液壓系統的性能主要取決於組成該系統的閥、泵和液壓馬達等各種流體控制元件的性能。因此提高流體控制元件的性能一直是液壓工程師的首要目標。
本文目標為研究設計並製造一利用壓電致動器取代傳統常見的比例電磁鐵、力矩馬達，當電-機換能器，直接驅動式的油壓控制閥。壓電驅動機構部分，包含了具有位移放大及導引作用之槓桿位移放大機構，實驗證實所設計之放大機構，可有效將壓電位移放大至液壓閥軸作動之行程。自行設計之五口三位閥閥體機構，也可確實達到流體換向之效果，且由油路壓力量測實驗可知，本文所設計之閥體內漏量很小，即加工精度高。之後利用本文參考文獻中所提及的自調式模糊控制器，來做閥軸的定位控制實驗，並討論其實驗結果，其控制目標下的穩態控制誤差皆在0.5μm內，可藉由控制閥軸位移，來改變流經窗孔之開口大小，以達到流量控制之效果。且經由追蹤控制實驗看出，本文壓電閥可做為高速比例閥與低流量伺服閥使用。

Performance of the hydraulic system mainly depends on various hydraulic valves, pumps and hydraulic motors and other components of the system. Therefore, to improve the performance of hydraulic control components has been the primary goal of hydraulic engineers.
The objective of this study is to design and manufacture direct drive hydraulic control valve driven by piezoelectric actuator. Replace the traditional common proportional solenoid, torque motors, to do for electricity - machine transducer. The design contains the leverage with the role of guiding the displacement amplification mechanism, experiments confirmed the amplification mechanism design can effectively enlarged the piezoelectric displacement hydraulic valve actuation shaft of the trip. And the three-position-five-way spool valve can also be really achieve the effect of changing the fluid, and can be seen from the oil pressure measurement experiments, prove that the valve design with high precision. And in the controller design, the self-tuning fuzzy controller is taken by reference to control the system be designed in the study. Discuss its results, the steady state errors are smaller than 0.5μm, by controlling the displacement of the valve shaft, to achieve the effect of flow control. And through the tracking control, this piezo valve can be used as high-speed proportional valve and low-flow servo valve.

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