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摘 要在当今经济与科技都快速发展的社会，国家因为汽车行业的快速发展得到了巨大的经济效益。有了汽车行驶状态记录仪后当车辆发生交通事故后交管部门可以凭借记录的内容作为交通事故分析和事故责任分配的证据。38496
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本设计题目针对汽车行驶状态记录仪进行系统设计，能够实时监测并记录汽车行驶的状态信息，主要包括汽车自身寿命使用情况，违法违规等驾驶员操作情况记录及收集数据进行相关设定的标准判断，比如驾驶员是否超速或者疲劳驾驶等系统会发出报警。为了实现上述功能则以AT89S8252单片机为核心作为主要研
究对象，选用开关型霍尔传感器来采集车速信号，接收到的差分信号经过适当的转换变成脉冲信号传给CPU芯片。单片机系统将采集到的信息处理后存储起来以作备用。从而实现了汽车行驶过程中实施的信息采集、处理、传送和存储，再通过通信接口将数据传送到上位机进行统计显示，为每个驾驶员提供驾驶信息和汽车信息以方便有关部门检查。
毕业论文关键词： 汽车行驶状态记录仪 AT89S8252单片机 脉冲信号
Abstract In today's economy and technology are rapidly developing society, the State because of the rapid development of the automotive industry has been a huge economic benefits. When the vehicle driving state recorder is installed in the car, it can monitor the condition of the car, the prevention of traffic accidents, while the whole record car and driving real-time operational status screen. Thus when the vehicle is involved in a traffic accident the traffic control department can rely on the contents of the recording as evidence in Traffic Accident Analysis and distribution of responsibility for the accident.
The criteria for judging a design for cars with state recorder system design, real-time monitoring and recording status cars, including the driver's operation of the recording and collection of data use the car's own life, illegal and other related settings , such as whether the driver is speeding or fatigue driving system will issue a warning. To achieve the above function places AT89S8252 microcontroller core as the main object of study, the choice of switching Hall sensor speed signal acquisition, the Hall sensor received differential signal through the appropriate conversion into a pulse signal to the microcontroller system, SCM system collected after the operation processing stored information as a backup to . Enabling the vehicle was implemented in information collection, processing, transmission and storage, and through the communication interface to transfer data to the host computer for statistics, providing removable memory cards used to record for each driver and car driver information relevant information to facilitate the examination.
Key word：Cars with state recorder AT89S8252SCM Pulse signal
目录
摘 要 I
Abstract II
1 绪论 1
1.1 课题研究背景及意义 1
1.2 国内外研究现状 1
1.2.1 国外研究现状 1
1.2.2 国内研究现状 2
1.3 本论文主要研究内容 2
2 系统整体设计思路 3
2.1 系统整体方案 3
2.2 AT89S8252单片机的选用 4
2.2.1 AT89S8252的概述 4
2.2.2 AT89S8252的特性及功能描述 4
3 硬件电路设计 6
3.1供电模块 6
3.2信号采集模块 7
3.3 单片机最小系统 9
3.4 可编程逻辑器件 11
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