SIMULATION OF A FUZZY-LOGIC CONTROL-SYSTEM

We review fuzzy-control principles and show a simulation program permitting convenient generation of membership functions and simple output in terpolation. Interactive simulation is more than ordinarily important for economical fuzzy-controller design, which must reduce the number of membership classes and input/ output rules as much as possible. We use a personal computer and interactive editing to compare linear and fuzzy servo controllers. With 50 per cent class-membership overlap {''pseudo dither''), our fuzzy logic produces linear interpolation, and thus completely unimpaired servo performance even if we use only 2 fuzzy sets (''positive'' and ''negative'') each for error and output rate.