모사 EGR 환경에서 다단점화 전략이 직접 분사식 불꽃 점화 엔진의 연소 성능에 미치는 영향

Abstract

This study compared the combustion characteristics of a commercial ignition coil and two multi-stage ignition coils in a single-cylinder DISI engine. The multi-stage ignition coils each comprise two coils and operate in simultaneous (S-mode) and continuous (C-mode) modes; simulated EGR was applied to create a combustion-unstable environment. At 30% EGR, the S-mode showed lower combustion pressure, longer combustion duration, and reduced combustion stability than the commercial ignition coil, resulting in higher indicated specific fuel consumption. The C-mode exhibited performance comparable to the commercial ignition coil at 30% EGR. At 35% EGR, the C-mode maintained higher combustion pressure and shorter ignition delay, yielding lower IMEP COV and an ISFC reduction exceeding 10% relative the commercial ignition coil.