Corrective feed-back control of the annealing process with utilization of the indirect measurement

In this contribution is described corrective feedback control of the steel roll´s annealing process based on behavior of inner temperature in the roll with utilization of indirect measurement system of the inner steel roll temperatures. Indirect measurement system of the inner temperatures indirect measures temperature inside the roll that is not measurable without destruction of the roll, from direct measured temperature of the atmosphere. Indirect measured temperature inside the roll in chosen place (coolest place in the roll) is as input to the algorithm of the corrective feed-back control. This control adjusts atmosphere temperature for next control step, based on error calculation between required inner temperature and indirect measured inner temperature.