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An investigation of variable valve timing effects on HCCI engine performance

机译：可变气门正时对HCCI发动机性能的影响研究

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摘要

The Homogeneous Charge Compression Ignition (HCCI) engine is a promising combustion concept for reducing NOx and particulate matter (PM) emissions and providing a high thermal efficiency in internal combustion engines. This concept though has limitations in the areas of combustion control and achieving stable combustion at high loads. For HCCI to be a viable option for on-road vehicles, further understanding of its combustion phenomenon and its control are essential. Thus, this thesis has a focus on both the experimental setup of an HCCI engine at Michigan Technological University (MTU) and also developing a physical numerical simulation model called the Sequential Model for Residual Affected HCCI (SMRH) to investigate performance of HCCI engines. The primary focus is on understanding the effects of intake and exhaust valve timings on HCCI combustion.;For the experimental studies, this thesis provided the contributions for development of HCCI setup at MTU. In particular, this thesis made contributions in the areas of measurement of valve profiles, measurement of piston to valve contact clearance for procuring new pistons for further studies of high geometric compression ratio HCCI engines. It also consists of developing and testing a supercharging station and the setup of an electrical air heater to extend the HCCI operating region. The HCCI engine setup is based on a GM 2.0 L LHU Gen 1 engine which is a direct injected engine with variable valve timing (VVT) capabilities.;For the simulation studies, a computationally efficient modeling platform has been developed and validated against experimental data from a single cylinder HCCI engine. In-cylinder pressure trace, combustion phasing (CA10, CA50, BD) and performance metrics IMEP, thermal efficiency, and CO emission are found to be in good agreement with experimental data for different operating conditions. Effects of phasing intake and exhaust valves are analyzed using SMRH. In addition, a novel index called Fuel Efficiency and Emissions (FEE) index is defined and is used to determine the optimal valve timings for engine operation through the use of FEE contour maps.
机译：均质充气压缩点火（HCCI）发动机是一种很有前途的燃烧概念，可减少NOx和颗粒物（PM）的排放并在内燃机中提供高的热效率。但是，该概念在燃烧控制和在高负荷下实现稳定燃烧方面存在局限性。为了使HCCI成为公路车辆的可行选择，进一步了解其燃烧现象和控制至关重要。因此，本论文着重于密歇根理工大学（MTU）HCCI发动机的实验装置，还开发了一种物理数值模拟模型，称为残余影响HCCI顺序模型（SMRH），以研究HCCI发动机的性能。主要重点是了解进气门正时和排气门正时对HCCI燃烧的影响。；为进行实验研究，本论文为MTU HCCI装置的开发做出了贡献。特别是，本论文在气门轮廓的测量，活塞与气门接触间隙的测量以获取新活塞以进一步研究高几何压缩比HCCI发动机方面做出了贡献。它还包括开发和测试增压站，以及设置电动空气加热器以扩展HCCI操作区域。 HCCI发动机的设置基于GM 2.0 L LHU Gen 1发动机，该发动机是具有可变气门正时（VVT）功能的直喷式发动机。为了进行仿真研究，已经开发了计算效率高的建模平台，并针对来自以下机构的实验数据进行了验证单缸HCCI发动机。发现缸内压力曲线，燃烧定相（CA10，CA50，BD）和性能指标IMEP，热效率和CO排放与不同操作条件下的实验数据高度吻合。使用SMRH分析了进气门和排气门的定相效果。另外，定义了一种称为燃料效率和排放（FEE）指数的新颖指数，该指数用于通过使用FEE等高线图来确定发动机运行的最佳气门正时。

著录项

  • 作者

    Saigaonkar, Hrishikesh Abhay.;

  • 作者单位

    Michigan Technological University.;

  • 授予单位 Michigan Technological University.;
  • 学科 Mechanical engineering.
  • 学位 M.S.
  • 年度 2014
  • 页码 140 p.
  • 总页数 140
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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