新型汽车发动机冷却风扇智能控制系统的设计

TP3681190305721670SHANGHAIUNIVERSITYMASTER’SDissertation20081I,IIIII20081IVAThesisSubmittedtoShanghaiUniversityfortheDegreeofMasterinEngineeringTheDesignofIntelligentControllingSystemofAutomobileEngineCoolingFanMDCandidateZhuPengSupervisorYangWenrongYangSonghuaMajorMicroelectronics&SolidStateElectronicsMicroelectronicsR&DCenterShanghaiUniversityJanuary2008VABSPIC16F716PWMPWMPWMPWMPIC16F716PWMPIC16F716PIDPWMVIABSTRACTThecoolingsystemisanimportantpartofengine,ithasstronginfluencesonthepower,economyanddependabilityofengine.Withspeedandpowerofengineincreasing,thedemandofcoolingsystemishigher,sothedesignandresearchonthecoolingsystemofengineisalsobecomingmoreandmoreadvanced.Atthesametime,alongwiththerapiddevelopmentofautomotiveelectronictechnologyandmorematureofappliedtechnology,suchasejectsystem,airbag,ABSandotherkindofelectroniccontrolautomaticpart,electronictechnologyhasbeenappliedonalmostfieldofautomobile.Basedontheanalysisofthecurrentdomesticandforeignautomobileenginecoolingsystemandpresentsituationfoundation,thisdissertationproposesPWMcoolingfanscontrollersystem,whichdesignedPIC16F716microcontrollerascontrolcoreandDCmotorascontrolobject.Itappliestheexistingautomobileelectronicadvancedcontroltechnology,andreceivesmodulationPWMcoolingfansignalwhichissentoutbythemotorcarengine,andthenimprovethePWMfrequency,sothatthePWMsignalcanbedrivethecoolingfansdirectly.Withfunctionsofoverloadprotection,lockedrotorprotectionandshort-circuitprotection.Themainworkofthisdissertationisasfollows.First,thisdissertationintroducesthemathmodeloftheDC-PWMtimingsystemwiththebaseofthetheoryoftheDC-PWMtimingsystem.Andthen,onthebasisofanalyzingtherunningstatesofmotor,themathematicmodelsformotorprotectionarebuiltandseveralfailurecriterionsareproposed.Thenwedesignasynthesisalgorithm,whichusethePIC16F716,withthefunctionsofrotorprotectionandtheexactitudespeedregulation;Atlast,thecorrespondingcontrollingsoftwarewasdesignedforthissystembaseontheimprovedalgorithms.Inthedesignofthisdissertation,theprotectionparameterscanbesetbyusersothatscopeofapplicationisstretched;inthesoftware,thisdissertationsolvestheproblemofschedulemanytaskswiththeVIIbaseofthefansrunssafely.InordertoadapttheintegrationrequestofAutomotiveElectronicsTechnology,wedesigncommunicationsubsystemsfortheautomobileandthecoolingfanscontroller.Keywords:PIC16F716,PIDcontroltechnique,coolingfans,PWM,IntelligentmotorprotectorVIII.........................................................................................................................VABSTRACT.................................................................................................................VI...................................................................................................................VIII................................................................................................................11.1..................................................................................................11.2..................................................................................11.3..................................................................................21.4..........................................................................31.5..........................................................................................................................4PWM..................................................52.1..................................................................................................................52.2..............................................................................................................62.2.1PWM................................................................................62.2.2PWM............................................................72.3PWM..................................................................................82.3.1............................82.3.2......................................................................112.4PWM............................................................................132.5........................................................................................................................15..........................................................163.1....................................................................................................................163.2....................................................................................................163.2.1.........................................................................................163.2.2...................................................................................................173.2.3.................................................................................................183.2.4.............................................................................................203.2.5........................................................................................................