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On-board ammonia generation and exhaust after treatment system using same

United States Patent

March 30, 2010
View the Complete Patent at the US Patent & Trademark Office
Often NOx selective catalysts that use ammonia to reduce NOx within exhaust to a harmless gas require on-board storage of ammonia which can be hazardous and inconvenient. In order to generate ammonia in exhaust, the present disclosure increases a NOx concentration in exhaust from at least one combustion chamber, at least in part, by injecting fuel in a predetermined increased NOx generation sequence that includes a first injection during non-auto ignition conditions and a second injection during auto ignition conditions. At least a portion of the NOx is converted to ammonia by passing at least a portion of the exhaust with the increased NOx concentration over an ammonia-producing catalyst.
Driscoll; Josh (Dunlap, IL), Robel; Wade J. (Peoria, IL), Brown; Cory A. (Pekin, IL), Urven, Jr.; Roger L. (Colona, IL)
Caterpillar Inc. (Peoria, IL)
11/ 242,172
October 3, 2005
U.S. GOVERNMENT RIGHTS This disclosure was made with government support under the terms of Contract No. DE-FC05-97OR22605 awarded by the Department of Energy. The government may have certain rights in this invention.