Method and apparatus for diagnosing exhaust gas aftertreatment component degradation
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United States of America Patent
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Jul 10, 2012
Grant Date -
Nov 2, 2006
app pub date -
May 2, 2005
filing date -
May 2, 2005
priority date (Note) -
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Abstract
A system is provided for diagnosing operation of an exhaust gas aftertreatment component for an internal combustion engine. The system includes a NOx sensor producing a NOx signal indicative of NOx content of exhaust gas exiting the aftertreatment component, and a control circuit configured to estimate as a function of a number of engine operating conditions a NOx inlet content corresponding to a NOx content of exhaust gas produced by the engine and entering the aftertreatment component. The control circuit is configured to determine a NOx conversion efficiency of the aftertreatment component as a function of the NOx signal and of the NOx inlet content, and to determine that the aftertreatment component is degraded if the NOx conversion efficiency is below a threshold value for at least a first predefined time period.
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