酒后驾车检测system设计.docVIP

酒后驾车检测系统设计 宋长飞 (陕理工机械工程学院热能与动力工程汽车082，陕西 汉中 723003) 指导教师：常红梅 [摘要]本文介绍了酒后驾车检测系统设计的问题，阐述了基于气敏传感器的酒精浓度检测电路的工作原理和通过面部表情特征的驾驶员疲劳状态识别的双重设计。采用AT89S51单片机作为控制核心设计了酒精浓度检测电路，包含酒精传感器电路，AD信号转换电路以及报警等重要模块。另外通过微型摄像头在驾驶过程中拍摄人面部表情，通过传送分析从而达到时时监控酒后驾车的目的。 论文给出了软件流程，并编写了软件。最后完成酒精浓度检测电路的制作和调试，该系统通过液晶显示器显示所测气体中的酒精浓度值，超过所设的阀值后实现语音报警功能，从而切断汽车的正常启动。本设计具有操作简单、成本低廉、可靠性高等优点。 [关键字]酒精传感器 单片机 报警 面部表情  Drinking and Driving Test System Design Song Chang Fei (Grade Tour, Class Two, Major thermal energy and power engineering ，Shaanxi University of Technology, Hanzhong 723003, Shaanxi) Tutor: Chang Hong Mei [abstract]This paper introduces the design of drunken driving detection system，gas sensor is presented based on the alcohol concentration measurement circuit principle of work and through the facial expressions of the pilot fatigue state recognition characteristics of double design . The AT89S51 micro controller as the core to control design of alcohol concentration measurement circuit. Contain alcohol sensor circuit, signal conversion of circuit and voice alarm, and other important modules .Another through the tiny cameras in driving process shooting people facial expressions, through the transfer analysis so as to achieve the purpose of every monitoring drunk driving. This paper Finally complete alcohol concentration measurement circuit production and test ,analyzes the software process, and write the software .The system through the liquid crystal display shows the density of the gas alcohol, more than the threshold set after realize voice alarm function ,Cut off the car to start normally. This design has simple operation, low cost and high reliability etc. [Key words] alcohol sensor sum alarm countenance 目 录 1前言 1 1.1相关技术的发展情况 2 1.2论文的主要工作 3 2概述酒后驾车检测系统的设计 4 2.1酒后驾车检测系统设计方案 4 2.2酒后驾车检测系统简易示意图及主程序框图 4 2.3酒后驾车系统设计简要分析 5 3 各电路的设计及分析 6 3.1传感器电路 6 3.1.1汽车酒精检测气敏传感器 6 3.1.2 气敏传感器的动态特性 7 3.1.3传感器的性能指标 7 3.1.4 反应传感器静态特性和动态的性能指标 7 3.1.5气敏电阻的工作原理及其特性 7 3.1.6传感器的选择 8 3.1.7输出结果说明 10