(一)前言在化工生产过程中,由于物料的输送、传热、传质等过程常常存在着相当大的纯滞后,例如大型管式加热炉、精馏塔、某些化学反应器都存在着一定的纯滞后。随着质量仪表在线控制的逐步应用,纯滞后的矛盾就更为突出。常规的PID调节对于克服纯滞后,难以获得较好的调节品质,诸如回复时间过长,超调量较大等。虽然国内外已有不少研究,也有几种方法,例如Smith法、采样调节等,但是对于较大纯滞后的控制,不 (A) Preface In the chemical production process, due to the material transport, heat transfer, mass transfer process often there is a considerable net lag, such as large tube furnace, distillation column, some chemical reactors exist A certain amount of hysteresis. With the gradual application of online quality control instruments, the contradiction between pure lag is even more prominent. Conventional PID regulation for overcoming the hysteresis, it is difficult to obtain a better adjustment of quality, such as the recovery time is too long, large overshoot and so on. Although there are many studies both at home and abroad, there are several methods, such as Smith method, sampling adjustment and so on, but for the control of large pure hysteresis,