Variable structure control applied to chemical processes with inverse response

This article proposes the use of a sliding mode controller based on a first-order-plus-deadtime model of the system for controlling higher-order chemical processes with inverse response. The controller has a simple and fixed structure with a set of tuning equations as a function of the characteristic parameters of the first order-plus-deadtime model. The controller performance was judged via computer simulations using linear and nonlinear models of chemical processes with inverse response.