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하이브리드 파워트레인의 엔진 재시작 및 감속 구간에서 탄화수소 배출물 및 엔진 제어 특성 분석
온형석(Hyungseuk Ohn),유성은(Seongeun Yu),민경덕(Kyoungdoug Min) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Stringent regulation of exhaust emission and improvement of fuel economy have become major issues in the automotive industry. Hybrid electric vehicle (HEV) can be one of the crucial alternative plans over current conventional vehicle, but they have drawbacks such as the increase of engine out total hydrocarbon (THC) emissions and the deterioration of combustion stability at frequent engine stop and restart. This study performs experimental investigation to obtain a better understanding of THC emission characteristic at engine restart and deceleration driving on a HEV powertrain of parallel motor/generator type. Using a fast response Flame Ionization Detector (FFID) and specified tool for cycle by cycle and cylinder to cylinder, the combustion and engine control characteristic was analyzed during transient state of hybrid powertrain. The experimental conditions cover variation of high voltage battery State of Charge (SoC), spark ignition timing and injected fuel mass. As an experimental result, we can unearth the effects of spark ignition timing and injected fuel mass control for combustion stability during engine restart.
온형석(Hyungseuk Ohn),김용래(Yongrae Kim),민경덕(Kyoungdoug Min) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Characteristics of auto-ignition of diesel sprays were investigated experimentally, especially concerning the early injection of HCCI combustion, Ignition delay of diesel sprays was measured in a combustion-type constant volume vessel under various conditions. Oxygen concentration was varied to investigate the effect of EGR and injection pressure was varied from 600bar to 1200bar. From the experimental result, rate of ignition delay decrease for increasing temperature was declined at 800K-900K range, which is correspond to the NTC region of hydrocarbon fuel. Ignition delay was increased as the oxygen concentration increased and ambient gas pressure decreased, But ignition delay was not influenced largely by the injection pressure at these experimental conditions.