Modeling and Theoretical Analysis of Zero-Flowrate-Switching Control Method for a Dynamic Load System to Reduce Switching Power Loss of Control Valves

Valve switching is one of the most important power losses in digital hydraulics. In this paper, a dynamic Zero-Flowrate-Switching (ZFS) control method developed for hydraulic/pneumatic systems. The proposed strategy to actively reduce flowrate passing through valve zero before off valve. To realize it, an accessory line, which RLC oscillator applied generate sinusoidal flowrate, allocated parallel main line regulation. pressure, with high frequency and small amplitude wave outputs from regular piston pump, used drive oscillator. evaluate performance strategy, mathematical models loss pressure pulses are characteristic analysis conducted. results show that energy system when applying ZFS controller reduced 16% compared normal hydraulic without controller; moreover, much more minor than those Hard-Switching system.