Diagnostics for hydrocarbon injection for filter regeneration
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United States of America Patent
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Jun 9, 2015
Grant Date -
Sep 5, 2013
app pub date -
Oct 4, 2010
filing date -
Oct 4, 2010
priority date (Note) -
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Abstract
A method of determining a malfunction in a hydrocarbon injection system for an internal combustion engine having an exhaust system with a diesel particulate filter and a diesel oxidation catalyst, is provided. An efficiency of a diesel oxidation catalyst to convert hydrocarbons injected for regeneration of a diesel particulate filter into heat is estimated based upon an input temperature of the diesel oxidation catalyst, an output temperature of the diesel oxidation catalyst, and an output temperature of a diesel particulate filter. The estimated efficiency is compared to a predetermined stored efficiency value. An indication of a malfunction is generated when the comparison of the estimated efficiency to the predetermined stored efficiency exceeds a threshold amount.
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