汽车点火系统工作时产生的电磁干扰具有能量大，频带宽等特点，被认为是汽车电磁兼容最主要的电磁干扰源。笔者提出了一种预测点火系统传导电磁干扰模型建立方法：建立系统中每个部件的电路模型，利用测量、解析法或有限元方法确定模型中的分布参数，集成为点火系统等效电路模型进行系统仿真计算。时域与频域实验测试结果证实了该模型的正确性与方法的可行性。

The ignition system in automobiles is a main source of electromagnetic interference (EMI), because the electromagnetic emission from the system has the characteristics of high-energy and wide-bandwidth. A method for EMI prediction based on its components’ circuit models is presented. First, the characteristics of the components are analyzed and the equivalent circuits are drew; then, the parasitic parameters of the electromagnetic device are extracted from measurement, analytical solution or finite element method (FEM); and finally, the circuit model of the whole ignition system model in high frequency condition is established. This model is verified by the measurement and simulation results in time domain and in frequency domain.

国家自然科学基金资助项目(50877081)