Exhaust-gas aftertreatment device
AssigneeHilite Germany GmbH
InventorsFriedrich Zapf, Heico Stegmann, Andreas Lannig, Klaus Lang, Christian Schmidt, Alexandre Branco
Life of this patent
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Abstract
The invention relates to an exhaust-gas aftertreatment device, comprising a control unit (4) for controlling a diaphragm pump (2) that draws a urea/water solution out of a circuit and pumps it, via a pressure filter (3), to a metering unit comprising an atomizing nozzle for atomizing the urea/water solution into an exhaust-gas stream. In advantageous developments, the metering unit comprises a metering valve, including an atomizing nozzle, a pressure and temperature sensor, a heating means and a return baffle.
Claims16
Exhaust-gas aftertreatment device, comprising:
- a diaphragm pump,
- a pressure filter disposed downstream of the diaphragm pump,
- a metering unit,
- a control unit for controlling the diaphragm pump, and
- a pump unit, which comprises the diaphragm pump, the pressure filter and the control unit,
- the diaphragm pump being adapted to draw a urea/water solution out of a circuit and pump the urea/water solution through the pressure filter to the metering unit,
- said metering unit comprising an atomizing nozzle for atomizing the urea/water solution into an exhaust-gas stream,
- wherein:
- provided between the diaphragm pump and the pressure filter there is a housing part of a pump unit housing within which channels extend for routing the urea/water solution, and
- a cooling-water channel is provided in the pump unit, the cooling-water channel being connected to a cooling-water circuit of a motor vehicle engine, such that the urea/water solution can be thawed within the pump unit.
Dependencies are inferred from the claim text.