Abstract: Iterative feedback tuning(IFT) control method, whose advantage is easy to implement, with excellent convergence, can tune the PID parameters. Based on IFT and classical PID controlling theory, an IFT-PID controller, which can self-tune the PID parameters online, is developed. The good perform- ance of IFT-PID is verified by the application of DC main driver system in Baosteel 2050 rough mill. The results show that the IFT-PID controller achieves better performance than the classic one, especially, in the circumstance of working condition variation.

Key words: Hot rolling, Iterative feedback tuning, Self-tuning controller DC main driver system