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1学号：***********毕业论文汽车防撞报警系统设计Automotivecollisionavoidancealarmsystemdesign学院计算机与电子信息学院专业电子信息科学与技术班级电子09-1学生***指导教师（职称）刘利民（讲师）完成时间2013年03月25日至2013年06月15日广东石油化工学院本科毕业(设计)论文：汽车防撞报警系统设计2摘要随着经济的高速发展和居民生活水平的不断提高，我国汽车数量逐年递增，各类交通事故频发,其中多为汽车碰撞事故。为此本文设计了一种以超声波测距和AT89C51单片机为核心的汽车防撞报警系统，以期提高汽车运行的安全性，减少交通事故。该系统根据超声波测距原理，以AT89C51为核心，设计了汽车防撞报警系统，主要是将单片机控制模块、超声波测距模块、蜂鸣器报警模块、4位数码管显示模块这几个模块结合起来，通过编写的KeilC51“.C”文件来实现测量距离，当距离小于阈值时，发出报警。本设计的核心是超声波测距模块，其他相关模块都是在测距的基础上拓展起来的，测距模块是利用超声波传感器。该系统可提高汽车行进过程中的安全性，构建汽车安全空间。关键词：超声波传感器；测距；防撞；报警；AT89C513ABSTRACTWiththehigh-speeddevelopmentofeconomyandpeoplelifelevelunceasingenhancement,carownershipinChinaincreasingeveryyear,allkindsoffrequenttrafficaccidents,mostlycarcollisionaccident.ThispaperdesignedakindofultrasonicrangingandAT89C51asthecoreofautomotiveanti-collisionalarmsystem,soastoenhancethesafetyofvehiclerunning,reducetrafficaccidents.Accordingtotheprincipleofultrasonicranging,thissystemusesUSESAT89C51asthecore,thedesignoftheautomotiveanti-collisionalarmsystem,themainisthesingle-chipmicrocomputercontrolmodule,ultrasonicdistancemeasuringmodule,abuzzeralarmmodule,thefourdigitaltubedisplaymodulethatcombinesseveralmodules,writtenbyKeilC51.Cfilestoachievethemeasurementdistance,whenthedistanceislessthanthethreshold,issuedareporttothepolice.Thisdesignisthecoreoftheultrasonicrangingmodule,onthebasisofotherrelatedmodulesareintherangeexpansion,rangingmoduleistouseultrasonicsensors.Thesystemcanimprovethesafetyofvehiclesintheprocessofmarching,buildspaceofautomotivesafety.Keywords：ultrasonicsensor;distancemeasurement;avoidingcollision;giveanalarm;AT89C51广东石油化工学院本科毕业(设计)论文：汽车防撞报警系统设计4目录摘要...............................................................................................................................................................2ABSTRACT....................................................................................................................................................3目录...............................................................................................................................................................4第一章绪论.................................................................................................................................................61.1课题研究背景及意义.......................................................................................................................61.2国内外安全防撞预警系统的研究现状...........................................................................................91.2.1国外安全防撞预警系统的研究现状....................................................................................91.2.2国内安全防撞预警系统的研究现状..................................................................................101.3论文的主要内容和章节安排.........................................................................................................11第二章防撞预警系统安全距离模型、决策系统.....................................................................................122.1行车安全距离.................................................................................................................................122.2汽车制动距离.................................................................................................................................122.3驾驶员预估模型报警算法............................................................................................................12本章小结...............................................................................................................................................14第三章超声波及其工作原理.....................................................................................................................153.1超声波传感器介绍.........................................................................................................................153.2超声波传感器的特性.....................................................................................................................163.3超声波测距的工作原理及实现.....................................................................................................173.4测距系统的主要参数....................................................................................................................19本章小结...............................................................................................................................................20第四章防撞预警系统的总体方案.............................................................................................................214.1设计方案........................................................................................................................................214.1.1测距传感器..........................................................................................................................214.1.2超声波时序图.....................................................................................................................224.2系统总方案....................................................................................................................................23本章小结......................................