By combining self-tuning controller with Smith-predictor, a multivariable pole assignment
self-tuning Smith controller is proposed for industrial processes with long time delay. The
proposed controller not only can predict the process output and adapt to the control of non-minimum
phase system but also has an asymptotic servo property. Its structure is simple. The
algorithm has been used to control a group of cover annealing furnaces with microcomputer
in an iron and steel company. The control accuracy and temperature distribution nonuni-fortuity
in the annealing furnace are within ±3°C.