Patent ID: 7967168

Claim:
A method of controlling a dosing device for a liquid or pasty medium, the method which comprises: conveying the medium by a feed device having a predetermined admission pressure and by a pressure regulating valve, downstream of the feed device in a direction of flow, to a dosing pump that is driven by a drive motor having a predetermined speed; and conveying the medium with the dosing pump to an outlet valve, and issuing the medium from the outlet valve as a temporally changeable volume flow; detecting a first pressure value of the medium upstream of the dosing pump; detecting a second pressure value of the medium downstream of the dosing pump; comparing the first pressure value and the second pressure value and altering a setting of the pressure-regulating valve so that a difference between the first pressure value and the second pressure value is driven to a predetermined value; storing, in the form of a characteristic curve, value pairs of different setpoint values of the volume flow and of respectively associated values of an adjustment signal transmitted to the pressure-regulating value at which the difference between the first pressure value and the second pressure value corresponds to the predetermined value; and altering the speed of the drive motor in dependence on a volume flow setpoint value, and altering an associated adjustment signal transmitted to the pressure regulating valve simultaneously with the volume flow setpoint value on the basis of the characteristic curve.