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SYSTEMS AND METHODS TO REDUCE REDUCTANT CONSUMPTION IN EXHAUST AFTERTREATMENT SYSTEMS

United States Patent Application

20170114690
A1
View the Complete Application at the US Patent & Trademark Office
Systems, apparatus and methods are provided for reducing reductant consumption in an exhaust aftertreatment system that includes a first SCR device and a downstream second SCR device, a first reductant injector upstream of the first SCR device, and a second reductant injector between the first and second SCR devices. NOx conversion occurs with reductant injection by the first reductant injector to the first SCR device in a first temperature range and with reductant injection by the second reductant injector to the second SCR device when the temperature of the first SCR device is above a reductant oxidation conversion threshold.
Gupta, Aniket (Wuhan, CN), Cunningham, Michael J. (Greenwood, IN)
15/ 389,625
December 23, 2016
GOVERNMENT RIGHTS [0002] The present invention was made with Government assistance from the U.S. Department of Energy (DOE) under contract No. DE-EE0004125. The U.S. Federal Government may have certain rights therein.