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1. (WO2018005474) NH3 SLIP DETECTION USING NOX SENSOR

Pub. No.:    WO/2018/005474    International Application No.:    PCT/US2017/039479
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Wed Jun 28 01:59:59 CEST 2017
IPC: F01N 11/00
B01D 53/94
F01N 3/20
Applicants: CUMMINS EMISSION SOLUTIONS INC.
Inventors: GONG, Jinqian
RAJAGOPAL, Varun R.
Title: NH3 SLIP DETECTION USING NOX SENSOR
Abstract:
System and methods for detecting NH3 slip using cross-sensitivity of an NOx sensor may include accessing a temperature value for a catalyst and determining the temperature value for the catalyst exceeds a predetermined value. If the temperature exceeds the predetermined value, a system-out NOx measurement signal from the system-out NOx sensor and an estimated system-out NOx value are used to calculate a delta value. A flag is set indicative of NH3 slip for an exhaust system responsive to an average of delta values for a predetermined period of time exceeding a predetermined value. If the temperature does not exceed the predetermined value, then an average of a plurality of system-out NOx measurement signals can be calculated and a flag is set indicative of NH3 slip responsive to the calculated average for a predetermined period of time exceeding a predetermined value.