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电喷发动机电子控制系统故障复杂,常常表现为多因多果。文中用虚拟仪器技术LABVIEW对传感器进行信号采集处理,利用BP神经网络对电喷发动机控制系统单一故障对应的可能故障原因进行判断,同时用BP神经网络对采集的传感器信号进行处理,诊断出传感器故障类型,最后,将两者结合确定出故障现象与故障原因的实际对应关系。本系统为由传感器引发的电喷发动机故障的诊断提供了一种有效方法。 相似文献
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故障现象一辆悦达起亚出现怠速“游车”故障。该车装用的是1.3L电喷发动机。接车后,检测故障码,显示系统正常。故障诊断及排除该车采用的是一个三线旋转阀的怠速阀。试着轰了几次油门后,游车故障现象消失,估计可能是怠速阀的阀芯脏污卡滞引起。正常工作状态下,该阀是不断振动的 相似文献
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随意搭铁试火判断故障电控系统本身故障并不多见,出现故障往往是由电路接触不良引起。个别驾驶员对于电喷汽车故障排除方法知之甚少,仍然采用过去传统的故障诊断方法,随意搭铁试火,这种检测方法极易造成电控系统自诊断记忆编码自动丢失,也容易烧坏机件,给检修工作增加困难,造成 相似文献
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随着我国汽车工业的发展,现在装有电喷发动机的轿车越来越多。电喷发动机的轿车不仅动力性、经济性、排放性得到了改善,而且行驶安全、可靠、具有维护工作量较少的特点。在一般情况下很少出现故障,一旦出现故障需要维修时,必须具有一定的专业知识和掌握必要的检测方法。现代电喷发动机轿车都具有故障自诊断功能,当系统出现故障时,将故障信息存入存储器中,然后通过一定的程序将故障以代码的形式调出,并显示故障的性质和部 相似文献
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数据流和波形分析诊断故障法是排除电喷发动机故障的基本方法。由于这种方法需要一定的理论基础和一些必要的技术数据,所以在排除一般电喷发动机故障时采用的较少,而大都用在排除电喷发动机的疑难故障上。 相似文献
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捷达SDI(非增压直喷)柴油机,采用转子泵喷油嘴式柴油电喷系统。由于柴油车省油,中、低速扭矩大,所以大部分作城市出租车。由于城市出租车日行程很大,进入市场也只有1~2年的捷达柴油车,已行驶了10~20万千米,故障日益增多,广大汽车维修技师迫切需要这方面的维修资料。如同汽油机电喷系统那样,柴油机电喷系统的自诊断对诊断故障有着极为重要的作用,现将捷达(1.9L)柴油机柴油电喷系统的自诊断介绍给广大维修技师,以用于修理。一、自诊断系统功能简介柴油机电喷系统的控制单元中设置有一个故障存储器,如果被监测的传感器或执行元件出故障时,… 相似文献
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一款试制发动机下线检测时发现起动困难,故障原因为失火,故障率百分之五十以上。该发动机搭载某款电喷系统,该电喷系统要求:当发动机转速为300 r/min时,磁电机的触发信号幅值大于2.2V。本文从触发信号出发分析了失火原因,改进磁电机设计,解决了发动机起动困难问题。 相似文献
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电喷发动机怠速性能的好坏对发动机的正常工作有着直接的影响。主要从最低稳定转速的检测项目和快怠速系统的检查内容说明了电喷发动机怠速系统正常运转的工作条件及检测手段,并以实例说明了典型怠速故障的诊断。 相似文献
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利用Q480电控汽油机的相关参数和试验数据,建立了进气管空气动态模型;结合信号特征比较法和进气管空气动态模型设计出适合于电控汽油机进气系统传感器的故障诊断策略和故障应急管理策略;最后,将自主研发的带有进气系统传感器故障诊断和故障应急管理策略的控制单元安装到整车上进行试验,试验结果证明了故障诊断策略的正确性和故障应急策略的可行性。 相似文献
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电控柴油机的优化标定 总被引:2,自引:1,他引:2
电控共轨系统的共轨压力和喷油量能够进行独立控制,因此它具有传统燃油喷射系统所无法比拟的优势。运用Matlab的Cag。软件对高压共轨电控柴油机进行了标定,使其在尽可能减小NOx排放的基础上,增大扭矩,从而达到提高动力性的目的。 相似文献
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J. Benajes S. Molina R. Novella R. Amorim H. Ben Hadj Hamouda J. P. Hardy 《International Journal of Automotive Technology》2010,11(2):139-146
The demand for reduced pollutant emissions has motivated various technological advances in passenger car diesel engines. This
paper presents a study comparing two fuel injection systems and analyzing their combustion noise and pollutant emissions.
The abilities of different injection strategies to meet strict regulations were evaluated. The difficult task of maintaining
a constant specific fuel consumption while trying to reduce pollutant emissions was the aim of this study. The engine being
tested was a 0.287-liter single-cylinder engine equipped with a common-rail injection system. A solenoid and a piezoelectric
injector were tested in the engine. The engine was operated under low load conditions using two injection events, high EGR
rates, no swirl, three injection pressures and eight different dwell times. Four injector nozzles with approximately the same
fuel injection rate were tested using the solenoid injection system (10 and 12 orifice configuration) and piezoelectric system
(6 and 12 orifice design). The injection system had a significant influence on pollutant emissions and combustion noise. The
piezoelectric injector presented the best characteristics for future studies since it allows for shorter injection durations
and greater precision, which means smaller fuel mass deliveries with faster responses. 相似文献
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C. B. Yin Z. D. Zhang N. L. Xie Y. D. Sun T. Sun 《International Journal of Automotive Technology》2016,17(4):591-604
In this paper, knocking combustion in dual-fuel diesel engine is modeled and investigated using the CFD code coupled with detailed chemical kinetics. The ethanol/gasoline blend E85 is used as the primary fuel in a dual-fuel combustion concept based on a light-duty diesel engine equipped with a common-rail injection system. The E85 blend is injected and well mixed with intake air in the intake manifold and is ignited by the direct injection diesel fuel. A 46-species, 187-reaction Multicomponent mechanism is adopted to model the auto-ignition process of the E85/air/diesel mixture ahead of the flame front. Based on the model validation, knocking combustion under boost and full load operating condition for 0 %, 20 %, 50 %, as well as 70 % E85 substitute energy is simulated. The effects of E85 substitute rate and two stage injection strategies on knock intensity, power output, as well as location of the auto-ignition initiation is clearly reproduced by the model. The calculation result shows that, for a high E85 rate of 50 % and 70 % with single injection strategies, the most serious knock and the origin of auto-ignition always occurs far away from where the flame of diesel spray is first generated, at the center of combustion chamber, due to higher pressure wave, relatively richer E85 mixture and longer distances of flame propagation. The two stage injection strategies with a small amount of diesel pilot injection ahead of the main injection primarily influence the ignition behavior of the directly injected fuel, leads to a lower pressure rise rate and a reduced propagation distance, both of which contribute to the attenuation of knock intensity for a higher E85 rate. 相似文献
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LPG系统匹配试验研究 总被引:1,自引:0,他引:1
用气体燃料代替汽油,是目前解决城市空气污染的一个可行方法。为减少改装成本,气体燃料系统多采用通用型的减压蒸发器和人工调整的功率调节器,而混合器则采用结构简单的文丘里式。但减压蒸发器和混合器中的设计是各自独立进行的,因而存在着匹配上的问题。虽然功率调节器可对某一工况进行调整。但对其它工况则无能为力。使用液化石油气(LPG),就东风6100汽油机与我国应用较广的国外某公司的减压蒸发器与上述的混合器和功率调节器做了匹配试验。从中发现,从怠速到最大负荷等多种工况,发动机性能均未处于最佳的工作状态。本文就这些问题产生的原因及解决的办法分别进行了论述。 相似文献