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:
Aug. 12, 2003
Filed:
Sep. 27, 2000
Darren Bisaro, Dearborn, MI (US);
David Lee Boggs, Bloomfield Hills, MI (US);
Mark William Peters, Wolverine Lake, MI (US);
Stephen Richard Burke, Dearborn, MI (US);
Stephen John Kotre, Ann Arbor, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
A method of controlling an engine during engine shutdown to reduce evaporative emissions is provided. The method includes a step of shutting off a fuel pump of the engine . The method also includes a step of burning off the fuel from a fuel rail in a cylinder of the engine after the fuel pump is shut off. During the burning off of the fuel, a duty cycle of each fuel injector of engine is controlled to allow the engine to operate generally cyclically about a predetermined air/fuel ratio. The predetermined air/fuel ratio is preferably stoichiometric. By burning off the fuel in the fuel rail after the fuel pump is shut off, the fuel pressure in the fuel rail is reduced. The reduced fuel pressure in the fuel rail results in reduced evaporative emissions from the engine