Abstract
Pneumatic control valve is a nonlinear electromechanical system with the mechanics, electronics, pneumatics and hydraulics, there is a totally different working mode of aeration and exhaust in any working point, which has typical nonlinear characteristics. Based on the established nonlinear dynamic mechanism model of the pneumatic control valve, the gain and time constant of diffident working point, dead zone and backlash in the rising and falling process and other nonlinear characteristics of the mechanism model are studied and analyzed in this paper through the qualitative analysis and quantitive calculation, which lays the foundation for the research of modeling, control and fault diagnosis.
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