Exhaust aftertreatment system
AssigneeVolvo Truck Corporation
InventorsIrman Svraka, Åsa Högström
Life of this patent
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Abstract
An exhaust aftertreatment system for an internal combustion engine includes an outer casing having an exhaust gas inlet and an exhaust gas outlet between which a fluid flow path for exhaust gases is provided, a selective catalytic reduction unit provided in the fluid flow path for reducing nitrogen oxides, a reductant dosing device for adding reductant to the exhaust flow upstream of the selective catalytic reduction unit, and a rotatable mixer device for mixing the reductant with exhaust gases upstream of the selective catalytic reduction unit, an air inlet valve provided upstream of the mixer device for introducing air into the fluid flow path, and an electric motor arranged for rotating the mixer device to create a suction of air into the fluid flow path via the air inlet valve.
Claims16
An exhaust aftertreatment system for an internal combustion engine, the exhaust aftertreatment system comprising:
- an outer casing having an exhaust gas inlet and an exhaust gas outlet, a fluid flow path for exhaust gases from the internal combustion engine being provided between the exhaust gas inlet and the exhaust gas outlet,
- a selective catalytic reduction unit provided in the fluid flow path and being configured for reducing nitrogen oxides,
- a reductant dosing device for adding reductant to the exhaust flow upstream of the selective catalytic reduction unit, and
- a rotatable mixer device for mixing the reductant with exhaust gases upstream of the selective catalytic reduction unit,
- an air inlet valve provided upstream of the mixer device and being configured for introducing air into the fluid flow path, and
- an electric motor arranged for rotating the mixer device to create a suction of the air introduced into the fluid flow path via the air inlet valve,
- wherein
- the exhaust aftertreatment system further comprises a heating element configured to heat gaseous medium flowing in the fluid flow path.
Dependencies are inferred from the claim text.