基于混合建模方法的车用比例电磁阀热效应影响分析

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.