가별 밸브개폐시기 기구 운전의 엔진 성능에의 영향Effects of Variable Valve Timing Operation Modes on Engine Performance

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Adaptive valve timing control is one of the promising techniques to accomplish the optimized mixture formation and combustion depending on the load and speed, which is needed to meet the future challenges in reducing fuel consumption and exhaust emissions. The behavior and the effect of adaptive valve timing control system has been investigated by computer simulation, which simulates the gas dynamics in engines. Improved fuel economy can be achieved by reduction of pumping loss under low and mid load conditions. EIVC(Early Intake Valve Closing) strategy turns out to be superior to LIVC(Late Intake Valve Closing) strategy in reducing fuel consumption. Deterioration of combustion quality can be overcome by introducing LIVO(Late Intake Valve Opening) strategy, which increases turbulent intensity in cylinders. Furthermore, LIVO can reduce HC emission by decreasing the required amount of fuel to be injected during cold start.
Publisher
한국자동차공학회
Issue Date
2001-11
Keywords

펌핑 손실; 가변밸브기구; 펌핑평균유효압력; 흡기밸브 조기폐쇄; 흡기밸브 늦은 폐쇄; 냉간 시동

Citation

한국자동차공학논문집, Vol.9, No.6, pp.24-29

URI
http://hdl.handle.net/10203/18770
Link
http://www.ksae.org/
Appears in Collection
ME-Conference Papers(학술회의논문)
Files in This Item
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