【正文】 emperature changes resulting changes, changes in temperature regulation only after opening the gas valve to change the gas supply, resulting in The process of time lag, so that the object is equivalent to a long delay time, thereby achieving the desired control effect. For these parameters with the incident and nonlinear time delay, large inertia of the control problem, the more popular abroad, is the Dahlin control algorithm and the Smith predictive control. Smith predictive control feature is the process of preestimated in the basic dynamic characteristics of disturbances, then the predictor to pensate for process control technology. The basic idea is based on process characteristics to design a model of feedback control system to pensate for the dynamic nature of the process, and then by the predictor to pensate, trying to control the lag time was reflected in advance to the controller, the control Control early action, which significantly reduced the overshoot, speed up the adjustment process. Especially for those accused of objects with varying degrees of delay, while the controlled object can not reflect the system time of the perturbed system under the system, Smith predictive control techniques have gained wide use.Gas flow control mechanism inherent plexity of the process, the slow response of the control action, is closely related parameters. In this paper, this type of industrial furnace temperature control system design and technological transformation of the status quo, put forward by the master control loop circuit and vice matched by the second design in the vice control loop disturbance, a disturbance in the main control loop design of Smith predictor Cascade control, you can get better control effect.1 structure of the system Experiments and experience show that the temperature control object can be approximated as a pure lag element and an integral part of the first order form. Y is selected discharge temperature and gas flow rate Q to form the cascade servo control of the puter, and supplemented by the technical design of the Smith predictor control system. Figure TC said thermostat, FC, said gas flow regulator. TC usually thermostat PID regulation law, the gas flow regulator PI regulation by law of FC, SC Smith predictor. Smith predictor controller as a model to the feedback control loop to pensate for the dynamic nature of the process, bringing the temperature ahead of the object reflects the delay time to the controller, to effectively solve the large inertia of the time lag and pray to reduce the system overshoot, speed up the adjustment process in the role of the system. When the temperature changes, control by the main regulator, the regulator output as Vice given value, and ultimately control the gas valve opening. The output of the master circuit control loop settings as amended, vice basis, the Deputy control loop output as a true vacancy acting on the charged object. Changes in gas flow in the event, Deputy control loop to control the timely opening of the valve position, gas flows quickly overe the change of the material temperature.Smith predictor in the cascade control system, the valve position and gas flow regulation in a timely manner, and have some adaptive ability to effectively solve the object equivalent delay time is very long question. The second major disturbance for the system disturbance, the main disturbance of the system included in the vice control loop, the regulation control loop through the Deputy role in the disturbance to the main control loop parameters to be adjusted before the greatly weakened the impact of disturbance. Vice control loop includes integrator, reducing the lag phase, thus improving the dynamic quality of the system. When the disturbance occurred in the Viceloop, the occurrence of such fluctuations in gas flow caused by temperature changes, due to the presence of Vicecontrol loop, the gas flow regulator to timely action, rapid elimination of the impact of the disturbance。s operating frequency.Cascade control of the system shown in Figure 5. The figure, Qr is given the value of gas flow, D1, D2 is the temperature by puter digital controller digital controller and flow, the general master loop sampling period T and vice control loop sampling period T equal approach control. If you use the master loop sampling period T and vice control loop sampling time T is equal to control, in order to avoid the master control loop and vice mutual interference between circuits and resonance, should make the difference between T and T 3 times2 Conclusion In the industrial processes, materials, energy, time delay caused by transmission problems is the traditional PID controller, the control can not solved the problem. Conventional PID control system for the delay large, nonlinear strong, the plexity of the slow response to control signals thermal process, often can not obtain a satisfactory control effect. Furnace temperature control problem is a typical time lag. Smith predictive control technology and the gas flow cascade control applications in the system, play time detection system may cause changes in the controlled volume and controlled some of the factors, the object is equivalent to effectively overe the problem a long time, and has robust features and improved control system for the regulation of quality. The main disturbance of the system included in the vice control loop, the regulation control loop through the Deputy role in the disturbance to the main control loop parameters to be adjusted before the greatly weakened the impact of disturbance. This control method in heat, chemicals, machinery processing, metal smelting and other industries also have a wide range of uses and promotion of value.附錄B附錄B（中文譯文）Smith預(yù)估控制技術(shù)在爐溫控制系統(tǒng)中的應(yīng)用摘要：分析用煤氣作為燃料、同一煤氣總管道給多臺(tái)熱爐加熱引起爐溫變化的原因，傳統(tǒng)PID控制普遍存在的時(shí)間滯后問(wèn)題，介紹史密斯預(yù)估控制原理，介紹串級(jí)控制與史密斯預(yù)估控制相結(jié)合的自動(dòng)控制技術(shù)在爐溫控制系統(tǒng)的應(yīng)用及實(shí)現(xiàn)。對(duì)于這種情況史密斯（Smith）控制算法在鍋爐溫度控制中的應(yīng)用，使得鍋爐溫度控制能夠達(dá)到一個(gè)穩(wěn)