一种有轨电车车载复合储能系统及其充放电策略

随着储能式有轨电车在越来越多城市应用,各方对车载储能的要求也越来越高,仅采用超级电容的车载储能系统难以满足发展需求.文章围绕提高车载储能系统性能问题,对基于超级电容和钛酸锂电池的车载复合储能系统进行研究,提出了一种配套的充放电策略,并结合黄埔有轨电车1号线的线路情况进行仿真分析验证.     

深圳市路内停车收费管理创新与实践

为提升路内停车秩序、促进道路交通运行效率提升,深圳市重新启动了路内停车收费管理工作。从实施目的、原则和策略三个方面,阐述深圳市路内停车收费管理的实施情况。路内停车收费费率定价遵循平衡路内外停车使用、制定合理比价关系,以及区域差别、分时差别的原则,建立了路内停车收费与动态交通运行联动的调节机制。管理模式层面,成立专门机构,通过取证权外派方式解决执法警力不足问题;收费技术层面,采用无纸化电子收费,避免利益冲突;执法方面,严格规范执法流程,对首次路内违法停车采取弹性执法。     

A 1.5 bit/s Pipelined Analog-to-Digital Converter Design with Independency of Capacitor Mismatch

A new technique which is named charge temporary storage technique (CTST) was presented to improve the linearity of a 1.5 bit/s pipelined analog-to-digital converter (ADC). The residual voltage was obtained from the sampling capacitor, and the other capacitor was just a temporary storage of charge. Then, the linearity produced by the mismatch of these capacitors was eliminated without adding extra capacitor error-averaging amplifiers. The simulation results confirmed the high linearity and low dissipation of pipelined ADCs implemented in CTST, so CTST was a new method to implement high resolution, small size ADCs.     

混合动力汽车油耗测试试验研究

介绍非外接充电型HEV的能量油耗测试及数据分析结果。油耗与其主电池的充放电情况呈现很强的相关性,若某次试验的充放电净值为充电,且充电量大,则该车试验的油耗相对较高。通过充放电净值来修正油耗,可以得到该HEV的修正后油耗值。对修正步骤加以一定补充,可得出更接近真实值的油耗值。     

基于铁路特许权经营的融资分析

文章对项目融资进行了实证分析,以我国铁路跨越式发展融资为研究基础,指出铁路发展的资金结构问题,并提出铁路和谐发展融资新理念,即推行特许权经营的项目融资方式.通过放宽市场准入限制,引入竞争,建立特许权经营的合资铁路制度,将可以为和谐铁路的发展节约大量的国家财政投资.这一结构性融资制度对我国铁路发展具有战略意义,为铁路中长期发展融资提供借鉴.     

车用锂离子电池的SOC估算方法研究现状

SOC(State of charge),即电池的荷电状态,它描述的是电池的剩余容量,其数值上表示为电池剩余的荷电量占电池总电量的比值,常用百分数表示。它是电池状态的一个关键指标,SOC的准确估算可以有效的提高电池使用效率,延长电池的使用寿命。荷电状态不能通过直接测量获得,而是需要其它方式来估算。本文对车用锂离子电池SOC估算方法进行了简单的描述,分析了不同方法的优缺点,最后进行了总结。     

隧道下穿密集居民区减震沉降控制技术研究

结合榆佳高速公路佳县隧道的工程特点及施工环境的复杂性,从一次齐发装药量、装药结构、掏槽形式及减振孔布置方案等角度,阐述了减震控制爆破的技术要点.根据分析,通过设置合理地延时爆破雷管段数及时间间隔,可有效减小洞室爆破对围岩及地表建筑物的震动强度,研究内容对相似工程爆破方案有一定参考价值.     

基于拥挤收费的交通诱导控制策略研究

在城市道路交通网络中,一个或少数几个关键路段或路口如果出现拥堵,会使路口失效,并且在级联失效的作用下交通拥堵会形成连锁效应向外部扩散,最终导致路网的大面积交通拥堵。提出一种控制级联失效的交通诱导策略,通过改进诱导阻抗函数指引出行者的路径选择,控制级联失效的传播,保障交通网络的可靠性。通过试验分析得出:基于拥挤收费的交通诱导控制可有效地控制大规模网络级联失效的发生。     

关于高速公路计重收费中逃漏通行费问题的对策

结合实际工作经验,对高速公路计重收费中遇到的逃漏通行费的问题进行分析,希望对从事机电系统管理和计重收费管理的有关人员有一定参考价值。     

Stochastic frontier analysis of excess access to mid-trip battery electric vehicle fast charging

This study aims to explore how factors including charging infrastructure and battery technology associate the way people currently charge their battery electric vehicles, as well as to explore whether good use of battery capacity can be encouraged. Using a stochastic frontier model applied to panel data obtained in a field trial on battery electric vehicle usage in Japan, the remaining charge when mid-trip fast charging begins is treated as a dependent variable. The estimation results obtained using four models, for commercial and private vehicles, respectively, on working and non-working days, show that remaining charge is associated with number of charging stations, familiarity with charging stations, usage of air-conditioning or heater, battery capacity, number of trips, Vehicle Miles of Travel, paid charging. However, the associated factors are not identical for the four models. In general, EVs with high-capacity batteries are initiated at higher remaining charge, and so are the mid-trip fast charging events in the latter period of this trial. The estimation results also show that there are great opportunities to encourage more efficient charging behavior. It appears that the stochastic frontier modeling method is an effective way to model the remaining charge at which fast-charging should be initiated, since it incorporates trip and vehicle characteristics into the estimation process to some extent.