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16권 4호 143-150 2008 [한국자동차공학회 논문집 ]

제목 하이브리드용 가솔린 엔진에서 On/Off 방식 EGR적용 및 최적 EGR 율에 관한 연구
분야 전기동력자동차
언어 Korean
저자 박철웅(한국기계연구원), 김창기(한국기계연구원), 최영(한국기계연구원)
Key Words Exhaust gas recirculation(배기가스재순환), Gasoline-hybrid engine(하이브리드용 가솔린엔진), Specific fuel consumption(연료소비율), Combustion stability(연소안정성), EGR rate(EGR 율)
초록 EGR(exhaust gas recirculation) is an attractive means of improving the fuel economy of spark ignition engines, as it offers the benefits of charge dilution (lower pumping and cooling losses) while allowing stoichiometric fuelling to be retained for applications using the three-way catalysts. However, the occurrence of excessive cyclic variation with high EGR normally prevents substantial fuel economy improvements from being achieved in practice. Therefore, the optimum EGR rate in Gasoline-Hybrid engine should be carefully determined in order to achieve low fuel consumption and low exhaust emission. In this study, 2 liters gasoline engine with E-EGR system was used to investigate the effects of EGR on fuel economy, combustion stability, engine performance and exhaust emissions. EGR tolerance with load variation was found to be more sensitive than with rpm variation. With optimal EGR rates, the fuel consumption was improved by 5.5% while a combustion stability was guaranteed.
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