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A Study on Energy Saving Hydraulic Cylinder System Using Hydraulic Transformer  

Lee, Min-Su (울산대학교 기계자동차공학과)
Cho, Yong-Rae (울산대학교 기계자동차공학과)
Yoon, Hong-Soo (울산대학교 기계자동차공학과)
Ahn, Kyoung-Kwan (울산대학교 기계자동차공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.25, no.2, 2008 , pp. 49-56 More about this Journal
Abstract
In order to reduce energy consumption, secondary controlled system has been applied to many types of equipments. In lifting equipments or press machines using hydraulic cylinder, a hydraulic transformer is used as a control component instead of a valve for motion control and a component for recovering potential energy of load. The transformer is a combination of a variable displacement pump/motor as a secondary controlled element and a fixed displacement pump/motor. In this paper the effect of transformer is studied. Multiple closed loop controllers with displacement feedback of variable pump/motor, speed feedback and position feedback of cylinder are used. The efficiency and energy consumption when cylinder is driven up and down is calculated by simulation. Simulation results show that considerable energy saving is achieved by choosing load ratio, circuit type and supply pressure.
Keywords
Hydraulic transformer; Energy saving; Hydraulic cylinder; CPS; Simulation;
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  • Reference
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