Analysis of Thermal Effect on Proportional Solenoid Valve Used in Vehicles Based on Hybrid Modeling

In order to tackle the problem that existing methods cannot accurately analyze and evaluate the influence of thermal effects on dynamic performance of proportional solenoid valves used in vehicles, a hybrid modeling analysis method based on multi-physics finite element method and system dynamics was proposed. Firstly, taking ambient temperature into account, based on heating and heat dissipation characteristics of electromagnets, a finite element model including electromagnetism, temperature, and structure was established to obtain accurate temperature field distribution and the change law of key parameters; then, electromagnet data and system dynamic equations were combined to establish a system dynamic model with temperature field considered. Finally, two types of dynamic characteristics were analyzed through experiments when there was no temperature rise and when there was a temperature rise. The research results show that: parameter changes caused by temperature field have a great influence on dynamic characteristics. When supply voltage is 8 V, the start-up time of solenoid valve is delayed by 2 ms, and the pressure building time is delayed by 3 ms. It is verified by experiments that this method can analyze the influence of thermal effects on the dynamic performance of solenoid valves.