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. 26, 2006
Filed:
Aug. 05, 2005
Igor Anilovich, Walled Lake, MI (US);
Louis a Avallone, Linden, MI (US);
David N. Belton, Birmingham, MI (US);
Ian J. Mac Ewen, White Lake, MI (US);
Vincent A. White, Northville, MI (US);
Igor Anilovich, Walled Lake, MI (US);
Louis A Avallone, Linden, MI (US);
David N. Belton, Birmingham, MI (US);
Ian J. Mac Ewen, White Lake, MI (US);
Vincent A. White, Northville, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A method for detecting emissions from an internal combustion engine generally including determining a reference air/fuel mixture signal based on an engine speed and an airflow into the engine. The method includes determining an actual air/fuel mixture signal from an air/fuel mixture sensor and comparing the reference air/fuel mixture signal to the actual air/fuel mixture signal. The method also includes determining whether an air/fuel imbalance condition occurs based on the comparison and setting a service indicator based on the determination of whether the air/fuel imbalance condition occurred.