汽车点火系统电磁干扰的仿真研究  

Simulation of EMI for Automotive Ignition System

作　　者：李永明[1] 邓前锋[1] 俞集辉[1] 汪泉弟[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《计算机仿真》2009年第3期290-293,共4页Computer Simulation

基　　金：重庆市自然科学基金重点资助项目

摘　　要：点火系统作为车内最主要的电磁干扰源,点火时初级回路的瞬变电压引起的传导干扰将对蓄电池电压造成冲击,并通过导线干扰车内ECU和其它电子设备的正常工作,同时火花塞击穿时的高频火花噪声将对车内外的电磁环境造成极强的辐射干扰。为分析点火系统的电磁干扰特性,对点火过程中初级电路的瞬变电流和电压进行了仿真,并建立了次级回路火花塞放电等效电路模型,提出并计算了将高压导线等效为单极天线时车内的电场分布情况。研究表明,采用阻尼导线和增大火花塞内电阻都可以有效地抑制火花电磁噪声。Ignition system is the critical EMI （Electromagnetic interference） source in automobile, and the transient voltage in primary circuit loop attacks the accumulator and interferes with the ECU or other electronic devices by power cord, and simultaneously the high frequency spark noise caused by spark plug may produce radiated noise which affect the electromagnetic environment inside and outside the automobile. In order to analyse the electromagnet ic interference characteristic, the transient voltage and current in the primary circuit loop are simulated, and a discharging circuit model of spark plug is set up. The electric field distribution in automobile is calculated while the high - voltage wire is regard as monopole antenna. The study shows that both using damped wire or adding spark plug resistance could suppress the spark noise

关 键 词：汽车点火系统 电磁干扰 点火线圈 火花塞 高压导线 

分 类 号：O441.4[理学—电磁学]