Reductant delivery for vehicle exhaust system includes liquid metering unit in sealed control volume of casing, mixing chamber and compressed air inlet

摘要

The atomization nozzle for the exhaust line is connected to a transfer tube. The casing (422) has an outlet, and is fluidically connected to the transfer tube opposite the nozzle. The front end of the casing forms a mixing chamber. The main body has inlets for compressed air and reductant. It includes a liquid metering unit in a sealed control volume of the casing, supplying reductant to the mixing chamber. The outlet is connected to the mixing chamber and liquid metering unit. The metering unit is heated or cooled by compressed air (426) and is connected to the reductant inlet (456) of the casing.