Switching of algorithms in the multiple models strategy by fuzzy logic through an Allen-Bradley PLC

Most of real processes operate in nonlinear behavior or multi operating conditions and from this point many studies are presented for the purpose of maintaining specific performances to controlled processes with nonlinear conditions and uncertainties. One of these studies is the multiple models strategy which is considered as a direct adaptive method. One of the important issues in this strategy is the switching between algorithms which may cause bumps “shocks” in the output response of the controlled variable. This paper describes one of practical solutions for the switching problem to avoid the shocks or bumps, by using fuzzy logic and implementing the software of the switch by means of the RSlogix 5000 software with an Allen-Bradley PLC.