机动车交汇时灯具炫目性的讨论

在背景亮度为1 cd/m2的晚上,摩托车及汽车驾驶员无论使用近光灯、转向信号灯或专用昼间行驶灯,在各交汇距离相对上升对比度阈值小于2时,均不会产生炫目,不会影响对向行驶摩托车驾驶员的观察和判断能力;而摩托车和汽车远光灯在任何距离时的相对上升对比度阈值远远大于2时,在摩托车和摩托车交汇时,会产生炫目,造成交通行驶隐患.     

谈昼间行驶灯的设计及控制方法

针对国内外法规对昼间行驶灯要求,描述灯具设计、电气控制方法,重点讲述昼间行驶灯控制设计方案。     

汽车LED灯用配光透镜研究及应用

正昼间灯是一种新型的信号灯具,安装在车身前部,主要用于在白天行车视线环境较差的情况中,制造信号让道路的其他参与者尽早地发现自己,它的功效不是为了使驾驶员能看清路面,而是为了让别人知道有一辆车开过来了。因此,这种灯具不是照明灯,而是一种信号灯。固然,加装了昼间行驶灯可使汽车看起来更酷、更炫,但白天行驶灯的最大功效不在于美观,而是提供车辆的被辨识     

基于欧盟标准的某型轻卡昼间行车灯控制策略

昼间行车灯在欧盟作为一项强制规定已实施多年,其安全性和美观性已为汽车用户广泛接受。根据欧盟及国内相关法规要求,昼间行车灯与其他功能车灯存在多种逻辑关系。本文以某型轻卡前组合灯昼间行车灯开发为例,介绍了昼间行车灯的控制策略。     

昼间行车灯智能控制系统设计

设计一种基于单片机的昼间行车灯智能控制系统,可精确实现昼间行车灯与其他信号灯之间的逻辑控制,有效预防电磁冲击和反向电压的干扰,提高昼间行车灯的稳定性。     

某车型昼间行驶灯灯光律动失效问题的整改方法

本文通过对某车型昼间行驶灯灯光律动失效问题的研究与分析，有针对性地提出整改方案，并通过简易台架试验、实车测试及道路试验验证整改方案的可行性，有效解决灯光律动失效的问题。     

国产摩托车用闪光继电器介绍

摩托车用闪光继电器是摩托车上一个既不起眼,但又不可或缺的重要保安部件,它的主要作用就是用闪烁的转弯指示灯光,提示前方或后方车辆、行人,表明自己将要行驶的方向和行驶的车道,从而达到安全行车的目的。随着高速公路的诞生和发展,闪光器的这一特殊功能在车辆的安全性上尤显重要,所以行业国际标准特别规定:闪光器产品必须具有缺灯显示功能即“当转弯灯缺一     

编辑絮语

<正>JC出没注意![Speed Boy]骑辆国产或是小排量的摩托车行驶在北京市区,在众多警察眼皮下穿行一般会很少招惹麻烦。但要是换成是大排量摩托车就会大不一样了,记得一次我骑着一辆CB1300在等灯,身后突然蹦出来一位神勇的警     

摩托车刹车灯延时熄灯电路

快速行驶的摩托车在遇到意外情况或需转弯时,需要用脚踏刹车使车减速或停下来,一般的摩托车都是脚踏刹车后刹车灯亮,刹车一复位,刹车灯随即熄灭,这样,不易引起后面车辆的注意。如果给摩托车加装此电路后,能使摩托车刹车灯像小汽车灯一样在刹车复位后再延时亮几秒钟,以提醒后面的车辆注意,这对交通安全,减少交通事故有实际意义。     

摩托车用多功能报信器

本装置用在摩托车上,可实现空档报信和左、右转弯灯忘关报信两个功能。这样,可有效避免驾驶者在较强的阳光下不易观察到空档指示灯的亮灭,以及在行驶中忘关左、右转弯灯的情况。工作原理:电路如图所示,虚线左侧为摩托车原有电气线路,右侧为加装的报信器电路。图中的“(?)”为蓄电池负极     

Real-time vision-based blind spot warning system: Experiments with motorcycles in daytime/nighttime conditions

This paper describes a real-time vision-based blind spot warning system that has been specially designed for motorcycles detection in both daytime and nighttime conditions. Motorcycles are fast moving and small vehicles that frequently remain unseen to other drivers, mainly in the blind-spot area. In fact, although in recent years the number of fatal accidents has decreased overall, motorcycle accidents have increased by 20%. The risks are primarily linked to the inner characteristics of this mode of travel: motorcycles are fast moving vehicles, light, unstable and fragile. These features make the motorcycle detection problem a difficult but challenging task to be solved from the computer vision point of view. In this paper we present a daytime and nighttime vision-based motorcycle and car detection system in the blind spot area using a single camera installed on the side mirror. On the one hand, daytime vehicle detection is carried out using optical flow features and Support Vector Machine-based (SVM) classification. On the other hand, nighttime vehicle detection is based on head lights detection. The proposed system warns the driver about the presence of vehicles in the blind area, including information about the position and the type of vehicle. Extensive experiments have been carried out in 172 minutes of sequences recorded in real traffic scenarios in both daytime and nighttime conditions, in the context of the Valencia MotoGP Grand Prix 2009.     

摩托车道路行驶阻力分析与测量

分析了摩托车道路行驶阻力的数学模型,并在天津摩托车技术中心试验场对某125型摩托车采用滑行能量法进行了滑行参数测量。用最小二乘法拟合出摩托车的行驶阻力曲线,并将该曲线在不同速度下的阻力数值与当量惯量法的阻力数值进行了比较,二者达到了很好的统一。     

Effect of Frame Compliance on the Lateral Dynamics of Motorcycles

The lateral dynamics of an uncontrolled motorcycle, running on a straight, level road surface, is investigated in this paper. The structural compliances in the front and the rear frames of the motorcycle are taken into account by introducing additional degrees of freedom in the analysis. The kinematics of the tires is represented by linear differential equations which are based on the taut-string model of pneumatic tires. The linear differential equations of motion are solved to yield the eigensolutions of the system. Numerical results, obtained for parameters corresponding to a Honda CB750 motorcycle, are presented and discussed.     

摩托车轻合金车轮径向冲击试验数据分析

摩托车轻合金车轮质量的好坏直接关系到摩托车骑乘者的人身安全,而摩托车轻合金车轮的径向冲击试验结果直接反映了车轮质量的优劣。通过对车轮径向冲击试验数据进行分析,以对车轮额定载荷的设定提出建议,希望摩托车整车企业及车轮生产企业合理设计轻合金车轮的额定载荷。     

摩托车轮胎碰撞分析

当摩托车发生碰撞时,前轮胎首先接受到冲击反作用力,这个力将对摩托车运行和骑乘者产生非常严重的后果。通过建立摩托车轮胎有限元模型来模拟摩托车轮胎的碰撞情况,将摩托车前轮胎受到的反作用力十分精确地计算出来,从而进行研究和分析。     

Effect of Frame Compliance on the Lateral Dynamics of Motorcycles

SUMMARY

The lateral dynamics of an uncontrolled motorcycle, running on a straight, level road surface, is investigated in this paper. The structural compliances in the front and the rear frames of the motorcycle are taken into account by introducing additional degrees of freedom in the analysis. The kinematics of the tires is represented by linear differential equations which are based on the taut-string model of pneumatic tires. The linear differential equations of motion are solved to yield the eigensolutions of the system. Numerical results, obtained for parameters corresponding to a Honda CB750 motorcycle, are presented and discussed.     

The effect of the inflation pressure of tyres on motorcycle weave stability: experiments and simulation

Increasing the stability of a motorcycle requires an understanding of the optimal conditions of the tyre. The inflation pressure is one of the main parameters that directly affects the tyre properties, which in turn influences motorcycle stability and safety. This paper focuses on the effect of the inflation pressure of the tested tyres on motorcycle weave stability. Experimental data are collected from tests carried out in straight running at constant speed. The data analysis is based on stochastic subspace identification methods. Simulations are performed using an advanced motorcycle multi-body code with parameters measured from the tested vehicle. Finally, the comparison between simulations and experimental tests is discussed. The research results show an agreement between experimental tests and simulations where weave stability increases with inflation pressure for the specified range of tyre pressure.     

踏板车发动机吊架装置的设计

通过在摩托车整车性能测试系统上跑车,对HN125T-2摩托车发动机与车架刚性连接进行振动信号测试,分析发动机振动对车辆动态性能的影响,提出发动机与车架弹性连接的方案,设计合理的结构装置,并用相同实验方法和数据处理方法进行振动信号测试验证,最大限度地减小了发动机振动对车辆动态性能的影响。     

The Influence of Structural Flexibilities on the Straight-running Stability of Motorcycles

A new tyre model for studies of motorcycle lateral dynamics, and three new motorcycle models, each incorporating a different form of structural compliance, are developed. The tyre model is based on “taut string” ideas, and includes consideration of tread width and longitudinal tread rubber distortion and tread mass effects, and normal load variation. Parameter values appropriate to a typical motorcycle tyre are employed. The motorcycle models are for small lateral perturbations from straight running at constant speed, and include (a) lateral compliance of the front wheel in the front forks, (b) torsional compliance of the front forks, and (c) torsional compliance in the rear frame at the steering head about an axis perpendicular to the steering axis.

Results in the form of eigenvalues, indicating modal damping properties and natural frequencies are presented for each model. The properties of four large production machines for a range of forward speeds, and the practicable range of stiffnesses are calculated, and the implications are discussed.

It is concluded that typical levels of structural compliance in models (a) and (c) contribute significantly to the steering behaviour properties of large motorcycles, and their observed behaviour can be understood better in terms of the new results than of those existing previously. Some conclusions relating to optimal structural stiffness properties are also drawn.