Methods and systems for diagnostics of an emission system with more than one SCR region
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United States of America Patent
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Apr 5, 2016
Grant Date -
Apr 17, 2014
app pub date -
Dec 17, 2013
filing date -
Jul 30, 2009
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Abstract
Methods and systems for controlling and/or diagnosing an emission control system of a vehicle having a first SCR region upstream of a second SCR region are provided herein. One exemplary method includes, indicating degradation based on a first SCR region performance during a first condition; and indicating degradation based on a second SCR region performance during a second condition, the first condition different than the second condition. In this way, different levels of degradation among different SCR regions may be used to indicate emissions levels have increased above a threshold value, for example.
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