走近行业专家,聆听权威评点--客车行业专家眼中的客车大赛和中国客车业

7月27日,适逢第2届客车大赛组委会专家组对大赛申报金奖和最佳造型奖参赛车辆进行第2次评审。本刊记者对行业比较关心的热点问题向评委组的部分专家进行了采访。采访对象:李世豪(建设部科技委城市车辆专家委员会主任)记者:第5届北京国际商用车及零部件展览会和第2届客车大赛,作     

客车侧翻试验仿真研究

为检验某大型客牟上部结构强度性能,依照GB/T17578-1998《客车上部结构强度的规定》进行了客车实车侧翻试验,在此基础上应用ANSYS／LS—DYNA软件建立客车侧翻试验有限元模型并进行仿真。通过比较,仿真分析与实车试验得到的车身变形趋势基本一致,在数值上仿真结果略高于试验值,从而验证了有限元建模仿真结果的正确性。     

改革开放30年客车行业的5大进步

1978年到2008年,改革开放30年,我国客车行业从计划经济走向市场经济,从默默无闻到广受中外关注,不仅技术能力和产品品质得到本质的提升,而且正以惊人的速度展现出勃勃的发展生机。这种进步是改革开放之功,也是全体中国客车人的骄傲与光荣。综观我     

中国客车工业50年回顾专题(五)——中客公司的组建促进城市客车行业发展

随着中国经济体制改革的深入,1984年以后,中国城市客车制造工业在城市客车制造企业管理、经营方向、产品生产技术和产品开发的方面发生了巨大变化,进入了自新中国以来最为活跃的发展时期.     

浅议山东省城市化空间演化趋势对公路交通产生的影响

城市化发展理论是一种新兴的城市发展理论，山东省已经出台《“十五”及2010年城市化发展规划》，城市化的发展和城市化水平的提高势必影响社会的发展和人民生活的提高。着重讨论山东省城市化的发展对未来全省公路客货运输量的影响。     

安凯CNG全承载公交车,托起乌鲁木齐的蓝天——记乌鲁木齐公交珍宝巴士公司成立暨600辆安凯CNG公交车交付仪式

5月29日,乌鲁木齐公交珍宝巴士公司成立暨600辆安凯CNG公交车交付仪式在乌鲁木齐市政府前广场隆重举行。来自新疆自治区、乌鲁木齐市、建设部的领导,以及香港珍宝巴士董事局刘奕主席、江汽集团左延安董事长和全国数十家新闻媒体及乌鲁木齐市各界群众上千人共同见证了这个激动人     

客车出口需要务实而长远的战略规划

早在2005年初,面对我国客车争相出口的景象,曾有专家指出这繁荣背后存在4大出口困境:心态浮躁、恶性竞争、服务落后和缺乏战略.就在人们对我国客车出口前景充满期待和怀疑时,以宇通、金龙为代表的中国客车企业在2005年初以来出口市场的一系列举措,让人们重新树立了信心.中国客车业正在努力摆脱以往盲目和浮躁的做法,以脚踏实地的态度和长远的规划来突破出口困境,实施海外战略.     

Development of engine control using the in-cylinder pressure signal in a high speed direct injection diesel engine

Emission regulations are becoming more stringent and remain a principal issue for vehicle manufacturers. Many engine subsystems and control technologies have been introduced to meet the demands of these regulations. For diesel engines, combustion control is one of the most effective approaches for reducing not only engine exhaust emissions but also cylinder-by-cylinder variation. However, the high cost of pressure sensors and the complex engine head design for additional equipment present difficulties for manufacturers. In this paper, cylinder pressure-based engine control logic is introduced for a multi-cylinder high speed direct injection (HSDI) diesel engine. The time for 50% of the mass fraction to be burned (MFB50) and the IMEP are valuable for determining the combustion status. These two in-cylinder quantities are measured and applied to the engine control logic. Fuel injection timing is controlled to adjust the operating MFB50 to the target MFB50 using PID control logic, and the fuel injection quantity is controlled to adjust the measured IMEP to the desired IMEP. The control logic is demonstrated at steady state and during transient conditions and is applied to an NEDC mode test.     

Enhancement of aerodynamic performance through high pressure relief in the engine room for passenger car using cfd technique

High pressure acting on the vehicle’s body plays an important role in deciding the aerodynamic drag. An idea has been suggested to enhance the aerodynamic performance for small passenger car by relieving the high pressure in the engine room. The high pressure inside the engine room can be released to the outside of the vehicle through a hole perforated on the wheel house liner. About 1 % of the drag coefficient can be improved with the 1.88 % of the radiator air mass flow rate increment by installing the top hole with slots on the wheel house liner. Flow simulations are performed at the driving velocity of 110 km/h with the moving wall condition of the same velocity. The tire is rotating to catch more precise flow physics around a tire and wheelhouse liner.