互通立交入口匝道大型车加速车道长度研究

加速车道长度设计是否合理对车辆运行安全至关重要。为提高互通立交入口匝道加速车道长度设计的合理性及车辆运行的安全性,通过分析合流影响区车辆交通特性,基于修正的二阶爱尔朗车头时距分布模型,建立大型车在不同坡度（-2%≤i≤2%）、不同比功率（8~12 kW/t）下的加速车道长度计算模型,重点研究大型车在不同坡度、不同比功率下的加速车道长度。研究发现：坡度、比功率与加速车道长度均成正比。该研究可以为针对大型车的高速公路互通立交加速车道长度相关规范的修订提供参考。     

氮氧化物分析仪在柴油车排放污染物检测中的应用

本文主要介绍氮氧化物分析仪在柴油车排放检测中的应用,并分析对检验检测结果有影响的因素,通过分析使机动车检验检测机构进一步提高氮氧化物的检测结果准确性,确保排放结果更加真实有效.     

产业融合背景下的新能源汽车技术发展趋势研究

随着时代发和社会进步,人们对能源的消耗水平逐渐提升,世界上的能源数量逐渐降低,尤其是一些石油、煤矿类不可再生资源,消减速度非常快.在这样的背景下,人们对新能源的重视程度逐渐提升,新能源汽车逐渐成为一个重点研究项目.在科技不断发展的当前,新能源汽车技术有了较大程度发展,这让汽车行业逐渐迎来了一个新的发展契机,新能源汽车逐...     

北京地铁5号线车辆电传动系统

介绍了北京地铁5号线车辆的主要参数及其电传动系统的牵引/再生制动性能,阐述了主电路的组成、主要设备的参数及动作时序。对控制系统中的重要环节如牵引/再生制动指令的形成、脉冲模式、牵引/再生制动的控制、电流图形的启动和停止控制作了详细的描述。     

CTM-2002A汽车综合测试仪扩展功能的研发

通过开发软件扩展CTM-2002A汽车综合测试仪的数据处理功能，提高了汽车测试工作的效率。     

Real-time capable vehicle–trailer coupling by algorithms for differential-algebraic equations

The real-time simulation of vehicle trains requires an accurate and numerically feasible representation of the vehicle–trailer coupling. Although the equations of motion for the chassis instances can be reduced to systems of ordinary differential equations, additional constraints on the relative motion of vehicle and trailer are introduced when considering the hitch. In this article, we present a strategy for the simulation of vehicle–trailer combinations, where the algebraic constraints of the coupling are treated explicitly. Although this approach allows exact modeling of the respective joint geometry and realistic calculation of the coupling forces, a suitable numerical algorithm is required in order to solve the resulting differential-algebraic system of index 3 in real-time. The implementation in a commercial vehicle dynamics program is discussed and real-time simulation results are shown, which prove its feasibility for different coupling joints and demanding driving maneuvers.     

Feebates, footprints and highway safety

This paper presents an analysis of a market-based policy aimed at encouraging manufacturers to develop more fuel efficient vehicles without affecting the car buyer’s choice of vehicle size. A vehicle’s size is measured by its “footprint”, the product of track width and wheelbase. Traditional market-based policies to promote higher fuel economy, such as higher gasoline taxes or gas guzzler taxes, also induce motorists to purchase smaller vehicles. Whether or not such policies affect overall road safety remains controversial, however. Feebates, a continuous schedule of new vehicle taxes and rebates as a function of vehicle fuel consumption, can also be made a function of vehicle size, thus removing the incentive to buy a smaller vehicle. A feebate system based on a vehicle’s footprint creates the same incentive to adopt technology to improve fuel economy as simple feebate systems while removing any incentive for manufacturers or consumers to downsize vehicles.     

Computational model of conventional engine mounts for commercial vehicles: validation and application

In this paper, a computational model of conventional engine mounts for commercial vehicles comprising elastic, viscous and friction functional components, which expresses the nonlinear behaviour of the dynamic stiffness and damping of mounts as functions of both frequency and amplitude of excitation, is developed. Optimisation approach is implemented to identify model parameters using measurement data. The developed model has been validated against measurement data for harmonic excitations with a frequency range of 5–100 Hz and an amplitude range of 0.025–2 mm employing three different engine mounts used in heavy trucks. The model shows good and admissible agreement with measurement data keeping the tolerance of estimation below 11%. Simulations of engine vibration dynamics are presented with both proposed model and commonly applied Kelvin–Voigt model of the mounts. The developed model can be used in complete vehicle advanced dynamic analyses and also in the design of semi-active and active engine mounting systems for commercial vehicles.     

带有逆向物流的城市连锁店运输线路优化

逆向物流越来越受到人们的重视，结合节约里程法和启发式算法，对既有正向物流又有逆向物流的城市连锁商店物流配送的路线选择问题，以运输路线最优（即总运输费用最少）及运输车辆的合理利用为原则，进行优化设计。     

EMS型磁浮列车悬浮力分析

悬浮系统是磁浮列车的重要组成部分,其性能将直接影响车辆的性能。悬浮力是线路桥梁设计和车辆线路动力学分析的基础。根据EMS型磁浮列车的特点,给出了悬浮系统的数学模型,分析了悬浮力的大小及其动态特性。