Apparatus, method, and system for diagnosing reductant deposits in an exhaust aftertreatment system
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United States of America Patent
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Mar 6, 2018
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app pub date -
Dec 28, 2015
filing date -
Mar 1, 2013
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Abstract
An exhaust gas treatment system for an internal combustion engine may have a reductant delivery system that delivers reductant to an exhaust stream in an exhaust aftertreatment system. A temperature sensor may be positioned in or near the flow of reductant and exhaust to measure the temperature of the reductant and exhaust. A change in temperature over time, such as an increase, decrease, or change in variation amplitude, may indicate the presence of a reductant deposit in the system. Detection of the deposit may initiate a regeneration cycle in which the operating characteristics of the system change to eliminate the reductant deposit to prevent it from hindering the performance of the exhaust aftertreatment system.
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