Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1994-08-23
1996-06-04
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60286, 60289, 60301, 60303, F01N 320
Patent
active
055222188
ABSTRACT:
The present invention is particularly well suited for purifying exhaust from relatively large lean burn diesel engines. A computer controlled injector intermittently injects an optimal amount of NOx reducing fluid into the exhaust passageway from the engine. The optimal amount corresponds to an amount that will achieve optimal NOx reduction rates for the given engine operating condition and exhaust temperature. A computer periodically senses the engine operating condition and the exhaust temperature, and calculates the appropriate injection amount. With appropriate deNOx and oxidation catalysts located downstream from the injector, the exhaust purification system of the present invention has the ability to greatly reduce NOx content of the exhaust while maintaining HC emissions at acceptable levels.
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Lane William H.
Learned Daniel J.
Peterson Randy N.
Smith Aaron L.
White Scott T.
Caterpillar Inc.
Hart Douglas
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