System and method for controlling ammonia levels in a selective catalytic reduction catalyst using a nitrogen oxide sensor
Patent
·
OSTI ID:1372664
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.
- Research Organization:
- GM Global Technology Operations LLC, Detroit, MI (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- EE0003379
- Assignee:
- GM Global Technology Operations LLC
- Patent Number(s):
- 9,714,625
- Application Number:
- 13/192,859
- OSTI ID:
- 1372664
- Country of Publication:
- United States
- Language:
- English
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