| 제목 |
가변밸브 작동기구를 적용한 가솔린 기관의 잔류가스분율, 체적효율, 펌핑손실 예측을 위한 해석적 연구 |
| 분야 |
엔진 및 연소 |
| 언어 |
Korean |
| 저자 |
조용석(국민대학교), 이성욱(국민대학교), 김현철(자동차부품연구원), 박정권(국민대학교), 박영준(국민대학교), 장익규(국민대학교), 윤여빈(국민대학교), 나병철(자동차부품연구원) |
| Key Words |
CFD(전산유체해석), Valve lift(밸브 양정), Valve timing(밸브 개폐시기), Residual gas(잔류가스), Volumetric efficiency(체적효율), Pumping loss(펌핑손실) |
| 초록 |
To satisfy the needs on fuel economy and engine performance, continuous variable valve lift systems are applying to engines. In the CVVL system, fuel economy can be improved by reducing pumping loss during the induction process, and engine performance can be also improved by controlling volumetric efficiency and the residual gas fraction. Because the residual gas fraction directly affects volumetric efficiency, engine performance, combustion efficiency and emissions in SI engines, controlling residual gas fraction is one of the important things in engine development process. This analysis investigates the residual gas fraction and volumetric efficiency with changes of intake valve lifts and intake valve timings. In this study, unsteady state solutions were solved during exhaust and induction processes. Results show variation of the residual gas fraction and volumetric efficiency by changing intake valve timing and lift. Decreasing intake valve lift leads to increase the residual gas fraction and to decrease volumetric efficiency. |
| 원문(PDF) |
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