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:
Mar. 08, 2011
Filed:
Oct. 01, 2008
Zhong Wang, Bellevue, WA (US);
Lan Wang, Troy, MI (US);
Ian J. Mac Ewen, White Lake, MI (US);
Igor Anilovich, Walled Lake, MI (US);
Steven Ward Majors, Howell, MI (US);
Cheol S. Lee, Ann Arbor, MI (US);
Zhong Wang, Bellevue, WA (US);
Lan Wang, Troy, MI (US);
Ian J. Mac Ewen, White Lake, MI (US);
Igor Anilovich, Walled Lake, MI (US);
Steven Ward Majors, Howell, MI (US);
Cheol S. Lee, Ann Arbor, MI (US);
Abstract
A control system comprising an oxygen sensor that generates an oxygen signal based on an oxygen concentration level in an exhaust gas of an engine, a filtering module that determines a filtered signal based on the oxygen signal, and an air-fuel imbalance detection module that detects an air-fuel imbalance in the engine based on the oxygen signal and the filtered signal. A method comprising generating an oxygen signal based on an oxygen concentration level in an exhaust gas of an engine, determining a filtered signal based on the oxygen signal, and detecting an air-fuel imbalance in the engine based on the oxygen signal and the filtered signal.