电控汽油喷射发动机瞬态过程空燃比控制

在发动机台架上对EQ491i电控汽油喷射发动机的加、减载瞬态过程的空燃比进行了测量 ,对引起瞬态过程空燃比变化的原因进行了分析 ,并通过试验研究了相应的修正控制项对空燃比的影响。研究结果表明 ,以线性表格为基础的修正方式不能完全控制瞬态过程空燃比的偏移 ,初始阶段的空燃比偏移脉冲难以避免。     

Electric vehicles’ energy consumption measurement and estimation

Use of electric vehicles (EVs) has been viewed by many as a way to significantly reduce oil dependence, operate vehicles more efficiently, and reduce carbon emissions. Due to the potential benefits of EVs, the federal and local governments have allocated considerable funding and taken a number of legislative and regulatory steps to promote EV deployment and adoption. With this momentum, it is not difficult to see that in the near future EVs could gain a significant market penetration, particularly in densely populated urban areas with systemic air quality problems. We will soon face one of the biggest challenges: how to improve efficiency for EV transportation system? This research takes the first step in tackling this challenge by addressing a fundamental issue, i.e. how to measure and estimate EVs’ energy consumption. In detail, this paper first presents a system which can collect in-use EV data and vehicle driving data. This system then has been installed in an EV conversion vehicle built in this research as a test vehicle. Approximately 5 months of EV data have been collected and these data have been used to analyze both EV performance and driver behaviors. The analysis shows that the EV is more efficient when driving on in-city routes than driving on freeway routes. Further investigation of this particular EV driver’s route choice behavior indicates that the EV user tries to balance the trade-off between travel time and energy consumption. Although more data are needed in order to generalize this finding, this observation could be important and might bring changes to the traffic assignment for future transportation system with a significant share of EVs. Additionally, this research analyzes the relationships among the EV’s power, the vehicle’s velocity, acceleration, and the roadway grade. Based on the analysis results, this paper further proposes an analytical EV power estimation model. The evaluation results using the test vehicle show that the proposed model can successfully estimate EV’s instantaneous power and trip energy consumption. Future research will focus on applying the proposed EV power estimation model to improve EVs’ energy efficiency.     

自动售检票系统对地铁运营的重要作用

AFC(自动售检票系统)在服务中与百姓接触比较直接.从天津地铁在运营实践中的体验和认识入手,从AFC系统与运营服务、运营管理、运营市场三个角度,论述 AFC系统对地铁运营所起到的重要作用,从而为拟通新线AFC系统的招标、设计,已通老线AFC系统的改造、升级,以及运营单位AFC系统的自主研发等提供参考建议.     

电子商务专业“22211”人才培养模式探究与实践

为进一步明确电子商务专业人才培养目标及规格,优化课程体系,完善教学内容的选取和序化,创新教学手段和教学方法,进一步改革考核和评价方式的改革等方面,切实加强电子商务专业内涵建设,基于校企合作,积极探索和实践“22211”人才培养模式改革。     

南京地铁自动售检票设备维修管理系统研究

针对现有自动售检票(AFC)设备维修管理系统存在的不足,提出了构建新的设备维修管理系统(AFC-EMS)的基本思路。剖析了AFC-EMS的系统架构及具体的实现功能。AFC-EMS根据AFC设备特性,以维修保养工单为走线,结合现有的无线射频识别(RFID)技术与状态维修管理理念,具有成本管理、计算机科学、维修理论等多专业综合理论研究集成性,并与运营一线维修保养实际结合,为现代化AFC设备维修管理提供技术支撑。     

汽车用新型智能电子搭铁开关

汽车用新型智能电子搭铁开关是针对现有电子搭铁开关的不足之处,提供的一种自动化程度高、适用性强的解决方案,本文详细阐述其结构及工作原理。     

筑路机械电器故障排除方法研究

我国目前的筑路机械包含有大量的电子设备,并且筑路机械设备的实际操作比较复杂,如果对筑路机械电器设备操作不当,将有可能引发电器接触不良、短路断线、漏电、功能失常等故障,由此导致筑路机械不能正常工作。针对筑路机械电器的故障,结合多年的实际工作经验,介绍几种排除筑路机械故障的方法,以供同行参考。     

2.4S电喷发动机怠速控制系统

详细阐述2.4S电喷发动机怠速控制系统的结构、应用和工作原理,并对其关键部件——步进电机的结构和工作原理作出相应介绍。     

并联型有源滤波器仿真研究

针对并联型有源滤波器提出了一种电流控制新方式,与传统控制方式不同,该方式不需要检测非线性负载中的谐波及无功电流.文章论述了并联型有源滤波器电流控制的等效原理,MATLAB仿真结果表明,省略了检测环节的该控制方法电路结构简单,大大简化了算法的研究,能够更加简单准确地补偿谐波电流,动态响应速度也很快.     

国际标准电子海图显示系统的关键开发技术研究

依据数字化海道测量数据传输标准和电子海图内容与显示规范,结合S-57数据解析和海图显示过程,以国际标准电子显示系统开发关键技术为研究重点,提出海图数据结构设计和海图快速显示方案,实现了国际标准电子海图显示系统的开发。