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汽车安全部件的工作状态直接影响汽车的安全行驶,运用小波变换理论对汽车在不同部件参数作用下的运动参量进行小波分解。提取相关低频信号和车辆动态评价指标作为汽车运动的特征值,结合神经网络技术进行了部分安全部件的故障状态识别。 相似文献
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为了提高汽车行驶和制动时的方向稳定性,最大程度地减少轮胎磨损,确保汽车的安全性、舒适性,’对于现代汽车而言,随着其行驶速度的提高、超低压扁平胎的使用,以及后轮独立悬架的普及,其车轮定位除车轮定位的参数值有减小或呈负值的趋势外,还由传统的前轮定位演变成当前的四轮定位,即除转向轮定位外,部分轿车还具有后轮外倾角和前束等参数,称为四轮定位。在汽车行驶中出现下列情况:直线行驶困难;前轮摇摆不定,行驶方向漂移;轮胎出现不正常磨损;更换了悬架系统、转向系统有关部件或汽车前部在碰撞事故后进行了维修时,需进行四轮定位的检测和调整。 相似文献
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汽车行驶时,照明灯具是不可缺少的。汽车灯具主要功能有2点:照明功能,即照亮道路、交通标志、行人、其它车辆,以识别标志和障碍物;信号功能,即显示车辆的存在和传达车辆的行驶状态信号。汽车的照明和信号是汽车重要的安全部件。在相关汽车105项欧洲ECE法规中有36项是直接与汽车 相似文献
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汽车的行驶安全影响着千家万户的幸福,决定着汽车行驶是否安全的因素很多,其中环境因素是重要因素之一。汽车行驶环境当中盲区的存在,更是加大了行车的危险性,驾驶员对行驶当中可能存在和出现的盲区若能有清醒的认识,就会避免许多事故的发生。文章对盲区进行详细分析,以确保行驶安全。 相似文献
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减振器和轮胎、制动部件一样属于汽车易损件,其寿命很大程度上取决于行驶汽车的习惯及维护保养.在售后服务中,服务站每年都会索赔大量的减振器.笔者通过统计和分析,对减振器故障模式、发生原因及日常使用保养中注意的问题进行归纳整理,供广大服务站及用户参考. 相似文献
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减振器作为悬架系统的重要部件,能有效衰减汽车行驶过程中因路面及载荷引起的对车架、车身的冲击,提高汽车行驶平顺性和舒适性。文中通过对商用车底盘减振器故障件进行旧件解析,归纳了减振器的常见故障模式并分析了故障产生原因,为商用车底盘减振器设计及售后维修判定提供参考。 相似文献
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介绍了世界先进国家研制汽车防撞雷达的概况,对汽车行驶安全的技术因素进行了分析,引用了一些有参考价值的统计数字,进而对汽车安全控制系统做了可行性分析。将我国在汽车安全控制系统方面的技术研究成果,应用到汽车上,实现了汽车行驶速度的自动控制,为解决汽车防撞、防抱等安全问题迈出了一步。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(9):1153-1170
An important development of the steering systems in general is active steering systems like active front steering and steer-by-wire systems. In this paper the current functional possibilities in application of active steering systems are explored. A new approach and additional functionalities are presented that can be implemented to the active steering systems without additional hardware such as new sensors and electronic control units. Commercial active steering systems are controlling the steering angle depending on the driving situation only. This paper introduce methods for enhancing active steering system functionalities depending not only on the driving situation but also vehicle parameters like vehicle mass, tyre and road condition. In this regard, adaptation of the steering ratio as a function of above mentioned vehicle parameters is presented with examples. With some selected vehicle parameter changes, the reduction of the undesired influences on vehicle dynamics of these parameter changes has been demonstrated theoretically with simulations and with real-time driving measurements. 相似文献
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Robust yaw stability control for electric vehicles based on active front steering control through a steer-by-wire system 总被引:2,自引:0,他引:2
K. Nam S. Oh H. Fujimoto Y. Hori 《International Journal of Automotive Technology》2012,13(7):1169-1176
A robust yaw stability control design based on active front steering control is proposed for in-wheel-motored electric vehicles with a Steer-by-Wire (SbW) system. The proposed control system consists of an inner-loop controller (referred to in this paper as the steering angle-disturbance observer (SA-DOB), which rejects an input steering disturbance by feeding a compensation steering angle) and an outer-loop tracking controller (i.e., a PI-type tracking controller) to achieve control performance and stability. Because the model uncertainties, which include unmodeled high frequency dynamics and parameter variations, occur in a wide range of driving situations, a robust control design method is applied to the control system to simultaneously guarantee robust stability and robust performance of the control system. The proposed control algorithm was implemented in a CaSim model, which was designed to describe actual in-wheel-motored electric vehicles. The control performances of the proposed yaw stability control system are verified through computer simulations and experimental results using an experimental electric vehicle. 相似文献
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汽车电子转向技术发展与展望 总被引:22,自引:0,他引:22
汽车电子转向系统是一种全新概念的转向系统,其取消了转向盘和转向车之间的机械连接,通过软件协调它们之间的运动关系,可以实现一系列传统转向系统无法实现的特殊功能。它可以实现传动比的任意设置,并对随车速变化的参数进行补偿。并且可以和ABS、汽车动力学控制、防碰撞、单个车轮转向、轨道跟踪、自动侧向导航等功能相结合,实现对汽车的整体控制。综述了国外汽车电子转向技术的研究现状,介绍了电子转向系统的结构及性能特点,阐述了电子转向系统的关键技术、主要问题及解决方法,并展望了电子转向系统的发展趋势。 相似文献
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M. S. Wang N. T. Jeong K. S. Kim S. B. Choi S. M. Yang S. H. You J. H. Lee M. W. Suh 《International Journal of Automotive Technology》2016,17(1):165-173
Drowsy behavior is more likely to occur in sleep-deprived drivers. Individuals’ drowsy behavior detection technology should be developed to prevent drowsiness related crashes. Driving information such as acceleration, steering angle and velocity, and physiological signals of drivers such as electroencephalogram (EEG), and eye tracking are adopted in present drowsy behavior detection technologies. However, it is difficult to measure physiological signal, and eye tracking requires complex experiment equipment. As a result, driving information is adopted for drowsy driving detection. In order to achieve this purpose, driving experiment is performed for obtaining driving information through driving simulator. Moreover, this paper investigates effects of using different input parameter combinations, which is consisted of lateral acceleration, longitudinal acceleration, and steering angles with different time window sizes (i.e. 4 s, 10 s, 20 s, 30 s, 60 s), on drowsy driving detection using random forest algorithm. 20 s-size datasets using parameter combination of accelerations in lateral and longitudinal directions, compared to the other combination cases of driving information such as steering angles combined with lateral and longitudinal acceleration, steering angles only, longitudinal acceleration only, and lateral acceleration only, is considered the most effective information for drivers’ drowsy behavior detection. Moreover, comparing to ANN algorithm, RF algorithm performs better on processing complex input data for drowsy behavior detection. The results, which reveal high accuracy 84.8 % on drowsy driving behavior detection, can be applied on condition of operating real vehicles. 相似文献
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于槐三 《筑路机械与施工机械化》1992,9(4):13-14
本文介绍了西安筑路机械厂生产的 WB220型稳定土拌和机的性能特点和主要技术参数,并分别对传动系统、行走系统、转向系统、制动系统、工作装置做了描述. 相似文献
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Matthijs Klomp Mats Jonasson Leo Laine Leon Henderson Enrico Regolin Stefan Schumi 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2019,57(7):1028-1061
ABSTRACTIn this paper, we describe how vehicle systems and the vehicle motion control are affected by automated driving on public roads. We describe the redundancy needed for a road vehicle to meet certain safety goals. The concept of system safety as well as system solutions to fault tolerant actuation of steering and braking and the associated fault tolerant power supply is described. Notably restriction of the operational domain in case of reduced capability of the driving automation system is discussed. Further we consider path tracking, state estimation of vehicle motion control required for automated driving as well as an example of a minimum risk manoeuver and redundant steering by means of differential braking. The steering by differential braking could offer heterogeneous or dissimilar redundancy that complements the redundancy of described fault tolerant steering systems for driving automation equipped vehicles. Finally, the important topic of verification of driving automation systems is addressed. 相似文献
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H. S. Wi Y. K. Lee J. I. Park J. H. Lee K. S. Park 《International Journal of Automotive Technology》2009,10(6):771-776
This paper focuses on fuel economy improvement according to the type of power steering system. Usually, a conventional power
steering system is directly driven by the crankshaft of the engine with a belt, known as HPS (hydraulic power steering). However,
there is some inefficiency with this system at high engine speeds. To improve this inefficiency, automobile makers have developed
two power steering systems: EHPS (electro-hydraulic power steering) and MDPS (motor-driven power steering) or EPS (electric
powered steering). However, there has been insufficient study of effects of the type of power steering system on fuel economy.
In this paper, the effect of the type of power steering system on fuel economy is studied experimentally, and calculations
of the effect on vehicle fuel economy are presenting using computer simulation with AVL cruise software. The results demonstrate
that a 1% vehicle fuel economy improvement can be achieved in a vehicle with an electro-hydraulic power steering system compared
to a vehicle with a hydraulic power steering system. In addition, a 1.7% vehicle fuel economy improvement can be achieved
using a full electric power steering system in a FTP-75 driving cycle. These results could be used to choose a power steering
system. 相似文献