I. Introduction
Independently of the great development of electronics in recent times, pneumatics and hydraulics continue to hold a significant and determine place in automated systems. An even better option are the combined electro-hydraulic and electro-pneumatic control systems, which are preferred in the control of continuous production processes due to a variety of their advantages. The convenience of combining them with modern computer systems makes them a basic technical tool for automation in a number of branches of technology. The wide application of these drives is due to a number of their specific advantages, creating conditions for easy replacement of other elements in control and monitoring systems. Along with their many advantages over other types of drives (e.g. electric drives), which are the main reason for their widespread use in the field of press control, electro-hydraulic drives also have some disadvantages. These include significant non-linearity and non-stationarity of the characteristics of electromechanical and hydraulic drive units [1], [2].