基于PID规律的Fuzzy逼近方法研究

经典PID算式是以一个常系数微分方程表示的，它在静态控制中具有良好的控制品质，动态控制品质欠佳．从物理学的角度分析，PID算是应是一个变系数的微分方程，其比例项(P)、积分项(I)、微分项(D)的系数是随过程变化而变化的．本文用FUZZY方法逐段逼近实现这一非线性控制过程，获得较好效果．

RESEARCH ON FUZZY APPROACHING METHOD BASED ON PID RULES

The classical algorithm of PID is usually described with a constant-coefficients derivative equation. While achieving a good control quality with static processes, it doesn't work well for dynamic controlling processes. From the perspective of physics, the algorithm of PID should be a variable-coefficients derivative equation. Kp, Ti and Td in the PID formula usually are not constants, in stead they are variables related to the processes. In this paper, we obtain desirable control effect by FUSSY method, which taking pecewise approximation method to complete the non-linearity control processes.