基于电流纹波纯硬件波形转化的车窗防夹设计-许师中

221Vol．22No．120142JournalofXiamenUniversi[e-mail]361024－．．、。－U463TP29B1673－4432201401－0011－06．FMVSSll8100N．2012100N．100N4～200mm1．100N．．、—、．1．、．．．．1.1Ut=et+Ｒit+Ldi/dt．1et=kΩt．22014mt=kit．3JdΩ/dt=mt－fΩt．41～4UtetitＲLJfΩkmt．4Up=Ep+ＲIp+pLIp．5Ep=kΩp．6pJΩp=Mp－fΩp．7Mp=kIp．85—8p．1.21.2.1fUp=k2/pJ+f+Ｒ+pLIp．9U、Ｒ、L、J、k、p．9fIp．．玻璃正常上升阶段玻璃正常上升阶段电机通电瞬间第一次受阻第二次受阻玻璃正常到顶阶段图1电动车窗完整升窗过程的电流波形Fig.1Currentwaveformoftherisingprocessofwindow1234停止500.00.0501abcd。、．1.2.2fkUp=pJ+fＲ+pL+k2Ωp．1010fΩp。。．．。2．1.2.3、1。knfi=kn34·21·1图2霍尔传感器信号与电流纹波信号周期比较[4]Fig.2CyclecomparisonofHSsignalandcurrentripplefh=1～4nN=fi/fh=k/1～4．2N10．．5．－．、3．．1.2.4．S12MagniV/S12VＲ6．．2．．．－．2.1．、．、、MCU．、、．．·31·201450msMCU20cm．2.23Fig.3Flowdiagramofanti－pinchwindow、1kHz3．2.3－－．2.3.110mΩＲe．PIC16F877A/DＲA01kHz－PIC16F877I/OINT．、1kHz、－－．4．图4电流信号采集、转换电路Fig.4Collectionandtransformationcircuitofcurrentsignal纹波平滑电路VbatR201R203ReR202R204R221R220R205R206R207C214C213C201C202C20310K680K680K1K2K1K10K10m赘32156755221D206LMP7708LMP7708去电机VCCL202110.1滋F10滋F10滋F0.47滋F0.1滋F15K1kHz低通滤波电路纹波-方波转化模块RA0INTPIC16F877AU2B+-U2A+-42.3.21LMP7708·41·1130dB．Ｒe10mΩＲeZ=1/2πfCZＲe10mΩf=1kHzC≈0.016F．251kHz、－1KHz1kHz．3PCB10mΩPCBＲe．4、、．．345、6．5～61、2．6815I0≈2/Ｒe×68≈3AT0≈1.8msf0≈550Hz、．26Imax≈7/Ｒe×68≈10A3T1=5.6msT2=7.6msT3≈12.5msf1≈180Hzf2=132Hzf3≈80Hz、．图5车窗玻璃正常升降电流纹波转化结果Fig.5Currentrippletransformationinnormalrisingwindow图6车窗玻璃到顶前后的电流纹波转化结果Fig.6Currentrippletransformationofrisingwindowbeforeandafteritstop、．·51·20144－．“+”31MCU2－3MCUA/D、．．1．GB11552—2009S．2010．2．J．200830121122-1124．3．J．201058615-618．4．J．2009188-90．5．J．2012715-18．6FreescaleSemiconductorInc．Anti－PinchwindowliftreferencedesignDB/OL．http//cache．freescale．com/files/microcontrollers/doc/fact_sheet/ＲDS12VＲFS．pdffpsp=1DesignofthePowerWindowsAnti-pinchBasedontheCurrentＲippleWaveformTransformationwithPureHardwareXUShi-zhong(SchoolofMechanical＆AutomotiveEngineering，XiamenUniversityofTechnology，Xiamen361024，China)Abstract:Aripple－squarewavetransformationmodulewithpurehardwarecircuitwasdesignedaimingatmeetingtherequirementsoffastresponseandsecurityforpowerwindowssystem．ThemodulecoulddigitizethecurrentrippleofwindowmotortoachievethesquaresignalssimilartothosebyHallsensors．ThesquaresignalshadfrequencymanytimesthatoftheHallsensorsignalsandcanbeusedtodeterminethemotorspeed．Whencombinedwiththemethodsofmotorcurrentvaluedetection，thesignalscouldbeaproductsolutiontopowerwindowpinch．Testsshowthatthisanti-pinchsolutionisstable，reliableandfastinresponse，worthyofpracticaluseandmarketpromotion．Keywords:powerwindow;anti-pinchfunction;currentripple;ripple-squarewavetransformationmodule;Hallsensor·61·