Method of pressure controlling a hydrostatic machine having an adjustable delivery volume

A method for pressure controlling a hydrostatic machine applying pressurized fluid to a hydraulic system, said machine having an adjustable delivery volume defined by a pivot angle of said machine and including an adjusting means for setting the pivot angle of said machine to determine a certain delivery volume, a continuously operable valve and a control loop having a damping factor for generating a pressure control signal by subtracting an actual pressure value from a desired pressure value, said control signal being supplied to the continuously operable valve for actuating said adjusting means, the method comprising the steps of:

• differentiating the actual pressure value to produce a pressure change value, multiplying the pressure change value by the pivot angle value to produce a product defining a correcting quantity, and subtracting the product from the desired pressure value to keep the damping factor of the control loop constant and independent of different volumes of the hydraulic system to which said machine supplies fluid.