Degradation detection method for an engine having a NOx sensor

Details Degradation detection method for an engine having a NOx sensor Degradation detection method for an engine having a NOx sensor

2005-03-01

2005-03-01

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S274000, C060S276000, C060S285000, C204S424000

Reexamination Certificate

active

06860100

ABSTRACT:
An engine diagnostic system for use with an internal combustion engine coupled to a lean NOx trap with a NOx sensor coupled downstream of the trap is disclosed. Degradation of the NOx sensor is determined by estimating NOx exiting the trap based on engine out NOx and various other operating conditions. When the difference between the measured NOx and estimated NOx is greater than a predetermined value for a predetermined duration, degradation is indicated.

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