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Effect of Divided Exhaust Period in a High Efficiency TGDI Engine

Author

Listed:
  • Heechang Oh

    (R&D Division, Hyundai Motor Company, Hwaseoung-si 18290, Gyeonggi-do, Korea)

  • Dongwon Jung

    (R&D Division, Hyundai Motor Company, Hwaseoung-si 18290, Gyeonggi-do, Korea)

  • Jinwook Son

    (R&D Division, Hyundai Motor Company, Hwaseoung-si 18290, Gyeonggi-do, Korea)

  • Soohyung Woo

    (R&D Division, Hyundai Motor Company, Hwaseoung-si 18290, Gyeonggi-do, Korea)

  • David Roth

    (Roth Engine Science LLC, Groton, NY 13073, USA)

  • Jerry Song

    (Navistar Inc., Lisle, IL 60532, USA)

  • Youngmyung Kweon

    (BorgWarner Chungju, Chungju-si 27465, Chungcheongbuk-do, Korea)

  • Joonsik Hwang

    (Department of Mechanical Engineering, Mississippi State University, Starkville, MS 39762, USA)

Abstract

The divided exhaust period (DEP) concept was applied to a high-efficiency gasoline engine and its impact on various engine performance aspects were investigated. To this end, key design parameters of DEP components were optimized through 1-D engine simulation. The designed DEP components were fabricated and experimental verification was performed through an engine dynamometer test. The developed DEP engine shows suitable performance for electrified vehicles, with a maximum thermal efficiency of 42.5% as well as a wide sweet spot area of efficiency over 40%. The improvement in thermal efficiency was mainly due to a reduction in pumping loss. Notably, the reduction in pumping loss was achieved under high exhaust gas recirculation (EGR) flow conditions, where further improvements in fuel consumption could be achieved through a synergistic combination of DEP implementation and high dilution combustion. Furthermore, a significantly improved catalyst light-off time, uncharacteristic in turbocharged engines, was confirmed through a simulated cold-start catalyst heating engine test.

Suggested Citation

  • Heechang Oh & Dongwon Jung & Jinwook Son & Soohyung Woo & David Roth & Jerry Song & Youngmyung Kweon & Joonsik Hwang, 2021. "Effect of Divided Exhaust Period in a High Efficiency TGDI Engine," Energies, MDPI, vol. 14(19), pages 1-22, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:19:p:6343-:d:649874
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