光电编码器输出脉冲的几种计数方法

潘明东(华东理工大学机械工程学院,上海市200237)=光电编码器是高精度位置控制系统常用的一种位移检测传感器在位置控制系统中,由于电机既可能正转,也可能反转,所以要对与其相连的编码器输出的脉冲进行计数,要求相应的计数器既能实现加计数,又能实现减计数,即进行可逆计数其计数的方法有多种,包括纯粹的软件计数和硬件计数文中分别对这两种常用的计数方法进行了分析,对其优缺点进行了对比,最后提出了一种新的计数方法,利用8051单片机内部的计数器实现对光电编码器输出脉冲的加减可逆计数,既节省了硬件资源,又能得到较高的计数频率:光电编码器,计数器,加减计数,位置控制:TP211收稿日期:2004-05-180引言,,,,A/D,,,,[1],AB90bAB90b,BA90b,,,,,,,,,,,,,,:,;,,1鉴相原理,,D111,AB90b,A,B;,AB90b,A,B,B[2]2用软件实现脉冲的鉴相和计数AINT0,BI/OP1.0,2,INT0,,,B,,1;,,1#69#30820048ELECTRONICENGINEERVol.30No.8Aug.200423用硬件实现脉冲的鉴相和计数,474LS1933,P0P1P2P34,;QAQBQCQD4,;MR,;PL,;CU,CD;TCU;TCD374LS193CUCD,,AB,,4,1D2,374LS193,AB90b,DŠQ(W1),Q(W2),N1,(W3),74LS193CU,;,N2,(W4),AB90b,DŠQ(W1),Q(W2),N1,(W3);,N2,(W4),74LS193CD,[3]44用单片机内部计数器实现可逆计数,,,,,,,,4,125,8051216(01),8052(2),380511,,/055D(DIR)INT0,INT1,AT0,,,DIR,INT1,#70###20048,;DIR,INT0,,(,)(C)#includereg51.hintdatak=1;voidservice_int0()interrupt0using0{k--;//1TR0=0;//TH0=-TH0;TL0=-TL0;//,TR0=1;//}voidservice_int1()interrupt2using1{k++;//1TR0=0;//TH0=-TH0;TL0=-TL0;//,TR0=1;//}voidtimer0(void)interrup1using2{if(k=0)//elseif(k=1)//0else//}voidmain(void){TCON=0X05;//TMOD=0X05;//T016IE=0X87;//TH0=0;TL0=0;//},,,5结束语,,CPU,,,,,,,,,21,[1],,,.FPGA.,2003,22(2):70~73[2],,,..,2003,25(3):87~90[3],..,2002,21(10):22~24SeveralMethodsofOutputPulseCountingforPhotoelectricEncoderPanMingdong(EastChinaUniversityofScienceandTechnology,Shanghai200237,China)=AbstractInpositioncontrolsystem,theelectromotorshouldbeabletoturnbackorforth,sothecounterdesignedtocountthepulseoutputfromthephotoelectricencoderconnectedtotheelectromotorshouldhavethefunc-tionofup-downcounting.Thatisreversiblecounting.Therearemanymethodstocountthepulseincludingsoftwarecountingandhardwarecounting.Thesetwomethodsofcountingareanalyzedinthispaper,andanewmethodofcountingissuggestedaftercomparingtheadvantagesanddisadvantagesofthem.Withfewerhardware,weobtainedahighspeedofreversiblecountingrateusingtheinternalcounterofthe8051MCU.Keywords:photoelectricencoder,counter,reversiblecounting,positioncontrol#71#308:##