出租车计费器外文翻译中英对照培训讲学Word文件下载.docx
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faremeter'
sdesign
Abstract:
IntroducedthatonekindtakemonolithicintegratedcircuitAT89S52asthecoremulti-purposerentalcarmileagefaremeter'
sdesign,elaboratesinthesoftwareandhardwaredesignprocesskeytechnologiesprocessing.Thesimulationresultindicatedthatthismileagefaremeterhasthecollectionidearegulation,thetime,thecost,thememory,theexamination,thestatisticsandsoonmanykindsofmeasurementfunctions,andhastheoverspeedreminder,topreventthedrivertocheat,thepronunciation,theprintingandthedemonstrationandsoonmanykindsoffunctions.Compareswiththeexistingsystem,thissystemhastheoverspeedreminderandsoonastrongerfunction.
1introduction
1introductiontherentalcarmileagefaremeteristherentalcartransportbusinesschargespecial-purposeintellectualizedmeasuringappliance,alongwithelectronictechnology'
sdevelopment,therentalcarmileagefaremetertechnologyunceasinglyisalsoprogressingandenhances.Thedomesticrentalcarmileagefaremeterhadalreadyexperienced4stagedevelopment.Fromthetraditioncompletelythemechanicaltypewhichiscomposedofthemechanicalprimarydevice,namelyreplacesthepartmechanicalprimarydevice'
srentalcarmileagefaremetertohalfelectronicformulawiththeelectroniccircuit;
Againfromintegratedcircuittypetopresentmonolithicintegratedcircuitsystemdesignrentalcarmileagefaremeter.Therentalcarmileagefaremetercostiswhetheraccurate,thetaxidriverwhetheroverspeedisthepassengermostissueofconcern,butmileagefaremetertransportbusinessdatamanagementwhetherfacilitatesisthetaxidrivermostpaysattention.Howthereforetodesignonekindbothtobeabletopreventthedrivertocheateffectivelywithoverspeedandcanfacilitatedriver'
smileagefaremeterespeciallyimportant.Therefore,thisarticleasthecoredesignsamodelofmulti-purposerentalcarmileagefaremetertakemonolithicintegratedcircuitAT89S52,thismileagefaremetercanrealizethecoursevaluationandthedemonstration,thedatastorageandtheinquiry,theclockdemonstratedthattheoverspeedreminder,thepronunciationdisseminatenewswithfunctionsandsoonbillprinting.Itismoreconvenientthanthemarketinsomemileagefaremeteruse,functionentire,butalsohaspreventsthedrivertocheateffectivelywiththesystemstabilitygoodmerit.Inwhichoverspeedreminderfunctionmayremindthedriverandthepassenger,warnedthatthedriverdonotwanttoexceedthespeedlimit,avoidstrafficaccident'
soccurrence.
2 Systemhardwarestructureandfunctioncharacteristic
2.1 Overallplan
OverallplandesignblockdiagramasshowninFigure1,theoverallsystembymonolithicintegratedcircuitTheT89S52controlcircuit,A44EHallsensorelectriccircuitTheT24C02storagecircuit,theDS1302clockcircuit,theISD2560pronunciationdisseminatesnewstheelectriccircuit,thebillmarkingcircuit,thepressedkeyalignmentcircuit,theMAX7219actuationdisplaycircuitandthepowercircuitiscomposed.Themonolithicintegratedcircuitgathersandjudgesthespatialheadlightsignalandthedistanceexaminationsensorsignal,whentherentalcarstarts,themonolithicintegratedcircuitexaminestheHallsensor'
ssignalimpulseandcarriesonthecoursecomputation.Whendoesnothavethepassenger,themonolithicintegratedcircuittransfersthereal-timetimechipDS1302procedureandtheMAX7219serialportdemonstrationdriver,carriesontheclockdemonstrationwith4LED;
Theheadlightbreaksoffwhenintheskypassengerloading:
TheISD2560pronunciationdisseminatesnewstheelectriccircuittocarryonthepronunciationtodisseminatenews1(welcomepassengertoridethisrentalcar),throughtheDS1302gaintimeinformationresolutiondaytime/theevening,thentransfersTheT24C02proceduregaindaytime/evening'
sunitpriceandtheoutsetprice,thenstartsinformationandsoonvaluationandtelltime,courseandamount;
Theheadlightgetsthepassengertogetoutintheskytime:
Carriesondisseminatesnews2(thanksridesthisrentalcaroncemore,pleasehandoveramount),andprintsthegoodbill,themonolithicintegratedcircuitsavestransportbusinessdatamessageto24C02,waitedforaftertherentalcarstartsoncemore,singleinformationresetreplacementsandsoonamountandcourse,completeavaluationinlightofthis.
2.2 Hardwarecircuitdesign
Bythepowerunit,theHallsensordistancesurveypart,thedatademonstratedthatthepart,theclockpart,thepronunciationdisseminatenewsthepart,thebillprintingpartandthedatastoragepartandsooncompose,variouspartofportsareseparatelyconnectedwiththemonolithicintegratedcircuitAT89S52outlet,realizesmileagefaremeter'
sfunctionthroughmonolithicintegratedcircuit'
scontroltorealize.
2.2.1 Powerunit
Becausemileagefaremeter'
sworkingconditionsarequitebad,itrequeststohavetheanti-vibration,theanti-highlowtemperature,anti-moist,abilitiesandsoonanti-electromagneticinterference,whenspeciallythepowersourceaspect'
sdisturbance,liketherentalcarstarts,theengineflame,thestoragebatterychargeandsooncreateinputthemileagefaremeter+12Vpowersourcesnottobeunstable.Thereforeuses+12Vstoragebatterypowersourcesafterthefilterandthepowersourceconstantvoltagemanagementchip7805obtains+5Vregulatedvoltageoutputs,theguaranteeoverallsystemcanthenormalwork.
2.2.2 Distancesurveypart
Intherentalcarneedsonetobeabletoobtainthewheelrotationisthedistancemeasurementsignalinstallmentaccurately,byobtainsthestandardsignalimpulsetosendinthemonolithicintegratedcircuitfixedtime/counterT1isP3.5pins,completes100timeaftermonolithicintegratedcircuit'
sT1tallyfunctioncountinghaveaninterrupttocompletethedistancethesurvey.(supposeswheelperimeteris1m,thentheHallsensorproduces100thepulsethentoexpressthateverytimevehicletravelingschedule0.1km,hascarriedonestablishmentaccordingtoactualsituationinprocedure).Theautomobileshaftcouplingaccordingtothecirclespacinginsertingmagnetsteel,withHallthesensorintegrationchipA44Eexaminationandtheoutputpulse,HallsensorintegrationchipA44Ehasfunctionsandsoonsignalconversion,voltageamplification,reshapingoutput,toincreaseitsantijammingability,passesthrough74LS14afterthesignalshapingthetransmittedlightoccasionallysendsinP3again.5pins.Butinthiselectriccircuittopreventthedrivertomaketheshortcoming,mayusetheencryptionsensor'
smethod,firstcounterimpulseencryptionwhichgatherstotheHallsensor,causesthecostpulsebythescrambledtextwaytransmission,finallythedecipheristhedefiniteorderspulse,transmitstothemileagefaremetercost.Inpasswordsensor,whattheencryptiontransmitstothedecoderisthepassword,whentheencryptionandthedecipherinherentpasswordisthesame,decoderonlythentomileagefaremetertransmissioncounterimpulse,mileagefaremeteronlythencost,therefore,thepasswordsensorenhancedthemileagefaremetercostreliability,theillegaltaxidriverisalsounabletomakethefaretoincrease,simultaneouslythedrivercannotreplacethemileagefaremetersensorsecretly,realizedthemileagefaremetertounifytheinstallment,theserviceandtheannualinspectionglobaladministrationbytheNationalMeasurementDepartment.
2.2.3 Thedatademonstratedthepart,becausethedesignrequirementshavetheunitprice
(2),themidwaystandbyperiod
(2),thedistance(4),theamount(4)todemonstratethattheclock(4)output,ifusesLCDliquidcrystaldisplay,inisawayfromoutsidescreen1mtobeunabletoseeclearlythedata,moreovercannotsatisfytherequestindaytimeitscontrastgradient,thereforeuses16highluminanceLtheEDnixietubedemonstration.Whenisthespatialvehiclehour,fortheelectricitysaving,onlythetelltime,isforthedriverexaminedthatthetimeprovidestheconvenience,whenthedriverwantstoinquiretheformertransportbusinessdata,pressesinquiresthekeytobepossibletoprovidethedemonstration;
Whenpassengerdemonstratestransportbusinesstheunitprice,thestandbyperiod,thedistance,theamountandtheclock.DemonstratedthatdriverMAX7219hastheserialinput/paralleloutputfunction,mostmaydemonstratethat8LtheEDnixietube,simultaneouslyhasmaytobrightness,thedecodingway,thedemonstrationfigure,theworkingpatterncarryontheprogramming,verysatisfiedlong-distancerangedatademonstration;
MAX7219selectstheserialaddressingmethod,enterstheDINend16serialbitdata,ineachCLKrisealongismovedtotheinternal16shiftregister,intheLOADend'
srisealongislockedsavestocontrolsintheregisterandthedataregister,receivesfirstishighestorderD15,uses89S52inthiselectriccircuitP1.5arethedatamouth,P1.6aretheLOADend,P1.7lastbellend.Becausemustdemonstrate16LED,thereforeuses2pieceofMAX7219levelcompanytocarryontheactuationtodemonstrate,previouspieceofdataoutletandnextpieceofdatainputportconnectionuse.ButonmaincircuitboardTA89S52outputDIN,LOAD,CLKsignalwilltransmitindisplaypanel'
sprocesspossiblyasaresulttodisturbhasthedistortion,willthereforecarryonthereshapingthenagaintransmittedlightpartneronthedisplaypanelcircuitwafertothese3signals,willpreventthephenomenonoccurrencewhichthedatawrongthedemonstrationordidnotdemonstrate.
2.2.4 Clockpart
Themileagefaremeterwhentheren