小型内燃机与车辆技术
小型內燃機與車輛技術
소형내연궤여차량기술
Small Internal Combustion Engine and Motorcycle
2014年
6期
13-16
,共4页
徐蔡舟%刘杰%王荣吉%王立新%尹建民
徐蔡舟%劉傑%王榮吉%王立新%尹建民
서채주%류걸%왕영길%왕립신%윤건민
高压EGR%泵气功%增压直喷
高壓EGR%泵氣功%增壓直噴
고압EGR%빙기공%증압직분
High pressure EGR%Pump loss%Direct injection turbocharged engine
基于某一直喷增压发动机，研究了EGR对发动机小负荷油耗的影响。结果表明：在改善油耗方面，原发动机使用进气门晚关策略优于使用内部EGR策略；在低转速小负荷工作区域，外部中冷EGR对油耗的贡献主要来自于降低了泵气功，但是过多的EGR气体引入容易导致燃烧不稳；使用高压EGR时，最佳的进排气VVT角度与无EGR时相同。
基于某一直噴增壓髮動機，研究瞭EGR對髮動機小負荷油耗的影響。結果錶明：在改善油耗方麵，原髮動機使用進氣門晚關策略優于使用內部EGR策略；在低轉速小負荷工作區域，外部中冷EGR對油耗的貢獻主要來自于降低瞭泵氣功，但是過多的EGR氣體引入容易導緻燃燒不穩；使用高壓EGR時，最佳的進排氣VVT角度與無EGR時相同。
기우모일직분증압발동궤，연구료EGR대발동궤소부하유모적영향。결과표명：재개선유모방면，원발동궤사용진기문만관책략우우사용내부EGR책략；재저전속소부하공작구역，외부중랭EGR대유모적공헌주요래자우강저료빙기공，단시과다적EGR기체인입용역도치연소불은；사용고압EGR시，최가적진배기VVT각도여무EGR시상동。
An experimental investigation of exhaust gas recirculation (EGR) on fuel consumption of a spark ignition direct inject turbocharged engine under low load is carried out. The results showed operation with intake valve later closure strategy is better than that with inner EGR to improve fuel consumption on this engine. In part load with low speed condition, the high pressure EGR is contributed to fuel consumption which is mainly from low pump loss, but overfull EGR gas easily causes combustion instability. Optimized VVT phases with EGR are the same as without EGR.
