The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 27, 2006
Filed:
Sep. 03, 2004
Kathleen H. Stroia, Dexter, MI (US);
Stephen T. Kempfer, Canton, MI (US);
Dequan Yu, Ann Arbor, MI (US);
Matti K. Vint, Canton, MI (US);
Ross D. Pursifull, Dearborn, MI (US);
Kathleen H. Stroia, Dexter, MI (US);
Stephen T. Kempfer, Canton, MI (US);
Dequan Yu, Ann Arbor, MI (US);
Matti K. Vint, Canton, MI (US);
Ross D. Pursifull, Dearborn, MI (US);
Ford Motor Company, Dearborn, MI (US);
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.