a throttle position sensor for sensing the power requested, and an engine control unit. The improvement comprises a fuel pump control circuit using three distinct duty cycle modulator circuits to control fuel pump speed. One duty circuit is used on startup to bring the system to full operating pressure, a second duty circuit provides modulated pulses to the fuel pump to operate the fuel pump at the level set by the throttle position sensor and a third duty circuit operates the fuel pump at idle the third duty circuit maintaining the fuel flow at a level which prevents vapor lock and being also adapted to operate the fuel pump at the reduced level in the event of throttle position sensor failure.

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patent: 4284053 (1981-08-01), Merrick
patent: 4430980 (1984-02-01), Pidgeon
patent: 4577604 (1986-03-01), Hara et al.
patent: 4926829 (1990-05-01), Tuckey
patent: 5056022 (1991-10-01), Witkowski et al.
patent: 5284119 (1994-02-01), Smitley
patent: 5379741 (1995-01-01), Matysiewicz et al.
patent: 5406922 (1995-04-01), Tuckey
patent: 5605135 (1997-02-01), Netherwood

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