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Study on a Novel Variable Valve Timing and Lift Mechanism for a Miller Cycle Diesel Engine

Author

Listed:
  • Fanshuo Liu

    (School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China)

  • Bolan Liu

    (School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China)

  • Junwei Zhang

    (School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China)

  • Peng Wan

    (School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China)

  • Ben Li

    (School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China)

Abstract

Thermal efficiency and power density improvement are the main research foci of the literature on diesel engines. The Miller cycle is considered to be one of the most promising methods of diesel engine operation. In this study, a fully variable valve timing and lift mechanism (CD-HFVVS) was studied to determine the possibility of a Miller operation. Firstly, the valve seat impact buffer in the mechanism was tested, which proved that the buffer can effectively eliminate the valve seat impact. Then the influences of different speeds and oil temperatures were studied. The results show that the valve opening duration is prolonged when engine speed increases, and the valve lift and duration are reduced while the oil temperature increased. The valve timing and lift can be fully adjusted by changing the oil discharge position and the initial plunger position, which further proves that CD-HFVVS can achieve the performance optimization of the Miller cycle. By using the mechanism, a single cylinder test was performed. By using variable inlet valve timing, the fuel efficiency can be effectively improved and the peak pressure and in-cylinder average temperature can both be suppressed.

Suggested Citation

  • Fanshuo Liu & Bolan Liu & Junwei Zhang & Peng Wan & Ben Li, 2022. "Study on a Novel Variable Valve Timing and Lift Mechanism for a Miller Cycle Diesel Engine," Energies, MDPI, vol. 15(22), pages 1-11, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:22:p:8521-:d:972687
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    References listed on IDEAS

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    1. Rinaldini, Carlo Alberto & Mattarelli, Enrico & Golovitchev, Valeri I., 2013. "Potential of the Miller cycle on a HSDI diesel automotive engine," Applied Energy, Elsevier, vol. 112(C), pages 102-119.
    2. Gonca, Guven, 2016. "Comparative performance analyses of irreversible OMCE (Otto Miller cycle engine)-DiMCE (Diesel miller cycle engine)-DMCE (Dual Miller cycle engine)," Energy, Elsevier, vol. 109(C), pages 152-159.
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    Cited by:

    1. Hasan Ustun Basaran, 2023. "Enhanced Exhaust after-Treatment Warmup in a Heavy-Duty Diesel Engine System via Miller Cycle and Delayed Exhaust Valve Opening," Energies, MDPI, vol. 16(12), pages 1-25, June.

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