Abstract: A target value and a detailed prediction value of the first control index (T1CTref, T1CTprd) are used to calculate an FF water injection amount. Target values of first and second control indexes (T1CTref, T2CTref) and measured values of first and second control indexes (T1CTact, T2CTact) are used to calculate an FB water injection amount. Coolant injection amounts in an FF bank group (B1 to Bj) is controlled based on respective positions of segments constituting the steel plate, an initial water injection amount, and the FF water injection amount. Coolant injection amounts in an FB bank group (Bj+1 to BN) is controlled based on the respective positions of the segments, the initial water injection amount, and the FB water injection amount.

Abstract: In preset calculation, a plurality of cooling banks are set to be feedforward or feedback banks, and each of water injection amounts in these banks is calculated. In cooling history management, a recalculation position for re-executing the feedback calculation is set. In feedback calculation, a temperature correction value for compensating a delay due to a conveyance time period from a position of the feedback bank to a position of a delivery side pyrometer, and a response delay of the feedback bank is calculated, when a segment reaches the recalculation position. In the feedback calculation, each of water injection amounts in the feedback banks that is calculated in the preset calculation is changed for each of segments based on a delivery side temperature target value, a delivery side temperature actual value calculated for each of the segments, a delivery side temperature prediction value that is recalculated, and the temperature correction value.

Abstract: In preset calculation, a plurality of cooling banks are set to be feedforward or feedback banks, and each of water injection amounts in these banks is calculated. In cooling history management, a recalculation position for re-executing the feedback calculation is set. In feedback calculation, a temperature correction value for compensating a delay due to a conveyance time period from a position of the feedback bank to a position of a delivery side pyrometer, and a response delay of the feedback bank is calculated, when a segment reaches the recalculation position. In the feedback calculation, each of water injection amounts in the feedback banks that is calculated in the preset calculation is changed for each of segments based on a delivery side temperature target value, a delivery side temperature actual value calculated for each of the segments, a delivery side temperature prediction value that is recalculated, and the temperature correction value.