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:
Aug. 03, 2010
Filed:
Oct. 13, 2009
Yong Xu, Ann Arbor, MI (US);
Wenbo Wang, Novi, MI (US);
Vincent A. White, Northville, MI (US);
Richard H. Clutz, Howell, MI (US);
Douglas J. Moening, Highland, MI (US);
Yong Xu, Ann Arbor, MI (US);
Wenbo Wang, Novi, MI (US);
Vincent A. White, Northville, MI (US);
Richard H. Clutz, Howell, MI (US);
Douglas J. Moening, Highland, MI (US);
Abstract
A diagnostic system for an engine includes an oxygen detection module, a timing module and a control module. The oxygen detection module receives an oxygen signal from an oxygen sensor that detects an oxygen level in an exhaust system of the engine. The oxygen signal has N rich states and M lean states, where N and M are integers greater than or equal to 1. The timing module determines a rich period that the oxygen signal is in at least one of the N rich states and determines a lean period that the oxygen signal is in at least one of the M lean states. The control module detects an asymmetrical error with the oxygen sensor based on a comparison between the rich period and the lean period.