非接触式胎压安全报警系统的研究

在现代汽车上,轮胎气压对汽车的安全性、舒适性、经济性以及操纵稳定性都有非常大的影响。为了能更好地对轮胎气压起到更准确的监控,笔者在对已有的类似系统进行了简单介绍后,通过半径比较法和频率修正法设计研究了一种非接触式胎压安全报警系统。最后采用了一个应用实例,说明了该系统的实用性和科学性。     

安全的非接触式感应车窗玻璃升降系统

汽车车窗玻璃升降系统由来已久了。一开始是手动摇柄操作系统，实用但麻烦。之后是电动车窗玻璃升降系统，容易操作，但也有不安全的隐患，如孩子的手有可能被夹在窗玻璃中等。接触式感应技术的出现可有效解决以上问题。当上升的玻璃碰到人的手指或手臂时，系统能够立即感应到，并发出相关指令，使得车窗玻璃由上升运动转变为下     

别克林荫大道胎压监测系统

别克林荫大道轮胎气压监测系统（TPMS）通过遥控门锁发射器、车身控制模块（BCM）、遥控门锁接收器（RCDLR）、4个无线电频率传输气压传感器、仪表板组合仪表（IPC）、转向灯和串行数据电路，执行轮胎气压监测、显示及读人等功能。当系统监测到4个轮胎中的任何1个轮胎的气压严重下降时，轮胎气压监测系统便会对驾驶员发出警报，     

了如指掌 铁将军胎压监测报警系统

人们常爱以“了如指掌”来形容对某种事物掌握得很透彻,可见人们对“指掌”是再熟悉不过的。但对作为汽车“指掌”而存在的轮胎在行车中的状况,人们却经常因为技术困难而忽略。这恰恰是很不应该的。轮胎是保障汽车安全的基础部件之一,其状况状态应是驾车者最该了解的事情之一。现在,铁将军的胎压监测报警系统可以把这一问题轻松解决,让你了解轮胎如同了解自己的指掌。     

基于图像识别的非接触式索力测试系统的研究

为有效提升振动频率法索力测试的效率与精度,简化测量流程并降低测量成本,提出了一种基于图像识别的非接触式索力测试方法。首先,在拉索上粘贴标靶建立起斜拉索特征,利用手机等终端设备拍摄拉索振动视频,并通过视频数据分解获取拉索振动的图像序列;其次,基于改进的二值化与斑点检测算法对标靶进行识别跟踪,并通过形心拟合实现标靶精确定位,从而计算得到拉索振动时程曲线,经频谱分析后利用振动频率法计算得到拉索索力;最后,基于业务流程与实际需求,设计实现了基于图像识别的非接触式索力测试系统。通过实桥应用,证明了该系统可操作性强、测试精度高,易于在桥梁建设工程中推广。     

非接触式自卸汔车车箱升降报警系统的设计

针对自卸汽车行车时车箱处于起升状态易出现事故隐患的问题,设计了一种非接触式的报警系统,介绍了该系统工作原理及安装方法。该系统采用电感式接近开关采集信号,通过继电器控制报警装置,使车箱在举升时发出报警：     

车用防抱死制动系统的研究

阐述了汽车防抱死制动系统ABS的发展、功能及组成,分析了ABS系统控制参数的选取和轮速测量方法,并用程序模拟实验仿真。     

非接触式检测技术

在检测过程中,把传感器置于被测对象上,可灵敏地感知被测参量的变化,这种接触式检测方法通常比较直接、可靠,测量精度较高,但在某些情况下,因传感器的加入会对被测对象的工作状态产生干扰,而影响测量的精度。而在有些被测对象上,根本不允许或不可能安装传感器,例如测量高速旋转轴的振动、转矩等。因此,各种可行的非接触式     

汽车ABS轮速传感器性能测试系统的研究

设计了汽车ABS轮速传感器性能测试系统,开发了相应的测试与数据采集软件。进行了试验,并对采集到的数据进行分析处理。研究结果表明:该系统工作可靠、实施方便、抗干扰能力强,为研究ABS提供了方便。     

汽车轮胎压力监测系统的发展动态

轮胎气压保持正常值是汽车行驶安全性和舒适性的重要保证。由于胎压的非正常而引发的交通事故频频发生。因此,能够对胎压进行实时监测就显得尤为重要。本文较全面地叙述了国内外轮胎气压监测技术的研究成果及发展现状,介绍了汽车轮胎气压监测系统的作用、基本构造及工作原理。同时对我国轮胎气压监测系统的发展提出建议。     

有安全,才能出效益——米其林积极开展轮胎安全教育活动

近日,世界轮胎的著名品牌米其林公司在全国4个主要城市展开轮胎安全知识普及教育活动,以加强正确使用及保养轮胎和道路交通安全知识在媒体及大众中的普及.此次活动是继2007年6月米其林宣布与中国道路交通安全协会展开合作以来,米其林开展的针对轮胎使用、道路交通安全的后续活动,受众普及东北三省、华东各大省市和华南、西南的广大区域.     

An optical tire contact pressure test bench

An optical tire contact pressure test bench developed by the IMMa group is described. The measurement system is based on the frustration of total internal reflection (FTIR) of light. The test bench allows performing normal pressure distribution and patch contact shape measurements on passenger car tires. The system is based on the use of a laterally illuminated glass on which the tire leans. Between them a plastic interphase is located that will cause the FTIR of light. A video camera catches the formed shining image through the glass. The brightness level in each pixel of the image can be related to the existing normal pressure. The study of the contact patch provided by the bench makes it possible to characterize tire behaviour under different loading states, inflation pressure, tire defects and toe and camber angles. The bench incorporates a computerized load and control system of the tire operation parameters, an image acquisition module and a data acquisition system that allow monitoring and acting on the experimental variables of interest in the tests such as load on the tire and environmental conditions. A supporting mechanical system incorporated to the bench allows providing the tire with variable toe and camber angles. From the images obtained with this system, the maximum normal pressure points, total force, size and shape of the patch can be determined, which are related to the tire-use conditions. As an application example, results that show the patch size and shape under different load and tire inflation pressures are presented. A further application, which is the use of the system for the detection and study of defective tires is also presented.     

An optical tire contact pressure test bench

An optical tire contact pressure test bench developed by the IMMa group is described. The measurement system is based on the frustration of total internal reflection (FTIR) of light. The test bench allows performing normal pressure distribution and patch contact shape measurements on passenger car tires. The system is based on the use of a laterally illuminated glass on which the tire leans. Between them a plastic interphase is located that will cause the FTIR of light. A video camera catches the formed shining image through the glass. The brightness level in each pixel of the image can be related to the existing normal pressure. The study of the contact patch provided by the bench makes it possible to characterize tire behaviour under different loading states, inflation pressure, tire defects and toe and camber angles. The bench incorporates a computerized load and control system of the tire operation parameters, an image acquisition module and a data acquisition system that allow monitoring and acting on the experimental variables of interest in the tests such as load on the tire and environmental conditions. A supporting mechanical system incorporated to the bench allows providing the tire with variable toe and camber angles. From the images obtained with this system, the maximum normal pressure points, total force, size and shape of the patch can be determined, which are related to the tire-use conditions. As an application example, results that show the patch size and shape under different load and tire inflation pressures are presented. A further application, which is the use of the system for the detection and study of defective tires is also presented.     

如何确定轮胎在使用过程中的标准气压

轮胎在使用中,严格执行轮胎标准中规定的气压是保证轮胎使用寿命和达到应有使用里程的基本条件之一。本文分析了轮胎承受的实际负荷以及使用速度对负荷的影响。     

汽车追尾碰撞预警系统开发研究

在理论建模的基础上，设计开发了汽车追尾碰撞预警测控系统，经阶段性装车试验，结果表明所开发的预警系统是有效和可行的；最后分析指出了本系统尚需改进的方向。     

Sliding-mode-based parameter identification with application to tire pressure and tire-road friction

This paper presents a method of simultaneous estimation of tire pressure and tire-road friction. A sliding-mode scheme is designed to identify the system state and the parameter variation of a torsional tire system, which greatly depend on the change in tire pressure. Then, the recursive least-squares method with a forgetting facto is used to estimate the parameter variations of the tire system and the tire-road friction force without a friction model using the information retrieved from the equivalent input for sliding motion. A simulation study is performed to illustrate the effectiveness of the proposed method.     

A self-powering system based on tire deformation during driving

Tire intelligence is vital in the improvement of the safety of vehicles because the tire supports the car body and is the contact point between the vehicle and the road. To create an intelligent tire, sensors must be installed to measure the behavior of the tire. However, it is difficult to apply a wired sensor system on the wheel of the tire. Hence, it is necessary to implement a self-powering, wireless system (a type of energy harvesting system) that can be mounted inside the tire. The purpose of this study is to convert the strain energy caused by deformation of the tire while driving into useful electrical energy to supply the sensor system. A flexible piezofiber is utilized for the energy conversion. The variation in strain, due to changes in speed, load, and the internal pressure of the tire, was measured along two axial directions to evaluate the amount of available strain energy. The amount of strain changed from 0.15% to 0.8%. To predict the amount of available energy from a tire, we perform an analysis of the relationship between the strain and the voltage. In addition, experiments for impedance matching between piezofiber and related circuits were conducted to optimize the external loads for transferring energy efficiently. Based on the procedure mentioned above, at least 0.58 mJ of electrical energy can be generated by using the laterally oriented strain (1500 to 2500 micro strain). The result of this study is expected to enhance the potential realization of self-generating wireless sensor systems for so-called ??intelligent?? tires.     

道路安全系统与道路安全工程

从系统的角度分析了道路安全的相关因素,提出了中国应采取的道路安全战略,介绍了道路安全战略和道路安全工程的内容与框架,并指出实施道路安全工程对改善中国的道路安全状况具有十分重要的意义.