简易水温控制系统设计 毕业设计_精品.doc

毕业设计（论文） 题 目：简易水温控制系统设计 英文题：Simple temperature control system design 摘 要 水温控制在工业及日常生活中应用广泛,分类较多,不同水温控制系统的控制方法也不尽相同, 在一些温控系统电路中，广泛采用的是通过热电偶、热电阻或PN结测温电路经过相应的信号调理电路，转换成A／D转换器能接收的模拟量，再经过采样／保持电路进行A／D转换，最终送入单片机及其相应的外围电路，完成监控。但是由于传统的信号调理电路实现复杂、易受干扰、不易控制且精度不高。本文介绍单片机结合DS18B20水温控制系统设计，因此，本系统用一种新型的可编程温度传感器（DS18B20），不需复杂的信号调理电路和A／D转换电路能直接与单片机完成数据采集和处理，实现方便、精度高，可根据不同需要用于各种场合。DS18B20Abstract Water temperature control in industrial applications in daily life and extensive, classified more, the water temperature control system of different control methods vary, with control of the most common. SCM AT89C51 control of the microcontroller used as the core, the use of software programming, using algorithm to control the PWM wave generated, thereby control the electric furnace heated to a temperature control. However, a simple algorithm can not adapt to different temperature environment, a particular occasion in very good operating performance of the temperature controller, to a new environment are often not very well qualified, or even allowing the system to become unstable and need to re-adjust to change parameters To achieve better performance. This paper first algorithm used to control the PWM wave generated, thereby control the electric furnace heated to a temperature control. Then in the model reference MRAC adaptive algorithm based on the use of the MCU adaptive control, make up the traditional control structure in specific situations, the lack of decline, design a set of practical temperature monitoring system to make it in different Time constant can be achieved under the technical indicators. It is also effective in reducing the output relay switching times, often applied to environmental parameters of small changes in water temperature control system Keywords: Temperature control,；microcontroller；DS18B20 目 录 绪论 5 1.1 课题的来源及研究意义 5 1.2 课题目的 6 1.3 本次设计任务和工作要求 6 1.4 系统功能 6 1.5 系统设备 7 2 水温控制系统方案概述 8 2.1 总体方案设计及论证 8 2.2 各部分电路方案论证 8 2.2.1 温度采样部分 8 2.2.2 键盘显示部分 9