Design and implementation of nonlinear internal model controller on the simulated model of pH process

In this paper, the authors have designed local internal model controllers on the basis of multiple-linear discrete transfer function models and the weighted sum of the output from the local internal model controllers (Non-linear Internal Model Controller) has been used to control the nonlinear process. The effectiveness of the proposed control schemes has been demonstrated on a pH process. From the extensive simulation studies, we have shown that the proposed non-linear internal model controller provides satisfactory servo as well as regulatory performances.