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- Title
Effect of Divided Exhaust Period in a High Efficiency TGDI Engine.
- Authors
Oh, Heechang; Jung, Dongwon; Son, Jinwook; Woo, Soohyung; Roth, David; Song, Jerry; Kweon, Youngmyung; Hwang, Joonsik
- 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.
- Subjects
HEAT engines; THERMAL efficiency; ENGINE testing; ENGINES; DYNAMOMETER; ENERGY consumption; SPARK ignition engines
- Publication
Energies (19961073), 2021, Vol 14, Issue 19, p6343
- ISSN
1996-1073
- Publication type
Article
- DOI
10.3390/en14196343