智能小车控制器中英文资料外文翻译文献大学论文.docx
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智能小车控制器中英文资料外文翻译文献大学论文.docx
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智能小车控制器中英文资料外文翻译文献大学论文
毕业论文中英文资料外文翻译文献
DesignofanIntelligentCarController
BasedonEmbeddedPlatform
Abstract:
ThepaperpresentsadesignofanintelligentcarcontrollerusingembeddedARM7chipsascorecomponent.Modularmethodhasbeenappliedinthedesignofthehardware;thepaperfocusesonlayoutoftrackingcircuitforthecaranddesignideasforthesoftware.Theexperimentresultprovesthatthedesignedintelligentcarisstableinoperationandgoodintrackingperformance.
Keywords:
ARMIntelligentTracking
1、Introduction
Inthe21stcentury,withdevelopmentofscienceandtechnology,researchesonintelligentcaranditscorrelativetechniqueshavebecomethefocusinthisfield.Aimingtoenhancepracticalability,innovation,andteamworkperformanceofcollegestudentsacrossthecountry,theEducationDepartmentsponsoredNationalUndergraduateIntelligentCarContest.Basedonthebackground,thepaperintroducesthedesignofmultifunctionalintelligentcarcontrolleronembeddedplatform,includingdesignofhardwarecircuitandsoftwareimplementationforkeyfunctionalmodules.
2、Designofhardware
Byfunctionandapplication,thecontrollingplatformfortheintelligentcarisdividedintoseveralmodulesasshownbelow.
2.1Designofcoremodule
AT91SAM7S256microprocessorproducedbyATMELhasbeenadoptedforthecontrollerofthecar,whicha32-bitlow-powerRISCmicroprocessorchipbasedonARM7TDMI-Score,andembeddedwith64KBSARM,256KBhigh-speedFlashandJTAGportfordownloadingordebuggingoftheprogram.Asthecorecomponentofthecar,themicroprocessorplaysakeyroleincontrollingallrunningstatusesofthecar.PWMgeneratingmoduleinsideitcanbechangedutycycleofoutputtedsquarewavebyprogramming,andthuschangethevoltageloadedontheDCmotor,whichisamplifiedtocontroltherevolutionspeedofthemotor.TheportsPA0,PA1,PA2andPA3ofthePWMmodulerespectivelycontroltheDCmotorandthesteeringmotortoperformfunctionssuchasgoforward,retreatandturnetc.
2.2Designofpowermodule
ThecarispoweredbyfourAAdrybatteries.Thevoltageisoutputtedthroughlow-NoiseLDOregulatorMIC5209-3.3tosupplypowerforARM7chipsandperipheralcircuits.TheworkingcurrentofMIC5209-3.3isashighas500mA.Wheninputvoltageisabove3.5V,themoduleofMIC5209-3.3canoutputstablevoltageof3.3Vandachievelowpowerconsumption.
2.3TemperaturedetectionModule
Mono-linedigitaltemperaturesensorDS18B20isusedtodetecttemperatureinthecar.Themeasurerangeisfrom-55℃to+125℃,withincrementof0.5℃.Itislowinpowerconsumptionandsmallinsize,occupyingonlyoneI/Oport.
2.4Autotrackingmodule
2.4.1Principlesfortrackingofintelligentcar
Trackingmeansthatthecargoesalongthetwo-centimeter-wideblackguidelineonthewhitefloor.Infraredacquisitionandcamerashootingacquisitionarecommonlyusedforit.
Infraredacquisition:
Takingadvantageofthefeaturethatinfraredlightcanchangeitsreflectivequalityaccordingtoobjectsurfaceofvariouscolors.Duringrunningthecarcontinuouslysendsinfraredlighttotheground,whichwill,eitherbereflectedbackbythewhitefloorandreceivedbythereceivingtubeinthecar,orbeabsorbedbytheblackguidelineandthusmissedbythereceivingtube.Bythismeanstheblackguidelineispositionedtoidentifythepathforthecar.
Camerashootingacquisition:
Incertainresolutionsampletheimagebyinterlacedscanning.Whenscanningapoint,imagesensortransfersthegraythresholdintocorrespondingvoltagewhichwillbeoutputtedviavideosignalport.Asthecarachievesautotrackingbyrecognizingtheblackguidelineonthetrack,theimageprocessingisaprocessofextractingthedestinationguideline.Thetaskofimageprocessingprogramistoidentifythedotsintheblack-and-whiteimageandfilternoise,recorddotpositionsrelativetotheimage,andfinally,byalgorithmofcontrolstrategy,realizetrackingandturningofthecaralongtheguideline.
2.4.2Installationoftrackinginfraredprobe
Choosingproperdetectionmethodandsensoristheimportantfactortoachievetracking.Herewechooseinfraredacquisition.Correctinstallationofdeviceisalsoadecisivefactorforaccomplishmentoftrackingcircuit.Intermsofsimplicity,easiness,practicalityandreliability,fourinfraredprobesneedbeinstalledonthefrontchassisofthecartofulfilltwo-stageddirectionalcorrectioncontroltoenhancethereliabilityoftracking.Fourtrackingsensorshavebeenfixed,allinoneline,amongwhichL1andR1areprimarysensorsfordirectioncontrol;L2andR2aresecondarysensors.Thedistancebetweenthetwoipsilateralsensorsshouldnorbemorethanwidthoftheblackdirectioncontrol.Whenthecarisrunning,theblackguidelineisalwayskeptrightbetweenthetwo
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