After-injection combustion exhaust purification system and metho

Details After-injection combustion exhaust purification system and metho After-injection combustion exhaust purification system and metho

1997-08-14

2000-01-25

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60285, 60286, 60301, F01N 300

Patent

active

060166533

ABSTRACT:
The present invention is particularly well suited for purifying exhaust from relatively large lean burn diesel engines. The emissions purification system causes an after-injection of fuel through the engine fuel injector during the exhaust stroke of an internal combustion engine. A computer controls the injector to inject an optimal amount of NOx reducing fuel into the engine cylinder. 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 determines the exhaust temperature, and calculates the appropriate injection amount. With appropriate deNOx and oxidation catalysts located downstream from the injector, the emissions purification system of the present invention has the ability to greatly reduce NOx content of the exhaust while maintaining HC emissions at acceptable levels and greatly reducing system complexity.

REFERENCES:
patent: 5207058 (1993-05-01), Sasaki et al.
patent: 5319558 (1994-06-01), Nemoto et al.
patent: 5601792 (1997-02-01), Hug et al.

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