Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1996-08-30
1998-08-04
Wolfe, Willis R.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, 60284, 731181, F01N 320
Patent
active
057877050
ABSTRACT:
A procedure has been proposed for diagnosing operability of a catalytic treatment device for catalytically treating internal combustion engine exhaust gas, by determining whether the catalytic treatment device reaches a light-off operating condition within a short period of time following an engine coldstart operation. When catalytic converter temperature reaches a temperature level associated, for an operable catalytic converter, with light-off, the operating efficiency of the converter is sampled and, if persistently below an acceptable operating efficiency over a number of coldstart operations, a deterioration in the converter is stored and indicated.
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Bridges Michael J.
General Motors Corporation
Wolfe Willis R.
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