基于数字PID和89C52单片机的温度控制系统

针对在工业生产过程中经常需要高稳定度的恒温环境，传统模拟式仪表结合简单的PID控制较难达到目标的情况．提出了基于数字PID控制算法和89C52单片机的温度控制系统。该系统通过温度传感器DS1820对温度进行采样和转换．然后执行数字PID控制，输出控制量来调节可控硅触发端的通断，从而实现对温度的控制。水温可以在一定范围内由人工设定，并能在环境温度降低时实现自动调整。结果表明：通过将数字PID算法和89C52单片机结合使用，使整个控制系统的温度控制精度提高了10％，输出温度的误差小于2％，不仅满足了对温度控制的要求，而且还可应用到对其它变量的控制过程当中。

Temperature control system based on digital PID and 89C52 single-chip microcomputer

Aiming at high stable constant-temperature environment is required frequently in industrial production,the traditional simulation-like probe and simple PID control method are difficult to reach the ideal demand. This paper introduces a control temperature system based on digital PID control method and 89C52 single-chip microcomputer. This system samples and changes temperature through temperature sensor DS1820,then carries on a PID control,meanwhile, outputs the control quantity to adjust the angle of flow of silicon controlled. Thus the system will control temperature. The water temperature may be set at some degree and auto-adjusted as environmental temperature changes. The results shows that temperature control precision of the whole control system can be improved by 10%,output error of the temperature is less than 2% ,through the digital PID algorithm and 89C52 microcontroller used in combination. It not only satisfies the requirements for temperature control, but also is applied in the control process of other variables.