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目前,随着路况的改善,车辆行驶速度在不断地提高,这对驾驶员的技术也提出了新的要求。以一、二级道路为例:车辆在40公里/小时的速度行驶(11米/秒),驾驶员比较容易观察、判断处置道路情况;如果车辆是80公里/小时(22米/秒)的速度行驶,这就存在一个问题:在同样的时间,车辆行驶距离增长,道路情况也会随之增多,驾驶员就会感到措手不及,出现顾此失彼的现象。因此,驾驶员需要充分认识到观察、判断、处理情况是受到时间制约的这一特点, 相似文献
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另一方面,随着我国公路状况的不断改善,高等级公路迅速增加,车辆的行驶速度随之提高,乘客和驾驶员对车辆行驶中的振动和噪声问题也日趋敏感。为减轻车辆行驶中的振动和噪声,延长车辆的使用寿命,在维修中必须将不平衡的旋转零件进行平衡校验,并按正确的修理工艺及装配顺序安装,以使由于不平衡而产生的振动、噪音控制在允许的范围之内。在进行汽车修理时,对于主要高速旋转件, 相似文献
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公交车辆作为城市流动的“血脉”,运营时间长,路况复杂,人员流动大,车辆技术状况、驾驶员情绪和身体状况、周围环境条件等诸多因素都会诱发车辆运行事故,行驶记录仪可以对运行中的车辆和人员进行安全监管。 相似文献
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车辆最佳维护周期可提高车辆的技术状况,保证行车安全.文中基于行驶安全性这一优化目标,建立车辆最佳维护周期数学模型,并利用样本车故障数据进行参数估计求解和模型验证.结果显示选取的样本车(大众速腾1.6L),当行驶安全度S在0.90-0.95取值时,维护周期不超过8000km均可满足车辆安全行驶要求;运行试验表明该数学模型有效、可靠,可用于指导实际车辆的维护保养. 相似文献
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针对智能网联车编队行驶功能,文章设计了基于车用无线通信(C-V2X)技术仿真系统。依据车辆协作式行驶控制流程(车辆组队、车辆入队、车队稳定行驶以及车辆出队),搭建智能驾驶员模型对车辆进行控制,通过领航-跟随法引导车辆队列行驶,最后在Prescan中设计驾驶场景,并通过直连通信(PC5)模式4通信协议建立通信进行了仿真验证。结果表明,所搭建的车辆编队协同控制仿真系统能够有效完成车辆队列的形成、车辆入队、队列稳定行驶以及车辆出队等队列控制行为,并能够根据自动驾驶控制策略使队列保持稳定的车间距行驶。 相似文献
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车型:丰田混合动力PRIUS(NHW20)。症状:车辆起步、行驶中闯动,无法行驶。故障检修:车辆挂入前进挡时,踩下加速踏板,车辆行驶闯动,挂倒挡,行驶闯动加剧。勉强行驶中,车辆打滑指示灯开始闪烁, 相似文献
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车辆队列行驶技术作为智能交通系统中的重要组成部分,在节能减排、优化交通状态、提高行驶安全等方面具有重大意义。优化车辆队列行驶的空气动力学性能,是提高其节能减排作用的重要手段之一。文章详细总结了车辆队列行驶的空气动力学研究内容,根据影响队列空气动力学性能因素的不同,将其分为队列内部因素(车与车)和队列外部因素(车与环境),其中,队列内部因素阐述和分析了车辆造型、速度、车辆数目、间距及队列形式对整体的气动性能影响;队列外部因素阐述和分析了自然环境和道路环境对整体气动性能的影响,同时梳理了每种因素的发展与研究现状。最后总结了车辆队列行驶中空气动力学研究的关键技术和发展趋势,为将来队列行驶的推广应用提供理论基础。 相似文献
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汽车驱动桥发响原因分析 总被引:1,自引:0,他引:1
汽车驱动桥发响,是目前汽车生产、使用维修中存在的问题之一(在单、双级驱动桥中都有发生)。它直接影响到汽车的高速行驶和驱动桥使用寿命。本文以JN150车的八部发响驱动桥为研究对象,对其进行了观察、检测、分析,找出并排除了引起发响的因素,并重新装好驱动桥,使汽车正常运行。 相似文献
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J. S. Kim S. M. Kim J. H. Jeong S. C. Jeong J. W. Lee 《International Journal of Automotive Technology》2016,17(5):865-872
In recent years, a hybrid electric vehicle (HEV) has been considered a successful technology. Especially, in case of a full HEV, the motor can drive the vehicle by itself at low velocity or assist the engine at high load. To improve the hybrid electric vehicle’s efficiency, a regenerative braking system is also applied to recover from kinetic energy. In this study, an experimental control apparatus was set up with a parallel hybrid electric vehicle mounted on a chassis dynamometer to measure ECU (engine control unit) and MCU (motor control unit) signals, including the current and state of charge in the battery. In order to analyze regenerative braking characteristics, user define braking driving cycle was introduced and carried out using different initial velocities and braking times. The FTP 75 driving cycle was then adapted under different initial SOC (state of charge) levels. The experiment data was analyzed in accordance with the vehicle velocity, battery current, instant SOC level, motor RPM, engine RPM, and then vehicle driving mode was decided. In case of braking driving cycle, it was observed that SOC were increased up to 1.5 % when the braking time and the velocidy were 6 second and 60 km/h, respectively. In addition, using the FTP 75 driving cycle, mode 1 was most frequently operated at SOC 65 conditions in phase 1. In phase 2, due to frequent stop-go hills, percentage of mode 1 was increase by 22 %. Eventually, despite of identity, it was shown that the characteristics of phase 3 differed from phase 1 due to the evanishment of the effects of initial SOCs. 相似文献
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通过几个典型应用实例介绍了乐泰厌氧胶在汽车修理上的应用,乐泰厌氧胶应用在汽车维修方面主要有以下几方面优点:(1)工艺简单,使用方便,适用于一般车辆的大,中,小修理,更适用于汽车行驶过程的故障抢修,(2)简化了修理工艺,提高了效率,(3)密封和紧固的效果好。(4)降低了维修成本。 相似文献
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Dongmei Wu Haitao Ding Changqing Du 《International Journal of Automotive Technology》2018,19(1):135-146
Compared with internal combustion engine (ICE) vehicles, four-wheel-independently-drive electric vehicles (FWID EV) have significant advantages, such as more controlled degree of freedom (DOF), higher energy efficiency and faster torque response of an electric motor. The influence of these advantages and other characteristics on vehicle dynamics control need to be evaluated in detail. This paper firstly analyzed the dynamics characteristics of FWID EV, including the feasible region of vehicle global force, the improvement of powertrain energy efficiency and the time-delays of electric motor torque in the direct yaw moment feedback control system. In this way, the influence of electric motor output power limit, road friction coefficient and the wheel torque response on the stability control, as well as the impact of motor idle loss on the torque distribution method were illustrated clearly. Then a vehicle dynamics control method based on the vehicle stability state was proposed. In normal driving condition, the powertrain energy efficiency can be improved by torque distribution between front and rear wheels. In extreme driving condition, the electric motors combined with the electro-hydraulic braking system were employed as actuators for direct yaw moment control. Simulation results show that dynamics control which take full advantages of the more controlled freedom and the motor torque response characteristics improve the vehicle stability better than the control based on the hydraulic braking system of conventional vehicle. Furthermore, some road tests in a real vehicle were conducted to evaluate the performance of proposed control method. 相似文献