Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2006-06-27
2006-06-27
Moulis, Thomas (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S1980DB, C123S511000
Reexamination Certificate
active
07066152
ABSTRACT:
A fuel delivery system is provided with a fuel solenoid valve to minimize fuel leakage and evaporative emissions during diurnal cycles by preventing pressure buildup as the temperature of the fuel system rises. The fuel solenoid valve is located between a pressurized side of the delivery system and a fuel tank. In one embodiment, the fuel solenoid valve is closed when the engine is running or when the engine is off and the rail is hot. When the fuel rail cools down, the solenoid valve opens to bleed a desired amount of fuel thereby creating a fuel vapor space. Thereafter, during hot soak conditions of the diurnal cycles when the fuel rail is hot again while the engine is off, the pressure will rise due to the thermal expansion of the fuel and the created fuel vapor space minimizes further rising of the fuel pressure. Further, by adjusting the solenoid valve opening time, the pressure rising limit may be set at a desired pressure to minimize injector leakage.
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Kempfer Stephen T.
Pursifull Ross D.
Stroia Kathleen H.
Vint Matti K.
Yu Dequan
Brown Gregory P.
Ford Motor Company
MacMillan, Sobansky & Todd, LLC
Moulis Thomas
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