Particulate matter filter diagnostic techniques based on exhaust gas analysis
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United States of America Patent
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Aug 22, 2017
Issued Date -
Jun 16, 2016
app pub date -
Dec 11, 2014
filing date -
Dec 11, 2014
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Abstract
A diagnostic system and method for diagnosing the performance of a particulate matter (PM) filter of an exhaust system each involve receiving, by a controller from at least one sensor, a gas component measurement of exhaust gas flowing through the exhaust system and the PM filter. The controller calculates a conversion efficiency of the gas component by the PM filter and compares the calculated conversion efficiency to a predetermined conversion efficiency threshold indicative of an expected conversion efficiency of a flow-through catalyst. The controller then determines whether the PM filter is cracked or damaged based on the comparison between the calculated conversion efficiency and the predetermined conversion efficiency threshold.
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