QQ客服 官方微博 反馈留言

题名	电动汽车总线通信系统电磁干扰特性研究; 电动汽车总线通信系统电磁干扰特性研究
作者	1吴振军,电工研究所
学位类别	博士
答辩日期	2009-05-31
授予单位	中国科学院电工研究所
导师	1王丽芳,电工研究所
关键词	总线通信系统 电磁干扰 多导体传输线 分段线性递归卷积法 时域有限差分法 CAN bus communication system electromagnetic interference multi-conductor transmission lines piece-wise linear recursive convolution finite difference time domain
其他题名	电动汽车总线通信系统电磁干扰特性研究
中文摘要	总线通信技术在电动汽车中的应用十分广泛，但电动汽车中引入的高压大功率驱动系统带来严重的电磁噪声，总线通信系统容易受到该噪声干扰，可能对车辆运行造成影响。因此研究电磁干扰对总线通信系统的影响具有重要意义。本文针对电动汽车总线通信系统的电磁干扰取得的主要研究成果如下： 采用时域有限差分法，对电动汽车中高压和低压系统不共地情形时的线间干扰（串扰）进行分析，给出该方法的迭代求解公式。 基于Pspice传输线模型仿真分析了理想导体面上干扰和被干扰导线不共地系统串扰随频率变化的特性，确定了影响串扰的主要因素，为电动汽车布线提供依据。 建立了总线通信系统的电磁干扰特性分析模型——包括总线介质的传输线模型及负载ECU单元的模型。基于双绞线结构的特殊性，提出了一种利用测量法获取传输线分布参数的方法。将ECU单元引入到总线通信系统电磁干扰模型中，对ECU单元的频变特性通过测量其频域阻抗，经矢量匹配法拟合后，得到以极点和留数表示的有理函数式模型，并可转化成电路模型，利于电路仿真。 提出了基于分段线性递归卷积法分析端接频变负载的方法。用分段线性递归卷积法推导出端口处电压和电流的关系，代入到时域有限差分法的分析公式中进行暂态分析。也可以把ECU单元的电路模型直接代入到Pspice传输线模型中进行时域仿真。数值仿真及实验结果验证了两种方法分析端接频变ECU单元总线通讯系统的有效性。 提出了基于分段线性递归卷积法分析频变分布参数传输线系统的方法。把分析频变负载和频变分布参数的分析方法相结合，得到能够分析同时具有频变分布参数及负载的总线通信系统的方法，仿真和实验结果验证了该方法的有效性。 CAN bus communication system is widely used in Electric Vehicles (EV) and it is susceptible to interference. High voltage and high power driven system has been introduced in EV and serious electromagnetics noise has been caused. So it is necessary to analyze the Electromagnetic susceptibility (EMS) of CAN bus system in EV. The EMI model and numerical methods are researched in this paper. The main innovative achievements are as follows: CAN bus communication system and high voltage system in EV have different grounding system. The finite difference-time domain method is used to analyze this kind of system in Electric Vehicle, and the corresponding iterative equations are derived. Based on the MTL model of Pspice, the crosstalk voltage is simulated in function with frequency and the main factors affecting the crosstalk have been determined. It provides evidence for wire harness layout in Electric vehicles. The EMI model of CAN bus communication system has been established which contains the transmission line model and ECU model. A simple method has been developed to measure the open circuit and short circuit impedances, and the distributed parameters of UTP(Unshielded Twisted pairs) can be calculated. Then the transmission line model can be established. The Electric Control unit (ECU) model has been introduced to predict EMI of CAN bus system. The frequency domain impedances of ECU are measured and fitted by Vector Fitting Method. A rational function can be obtained to simulate ECU and can be used to simulate the EMI by FDTD method. The ECU can also be modeled by circuit model from the rational function; it is convenient to use the circuit model for simulation in Pspice. A novel finite difference time domain (FDTD) method has been proposed to model Multiconductor Transmission lines (MTL) terminated in frequency dependent loads. Based on piecewise Linear Recursive Convolution (PLRC), the relation of voltage and current on the terminal can be gained to simulate transient process of Bus communication system in FDTD. By using the circuit model of ECU, it is convenient to simulate the transient process of CAN bus system by Pspice MTL model. Simulation and experiment results show that these two methods are effective to analyze CAN bus system terminated in frequency dependent ECU. A novel finite difference time domain (FDTD) is used to analyze the MTL with frequency dependent distributed parameters. The recursive formula to calculate voltages are deduced based on PLRC. Combining with the method for frequency dependent loads analyzing, the CAN bus communication system with frequency dependent parameters and loads can be analyzed. The validity of the method has been proved by the results of simulation and experiment.
语种	中文
公开日期	2010-10-18
页码	125
分类号	TM1;TM921
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/6814]
专题	电工研究所_其他部门_其他部门_博士学位论文
推荐引用方式 GB/T 7714	1吴振军,电工研究所. 电动汽车总线通信系统电磁干扰特性研究, 电动汽车总线通信系统电磁干扰特性研究[D]. 中国科学院电工研究所. 2009.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。