Pneumatic PWM position servo system is nonlinear system. The satisfied results are difficult to be obtained with traditional control method while the friction force of cylinder is large.

气动脉宽调制位置伺服系统是非线性的系统，在气缸摩擦力较大的情况下，采用传统的控制方法难以取得满意的效果。

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Because of the essence of this control system is to complete servo cylinder test, we adopted many control strategies, and the design of digital controller of computer is the main research object.

又因为是试验台控制系统，其本质是为了进行伺服缸的试验，所以我们针对该系统应用了多种控制策略，其中计算机控制系统的数字控制器设计是本文研究的重点内容。

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Double shaft servo feed system by PLC to control accurately and automatically feed of cylinder head and valve lift.

PLC控制双轴伺服进给系统，精确自动控制缸盖进给和气门升程。

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