Abstract: The sliding mode variable structure control is designed and applied to a class of complicated temperature object with nonlinear, large time delay and variable parameters. The traditional pole assignment formula is improved for the design of the sliding mode switching function. The feature of system output curve on the initial stage is extracted and expressed as binary linear regression equation, and which is used to design the control law to be mostly suitable for the actual object. Through a series of variable parameter simulation, the results show that the design scheme is validity and superior to the traditional simplex sliding mode variable structure control design, and the system is of great dynamic and static performances.

Key words:  sliding mode, improvement, control law, pole assignment