The electrohydraulic servo variable speed volume pump control system (hereinafter referred to as ESPCS) is integrated with a permanent magnet synchronous motor motor), fixed-displacement pump, and hydraulic cylinder. By controlling the speed, output flow of can be controlled, displacement, force, Compared traditional electro-hydraulic valve system, ESPCS has advantages high power-to-weight rati...

In an electro-hydraulic servo system, the system flow is used as intermediate variable to control output displacement/force/speed of actuator, and it plays role a medium for energy transmission conversion. Therefore, essence state actuator. The purpose this paper study non-linear characteristics pump pave way high-performance system. Based on partition idea, divided into dead zone, load saturat...

This paper studies the high performance robust motion control of electro-hydraulic servo-systems driven by double-rod hydraulic actuators. The dynamics of hydraulic systems are highly non-linear and the system may be subjected to nonsmooth and discontinuous non-linearities due to directional change of valve opening, friction and valve overlap. Aside from the non-linear nature of hydraulic dynam...

Preliminary note The aim of the investigation was to compare and unveil efficiency of electro-hydraulic control (EHR) system to mechanical three point hitch regulation in mouldboard ploughing. Increase of working velocity and three point hitch automatic regulation activity decreased depth of ploughing at both regulation systems but electro-hydraulic system done it more accurately since deviatio...

The model-free adaptive controller (MFAC) for continuous rotary electro-hydraulic servo motor was proposed to deal with uncertainties such as friction, leakage and noise. model of system replaced by universal model, the structure control parameter were combined, MFAC designed using input output data realize low speed tracking system. It is proved simulation experiment that effectively improves ...