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

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

Patent · Tue Jul 25 00:00:00 EDT 2017

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.

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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

Resource Relation:: Patent File Date: 2011 Jul 28

Country of Publication:: United States

Language:: English

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