ABSTRACT
There have been a number of contributions to the
problem of fuzzy control considering the linguistic
controllers developed by Mamdani [1]. That approach was limited in its further extension to the
topics of control theory--stability, optimal control,
robustness--because of the lack of an explicit
relation between the control theory and the fuzzy
look-up table. For a fast system like the hydraulic
position servo (HPS) system, making the fuzzy look-up table is very difficult. It is more difficult to make the fuzzy logic controller (FLC) to be robust when the piston stroke is changed.