Backpressure valve and fuel system having the same

Details Backpressure valve and fuel system having the same Backpressure valve and fuel system having the same

2011-07-05

2011-07-05

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S498000

Reexamination Certificate

active

07971574

ABSTRACT:
A return fuel passage is configured to communicate an outlet of a low-pressure fuel pump with a back pressure side of a fuel injection device. The return fuel passage is configured to partially return fuel from the back pressure side to the fuel tank to control fuel pressure at the back pressure side in response to fuel injection. In a starting operation a backpressure control valve communicates the outlet of the low-pressure fuel pump with the back pressure side and blocks the fuel tank from both the outlet of the low-pressure fuel pump and the back pressure side. In a normal operation, the backpressure control valve communicates the back pressure side with the fuel tank and blocks the outlet of the low-pressure fuel pump from both the fuel tank and the back pressure side.

REFERENCES:
patent: 6899069 (2005-05-01), Mattes et al.
patent: 7520267 (2009-04-01), Toyoshima
patent: 2006/0016906 (2006-01-01), Matsumoto

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