Aftertreatment system
AssigneeCummins Inc.
InventorsDylan Scott Trandal, Krishna Kamasamudram, Rayomand Dabhoiwala, Shirish S. Punde
Life of this patent
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Abstract
An aftertreatment system includes a dosing module. The aftertreatment system includes a selective catalytic reduction unit disposed fluidly downstream of the dosing module. The aftertreatment system includes a conduit fluidly connecting the dosing module to the selective catalytic reduction unit. The conduit has a coating disposed on a surface thereof. The coating is exposed to exhaust passing through the conduit and to the selective catalytic reduction unit. The coating is configured to capture and deactivate platinum passing through the conduit.
Claims23
An aftertreatment system comprising:
- a dosing module;
- a selective catalytic reduction (SCR) unit disposed fluidly downstream of the dosing module;
- and
- a conduit disposed fluidly upstream of the SCR unit and fluidly connecting the dosing module to the SCR unit, the conduit having a coating disposed on a surface thereof, the coating:
- exposed to exhaust passing through the conduit and to the SCR unit;
- and
- configured to capture and deactivate platinum passing through the conduit.
An aftertreatment system comprising:
- a diesel oxidation catalyst (DOC) containing platinum;
- a conduit disposed downstream of the DOC and fluidly coupled to the DOC, the conduit having a coating disposed on a surface thereof, the coating:
- exposed to exhaust passing through the conduit and from the DOC;
- and
- configured to capture and deactivate platinum passing through the conduit;
- and
- a dosing module mounted to the conduit, wherein the coating is disposed downstream of the dosing module.
A system comprising:
- an engine;
- and
- an aftertreatment system in exhaust receiving communication with the engine, the aftertreatment system comprising:
- a dosing module;
- a selective catalytic reduction (SCR) unit disposed fluidly downstream of the dosing module;
- and
- a conduit fluidly connecting the dosing module to the SCR unit, the conduit having a coating disposed on a surface thereof, the coating:
- exposed to the exhaust passing through the conduit and to the SCR unit;
- and
- configured to capture and deactivate platinum passing through the conduit.
A method of treating an aftertreatment system, the method comprising:
- determining, by a controller, that selective catalytic reduction (SCR) unit of the aftertreatment system is downstream of one or more platinum-containing catalysts;
- determining, by the controller, whether a diesel particular filter is between the one or more platinum-containing catalysts and the SCR unit;
- responsive to determining that the diesel particulate filter is not between the one or more platinum containing catalysts and the SCR unit, selectively applying, by the controller, an air flow treatment and a thermal treatment to the one or more platinum-containing catalysts;
- and
- responsive to determining that the diesel particulate filter is between the one or more platinum containing catalysts and the SCR unit, selectively applying, by the controller, the thermal treatment to the one or more platinum-containing catalysts.
Dependencies are inferred from the claim text.