Modelling the adoption intention and installation choice of an automotive after-market mild-solar-hybridization kit

Despite the recent commercial success of hybrid, plug-in hybrid and electric vehicles their market share is still insufficient to produce either a significant impact on energy consumption on a global basis or a profitable automotive segment. In this context, the possibility of upgrading conventional vehicles to hybrid electric vehicles is gaining increasing interest.To this aim this paper investigated and modelled the intention to install an after-market hybridization solar-kit (HySolarKit) in order to ascertain the main behavioural determinants of the choice process and set up an operational model with which to estimate the market potential of such technology. In particular, two behavioural stages of the choice process were analysed and modelled: (i) the intention to adopt the HySolarKit; (ii) the choice to install the HySolarKit. Both issues were addressed through ad hoc stated preference surveys carried out in two different Italian cities, and through the specification and the calibration of discrete choice models based on the behavioural paradigm of random utility theory. Different modelling solutions (homoscedastic and heteroscedastic) were compared in terms of goodness-of-fit and sensitivity to level-of-service attributes. The results showed the technological potential of the HySolarKit, and that both behavioural stages may be effectively modelled through random utility theory. Estimation results allowed an interpretation of the main determinants of the investigated phenomena, making it possible to quantify the potential effects and the concerns towards such a green solution, and making it possible to draw up operative marketing strategies. In particular, the intention to adopt the kit mainly depends on socio-economic factors as well as activity-related and attitudinal attributes, whereas the probability of installing the kit is greatly affected, to the same extent, by installation cost, the charging cost and the weekly mileage driven.     

客车骨架矩形管双面钻孔设备研制

简要介绍客车骨架用矩形管自动化钻孔设备的开发方案及结构设计,并通过小批量使用进行了验证.     

A structured flexible transit system for low demand areas

Public transit structure is traditionally designed to contain fixed bus routes and predetermined bus stations. This paper presents an alternative flexible-route transit system, in which each bus is allowed to travel across a predetermined area to serve passengers, while these bus service areas collectively form a hybrid “grand” structure that resembles hub-and-spoke and grid networks. We analyze the agency and user cost components of this proposed system in idealized square cities and seek the optimum network layout, service area of each bus, and bus headway, to minimize the total system cost. We compare the performance of the proposed transit system with those of comparable systems (e.g., fixed-route transit network and taxi service), and show how each system is advantageous under certain passenger demand levels. It is found out that under low-to-moderate demand levels, the proposed flexible-route system tends to have the lowest system cost.     

IdleStop and Go: a way to improve fuel economy

This paper proposes a mechanical solution to save fuel by shutting down an internal combustion engine whenever it is unnecessary for propulsion, e.g., when a vehicle is waiting for traffic lights. The engine and vehicle are restarted using the energy that is stored in a flywheel. Two additional clutches are needed to enable appropriate power flow from the flywheel to the engine and vehicle. This complicates the powertrain dynamics in that the number of degrees of freedom changes due to clutch operations. Therefore, a hybrid control strategy, which is treated as a top-level controller, is introduced to deal with this finite-state mechanical system. At the lower level, the engine and clutches are controlled in a coordinated manner such that the vehicle is launched according to the driver's demands. Using a comprehensive powertrain simulation package, the proposed controller is evaluated numerically.     

LWJ2000铁路信号微机监测系统

铁路信号控制系统是铁路行车重要的安全设备,由于缺乏理想的测试手段,只能依靠大量的人工检修测试以及维修人员的经验来检修,不能保证设备良好的运用状态,因此研制和配备一套完善的综合测试系统非常必要.LWJ2000型信号微机监测系统正是在此背景下研制的综合测试系统,可以为电务部门掌握设备的当前状态和事故分析提供科学的依据,同时,系统还具有逻辑判断功能,当信号设备工作偏离预定界限或出现异常时可以进行报警,避免因设备故障或违章操作影响列车运行.该系统已应用在北京铁路局管内300多个车站,取得了良好的运用效果.     

列车通信网络及其访问控制协议和选用原则

介绍列车通信网络的发展历程,主要的列车通信网络结构和功能,提出列车通信网络中合适的访问控制协议,结合我国具体情况,给出列车通信网络的选用原则.简要描述了列车通信网络的应用.     

基于CAN总线的柴油机控制系统

以机务段典型检修车间为例,应用CAN总线独特的优势,提出基于CAN总线的数据采集与监控系统,并对系统的总体体系结构、硬件接口电路设计和配置、软件设计及主体流程等分别进行说明,并应用FIX监控组态软件将复杂的实验站现场移植到PC机界面中,使得现场控制与操作站完全膈离,减少系统操作人员的工作量.     

铁路计算机联锁系统中通用输入输出接口研究

通过将计算机联锁系统中的输入输出接口从其它的执行模块中分离,可以使系统中各个模块的功能更加单一,更加专门化.提高整个系统的安全可靠性,也更有利于故障诊断及故障的排除.通过CAN总线组网,实现方便.输入模块采集设备状态上传给监测机,输出模块接收联锁机下发的执行命令,对现场设备进行控制.     

吊舱式混合电力推进系统综合性能评估

本文介绍对转桨吊舱推进器的结构特点,综合评估吊舱式混合电力推进系统（hybrid CRP podded propulsion）性能,得出其在机舱布置、燃油消耗量、投资成本等方面具有优良性能的结论。     

驼峰电子化控制系统中通信技术应用的研究

结合在驼峰电子化执行模块控制系统研发中的实际经验,介绍驼峰电子化控制系统中主控机与智能电子模块间通信方式的重要性,提出一种基于EPP协议的安全可靠、实时的通信方法.