摘要
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。
The control system of a microcomputer with microprocessor of series MCS-51 as core is discussed in this paper. It is used to realize the program control of the bed temperature in the measuring process of the activities of catalyst in chemical engineering. The controlled object is an electrical heater with large time-delay (3 - 8 min. ) , time-varying and non-linear characteristics. It is. very difficult to realize such a system. Three control algorithms were used : the wide-sense minimum variance self-tuning control, the time-varying, time-delay pole assignment self-tuning PID control and the pole cancelled direct PID control. Simulation studies and experimental investigations were made. Due to that the stimulation of the allowed signal on the system is not sufficient during operating process, the identification on line of the object fails frequently,and the first two methods cannot satisfy the expected control requisitions. At last the pole cancelled direct PID algorithm was used and the automatic control of temperature in measuring the catalyst activities was realized with success. The temperature control range is 0-800℃,with an accuracy of ± 1℃. This system has already been operated for twenty months. The operation is stable and reliable. The control accuracy satisfies the standard measuring requisitions.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
1993年第4期464-470,共7页
Journal of Nanjing University of Aeronautics & Astronautics
关键词
温度控制
电加热器
时滞系统
微机
temperature control, time delay characteristics, microcomputers, electrical heater,time -lag systems
