Fuzzy PID control design of electronic yarn let-off system on warp knitting machine

In view of the electronic yarn let-off system response lag and obvious stripe when high-speed switching during warp knitting,a kind of fuzzy PID algorithm for the electronic yarn let-off system is developed by combining fuzzy control with common PID control.The real-time correcting of the warp beam motor running speed is carried out through the fuzzy PID technology,so that the PID parameters of yarn let-off system are adjusted online.Therefore,the system’s dynamic performance is greatly improved.By use of MatLab,PID control and fuzzy PID control are simulated,and their results are compared.When compared with common PID control,the fuzzy PID control can effectively raise the response speed of warp beam motor,reduce overshoot and steady-state errors,and optimize the overall performance of the electronic yarn let-off system.