Self-contained electric-motor fuel pump with outlet pressure reg

Details Self-contained electric-motor fuel pump with outlet pressure reg Self-contained electric-motor fuel pump with outlet pressure reg

1993-12-30

1995-04-18

Miller, Carl S.

Internal-combustion engines

Charge forming device

With fuel pump

123 4131, F02M 3704

Patent

active

054069220

ABSTRACT:
A fuel delivery system for an internal combustion engine that includes a fuel supply, an electric-motor pump for feeding fuel under pressure from the supply to an engine, and electronic control circuitry for applying electrical power to the pump. The control circuitry includes a pressure sensitive switch coupled to the pump and responsive to pump outlet pressure for switching between conductive and non-conductive switch conditions at a preselected pump outlet pressure. A pulse width modulation amplifier is coupled to the switch for applying pulsed d.c. energy to the pump at a first average voltage level when the pressure switch is in one condition, and at a second lesser but non-zero level when the pressure switch is in the other condition. In this way, electrical power is applied to the pump motor at a reduced level when pump outlet pressure exceeds the threshold level of the pressure switch.

REFERENCES:
patent: 4728264 (1988-03-01), Tuckey
patent: 4756291 (1988-07-01), Cummins
patent: 4789308 (1988-12-01), Tuckey
patent: 4800859 (1989-01-01), Sagisaka
patent: 4919102 (1990-04-01), Iwabuchi
patent: 4920942 (1990-05-01), Fujimori
patent: 4951636 (1990-08-01), Tuckey et al.
patent: 5120201 (1992-06-01), Tuckey et al.
patent: 5133323 (1992-07-01), Treusch
patent: 5148792 (1992-09-01), Tuckey

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