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Development of a new mechanical electro hydraulic valvetrain system

Cited 1 time in Web of Science Cited 1 time in Scopus
Authors

Chung, Jongwon; Kim, Namho; Oh, Hyunjung; Choi, Myungsik; Kim, Wonkyu; Min, Kyoungdoug

Issue Date
2021-01
Publisher
대한기계학회
Citation
Journal of Mechanical Science and Technology, Vol.35 No.1, pp.361-370
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 pumping 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.
ISSN
1738-494X
URI
https://hdl.handle.net/10371/197845
DOI
https://doi.org/10.1007/s12206-020-1236-7
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