Why derivative action is used before fuzzy controller block in MATLAB Simulink?

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Suriyamoorthi Poornapushpakala

Generally input to Fuzzy is considered as error and rate of change of error. Hence to get the rate of change of error derivative block is added before fuzzy controller in SIMULINK

Diego Arcos-Aviles

You can go to the basis and read Chapter one and two of this book: K. Passino and S. Yurkovich, Fuzzy Control. Menlo Park, CA: Addisson-Wesley, 1998

Renann Baldovino

That's differential rate of error, d(error). You're using fuzzy control like a PD controller.

Youssef Harkouss

For the fuzzy controller, the information concerning the error is not sufficient to obtain the desired performance of the control system, and the fuzzy controller needs to have an information about the variation of this error to realize the desired performance