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Hardware-Software Co-design of a Dynamically Reconfigurable FPGA-based Fuzzy Logic Controller

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3 Author(s)
Fons, F. ; Univ. Rovira i Virgili, Tarragona ; Fons, M. ; Canto, E.

Fuzzy logic has emerged as an efficient strategy to develop accurate nonlinear controllers. This work presents a novel design methodology of dual-input single-output fuzzy logic controllers in search of a cost-effective solution. For this, instead of synthesizing the classical three-stage fuzzification, rule inference and defuzzification units, a further stage is added inspired in modeling the resultant control surface: the whole nonlinear area is split in specific rectangular sectors and each of them is approximated by a second-order polynomial function. In this way, the hardware-software co-design of the fuzzy controller is reduced to a computer that for each input point (x,y) calculates its output z=f(x,y) according to the surface model of the particular sector that encloses this input point. The physical implementation of the fuzzy controller is based on a MCU-FPGA platform where the control surface is segmented, parameterized, stored through initialized SRAM memory and appended to the design bitstream as a simple and customizable data file. Moreover, the dynamically reconfigurable FPGA makes feasible to multiplex the silicon-based functionality at run-time while the sequential execution of the fuzzy algorithm is in progress.

Published in:

Electronics, Circuits and Systems, 2006. ICECS '06. 13th IEEE International Conference on

Date of Conference:

10-13 Dec. 2006