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:
Apr. 03, 2018
Filed:
Nov. 15, 2012
Applicant:
Ford Global Technologies, Llc, Dearborn, MI (US);
Inventors:
Robert Roy Jentz, Westland, MI (US);
Mark W. Peters, Wolverine Lake, MI (US);
Scott A. Bohr, Plymouth, MI (US);
Russell Randall Pearce, Ann Arbor, MI (US);
Aed M. Dudar, Canton, MI (US);
Assignee:
Ford Global Technologies, LLC, Dearborn, MI (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02M 25/08 (2006.01);
U.S. Cl.
CPC ...
F02M 25/0809 (2013.01); F02M 25/0818 (2013.01); F02M 25/0827 (2013.01); F02M 25/0836 (2013.01);
Abstract
Methods and system are provided for distinguishing fuel tank vacuum generation due to canister purge valve degradation from vacuum generation due to canister vent valve degradation. A fuel tank vacuum level is monitored after sealing the fuel tank from the atmosphere following an engine pull-down. If there is an ensuing change in fuel tank vacuum, canister purge valve degradation is determined, else, canister vent valve degradation is determined.