Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1997-06-24
1999-04-27
Denion, Thomas E.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60277, 731181, F01N 300
Patent
active
058967435
ABSTRACT:
In an internal combustion engine, a catalyst monitor includes a resistive type oxygen sensor positioned between the engine and the catalyst and a temperature sensor positioned proximate to the catalyst. The oxygen sensor measures an oxygen concentration of the engine emissions and the temperature sensor monitors a temperature of the catalyst and detects a light off time of the catalyst. The magnitude of resistance of the oxygen sensor is measured and compared to a predetermined threshold level. The catalyst light off time is compared to a predetermined time value. In addition, a lifetime temperature profile of the catalyst is generated and compared to a predetermined threshold temperature level. The results of the comparisons are used to establish whether the catalyst is operating efficiently.
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Denion Thomas E.
Heraeus Electro-Nite International N.V.
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