Abstract: The immune response, whose self-conditioned characteristic can be referred by controller design, is an important method to maintain the immune balance inside body. Based on immune feedback and classical PID controlling theory, an immune PID controller, using adaline network as antibody-suppressed function to improve the self-adapting capability, is developed. The good performance of immune PID is verified by the application of hydraulic edger screwdown system in Baosteel 2050 rough mill. The results show that the immune PID controller achieves better performance than the classic one, especially, in the circumstance of foreign disturbance and working condition variation.

Key words: Hot rolling, Hydraulic edger screwdown, Hydraulic servo system, Immune PID controller