具有自动泵油功能的滤清器设计原理

目前国内外市场上,柴油滤清器总成上集成的泵油装置全部为手动泵,必须用手向下压送手动泵盖,使泵室内的膜片上下运动,通过进油和出油两个单向阀的作用在泵室内形成真空,实现手动泵油功能;自动泵柴油滤清器具有自动泵油功能,可排空发动机燃油系统中的空气,自动将燃油从油箱泵至喷油器,实现泵油功能由电动代替手动,大大减轻了泵油的劳动强度,使产品更具加人性化。     

某燃油滤清器故障分析与改进

针对某工程机械用共轨柴油机在保养后无法起动问题,对燃油系统设计及故障排查过程进行介绍分析,从设计和操作过程等方面查找故障原因,并给出具体的解决方案。经排查,故障原因为燃油滤清器精滤芯底部密封圈尺寸不合理导致保养时精滤芯安装不到位,进而造成车辆无法起动。通过改进密封圈结构,可有效解决上述起动问题,为燃油滤清器的设计提供经验和指导。     

解决高压共轨柴油机燃油系统聚气引起汽车发动机熄火和起动困难的技术难题

本文是从解决某型汽车高压共轨柴油发动机起动困难的实践中总结而出。主要从燃油滤清器单一因素影响柴油发动机起动困难的原因进行分析,并给出改进措施,从而有效解决国四、国五燃油滤清器引起高压共轨柴油机熄火和起动困难的技术难题     

柴油机高压油泵柱塞副泄漏研究进展

高压共轨燃油喷射系统已发展为柴油机喷油系统的主流,其喷射压力的提高直接受到高压油泵泵油能力的制约。柱塞副泄漏是导致高压油泵容积效率降低、泵油能力下降的关键因素。从影响柱塞副泄漏的几个关键因素出发,概述相关研究的发展现状,总结该领域的理论研究和应用特点,提出现有研究存在的问题及未来可能的研究发展方向。     

汽车电动燃油泵失效模式分析

介绍汽车电动燃油泵的组成和工作原理,分析常见的电动燃油泵失效模式,如无燃油供应、泵油压力不足、供油压力偏低及供油量不足、输油管路无残余压力、供油不足时燃油泵发出尖叫声等失效模式。     

丰田5S-FE发动机燃油供给系无油压故障现象排除方法浅谈

<正>燃油供给系统简称供油系统,其功用是向发动机各个气缸供给混合气燃烧所需的燃油量。燃油喷射式发动机供油系统的结构主要由燃油箱、电动燃油泵、输油管、燃油滤清器、油压调节器、燃油分配管、喷油器和回油管等组成。燃油分配管又称为供油总管或油架。发动机工作时,汽油泵工作,将油箱内的燃油泵入供油系统,供油系统的油压由油压调节器调节,一般控制在     

燃油系统空气排放阀的制作与使用

1.燃油系统常规排气方法 柴油机燃油供给系统内部混入空气,可导致发动机不能正常工作。排除燃油供给系统内部空气的常规方法如下：打开喷油泵、柴油滤清器的排气螺塞,或者在拧松系统中位置最高的油路连接螺栓后,压动手油泵泵油,将系统中的空气挤出。直至溢出的柴油没有泡沫状油液后,拧紧排气螺栓或连接螺栓即可。     

6135型柴油机燃油系统的改进

国产某些型号的推土机以上柴6135型柴油机为动力,其燃油供油系统由带防盗加;Eh口的燃油箱、燃油液位计、燃油箱输出油管、柴油滤清器、停机手柄和熄火拉线等组成。燃油箱底部的输出油管经柴油滤清器与喷油泵连接以提供燃油,柴油机停机由停机手柄控制。     

康明斯柴油机系列讲座之八 康明斯柴油机燃油系统的构造与维修(三)

(四)VE型分配式喷油泵的维修1.VE分配泵的维护(1)每日首次启动前,应旋松油水分离器下端的放水阀,放出分离器的水,然后旋紧。如果气温低于0℃,应在每天收车后立即放水。(2)按规定保养燃油滤清器、燃油箱和输油泵与燃油箱之间的预滤器。更换旧燃油滤清器时,其中的燃油不得倒入燃油箱或新燃油滤清器内。安装新燃油滤清器时一定要加满清洁的燃油,否则燃油系中进气后,将造成柴油机启动困难、运转不稳。装上新燃油滤清器后,不要拧得过紧,否则易导致螺纹或密封圈损坏,正     

怎样延长柴油机机油的使用期

（１）按时保养机油滤清器发动机工作时磨损下来的金属屑、尘土和燃烧杂质等与机油混合,机油经过机油滤清器过滤后,进人下一个循环。如果滤清器过脏而被堵后,未经过滤的机油就会从旁通间直接进人主油道,将大大加剧机件的磨损,因此必须按时保养机油滤清器。有些进口发动机上采用一次性机油滤清器,即到期必须更换,不准清洗后再用。（２）防止燃油进入油底壳如果柴油机高压油泵供油压力低、供油过多,或者喷油器雾化不良,都会使喷人气缸内的柴油得不到充分的燃烧,未燃烧完的燃油就会顺缸壁流人油底壳使机油变稀、粘度下降,过早地失去…     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.