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차세대 알루미늄 피스톤의 신뢰성 검증을 위한 내구특성 평가
조일환(Ilhwan Jo),이형상(Hyungsang Lee),김희붕(Heuiboong Kim),장현모(Hyunmo Jang),김동연(Dongyeon Kim),김숭기(Soongkee Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Each automobile company has their own process to validate durability characteristic of their own product. As customer has been focusing initial quality of vehicle, automobile companies try to improve their validation process and work up to enhance initial quality and durability. In case of engine development, engine must be validated its durability characteristic at max load and max power condition, speed transient condition, hot & cold condition and each engine's specific running condition. In this study, after increasing combustion pressure up to 180 bar, initial durability validation cycle which is consisted of high load & high power condition, city cycle condition and vehicle simulation cycle condition was applied for verifying next generation aluminum piston durability characteristic.
산업용 소형디젤엔진의 터보차저 압축기의 파울링 현상 분석을 위한 실험적 연구
김바다(Bada Kim),조일환(Ilhwan Jo),이대엽(Daeyup Lee) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The interest in air pollution and ultrafine dust is increasing. Emission regulations for automobiles and construction machinery are being strengthened globally. The blowby gas discharged from the crankcase of the engine is a gas that passes through the piston-cylinder gap and escapes into the crankcase. In the CCV ventilation system, carbon is deposited in the diffuser of the turbocharger wheel and the 압축기 housing, which lowers the charging efficiency from a long-term point of view and adversely affects engine performance and emission. This phenomenon is defined as Turbocharger Fouling or Turbocharger Oil Coking. In this study, the engine test was conducted on the dynamometer to investigate the mechanism and the root cause of the turbocharger fouling.