Simultaneous fuzzy observation and control

In this paper, we present a fuzzy observer based fuzzy control scheme for nonlinear processes. The observer and the controller are built by "fuzzily interconnecting" local linear Lu-enberger observers and linear controllers. The approach uses techniques of robust control along with piecewise quadratic lyapunov functions, to show the global stability of observer + controller + process. In this approach we do not require linearity of the process with respect to the inputs, generally assumed in "standard" nonlinear theory [11]. The separation principle¹ is shown to be satisfied. The approach is illustrated by an example.