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1、摘要汽车倒车测距仪的设计摘要汽车倒车雷达是针对当前公路、街道、停车场、车库等越来越拥挤,加上存在视觉盲区,无法看见车后的障碍物,司机在倒车时很容易刮伤汽车,甚至发生事故的情况而出现的一种旨在倒车防护的汽车防撞系统。该系统能够在汽车以较低的速度进行倒车的过程中,识别出车后部的障碍物,并能够测量车与障碍物之间的距离,在车辆与障碍物发生碰撞前,发出声光报警,提醒司机刹车。本设计从实验研究分析的角度,分析了超声波测距原理以及国内外此类汽车倒车雷达存在的问题,提出了目前最简单、实用的一种倒车雷达实现方案,即基于成都国腾微电子公司GM3101倒车雷达芯片为核心的
2、超声波测距倒车雷达,该芯片功能集成度高,外围只需接上超声波传感器和功率器件就可以实现整个系统功能,也不需要软件编程。同时设计中围绕目前呼声很高的汽车电器网络化实现,提出倒车雷达数据基于新型总线XY-CNBUS的传递方案。系统设计中采用了模块设计思想,简化了调试工作量,最终很好完成了超声波测距倒车雷达系统的硬件设计、软件设计及系统调试。关键词:汽车倒车雷达超声波GM3101芯片XY-CNBUS汽车电器网络化ⅠAbstractAbstractAutomobileReversingRadar(‘ARR’)isaprotectionsystemwhichap
3、pearedintheconditionofthatthecarsarescratchedeasily,evensomeoftheaccidentshappenwhendriversreverse,forthereasonofthatthecurrenthighway,street,parkinglotsandgaragesaregettingmorecrowded,andthedriversareunabletoseeobstaclesbehindthevehiclebecauseoftheexistenceofvisualblindspots,a
4、imedatpreventacarcrashwhenreversing.Thereversingradarsystem,whichcanrecognizethebarrieratthebackofcarwhenthevehiclesreverseatalowspeed,andiscapableofmeasuringthedistancebetweenthevehicleandobstacles,warnedthedriverstobrakeatthewayofsoundandlight,beforethecollisionoccurred.Thede
5、signanalyzeshowtheultrasonicmeasuredistanceandwhattheproblemoftheotherautomobilereversingradarswhichhaveappearedathomeandabroadare,fromtheperspectiveofresearchandanalysis.ThenintroducingthemostsimpleandpracticalwayatpresenttomaketheARR,thatis,theARRbasedintheGM8101chipwhichprod
6、ucedinChengDuGuoTengMicroelectronicsCompany.Thechipisintegratedhighly,canfunctionasawholesystembyonlyconnectingtoexternalultrasonicsensorandpowerdevice,anddoesnotrequiresoftwareprogramming.Meanwhile,astheresearchaboutrealizingthevehicleelectricalnetworkisbecomingmoreandmorepopu
7、lartoday,aprogramthatthedataoftheARRistransferredinanewkindofbuscalledasXY-CN.Amodulardesignconceptwasusedattheprocessofdesigningthesystem,itsimplifiesthedebuggingworkload.Ultimately,hardwaredesign,softwaredesignandsystemdebuggingabouttheARRwascompletedverywell.Keywords:Automob
8、ileReversingRadarultrasonicGM3101XY-CNBUSrealizationof