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Advances in Fuzzy Systems
Volume 2012, Article ID 217068, 8 pages
Research Article

A Hybrid PID-Fuzzy Control for Linear SISO Systems with Variant Communication Delays

Department of Automatic Control and Systems Engineering, University Politehnica of Bucharest, 060042 Bucharest, Romania

Received 11 April 2012; Accepted 30 April 2012

Academic Editor: Salvatore Sessa

Copyright © 2012 Adrian-Bogdan Hanchevici et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We propose one networked control strategy for linear SISO systems affected by variant communication delays. The purpose of this approach is to adjust, by using the fuzzy logic, the command provided by the PID controller. The input for the fuzzy logic controller (FLC) is represented by the delay and the variation of delay, and the output is used to adapt the PID controller’s command to the new value of the communication delay which occurs in the network. Simulation and implementation results are presented. The results show performance improvement when using our control strategy. The authors present the implementation for an axis of a 3D crane, using the Ethernet/IP (TCP/IP) communication protocol.