Sliding-mode control of stable processes

The robustness of a controller to parameter variations or modeling errors is an important issue in process control. Sliding-mode control (SMC) is well-known for its property of being insensitive to parameter variations, modeling errors, and external disturbances. Hence, an appropriately designed SMC can be used to overcome the aforementioned weaknesses, which are unavoidable in practice. In this paper, a new sliding surface with four parameters has been introduced to achieve a satisfactory closed-loop system performance. Simulation examples are provided to show the value of the proposed SMC. Comparisons with an existing SMC method are also given to illustrate the superiority of the proposed SMC.