- Patent Title: Selective catalytic reduction steady state ammonia slip detection
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Application No.: US15645424Application Date: 2017-07-10
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Publication No.: US10378463B2Publication Date: 2019-08-13
- Inventor: David P. Quigley , Sarah Funk
- Applicant: GM Global Technology Operations LLC
- Applicant Address: US MI Detroit
- Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Current Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Current Assignee Address: US MI Detroit
- Agency: Cantor Colburn LLP
- Main IPC: F01N3/10
- IPC: F01N3/10 ; F01N3/20 ; F01N11/00 ; F01N3/035 ; F02D41/02 ; F02D41/14 ; F02D41/26

Abstract:
Technical solutions are described for an emissions control system for a motor vehicle including an internal combustion engine. The emissions control system includes a selective catalytic reduction (SCR) device, an NOx sensor, and a controller for ammonia slip detection. The ammonia slip detection includes comparing an NOx measurement from the NOx sensor with a predicted NOx value. In response to the NOx measurement exceeding the predicted NOx value by a threshold value, the threshold value being calibrated to a first predetermined value, the threshold value is calibrated to a second predetermined value, a timer is initiated to a predetermined duration, and during the predetermined duration of the timer, in response to a second NOx measurement from the NOx sensor exceeding the predicted NOx value by the threshold value set to the second predetermined value, a reductant dosing rate of the SCR device is adapted according to the second predetermined value.
Public/Granted literature
- US20190010884A1 SELECTIVE CATALYTIC REDUCTION STEADY STATE AMMONIA SLIP DETECTION Public/Granted day:2019-01-10
Information query
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