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Development of a new mechanical electro hydraulic valvetrain system

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Abstract

Variable valve actuation (VVA) technologies can provide improvements in fuel economy of spark-ignition (SI) engines by shifting valve timings or generating valve profiles that can minimize pum** loss. Electro hydraulic valve (EHV) is one of VVA technologies that is highly flexible in producing valve profiles to control charge mass without throttle. In this work, a new EHV which has a unique operating mode, namely mechanical mode, is introduced. The mechanical mode enables operation of valvetrain under circumstances of EHV malfunctions: the mechanical electro-hydraulic valvetrain (MEHV) developed in this study was capable of stable operation under various operating modes at wide ranges of oil temperatures and cam speeds with appropriate valve seating velocity and ramp duration. The MEHV is a VVA technology that can resolve issues of previous EHVs which lacked reliability under emergency conditions.

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Abbreviations

VVA :

Variable valve actuation

SI:

Spark ignition

EHV :

Electro hydraulic valve

MEHV :

Mechanical electro hydraulic valvetrain

OCV:

Oil control valve

FLD:

Full lift duration

EVC:

Early valve close

LVO:

Late valve open

ZL:

Zero-lift

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Author information

Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 08826, Korea

    Jongwon Chung, Namho Kim, Hyunjung Oh & Kyoungdoug Min

  2. Hyundai Motor Company, 772 1, Jangduk dong, Hwaseong Si, Gyeonggi Do, 445-706, Korea

    Myungsik Choi & Wonkyu Kim

Authors
  1. Jongwon Chung
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  2. Namho Kim
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  3. Hyunjung Oh
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  4. Myungsik Choi
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  5. Wonkyu Kim
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  6. Kyoungdoug Min
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Corresponding author

Correspondence to Kyoungdoug Min.

Additional information

Jongwon Chung received his B.S. from the Department of Mechanical Engineering at Seoul National University in 2013. He is currently a Ph.D. candidate in the Department of Mechanical Engineering at Seoul National University. His research interests include GDI engine combustion and emission.

Kyoungdoug Min received his B.S. and M.S. degrees from the Department of Mechanical Engineering at Seoul National University in 1986 and 1988, respectively. He then obtained his Ph.D. degree from M.I.T in 1994. He is currently a Professor in the School of Mechanical and Aerospace Engineering at Seoul National University.

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Chung, J., Kim, N., Oh, H. et al. Development of a new mechanical electro hydraulic valvetrain system. J Mech Sci Technol 35, 361–370 (2021). https://doi.org/10.1007/s12206-020-1236-7

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  • DOI: https://doi.org/10.1007/s12206-020-1236-7

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