Patent ID: 8266892
Filing Date: 2012-09-18
Classification: F01N,Y02T

Abstract:
1. A volume quantity dispensing unit, in particular as a unit for metering an aqueous solution such as a urea/water solution, which can be used in an exhaust gas aftertreatment unit, comprising: a pressure transducer comprising an electric pressure sensor, a volume quantity dispensing of the volume quantity dispensing unit following an electric signal from a controller and the volume quantity dispensing unit being adapted, at least one fine atomizing nozzle opening directly into an exhaust gas flow for apportioning only the aqueous solution directly into the exhaust gas flow of a combustion engine, a ram/piston valve unit for opening and closing the at least one fine atomizing nozzle in different blanking ratios, and at least one means for changing a pressure value, which means changes the pressure value in such a way that the pressure value, which is intended to correspond to a pressure in the volume quantity dispensing unit, is an input signal for a volume quantity to be dispensed, wherein: