Compression ignition engine system with diesel particulate filter coated with NOx reduction catalyst and stable method of operation
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United States of America Patent
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Jun 9, 2015
Grant Date -
Oct 4, 2012
app pub date -
Mar 30, 2011
filing date -
Mar 30, 2011
priority date (Note) -
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Abstract
An engine system includes an electronically controlled compression ignition engine configured to burn diesel fuel to produce an exhaust with a temperature and NOx to soot ratio. An aftertreatment system is fluidly connected to the engine and includes a diesel oxidation catalyst, a reductant supply, and a diesel particulate filter coated with a NOx reduction catalyst but not the diesel oxidation catalyst. A soot load density in the diesel particulate filter is stabilized by oxidizing soot at about a same rate as the compression ignition engine is supplying soot to the aftertreatment system without active regeneration. A NOx reduction reaction is catalyzed by the NOx reduction catalyst on the diesel particulate filter.
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