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首页> 外文期刊>Energy Conversion & Management >The Miller cycle effects on improvement of fuel economy in a highly boosted, high compression ratio, direct-injection gasoline engine: EIVC vs. LIVC
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The Miller cycle effects on improvement of fuel economy in a highly boosted, high compression ratio, direct-injection gasoline engine: EIVC vs. LIVC

机译：米勒循环对高增压，高压缩比，直喷汽油发动机的燃油经济性的影响：EIVC与LIVC

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摘要

A combination of downsizing, highly boosting and direct injection (DI) is an effective way to improve fuel economy of gasoline engines without the penalties of reduced torque or power output. At high loads, however, knock problem becomes severer when increasing the intake boosting. As a compromise, geometric compression ratio (CR) is usually reduced to mitigate knock, and the improvement of fuel economy is discounted. Application of Miller cycle, which can be realized by either early or late intake valve closing (EIVC or LIVC), has the potential to reduce the effective CR and suppress knock. In this paper, the effects of EIVC and LIVC on the fuel economy of a boosted DI gasoline production engine reformed with a geometric CR of 12.0 are experimentally compared at low and high loads. Compared to the original production engine with CR 9.3, at the high load operation, the brake specific fuel consumption (BSFC) is improved by 4.7% with CR12.0 and LIVC, while the effect of EIVC on improving BSFC is negligibly small. At the low load operation, combined with CR12.0, LIVC and EIVC improve the fuel economy by 6.8% and 7.4%, respectively, compared to the production engine. The mechanism behind the effects of LIVC and EIVC on improving the fuel economy is discussed. These results will be a valuable reference for engine designers and researchers.
机译：减小尺寸，高度增压和直接喷射（DI）的组合是提高汽油发动机燃油经济性的有效方法，而不会降低扭矩或功率输出。然而，在高负载下，增加进气量增加时爆震问题变得更加严重。作为折衷方案，通常减小几何压缩比（CR）以减轻爆震，并且降低了燃油经济性。米勒循环的应用可以通过提前或延迟进气门关闭（EIVC或LIVC）来实现，它有可能降低有效CR并抑制爆震。在本文中，通过实验比较了在低负荷和高负荷下，EIVC和LIVC对改良的几何CR为12.0的DI汽油发动机的燃油经济性的影响。与CR 9.3的原始生产发动机相比，在高负荷运行时，CR12.0和LIVC的制动比油耗（BSFC）降低了4.7％，而EIVC改善BSFC的效果很小。与生产发动机相比，在低负载运行时，与CR12.0结合使用时，LIVC和EIVC分别使燃油经济性提高了6.8％和7.4％。讨论了LIVC和EIVC影响改善燃油经济性的背后机理。这些结果将为发动机设计人员和研究人员提供有价值的参考。

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  • 来源
    《Energy Conversion & Management》 |2014年第3期|59-65|共7页
  • 作者

    Tie Li; Yi Gao; Jiasheng Wang; Ziqian Chen;

  • 作者单位

    School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Rd., Shanghai 200240, PR China;

    School of Mechanical Engineering, Shanghai Jiao Tong University, PR China;

    School of Mechanical Engineering, Shanghai Jiao Tong University, PR China;

    School of Mechanical Engineering, Shanghai Jiao Tong University, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fuel economy; Gasoline engines; Intake boosting; Miller cycle; Knock; Pumping loss;

    机译：燃油经济性;汽油机;摄入量增加;米勒循环;敲;抽水损失;

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