DISCRETE PISTON PUMP / MOTOR USING A MECHANICAL ROTARY VALVE CONTROL MECHANISM
DISCRETE PISTON PUMP / MOTOR USING A MECHANICAL ROTARY VALVE CONTROL MECHANISM
复制标题
使用机械旋转阀控制机构的离散活塞泵/电机
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
T. Chase
中科院分区：
文献类型：
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作者：
M. Rannow;Perry Y. Li;T. Chase
液压泵和马达是高功率密度和坚固性的理想选择，但它们的效率通常低于竞争对手的技术。在传统的装置中，每个活塞在其全行程期间保持高压，并通过改变行程长度来改变位移。在所有泵/马达接口上保持高压会导致泄漏和摩擦损失在排量减少时几乎保持不变，从而导致效率低下，特别是在低排量的情况下。一种不同的方法是通过去除不需要的活塞的高压来改变排量。这种离散活塞控制方法已经由许多研究人员提出，但通常是每个活塞使用两个电液阀，这会增加成本、复杂性和鲁棒性。本文介绍了一种利用液压机械阀实现离散活塞控制的方法。一个可以轴向旋转和平移的两自由度阀门控制单个活塞的启用和禁用，并调整位移。描述了创建离散活塞装置的几种策略以及控制系统的结构。给出了泵/马达样机的初步实验结果。
Hydraulic pumps and motors are desirable for high power density and ruggedness, but they typically exhibit lower efficiency than competing technologies. In conventional devices, high pressure is maintained on each piston for its full stroke, and displacement is varied by changing the stroke length. Maintaining high pressure on all pump/motor interfaces causes leakage and friction losses to remain nearly constant as displacement is reduced, resulting in low efficiency, particularly at low displacements. A different approach is to vary the displacement by removing high pressure from unneeded pistons. This discrete piston control approach has been proposed by a number of researchers, but it is typically accomplished using two electrohydraulic valves per piston, which can increase cost, complexity, and reduce robustness. In this paper a method of discrete piston control using hydromechanical valves is described. A two degree-of-freedom valve that can rotate and translate axially controls the enabling and disabling of the individual pistons and adjusts the displacement. Several strategies for creating a discrete piston device are described, along with the structure of the control system. Preliminary experimental results from a prototype pump/motor are also presented.