摘要
介绍了电动助力转向系统(Electric Power Steering,EPS)的工作原理及控制器(Electric Control Unit,ECU)的构成和关键技术。建立了控制器的有限元热分析模型与边界条件,根据基本传热原理,计算出在室温时ECU的温度分布。为了提高ECU的散热能力并得到更合理的ECU结构布局,分别考察了ECU散热机构在室温工作时,同一节点在不同结构参数时的温度值。综合以上分析结果,考虑降低PCB板与ECU芯片的工作温度与加工成本、空间布局等情况,设计了最优的ECU散热结构,分析优化后的节点温度,比最初的温度降低了3℃,从而大大提高了ECU的散热能力,提高了其工作可靠性。
The working principle of Electric Power Steering （EPS） and as well as the configuration and key technology of ECU was Introduced. The ECU thermal FEA model and boundary condition was established, and ECU temperature distribution at room temperature was concluded according to basic heat exchange theory. Different temperature values at the same node for different structure parameters in working status was investigated in order to raise ECU thermal distribution capacity. The optimized ECU radiating struc- ture has been designed by considering conditions as reducing operating temperature, manufacturing cost, space distribution and etc. of PCB and ECU chip. After analyzing the optimized node tempera- ture, it has been found that the node temperature decreases by 3 ℃ than its initial temperature. Therefore, the optimized structure has significantly raised the thermal radiating capacity and operation reliability of ECU.
出处
《机械设计》
CSCD
北大核心
2012年第12期54-57,共4页
Journal of Machine Design
