Interval Type-2 Fuzzy Logic PID Controller Based on Phase and Margins Gains of the System Applied to a Non-Linear Control of a Conical Tank

This paper proposes a new algorithm for auto tuning of PID controllers whose gains are calculated through a self-tuning of the phase and gain margins for the closed-loop system using Interval Fuzzy Type-2 Logic with genetic auto-tuning of its membership functions. Simulations by using a nonlinear conical tank are presented with the objective of verifying the effectiveness of proposed control method. The results show that the presented strategy improves the controller performance for the conical tank.