轿车点火系统电磁辐射仿真分析

Simulation analysis of electromagnetic radiation of car ignition system

为了降低整车的电磁辐射强度,对点火系统主要辐射部件采取了不同的辐射抑制措施。建立了实际模型,利用有限元多次加密网格法对模型进行仿真,根据实际电压和运行状态设置边界条件,绘出控制器和火花塞点火瞬间的电磁场图像。通过仿真图像分析出部件内部结构对电磁场的影响。通过电路设计等改进措施使电磁辐射强度降低了16dB,验证了设计方法的有效性,使点火系统达到了国家规定的车辆部件电磁辐射标准要求。

In order to reduce the intensity of electromagnetic radiation,different suppression measures are applied to the main electromagnetic radiation components of car ignition system.Actual size models of controller and spark plug are established.Simulation is carried out using Finite Element Method（FEM） with multilevel compressed grid methods.The boundary conditions are set according to actual voltage and operating status.The transient electromagnetic field images of the controller and spark plug in ignition are obtained.The impact of the internal structure of the components on the electromagnetic field is analyzed.Improving measures are taken on the designs of circuit and component internal structures,by which the intensity of the electromagnetic radiation is reduced by 16dB.The effectiveness of the design method is verified,which satisfies the state standard of electromagnetic radiation of vehicle components.