Abstract

This paper presents some simple fuzzy logic schemes for on-line tuning proportional - integral controller parameters to improve system robustness. It is show that with fuzzy tuning the reference response is well damped and the maximum deviation of the disturbance response is reduced even in the case of changing plant parameters. The fuzzy tuned controller can then be applied to multi-loop control system using the conventional cascade principles. Simulation result indicates that good performance can be achieved in presence of parameter and load variations, and backlash nonlinearity.