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BMW N53 엔진의 초희박 연소 전략에 관한 연구

오진우, 김홍석, 이석환, 정용일

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Abstract

Recently, a few ultra lean burn GDI(Gasoline direct injection) engines showing good fuel economy have been introduced in the market. The BMW N53 GDI engine is one of these engines, and its ultra lean burn strategy was investigated in this study. The BMW N53 engine uses a spray-guided lean burn concept. In this engine, piezo injectors are located at the center of combustion chamber to form stratified mixture in the vicinity of spark plug. This study showed that brake specific fuel consumption rate is reduced about 11% to 25% by lean combustion mode compared with the homogeneous combustion mode. Spark timing was retarded with the increase of BMEP at the homogeneous combustion mode, but it was fixed at BTDC 15° CAD at the lean combustion mode. This study also showed the fuel injection and valve train strategies for lean combustion of the engine.

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What this paper is about

Recently, a few ultra lean burn GDI(Gasoline direct injection) engines showing good fuel economy have been introduced in the market. The BMW N53 GDI engine is one of these engines, and its ultra lean burn strategy was investigated in this study. The BMW N53 engine uses a spray-guided lean burn concept. In this engine, piezo injectors are located at the center of combustion chamber to form stratified mixture in the vicinity of spark plug. This study showed that brake specific fuel consumption rate is reduced about 11% to 25% by lean combustion mode compared with the homogeneous combustion mode. Spark timing was retarded with the increase of BMEP at the homogeneous combustion mode, but it was fixed at BTDC 15° CAD at the lean combustion mode. This study also showed the fuel injection and valve train strategies for lean combustion of the engine.

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Available abstract

Recently, a few ultra lean burn GDI(Gasoline direct injection) engines showing good fuel economy have been introduced in the market. The BMW N53 GDI engine is one of these engines, and its ultra lean burn strategy was investigated in this study. The BMW N53 engine uses a spray-guided lean burn concept. In this engine, piezo injectors are located at the center of combustion chamber to form stratified mixture in the vicinity of spark plug. This study showed that brake specific fuel consumption rate is reduced about 11% to 25% by lean combustion mode compared with the homogeneous combustion mode. Spark timing was retarded with the increase of BMEP at the homogeneous combustion mode, but it was fixed at BTDC 15° CAD at the lean combustion mode. This study also showed the fuel injection and valve train strategies for lean combustion of the engine.

Key concepts: Lean burn, Automotive engineering, Combustion, Gasoline direct injection, Spark plug, Petrol engine, Fuel efficiency, Homogeneous

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BMW N53 엔진의 초희박 연소 전략에 관한 연구 — Research Paper | ScholarLens