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낮은 터빈관성과 늦은 흡기밸브 전략이 가솔린 엔진의 정상상태 및 과도운전 성능에 미치는 영향
박찬수(Chansoo Park),신지용(Ji Yong Shin),배충식(Choongsik Bae),Motoki Ebisu 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Inherent requirement of high specific power of downsized gasoline engine makes turbocharger became a core component in its system. However, delay of response under transient operation due to turbocharger inertial loss and increase of knocking tendency due to high pressure and temperature in cylinder were always pointed out as main draw backs. In this study, potential benefits of low inertia titanium aluminum (TiAl) turbine wheel turbocharger under steadystate and transient conditions were studied. Transient response reduction by using low inertia turbine wheel turbocharger was experimented and analyzed. In addition, fuel consumption of TiAl and conventional Inconel turbine wheel turbocharger under same torque condition was compared. The results showed that low inertia TiAl turbocharger reduced around 22 % reduction of transient response. However, fuel consumption under steady-state boosting condition with TiAl turbocharger was deteriorated due to lower turbine efficiency. In order to find the way to improve steady-state fuel consumption with TiAl turbocharger, intake valve timing was changed to find out the in-cylinder scavenging benefit of low inertia turbocharger under limited valve overlap period. The results showed that TiAl turbocharger have more fuel consumption benefit under limited valve overlap period than that of conventional one.