ENGINE EXHAUST AFTERTREATMENT SYSTEM
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United States of America Patent
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Issued Date -
Aug 30, 2012
app pub date -
Feb 28, 2012
filing date -
Feb 28, 2011
priority date (Note) -
Abandoned
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Abstract
An internal combustion engine including a two-stage turbocharger configuration is described. Located between the turbines of the two-stage turbocharger may be an oxidation catalyst and a passive NOx adsorber or an oxidation catalyst and an SCR device. An exhaust path extending from an engine body of the internal combustion engine to the second turbine of the two-stage turbocharger configuration may also include one or more hydrocarbon sources or one or more ammonia sources. A bypass valve arrangement may permit decreased flow through the first stage of the two-stage turbocharger arrangement as well as one or more of the elements positioned between the turbines of the two-stage turbocharger.
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