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Online global learning in direct fuzzy controllers

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6 Author(s)
Pomares, H. ; Dept. of Comput. Archit. & Comput. Technol., Univ. of Granada, Spain ; Rojas, I. ; Gonzalez, J. ; Damas, M.
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A novel approach to achieve real-time global learning in fuzzy controllers is proposed. Both the rule consequents and the membership functions defined in the premises of the fuzzy rules are tuned using a one-step algorithm, which is capable of controlling nonlinear plants with no prior offline training. Direct control is achieved by means of two auxiliary systems: The first one is responsible for adapting the consequents of the main controller's rules to minimize the error arising at the plant output, while the second auxiliary system compiles real input-output data obtained from the plant. The system then learns in real time from these data taking into account, not the current state of the plant but rather the global identification performed. Simulation results show that this approach leads to an enhanced control policy thanks to the global learning performed, avoiding overfitting.

Published in:

Fuzzy Systems, IEEE Transactions on  (Volume:12 ,  Issue: 2 )

Date of Publication:

April 2004

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