信号控制交叉口绿灯间隔时间计算的研究

针对信号控制交叉口由于绿灯间隔时间设置不当而可能导致的困境区域问题,结合路口限速、交叉口几何条件等客观因素,提出分析模型和最小绿灯间隔时间的计算公式,同时针对几种可能出现的情况,提出相关的建议,以达到消除困境区域的目的。     

振动减速带的速度控制效果研究

车速是影响道路交通安全的一个重要因素,提高速度控制技术的功效,对于改善道路安全性具有重要的意义。文章通过对振动减速带的车辆速度进行观测和分析,评价了速度控制设施的减速效果。     

Effect of a speed reduction of containerships in response to higher energy costs in Sulphur Emission Control Areas

The objective of this paper is to explore the possible consequences of the future low-sulphur fuel requirements in Sulphur Emission Control Areas (SECA) on vessel speed, from the standpoint of the container shipping industry. Rational energy use, speed reduction, and revenues are closely related in the container shipping sector because speed reductions may provide substantial energy and cost savings. The operators could consider reducing their speed in SECA in order to save on fuel that will become relatively expensive. However, to maintain a weekly frequency without adding new ships, such a behaviour implies that the required speed at sea outside the SECA area increases. This paper aims to investigate if such a difference in speed is cost-effective, and if the increase in speed outside SECA may result in an increase in CO₂ emissions of the total cycle. We propose a cost model that estimates the cost-minimising combination of speeds inside and outside SECA, and the resulting CO₂ emissions of the liner service. Applying this model to representative liner services serving North Europe, we find that differentiating speed accordingly slightly decreases total costs and increases CO₂ emissions in a similar way. The results are sensitive to the price of low-sulphur fuels, the part of the cycle in SECA and the number of ships deployed in the service.     

开创中国客车行业的品牌时代

21世纪是一个品牌竞争的时代。品牌已经成为企业竞争力的重要体现。本文分析了客车行业品牌建设的现状,并提出客车企业加强品牌的建议。     

基于PARETO最优解的重型汽车传动系速比优化

针对某重型汽车动力传动系统匹配设计中遇到的参数反求问题,提出了基于PARETO最优解的重型汽车传动系统参数优化方法.建立了某算例车型的CRUISE仿真模型的近似模型,并将其作为多目标优化的代理模型.利用Matlab遗传算法工具箱对该优化问题进行了求解,得到了算例车型传动系参数的1组PARETO最优解集.结果表明,计算所得PARETO解集能为工程人员提供多种可选方案,方便其选择合适的传动系统参数.     

金属带式CVT速比控制的仿真与试验研究

针对装备金属带式无级变速器(CVT)的整车,建立了无级变速传动系统数学模型.以无级变速汽车动力性和经济性相协调为目标,设计了Fuzzy-PI复合速比控制器.采用Fuzzy-PD控制策略和Fuzzy-PI复合控制策略对汽车起动工况进行了仿真分析,对装备金属带式CVT的某轿车进行了起动工况的模拟试验.结果表明,Fuzzy-PI复合控制策略优于Fuzzy-PD控制策略,速比的试验结果与理论数据一致,说明所建模型合理.     

公交电动汽车运行智能管理系统

为了能够实时远程监控公交电动汽车的运行状况,使得车辆安全可靠的运行,本文研究了公交电汽车运行智能管理系统的设计与实现。给出了系统的总体结构,系统主要由信息控制服务器系统、实时监控系统、统计分析系统以及车载信息采集与传输终端构成。重点讨论了各系统的功能设计,并且介绍了实现地理信息系统和无线通信功能的关键技术。实验结果表明,系统工作稳定可靠,提高了对公交电动汽车运行管理的效率。     

广西高等级公路限速控制技术研究

文章针对目前广西高等级公路限速过低的问题,结合广西交通科技项目《广西高等级公路设计速度与运行速度控制研究》所取得的研究成果,阐述了高等级公路限速控制应遵循的原则、限速值确定方法和限速方案,并对广西路网工程限速控制设计提出了建议。     

Development of driving cycles for electric vehicles in the context of the city of Florence

Strong efforts are spent in automotive engineering for the creation of so called Driving Cycles (DCs). Vehicle DC development has been a topic under research over the last thirty years, since it is a key activity both from an authority and from an industrial research point of view. Considering the innovative characteristics of Electric Vehicles (EVs) and their diffusion on certain contexts (e.g. city centers), the demand for tailored cycles arises. A proposal for driving data analysis and synthesis has been developed through the review and the selection of known literature experiences, having as a goal the application on a EVs focused case study. The measurement campaign has been conducted in the city of Florence, which includes limited traffic areas accessible to EVs. A fleet of EVs has been monitored through a non-invasive data logging system. After data acquisition, time-speed data series have been processed for filtering and grouping. The main product of the activity is a set of DCs obtained by pseudo-randomized selection of original data. The similarity of synthetic DCs to acquired data has been verified through the validation of cycle parameters. Finally, the new DCs and a selection of existing ones are compared on the basis of relevant kinematic parameters and expected energy consumption. The method followed for the creation of DCs has been implemented in a software package. It can be used to generate cycles and, under certain boundary conditions, to get a filtered access to the measured data and provide integration within simulation environment.     

浅谈农村公路桥梁养护与管理对策

文章总结了＂十一五＂期间广西岑溪市农村公路建设取得的成绩,分析了当前岑溪市农村公路桥梁养护与管理的现状及存在问题,提出了＂十二五＂期间岑溪市农村公路桥梁养护与管理的相关对策。