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Effect of the Intake Valve Lift and Closing Angle on Part Load Efficiency of a Spark Ignition Engine

Author

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  • Michelangelo Balmelli

    (Automotive Powertrain Technologies Laboratory, Empa Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland)

  • Norbert Zsiga

    (Automotive Powertrain Technologies Laboratory, Empa Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland)

  • Laura Merotto

    (Automotive Powertrain Technologies Laboratory, Empa Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland)

  • Patrik Soltic

    (Automotive Powertrain Technologies Laboratory, Empa Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland)

Abstract

This study provides an experimental evaluation of the effectiveness of Miller cycles with various combinations of lift and intake valve closing angle for a passenger car engine with premixed combustion in naturally aspirated operation. A fully variable electro-hydraulic valve train provided different valve lift profiles. Six load points, from 1.5 up to 5 bar brake mean effective pressure at a constant engine speed of 2000 min −1 , were tested with 6 different intake valve lift/intake valve closing angle combinations. The intake valve closing angle was always set before bottom dead center to achieve the desired load with unthrottled operations. Experimental comparison with throttled operation outlines an indicated efficiency increase of up to 10% using high intake lift with early valve closing angle. Furthermore, this analysis outlines the influences that early intake valve closing angle has on fuel energy disposition. Longer combustion duration occurs using early intake valve closing angle because of turbulence dissipation effects, leading to slight reductions in the heat-to-work efficiency. However, overall pressure and temperature levels decrease and consequently heat losses and losses due to incomplete combustion decrease as well. Overall, we found that combustion deterioration is compensated/mitigated by the reduction of the heat losses so that reductions of pumping losses using early intake valve closing can be fully exploited to increase the engine’s efficiency.

Suggested Citation

  • Michelangelo Balmelli & Norbert Zsiga & Laura Merotto & Patrik Soltic, 2020. "Effect of the Intake Valve Lift and Closing Angle on Part Load Efficiency of a Spark Ignition Engine," Energies, MDPI, vol. 13(7), pages 1-16, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:7:p:1682-:d:340811
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    References listed on IDEAS

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    1. Chiang, Chia-Jui & Yang, Jing-Long & Lan, Shao-Ya & Shei, Tsung-Wei & Chiang, Wen-Shu & Chen, Bo-Liang, 2013. "Dynamic modeling of a SI/HCCI free-piston engine generator with electric mechanical valves," Applied Energy, Elsevier, vol. 102(C), pages 336-346.
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    Cited by:

    1. Frederico de Oliveira Assuncao & Luiz Eduardo Borges-da-Silva & Helcio Francisco Villa-Nova & Erik Leandro Bonaldi & Levy Ely Lacerda Oliveira & Germano Lambert-Torres & Carlos Eduardo Teixeira & Wils, 2021. "Reduced Scale Laboratory for Training and Research in Condition-Based Maintenance Strategies for Combustion Engine Power Plants and a Novel Method for Monitoring of Inlet and Exhaust Valves," Energies, MDPI, vol. 14(19), pages 1-23, October.
    2. Andyn Omanovic & Norbert Zsiga & Patrik Soltic & Christopher Onder, 2021. "Increased Internal Combustion Engine Efficiency with Optimized Valve Timings in Extended Stroke Operation," Energies, MDPI, vol. 14(10), pages 1-24, May.
    3. Simone Ferrari & Riccardo Rossi & Annalisa Di Bernardino, 2022. "A Review of Laboratory and Numerical Techniques to Simulate Turbulent Flows," Energies, MDPI, vol. 15(20), pages 1-56, October.
    4. Andyn Omanovic & Norbert Zsiga & Patrik Soltic & Christopher Onder, 2021. "Optimal Degree of Hybridization for Spark-Ignited Engines with Optional Variable Valve Timings," Energies, MDPI, vol. 14(23), pages 1-21, December.
    5. Norbert Zsiga & Johannes Ritzmann & Patrik Soltic, 2021. "Practical Aspects of Cylinder Deactivation and Reactivation," Energies, MDPI, vol. 14(9), pages 1-20, April.

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