Method of determining emission control system operability
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United States of America Patent
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-
Jan 31, 2006
Grant Date -
Jan 24, 2002
app pub date -
Sep 25, 2001
filing date -
Mar 17, 2000
priority date (Note) -
In Force
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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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