摘  要:由于常规PID控制器结构简单、鲁棒性强，在过程控制中应用广泛。然而当因工作环境而改变的时常规PID控制不能较好的得到实现有效控制。鉴于模糊控制不需要建立精确的数学模型就能得到良好的控制为解决该类问题提供了一种新的方法。

　　　本设计为水箱水位控制系统，经过建立数学模型，根据所设计而得到的模糊控制器。然后利用MATLAB软件来对水箱水位模糊控制系统进行仿真建模试验,利用Simulink工具箱对此系统进行设计与仿真，得到传统的PID控制与模糊控制的波形图，对传统的PID控制与模糊控制进行比较，最后采用基于三菱的PLC控制技术，编写了水箱水位的模糊控制程序。

关键词：PID控制；模糊控制；PLC ；MATLAB

ABSTRACT:As PID controller has a simple structure and good robustness and it is widely used in process control systems,but conventional PID can not be easily regulate itself according to the changes, the conventional PID control can not get satisfying controlling,result.Fuzzy control, which is based on knowledge and independent of accurate math model,brings a new way of resolving this problem. 

　　　And then use MATLAB software to fuzzy on the water tank water level control system simulation modeling, design and simulation based on Simulink toolbox to this system, control and fuzzy control of the waveform of the traditional PID, the traditional PID control and fuzzy control are compared,

　　　Lastly,By the Mitsubishi PLC control system.

Key words: PID control; fuzzy control; PLC; MATLAB