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. 01, 2005
Filed:
Feb. 18, 2003
Wei Wang, Troy, MI (US);
Douglas M Stander, Grosse Pt. Woods, MI (US);
David J Carlson, Williamston, MI (US);
Chris J Booms, Milford, MI (US);
Thomas W Stephens, Dearborn, MI (US);
William E Leisenring, Tecumseh, MI (US);
Richard K Moote, Ann Arbor, MI (US);
Danny K Schuelke, Grass Lake, MI (US);
Mark J Poublon, Shelby Township, MI (US);
Craig a Summers, Northville, MI (US);
Jason E Wielenga, Jackson, MI (US);
Wei Wang, Troy, MI (US);
Douglas M Stander, Grosse Pt. Woods, MI (US);
David J Carlson, Williamston, MI (US);
Chris J Booms, Milford, MI (US);
Thomas W Stephens, Dearborn, MI (US);
William E Leisenring, Tecumseh, MI (US);
Richard K Moote, Ann Arbor, MI (US);
Danny K Schuelke, Grass Lake, MI (US);
Mark J Poublon, Shelby Township, MI (US);
Craig A Summers, Northville, MI (US);
Jason E Wielenga, Jackson, MI (US);
DaimlerChrysler Corporation, Auburn Hills, MI (US);
Abstract
A non-intrusive method and arrangement for detecting the aging of an oxygen sensor, without increasing tailpipe emissions, is provided. The method detects an aging oxygen sensor, located between a motor vehicle engine and a catalytic converter, by sampling a series of oxygen level signals taken over a calibratable time block only when at least one engine operating condition satisfies a predetermined criterion whereunder the method will not intrude upon the engine controller's ability to minimize undesirable exhaust emissions. After a series of signal processing, the samplings are then compared to calibratable thresholds in order to determine the aging degree of the oxygen sensor.