Position control device for the operation of a hydraulic drive

摘要

In a position control device for the operation of a hydraulic drive 22 having an actuator 21 actuating the latter, having a position controller 15 to which are fed, via the associated comparator 14, a constant electric current as reference variable and the actual position of the hydraulic drive 22 as controlled variable, and having a summing circuit 19 connected in series with the position controller 15, to which circuit 19 the output signal formed in the position controller 15 is fed via the associated summing point 18, the arrangement is carried out so that the output signal coming from the position controller 15 is added with the correct sign to a signal proportional to the load from the hydraulic drive 22, so that the load-dependent error of the position control loop is zero (Figure 1). <IMAGE>