Method of determining emission control system operability

Details Method of determining emission control system operability Method of determining emission control system operability

2006-01-31

2006-01-31

Nguyen, Tu M. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

C060S276000, C060S285000, C204S424000

Reexamination Certificate

active

06990799

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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