Influence of working fluid viscosity on the change of the operational parameters range of hydraulic engine and on energetic efficiency of the system with proportional control
PASZOTA Z.

S u m m a r y
The influence of working fluid (a hydraulic oil) viscosity, determined by a simulation, on “ki” and “a” factors, which characterize the hydraulic system components, was presented. The “ki” loss factors, which change their values with the change of oil viscosity , influence the energetic efficiency η for the specified speed facto  and engine load factor . From the other side the “ki” factors influence the amount of the system’s operational area, determined by the range of factors  and  change, and in the result they influence a maximal value of the ηmax system efficiency, possible to be achieved. That was shown on an example of the system with a proportional control, where the throttling separator is supplied with a pump of the constant output, operating with the overflow valve.