基于安排过渡过程的制冷机控温策略设计

Design of cryocooler algorithm based on arranging the transient process

为解决斯特林制冷机控制系统中经典PID闭环控制器易出现积分饱和而带来性能下降的问题,提出一种基于安排过渡过程的制冷机控温策略,在经典PID控制器的基础上,对控温点的切换安排平滑渐变的过渡过程。以斯特林制冷机系统作为研究对象,重点分析了制冷机系统的模型、经典PID控制策略的局限性、过渡过程的原理和可行性方案,基于计算机仿真与实物试验的方式对其进行验证,结果表明,调节时间缩短为原指标的56%,超调量减少为原指标的22%。该方案对于制冷机系统控温性能的提升起到显著作用。

A temperature-control algorithm of cryocooler based on arranging the transient process was proposed to solve the performance-degradation problem caused by integral saturation of PID controller. A Stirling cryocooler was taken as research object to mainly analyse the mathematic model of cryocooler, the limitations of classical PID controller, the theory and feasibility of arranging the transient process. The result of computer simulation and hardware verification indicate that the settling time is cut to 56% and the overshoot is optimized to 22% compared with the orignial system, as a consequence, the temperature-control performance of cryocooler is remarkably improved with the algorithm.