The role of “hierarchy” in the design of fuzzy logic controllers

This paper investigates the role of hierarchy in the systematic approach to the design of fuzzy logic controllers (FLC´s). The key concept here is that the implementation of fuzzy engines at higher levels of the control hierarchy (where more reasoning is involved) yields more versatile fuzzy controllers with generally fewer control rules. At the same time, the structured nature of a hierarchical approach considerably simplifies the design procedure