三菱6G72型发动机燃油系统诊断代码及故障检查

三菱6G72型发动机诊断代码的读取可使用专用的测试表或用模拟电压表,根据电压表指针振幅信号来读取故障码。下面介绍如何使用模拟电压表读取故障码。读取故障诊断码时,首先要保证电瓶电压在12V,电压低时,任何故障将无法检测。诊断输出端子如图1。表1 故障代码及检查内容代码检查内容 12气流传感器线束及接头故障,传感器故障 13进气温度传感器线束及接头故障,传感器故障 14节气门位置传感器故障,线束及接头故障,怠速位置开关故障 21冷却液温度传感器线束及接头故障,传感器故障 22曲轴转角传感器线束及接头故障,分电器故障 23上止点传感器线…     

玉柴YC6J系列发动机结构特点及常见故障判断与排除

<正>二、玉柴YC6J系列发动机的常见故障及排除方法1.故障指示灯及故障码玉柴YC6J系列发动机的故障码是通过发动机故障指示灯来显示的。发动机故障指示灯位于驾驶室前面板处。打开点火开关,按下发动机故障检测开关,在发动机无故障的情况下,发动机故障指示灯应该为闪亮,断开发动机故障检测开关,发动机故障指示灯应该熄灭。     

电喷发动机故障诊断中的错误信息

电控汽车故障自诊断系统．一般有电子控制器fECU）中的识别故障及故障运行控制软件、故障监测电路和故障运行后各电路等组成。不同厂家生产的汽车,其故障自诊断系统的故障检测项目不尽相同,故障代码储存和显示方式也有所不同。     

低压配电系统中接地故障的产生及防范

本文论述了低压系统接地故障的成因及保护,阐明了造成接地故障引发电击及火灾事故的原因,提出了接地故障引发电击及火灾事故的防范措施。     

富康轿车发动机电控系统故障诊断

详细介绍采用故障代码查询法、技术参数检测判断故障法、查故障征兆一览表法及故障征兆模拟法,对富康轿车发动机电控系统故障进行诊断。     

赛欧C16NE型发动机曼控燃油喷射系统的故障诊断（二）

2．3故障代码（DTC）及故障排除方法 赛欧轿车发动机电控燃油喷射系统故障代码及故障排除方法如表1所列。     

红旗CA7220E轿车发动机电喷系统故障诊断

介绍红旗CA7220E轿车发动机电控系统故障码读取,故障码清除及故障排除实例。     

轿车防抱死制动系统的维护

轿车防抱死制动系统的故障主要分为制动器故障、制动压力调节器故障、车轮速度传感器故障及ABS/ASR电脑故障.     

电子信号在汽车故障诊断中的应用

汽车上的电子信号隐含着汽车的某些故障,特别是对于一些间歇性故障、机械式反馈系统故障及由传感器特性变化引起的故障,通过分析被检电子信号的特征可以快速、准确地诊断故障产生的原因及部位。介绍了汽车电子信号的种类及如何运用各类电子信号的特征诊断故障。实践证明,这种方法是行之有效的。     

FMS故障分析

本文建立了FMS故障部位及故障模式分类表，针对CH-85 FMS的运行故障数据，对其主要系统单元进行了故障分析，确定了CH-85 FMS各系统单元的主要故障模式及薄弱环节。     

混合动力汽车AMT系统故障诊断研究

以CA6124SH8混合动力汽车上匹配的CA-85HPT2 AMT为研究对象,根据解析冗余、故障树分析、基于系统动作反馈等原理,运用Matlab/Simulink搭建AMT系统故障诊断模型,再以混合动力汽车远程监控数据采集系统采集实车运行数据作为仿真模型输入参数,通过读取模块将参数输入诊断模型中,从而判断AMT系统各个单元故障情况。试验结果证明了故障诊断的准确性,对今后解决匹配AMT系统的混合动力汽车高故障率问题意义重大。     

Degree of fault isolability and active fault diagnosis for redundantly actuated vehicle system

This paper proposes á degree of fault isolability concept and active fault diagnosis method for redundantly actuated vehicle systems. Fault isolability is a structural property related to system dynamics and composition of actuators and sensors. Existing research on testing fault isolability has involved checking whether the system is isolable, i.e., binary in nature. A continuous value rather than a binary metric is needed to evaluate how isolable a given system fault is based on a specific measurement set. After fault components are isolated, the fault type and magnitude are estimated by analyzing residual vectors. In a redundantly actuated system, the number of controls/actuators is greater than the system mobility. Thus, the control input distribution to achieve a given control objective is not unique. In the case of a fault, the active fault diagnosis system adjusts the control input distribution to diagnose the fault. Thus, much more system information can be identified by additional excitation through a redundantly actuated system, which improves the fault diagnosis performance. Simulation results of a four-wheel independently driven and steered vehicle model validated the proposed degree of fault isolability and the effectiveness of the proposed active fault diagnosis method.     

推土机液压系统故障树分析

采用故障树分析法，对ＴＹ１２０推土机液压系统故障原因进行分析，为提高液压系统的可靠性提出有效的措施     

基于CAN总线的汽车故障诊断系统研究与设计

介绍了基于CAN的车载故障诊断标准ISO15765的体系结构,分析了ISO15765网络层的数据传送方式,在此基础之上设计了基于CAN网络的故障诊断系统及控制器故障诊断代码,完成诊断系统的硬件设计及软件调试,并利用CANoe软件对ECU和诊断设备进行测试。     

基于时序-神经网络的车辆变速器齿轮故障诊断

采用时序分析和BP神经网络，建立了基于时序-神经网络的车辆变速器齿轮故障诊断系统。通过对车辆变速器齿轮运行状念特征信号进行时序分析和特征向量提取，并以此作为BP神经网络的输入向量进行网络训练，从而实现变速器齿轮运行状态的识别与故障诊断。该系统应用于LC5T81变速器齿轮的故障诊断中，能够比较准确地识别与诊断出变速器齿轮的跑合运行状态、磨损运行状态和故障运行状态。验证表明该诊断系统有效、可行。     

迈腾B8L轿车电动车窗故障诊断分析

文章以一汽大众2018款迈腾B8L2.0TSI轿车为例,分析电动车窗系统电路,并结合一起真实的故障案例,诊断分析出故障原因,为汽车类似的系统故障诊断分析提供一定的参考。     

On fault isolation for rail vehicle suspension systems

Reliability of the railway vehicle suspension system is of critical importance to the safety of the vehicle. It is very desirable to monitor the health condition and the performance degradation of the suspension system online, which offers the important information of the suspension system and is critically important for the condition-based maintenance rather than scheduled maintenance in the future. Advanced fault diagnosis method is one of the most effective means for the health monitoring of the suspension system. In this paper, taking the lateral suspension system as an examcple, the fault isolation issue for different component faults occurring in the suspension system is concerned. The sensor configuration for obtaining the vehicle state information and the mathematical model for the lateral suspension system are presented. Four fault features in the time domain and three fault features in the frequency domain are used for each sensor signal. Three different methods, Dempster–Shafer (D–S) evidence theory, Fisher discrimination analysis (FDA) and support vector machine (SVM) techniques are applied to the fault isolation problem. Simulation study is carried out by means of the professional multi-body simulation tool, SIMPACK. The simulation results show that these methods can isolate the considered component faults effectively with a high accuracy. The D–S evidence-based fault isolation approach outperforms the other two methods.     

纯电动汽车动力系统故障分析

随着新能源汽车的发展,纯电动汽车的市场保有量愈来愈高,随着而来的新能源汽车后服市场也逐渐新起。纯电动汽车动力系统是纯电动汽车的核心部件,包括能源系统和驱动系统两个大的子系统。能源系统的主要组成部分为动力电池和动力电池管理系统。驱动系统的主要组成部分为驱动电机及电机控制器。文章归纳总结了动力系统的故障现象,对现象进行故障等级和故障类型的划分。并选取了三个典型案例进行故障排除,为维修人员提供参考。     

第2代车载故障诊断系统

介绍了美国和欧洲第2代车载故障诊断系统OBD—Ⅱ的基本内容和主要特点，对照说明了美国和欧洲各自系统中的相应标准、通讯协议、故障代码定义和结构，简要叙述了车载故障诊断系统的发展趋势。     

Fault-tolerant control of heavy-haul trains

The fault-tolerant control (FTC) of heavy-haul trains is discussed on the basis of the speed regulation proposed in previous works. The fault modes of trains are assumed and the corresponding fault detection and isolation (FDI) are studied. The FDI of sensor faults is based on a geometric approach for residual generators. The FDI of a braking system is based on the observation of the steady-state speed. From the difference of the steady-state speeds between the fault system and the faultless system, one can get fault information. Simulation tests were conducted on the suitability of the FDIs and the redesigned speed regulators. It is shown that the proposed FTC does not explicitly worsen the performance of the speed regulator in the case of a faultless system, while it obviously improves the performance of the speed regulator in the case of a faulty system.