Electro-hydro-pneumatic systems for the position, speed or force control are to day even more employed as actuation means for robots, machine tools, aerospace and other engines both because of their high dynamics and specific transmitted power. Due especially to the low price and the last achievements of the field of modern and robust control it became possible to answer the new requirements on higher dynamics and stability and to replace even the traditional electromechanical means. Our paper presents some comparative results of simulations of a electrohydraulic axis both with P, PID and fuzzy-logic controllers as preliminary steps towards their implementation on the HYPAS-simulation software as well as for some actual applications in the field of machine tools. Simulations are achieved both with the MATLAB/SIMULINKand HYPAS-simulation program. Experimentally investigations were realised on an actual three-axis Cartesian robot.
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