Sliding mode control algorithm and its implementation with coupled tank system

This paper demonstrates the design principles of sliding mode controller, which is implemented on a mathematically modeled real time coupled tank system. Simulations have confirmed the “robust” characteristics of the designed controller as the desired liquid levels have always been tracked, even in the presence of external disturbances. The output response is obtained by implementing the designed sliding mode control algorithm on the modeled plant and compared with that obtained by implementing PID control strategy on the same plant. The results are provided, from which, it is concluded that sliding mode controller is a better class of controller compared to conventional PID controller.