C语言PID温度控制程序这里面cnt_10ms=0有什么用？

ID:923404 · 发表于 2021-5-18 17:40

void Timer1Interrupt(void) interrupt 3
{
      static unsigned int value1,cnt_10ms=0;
TH1 = 0x0D8;//10ms
TL1 = 0x0F0;
      value1++;
      cnt_10ms = 0;
      if(wendu > 20)       //实际温度过高打开PID 制冷
      {
            err = wendu - 20;       //误差
            err_add += err;                                        //累计误差
            err_weifen = err -       last_err;       //误差变化率
            last_err = err;                                        //更新误差
            PWM_Fan = PID_P * err + PID_I * err_add + PID_D * err_weifen;
            PWM_Heat = 0;
      }
      else if(wendu < 20)       //实际温度过低打开PID 运行加热
      {
            err = 20 - wendu;       //误差
            err_add += err;                                        //累计误差
            err_weifen = err -       last_err;       //误差变化率
            last_err = err;                                        //更新误差
            PWM_Heat = PID_P * err + PID_I * err_add + PID_D * err_weifen;
            PWM_Fan = 0;
      }
      else
      {
            PWM_Heat = 0;
            PWM_Fan = 0;
      }
      if(value1<PWM_Fan)//占空比控制输出
      {
            Fan_Diode = 1;
      }
      else
      {
            Fan_Diode = 0;
      }
      if(value1<PWM_Heat)//占空比控制输出
      {
            Heat_Diode = 1;
      }
      else
      {
            Heat_Diode = 0;
      }
      if(value1>100)
      {
            value1 = 0;
      }
}