Return-flow electronic fuel pressure regulator

Details Return-flow electronic fuel pressure regulator Return-flow electronic fuel pressure regulator

2008-08-06

2010-10-12

Kwon, John T (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S456000, C123S502000, C251S318000

Reexamination Certificate

active

07810470

ABSTRACT:
A return-flow electronic fuel pressure regulator for a fuel-injected engine fuel system is plumbed to the fuel rail and return line of the fuel system. The regulator includes a fill chamber connected to the fuel rail, a return chamber connected to the return line and a return reservoir disposed between the fill chamber and return chamber. Fuel flow from the fill chamber to the return reservoir is regulated via a diaphragm valve assembly. Fuel flow from the return reservoir to the return chamber is subject to restriction by an adjustable valve. Integral comparative pressure sensing means measures the fuel pressure drop between the return reservoir and return chamber. An electronic control module, preferably programmed to maintain a constant pressure drop between the return reservoir and return chamber, receives a signal from the pressure sensing means and outputs a power supply signal to the fuel pump to control pump speed.

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