大功率发动机控制器壳体温度场仿真分析

Analysis on Influence of ECU Shell Temperature Field for Heavy-duty Engine

大功率元件过热损毁是导致控制器ECU失效的一个重要原因;文章分析了在自然对流散热情况下,元器件布置位置对控制器温度场的影响;首先,对控制器壳体进行了数值建模;其次,运用电子散热优化分析软件ANSYS Icepak对控制器密封外壳的温度场进行了仿真模拟计算;通过对比3种位置的模拟数据,其结果表明:元器件集中放置将会导致密封外壳整体温度较高,且不利于散热,这会导致ECU上大功率元器件在工作过程中因温度过高而损坏;将功率元器件分散放置靠近外壳的部位,温度场分布均匀,且高温范围小,散热效果较好;通过数值分析和模拟热分析,得出主要功率元器件放置位置对控制器ECU温度场的影响,为PCB板优化布置提供了设计依据,同时也会提高ECU的可靠性、增加ECU的使用寿命。

Over--temperature of heavy--duty components should be mainly responsible for ECU invalidation. Under the condition of natural convection, the influence of different arrangement of heavy--duty components on ECU temperature field was analyzed in this paper. Firstly, numerical model of ECU shell was established, and then the electronic radiator optimization analysis software ANSYS Icepak was used to simulate the ECU sealling shell temperature field. By contrasting the simulation data in three different places, the results indicate that= the components that are placed centrally will lead to higher overall seal shell temperature and it is not conducive to heat dissipation, which will damage the components because of overtemperature in the working process; the temperature field of components that are placed seperately near the shell part is uniformly distributed, the high temperature range is small, and the cooling effect is good. Through numercial analysis and heat simulation analysis, the influence of the position of heavy--duty components on the temperature field of ECU was acquired, which provide the design foundation for optimizing the place of the PCB. It can also improve the reliability of ECU, and increase its service life.