汽车电控发动机的故障诊断方法研究

<正>随着发动机电控技术的发展,电控发动机的故障诊断越来越抽象化。这要求维修人员除了要掌握较强的电控技术理论知识外,学会一些电控发动机的故障诊断方法也是十分必要的。本文归纳总结了几种汽车电控发动机的故障诊断方法。一、直观诊断法所谓直观诊断法,就是不用任何的仪表、设备,通过人的感觉器官对车辆故障进行诊断,通过人的大脑进行分析、判断得出结论、找出故障的诊断方法。在汽车维修中最常用的直观诊断方法有"看、问、闻、听、试",这     

传统故障诊断方法在当代汽车故障诊断中的应用

高档轿车保有量正大幅度增加,各种先进的仪器及检测诊断设备层出不穷,采用仪器诊断已成为故障诊断的重要手段。但是,仪器诊断也有其缺陷,如成本高、对操作人员的文化水平要求高、对某些故障(如线路故障)的诊断效率低,以致于造成误判,给车辆故障诊断带来了困难。因此,充分利用成熟的维修经验,与传统的诊断方法——"问"、"看"、"听"、"闻"、"试"、"摸"相辅相成提高维修效率是汽车维修中不可缺少的组成部分。     

基于PNN的发动机PT燃油系统故障诊断

针对传统故障诊断方法的局限性,提出了基于PNN的故障诊断方法,并以发动机的PT燃油系统为例,进行了故障诊断研究;通过与常用的BP神经网络进行对比试验,验证了基于PNN的故障诊断方法的有效性.     

思维方法与汽车故障诊断(七)--汽车故障诊断方法概述

在现代汽车维修领域里我们常听到“汽车医生”一词,我理解“汽车医生”主要是汽车故障诊断过程与医生看病过程是一样的原因。我在插队的时候做过两年赤脚医生,学的是中医,中医的“望、闻、问、切、诊”在我后来的汽车维修工作中起了非常大的作用。“望”,主要是观察故障车的异常现象和异常程度;“闻”,耳闻主要是听一听有无异常响声和响声部位,鼻闻主要是闻一闻有无异味;“问”,主要是询问故障发生的客观条件和现象、特点;“切”,主要是感觉一下故障点的温度变化,初步确定故障所属哪个系统;“诊”,主要是借助于经验与仪器进行综合会诊。另外…     

中职汽车故障诊断教学中“破冰式”策略的运用研究

<正>当前,我国汽车保有量已经达到2亿辆,这给汽车维修服务行业带来了新的机遇与挑战,同时对汽车维修人员的汽车故障诊断的能力要求也越来越高。我们在汽车故障诊断教学中不断进行探究,创新性地运用了"破冰式"策略。通过对汽车故障诊断教学各个方面运用"破冰式"策略,培养出能够适应现代汽车维修企业所需要的汽车维修人才。1汽车故障诊断教学中存在的问题及原因分析要学好汽车故障诊断,要求学生在全面掌握《汽车发     

基于信息融合的发动机故障诊断技术研究

针对传统发动机故障诊断方法的不足,采用了信息融合技术进行发动机故障诊断,并通过实例验证了该方法诊断发动机故障的精度。     

思维方法与汽车故障诊断（七）——汽车故障诊断方法概谜

在现代汽车维修领域里我们常听到“汽车医生”一词．我理解“汽车医生”主要是汽车故障诊断过程与医生看病过程是一样的原因。我在插队的时候做过两年赤脚医生，学的是中医．中医的“望、闻、问、切、诊”在我后来的汽车维惨工作中起了非常大的作用。“望”．主要是观察故障车的异常现象和异常程度；“闻”，耳闻主要是听一听有无异常响声和响声部位，鼻闻主要是闻一闻有无异味：“问”．主要是询问故障发生的客观条件和现象、特点；“切”．主要是感觉一下故障点的温度变化．初步确定故障所属哪个系统；“诊”．主要是借助于经验与仪器进行综合会诊。     

数据流在电控汽车故障诊断中的应用

介绍应用数据流对电控汽车燃油喷射系统进行故障诊断的方法,通过3个实例阐述了数据流功能在电控汽车故障诊断中的应用。     

马自达汽车控制区域网络(CAN)相关故障诊断

正随着汽车电子技术的发展和对汽车性能要求的提高,汽车上装配的电控单元的数量越来越多,各个电控单元之间都通过CAN、LIN等类型的总线组成的网络来实现信息交换。随着网络化程度的提高,由此引发的故障也越来越多,CAN系统的故障诊断也日益受到技师们的关注。本文以马自达汽车为例,介绍CAN系统的故障诊断方法,希望能为解决此类问     

汽车发动机点火系统故障诊断方法

汽车发动机电子点火系统采用先进的电子控制技术后,改善并提高了汽车发动机的各项性 能,但电子点火系统一旦发生故障将直接影响车辆驾驶。为此,对汽车发动机电控点火系统的故障诊 断方法进行探讨,对其故障类型进行分析,明确了针对不同故障制定不同的维修保养措施,以期提升发动机点火系统的故障诊断效率,保障汽车行驶的安全性。     

Measurement of soot oxidation with No<Subscript>2</Subscript>-O<Subscript>2</Subscript>-H<Subscript>2</Subscript>O in a flow reactor simulating diesel engine DPF

Understanding the mechanism of carbon oxidation is important for the successful modeling of diesel particulate filter regeneration. Characteristics of soot oxidation were investigated with carbon black (Printex-U). A flow reactor system that could simulate the condition of a diesel particulate filter and diesel exhaust gas was designed. Kinetic constants were derived and the reaction mechanisms were proposed using the experimental results and a simple reaction scheme, which approximated the overall oxidation process in TPO as well as CTO. From the experiments, the apparent activation energy for carbon oxidation with NO₂-O₂-H₂O was determined to be 40±2 kJ/mol, with the first order of carbon in the range of 10∼90% oxidation and a temperature range of 250∼500°C. This value was exceedingly lower than the activation energy of NO₂-O₂ oxidation, which was 60±3 kJ/mol. When NO₂ exists with O₂ and H₂O, the reaction rate increases in proportion to NO₂. It increases nonlinearly with O₂ or H₂O concentration when the other two oxidants are fixed.     

一汽“狂飙”

一汽人通过提升管理、加快产出,扩大销量,强化自主,扩大合作等一系列工作,赢得企业又好又快地新发展,使集团的销量、销售收入和利润登上历史的新巅峰。     

江腾一 茶道·车道·人间道

<正>19981998年,13岁的江腾一发现了自身具备的赛车手潜质,于是他开始了自己的卡丁车生涯,在当时他就已经被预言会成为一名成功的天才车手。20032003年,江腾一有幸参加丰田车队及PREMA POWER的雷诺方程式车队在意大利的试车,整个过程中他的表现让人惊喜,出乎所有技术人员的意料,本次试车的所有技术指数表明他是一个很有潜能和可造就的年轻车手。20072007年3月4日,江腾一同冠军方程式签约。次日,他飞往美国寻找自己的赛车之"道"。     

<TPL-PCRUN> Statement of methods

TPL-PCRUN is a software program for the dynamic interaction simulation of pantograph–catenary systems. In the benchmark, based on the finite element method, the catenary model was built and the pantograph was considered as a three-level spring–damper–mass system. Then, through the contact definition between pantograph and catenary, the coupled model of the pantograph and catenary system was established. The respective dynamic equations of motions were solved by the time integration method. Thus, the simulation results were obtained and submitted for the comparison with the other software. On the other hand, a standard model from EN50318 was established and analysed by TPL-PCRUN. The simulation results by TPL-PCRUN were remarkably consistent with the reference values given by EN50318. It was proved that the results by TPL-PCRUN can be reliable. Recently, the software has been updated and improved. Some new models and algorithms are proposed, including the rigid–flexible hybrid pantograph model, contact definition considering appearance characteristics of the contact surfaces, a fluid–solid coupling algorithm of the pantograph and catenary system, etc.     

汪玉春论“道”

当岁月将沧桑慢慢抹上他的额头与鬓角时,他的思想却日见成熟和丰满起来。对质量成本的密切关注,使得他成为了业内截至目前少有的精益推动者之一。     

Study of n-C<Subscript>12</Subscript>H<Subscript>26</Subscript> reforming over DFC catalyst in a simulated diesel exhaust

In lean-DeNOX catalysis reactions, hydrogen is a good reducing agent in PGM catalysts as well as an effective promoter in selective catalytic reduction reactions over base metal oxide catalysts. However, such a lean-DeNOX system, which uses hydrogen, requires an on-board fuel reforming system applicable to internal combustion engines. In this study, catalytic partial oxidation (CPOx) performance was tested in a laboratory for various reactants and hydrocarbon conditions. Volume concentrations of 5–10% oxygen and 0-5% water vapor were used to simulate diesel exhaust, and n-C₁₂H₂₆ was used as the feedstock for the reforming reaction. In the CPOx of n-C₁₂H₂₆, the highest hydrogen selectivity was 64% and was achieved at 100,000 h-1 GHSV. Additionally, the C/O ratio was less than unity in the absence of water vapor. However, as the water concentration was increased to 2.5 and 5.0 vol. % in the n-C₁₂H₂₆ CPOx reactions, the maximum hydrogen selectivity was increased from 64% in the absence of water to 70% and 75%, respectively. This effect is a consequence of the water-gas shift reaction over the catalyst bed. Regarding oxygen concentration effects, hydrogen selectivity slightly increased with increasing oxygen concentration from 10% to 15%. It was also found that the CPOx reaction of n-C₁₂H₂₆ can be ignited at temperatures below 300 C. Accordingly, it can be concluded that CPOx is a useful and feasible device for promoting diesel DeNOx catalysis in terms of hydrogen productivity and reaction initiation.     

他送“猛士”上战场——记东风汽车公司“猛士”总设计师黄松

2007年底,一款名为"猛士"的军用越野车正式装备部队,从此,中国有了堪与闻名于世的美国"悍马"相媲美的高性能军用越野车。该车的总设计师黄松成为公众关注的焦点。     

夺目双雄——三菱新型“Concept-RA”概念车与“Lancer Ralliart(蓝瑟)”

作为展示三菱汽车高新科技含量的载体,"Concept-RA"概念车以及"Lancer Ralliart (蓝瑟)"车,在动态的流线造型中将其中所蕴含的跑车理念与精益精神,淋漓尽致地展现在了世人面前。     

中国汽车“玲珑秀”

随着全球经济的高速发展,能源和环境问题日益突出,节约能源、保护环境已成为世界各国共同面临的重大挑战。利用电动自行车的产业优势,发展以电动微型车为主体的"个人轿车"非常符合中国国情。     

东风本田“绿色价值观”

诸多新技术、新系统的使用,使高品质、高效率的"绿色工厂"得以实现,充分体现出东风本田对社会、对未来的责任感和使命感。