EXHAUST AFTERTREATMENT SYSTEM WITH LOW-TEMPERATURE SCR
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United States of America Patent
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Issued Date -
Nov 26, 2015
app pub date -
May 23, 2014
filing date -
May 23, 2014
priority date (Note) -
Abandoned
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Abstract
An aftertreatment system may treat exhaust gas discharged from an engine. The system may include first and second selective-catalytic-reduction (SCR) catalysts and a valve. The valve may be disposed upstream of the first SCR catalyst and at least one of an oxidation catalyst and a particulate filter. The valve is connected to first and second exhaust flow paths and is movable between a first position allowing exhaust gas to flow through the first flow path and bypass the second flow path and a second position allowing exhaust gas to flow through the second flow path and bypass the first flow path. The second SCR catalyst may be a low-temperature SCR catalyst and may be disposed in the second flow path. A control module may cause the valve to move between the first and second positions based on a temperature of the exhaust gas and/or a temperature of the engine.
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