共查询到20条相似文献,搜索用时 93 毫秒
1.
故障现象:一辆2004年生产的上海通用别克商务车,装配LWG型3.0L 6缸发动机,行驶里程25.6万km。该车在一般加速和急加速时发动机有“缺火”现象,只有非常小心地缓慢加速才没有“缺火”现象。 相似文献
2.
车型:A4L(B8)。行驶里程:137360km。故障现象:怠速发动机抖动严重,发动机故障灯亮。故障诊断:首先验证故障现象。车辆行驶到车间,怠速状态时发动机类似缺缸,严重抖动,加速正常。用诊断仪检测进入发动机系统查看故障码:油轨压力高。读取数据流发现不正常数据:(1)燃油压力20000kPa;(2)燃油泵负荷89.999%;(3)4个缸都有缺火记录。 相似文献
3.
一辆奥迪A6轿车,装备APS型V6电喷发动机,排量为2.4L,行驶里程5万km。据客户反映,该车早上起动时发动机抖动、加速无力且容易熄火,其现象类似于个别缸“缺火”。接车后进行试车,发现此车还有加速“回火”现象,并且发动机转速表指针上下摆动。当发动机达到正常工作温度后,上述故障现象消失。 相似文献
4.
<正>故障现象一辆长安福特公司2007年5月生产的三厢MT舒适型福克斯,排量1.8 L,发动机型号L4 CAF483Q0,行驶里程约15万km,发动机故障灯亮(图1)。故障诊断与排除读取故障码,显示为P0302(2缸缺火),气缸缺火是指发动机工作过程中由于各种原因造成的混合气在气缸内不能正常燃烧的现象。发动机控制模块ECM通过监测各缸曲轴转速的变化,可以监测到各个缺火事件,并且使用凸轮轴位置传感器的信息确定哪个气缸缺火。如果ECM检 相似文献
5.
6.
8.
<正>VIN:LFV3A23C7730XXXXX。行驶里程:50035km。故障现象:一辆迈腾1.8T自动舒适型轿车,车主反映该车在怠速的时候发动机抖动厉害,并且伴有异响。故障诊断:维修人员启动发动机,发现发动机怠速抖动严重,似有缺缸故障,发动机上部偶尔发出"唧唧"的异响。维修人员怀疑发动机怠速异响与抖动现象有关,首先使用诊 相似文献
9.
正故障现象一辆2014款东风悦达起亚智跑,搭载G4NA2.0L型发动机,行驶里程为66 539km。据车主反映,该车发动机故障灯常亮,且行驶过程中感觉加速无力,另外,等红灯怠速时发动机偶尔会熄火。故障诊断与排除接车后,技师与车主一起试车,未发现发动机加速无力和怠速熄火的现象,但仪表台上的发动机故障灯常亮。 相似文献
10.
故障现象:一辆2007年产天津一汽威志轿车,行驶里程4000km,搭载4GB2型1.6L发动机。在正常行驶中,仪表板上的发动机故障灯突然点亮。 相似文献
11.
12.
13.
首先介绍了CFD技术的概念,然后对某发动机进气歧管进行了CFD分析,指出了设计中存在的问题,最后提出优化方案,并对优化方案进行了分析。 相似文献
14.
乌苏大桥主桥为独塔单索面斜拉桥,跨径布置为(140+140)m,采用塔、墩、梁固结体系,综述该桥上部结构设计与计算。主梁为带大挑臂的钢箱结合梁,中间钢箱梁采用单箱双室截面,两侧钢挑臂为变高度工字形梁,挑臂端部设槽形小纵梁;混凝土桥面板厚25 cm,与钢梁通过剪力钉连接;塔根部主梁采用预应力混凝土箱梁,以方便与桥塔固结;桥塔采用独柱式塔,高117 m;斜拉索为竖琴形中央平行索面布置,采用低松弛镀锌高强度平行钢丝束。采用有限元软件MIDAS Civil 2006及SCDS程序对该桥进行结构计算分析,结果表明该桥的静力、稳定及动力特性均满足规范要求。 相似文献
15.
16.
17.
18.
19.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):895-923
The curving performance of a transit rail vehicle model with 21 degrees of freedom is optimized using a combination of multibody dynamics and a genetic algorithm (GA). The design optimization is to search for optimal design variables so that the noise or wear, arising from misalignment of the wheelsets with the track, is reduced to a minimum level during curve negotiations with flange contact forces guiding the rail vehicle. The objective function is a weighted combination of angle of attack on wheelsets and ratios of lateral to vertical forces on wheels. Using the combination of the GA and a multibody dynamics modelling program, A’GEM, the generation of governing equations of motion for complex nonlinear dynamic rail vehicle models and the search for global optimal design variables can be carried out automatically. To demonstrate the feasibility and efficacy of the proposed approach of using the combination of multibody dynamics and GAs, the numerical simulation results of the optimization are offered, the selected objective function is justified, and the sensitivity analysis of different design parameters and different design parameter sets on curving performance is performed. Numerical results show that compared with suspension and inertial parameter sets, the geometric parameter set has the most significant effect on curving performance. 相似文献
20.
Yuping He John McPhee 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2005,43(12):895-923
The curving performance of a transit rail vehicle model with 21 degrees of freedom is optimized using a combination of multibody dynamics and a genetic algorithm (GA). The design optimization is to search for optimal design variables so that the noise or wear, arising from misalignment of the wheelsets with the track, is reduced to a minimum level during curve negotiations with flange contact forces guiding the rail vehicle. The objective function is a weighted combination of angle of attack on wheelsets and ratios of lateral to vertical forces on wheels. Using the combination of the GA and a multibody dynamics modelling program, A'GEM, the generation of governing equations of motion for complex nonlinear dynamic rail vehicle models and the search for global optimal design variables can be carried out automatically. To demonstrate the feasibility and efficacy of the proposed approach of using the combination of multibody dynamics and GAs, the numerical simulation results of the optimization are offered, the selected objective function is justified, and the sensitivity analysis of different design parameters and different design parameter sets on curving performance is performed. Numerical results show that compared with suspension and inertial parameter sets, the geometric parameter set has the most significant effect on curving performance. 相似文献