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Study of the Miller Cycle on a Turbocharged DI Gasoline Engine Regarding Fuel Economy Improvement at Part Load

Author

Listed:
  • Xuewei Pan

    (College of Automotive Studies, Tongji University, Shanghai 200092, China
    SAIC Maxus Automotive Co., Ltd., Shanghai 200438, China)

  • Yinghua Zhao

    (College of Automotive Studies, Tongji University, Shanghai 200092, China)

  • Diming Lou

    (College of Automotive Studies, Tongji University, Shanghai 200092, China)

  • Liang Fang

    (College of Automotive Studies, Tongji University, Shanghai 200092, China)

Abstract

This contribution is focused on the fuel economy improvement of the Miller cycle under part-load characteristics on a supercharged DI (Direct Injection) gasoline engine. Firstly, based on the engine bench test, the effects with the Miller cycle application under 3000 rpm were studied. The results show that the Miller cycle has different extents of improvement on pumping loss, combustion and friction loss. For low, medium and high loads, the brake thermal efficiency of the baseline engine is increased by 2.8%, 2.5% and 2.6%, respectively. Besides, the baseline variable valve timing (VVT) is optimized by the test. Subsequently, the 1D CFD (Computational Fluid Dynamics) model of the Miller cycle engine after the test optimization at the working condition of 3000 rpm and BMEP (Brake Mean Effective Pressure) = 10 bar was established, and the influence of the combined change of intake and exhaust valve timing on Miller cycle was studied by simulation. The results show that as the effect of the Miller cycle deepens, the engine’s knocking tendency decreases, so the ignition timing can be further advanced, and the economy of the engine can be improved. Compared with the brake thermal efficiency of the baseline engine, the final result after simulation optimization is increased from 34.6% to 35.6%, which is an improvement of 2.9%.

Suggested Citation

  • Xuewei Pan & Yinghua Zhao & Diming Lou & Liang Fang, 2020. "Study of the Miller Cycle on a Turbocharged DI Gasoline Engine Regarding Fuel Economy Improvement at Part Load," Energies, MDPI, vol. 13(6), pages 1-26, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1500-:d:335570
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    References listed on IDEAS

    as
    1. Zhao, Jinxing, 2017. "Research and application of over-expansion cycle (Atkinson and Miller) engines – A review," Applied Energy, Elsevier, vol. 185(P1), pages 300-319.
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    Cited by:

    1. José R. Serrano & Francisco J. Arnau & Jaime Martín & Ángel Auñón, 2020. "Development of a Variable Valve Actuation Control to Improve Diesel Oxidation Catalyst Efficiency and Emissions in a Light Duty Diesel Engine," Energies, MDPI, vol. 13(17), pages 1-26, September.
    2. Michał Głogowski & Przemysław Kubiak & Szymon Szufa & Piotr Piersa & Łukasz Adrian & Mateusz Krukowski, 2021. "The Use of the Fourier Series to Analyze the Shaping of Thermodynamic Processes in Heat Engines," Energies, MDPI, vol. 14(8), pages 1-23, April.
    3. Luke Oxenham & Yaodong Wang, 2021. "A Study of the Impact of Methanol, Ethanol and the Miller Cycle on a Gasoline Engine," Energies, MDPI, vol. 14(16), pages 1-24, August.
    4. Motong Yang & Yaodong Wang, 2023. "Application of Miller Cycle and Net-Zero Fuel(s) to Diesel Engine: Effect on the Performance and NOx Emissions of a Single-Cylinder Engine," Energies, MDPI, vol. 16(5), pages 1-21, March.

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