Exhaust aftertreatment system
AssigneeVolvo Truck Corporation
InventorIrman Svraka
Life of this patent
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Abstract
An exhaust aftertreatment system for an internal combustion engine includes an outer casing defining an exhaust flow path for exhaust gases from the internal combustion engine, a selective catalytic reduction unit provided in the exhaust flow path for reducing nitrogen oxides, a urea dosing device for adding urea to the exhaust flow upstream of the selective catalytic reduction unit, and a rotatable mixer device for mixing the urea with exhaust gases upstream of the selective catalytic reduction unit. The exhaust aftertreatment system further comprises an air inlet valve provided upstream of the mixer device for introducing air into the exhaust flow path, and an electric motor arranged for rotating the mixer device to create a suction of air into the exhaust flow path via the air inlet valve.
Claims15
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 between which an exhaust flow path for exhaust gases from the internal combustion engine is provided,
- a selective catalytic reduction unit provided in the exhaust flow path for reducing nitrogen oxides,
- a urea dosing device for adding urea to the exhaust flow upstream of the selective catalytic reduction unit, and
- a rotatable mixer device for mixing the urea with exhaust gases upstream of the selective catalytic reduction unit,
- wherein
- the exhaust aftertreatment system further comprises an air inlet valve provided upstream of the mixer device for introducing air into the exhaust flow path, and an electric motor arranged for rotating the mixer device to create a suction of air into the exhaust flow path via the air inlet valve.
Dependencies are inferred from the claim text.