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Systems and methods to reduce reductant consumption in exhaust aftertreament systems

United States Patent

9,567,888
February 14, 2017
View the Complete Patent 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)
Cummins Inc. (Columbus, IN)
14/ 461,952
20150275730
August 18, 2014
GOVERNMENT RIGHTS 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.