Patent ID: 8301276

Claim:
A control device for the position control of a hydraulic cylinder unit, comprising a controller which receives, on the input side, a setpoint position of a piston of the hydraulic cylinder unit and an actual position of the piston and determines a preliminary manipulated variable for a valve control unit of the hydraulic cylinder unit on the basis of the difference between the setpoint position and the actual position, wherein a linearization unit is arranged downstream of the controller and multiplies the preliminary manipulated variable by a linearization factor and outputs the preliminary manipulated variable multiplied by the linearization factor, as the final manipulated variable to the valve control unit, so that the piston is adjusted at an adjustment speed, wherein the linearization unit determines the linearization factor dynamically as a function of the actual position of the piston, and of working pressures which prevail on both sides of the piston and on the inflow side and outflow side of the valve control unit, and wherein the linearization unit determines the linearization factor in such a way that a ratio between the adjustment speed and the difference between the setpoint position and actual position is independent of the actual position of the piston and of the working pressures.