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. 13, 2002
Filed:
Oct. 04, 2000
Peter Zagone, Huntington Woods, MI (US);
Detroit Diesel Corporation, Detroit, MI (US);
Abstract
Systems and methods for discriminating between an EGR temperature sensor fault and actual EGR temperatures which produce similar signals includes suppressing high voltage faults for a calibratible period of time after the engine is started. Alternatively, or in addition, a sensor fault is not indicated unless secondary indicators suggest that EGR temperature is sufficiently different from the EGR temperature corresponding to the sensor signal. Secondary indicators may include signals provided by various other engine and/or vehicle sensors such as an ambient air temperature sensor, engine coolant temperature sensor, oil temperature sensor, or the like.