This paper deals with control of a pneumatic flow control valve with incompressible fluid power transmission. Using thermodynamics and fluidodynamics concepts a variable structure, highly nonlinear and coupled mathematical model is developed. Hence, a combined approach of adaptive and robust control technique (ARC) is presented and applied to the valve model in presence of parametric uncertainties (variations of pressure loads and hydraulic parameters) and uncertain nonlinearities (external disturbances and uncompensated friction forces). The Adaptive compensation is performed via feedback linearization based on online parameter estimation, while a robust variable structure controller (VSC) is implemented in addition to guarantee stability and good tracking performance.
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