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摘要随着当今社会交通工具性能的不断提高，人们对乘车环境的要求也愈来愈高，客车内部空气品质状况被日益关注。本文研究的客车环保智能天窗空气质量检测单元以客车内有毒有害气体的监测监控为背景，控制核心是80C51作为核心处理单元的芯片AT89C52，利用空气质量传感器收集空气信息，随后经过A/D转换电路再将模拟信号转化为数字信号后即可实现对客车内甲醛、苯和氨的实时气体浓度信号的采集、信号处理、利用AT89C52分析，进行数字处理后在LCD1602屏上显示被测客车内空气中的有害气体浓度值，同时报警系统可以在参数超标时及时发出报警提醒。检测单元所占体积较小、功耗较低，具有很好的便携性和通用性，处理结果显示于LCD1602点阵屏，人机对话界面良好，适合于大中型客车，能够实时反映客车内部空气质量状况。
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关键词 AT89C52 客车空气质量 LCD显示
毕业设计说明书（论文）外文摘要
Title The Design about Air Quality of Sunroof testing unit in Buses
Abstract
With the continuous improvement of the properties in our transports of todays’ society, people are putting forward higher requirements of traveling environment ,air quality conditions of internal buses are increasingly being concerned . In order to monitor and control the bus poisonous gases as the background , using the core processing unit 80C51 chip AT89C52 as the control center.Firstly, using air quality sensors to collect information on the air, secondly performing A/D conversion circuit , then the simulated signal is converted to digital signal to realize the real-time bus signals in the formaldehyde gas concentration, benzene and ammonia acquisition, signal processing . Analysis processing by the above MCU. Digital processing of driving the crystal display within the passenger air measured the concentration of harmful gases, while the alarm system can be a timely reminder alarm when parameters exceeded. Detection unit occupied in small space, in lower power consumption, with good portability and versatility, with the results displaying on the LCD1602 dot-matrix LCD screen. Also the detection unit has a good man-machine dialogue interface, suitable for medium-sized passenger cars, buses in real time to reflect internal air quality.
Keywords AT89C52; Air Quality of the Buses; LCD Display
目 次
1 引言 1
1.1 课题背景 1
1.1.1 客车空气问题成因 1
1.1.2 课题研究目的及意义 1
1.2 客车内空气品质及认识 2
1.3 空气品质监测方法及改善方法 2
1.3.1 空气品质监测方法 2
1.3.2 改善空气品质方法及优缺点 3
1.3.3 空气品质测试指标的选定 3
1.4 国内外的研究状况 4
1.5 本文主要研究内容及总体方案设计 5
1.5.1 本文的主要研究内容 5
1.5.2 总体方案设计 5
2 客车环保智能天窗空气质量检测单元系统的硬件设计 5
2.1 单片机系统简介 5
2.1.1 客车环保智能天窗空气质量检测单元系统硬件结构及原理 7
2.1.2 AT89S52单片机简介 7
2.1.3 protel99se软件电路设计 8