低压电网抗谐波无功自动补偿装置的选择

谐波对电力系统的无功补偿装置将产生严重危害,为了确保低压无功自动补偿装置稳定、可靠地工作,文中应用非正弦电路无功功率的有关理论,对低压无功功率补偿装置的各种类型进行了比较,提出了配置低压无功自动补偿装置的步骤及其方法,最后给出一选择实例．该方法对低压电网无功补偿装置的升级改造具有重要的实际意义．     

嵌入式计算机系统在水下航行器的应用

针对小型水下航行器航行和工作特点,论述了采用嵌入式ＭＣＵ与ＥＤＳＰ器件和Ｉ＾２Ｃ总线技术构成的监测与控制系统。     

城市快速公交专用道道路线形设计分析

以汽车的动力特性和通过特性为理论依据,根据目前快速公交专用车辆大都采用低地板大型铰接底地板车辆的现状,结合其容量比一般普通公交大得多的特点,对快速公交专用道的道路线形设计进行分析,提出设计方法。     

纯电动客车在线诊断系统设计及应用

目前大部分纯电动客车生产时的整车性能调试依赖技术开发人员,非常不利于纯电动客车的批量生产。本文详述一种能够对纯电动客车进行快速调试和在线诊断的系统,有利于纯电动客车的批量生产。     

地铁通风小系统风机送电调试的探讨

通过6个案例分析,从不同调试故障的处理方法,归纳出3类常见调试问题,进而提出分3步进行的送电调试,为快速、高效地完成通风小系统风机送电调试任务提供了一条可行的便利途径。     

Design of safety-oriented control allocation strategies for overactuated electric vehicles

The new vehicle platforms for electric vehicles (EVs) that are becoming available are characterised by actuator redundancy, which makes it possible to jointly optimise different aspects of the vehicle motion. To do this, high-level control objectives are first specified and solved with appropriate control strategies. Then, the resulting virtual control action must be translated into actual actuator commands by a control allocation layer that takes care of computing the forces to be applied at the wheels. This step, in general, is quite demanding as far as computational complexity is considered. In this work, a safety-oriented approach to this problem is proposed. Specifically, a four-wheel steer EV with four in-wheel motors is considered, and the high-level motion controller is designed within a sliding mode framework with conditional integrators. For distributing the forces among the tyres, two control allocation approaches are investigated. The first, based on the extension of the cascading generalised inverse method, is computationally efficient but shows some limitations in dealing with unfeasible force values. To solve the problem, a second allocation algorithm is proposed, which relies on the linearisation of the tyre–road friction constraints. Extensive tests, carried out in the CarSim simulation environment, demonstrate the effectiveness of the proposed approach.     

基于安全检查表法的电动车安全分析和对策

对电动车的安全隐患进行了总结和评价,并在安全评价学中行之有效的安全检查表（SCL）方法上,结合该问题的发展历史及趋势,依据相关法律标准,提出了一些安全措施和防范对策。     

Multivariable speed synchronisation for a parallel hybrid electric vehicle drivetrain

In this article, a new drivetrain configuration of a parallel hybrid electric vehicle is considered and a novel model-based control design strategy is given. In particular, the control design covers the speed synchronisation task during a restart of the internal combustion engine. The proposed multivariable synchronisation strategy is based on feedforward and decoupled feedback controllers. The performance and the robustness properties of the closed-loop system are illustrated by nonlinear simulation results.     

船舶机舱电动往复机械的维护特点

通过对船舶机舱最常见的3种电动往复机械进行分析,得出电动往复机械维护管理的主要特点,并进一步弄清了3种电动往复机械的结构特点与工作原理。比较3种电动往复机械的维护特点,不仅对船舶机舱设备的日常维护管理起到一定的促进作用,还可以在一定程度上提高轮机管理人员的专业知识。     

Strategies to achieve deep reductions in metropolitan transportation GHG emissions: the case of Philadelphia

ABSTRACT

This paper investigates strategies that could achieve an 80% reduction in transportation emissions from current levels by 2050 in the City of Philadelphia. The baseline daily lifecycle emissions generated by road transportation in the Greater Philadelphia Region in 2012 were quantified using trip information from the 2012 Household Travel Survey (HTS). Emissions were projected to the year 2050 accounting for population growth and trends in vehicle technology for both the Greater Philadelphia Region and the City of Philadelphia. The impacts of vehicle technology and shifts in travel modes on greenhouse gas (GHG) emissions in 2050 were quantified using a scenario approach. The analysis of 12 different scenarios suggests that 80% reduction in emissions is technically feasible through a combination of active transportation, cleaner fuels for public transit vehicles, and a significant market penetration of battery-electric vehicles. The additional electricity demand associated with greater use of electric vehicles could amount to 10.8 TWh/year. The use of plug-in hybrid electric vehicles (PHEV) shows promising results due to high reductions in GHG emissions at a potentially manageable cost.