Systems and techniques for heating urea injection systems
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United States of America Patent
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Feb 24, 2015
Grant Date -
Sep 11, 2014
app pub date -
Mar 1, 2013
filing date -
Mar 1, 2013
priority date (Note) -
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Abstract
A reductant delivery system is provided for delivery of reductant to an engine exhaust aftertreatment system that is heated during cold temperature conditions. A heat exchange fluid flows through a heat exchange circuit that provides a flow path from the heat source to the doser, from the doser to the reductant storage tank, and from the reductant storage tank to the heat source. A control valve controls the flow of the heat exchange fluid in the heat exchange circuit so that at least one heat exchange cycle includes a circulation period that increases the temperature of the reductant in the doser and storage tank and a termination period where circulation is stopped until reductant temperature in the doser reaches a lower limit.
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