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Method and apparatus to selectively reduce NO.sub.x in an exhaust gas feedstream

United States Patent

August 30, 2011
View the Complete Patent at the US Patent & Trademark Office
A method and apparatus are described to selectively reduce NO.sub.x emissions of an internal combustion engine. An exhaust aftertreatment system includes an injection device operative to dispense a hydrocarbon reductant upstream of a silver-alumina catalytic reactor device. A control system determines a NO.sub.x concentration and hydrocarbon/NOx ratio based upon selected parameters of the exhaust gas feedstream and dispenses hydrocarbon reductant during lean engine operation. Included is a method to control elements of the feedstream during lean operation. The hydrocarbon reductant may include engine fuel.
Schmieg; Steven J. (Troy, MI), Blint; Richard J. (Shelby Township, MI), Deng; Ling (Sterling Heights, MI), Viola; Michael B. (Macomb Township, MI), Lee; Jong-Hwan (Rochester Hills, MI)
GM Global Technology Operations LLC (Detroit, MI)
11/ 533,434
September 20, 2006
GOVERNMENT CONTRACT RIGHTS The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of DE-FC26-02NT41218 awarded by the U.S. Department of Energy.