学位论文--加热炉温度控制系统设计.docVIP

加热炉温度控制系统设计 [摘要] 加热炉冶金、化工、机械等各类工业控制中，并且在国民经济中占有举足轻重的地位Design of The Heating Furnace Temperature Control System [Abstract] The heating furnace temperature control system is widely used in metallurgy, chemical industry, machinery and other kinds of industrial control, and has play a decisive role in the national economy status, this paper introduces a kind of furnace temperature control system based on SCM. The AT89C51 microcontroller system as the core, by the temperature detection, transmission and conversion circuit, control circuit, display circuit, keyboard circuit, alarm circuit. The system through the thermocouple temperature sensor for temperature in real-time detection, transmission and conversion through the A/D is converted to a digital signal to the microcontroller, microcontroller for digital processing of temperature data and PID operations to calculate the control quantity, to change the solid state relay turn-on and turn-off time, thus changing the heating power of the temperature control. The keyboard circuit may be preset temperature; display circuit can display the current temperature, intuitive and easy to understand, let people stick out a mile; when the furnace temperature is too high or too low, will alarm. The hardware of this system is low cost, high temperature control accuracy, good reliability,anti-interference, which is suitable for the product is practical for large-scale production enterprises. [Keyword] Heating furnace； AT89C51； PID control； Temperature control  目 录 第1章 前言 1 1.1本课题的研究目的和意义 1 1.2本课题的国内外研究现状 1 1.3本课题的主要内容及要求 2 第2章 总体方案设计 3 2.1 方案论证 3 2.2 方案设计 3 第3章 系统硬件设计 5 3.1 单片机部分 5 3.1.1 AT89C51简介 5 3.1.2 晶振电路 7 3.1.3 复位电路 7 3.2 温度检测及变送电路 8 3.3 A/D模数转换电路 9 3.4 控制电路 12 3.5 键盘显示电路 14 3.5.1 键盘电路 14 3.5.2 LED显示电路 14 3.6 报警电路 16 第4章 控制算法设计 18 第5章 系统软件设计 21 5.1 系统流程图 21 5.2 程序清单 23 第6章 总结 30 致谢 31 参考文献 32  第1章 前言 1.1本课题的研究目的和意义 温度是生产过程和科学实验中非常普遍而又十分重要的物理参数。在工业生产过程中为了高效地进行生产必须对生产工艺过程中的主要参数如温度、压力、流量、速度等进行有效的控制其中温度控制在生产过程中占有相当大的比例。准确