Modeling and simulation of an electrohydraulic actuator with load sensing variable displacement pump

Abstract EN

The main part of this paper is modeling and simulation of electrohydraulic actuator with load sensing variable displacement pump and deals with the pressure control of self-supplied variable displacement axial piston pumps equipped in high power digging excavators and forestry equipment with controlled arm executed by hydraulic power pack unit.

The automated operation of these machines requires actuators with closed loop control position, speed or force control.

The scheme of this system is presented and itemized.

Models of items and solution of control circuits are also presented as well as the results of the simulation.

The performance of the control concept is verified by means of experiments.

The results show that the proposed control concept has an excellent and robust behavior.

The measurement results show a very good performance of the overall control strategy and thus prove the practical feasibility of the proposed control strategy comprising the feed forward control, the feedback control and the extended estimator.