The article presents the laboratory verification of the mathematical description of losses and energy efficiency
of the hydraulic transmission with proportionally controlled cylinder supplied by the constant capacity pump in the
system of constant pressure is presented. The axial piston pump with pivoting rotor supplied to the system consisted of
proportional directional control valve and linear motor – hydraulic cylinder at constant pressure, cooperating with an
overflow valve. The choice of the analysed system is not accidental. There is always a view in literature about the very
limited energy capabilities of a proportional control system. For this purpose, measurement methods were developed
and a test stand was adapted. It consists of two systems: tested and loading. Measurements during the tests were
recorded up to date on the computer hard disk. In order to allow for comparison of the total efficiency of the system
with the efficiency derived from the simulation, the ki coefficients determining the energy losses of the individual
components were calculated. Investigations have shown a high convergence mathematical description of energy losses
in the elements of the system efficiency and reality. This allows accurate simulation determining the energy efficiency
of the field at every point in its operation, i.e. at any speed and any load-controlled hydraulic cylinder. The speed and
load range of the hydraulic cylinder can also be accurately simulated.
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