Effect of Divided Exhaust Period in a High Efficiency TGDI Engine

Heechang Oh, Dongwon Jung, Jinwook Son, Soohyung Woo, David Roth, Jerry Song, Youngmyung Kweon and Joonsik Hwang
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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

Energies, 2021, vol. 14, issue 19, 1-22

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.

Keywords: divided exhaust period (DEP); turbocharged gasoline direct injection (TGDI); exhaust gas recirculation (EGR); gasoline engine; dedicated hybrid engine (DHE); high efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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