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. 22, 2005
Filed:
Apr. 08, 2003
David A. Frank, Rochester Hills, MI (US);
Igor Anilovich, Walled Lake, MI (US);
Wenbo Wang, Novi, MI (US);
David A. Frank, Rochester Hills, MI (US);
Igor Anilovich, Walled Lake, MI (US);
Wenbo Wang, Novi, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A vehicle exhaust system includes a catalytic converter and an outlet sensor. The outlet sensor generates a sensor signal based on an oxygen level of exhaust gases exiting the catalytic converter. A controller communicates with an engine and the outlet sensor, and monitors the sensor signal during a predetermined period of engine operation. The controller commands an intrusive catalyst monitor test in a default order if the outlet sensor signal transitions through both thresholds during a predetermined period. The controller performs an intrusive outlet sensor test during cruise operation of the engine if the signal fails to transition through both thresholds during the catalyst monitor test.