文档介绍：基于单片机的温度控制系统的软件设计
摘要
随着现代信息技术的飞速发展,温度测量控制系统在工业、农业及人们的日常生活中扮演着一个越来越重要的角色,它对人们的生活具有很大的影响,所以温度控制系统的设计与研究有十分重要的意义。
本系统的设计以AT89C51单片机为基础,结合温度传感变送器、A/D转换器、LED显示器、固态继电器等,组成一个基于AT89C51单片机的温度控制系统。在此系统中,通过键盘设定给定温度值,同时送LED显示。温度传感变送器获得温度的感应电压,转变成1-5V的标准电压信号,再由A/D转换器转换成数字信号送入单片机内部,同时将采样回来的温度值送LED显示。单片机将给定的温度与测量温度的相比较后,进行史密斯预估补偿运算和PID运算后,得出控制量。执行器由开关频率较高的固态继电器开关担任,采用模拟的PWM控制方法,改变同一个周期中电子开关的闭合时间,达到控制的温度的目的,使实际的输出温度跟随设定温度。
本文详细阐述了基于单片机的温度控制系统的软件设计,简要的介绍了硬件电路及相关的接口电路的设计。并且充分考虑了系统的可靠性,采取了相应的措施予以保证。针对控制对象的特点,在MATLABE的基础上对系统的控制算法进行了仿真研究,并在单片机系统中实现了控制算法。最后用PROTEUS软件对温度控制系统进行与硬件电路的联调仿真,通过对仿真结论的分析表明本文所述的基于单片机的温度控制系统的设计的合理性和有效性。
关键词:AT89C51单片机,纯滞后,史密斯预估器
The software design of temperature control system based on SCM
ABSTRACT
Along with the present information technology's swift development, the temperature survey control system in the industry, agricultural and in people's daily life is playing a more and more important role, it has the very tremendous influence to people's life, therefore temperature control system's design and the research have the very vital significance.
This system's design take at89C51 monolithic integrated circuit as the foundation, the union temperature sensing transmitting instrument, a/D switch, the LED monitor, the solid state relay and so on, composes one based on AT89C51 monolithic integrated circuit's temperature control system. In this system, assigns the temperature value through the keyboard hypothesis, simultaneously delivers the LED demonstration. The temperature sensing transmitting instrument obtains the temperature the induced tension, transforms 1-5V the standard voltage signal, transforms the digital signal by a/D switch to send in again the monolithic integrated circuit, simultaneously the temperature value es back the sampling delivers the LED demonstration. The monolithic integrated circuit will assign after the temperature and the survey pare, carries on Smith to estimate pensation operation and PID operation, obtains the control qu