Adaptive fuzzy anti-saturation tracking control for uncertain nonlinear systems with external disturbance. (English) Zbl 1537.93396
Summary: In this paper, a predictive-based adaptive anti-saturation tracking control scheme is designed for uncertain multiple-input and multiple-output (MIMO) nonlinear systems subject to input constraints and external disturbance. Taking the safety of the MIMO nonlinear systems into account, a safety saturation threshold, which is less than the physical device saturation threshold, is given. In addition, since all signals of the auxiliary systems are not immediately employed to the systems when the input saturation happens, a new predictive-based auxiliary system is designed. Furthermore, to estimate the compound disturbance, with the help of the fuzzy control technology, the nonlinear disturbance observer (NDO) is used. Then, the stability of the closed-loop systems is proved under the designed controller. Finally, a simulation example is given to illustrate the feasibility of the designed anti-saturation controller.
MSC:
| 93C40 | Adaptive control/observation systems |
| 93C42 | Fuzzy control/observation systems |
| 93C41 | Control/observation systems with incomplete information |
| 93C35 | Multivariable systems, multidimensional control systems |
| 93C10 | Nonlinear systems in control theory |
| 93C73 | Perturbations in control/observation systems |
| 93B53 | Observers |
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