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Method and apparatus for monitoring a hydrocarbon-selective catalytic reduction device

United States Patent

8,713,914
May 6, 2014
View the Complete Patent at the US Patent & Trademark Office
A method for monitoring a hydrocarbon-selective catalytic reactor device of an exhaust aftertreatment system of an internal combustion engine operating lean of stoichiometry includes injecting a reductant into an exhaust gas feedstream upstream of the hydrocarbon-selective catalytic reactor device at a predetermined mass flowrate of the reductant, and determining a space velocity associated with a predetermined forward portion of the hydrocarbon-selective catalytic reactor device. When the space velocity exceeds a predetermined threshold space velocity, a temperature differential across the predetermined forward portion of the hydrocarbon-selective catalytic reactor device is determined, and a threshold temperature as a function of the space velocity and the mass flowrate of the reductant is determined. If the temperature differential across the predetermined forward portion of the hydrocarbon-selective catalytic reactor device is below the threshold temperature, operation of the engine is controlled to regenerate the hydrocarbon-selective catalytic reactor device.
Schmieg; Steven J. (Troy, MI), Viola; Michael B. (Macomb Township, MI), Cheng; Shi-Wai S. (Troy, MI), Mulawa; Patricia A. (Clinton Township, WI), Hilden; David L. (Shelby Township, MI), Sloane; Thompson M. (Oxford, MI), Lee; Jong H. (Rochester Hills, MI)
GM Global Technology Operations LLC (Detroit, MI)
12/ 568,754
20110072790
September 29, 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 DE-FC26-02NT41218 awarded by the U.S. Department of Energy.