汽车点火系统电磁干扰的模拟仿真  

Simulation of an automobile ignition system electro magnetic interference

作　　者：李永明[1] 邓前锋[1] 俞集辉[1] 汪泉弟[1] 李旭[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：《重庆大学学报（自然科学版）》2008年第10期1149-1153,共5页Journal of Chongqing University

基　　金：重庆市自然科学基金重点资助项目(2006BA6015)

摘　　要：点火系统工作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;同时火花塞间隙击穿时的火花电流噪声对车内形成极强的辐射干扰。根据点火过程中初级电路和次级回路建立的电路模型,计算了点火线圈初级电压、电流在开关闭合到断开过程中的波形变化和次级回路的火花电流,并将高压导线等效为单极天线计算了在车内的辐射电场分布,比较了高压导线的工作频率和终端负载的影响。研究表明,采用阻尼导线和增大火花塞内电阻都可以有效抑制火花电磁噪声。When an ignition system operates, conducted interference caused by transient voltage of the primary circuit will impact on the accumulator and the disturbance will travel throughout the vehicle via wiring. The ignition system can disrupt the Electronic Control Unit and the normal operation of other electrical devices. Spark plug gap noise simultaneously produces very strong radiation interference in a vehicle. We analyzed the changes of the ignition coil voltage and current when an ignition switch was turned on and off. A discharged circuit model of spark plug also was set up. The electric field distribution in an automobile was calculated. For these calculations, the high-voltage wire was considered to be a unipole antenna. This simulation indicates that using either damped wire or adding spark plug resistance can suppress spark noise effectively.

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：U463.64[机械工程—车辆工程] TN03[交通运输工程—载运工具运用工程]