溫度控制的PID算法的C語(yǔ)言程序

1、精選優(yōu)質(zhì)文檔-傾情為你奉上我的題目是：基于PID算法的溫度控制系統(tǒng) 89C51單片機(jī)，通過(guò)鍵盤(pán)輸入預(yù)設(shè)值，與DS18B20測(cè)得的實(shí)際值做比較，然后驅(qū)動(dòng)制冷或加熱電路。用keil C語(yǔ)言來(lái)實(shí)現(xiàn)PID的控制。 最佳答案/PID算法溫控C語(yǔ)言2008-08-17 18:58#include<reg51.h> #include<intrins.h> #include<math.h> #include<string.h> struct PI unsigned int SetPoint; / 設(shè)定目標(biāo) Desired Value unsigned int P

2、roportion; / 比例常數(shù) Proportional Const unsigned int Integral; / 積分常數(shù) Integral Const unsigned int LastError; / Error-1 unsigned int PrevError; / Error-2 unsigned int SumError; / Sums of Errors ; struct PI spid; / PI Control Structure unsigned int rout; / PIResponse (Output) unsigned int rin; / PI Feedb

3、ack (Input) sbit data1=P10; sbit clk=P11; sbit plus=P20; sbit subs=P21; sbit stop=P22; sbit output=P34; sbit DQ=P33; unsigned char flag,flag_1=0; unsigned char high_time,low_time,count=0;/占空比調(diào)節(jié)參數(shù) unsigned char set_temper=35; unsigned char temper; unsigned char i; unsigned char j=0; unsigned int s; /

4、* 延時(shí)子程序,延時(shí)時(shí)間以12M晶振為準(zhǔn),延時(shí)時(shí)間為30us×time */ void delay(unsigned char time) unsigned char m,n; for(n=0;n<time;n+) for(m=0;m<2;m+) /* 寫(xiě)一位數(shù)據(jù)子程序 */ void write_bit(unsigned char bitval) EA=0; DQ=0; /*拉低DQ以開(kāi)始一個(gè)寫(xiě)時(shí)序*/ if(bitval=1) _nop_(); DQ=1; /*如要寫(xiě)1，則將總線置高*/ delay(5); /*延時(shí)90us供DA18B20采樣*/ DQ=1; /*釋

5、放DQ總線*/ _nop_(); _nop_(); EA=1; /* 寫(xiě)一字節(jié)數(shù)據(jù)子程序 */ void write_byte(unsigned char val) unsigned char i; unsigned char temp; EA=0; /*關(guān)中斷*/TR0=0; for(i=0;i<8;i+) /*寫(xiě)一字節(jié)數(shù)據(jù)，一次寫(xiě)一位*/ temp=val>>i; /*移位操作，將本次要寫(xiě)的位移到最低位*/ temp=temp&1; write_bit(temp); /*向總線寫(xiě)該位*/ delay(7); /*延時(shí)120us后*/ / TR0=1; EA=1;

6、/*開(kāi)中斷*/ /* 讀一位數(shù)據(jù)子程序 */ unsigned char read_bit() unsigned char i,value_bit; EA=0; DQ=0; /*拉低DQ，開(kāi)始讀時(shí)序*/ _nop_(); _nop_(); DQ=1; /*釋放總線*/ for(i=0;i<2;i+) value_bit=DQ; EA=1; return(value_bit); /* 讀一字節(jié)數(shù)據(jù)子程序 */ unsigned char read_byte() unsigned char i,value=0; EA=0; for(i=0;i<8;i+) if(read_bit() /

7、*讀一字節(jié)數(shù)據(jù)，一個(gè)時(shí)序中讀一次，并作移位處理*/ value|=0x01<<i; delay(4); /*延時(shí)80us以完成此次都時(shí)序，之后再讀下一數(shù)據(jù)*/ EA=1; return(value); /* 復(fù)位子程序 */ unsigned char reset() unsigned char presence; EA=0; DQ=0; /*拉低DQ總線開(kāi)始復(fù)位*/ delay(30); /*保持低電平480us*/ DQ=1; /*釋放總線*/ delay(3); presence=DQ; /*獲取應(yīng)答信號(hào)*/ delay(28); /*延時(shí)以完成整個(gè)時(shí)序*/ EA=1; re

8、turn(presence); /*返回應(yīng)答信號(hào)，有芯片應(yīng)答返回0,無(wú)芯片則返回1*/ /* 獲取溫度子程序 */ void get_temper() unsigned char i,j; do i=reset(); /*復(fù)位*/ while(i!=0); /*1為無(wú)反饋信號(hào)*/ i=0xcc; /*發(fā)送設(shè)備定位命令*/ write_byte(i); i=0x44; /*發(fā)送開(kāi)始轉(zhuǎn)換命令*/ write_byte(i); delay(180); /*延時(shí)*/ do i=reset(); /*復(fù)位*/ while(i!=0); i=0xcc; /*設(shè)備定位*/ write_byte(i); i=

9、0xbe; /*讀出緩沖區(qū)內(nèi)容*/ write_byte(i); j=read_byte(); i=read_byte(); i=(i<<4)&0x7f; s=(unsigned int)(j&0x0f); s=(s*100)/16; j=j>>4; temper=i|j; /*獲取的溫度放在temper中*/ /*= Initialize PI Structure =*/ void PIInit (struct PI *pp) memset ( pp,0,sizeof(struct PI); /*= PI計(jì)算部分 =*/ unsigned int PI

10、Calc( struct PI *pp, unsigned int NextPoint ) unsigned int Error; Error = pp->SetPoint - NextPoint; / 偏差 pp->SumError += Error; / 積分 return (pp->Proportion * Error + pp->Integral * pp->SumError ) /比例、積分項(xiàng)/ /* 溫度比較處理子程序 */ compare_temper() unsigned char i; if(set_temper>temper) if(se

11、t_temper-temper>1) high_time=100; low_time=0; else for(i=0;i<10;i+) get_temper(); rin = s; / Read Input rout = PICalc ( &spid,rin ); / Perform PI Interation if (high_time<=100) high_time=(unsigned char)(rout/800); else high_time=100; low_time= (100-high_time); else if(set_temper<=tem

12、per) if(temper-set_temper>0) high_time=0; low_time=100; else for(i=0;i<10;i+) get_temper(); rin = s; / Read Input rout = PICalc ( &spid,rin ); / Perform PID Interation if (high_time<100) high_time=(unsigned char)(rout/10000); else high_time=0; low_time= (100-high_time); / else / /* T0中斷

13、服務(wù)子程序，用于控制電平的翻轉(zhuǎn) ,40us*100=4ms周期 */ void serve_T0() interrupt 1 using 1 if(+count<=(high_time) output=1; else if(count<=100) output=0; else count=0; TH0=0x2f; TL0=0xe0; /* 串行口中斷服務(wù)程序，用于上位機(jī)通訊 */ void serve_sio() interrupt 4 using 2 /* EA=0; RI=0; i=SBUF; if(i=2) while(RI=0) RI=0; set_temper=SBUF;

14、 SBUF=0x02; while(TI=0) TI=0; else if(i=3) TI=0; SBUF=temper; while(TI=0) TI=0; EA=1; */ void disp_1(unsigned char disp_num16) unsigned char n,a,m; for(n=0;n<6;n+) / k=disp_num1n; for(a=0;a<8;a+) clk=0; m=(disp_num1n&1); disp_num1n=disp_num1n>>1; if(m=1) data1=1; else data1=0; _nop_(

15、); clk=1; _nop_(); /* 顯示子程序 功能：將占空比溫度轉(zhuǎn)化為單個(gè)字符，顯示占空比和測(cè)得到的溫度 */ void display() unsigned char code number=0xfc,0x60,0xda,0xf2,0x66,0xb6,0xbe,0xe0,0xfe,0xf6; unsigned char disp_num6; unsigned int k,k1; k=high_time; k=k%1000; k1=k/100; if(k1=0) disp_num0=0; else disp_num0=0x60; k=k%100; disp_num1=numberk/

16、10; disp_num2=numberk%10; k=temper; k=k%100; disp_num3=numberk/10; disp_num4=numberk%10+1; disp_num5=numbers/10; disp_1(disp_num); /* 主程序 */ main() unsigned char z; unsigned char a,b,flag_2=1,count1=0; unsigned char phil=2,0xce,0x6e,0x60,0x1c,2; TMOD=0x21; TH0=0x2f; TL0=0x40; SCON=0x50; PCON=0x00; T

17、H1=0xfd; TL1=0xfd; PS=1; EA=1; EX1=0; ET0=1; ES=1; TR0=1; TR1=1; high_time=50; low_time=50; PIDInit ( &spid ); / Initialize Structure spid.Proportion = 10; / Set PID Coefficients spid.Integral = 8; spid.Derivative =6; spid.SetPoint = 100; / Set PID Setpoint while(1) if(plus=0) EA=0; for(a=0;a<5;a+) for(b=0;b<102;b+) if(plus=0) set_temper+; flag=0; else if(subs=0) for(a=0;a<5;a+) for(b=0;a<102;b+) if(subs=0) set_temper-; flag=0; else if(stop=0) for(a=0;a<5;a+) for(b=0;b<102;b+) if(stop=0) flag=0; break; EA=1; get_tem