机油增效剂的作用机理及试验研究

随着内燃机的强化,良好的润滑成为一关键问题。本文通过在润滑油中加入添加剂的对比试验,分析出提高油品质量和改善内燃机各项性能的途径及方法。     

X195柴油机可靠性试验数据库的研究

选择云南省生产的量大面广的Ｘ１９５柴油机,应用现代的可靠性技术方法,建立其产品质量信息的可靠性试验数据库管理系统,以求实现和推广在机械行业中用可靠性理论指导提高产品质量的研究。     

某2.8L柴油机台架噪声试验研究

通过采用声压测量法对柴油机进行整机台架噪声试验,试验结果表明:随着发动机转速和负荷的提高,发动机的噪声增大,转速对噪声的影响比负荷对噪声的影响更加明显;并且对发动机燃烧噪声、机械噪声的产生机理及其对整机噪声的贡献度进行了分析。     

柴油机排气管窜油故障的分析及其改进措施

文章通过对船舶柴油机存在的排气管窜机油现象的分析,列出了柴油机排气管窜机油的各种原因,就其实际工作情况说明导致排气管窜机油的主要原因,提出了改进和预防措施,并取得了预期的效果。这对现有主机的改进,具有一定的借鉴意义。     

机油耗及燃油品质对增压柴油机排放的影响

在一台6108ZLQB柴油机上研究了机油耗及燃油品质对NOx和PM排放的影响.结果表明:改进缸套珩磨工艺后,机油耗和PM明显降低;降低燃油舍琉量能让PM和烟度下降,但降低十六烷值会使NOx有所上升.     

195型柴油机减少润滑油消耗量的试验研究

能源是国民经济发展的动力,与人民生活密切相关,是实现四个现代化的根本环节之一。当前,世界上常规能源之一——石油已十分紧张。很多专家认为除常规能源(煤、油、气等)、新能源(核能、太阳能、地热能、潮汐能等)外,应把节能工作所节省的能源称之为“第三能源”。因此,节能即开发“第三能源”。     

柴油机机油耗偏高的原因、危害及对策

机油消耗量是柴油机的重要性能指标之一,机油耗偏高会影响整机的排放指标和可靠性.文中论述了我国车用柴油机机油消耗量偏高的主要原因、危害及对策.     

YC6L柴油机车用动力匹配试验工况研究

介绍了YC6L350-20柴油机匹配整车道路试验方案与动力性、经济性的试验结果及加权综合评价法。得出为获得较好的整车综合使用性能，柴油机配车应进行详细的整车匹配和评价，同时对变速箱和后桥速比进行优化试验，对试验结果可以通过加权综合评价法对汽车综合性能进行评价。     

12VE230ZC—AⅡ型柴油机操纵机构改进设计研究

介绍了为提高１２ＶＥ２３０ＺＣ－ＡⅡ型柴油机操纵系统的可靠性所进行的改进设计情况,对类似机型操纵系统的设计有借鉴作用。     

柴油机机油面升高的原因

一台TY16C型推土机配用康明斯NTB55-C280型柴油机。作业过程中出现行驶无力,机油压力超出规定值、冒蓝烟．气门摇臂室和通气孔处有油液窜出。油底壳油面升高．变速器（液力系统油箱）的油液明显减少。     

The Role of Soot Aggregation on the Lubrication of Diesel Engines

This paper deals with the role of the soot on the valvetrain wear in diesel engines. First, wear is related to the soot aggregation at the inlet, of the cam-tappet contact. Then, an experimental device using a Rayleigh pad which allows one to study the aggregation underflow of diesel soot in completely formulated oils is described. The results concerning four oil samples, chosen for their differences in formulation and aging are given and related to the wear. Finally, the aggregation is related to the interparticle interactions and, more particularly, to the dielectric constants of the soots and of the lubricant.     

基于径向基函数神经网络的柴油机故障诊断

提出一种应用径向基函数(RBF)神经网络解决故障诊断问题的方法,并将其应用于柴油机故障诊断与识别。在RBF神经网络中采用了一种减聚类的学习算法来确定径向基函数的相应参数,从而使神经网络结构得到优化。实例仿真结果表明,RBF神经网络学习收敛较快,对故障识别性能好。     

An Experimental Investigation of the Influence of the Lubricant Viscosity and Additives on Gear Wear

The influence of lubricant viscosity and additives on the average wear rate of spur gear pairs was investigated experimentally. The gear specimens of a comprehensive gear durability test program that made use of seven lubricants covering a range of viscosities were examined to measure gear tooth wear. The measured wear was related to the as-manufactured surface roughness, the elastohydrodynamic film thickness, and the experimentally determined contact fatigue lives of the same specimens. In general, the wear rate was found to be inversely proportional to the viscosity of the lubricant and to the lambda ratio (also sometimes called the specific film thickness). The data also show an exponential trend between the average wear rates and the surface fatigue lives. Lubricants with similar viscosities but differing additives and compositions had somewhat differing gear surface fatigue lives and wear rates.     

柴油机燃烧过程的影响因素分析

本文分析了柴油机温度和压缩比、燃烧室形状、柴油机负荷、柴油机转速、燃料性质、喷油定时、供油规律和喷雾质量等因素对柴油机燃烧过程的影响规律,为正常使用和维护柴油机以及进一步提高燃油经济性提供理论依据和指导。     

现代中、小型柴油机密封设计技术

介绍了现代中,小型柴油机设计中,采用的密封设计方法和密封材料的选择。     

Bio-Fuel-Contaminated Lubricant and Hardening Effects on the Friction and Wear of AISI 1045 Steel

A study has been made on the wear and friction of hardened AISI 1045 steel using a tri-pin-on-disc type of friction and wear apparatus. During the investigation the linear pin wear, coefficient of friction and rise in pin specimen temperature were monitored and wear and friction curves plotted. Wear surfaces and mechanisms were investigated by means of optical microscopy. Analysis of used lubricating oil was performed using FTIR spectroscopy.

It was shown that the wear rate, type of wear and friction coefficient were influenced by contaminating the lubricant with bio-fuel as well as the surface hardening treatment. Corrosive wear and pits on the specimen surface were found when plain bio-fuel was used as lubricating oil. The results also confirmed that better wear resistance was obtained from the surface-hardened steel specimen with 4 % bio-fuel-contaminated lubricant.

Results from this study will be useful in material selection for tribological components in diesel engines running on vegetable fuel.     

Ionic Liquids as Novel Lubricants and Additives for Diesel Engine Applications

The lubricating properties of two ionic liquids (ILs) with the same anion but different cations, one ammonium IL [C₈H₁₇]₃NH.Tf₂N and one imidazolium IL C₁₀mim.Tf₂N, were evaluated both in neat form and as oil additives. Experiments were conducted using a standardized reciprocating sliding test with a segment of a Cr-plated diesel engine piston ring against a gray cast iron flat specimen. The cast iron surface was prepared with simulated honing marks as on a typical internal combustion engine cylinder liner. The selected ILs were benchmarked against conventional hydrocarbon oils. Substantial friction and wear reductions, up to 55% and 34%, respectively, were achieved for the neat ILs compared to a fully formulated 15W40 engine oil. Adding 5 vol% ILs into mineral oil has demonstrated significant improvement in the lubricity. One blend even outperformed the 15W40 engine oil with 9% lower friction and 34% less wear. Lubrication regime modeling, worn surface morphology examination, and surface chemical analysis were conducted to help understand the lubricating mechanisms for ILs. Results suggest great potential for using ionic liquids as base lubricants or lubricant additives for diesel engine applications.     

船舶柴油机缸套活塞环微观滑动接触模型研究

本文根据模拟试验的相似准则设计了磨损试验,得出硬化相的性能和含量与试验所选用的材料在性和一致,且随着载荷的增加,材料发生拉毛的时间呈指数关系下降。在此基础上建立了摩擦配对副三滑磨面接触模型,为更好地解释内燃机气缸套及活塞环的磨损现象提供了理论依据。     

宽范围氧传感器控制器设计及在柴油机EGR系统中的应用

设计了宽范围氧传感器控制器，并对其输出电压与混合气过量空气系数λ的关系进行了测试。其具有灵敏度高、重复性好、测量范围宽、响应时间短等优点，将作为关键部件之一在内燃机控制系统中得到广泛应用。以宽范围氧传感器为关键部件，研制了以进排气中氧含量为控制目标的新型柴油机EGR系统，控制思路正确、逻辑简单，台架试验表明，N0x含量降低45％，取得了较好的效果。