毕业设计（论文）-基于模糊PID的恒温控制系统设计.doc

毕业设计
毕业设计题目:基于模糊PID算法的恒温控制系统设计
学生姓名:
学号:
系(院):物理与机电工程学院自动化系
专业:自动化
班级: 级
指导教师姓名及职称: 讲师
起止时间: 2010 年 10月—— 2011年5月

基于模糊PID算法的恒温控制系统设计
摘要: 在工业生产中,温度控制通常具有单向性、滞后性、大惯性和时变性的特点,所以实现温度控制的快速性和准确性,对于提高产品质量和生产效率有很重要的现实意义。本系统设计以恒温水箱为被控对象,以单片机为控制器设计一恒温控制系统,恒温范围为40℃~90℃中的某一温度值,℃以内。在控制算法上,由于传统的PID算法其参数设定后,系统的运行、控制环境的变化、执行机构的参数发生变化而导致系统的数学模型发生改变时,这些参数不能进行适应性地改变。而模糊控制其优点是不需要被控对象的数学模型,而根据人工控制规律控制决策表,然后由该表决定控制量的大小,将模糊控制和PID控制结合起来,即可得到模糊控制灵活而适应性强,又可得到PID控制精度高、静态性能好的优点。
关键词:恒温箱温度控制;PID控制;模糊控制;单片机
Based on fuzzy PID control temperature control system design
Abstract:In industrial production, temperature control usually has one-way, hysteresis, large inertia and time-varying characteristic, the realization of temperature control of the rapidity and the accuracy, to improve the quality of our products and production efficiency has very important practical significance. This system design with the thermostatic water tank as controlled object, by puter as the controller design a temperature control system, constant temperature range for 40 ℃~ 90 ℃ temperature, the temperature of a certain error within ℃. In the control algorithm, due to the traditional PID algorithm its parameters Settings, the operation of the system, control environment changes, actuator parameters change and cause mathematic model of the system change, these parameters are not fit to change. And fuzzy control its advantage is not need to be controlled object, and the mathematical model according to artificially control laws governing decision table, and then by the quantity of decision control table, fuzzy control and PID bined, you will get more flexible and adaptable fuzzy control, and can get PID control precision and static performance good points.
Key words: Constant temperature box temperature control;PID control;Fuzzy control;SCM
目录
1 绪论..........................................................................................................................................1
设计