Volume quantity dispensing unit and method for calibrating the pressure output signal volume quantity characteristic

摘要

Volume delivery unit, as a dosing unit of an aqueous solution which is used in an exhaust gas aftertreatment unit (17), with a pressure sensor (1), the volume delivery of the volume delivery unit following an electrical signal (2) and the volume delivery unit being calibrated, characterized in that the volume delivery unit is at least has a fine atomizer nozzle (18) for metering the aqueous solution into the exhaust gas stream of an internal combustion engine, which is closed and revealed by a plunger-piston valve unit (13) in different blanking ratios, and at least one means (3) for changing a pressure value (4 ) is provided which changes the pressure value (4) such that the pressure value (4), which is to correspond to the pressure in the volume quantity delivery unit, is an input signal for a volume quantity (5) to be delivered.