CAN-BUS多路信息传输系统故障分析及检测

分析了CAN—BUS多路信息传输系统的故障原因及常见故障,结合维修实例,说明了汽车多路信息传输系统各类故障的检测诊断步骤和方法。     

一种基于VECTOR CAN工具的整车CAN总线故障正向诊断方法

本文从CAN总线概况、CAN总线故障介绍、CAN总线诊断实车测试3方面详细介绍一种基于VECTOR CAN工具的整车CAN总线故障正向诊断方法。     

大众汽车CAN总线分析及故障检测(二)

<正>3 CAN总线系统的检测和维修CAN总线系统故障形式主要有CAN-High与CAN-Low短路,CAN-High对正极、对地短路,CAN-High断路,CAN-Low对正极、对地短路和CAN-Low断路共7种故障。对于这些故障可以通过示波器测量波形来检测,也可通过检测仪器进行诊断。     

轩逸车发动机无法起动

故障现象一辆东风日产轩逸轿车(搭载MR20DE发动机和CVT变速器),出现起动机工作正常,但发动机无法起动着机的现象。故障诊断首先验证故障现象,上述故障确实存在,而且还发现在接通点火开关时,冷却风扇保持高速运转。连接日产专用故障检测仪进行检测,发动机控制单元内储存的故障代码有:U1000——CAN通讯线路(故障);P0335——曲轴位置传感器(故障)。执行清除故障代码操作,发现U1000始终无法清除。查阅维修手册得知,当ECM在2s以上的时间内没有发送或接收与排放相关诊断的CAN通讯信号时设置故障代码U1000。该车的CAN系统具备较高的数据通讯     

汽车CAN通信系统的检测

以丰田皇冠汽车多路通信系统中CAN为例，介绍CAN通信系统的组成、故障码和CAN总线的一般检测步骤和方法。     

汽车CAN总线通信超时故障监测方法研究

随着汽车CAN总线技术的快速发展,汽车CAN控制器逐渐增多,CAN控制器之间的信息传递也逐渐增多。如何保证车内CAN控制器的通信可靠性和时效性,是CAN网络技术需要关注的重要课题。本文通过对汽车CAN总线控制器的研究,提出一种CAN总线控制器网络超时故障监测方法,可实现精确锁定汽车CAN通信节点的网络通信故障,快速锁定CAN控制器的通信问题,为CAN控制器的开发及故障解决提供可靠保障。     

多路通讯系统的波形分析与故障诊断(三)

(接上期) 　　四、CAN网络故障诊断 　　前面一节对于CAN网络各种情况下出现的波形进行了简单介绍,本节主要针对CAN网络故障的排除方法及步骤进行分析.针对CAN数据总线可能出现的故障,国际标准化组织(ISO)对CAN数据总线出现的故障进行了总结,如表3所示,ISO故障的第8项只能出现在驱动数据总线上.……     

整车试制阶段的CAN总线故障案例分析

随着控制器局域网（CAN）总线技术在汽车领域的广泛应用,解决CAN总线故障已成为汽车网络工程师的一项必备能力。文章从汽车研发的角度出发,首先阐述了处理总线故障的总体思路,然后介绍了几种常用的CAN总线诊断工具,最后从故障现象,诊断分析以及排查方法这几方面,对在实际项目工作中遇到的CAN总线故障进行了详细描述和说明。通过这些案例分享,可以为从事汽车CAN网络开发及应用的相关人员提供实践经验。     

一汽丰田卡罗拉轿车CAN总线检修

CAN(Controller Area Network控制器局域网)是一种实时应用的串行数据通讯总线系统.具有高性能和高可靠性,并易于检测故障.现今汽车上已普遍应用CAN总线网络系统,使得信息共享更便利,信息传递速度更快,信息传递更可靠,更多新技术应用中协同控制更容易,同时也减少了汽车线束,但给故障维修带来了困难.在CAN网络系统维修方面,难点在于CAN总线故障为跨系统的,故障的迷惑性强,如故障部位在发动机电路部分,但故障现象却表现在组合仪表上、空调系统上、ABS系统上等,另外,CAN总线故障发生机率低,很多维修人员未遇到过这方面的故障.     

启事

该故障扫描仪是OTC公司新近推出的一款功能强大．使用简单．操作方便的故障扫描仪。3409可以检测所有满足OBDⅡ要求的汽车．同时可以检测使用CAN—BASED的汽车并读取CAN—BASED的数据流。3409可以记录数据．回放数据．以曲线方式显示数据并可在数据流检测时随时锁定数据同时3409可以做汽车I／M硷测之前的预检测监测氧传感器的工作状况。3409软件可以升级，以满足未来汽车发展的需要。     

全液压推土机状态监测及故障诊断技术的研究

针对全液压推土机自身特征及作业特点,利用MC6控制器和DI2显示器构建了基于CAN-Bus总线的状态监测和故障诊断平台,介绍了整个系统的结构、功能和软件设计方法,给出了监测模块中需实时显示的被监测参数和故障诊断模块中可被识别的故障类型,为整机的正常运行提供了保障.     

工程机械ECU检修方法

针对ECU常见故障,结合工程机械使用条件,分析了故障机理,探讨了故障诊断方法,提出了检修要点。结果表明,9种检测诊断方法操作简便、可行,在检修过程中加以合理采用可以对ECU的故障进行有效诊断。     

基于共轨OBD系统的轨压传感器故障诊断研究

通过对高压共轨系统燃油喷射压力的特性研究,提出了轨压传感器相关故障的检测方案,包括轨压传感器开路故障、对电源短路故障以及漂移故障。设计了相应的诊断软件,并给出了保护策略,在柴油机上完成了各种轨压传感器故障诊断试验。试验结果表明,该诊断方法能有效地识别轨压传感器的各种相关故障,相应保护策略也能及时地起作用,达到了OBD系统应用要求。     

Fault detection and diagnosis of the electromechanical brake based on observer and parity space

In the future, the conventional hydraulic brake system in automobiles will be removed and replaced by an electrically operated brake system called brake-by-wire. The brake-by-wire units, such as the EMB (Electro-Mechanical Brake), provide better braking performance by directly controlling the brake motor and are environmentally friendly because they do not use hydraulic fluid. For implementation of the EMB systems, reliable and robust fault detection and diagnosis methods become increasingly important. In this study, a sensor fault diagnosis method is proposed with parity space and observer approaches to detect faults in the motor current sensor, speed (or position) sensor and clamping force sensor. The proposed method is verified through a closed-loop simulation using Matlab/Simulink, and the simulation result is compared with the HILS bench test results.     

高压共轨式电控柴油机电子油门故障自诊断策略研究

根据电子油门传感器的特点闸述了其故障自诊断的原理，介绍了电子油门诊断法中的极值诊断法和逻辑性诊断法，对油门传感器发生故障后的失效处理工作模式进行了讨论。建立了电子油门故障诊断的仿真模型，其仿真结果表明该控制策略能及时地发现故障。     

Integrated fault detection and diagnosis system for longitudinal control of an autonomous all-terrain vehicle (ATV)

This paper presents a fault detection and diagnosis (FDD) method to enhance the reliability and safety for longitudinal control of an autonomous all-terrain vehicle (ATV). An integrated approach using decentralized and centralized FDD is proposed to optimize the tradeoff between sensitivity and robustness. While the decentralized approach is suitable for detecting faults in actuators and sensors directly connected to a single processor, it is sensitive to noises and disturbances and thus may result in false alarms. On the other hand, the centralized approach is based on information communicated between multiple processors, and it detects and diagnoses faults through analyzing concurrent computations of multiple hardware modules. However, its performance is still limited to isolating faults specifically in terms of components in the single hardware. To incorporate the advantages of both FDD approaches, a two-layered structure integrating both decentralized and centralized FDD is proposed and allows us to perform more robust fault detection as well as more detailed fault isolation. Finally, the proposed method is validated experimentally via field tests of an ATV.     

高压互锁故障导致纯电动汽车不能上高压诊断分析

随着新能源汽车保有量不断增长,纯电动汽车日益普及,其故障诊断与维修也就越来越重要。文章通过长安CS15EV车型不能上高压故障,分析了高压互锁的作用及其相关故障检测诊断的方法。     

基于尾气分析的发动机故障诊断技术的研究与实践

车辆自诊断技术是诊断发动机故障的重要手段,然而对于发动机的机械故障和无故障信息存储的电气故障的诊断,自诊断技术则无能为力。尾气检测与分析技术为发动机多种疑难故障的诊断提供了有效途径。本文主要阐述了基于尾气检测与分析技术的发动机故障诊断的技术要点,诊断规律的试验研究及应用,旨在提高发动机故障诊断的有效性。     

Application of observer-based fault detection in vehicle roll control

This paper describes how observer-based techniques for intelligent fault detection were applied to monitoring an active suspension control system in an experimental articulated heavy vehicle. The aim was to define a practical method for detecting faults, taking into account the nonlinearities of the vehicle. The experimental vehicle was divided conceptually into subsystems, namely the passive dynamics of the trailer, the dynamics of the hydraulic actuators, and the expected response of the closed-loop system. A linear dynamic model was designed for each subsystem. A fault detection observer was then designed for each dynamic model. The observer feedback gains were chosen to optimise estimation by the observer residual of specified errors on the output measurements. The observer residuals were then normalised and combined logically to provide a fault diagnosis. The performance of the fault detection scheme is demonstrated in the case of sensor faults and changes in the operation of the active control system.     

Bootstrap法在车辆故障检测中的研究及应用

介绍Bootstrap方法的原理并将Bootstrap方法应用于检测车辆中存在的故障,通过计算不同故障下的车辆样本之间均匀Kullback-Lcible距离的均值以及在给定置信度下的置信区间等特征值来反映被测车辆的故障种类。给出一种新的随机数产生器用在Bcotstrap法重采样中产生新的随机序列。以车辆卜的驱动桥为检测对象对该算法进行了验证,结果表明该算法能准确检测出驱动桥所存在的故障。