热电偶自动检定炉模糊PID温度控制系统的设计

Design of fuzzy PID temperature control system of thermocouple automatic verification furnace

在传统的热电偶检定过程中,检定接线非常复杂,目前大多数热电偶检定炉均使用PID控制器对检定过程的炉温进行控制,当检定过程中系统工作环境发生变化时,调节时间与精度并不能达到所需要求,以致于检定结果误差不能达到最小。上述因素引起的测量误差直接影响所测温度值传递的准确性。由此可见,传统的检定炉温度控制方法已难以适应现代质量管理的需要,改革温控方法势在必行。文章将模糊算法与传统PID算法相结合设计了模糊PID控制器,并使用Matlab进行了仿真,与常规PID控制器的性能进行了对比,结果表明,模糊自适应PID控制器的响应特性优于传统的PID控制器,响应速度更快,稳态精度更高,超调量更小,提高了高温炉温度控制系统的性能。

In the traditional verification process of thermocouple, the verification connection is very complicated. At present, most of the thermocouple verification furnaces use PID controller to control the temperature of the Verification Process.The adjustment time and precision cannot reach the requirement, so that the error of the verification result cannot reach the minimum. The measurement error caused by the above factors directly affects the accuracy of temperature value transfer. Therefore, it is necessary to reform the traditional temperature control method of calibration furnace, which cannot meet the needs of modern quality management. This thesis uses the self-tuning fuzzy PID control algorithm to design the fuzzy PID controller and semulated by Matlab. The results show that the response characteristic of the model and adaptive PID controller is better than that of the traditional PID controller, the response speed is faster, the steady precision is higher, and the overshoot is smaller The performance of high temperature furnace temperature control system is improved.