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Vibrometer를 이용한 스프링 장력에 따른 Valvetrain 동특성에 대한 시험적 고찰
서준협(Junhyeop Seo),박재형(Jaehyung Park),주진석(Jinseok Choo) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
Today, issue of high fuel efficiency, reduction of exhaust gases and weight highlighted on development trend of Gasoline and Diesel Engine. Therefore it is important to research and development of each part of engine. Valvetrain play an essential part in suction of air and emission of exhaust gas in Internal Combustion Engine and need to maintain stable behavior from idle speed to max speed. Especially, because about 40% of engine friction loss is valvetrain at low speed, friction reduction for reducing fuel efficiency is the most important factor during engine development. For this reason, many experts study improving valvetrain system from camshaft to valve in order that valvetrain operate stable while valve spring load decrease. Especially, Experts have made many attempts to improve contact loss, valve bounce and jumping in high speed. Valve spring has to provide sufficient preload to keep the valve closed on the base circle. Because of high valve back pressures. This function becomes more important at diesel. Also, valve spring has to provide suitable force to balance dynamic load and avoid unstable movement such as valve bouncing, jumping and so on. Thus, the result of this study aim at development of valvetrain maximize friction reduction and minimize unstable valve movement.
1.5리터급 가솔린직분사 터보 엔진의 입자상 물질 저감을 위한 GPF 적용에 관한 실험적 연구
김재진(Jaejin Kim),이호준(Hojun Lee),임기훈(Gihun Lim),주진석(Jinseok Choo) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
At new turbo-GDI engine development, we have to reduce PN emission as well as gas emission to meet stringent legislation, therefore GPF application must be applied for Eu6d. However, this system makes higher back pressure, so engine performance might be reduced and has to consider appropriate EMS control for GPF soot loading/regeneration to prevent from GPF failure and/or PN reduction. Purpose of this study is optimizing between PN emission and performance, verifying calibration acceptance and GPF reliability with abuse test mode to get robust GPF system. Based on this study, this GPF test process is going to be SYMC GPF development standard for GPF function test.