Method and system for initiating an engine after-run state and controlling a nitrogen oxide sensor self-diagnostic tool
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United States of America Patent
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Aug 18, 2015
Grant Date -
May 29, 2014
app pub date -
Nov 29, 2012
filing date -
Nov 29, 2012
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Abstract
A system and method for initiating an engine after-run state and controlling a nitrogen oxide sensor self-diagnostic tool are provided. The system may include an internal combustion engine, an exhaust system, a selective catalytic reduction (SCR) device and at least two NOx sensors to measure the efficiency of the SCR device and a controller or host machine. The controller, via the present method, executes a first control action to disable the self-diagnostic tool when one of an occurrence of a particulate filter regeneration event and a non-occurrence of a calibration threshold is detected. The controller executes a second control action, initiating an engine after-run state and enabling the self-diagnostic tool when one of a non-occurrence of a particulate filter regeneration event and an occurrence of the calibration threshold is detected.
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