Patent ID: 10175659

Abstract:
A controller (15) which receives a target value (g*) related to a piston (3) of the hydraulic cylinder unit (1) and an actual value (g) related to the piston (3) of the hydraulic cylinder unit (1). On the basis of the difference (δg) of the values, the controller determines a provisional manipulated variable (u′). A linearization unit (17) downstream of the controller (15) multiplies the provisional manipulated variable (u′) by a linearization factor (F) and outputs the product to a valve control unit (7) as a final manipulated variable (u) such that the actual value (g) is brought toward the target (g*) at an adjustment speed. On the basis of working pressures (pA, pB) on both sides of the piston (3) and/or working pressures (pP, pT) on the feed side and on the outflow side of the valve control unit (7) and a target piston force (FKL) to be applied by the piston (3), the linearization unit (17) determines target values (pA*, pB*) for the working pressures (pA, pB). The linearization unit determines the linearization factor (F) dynamically as a function of an actual position(s) of the piston (3), the target values (pA*, pB*), and the working pressures (pP, pT) on the feed side and on the outflow side of the valve control unit (7).