Implement of a Cascade Integral Sliding Mode Controller for a Water Tank Level Control System

In this paper, a cascade integral sliding mode control for a water tank level control system was proposed to realize level position regulating and tracking control. The key feature of this control scheme is use of cascade back-step design method for the cascade nonlinear water tank level system to improve the control performances. The validity of the proposed control scheme is verified through practical testing on an experimental tank level system device. In the cases of step, multi step, and sinusoidal level position command inputs, the test results show that the proposed control scheme is capable of improving the tracking precision.