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Method to monitor HC-SCR catalyst NOx reduction performance for lean exhaust applications

United States Patent

May 29, 2012
View the Complete Patent at the US Patent & Trademark Office
A method for initiating a regeneration mode in selective catalytic reduction device utilizing hydrocarbons as a reductant includes monitoring a temperature within the aftertreatment system, monitoring a fuel dosing rate to the selective catalytic reduction device, monitoring an initial conversion efficiency, selecting a determined equation to estimate changes in a conversion efficiency of the selective catalytic reduction device based upon the monitored temperature and the monitored fuel dosing rate, estimating changes in the conversion efficiency based upon the determined equation and the initial conversion efficiency, and initiating a regeneration mode for the selective catalytic reduction device based upon the estimated changes in conversion efficiency.
Viola; Michael B. (Macomb Township, MI), Schmieg; Steven J. (Troy, MI), Sloane; Thompson M. (Oxford, MI), Hilden; David L. (Shelby Township, MI), Mulawa; Patricia A. (Clinton Township, MI), Lee; Jong H. (Rochester Hills, MI), Cheng; Shi-Wai S. (Troy, MI)
GM Global Technology Operations LLC (Detroit, MI)
12/ 480,932
June 9, 2009
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 Cooperative Agreement Number DE-FC26-02NT41218 awarded by the U.S. Department of Energy.