Adaptive controller for electro-hydraulic servo system with uncertain coefficients in control input

To design an accurate tracking control for the electro-hydraulic servo position system with uncertain coefficient in control input,an improved adaptive Backstepping controller design method is presented.By using the equivalent model transformation and selecting a proper Lyapunov function,the nesting problem caused by the mutual inclusion of parameter adaptive law and control input is effectively solved.This method is also applied to design a hydraulic drive servo system for a continuous cast mold and validate the stability.Simulation results show that the designed controller works with high robustness and desirable tracking performance.