Diesel Engine Emissions During High EGR Operation

高 EGR 运行期间的柴油机排放

• 批准号: EP/F031351/1
• 负责人: Colin Garner
• 金额: $ 34.42万
• 依托单位: Loughborough University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FF031351%2F1
• 关键词: Diesel; Engine; Emissions; During; EGR

Due to their high fuel economy, diesel engines are widely used in on-road applications. The need to maintain efficiency and performance while meeting increasingly stringent emissions regulations is forcing engine developers to design advanced in-cylinder combustion strategies tailored to minimize emissions and maximize performance at specific operating conditions. These strategies are currently limited by high emissions and poor performance as the engine's speed and load change during transient operation. Even under a wide range of steady-state combustion conditions, there is a shortage of fundamental understanding of the effects of the engine load, charge conditions and charge composition on the combustion process.Transient tests provide information on the effects of a change in the operating mode of an engine. The results of such tests are highly specific to the engine, air exchange, and control system used; it can also be difficult to identify cause and effect relationships relating to the combustion event. As a result, while such tests are necessary for engine development, they do not provide the information needed to develop the improved fundamental understanding being sought in this project. Therefore, this project will adopt well controlled steady-state engine tests with the operating conditions selected to be representative of the charge conditions encountered by individual engine cycles during transient operation. Cycle-to-cycle variability in the composition of the air in the intake and exhaust streams will be measured and will be compared to the observed variability in the combustion event. A variety of tests, including the use of an ignition promoter, will permit evaluation of the principal causes of combustion instability.Combustion instability leads to poor engine performance and high unburned fuel emissions. It is one of the key barriers to the application of high EGR strategies to control diesel engine emissions. Many new diesel engine injection systems have the potential to inject fuel several times within one combustion cycle. This project will use the newly developed fundamental understanding of high-EGR operation to identify novel injection strategies that can improve combustion performance. An optimization process will be used to identify the most promising potential strategies over a range of engine operating conditions similar to those encountered during transient operation. This project will involve two PhD research students (one of whom will be funded by Loughborough University) working under the close supervision of the PI. An advisory panel composed of experienced academic and industrial engine researchers will provide guidance for the project. Technical support will be provided by skilled research technicians. The research will be conducted on a newly installed, state-of-the-art automotive-sized single-cylinder research engine. The overall project methodology will involve first identifying the operating conditions which will be encountered during a transitional mode-shift between low temperature (high EGR) and conventional (low EGR) diesel combustion. Then, steady-state engine tests will be conducted over a range of conditions which are representative of the charge composition and EGR levels encountered during transient operation. Based on these experimental results, those operating conditions which demonstrate high emissions and/or poor combustion stability will be investigated in more detail, including optical in-cylinder evaluation and cycle-resolved emissions measurements. A combustion enhancer will be used to investigate the effects of kinetic limitations at high EGR levels. Finally, a range of multiple-injection strategies will be evaluated to identify techniques for controlling emissions under high-EGR transient operation.

由于燃油经济性高，柴油发动机广泛用于道路应用。在满足日益严格的排放法规的同时保持效率和性能的需求迫使发动机开发人员设计先进的缸内燃烧策略，以最大限度地减少排放并最大限度地提高特定工况下的性能。目前，这些策略受到高排放和发动机转速和负载在瞬态运行期间变化时性能差的限制。即使在各种稳态燃烧条件下，也缺乏对发动机负载、充气条件和充气成分对燃烧过程的影响的基本了解。瞬态测试提供了有关运行状态变化影响的信息。发动机的模式。此类测试的结果与所使用的发动机、空气交换和控制系统高度相关；识别与燃烧事件相关的因果关系也可能很困难。因此，虽然此类测试对于发动机开发是必要的，但它们并没有提供开发本项目所寻求的改进的基本理解所需的信息。因此，该项目将采用良好控制的稳态发动机测试，选择代表各个发动机循环在瞬态运行期间遇到的充电条件的运行条件。将测量进气流和排气流中空气成分的循环变化，并将其与燃烧事件中观察到的变化进行比较。各种测试，包括使用点火促进剂，将可以评估燃烧不稳定的主要原因。燃烧不稳定会导致发动机性能差和未燃烧燃料排放量高。这是应用高EGR策略控制柴油机排放的关键障碍之一。许多新型柴油发动机喷射系统有可能在一个燃烧循环内多次喷射燃料。该项目将利用新开发的对高 EGR 运行的基本理解来确定可以改善燃烧性能的新颖喷射策略。优化过程将用于在类似于瞬态运行期间遇到的一系列发动机运行条件下确定最有希望的潜在策略。该项目将涉及两名博士研究生（其中一名将由拉夫堡大学资助）在 PI 的密切监督下工作。由经验丰富的学术和工业发动机研究人员组成的顾问小组将为该项目提供指导。技术支持将由熟练的研究技术人员提供。该研究将在新安装的最先进的汽车级单缸研究发动机上进行。整个项目方法将首先确定低温（高 EGR）和传统（低 EGR）柴油燃烧之间的过渡模式转换期间将遇到的操作条件。然后，将在一系列条件下进行稳态发动机测试，这些条件代表瞬态运行期间遇到的充气成分和 EGR 水平。基于这些实验结果，将对那些表现出高排放和/或燃烧稳定性差的运行条件进行更详细的研究，包括光学缸内评估和循环解析排放测量。燃烧增强剂将用于研究高 EGR 水平下动力学限制的影响。最后，将评估一系列多次喷射策略，以确定在高 EGR 瞬态运行下控制排放的技术。

项目成果

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

低温柴油燃烧对发动机运行参数敏感性的实验研究

• DOI: http://dx.10.1115/1.4006377
• 发表时间: 2012
• 期刊: Journal of Engineering for Gas Turbines and Power
• 作者: McTaggart

The effects of split injections on high exhaust gas recirculation low-temperature diesel engine combustion

分次喷射对高废气再循环低温柴油机燃烧的影响

• DOI: 10.1177/1468087412450987
• 发表时间: 2013-02-01
• 期刊: International Journal of Engine Research
• 影响因子: 2.5
• 作者: A. Sarangi;C. P. Garner;G. McTaggart;M. Davy;E. Wahab;M. Peckham
• 通讯作者: M. Peckham

Insights into the hydrocarbon and carbon monoxide emissions in moderately and highly dilute Low Temperature Combustion

深入了解中度和高度稀释低温燃烧中的碳氢化合物和一氧化碳排放

• DOI: http://dx.10.1177/0954407014521176
• 发表时间: 2014
• 期刊: Journal of Automobile Engineering
• 作者: Sogbesan O

Effects of engine operating parameters on diesel low-temperature combustion with split fuel injection

发动机工作参数对分流喷射柴油低温燃烧的影响

• DOI: 10.1177/0954407012440937
• 发表时间: 2012-04-27
• 期刊: Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
• 作者: A. Sarangi;C. P. Garner;G. McTaggart;M. Davy;E. Wahab;M. Peckham
• 通讯作者: M. Peckham

The Potential of Fuel Metering Control for Optimising Unburned Hydrocarbon Emissions in Diesel Low Temperature Combustion

燃料计量控制在优化柴油低温燃烧中未燃烧碳氢化合物排放方面的潜力

• DOI: http://dx.10.4271/2013-01-0894
• 发表时间: 2013
• 作者: Sogbesan O