浅谈新能源汽车故障检修现状及发展措施

近年来,为了解决能源危机问题,国家大力支持新能源汽车的研发和应用。现如今新能源汽车的普及率逐渐提高,这给汽车故障检修行业带来了很大的挑战。因此解决好新能源车辆的检修问题是发展新能源汽车的基本条件。文章就新能源汽车的常见故障进行了分析,将新能源车在发展过程中存在的问题挖掘出来,尤其是维修方面存在的短板,最后对新能源汽车检修的发展提出了几点建议,希望对新能源汽车行业的发展有一定的帮助。     

柴油机后盖板总成异响特性识别研究

针对某单缸柴油机在标定工况下正面产生异响问题,融合近场声压阵面法、同步压缩-交叉小波变换法及模态分析法的优势,识别其异响特性.首先,在标定工况下采用近场声压阵面法定位了导致异响的铸铁后盖板总成辐射部件;然后,采用同步压缩-交叉小波变换法提取了后盖板总成异响与其激励响应的时频相关特征,结合频响函数法获得了铸铁后盖板总成结构共振是导致异响的关键结论;在此基础上,再基于有限元计算模态分析法比较了铸铁与铸铝后盖板总成的约束模态特性,找到了导致铸铁后盖板结构共振异响的薄弱环节;最后,采取托架板与加强筋设计措施提高了薄弱结构刚度,避开了共振频率区间.     

Time-varying performance prediction and system identification of internal combustion engines

Design for life-time performance and proper maintenance measures are usually needed to prolong the mean-time-between-failures of complex equipments such as internal combustion engines. To reach this, it is important to obtain the information of time-varying system performance in design stage and to identify the structural change at each moment. So a multidisciplinary model based method is studied in this paper to unify the time-varying performance(TVP) prediction and system identification(SI) of equipments. The related multidisciplinary model in this paper should be not only precise to give simulation results but also sensitive to the variation of system parameters. So the varying history of system performance along with the structural change can be obtained from the model. Then the value of system parameters can be identified by seeking roots with given detected responding data and relationship between system responding data and system parameters. A case study on a low power gasoline engine shows that the method presented in this paper can provide useful information for the development and maintenance of complex equipments.