摘要自动控制系统在各个领域尤其是工业领域中有着及其广泛的应用，温湿度控制是过程控制系统中最为常见的控制类型。随着可编程逻辑控制器（PLC)技术的飞速发展，通过PLC对被控对象进行控制日益成为今后自动控制领域的一个重要发展方向。可编程逻辑控制器是一种应用很广泛的自动控制装置，它将传统的继电器控制技术、计算机技术和通讯技术融为一体，具有控制能力强、操作灵活方便、可靠性高、适宜长期连续工作的特点，非常适合温湿度控制的要求。65294

本设计主要采用西门子S7-200系列PLC对汽车发动机进气空调温湿度控制系统进行检测与控制。编程时调用了编程软件STEP 7 -Micro WIN中自带的PID控制模块，使得程序更为简洁，运行速度更为理想。并利用组态软件HITECH_ADP实现控制系统的实时监控、数据的实时采样与处理。实验证明，此系统具有快、准、稳等优点，在工业温湿度控制领域能够广泛应用。

毕业论文关键词    可编程逻辑控制器；    PID算法；    S7-200；    温湿度控制；           人机界面

毕业设计说明书（论文）外文摘要

Title  System design of temperature and humidity control of automotive engine air intake 

Abstract

Automatic control system in various fields particularly in the industrial field has its wide range of applications, temperature and humidity control is the most common type of control. With the rapid development of PLC technology, through the PLC to control the controlled object has become an important development direction in the field of automatic control. Programmable Logic Controller (PLC) is a kind of automatic control equipment which is widely used in the industrial manufacture. It merges the traditional control technology, computer and communication technologies with a strong ability to control, flexible operation, high reliability and suitable for long-term characteristics of continuous work. It is very suitable for temperature control requirements.

When programming, we use the PID control arithmetic software module which is contained in the program software STEP 7 -Micro WIN so that the program looks easier and operates more quickly. The result of experiment proves that this temperature control system could run quickly, accurately and have good stability, which is the advantage of the control system. This control system has been widely used in the industrial temperature control field.

Keywords  PLC   PID algorithm  S7-200PLC   Temperature and humidity control           HMI

目    次

1  引言 1

1.1  课程背景 1

1.2 温湿度控制的意义和背景 3

1.3 温湿度控制国内外研究现状 4

1.4 PLC概述 4

1.5  项目研究内容介绍 5

2  本次实验装置组成 7

2.1 S7-200 CPU 7

2.2  模拟量模块EM235 7

2.3  上位机软件 8

2.4  S7-200 PLC通信技术 8

2.5  输入输出元器件介绍 10

3  系统硬件介绍（PLC） 12

3.1  PLC介绍 12

3.2  S7-200的硬件组成及扩展