电动助力转向系统的回正与主动阻尼控制策略研究

针对配备电动助力转向系统的车辆低速时回正性差,而中高速时又容易出现回正超调的现象,提出了一种新型的回正与主动阻尼控制策略。该控制策略以功能原理为理论基础,可以随车速和转向盘转角的不同而调整回正力矩或阻尼力矩的大小。实车试验的结果证明,该控制策略能够改善车辆低速时的回正性,抑制车辆中高速时的回正超调现象,并且在施加了回正与主动阻尼控制后,驾驶员的操纵手感没有受到不良的影响。     

What is the market potential of plug-in electric vehicles as commercial passenger cars? A case study from Germany

Commercial passenger cars are a possible early market segment for plug-in electric vehicles (PEVs). Compared to privately owned vehicles, the commercial vehicle segment is characterized by higher mileage and a higher share of vehicle sales in Germany. To this point, there are only few studies which analyze the commercial passenger car sector and arrive at contradictory results due to insufficient driving profile data with an observation period of only one day. Here, we calculate the market potential of PEVs for the German commercial passenger car sector by determining the technical and economical potential for PEVs in 2020 from multi-day driving profiles. We find that commercial vehicles are better suited for PEVs than private ones since they show higher average annual mileage and drive more regularly. About 87% of the analyzed three-week vehicle profiles can technically be fulfilled by battery electric vehicles (BEVs) with an electric driving range of about 110 km while plug-in hybrid electric vehicles (PHEVs) with an electric range of 40 km could obtain an electric driving share of 60% on average. In moderate energy price scenarios, PEVs can reach a market share of 2–4% in the German commercial passenger car sales by 2020 and especially the large commercial branches (Trade, Manufacturing, Administrative services and Other services) are important. However, our analysis shows a high sensitivity of results to energy and battery prices as well as electric consumptions.     

The influence of e-carsharing schemes on electric vehicle adoption and carbon emissions: An emerging economy study

Moving toward sustainable mobility, the sharing economy business model emerges as a prominent practice that can contribute to the transition to sustainability. Using a system dynamics modeling approach, this paper investigates the impacts of an e-carsharing scheme in carbon emissions and in electric vehicle adoption. We study the VAMO scheme located in Fortaleza, Brazil, as the first e-carsharing scheme in the country. We study two policies combined: a VAMO planned growth policy and a retirement policy for conventional vehicles. Our results show that the VAMO incentive policy is an important factor to reduce emissions and to increase awareness of electric vehicles, highlighting the role of the government as an institutional entrepreneur, stimulating and sustaining the VAMO scheme. The retirement policy in combination with the VAMO incentive policy obtained the best results in our simulations, reducing 29% of CO₂ emissions and increasing 36% electric vehicle adoption, when compared to the business-as-usual scenario. The main conclusions are that such e-carsharing schemes offer direct and indirect benefits to urban mobility (specially to electric vehicle adoption) and that they depend on how the government supports them.     

船舶电力系统建模

分析研究船舶电力系统的安全性可以运用系统故障仿真手段，但必须对船舶电力系统精确的数学模型进行建模。从某大型集装箱船舶电力系统的工作原理出发，根据柴油发电机组的动态特性，研究了船舶电力系统模型的结构和原理，建立了船舶电力系统模型，该系统可以仿真船舶电力系统的许多运行工况。给出了发电机组正常起动过程和滑油泵、侧推器先后起动时滑油泵电缆发生三相接地故障的仿真过程，对电力系统的参数整定和安全策略的选取有一定的参考价值。     

动力分散型电动车组车载微机网络的功能划分与接口设想

从车载微机网络的拓扑结构、网络组成单元及功能划分、接口与控制逻辑、故障处理几个方面提出了动力分散型电动车组车载微机网络的功能划分与接口设想。     

120km/h交流货运电力机车轮盘制动单元研制

介绍了用于 12 0km/h交流货运电力机车轮盘制动单元结构、作用性能 ,重点论述了轮盘制动单元研究、设计、试验等内容。     

便携式多通道光电传感器测试记录装置

针对目前机车上大量使用光电速度传感器的现象,文章介绍了一种便携式多通道光电速度传感器检测记录装置,很好地解决了因光栅堵塞、变形、电子模块损坏等因素造成传感器速度瞬态中断及其它一些非功能性的故障,满足了现场检测的需要。     

高速列车制动计算中值得关注的问题

1998年颁布实施的《列车牵引计算规程》已法定采用单位重力的作用力N/kN作为单位力(列车阻力或牵引力或制动力)的单位,我国高速列车制动计算中单位力的单位必须统一到法定单位上来,并采用由此建立的一系列计算公式;同时指出高速动车组的制动计算绝不能忽视回转质量系数,均牵式(动力分散式)高速列车的回转质量系数大于推挽式(动力集中式);此外,还对制动粘着系数、列车基本阻力等制动计算参数的试验公式实用化问题作了论述。     

总线与以太网技术在船闸控制系统中的应用

总线与以太网技术已成为目前国内、外控制系统设计中正在兴起的主流控制技术。本文详细介绍了基本Interbus总线、光纤以太网、PLC和组态软件的船闸控制系统的设计,给出了控制系统的网络结构、中央控制单元、现地控制单元的构成及实现的功能,同时介绍了船闸控制系统的安全措施设计。     

MVB网络接口单元的FPGA实现

介绍了列车通信网和多功能车厢总线(MVB),分析了国外先进的MVB网卡通信机制与特点,在此基础上,提出了一种主动式MVB网卡的FPGA实现方法,并采用了功能相关的模块分组验证方法,对MVB系统进行功能验证及时序验证。