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本文研究的是以MCS-51系列单片机为核心的计算机控制系统,用以实现化工催化剂活性检测过程床层温度程序控制。被控对象是具有3～8分钟的纯滞后,时变,非线性特性的催化剂电加热炉。控制难度大。 采用了广义最小方差自校正控制算法,具有时变滞后的极点自校正PID算法,极点对消直接PID三种算法进行了仿真与现场试验研究。前两种,由于工作过程允许的信号对系统激励不够充分,对象在线辩识有困难,试验结果表现,不能实现预期的控制要求。最终采用了极点对消直接PID算法,成功地实现了催化剂活性温度自动控制。该系统工作稳定、可靠,控制精度达到了检测标准要求。
This paper studies the MCS-51 series microcontroller as the core of the computer control system, used to achieve chemical catalyst activity testing process bed temperature program control. The controlled object is a 3-to-8-minute catalyst hysteresis, time-varying, non-linear characteristics of the catalyst electric furnace. Control difficult. Adopting the generalized minimum variance self-tuning control algorithm, the pole self-tuning PID algorithm with time-varying lag and the pole-eliminating direct PID algorithm are simulated and field tested. The first two, due to the process of allowing the signal to the system is not sufficient incentives, the object is difficult to identify online, the test results, can not achieve the desired control requirements. Finally, the pole-cancellation direct PID algorithm was adopted, which successfully realized the automatic control of catalyst activity temperature. The system is stable and reliable, and the control precision reaches the test standard.