Volumetric Control of Hydrostatic Drives System According to the Principle of the Forced Flow

The article presents considerations of controlling the hydraulic power source according to the principle of forced flow. In systems with forced flow, the pump generates a flow of liquid regardless of the load level. A pump with a constant geometric capacity produces an appropriate liquid stream by changing the rotational speed of its drive. The use of a pump with constant capacity in the hydraulic system, driven at variable speed employing an adjustable electric drive powered by a variable frequency drive (VFD), ensures high dynamics of fluid stream changes, good control quality of the hydrostatic drive, energy efficiency and low noise emission. The use of a dedicated measurement system in the hydrostatic power system enables the development of control methods for hydraulic drive systems that maintain constant efficiency, pressure and power output. The conducted simulation and experimental studies show the legitimacy of using new control methods in hydrostatic power supply systems.