Abstract:The response of the high-speed solenoid valve, which is inside the EUI for a small heavy-fuel engine, is analyzed. The corresponding mathematical model is set up based on the circuit equation, the magnetic circuit equation and the dynamic equation. It is simulated by means of the SIMULINK tools in MATLAB environment. By comparing different results simulated in variable parameters and analyzing the main factors affecting the dynamic response, the final parameters are determined, even the stability and rapid response of the solenoid are gained. The simulation model which is considered the reluctance change of the core material is valuable for further research and development of the solenoid valve.