柴油机喷油泵的可变预行程研究

根据柴油机工况变化，优化喷油定时和油速率可提高柴油机的动力性和经济性，减少有害排放物，降低燃烧噪声。     

满足欧Ⅱ排放法规CZ480Q柴油机技术对策

通过对CZ480Q型直喷式柴油机燃烧过程和排放特性的试验研究,系统地分析了燃烧室形状、喷油系统参数、后处理措施对柴油机燃烧过程和有害排放物的影响,探讨小缸径直喷式柴油机满足欧Ⅱ排放法规的技术对策;最终试验结果表明,改进措施改善了柴油机的燃烧过程,降低了柴油机有害排放物,排放指标均低于欧Ⅱ排放限值。     

柴油机喷油泵的可变预行程研究

根据柴油机工况变化，优化喷油定时和喷油速率可提高柴油机的动力性和经济性，减少有害排放物，降低燃烧噪声。采用可变预行程机构实现供油定时和供油速率的变化，是方便可行的有效方法。     

影响柴油机排放的基本因素

本文在有关参考文献的基础上，分析了影响柴油机气态排放物、碳烟和颗粒排放的基本因素，提出了降低柴油机有害排放物的措施，以期给柴油机的设计和使用引出新的思路     

影响柴油机排放的基本因素

本文在有关参考文献的基础上，分析了影响柴油机气态排放物，碳烟和颗粒排放的基本因素，提出了降低柴油机有害排放物的措施，以期给柴油机的设计和使用引出新的思路。     

柴油机有害排放物与柴油性质的关系及控制技术措施

详细介绍了柴油机有害排放物与柴油十六烷值、粘度和张力、密度、含硫量、芳香烃含量等的关系 ,并指出了相应的控制柴油机有害排放物的技术措施     

K16E柴油机排气消声坑的设计和试验

本文论述了高速大功率增压柴油机试验室排气系统中的三节抗阻抗式消声坑的设计和试验结果。消声坑的设计在力求降低排气噪声和污染危害方面采用了多种措施。通过实机500多小时试验后,测得经消声坑后柴油机的排气噪声的衰减相当明显;基本消除了废气中的烟灰、油粒等有害排放物,解决了柴油机排气噪声及污染物对环境的严重危害。     

Bosch公司开发的柴油机用共轨式电控喷油系统(上)

目前的热点问题莫过于环境保护和经济性。特别是对柴油机来讲,今后任何一种有助于解决上述热点问题的技术都是至关重要的。 降低柴油机燃油比耗量、减少废气中有害排放物以及降低噪声的要求不断在提高,     

车用柴油机达欧Ⅲ排放的探讨

简要介绍柴油机达到达欧Ⅲ排放所需要的技术手段,并针对直喷式柴油机重点加以讨论,提出现代柴油机有害排放物的控制是一个综合的、系统的工程,以改进机内净化为核心,辅以后处理技术,可大大降低柴油机的有害排放物.     

车用柴油机达欧Ⅲ排放的探讨

简要介绍柴油机达到达欧Ⅲ排放所需要的技术手段,并针对直喷式柴油机重点加以讨论,提出现代柴油机有害排放物的控制是一个综合的、系统的工程,以改进机内净化为核心,辅以后处理技术,可大大降低柴油机的有害排放物。     

柴油机燃用LPG的高原特性实验研究

在高原环境条件下,针对柴油机燃用LPG的经济性,动力性和排放排性进行了研究,柴油机掺烧LPG后,在一定的掺烧比下,动力性有所提高,经济性有所改善,碳煤排放降低幅放较大,但发动机振动和大,噪声和排温升高,试验结果为在高原地区推广应用PLG／柴油双燃料发动机提供了依据。     

柱塞泵性能的液力调整和喷油过程的分析

环保与人类生存的关系巳日趋紧密,而汽车尾气排放给环境带来严重威胁。由于柴油机应用极广,因此必须把改善它的燃烧和排放列为重要议题。柴油机喷油泵的供油特性及喷油过程对其燃烧和排放的影响很大,而出油阀结构的变化在改善这些性能上有独特效果,所以对出油阀进行改进,利用其缝隙在不同转速下对燃油的节流作用,实现对供油的优化调整,以达到节能和降低排放的目的。     

N485Ca高速船用柴油机的开发与研制

主要介绍了N485Ca船用柴油机的结构设计及性能开发的情况,并经试验验证该发动机的排放、噪声、机械振动等指标均符合国家或行业标准的要求。     

车用柴油机瞬变工况排放测试方法与控制措施初探

介绍了车用柴油机瞬态工况排放问题的由来,初步探讨了我国现阶段瞬态循环排放的研究方法。随着排放法规日益严格,瞬态排放要求已提到议事日程,限于我国现阶段瞬态循环排放测试实施有困难,通过稳态排放试验和瞬态工作过程模拟相结合的方法来研究瞬态排放性能,在一定程度上可弥补直接进行瞬态测试的困难。文中还讨论了控制和降低车用柴油机瞬态工况排放的一些措施及其效果。     

四极质谱用于内燃机排气成分检测的研究

分析了四极质谱的基本原理 ,介绍了采用四极质谱动态测量内燃机排气成分的方法及实现动态检测的系统方案和动态测试结果。采用上述方法对 6 10 8柴油机进行了排气成分取样分析 ,给出了发动机排放测试结果。     

Soot processes in compression ignition engines

While diesel engines are arguably superior to any other power-production device for the transportation sector in terms of efficiency, torque, and overall driveability, they suffer from inferior performance in terms of noise, NO_x and particulate emissions. The majority of particulate originates with soot particles which are formed in fuel-rich regions of burning diesel jets. Over the past two decades, our understanding of the formation process of soot in diesel combustion has transformed from inferences based on exhaust measurements and laboratory flames to direct in-cylinder observations that have led to a transformation in diesel engine combustion. In-cylinder measurements show the diesel spray to produce a jet which forms a lifted, partially premixed, turbulent diffusion flame. Soot formation has been found to be strongly dependent on air entrainment in the lifted portion of the jet as well as by oxygen in the fuel and to a lesser extent the composition and structure of hydrocarbons in the fuel. Soot surviving the combustion process and exiting in the exhaust is dominated by soot from fuel-rich pockets which do not have time to mix and burn prior to exhaust valve opening. Higher temperatures at the end of combustion enhance the burnout of soot, while high temperatures at the time of injection reduce air entrainment and increase soot formation. Using a conceptual model based on in-cylinder soot and combustion measurements, trends seen in exhaust particulate can be explained. The current trend in diesel engine emissions control involves multi-injection combustion strategies which are transforming the picture of diesel combustion rapidly into a series of low temperature, stratified charge, premixed combustion events where NO_x formation is avoided because of low temperature and soot formation is avoided by leaning the mixture or increasing air entrainment prior to ignition.     

小型直喷式柴油机缩口型燃烧室的设计与研究

在4100型直喷式柴油机上，为改进的进气系统和供油系统匹配设计了几种不同形状的缩口型燃烧室，研究了燃烧室形状对柴油机性能的影响。试验结果表明，体积较大的球形底台的缩口燃烧室能促使油-气混合，改善燃烧过程，有利于实现柴油机的动力性、经济性和排放指标的良好折中。     

柴油机排气微粒测量中若干因素对测量结果的影响

作者研究了柴油机排气温度、空气温度、稀释比和测量时排气抽取位置对排气微粒质量浓度的影响。本文介绍研究工作的结果。同时还介绍了作者自己研制的一套柴油机排气微粒小型测量装置。该装置体积小、重量轻、移动方便、操作简单、成本低,能满足研究工作的需要。     

Effect of exhaust gas recirculation on diesel engine nitrogen oxide reduction operating with jojoba methyl ester

Jojoba methyl ester (JME) has been used as a renewable fuel in numerous studies evaluating its potential use in diesel engines. These studies showed that this fuel is good gas oil substitute but an increase in the nitrogenous oxides emissions was observed at all operating conditions. The aim of this study mainly was to quantify the efficiency of exhaust gas recirculation (EGR) when using JME fuel in a fully instrumented, two-cylinder, naturally aspirated, four-stroke direct injection diesel engine. The tests were carried out in three sections. Firstly, the measured performance and exhaust emissions of the diesel engine operating with diesel fuel and JME at various speeds under full load are determined and compared. Secondly, tests were performed at constant speed with two loads to investigate the EGR effect on engine performance and exhaust emissions including nitrogenous oxides (NO_x), carbon monoxide (CO), unburned hydrocarbons (HC) and exhaust gas temperatures. Thirdly, the effect of cooled EGR with high ratio at full load on engine performance and emissions was examined. The results showed that EGR is an effective technique for reducing NO_x emissions with JME fuel especially in light-duty diesel engines. With the application of the EGR method, the CO and HC concentration in the engine-out emissions increased. For all operating conditions, a better trade-off between HC, CO and NO_x emissions can be attained within a limited EGR rate of 5–15% with very little economy penalty.     

植物油用作柴油机代用燃料的研究

本文对废气涡轮增压中冷、预燃室式柴油机燃机用植物油与燃用柴油机的特性做了大量对比试验研究，讨论了柴油机燃用植物油存在的一些技术问题，并提出了相应的解决措施。结果表明，柴油机燃用植物油时，其功率特性、油耗特性及排放特性等均能满足使用要求。