车用交流发电机充电指示电路的改进设计

提出一种新结构的车用交流发电机充电指示线路,把电压型指示改进为电流型指示,从而根除了传统充电指示线路的弊端,更加可靠地指示交流发电机实际充电情况。     

Road pricing: An international perspective

This paper reviews experience with road pricing in Europe and Asia. It considers the objectives of road pricing, and demonstrates that differences in objectives lead to differences in scheme design and performance. It reviews the criteria for design of road pricing systems, and the development of charging structures and technologies to meet those criteria. In particular it discusses the relative merits of pre-determined and congestion-dependent charging structures, and of off-vehicle and on-vehicle charging systems. It assesses the performance of road pricing systems to date, discusses objections to road pricing and demonstrates that the role of road pricing within a wider transport strategy and the use made of the revenue generated, will be important determinants of public acceptability. Finally it assesses the relative merits of alternative approaches to implementation and argues that these will need to pay as much regard to public acceptability as to technical performance.     

智能道路无线充电系统耦合线圈互操作性分析

无线充电线圈的互操作性是智能道路无线充电系统的关键性能指标。为分析耦合线圈的互操作性，首先建立了无线充电系统及耦合线圈的仿真模型，选取了3种不同形状和对应尺寸的线圈作为发射线圈和接收线圈，利用COMSOL Multiphysics有限元仿真软件，分别分析了不同形状和尺寸以及不同组合形式线圈对无线电能传输系统效率和耦合线圈互操作性的影响。另外，采用MATLAB/Simulink对无线充电系统的传输效率进行了仿真分析。为验证仿真结果的准确性，对无线电能传输的试验装置进行了测试验证。研究结果表明：随着线圈传输间距的不断增加，线圈的自感不变而互感不断降低，同时其耦合系数和系统的输出效率也会随之减小；圆形线圈的互操作性优于方形线圈，其中方形-方形耦合线圈互操作性最差，圆形-圆形耦合线圈互操作性最优，其最大传输间距提升9%~12%；大尺寸线圈的互操作性优于小尺寸线圈，且线圈尺寸的变化对于互操作性的影响大于线圈形状。研究结果为智能道路无线充电系统设计提供了理论依据。     

高压二合一充放电模块整车辐射发射问题定位分析整改案例浅析

电动汽车车载充放电模块在运行过程中电磁兼容问题日益突出,本文主要对某款电动汽车进行GB 34660—2017整车辐射发射公告测试时,试验结果未通过国家标准要求,通过对干扰源的排查定位与分析研究,最后加入整改措施后,试验结果满足了公告测试要求,同时也为零部件供应商提供了针对性的优化方案。     

Dynamic charging infrastructure deployment for plug-in hybrid electric trucks

Inspired by the rapid development of charging-while-driving (CWD) technology, plans are ongoing in government agencies worldwide for the development of electrified road freight transportation systems through the deployment of dynamic charging lanes. This en route method for the charging of plug-in hybrid electric trucks is expected to supplement the more conventional charging technique, thus enabling significant reduction in fossil fuel consumption and pollutant emission from road freight transportation. In this study, we investigated the optimal deployment of dynamic charging lanes for plug-in hybrid electric trucks. First, we developed a multi-class multi-criteria user equilibrium model of the route choice behaviors of truck and passenger car drivers and the resultant equilibrium flow distributions. Considering that the developed user equilibrium model may have non-unique flow distributions, a robust deployment of dynamic charging lanes that optimizes the system performance under the worst-case flow distributions was targeted. The problem was formulated as a generalized semi-infinite min-max program, and a heuristic algorithm for solving it was proposed. This paper includes numerical examples that were used to demonstrate the application of the developed models and solution algorithms.     

Wireless charging in California: Range,recharge, and vehicle electrification

This research evaluated the potential for wireless dynamic charging (charging while moving) to address range and recharge issues of modern electric vehicles by considering travel to regional destinations in California. A 200-mile electric vehicle with a real range of 160 miles plus 40 miles reserve was assumed to be used by consumers in concert with static and dynamic charging as a strict substitute for gasoline vehicle travel. Different combinations of wireless charging power (20–120 kW) and vehicle range (100–300 miles) were evaluated. One of the results highlighted in the research indicated that travel between popular destinations could be accomplished with a 200-mile EV and a 40 kW dynamic wireless charging system at a cost of about $2.5 billion. System cost for a 200-mile EV could be reduced to less than $1 billion if wireless vehicle charging power levels were increased to 100 kW or greater. For vehicles consuming 138 kWh of dynamic energy per year on a 40 kW dynamic system, the capital cost of $2.5 billion plus yearly energy costs could be recouped over a 20-year period at an average cost to each vehicle owner of $512 per year at a volume of 300,000 vehicles or $168 per year at a volume of 1,000,000 vehicles. Cost comparisons of dynamic charging, increased battery capacity, and gasoline refueling were presented. Dynamic charging, coupled with strategic wayside static charging, was shown to be more cost effective to the consumer over a 10-year period than gasoline refueling at $2.50 or $4.00 per gallon. Notably, even at very low battery prices of $100 per kWh, the research showed that dynamic charging can be a more cost effective approach to extending range than increasing battery capacity.     

Numerical analysis of electric bus fast charging strategies for demand charge reduction

Electric transit buses have been recognized as an important alternative to diesel buses with many environmental benefits. Electric buses employing lithium titanate batteries can provide uninterrupted transit service thanks to their ability of fast charging. However, fast charging may result in high demand charges which will increase the fuel costs thereby limiting the electric bus market penetration. In this paper, we simulated daily charging patterns and demand charges of a fleet of electric buses in Tallahassee, Florida and identified an optimal charging strategy to minimize demand charges. It was found that by using a charging threshold of 60–64%, a $160,848 total saving in electricity cost can be achieved for a five electric bus fleet, comparing to a charging threshold of 0–28%. In addition, the impact of fleet sizes on the fuel cost was investigated. Fleets of 4 and 12 buses will achieve the lowest cost per mile driven when one fast charger is installed.     

浅析城市轨道交通信息网络系统的建设

阐述轨道交通行业中网络信息系统的建设思路，包括网络设计中的原则性问题，网络设计中各部分的组成。着重介绍了某项目的具体实施细节，以体现轨道交通信息网络设计中的注意点，并详细剖析网络各节点。     

采用触地布药方式实施水下抛石基床爆炸密实

通过大量的工程爆破实例,深入的水下爆炸机理分析以及触地布药方式在水下抛石基床爆炸密实优越性的讨论,充分表明采用触地布药方式实施爆炸密实的效果良好,操作简单可行,节约工程成本,并得到了业主、施工单位的肯定和好评     

收费广场水泥混凝土路面破坏原因及防治措施

水泥混凝土路面应从设计、施工入手，正确预测和综合估价其远景发展的需求，合理确定路面结构，确保施工质量，加强日常养护和管理，这样才能充分发挥良好的路用性能，延长使用寿命和建设周期。最大限度的提高社会服务水平和经济效益。