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Title: System and method for controlling ammonia levels in a selective catalytic reduction catalyst using a nitrogen oxide sensor

A system according to the principles of the present disclosure includes an air/fuel ratio determination module and an emission level determination module. The air/fuel ratio determination module determines an air/fuel ratio based on input from an air/fuel ratio sensor positioned downstream from a three-way catalyst that is positioned upstream from a selective catalytic reduction (SCR) catalyst. The emission level determination module selects one of a predetermined value and an input based on the air/fuel ratio. The input is received from a nitrogen oxide sensor positioned downstream from the three-way catalyst. The emission level determination module determines an ammonia level based on the one of the predetermined value and the input received from the nitrogen oxide sensor.
Issue Date:
OSTI Identifier:
1372664
Assignee:
GM Global Technology Operations LLC DOEEE
Patent Number(s):
9,714,625
Application Number:
13/192,859
Contract Number:
EE0003379
Resource Relation:
Patent File Date: 2011 Jul 28
Research Org:
GM Global Technology Operations LLC, Detroit, MI (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Works referenced in this record: