Feature on hydraulic pumps of piston and vane design on which the delivery flow follows an arbitrary defined setpoint in accordance with a reference variable s by regulating out the disturbance variables related to leakage losses or rotation speed fluctuations (Figure F 28). For this purpose controllers with different reference variables are used that are also suitable for the regulation of hydraulic motors given appropriate modification (stroking of hydrostatic displacement machines).
Figure F 28: Schematic diagram of the function of a delivery flow control