更安全的轮胎压力监测系统

安装在汽车轮毂上的自动轮胎压力电子监测组件可测量轮胎气压和温度,并在必要时将这些信息传送给中央显示单元。本文将介绍直接测量的轮胎压力监测系统(TPMS)。     

一种硬线胎压监测系统报警显示策略的设计应用

胎压监测系统(Tire Pressure Monitoring System)简称TPMS,通过安装在轮胎上的胎压监测传感器来监测轮胎内部压力和温度,并采用无线射频的方式,把传感器采集到的压力和温度数据信息发送到胎压监测控制器,数据经过处理后在仪表盘上通过报警指示灯显示出来。文章介绍了一种硬线胎压监测系统报警显示策略,主要对系统的低压报警、高压报警、快速漏气报警、高温报警、电池低电量报警、传感器失效提示等功能逻辑的设计。     

轮胎压力监测系统中小环天线的设计

针对汽车轮胎压力监测系统(TPMS)中天线设计这一技术难点,分析了小环天线的一般性能,用谐振分析法设计了天线,用变压器匹配法为天线和射频发射芯片设计了匹配网络。试验结果表明,设计的小环天线数据传输可靠,满足TPMS的要求。     

法拉利Sa Aperta超级跑车的轮胎气压复位

正一、概述车辆配备一个安装在轮辋内部靠近气门的特殊传感器来测量轮胎压力和温度,这些传感器传送信号,由车身上位于砂砾护板后方的天线进行接收,而天线连接至ECU。系统有时可能会受到类似频率的无线电干扰。ECU处理该信息并将有关轮胎压力和温度的数据以及任何系统故障传送到仪表板。ECU传输的信号以两种优先级启动TFT显示屏上的某些符号。(1)温和警告(SW):压力损失相对于额定压力超过0.2bar(1bar=10~5Pa)。     

基于单片机控制的无源无线胎压监测系统

本方案采用谐振器型声表面波传感器作为胎压监测单元,提出了一种基于单片机控制的无源无线胎压监测系统。本文从无电池式TPMS的角度入手,介绍了声表面波传感器的工作原理,根据传感器的特点设计出一个温度压力测量方案,该系统具有无源无线、体积小、灵敏度高、调试方便等优点,在未来有很大的应用价值。     

别克荣御轿车轮胎气压监测系统故障诊断

别克荣御(Royaum)轿车装备了轮胎气压监测系统(TPMS),当车辆行驶时,系统不断监测4个轮胎内的空气压力,安装在每个轮胎气门杆上的压力传感器周期性地测量轮胎的实际压力,压力信息通过射频(RF)通信传送至安装在车辆后窗台板下的轮胎气压监测系统模块,轮胎气压监测系统模块解译收到的射频信号,并将数据格式化,然     

北汽绅宝胎压监测系统原理及检修

<正>轮胎气压监测系统(TPMS)用于在汽车行驶时,对轮胎的压力进行监测,在监测到轮胎气压异常时进行报警,提醒驾驶员采取措施,避免危险情况发生。1 TPMS系统类型北汽绅宝系列车型安装有直接式或间接式轮胎气压监测系统。直接式胎压监测系统,利用安装在轮胎里的胎压传感器来直接测量轮胎的气压,对各轮胎气压、温度进行监测及显示,当轮胎气压、温度异常时,自动进行报警;间接式胎     

VDO扩展TPMS产品组合以覆盖冬季轮胎

<正>时至如今,大量车主陆续开始更换冬季轮胎,越来越多的胎压监测系统(TPMS)被安装到乘用车上,这代表着对车间工作效率的进一步挑战。仅今年一年,约150万辆配有相应传感器的汽车将在德国注册,由于VDO REDI传感器,车间技工能在繁忙的日程安排中节约宝贵的时间,并优化TPMS服务活动的配置,这些可重复使用、稳健通用的传感器可立即安装。同时,VDO已扩大了TPMS产品组合以覆盖第四代传感器。VDO REDI传感器预编     

汽车轮胎压力监测系统设计

轮胎作为车辆与地面的唯一接触部件,轮胎中的气压变化对车辆的驾驶舒适性、燃油经济性和道路安全有着显著影响,但是,驾驶员经常忽略轮胎的状况和轮胎内的压力值,这为交通安全带来了隐患。有源电子设备尺寸和功耗的不断减小以及无线通信的进步使得无线传感器能够在工业和汽车应用中得到广泛使用,轮胎压力监测系统（TPMS）由每个轮胎内的无线轮胎压力传感器（TPS）模块和汽车内的单个接收器组成,汽车轮胎压力的监测和解决方法已成为安全驾驶的重要发展方向。文章设计的轮胎压力监测系统使用SP12传感器,采用了低频唤醒方法,选用了ABLE（爱博尔）公司的ER2450提供稳定的电源用于给系统供电,并通过后续系统的验证和测试结果,说明该汽车轮胎压力监控系统软件设计的合理性和可行性。研究结果对提高汽车的行驶安全性有一定参考价值。     

TPMS中轮胎自动定位功能的实现

自动轮胎定位技术是目前应用于直接式TPMS中的一项最新技术。自动轮胎定位技术基于三维近场源定位技术,通过安装于轮胎内的二维LF接收天线、LF接收唤醒模块和中央监视器内的三维LF发射天线实现。该技术的应用避免了轮胎位置置换所引起的系统参数重新设置等问题,提高了系统的智能性,且实现简单。     

The effect of worn profile on wear progress of rail vehicle steel wheels over curved tracks

Dynamic performance, safety and maintenance costs of railway vehicles strongly depend on wheelset dynamics and particularly on the design of wheelset profile. This paper considers the effect of worn wheel profile on vehicle dynamics and the trend of wear in the wheels as a result of the vehicle movements. ADAMS/RAIL is used to build a multi-body system model of the vehicle. The track model is also configured as an elastic body. Measured new and worn wheel profiles are used to provide boundary conditions for the wheel/rail contacts. The fleet velocity profile taken during its normal braking is also used for the simulation. Wear numbers are calculated for different sets of wheels and the results compared with each other. Outcome of this research can be used for modifying dynamic performance of the vehicle, improving its suspension elements and increasing ride quality. It can also be further processed to reach to a modified wheel profile suitable for the fleet/track combination and for improved maintenance of the wheels. A major advantage of the computer models in this paper is the insertion of the wheel surface properties into the boundary conditions for dynamic modelling of the fleet. This is performed by regularly measuring the worn wheel profiles during their service life and by the calculation of the wear rate for individual wheels.     

On the feasibility of the optical steering wheel sensor: Modeling and control

This paper discusses the development of a system model for the wireless steering wheel angle sensor and steering wheel system for the evaluation of the steer by wire system in a vehicle dynamic system. The steering wheel sensor is a wireless, contact-less sensor utilizing an optical medium for angle detection. The optical medium is operated based on a photodiode and photo-detector head. A reflecting disc or code-wheel, working similar to a compact disc, is used to reflect the light from the photodiode back to the photo-detector. The beam is reflected based on the content in the reflective disc to measure the relative angle through a micro-controller. The proposed wireless steering sensor and steer by wire system is modeled using the Matlab/Simulink and their performance is investigated to evaluate the steering response, vehicle dynamics, and steering feel of the system. Finally, the feasibility of the proposed system is discussed based on the developed model and simulation results.     

A Pitch-Plane Model of a Vehicle with Controlled Suspension

A vehicle model incorporating front and rear wheel suspensions and seat suspension is presented. The suspension control includes algorithms to provide both dynamic and steady state (levelling) control. Vehicle response to (a) vertical inputs due to ground disturbances at the wheels and (b) longitudinal inputs due to the inertial forces during braking and accelerating, are investigated. It is shown that the static (self-levelling) control causes a slight deterioration in dynamic performance. The active ride control produces improvements of ride comfort under dynamic conditions compared to an equivalent passively suspended vehicle. In steady state the proposed control eliminates the error heave of the body caused by tilting of the vehicle with active suspension.     

Vehicle steering returnability with maximum steering wheel angle at low speeds

In this paper, an analytical model with suitable vehicle parameters, together with a multi-body model is proposed to predict steering returnability in low-speed cornering with what is expected to be adequate precision as the steering wheel moves from lock to lock. This model shows how the steering response can be interpreted in terms of vertical force, lateral force with aligning moment, and longitudinal force. The simulation results show that vertical steering rack forces increase in the restoring direction according to steering rack displacement for both the inner and outer wheels. As lateral forces due to side-slip angle are directed toward the medial plane of the vehicle in both wheels, the outer wheel pushes the steering wheel in the returning direction while the inner wheel does not. In order to improve steering returnability, it is possible to increase the total steering rack force in both road wheels through adjustments to the kingpin axis and steering angle. This approach is useful for setting up a proper suspension geometry during conceptual chassis design.     

A new flatness-based control of lateral vehicle dynamics

This paper presents a new concept for vehicle dynamics control (VDC). The control of the longitudinal vehicle dynamics is not discussed, since we are assuming that it is much slower and weakly coupled to the lateral and yawing dynamics. The actuators are considered to be the traction and the braking torques of the individual wheels and only the standard sensors of the common VDC system are used. A modular interface to the subordinate wheel control system is provided by choosing the yaw torque as a fictitious control input. The VDC system is designed by means of a two degrees-of-freedom control scheme. It comprises a flatness-based feedforward part and a stabilising feedback part. The reference trajectory generation is introduced for the flat output which is given by the lateral velocity of the vehicle. Thus an advantageous kind of body side-slip angle control is provided with the standard VDC system hardware. Extensive simulation studies show excellent performance of the designed control concept.     

一种汽车ESP仿真模型的研究

基于Pacejka的"魔术公式"轮胎模型,建立了包括汽车纵向与横向移动、横摆、侧倾和4个车轮的转动的8自由度动力学模型.设计了由汽车仿真模型和驱动系统、四通道制动系统、制动踏板、转向盘与油门踏板等实物以及控制器(ESP)等部分组成的半实物仿真平台.以侧向加速度与横摆角速度为仿真控制变量对模型进行仿真测试.仿真与实车测试数据相当接近,为ESP的研究提供了有效的模型.     

电传动矿用自卸车轮边电机驱动系统动态特性研究

矿区环境复杂,电传动矿用汽车的轮边电机传动系统对整车动力性、制动性及平顺性有极大影响,为了综合路面激励和电机自身激励综合分析驱动系统动态特性,采用数值仿真软件建立轮边电机传动系统模型,分析其在启动加速、平稳运行及制动时的动态特性,为了验证模型的准确性进行了实车实验.结果表明该轮边电机传动系统的输出转矩发生考虑波动转矩后...     

An investigation into the mechanism of the polygonal wear of metro train wheels and its effect on the dynamic behaviour of a wheel/rail system

This paper presents a detailed investigation conducted into the mechanism of the polygonal wear of metro train wheels through extensive experiments conducted at the sites. The purpose of the experimental investigation is to determine from where the resonant frequency that causes the polygonal wear of the metro train wheels originates. The experiments include the model tests of a vehicle and its parts and the tracks, the dynamic behaviour test of the vehicle in operation and the observation test of the polygonal wear development of the wheels. The tracks tested include the viaducts and the tunnel tracks. The structure model tests show that the average passing frequency of a polygonal wheel is approximately close to the first bending resonant frequency of the wheelset that is found by the wheelset model test and verified by the finite element analysis of the wheelset. Also, the dynamic behaviour test of the vehicle in operation indicates the main frequencies of the vertical acceleration vibration of the axle boxes, which are dominant in the vertical acceleration vibration of the axle boxes and close to the passing frequency of a polygonal wheel, which shows that the first bending resonant frequency of the wheelset is very exciting in the wheelset operation. The observation test of the polygonal wear development of the wheels indicates an increase in the rate of the polygonal wear of the wheels after their re-profiling. This paper also describes the dynamic models used for the metro vehicle coupled with the ballasted track and the slab track to analyse the effect of the polygonal wear of the wheels on the wheel/rail normal forces.     

Road disturbance estimation for the optimal preview control of an active suspension systems based on tracked vehicle model

This research investigates stochastic estimation of a look-ahead sensor scheme using the optimal preview control for an active suspension system of a full tracked vehicle (FTV). In this scheme, wheel disturbance input to the front wheels are estimated using the dynamic equations of the system. The estimated road disturbance input at the front wheels are utilized as preview information for the control of subsequently following wheels of FTV. The design of optimal preview control is used as a classical linear quadratic Gaussian problem by combining dynamics of the original system and estimation of previewed road inputs. The effectiveness of the preview controller is evaluated by comparing the estimated information with the measured information for different road profiles, where Kalman filter is used for the state-variables estimation of the FTV. This research also considers the reduced order estimation using commonly available sensors in order to decrease the number of sensors and measurements. The simulation results’ using an active suspension system with different preview information shows that the proposed system can be beneficial for the improvement of ride comfort of tracked vehicles without using any specialized sensors for preview information calculation.     

电动汽车转矩定向分配差速器建模与动态仿真

本文中提出一种新型具备转矩定向分配功能差速器的集中式电驱动桥系统。该集中驱动系统可以在不改变总驱动转矩的条件下,类似分布式驱动方式实现驱动转矩在左右轮间的任意分配,从而产生改变车辆横摆动力学的直接横摆力偶矩。首先,分析了转矩定向分配差速器结构特点及其工作原理;其次,利用键合图理论建立了其动力学模型,并仿真分析了其动态响应特性;然后,设计了转矩响应控制系统以改善该差速器的动态性能;最后,嵌入整车模型进行了联合仿真。结果表明,装备该差速器的车辆可任意分配左右轮驱动转矩,并有效改善车辆操控特性。