In the previous studies, Central oscillation, asymmetry of left and right movement and insufficient precise and speed of response are the main problems of electro-hydraulic servo control unit.
在以往的研究过程中，主要发现电液伺服控制单元在零位时存在振动，左右行程不对称，精度和快速性达不到使用要求的问题。
Aiming at the problems as the nonlinear factors and the position disturbance in the electro-hydraulic servo loading system of pumping unit, the conventional control method cant attain perfect effect.
抽油机电液伺服加载系统存在非线性和位置扰动引起的准确度问题，传统的控制方法不能达到理想的效果。
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