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1. (WO2015123411) TECHNIQUES FOR CONTROL OF AN SCR AFTERTREATMENT SYSTEM

Pub. No.:    WO/2015/123411    International Application No.:    PCT/US2015/015605
Publication Date: Fri Aug 21 01:59:59 CEST 2015 International Filing Date: Fri Feb 13 00:59:59 CET 2015
IPC: F01N 11/00
Applicants: CUMMINS INC.
Inventors: HSIEH, Ming-Feng
HAAS, Michael
GARIMELLA, Phanindra, V.
Title: TECHNIQUES FOR CONTROL OF AN SCR AFTERTREATMENT SYSTEM
Abstract:
A selective catalytic reduction (SCR) catalyst is disposed in an exhaust gas system of an internal combustion engine. A reductant injector is coupled to the exhaust gas stream at a position upstream of the SCR catalyst, and first and second NOx sensors provide NOx measurements upstream of and downstream of the SCR catalyst, respectively. A system and method is disclosed for operating the system to determine a NOx amount and/or a NH3 slip amount downstream of the SCR catalyst by decoupling NOx-NH3 measurements from the output of the second NOx sensor to provide control of the reductant injection amount.