Research on the Fuzzy Sliding-Mode Control for the Electro-Pneumatic Proportional System

The paper introduces the control method of the fuzzy sliding-mode control (FSMC) for electro-pneumatic proportional position system, designs the discrete FSMC system and its controller. The sliding surface and its switch function are designed by using the pole assignment method. The control law of the sliding mode is based on the exponential trending law. The switch function s(k) and its error ds(k) are the two inputs of the fuzzy control system, while the gain parameter p of the symbol function and the speed reaching parameter q in the exponential trending law are the two outputs of the fuzzy control system. According to above process the controller can be designed. The theoretical analysis and the simulation indicate that the system achieves both good stability and good dynamic quality. The fuzzy control can soften the control output signal of SMC, and the system has good robust performance.