Preventing soot underestimation in diesel particulate filters by determining the restriction sensitivity of soot
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United States of America Patent
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Sep 18, 2012
Grant Date -
Dec 16, 2010
app pub date -
Jun 10, 2009
filing date -
Jun 10, 2009
priority date (Note) -
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Abstract
A method of determining a need to perform regeneration of a diesel particulate filter in a diesel engine exhaust predicts a soot load of a diesel particulate filter with a pressure change based soot load estimate based upon a pressure change across the diesel particulate filter at a first time and a second time. A restriction sensitivity for the diesel particulate filter is calculated based upon the pressure change across the diesel particulate filter at the first time and the second time. The method transitions from the pressure change based soot load estimate to a model based soot accumulation estimate of the soot load of the diesel particulate filter upon the restriction sensitivity falling below a predetermined threshold. Regeneration of the diesel particulate filter is requested after the estimated soot level reaches a preset level based upon the soot accumulation model.
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