Up to now, fuzzy controllers with only one input and one output of
the fuzzy system have been considered. The same arguments with
respect to the degrees of freedom of a fuzzy system are also valid
in the case of multiple inputs. A graphical representation of the
characteristic is not as easy as in the 2D cases of
section 17.2.2. Moreover, for the case
of two inputs, a 3D representation is possible. For a fuzzy
controller with a fuzzy system having two inputs 
and
and one output 
one gets a band of characteristics in a
2D discrete representation, or a 3D representation with the output
over the two inputs, as shown in Figure 17.12 for a
PD-type of fuzzy controller.
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A fuzzy controller is typically a classical controller using nonlinear characteristics. But the design and parametrisation is entirely different.
and
