A Kind of Embedded Temperature Controller Based on Self-turning PID for Texturing Machine

摘要

Temperature control system (TCS) of texturing machine (TM) has many control channels, requires high control precision, and it is prone to be influenced by peripheral environmental factors. Since traditional temperature control method hardly realize ideal control effect, a kind of TCS realization method based on self-turning PID technology for constant temperature box (CTB) of TM was put forward based on the wide analysis of characteristics and methods of TCS. According to structure characteristic and working environment of TM-CTB, its discrete mathematics model was established by thermodynamics principle. The self-turning PID minimum phase control system for TM temperature controller was designed using pole points placement method, and its application instance was established by embedded system technology. System parameters were identified by recursion least square method, and forgetting factor was introduced to improve the model tracing ability of TCS. Experiments results showed that the method can satisfy the multi-channel requirement of texturing machine TCS, and its temperature control error can be limited under one percent.