Modeling, Simulation and Dynamic Identification of the Electro Hydraulic Proportional Valve

The paper presents a new method for experimental identification of the dynamic characteristics of the proportional electro-hydraulic servo valve which contains a position transducer attached to the spool. The new method can replace the traditional method of measuring the input signal and the flow of the valve by considering the displacement of the valve's spool as input for computing the Bode diagram. It combines the analytical model of the servo valve with the process of experimental identification in order to fully automate the procedure. The method was validated by direct measurement of the spool position for a chirp input signal. The experimental results are found in good agreement with the numerical simulation performed by AMESIM software.