Hydraulic bend control system research of fuzzy self-adaptive pid based on virtual instrument

Hydraulic bend control system, a kind of non-linear, close coupling complex electromechanical system, is an important ingredient of rolling shape control. Conventional PID process control is not good enough to meet the increasing precise, intelligent requests of complex electromechanical system. The combination of Intelligent and conventional control methods can solve this problem effectively. Applying virtual instrument to hydraulic bend control system of cold mill, this paper designs conventional PID and fuzzy self-adaptive PID controller, presents the solution of integral saturation problem on conventional PID, uses the fuzzy control rules to on-line adjust the parameters and realizes the optimal parameter modification. Through the practical test comparison of two control methods, it shows fuzzy self-adaptive PID control greatly improves the response speed and control precision of hydraulic bend control system.