Intellectual PPF Control System In Rectifying Strip Steel Deviation

In this paper, the control system of rectifying strip steel deviation based on PPF control algorithm is designed, and a way of detecting the deviation signal of strip steel is introduced, Which adopted redundancy control that involves capacitance sensor and highfrequency photoelectricity sensor, and improved reliability of the system .The system includes: SIEMENS S7 200 programmabled logic controller, EM235 analog signal module expanded, TD200 for manipulating and displaying. The executing system pushes the roller by servocontrol device to rectify deviation.PPF control is named as Prediction Position Feedback control. This control method addopted the idea of prediction control, which can improve the predictioncapability of the system by regulating gain parameter, reset parameter and stroke parameter.Based on the sufficient analysis of PPF control rule, the research into the algorithm combination between fuzzy control and PPF control is made to develop the intellectual PPF control system and design automatic tracking system to the edge of strip steel by the step motor, the signal collecting circuit with the capacitance sensor ,servo magnifying circuit, and interface circuit are designed also.Industrial experiment show: Based on fuzzy PPF control, two types of signal detecting systems can entirely cooperate for fulfilling rectification, and improve the reliability of real-time control considerably.