Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
David Karl Bidner0
Gopichandra Sumilla0
Date of Patent
January 31, 2006
0Patent Application Number
099619420
Date Filed
September 25, 2001
0Patent Citations Received
Patent Primary Examiner
Patent abstract
An engine diagnostic system for use with an internal combustion engine coupled to a lean NOx trap with a sensor coupled downstream of the trap. The sensor provides two output signals, one indicative of an air-fuel ratio and the second indicative of a NOx concentration. Construction of the sensor insists that proper indication of NOx concentration is dependent upon proper operation of the first output signal. Degradation of the NOx concentration signal is determined when the first output signal has degraded.
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