【正文】 算法是非線性的，這種非線性能被用來克服傳統(tǒng) PID 的限制。它實現(xiàn)了通過 編程在線 設(shè)定 PID 參數(shù)和提高系統(tǒng)控制的精度。所以給定一個能 適應(yīng)任何系統(tǒng)的固定值是非常困難的。 6 感謝 這篇文章得到山東省青年科學(xué)家鼓勵基金（項目號： ） ，山東自然科學(xué)基金（項目號 ： ） ，山東省重點學(xué)科（實驗）研究基金 的支持。 。 Abstract To meet the demands of temperature control accuracy in continuously sintering furnace with multiple hearths, this system was constituted with PC, XMT624 and solid state relay for temperature field control. According to the characteristics of heating process, temperature inertia, lag of sintering furnace, adopted intelligent PID algorithm to achieve the largescale temperature adjustments, it overes the limitation of traditional PID control. Through online setting intelligent instrument unit realtimely, the system achieves the target of temperature control accuracy in 2? per thousand centigrade. 1. Introduction Continuous sintering furnace is a monly used heating equipment for metal powder injection molding parts, it bines degrease and sintering processes. After rough parts track the degrease furnace, and then taken into horizontal continuous sintering furnace through an enclosed conveyor belt. The degrease furnace and sintering furnace are separated by two furnace doors. The main part of which is divided into heating, sintering and cooling. The sintering quality of continuous sintering furnace depends on the uniformity of temperature and the stability of sintering process, and the temperature control system of continuous sintering furnace is abig lag, great inertia, timedependent, nonlinear plex system, the sintering temperature is also affected by external factors, such as furnace door switches, gas flows. Therefore, using the traditional control is unable to meet continuous sintering furnace temperature control demands [12]. In analog control system, PID control is the most mature technology, and the most extensive application [34]. But the algorithm has some limitation in sintering furnace temperature control system that has the characteristic of great inertia, pure delay, nonlinear, timevarying, and reflected in the furnace is excessive control and dynamic performance instability. For example, the oneway nature of heating up due to sintering furnace using filament resistance, cooling is relying on the natural environment, and if the temperature is high, it is 2 difficult to cool down. It is difficult to establish precise mathematical method and determine the model parameters, and unable to control the temperature effectively. Computers and the development of intelligent control theory provide a new approach for the plex control and dynamic uncertainty systems. Using intelligent control technology promotes intelligent PID control. 2. Control system frame The temperature control system of multisegment continuous sintering furnace is mainly consisted of PC and XMT624 intelligent instrument, the executing agency is solidstate relay. The furnace is divided into three segments to control temperature, which means that each segment of the furnace has three temperature points. The frame of temperature control of the continuous sintering furnace is shown as figure 1. In allusion to every temperature section and every temperature point of the sintering furnace, adopt intelligent PID control solely. XMT624 according to the setting value and the reading measurement value calculates temperature deviations, and then intelligent PID controller controls solid state relay erroroff time to control furnace temperature and stability in the setting value. 3. Control algorithm Intelligent PID control algorithm [56] is the control algorithm base on 3 conventional PID control algorithm for the object that has characteristic of delay, timevarying and nonlinear