Robust performance of fuzzy controllers based on differential sensitivity functions with decreasing increments

The design facilities of fuzzy controllers are completed by particular regions in the plane of controller parameters. In these regions, predetermined sensitivity limits of control system performance are guaranteed. Intended for complex plants with uncertain parameters, the results are the basis for suitable fuzzy-controller adjustment. The regions for predetermined performance sensitivity are obtained by computer-based simulation. In order to reduce the danger of skipping enclaves of instability, moving and decreasing increments in the searching parameter are taken into consideration