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:
Dec. 11, 2012
Filed:
Feb. 11, 2010
Robert Jackson, Brighton, MI (US);
Kurt D. Mclain, Clarkston, MI (US);
Miles K. Maxey, Holly, MI (US);
Kenneth J. Kalvelage, Rochester Hills, MI (US);
Robert Jackson, Brighton, MI (US);
Kurt D. McLain, Clarkston, MI (US);
Miles K. Maxey, Holly, MI (US);
Kenneth J. Kalvelage, Rochester Hills, MI (US);
Abstract
A restriction diagnostic system for a vehicle comprises a pressure difference module and a diagnostic module. The pressure difference module determines a pressure difference between an ambient air pressure and a filtered air pressure measured at a location between an air filter and a valve that is selectively opened to enable ambient airflow through the air filter to a fuel vapor canister. The diagnostic module selectively diagnoses restriction of the airflow through the air filter when the pressure difference is greater than a predetermined pressure.