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。
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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