著者

馬 衛東 池尾 茂

出版者

The Japan Fluid Power System Society

雑誌

日本フルードパワーシステム学会論文集 (ISSN:18803121)

巻号頁・発行日

vol.35, no.1, pp.15-21, 2004-01-15

参考文献数

6

被引用文献数

1 1

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In order to reduce energy consumption, secondary control systems have been applied to many types of equipments. In lifting equipment and press machines using hydraulic cylinders, a hydraulic transformer is used, instead of a valve as a control component for motion control and for recovering potential energy of load. The transformer is a combination of a variable displacement pump/motor, which is a secondary controlled element, and a fixed displacement pump/motor. In this paper the energy-saving effect of the transformer is studied. Multiple closed loop controllers, consisting of displacement feedback of variable pump/motor, speed feedback of the cylinder and position feedback of the cylinder are used. The efficiency and energy consumption when the cylinder is driven up and down is calculated by simulation. Simulation results show that considerable energy saving is achieved by accurately choosing load ratio, circuit type and supply pressure.