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A Study to Investigate the Effect of Valve Mechanisms on Exhaust Residual Gas and Effective Release Energy of a Motorcycle Engine

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  • Nguyen Xuan Khoa

    (School of Mechanical Engineering, University of Ulsan, San 29, Mugeo2-dong, Nam-gu, Ulsan 44610, Korea
    Faculty of Automobile Technology, Hanoi University of Industry, No. 298, Cau Dien Street, Bac Tu Liem District, Hanoi 100000, Vietnam)

  • Ocktaeck Lim

    (School of Mechanical Engineering, University of Ulsan, San 29, Mugeo2-dong, Nam-gu, Ulsan 44610, Korea)

Abstract

The purpose of this study was to investigate the effect of valve mechanisms on the exhaust residual gas (ERG) and effective release energy (ERE) of a motorcycle engine. Here, a simulation model and the estimation a new valve mechanism design is presented. An AVL-Boost simulation model and an experiment system were established. The classical spline approximation method was used to design a new cam profile for various valve lifts. The simulation model was used to estimate the effect of the new valve mechanism designs on engine performance. A new camshaft was produced based on the research data. The results show that the engine obtained a maximum engine brake torque of 21.53 Nm at 7000 rpm, which is an increase of 3.2% compared to the engine using the original valve mechanism. In addition, the residual gas was improved, the maximum engine effective release energy was 0.83 kJ, the maximum engine power was 18.1 kW, representing an improvement of 7.2%, and the air mass flow was improved by 4.97%.

Suggested Citation

  • Nguyen Xuan Khoa & Ocktaeck Lim, 2021. "A Study to Investigate the Effect of Valve Mechanisms on Exhaust Residual Gas and Effective Release Energy of a Motorcycle Engine," Energies, MDPI, vol. 14(17), pages 1-14, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5564-:d:629833
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    References listed on IDEAS

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    1. Khoa, Nguyen Xuan & Quach Nhu, Y. & Lim, Ocktaeck, 2020. "Estimation of parameters affected in internal exhaust residual gases recirculation and the influence of exhaust residual gas on performance and emission of a spark ignition engine," Applied Energy, Elsevier, vol. 278(C).
    2. Nguyen Xuan Khoa & Ocktaeck Lim, 2020. "Comparative Study of the Effective Release Energy, Residual Gas Fraction, and Emission Characteristics with Various Valve Port Diameter-Bore Ratios (VPD/B) of a Four-Stroke Spark Ignition Engine," Energies, MDPI, vol. 13(6), pages 1-18, March.
    3. Nguyen Xuan Khoa & Ocktaeck Lim, 2021. "The Internal Residual Gas and Effective Release Energy of a Spark-Ignition Engine with Various Inlet Port–Bore Ratios and Full Load Condition," Energies, MDPI, vol. 14(13), pages 1-13, June.
    4. Khoa, Nguyen Xuan & Lim, Ocktaeck, 2019. "The effects of combustion duration on residual gas, effective release energy, engine power and engine emissions characteristics of the motorcycle engine," Applied Energy, Elsevier, vol. 248(C), pages 54-63.
    5. Jung, Dongwon & Iida, Norimasa, 2018. "An investigation of multiple spark discharge using multi-coil ignition system for improving thermal efficiency of lean SI engine operation," Applied Energy, Elsevier, vol. 212(C), pages 322-332.
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