一种高精度自适应温控算法的设计与实现

Design and Application of a High-Accurate Adaptive Temperature Control Algorithm

PID控制结构简单、应用方便;模糊控制响应速度快、动态性能好,适用于控制难以建立精确数学模型或经常变化的对象。但对具有大惯性、纯滞后、非线性、受环境影响大等特点的复杂温控系统,PID控制无法取得理想的控制效果,而模糊控制又不能达到要求的控制精度。将PID和模糊控制结合起来,实现优势互补的思想,提出了一种高精度自适应温控算法,设计了算法流程、模糊推理规则等,并在单片机上实现了算法设计。试验结果表明,算法具有良好的适应性、稳定性和控制精度,控制效果明显优于PID控制,在恒温化学检测仪器中具有广阔的应用前景。

PID control is simple and being widely used. Fuzzy control has rapid response, good dynamic characteristics and is very suitable for the control of objects which don＇ t have accurate mathematical model and changing all the time. But for the big inertia, pure time-delay, nonlinearity are greatly affected by circumstances complex temperature control system. PID can not make good control, Fuzzy control can not achieve the required accuracy. If PID is combined with Fuzzy, the new control method will possess the ad- vantages of the two. Accroding to this idea, a high-accurate adaptive temperature control algorithm is proposed, and the algorithm flow and fuzzy reasoning rules were designed. The test results showed that the algorithm has good adaptability, stability, accuracy, much better performance than PID control and has a great application prospect on the field of constant-temperature chemical apparatus.