Electronically variable pressure control

Details Electronically variable pressure control Electronically variable pressure control

1998-03-11

1999-10-19

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Fuel injection system

123511, F02M 5500

Patent

active

059671190

ABSTRACT:
The invention relates to a fuel pressure control system for an electromechanical fuel injection system. The fuel injection system includes a fuel rail for receiving pressurized fuel from a fuel source and operable to supply pressurized fuel to a fuel injector. The fuel rail pressure control system includes a pressure regulator having a flexible diaphragm separating a reference pressure chamber and a fuel chamber. The fuel chamber has a fuel inlet and a fuel outlet. The flexible diaphragm operates to open and close the fuel outlet to balance forces between the reference pressure chamber and the fuel chamber. The fuel chamber is in fluid communication with the fuel rail at the fuel inlet and in fluid communication with a fuel return line at the fuel outlet. The fuel rail pressure control system further includes a bypass fuel inlet line in fluid communication with the fuel rail and the reference pressure chamber, a bypass fuel outlet line in fluid communication with the reference pressure chamber and the fuel return line, a variable valve component disposed within the bypass fuel inlet line, and an orifice disposed within the bypass fuel outlet line. The variable valve component operates to vary fuel pressure in the reference pressure chamber to thereby proportionately vary pressure in the fuel chamber and the fuel rail.

REFERENCES:
patent: 3614945 (1971-10-01), Schlagmuller et al.
patent: 3827409 (1974-08-01), O'Neill
patent: 4235211 (1980-11-01), Sugaya
patent: 4300509 (1981-11-01), Schechter
patent: 4353385 (1982-10-01), Maisch et al.
patent: 5207203 (1993-05-01), Wagner et al.
patent: 5367999 (1994-11-01), King et al.
patent: 5425342 (1995-06-01), Ariga et al.

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