基于PSAT的纯电动轿车动力系统设计和续驶里程研究

介绍了电动汽车动力驱动系统主要部件参数的设计方法,并从车辆动力学的角度建立了仿真模型.运用PSAT仿真软件对所设计系统进行了动力性和续驶里程的模拟计算,结果表明,所设计匹配的动力系统基本满足车辆的性能要求,验证了所建模型的正确性.分析了车重、车速和传动系效率时车辆续驶里程的影响,指出所设计的微型纯电动轿车最经济车速为35 km/h.该套方法对车辆开发初期进行动力系统设计具有现实指导意义.     

The need for building role models for motorcycle riders' education in the kingdom of Cambodia

In Cambodia, a rider's license is not required for motorcycles below 125?cc. and 73% of traffic accident fatalities among persons aged 15–19?years involve unlicensed riders. Motorcycle riding differs from automobile driving in that motorcycle riding reflects the rider's skill to a much greater degree, so unskilled riding is much more highly correlated with accidents. Going forward, in addition to gaining knowledge from traffic safety education, motorcycle riders should also learn basic specific motorcycle techniques. In particular, having riders learn and practice the three key tasks in motorcycle riding (breaking, leaning, and exiting) is effective at curbing the number of motorcycle accidents. In a new initiative aimed at improving riding skill, university students, instructors, and police officers were given practical riding instruction on a course using pylons. Program participants were able to learn riding techniques in an enjoyable setting, while seeing the potential for becoming motorcycle riding role models.     

高速电磁阀响应特性的研究

为实现电磁阀的高速响应的要求,提出了自行设计基于电容放电的驱动电路,通过仿真研究,确定驱动电路参数的取值范围.对电磁阀线圈结构参数对响应特性的影响进行了仿真与试验研究,仿真和试验结果的比较表明设计电磁阀具有较好的动态响应特性.     

Comparative evaluation of eight legislated driving schedules in terms of cycle metrics and emissions from a diesel-powered turbocharged van

The present work compares, on a fundamental basis, the performance and emissions of a diesel-engined large van running on eight legislated driving cycles, namely the European NEDC, the U.S. FTP-75, HFET, US06, LA-92 and NYCC, the Japanese JC08 and the Worldwide WLTC 3-2. It aims to identify differences and similarities between various influential driving cycles valid in the world, and correlate important cycle metrics with vehicle exhaust emissions. The results derive from a computational code based on an engine mapping approach, with experimentally derived correction coefficients applied to account for transient discrepancies; the code is coupled to a comprehensive vehicle model. Soot as well as nitrogen monoxide are the examined pollutants. Only the driving cycle schedule is under investigation in this work, and not the whole test procedure, in order to identify vehicle speed (transient) effects of the individual cycles only. The recently developed WLTC 3-2 is the cycle with a very broad and at the same time dense coverage of the vehicle’s/engine’s operating activity, being thus particularly representative of ‘average’ real-world driving. Even broader is the distribution of the US06, whereas particularly thin and narrow that of the modal NEDC. It is also revealed that the more transient cycles, e.g. the NYCC or the US06, are also the ones with the highest amount of engine-out pollutant emissions and energy consumption. Relative positive acceleration and stops per km are found to correlate very well with energy and fuel consumption and all emitted pollutants.     

某suv车型行驶跑偏问题的优化分析

行驶跑偏是指车辆在行驶过程中偏离了原来直线驾驶的状态,不仅会影响车辆的操纵稳定性和转向性能,更可能会危及乘客的人身安全。某SUV车型从设计到生产导入阶段,进行小批量投产时,出现大量车辆向左行驶跑偏现象,合格率约为60%。经过鱼骨图排查法的人、机、料、法、环等几个方面分析,列举出15种可能造成车辆行驶跑偏的因素。经过逐一排查,发现该SUV车型存在前副车架的控制臂安装支架尺寸超差,白车身的前、后副车架安装点尺寸控制不合理,前后悬模块装配一致性差及测试道路不规范等主要问题,以上四种问题造成的偏差趋势与实际该SUV车辆向左行驶跑偏现象相符,因此需要对以上问题进行优化及改进。文章是在这个背景下,针对该SUV车型的向左行驶跑偏现象,通过对问题零部件进行交叉试验,三坐标尺寸测量以及生产线生产过程一致性的逐一排查,逐一分析了四种问题发生的根本原因,并由此提出了优化改进方案,通过对比方案实施前后的实测数据,验证优化改进方案是否可行。优化后实测行驶跑偏量,符合企业行驶跑偏判定标准,行驶跑偏现象消失并保证了该SUV车型的正式量产时间。     

基于神经网络的疲劳驾驶识别系统

驾驶疲劳识别系统主要依据驾驶员眼部信号、驾驶行为、生理信号等来判断疲劳状态。文章通过BP神经网络与疲劳驾驶相结合,对疲劳参数进行分析,建立基于神经网络的疲劳驾驶实时识别系统,从而提高疲劳检测的准确率。     

Forward power-train energy management modeling for assessing benefits of integrating predictive traffic data into plug-in-hybrid electric vehicles

In this paper, a forward power-train plug-in hybrid electric vehicle model with an energy management system and a cycle optimization algorithm is evaluated for energy efficiency. Using wirelessly communicated predictive traffic data for vehicles in a roadway network, as envisioned in intelligent transportation systems, traffic prediction cycles are optimized using a cycle optimization strategy. This resulted in a 56-86% fuel efficiency improvements for conventional vehicles. When combined with the plug-in hybrid electric vehicle power management system, about 115% energy efficiency improvements were achieved. Further improvements in the overall energy efficiency of the network were achieved with increased penetration rates of the intelligent transportation assisted enabled plug-in hybrid electric vehicles.     

工作记忆对驾驶行为影响的进展综述

从工作记忆的测量范式、研究方法入手,总结工作记忆对驾驶行为的影响。梳理了国内外工作记忆与驾驶行为关系的研究现状。结果表明,与工作记忆容量低的驾驶员相比,工作记忆容量高的驾驶员,在一定的认知任务下,驾驶稳定性更好。此外,文章预估了工作记忆在驾驶行为领域今后的发展趋势,总结了现有研究的不足,从工作记忆量化及工作记忆训练的角度上为驾驶行为研究领域的发展提供了思路。