热压机控制系统的PID改进

针对现有热压机多采用伺服控制系统，虽可以满足位置控制的要求，但很难实现大范围速度调节的问题，提出了一种新的热压机电液比例控制的PID改进系统。采用先开环控制再PID调节的方法，其中开环控制满足了速度调节的要求，PID调节保证了位置控制精度。并在PID调节时结合输出补偿，消除了比例流量阀的死区影响。还采用了正交试验的方法进行系统参数整定。结果表明，改进后的系统能很好地满足现代热压工艺同时实现速度及位置控制的要求。

Improved PID Control of Hot Press Control System

To the problem that the existing hot-presses adopting servo control system cant not change velocity in large scale,although it could control position accurately,an improved PID control system based on electro-hydraulic proportion is presented.The control process included two steps:openloop control and PID adjustment.The experiments are designed in the method of orthogonal table.The results shows that the initial open-loop control can change velocity easily and PID adjustment can guarantee the position precision, so the control system can satisfy the requirements of modern hot pressing technology.