城市常规公交线网的“一路一线”布局构想

合理的常规公交线网规划对于提高公交系统的服务水平和整体效率、优化城市交通结构具有非常重要的作用．本文将大中运量快速轨道交通系统催生出的“一路一线”制运用到常规公交线网布局中,首先基于公交线路功能分级,以“一路一线”常规公交断面客流为依据,提出城市常规公交线网的“一路二线”布局模式;接着阐述了常规公交“一路一线”线网布设方法的步骤;最后,结合“一路一线”特点,介绍了“一路一线”布局模式特点及其对公交线网布设载体要求和对高换乘率和低直达性的认识。     

公交停靠站车辆延误的调查分析与对策

本文以哈尔滨市典型非港湾式公交停靠站——市老年医院站点为例,对其车辆停靠延误进行了调查分析,并对其交通特性进行了分析。在介绍公交车停靠延误调查方法和数据处理的基础上,分析了延误的主要的影响因素及其相互关系;提出减少延误的方法和措施。     

厦门市高架快速公交系统建设实践

系统地介绍了厦门市高架BRT系统的建设实践,旨在为今后BRT系统的发展策略和建设模式提供经验借鉴。首先分析了厦门市BRT的建设背景,提出了BRT预留升级轨道交通的策略。然后,介绍了首期BRT系统三条线路的工程概况,详细阐述了BRT系统的六个组成部分,特别是中心区采取的高架为主的专有路权形式和功能齐全的车站。通过与轨道交通及其他地面BRT的综合比较分析,认为厦门市高架BRT系统具有较多优势,并取得了较好的运营效果,运输效率提高了2倍,运行速度提高了1倍。BRT在提高公交服务水平、缓解交通拥挤、引导城市发展方面发挥了良好的作用,是一种适合于厦门市目前发展阶段的建设模式。     

公交停靠站点车辆延误研究

针对公交停靠站点的车辆延误机理进行了分析,根据停靠站点的停车次数进行分类,确定出公交停靠站点车辆延误的计算公式,并通过实例进行验证,结果与实际情况基本相符合。     

济南市BRT车辆类型对比研究

优先发展公共交通是缓解拥堵的重要手段。快速公交（BRT）作为济南中运量系统的制式,其运输工具的性能对乘客出行时间、企业的运营效益具有重要意义。因此,对天然气车和现代无轨电车两种绿色公共交通车辆的性能进行介绍,从技术、经济、环境、社会影响和实施可行性几个方面进行对比,最后选择出合适的车辆类型作为济南市BRT的运载工具。     

基于FPGA液力传动内燃机车CAN通讯单元设计

开发设计了一种基于FPGA,能够对内燃机车发动机和变速箱的控制系统的行车数据、故障数据等稳定传输的CAN总线通讯电路.所设计的接口电路基于SAE J1939协议,由FPGA微处理器、CAN控制器等硬件电路以及软件设计组成.此方案可以大大节省CPU的开销,提高系统整体的工作效率,满足系统的高实时性和稳定性要求.     

Analysis of steering performance of differential coupling wheelset

In order to improve the curving performance of the conventional wheelset in sharp curves and resolve the steering ability problem of the independently rotating wheel in large radius curves and tangent lines, a differential cou- pling wheelset （DCW） was developed in this work. The DCW was composed of two independently rotating wheels （IRWs） coupled by a clutch-type limited slip differential. The differential contains a static pre-stress clutch, which could lock both sides of IRWs of the DCW to ensure a good steering performance in curves with large radius and tangent track. In contrast, the clutch could unlock the two IRWs of the DCW in a sharp curve to endue it with the characteristic of an IRW, so that the vehicles can go through the tight curve smoothly. To study the dynamic performance of the DCW, a multi-body dynamic model of single bogie with DCWs was established. The self-centering capability, hunting stability, and self-steering performance on a curved track were analyzed and then compared with those of the conventional wheelset and IRW. Finally, the effect of coupling parameters of the DCW on the dynamic performance was investigated.     

发动机制动、排气制动与缓行器联合作用的模糊控制系统研究

针对客车山区道路下坡行驶过程中对稳定车速的要求，对客车发动机制动、排气制动与缓行器联合作用时的制动模糊控制系统进行了设计和模拟分析。结果表明此控制系统可以保证汽车在不采用主制动器的条件下，利用发动机制动、排气制动与缓行器联合作用的持续制动方式，在各种坡度的坡道上以希望的车速稳定下坡行驶。     

国产通用型汽油机的排放现状及催化转化器的应用

中国通用小型汽油机的排放现状与美国现行的第二阶段排放限值相比有不小的差距,其中HC NOx排放超标居多;国产通用小型汽油机二、四冲程并存,且排放特点有显著的差异,在进行催化转化器应用时,要进行针对性设计。     

The Intermittent Bus Lane signals setting within an area

Intermittent Bus Lane (IBL) used for bus priority is a lane in which the status of a given section changes according to the presence or not of a bus in its spatial domain: when a bus is approaching such a section, the status of that lane is changed to BUS lane, and after the bus moves out of the section, it becomes a normal lane again, open to general traffic. Therefore when bus services are not so frequent, general traffic will not suffer much, and bus priority can still be obtained. This measure can be operating at a single city block, but if all related control parameters along bus lines are considered together, more time gains can be obtained. In this paper, the basic structure and operation of IBL around a single intersection are briefly introduced, then the construction of an objective function and its relationships with the related priority control parameters along one bus line and their simplifications are described. Finally the calculations of the priority control parameters when there are several connected bus lines within an area and some simulation results are discussed.