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Study on a kind of Variable Precision Controller based on the Exponential Rough Set

Applying the rough set theory makes the controlling quantity roughened, and realizes a variable precision control. The result of study reveals that the information of control system can be conserved by roughening the controlling quantity, the conversion from precision quantity set to smaller amount control rules can be achieved, the variable precision control can be realized by the means of equal relative error. From the simulation result check, it can be achieved that make the system moving more quickly than before by using the exponential rough set controller and the system performance can be satisfied at the same time. So that it is an effective method for nonlinear controller design.