摘要基于PAC的控制平台，利用温度传感器、数据采集卡、实验室模拟锅炉以及相应的配套设备搭建了一套锅炉温度控制系统。软件部分以图形化编程语言Labview来编译程序，主控制器采用传统的PID控制策略来实现对现场锅炉温度的调控。调试结果表明，比例系数过小会使系统响应缓慢，过大则会导致系统失稳；积分系数虽然有利于消除稳态误差，但对系统的稳定性不利；微分系数过大会使系统超调，过小又会使得调节时间变长。总而言之，只要参数合理这种常规PID控制策略在控制的稳定性、快速性以及准确性上还有着其优越的性能，且随着智能控制策略的发展，模糊控制、神经元网络控制以及专家系统等新兴的控制策略广泛的运用到工业控制领域，这种传统的PID控制策略将会得到更大的发展前景。66220

毕业论文关键词：温度控制系统  PAC  PID  Labview

毕业设计说明书（论文）外文摘要

Title  The Design and Implementation of Control System of the Temperature of Simulated Boiler Based on NI PAC                                             

Abstract

By the way of control platform based on PAC, using temperature sensors, data acquisition card, simulated boiler of laboratory and the corresponding equipment to build a set of control system of the temperature of the boiler. Compiling the software program with a graphical programming language named Labview. The main controller part adopts the traditional PID control strategy to achieve the control of boiler temperature. The results of debugging show that when the proportional coefficient is too small the response of system will slow down, too large will cause instability. Although the integral coefficient is beneficial to eliminate the steady-state error, but unfavorable to the stability of the system. Differential coefficient will make the system overshoot when it is too large, while too small will make the adjustment time become longer. To sum up, the conventional PID control strategy owns its superior performance on the stability, rapidity and accuracy of the control so long as the parameters are reasonable. Besides, with the development of intelligent control strategies, fuzzy control, neural network control and expert systems and other new control strategy have been used in the field of industrial control widely, in this way, the traditional PID control strategy will be greater prospects for development.

Keywords  Temperature Control System   PAC  PID   Labview

目   次

1 引言 1

1.1 研究背景 1

1.2 锅炉温度控制系统的发展历史及现状 2

1.3 本课题的主要工作 3

1.4 本章小结 3

2 炉温控制系统的总体设计 4

2.1 锅炉温度控制系统简介 4

2.2 系统总体方案设计 5

2.3 本章小结 5

3 硬件系统设计 6

3.1 总体设计 6

3.2 控制对象 7

3.3 硬件的选型 9

3.4 硬件系统的搭建 13

3.5 本章小结 13

4 软件系统设计 14

4.1 软件总体方案设计