Pure-Hydraulic Hybrid Cylinder Drive System with Hydraulic Transformer

Abstract

In this research, a novel hybrid energy-saving system with hydraulic transformer (TRF) is proposed and its efficiency is discussed. Combining normal accumulator as an energy storage device, this system compose a pure-hydraulic hybrid system. Two types of energy-saving controls are examined in numerical simulations. It is confirmed that the proposed system achieves the energy saving performance up to about 80% compared with conventional system. This corresponds to 98% of the energy that was used for cylinder ascent. Introducing the TRF, it was confirmed that more energy can be recovered. This energy can be used when the cylinder ascents. This improves an energy saving performance due to the reduction of the supplied energy from the main pump.