Power plants – Internal combustion engine with treatment or handling of... – Having sensor or indicator of malfunction – unsafeness – or...
Reexamination Certificate
2006-06-13
2006-06-13
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, C073S023210, C073S023220
Reexamination Certificate
active
07059112
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. Degradation of the NOx sensor is determined by estimated 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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Bidner David Karl
Surnilla Gopichandra
Allenman Hall McCoy Russell & Tuttle LLP
Ford Global Technologies LLC
Lippa Allan J.
Nguyen Tu M.
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