Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1994-05-09
1995-05-09
Yuen, Henry C.
Internal-combustion engines
Charge forming device
Fuel injection system
123460, 123463, F02M 6916
Patent
active
054130778
ABSTRACT:
A fuel pressure regulator valve for a fuel rail requires only a single conduit between the tank-mounted fuel pump and the fuel rail, thereby eliminating the need for a separate, and additional, return conduit for returning excess fuel to the tank. It does this by a spring-biased check valve in the inlet to the fuel chamber of the regulator. The check is biased to prevent flow from the pump into the fuel chamber of the regulator, but when the pressure in the rail drops below a certain level, a post on the diaphragm that separates the fuel chamber of the regulator from a control chamber of the regulator, unseats a spherical valve element in the check valve to allow pumped fuel to enter the fuel chamber of the regulator and pass into the fuel rail to the fuel injectors. When the pressure has built up beyond a certain pressure, the sphere again closes. Excess pressure is relieved by the pressure acting on the sphere causing the sphere to unseat, thereby allowing the excess fuel to pass out through the pressure regulator inlet.
REFERENCES:
patent: 4539960 (1985-09-01), Cowles
patent: 5148792 (1992-09-01), Tuckey
patent: 5237975 (1993-08-01), Betki et al.
patent: 5265644 (1993-11-01), Tuckey
patent: 5339785 (1994-08-01), Wilksch
Hornby Michael J.
Robinson Barry S.
Boller George L.
Moulis Thomas N.
Siemens Automotive L.P.
Wells Russel C.
Yuen Henry C.
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