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:
Oct. 28, 2008
Filed:
Jan. 24, 2007
Wenbo Wang, Novi, MI (US);
Michael A. Kropinski, Troy, MI (US);
Kurt D. MC Lain, Clarkston, MI (US);
Wenbo Wang, Novi, MI (US);
Michael A. Kropinski, Troy, MI (US);
Kurt D. Mc Lain, Clarkston, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A method of monitoring air flow restriction in an air intake of an internal combustion engine includes recording a predetermined number of pre-throttle pressure samples, recording a predetermined number of mass air flow samples, which respectively correspond to the pre-throttle pressure samples and determining a slope based on the pre-throttle pressure samples and the mass air flow samples. Whether an air filter is inducing an air flow over restriction is determined based on the slope.