IN the domain of industry control, PID control is the basic algorithm, which has been used for a long time because of its simple structure, easy realization and many other virtues. For many simple control objects, PID control could easily achieve perfect effect, but for some complex object the effect is not so perfect. The submarine maneuver control system is a nonlinear six degree of freedom model, which has the great inertia variational parameters and many other complex characters. It is difficult for single PID to control the system because of the complex characters. In many instances, the best control is obtained in the manual mode using experienced operators. Fuzzy control translates the thinking of experienced operators into control algorithm, which has proven effective for complex, nonlinear, imprecisely-defined model. In order to advance the control effect, fuzzy theory is introduced and simulation experiments are carried out in this paper. The result shows that fuzzy PID control designed for the unstable nonlinear model of submarine maneuver respond more rapidly and robustly than single PID control.
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