轿车汽油机稀燃与发动机柴油化

介绍了轿车汽油机稀燃与发动机柴油化,详细叙述了汽油机实现稀燃的关键技术和轿车用发动机柴油化的技术特点,指出汽油机稀燃与发动机柴油化是轿车发动机节能的最佳措施和手段。     

上海桑塔纳轿车用户来函询问解答

(续二) 9.桑塔纳轿车发动机正常工作水温应是多少度? 答:桑塔纳轿车发动机是水冷式发动机,只要发动机冷却系统无泄漏、节温器与散热风扇正常工作,水温范围从80℃～105℃。这个温度比一般轿车发动机偏高。     

卡罗拉轿车发动机介绍与维修

卡罗拉轿车作为一款市场用户较多的车型,维修市场份额极大。对于相关汽车专业学生而言,全面掌握卡罗拉轿车发动机原理,把握相关的检测、维修的技巧方法,可以有效提高卡罗拉轿车检修的效率,提高卡罗拉轿车维修的能力和水平。一、卡罗拉轿车发动机基本介绍卡罗拉轿车发动机采用了可变气门正时技术,该技术可以提高进气     

奥拓车故障诊断集锦

奥拓微型轿车启动机有撞击声且不能启动发动机；奥拓微型轿车汽车曲轴轴承异响；奥拓微型轿车转向信号灯不亮；奥拓微型轿车不能发动；奥拓微型轿车接通启动开关后，发动机熄火；奥拓微型轿车发电机不正常；奥拓微型轿车启动机不能运转；奥拓微型轿车启动机运转无力，带不动发动机。     

轿车发动机节能新方法—汽油机稀薄燃烧和发动机柴油化

介绍了轿车用发动机节能的新方法－汽油机稀薄燃烧和发动机柴油化，详细地叙述了汽油机实现稀薄燃烧的关键技术和轿车用发动机柴油化的技术特点，指出汽油机稀薄燃烧及发动机柴油化是轿车发动机节能的最佳措施和手段。     

北京现代途胜轿车点火电路及喷油电路故障分析

北京现代途胜轿车采用的是直列4缸4冲程发动机,本文通过对北京现代途胜轿车电控发动机进行试验,对其喷油电路、点火电路及喷油、点火共用电路出现的故障进行详细的分析,并对该型号发动机喷油电路、点火电路所引起的发动机怠速不稳,加油不顺;发动机无法启动等故障进行详细分析。现代途胜轿车电控发动机喷油、点火电路如图1所示。     

电喷发动机启动困难故障三例

例一：帕萨特B5轿车停放后发动机启动困难 故障现象：一辆帕萨特B5轿车,在早晨启动时,发动机难以启动,多次启动后,发动机才着车。     

迈腾B7L车辆发动机故障案例分析

文章主要阐述了一汽大众迈腾B7L轿车发动机系统故障案例,图文并茂展示了迈腾B7L轿车发动机系统故障排除思路及控制逻辑,针对汽车发动机起动机无法运转、发动机无法起动典型案例进行分析,为汽车维修技术人员、职业院校师生提供了参考依据。     

发动机故障灯时亮时灭的检修思考

最近,本修理部检修了两辆发动机故障灯时亮时灭的轿车,一辆是羚羊轿车,另一辆是奇瑞轿车。下面笔者简单介绍一下对这两辆车的检修过程,然后谈谈对此次检修的思考。这两辆轿车送来修理时,发动机故障灯均点亮着,经试车发现,发动机怠速不稳,加速无力。用故障检测仪进行检测,调得的故障代码均显示两辆车的氧传感器和空气流量传感器存在故障。询问羚羊轿车的驾驶人得知,该车的     

东南菱帅车发动机电控单元的修复

1故障现象 一辆2005年产东南菱帅轿车，行驶中发动机突然无力，减速后熄火；重新起动发动机，发动机难以起动着，勉强起动着后，抖动厉害，轿车无法行驶。     

发动机结构噪声的计算机仿真分析

以一台四缸发动机为例,应用计算机仿真技术分析了发动机的结构振动噪声。首先建立发动机总成有限元模型,通过模态分析,为发动机的结构修改提供依据。根据车用发动机的实际使用工况,在不同转速及爆发压力下对其进行动力学计算,得到发动机的表面振动速度级。通过改进发动机结构,使发动机的表面振动速度级降低了5.6dB(A)。     

Integration of a single cylinder engine model and a boost system model for efficient numerical mapping of engine performance and fuel consumption

A numerical engine mapping methodology is proposed for the engine performance and fuel consumption map generation. An integrated model is developed by coupling a single cylinder GT-Power® engine model with a MATLAB/ Simulink® based boost system model to simulate a turbocharged diesel engine over the entire engine operating speed and load ranges within reasonable computational constraints. A single cylinder engine model with the built-in multi-zone combustion modeling option in GT-Power® is configured as a predictive engine model. The cycle averaged simulation result from the engine model is used as the boundary conditions of the boost system including intake and exhaust manifolds and a turbocharger. The boost system model developed in MATLAB/Simulink® platform calculates the intake and exhaust conditions which are fed back to the engine model. The integrated system model predicts the performance and fuel consumption of a turbocharged diesel engine with better predictive capability than mean value engine models. Its computational time is fast enough to simulate the engine over the entire engine operation range compared to multi-cylinder engine models.     

Mean Value WGT Diesel Engine Calibration Model for Effective Simulation Research

Recently, to improve vehicle fuel economy, as well as the performance of internal combustion engines, optimized system matching between a vehicle’s drivetrain and engine has become a very important technical issue. For this reason, the need for simulation research on engine and vehicle performance improvement has increased. But in general, since both engine simulation and vehicle simulation require initial engine calibration map input, a simple engine calibration method is required for the efficient configuration of various virtual engine calibration map setups. On this background, in this study, an example of waste gate turbocharger (WGT) cooled — exhaust gas recirculation (EGR) Diesel engine calibration using a test-based mean value engine model is presented as a suitable engine calibration map setting method. Also, the feasibility of an engine calibration model is confirmed through various engine tests. Using the simple model presented here, it is possible for diverse engine operating conditions and engine performance maps to be acquired.     

CNG发动机和汽油机燃烧的比较分析

CNG发动机与汽油机的燃烧同为预混湍流燃烧,但火焰传播速度、着火延迟期及混合气热值均不同。为在汽油机上改燃CNG或CNG/汽油两用燃料发动机发挥CNG燃烧的优点,针对CNG燃烧特点设计发动机,才能达到较高的输出功率和较低的排放。     

乙二醇型汽车发动机冷却液的检测和正确使用

发动机的正常运转与发动机冷却液密不可分,本文主要探讨了乙二醇型汽车发动机冷却液的科学检测和正确使用。发动机冷却液,俗称防冻液,是发动机正常运转不可缺少的散热介质,能保持发动机在最有利的工作温度范围内运行,避免因发动机温度过高或过低带来的不良后果。根据发动机运行的情况对冷却液进行科学的检测、正确的使用和更换会直接影响发动机的使用寿命。     

二甲醚发动机活塞温度的测量研究

用硬度塞法分别测量了相同工况下二甲醚(DME)发动机和柴油机的活塞温度分布,测量结果表明,90%标定负荷工况时,DME发动机活塞顶部和火力岸处表面温度为255℃～290℃,比同工况下柴油机要低20℃～40℃,燃用这两种燃料的活塞温度分布情况及其变化趋势则基本相同。采用零维燃烧模型对DME发动机与柴油机的燃烧放热规律和缸内温度变化历程进行了预测分析,计算结果表明,在相同工况下DME发动机的热负荷低于柴油机,这是导致DME发动机活塞温度较柴油机低的根本原因。     

混合动力汽车发动机起动/停机控制

介绍了采用继电器对发动机管理系统ECU的工作进行控制,同时针对发动机管理系统原有的减速断油模式进行了重新标定,实现了发动机高转速起动功能,且降低了停机时的转速,避免了对发动机ECU频繁的通/断电操作及因频繁起动造成的发动机燃油消耗率和排放性能的不良影响。     

气门非配对研磨技术在汽车发动机故障检测中的应用研究

发动机作为汽车的一个重要组成部件,其稳定运行是保证汽车正常行驶的关键,因此,对发动机的故障检测也成为了汽车日常维修处理的一个重要环节,本文针对汽车发动机检修,探讨在汽车发动机故障检测中如何充分利用气门非配对研磨技术,对提高汽车发动机修理水平,确保汽车发动机故障维修质量具有非常重要的意义.     

Effect on friction of engine oil seal with engine oil viscosity

Low viscosity engine oil can improve a vehicle’s fuel economy by decreasing the friction between the engine components. Frictional torque varies with the velocity change due to different viscosity characteristics of SAE grade 5W-20, 5W-30 and 5W-40 engine oils. The viscosity for each of these grades was measured to outline the effect low viscosity engine oils have on engine friction, which may lead to improved fuel economy. Engine oil seal frictional torque increases with the shaft rotational speed for all three engine oil grades. A decrease in engine oil seal frictional torque was confirmed when low viscosity engine oil was used. Also, the leak-free performance of the engine oil with the seal satisfied the life limit durability test criteria. Thus, low viscosity engine oil may be used to improve fuel economy by decreasing the frictional loss of the engine oil seal while having no negative impact on performance due to leak-free functioning.     

基于振动信号的发动机转速测量研究

介绍一种基于发动机气缸振动信号测量转速的方法.通过采集发动机气缸内部混合气燃烧时的振动信号,利用Labwindows/CVI软件对信号进行频谱分析、低通滤波,结合发动机的振动源以及发动机振动与转速之间的关系,得出发动机的转速.试验证明,此测试方法具有较高的精度.