CONTROL METHOD OF ROLLED PLATE THICKNESS OF STRIP

PURPOSE:To correct the inlet side plate thickness influence coefficient and controlled valuable influence coefficient and to control the plate thickness with high accuracy by applying a Kalman filter for the difference in the control data of a control time and the control data before the fixed control time. CONSTITUTION:The inlet side plate thickness influence coefficient to minimize the outlet side plate thickness deviation and control quantity influence coefficient are calculated by applying Kalman filter to these differences DELTAH1(K), DELTAU(K) and DELTAH(K) by finding the difference in the deviation DELTAh1(K) in the inlet side measured plate thickness against the inlet side reference plate thickness and the deviation DELTAh1(K-1) in the inlet side measured plate thickness before the fixed control period, the controlled valuable DELTAU(K) of the strip part which obtains the inlet side measured value and the difference DELTAH2(K) between the outlet side plate thickness deviation DELTAh2(K) against the target plate thickness of the strip part which gives the controlled valuable and the outlet side plate thickness deviation DELTAh2(K-1) before the fixed control period, both influence coefficients are corrected by the calculated value and the controlled valuable is determined by the corrected influence coefficient.