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:
Feb. 28, 2012
Filed:
Jan. 19, 2009
Zhong Wang, Bellevue, WA (US);
Miles K. Maxey, Holly, MI (US);
James D. Ethington, Swartz Creek, MI (US);
Eric M. Hall, Rochester Hills, MI (US);
Brian Spohn, Holly, MI (US);
David Edward Prout, Linden, MI (US);
Zhong Wang, Bellevue, WA (US);
Miles K. Maxey, Holly, MI (US);
James D. Ethington, Swartz Creek, MI (US);
Eric M. Hall, Rochester Hills, MI (US);
Brian Spohn, Holly, MI (US);
David Edward Prout, Linden, MI (US);
Abstract
A leak diagnostic system for a vehicle comprises a tank pressure module and a leak diagnostic module. The tank pressure module selectively outputs first and second fuel tank pressures when an engine is shut down and when engine vacuum is greater than a predetermined engine vacuum, respectively. The leak diagnostic module selectively diagnoses a leak in a fuel vapor purge valve based on the second fuel tank pressure when the first fuel tank pressure is less than a first predetermined pressure.