PROPORTIONAL SOLENOID CONTROL PRESSURE RELIEF VALVE: PERFORMANCE STUDY THROUGH MODELLING, SIMULATION AND EXPERIMENT

Abstract

The dynamic characteristics of a proportional solenoid control single stage pressure relief valve is studied theoretically through modeling and simulation, supported by existing experimental result. Based on an existing model for the estimation of pressure loss coefficients the overall steady state pressure flow characteristics of the valve are determined. A detailed dynamic model has been developed and studied within the MATLAB-SIMULINK environment. The nonlinearities have been considered via the use of appropriate SIMULINK blocks. Detail valve geometry is considered in order to model the valve accurately. The solenoid is modelled as a nonlinear resistor/inductor combination. The spool valve assembly is modelled as a spring/mass/damper system with the consideration of inertia and damping effects. The inductance parameters are described as a function of displacement and current. The detailed modelling has resulted in a good comparison between simulation and measurement. The overall dynamic behaviour has been shown to be dominated by the solenoid characteristic relating force to applied voltage.