CAJ | 학술논문

针对增压直喷汽油机因降低几何压缩比而制约了燃油经济性改善的问题，通过应用进气门晚关（LIVC）策略，有效地抑制了高压缩比直喷汽油机的爆震并改善了其燃油经济性，但试验中发现，LIVC策略造成了高炭烟排放，为了进一步改进油耗并抑制炭烟排放，研究了EGR对油耗与炭烟的影响。在1000 r/min ，pme ＝1．32 M Pa这一低速大负荷工况下，试验结果表明，LIVC结合EGR技术显著抑制了爆震，降低油耗8．6％，同时能够有效缓解LIVC带来的高炭烟问题。
침대증압직분기유궤인강저궤하압축비이제약료연유경제성개선적문제，통과응용진기문만관（LIVC）책략，유효지억제료고압축비직분기유궤적폭진병개선료기연유경제성，단시험중발현，LIVC책략조성료고탄연배방，위료진일보개진유모병억제탄연배방，연구료EGR대유모여탄연적영향。재1000 r/min ，pme ＝1．32 M Pa저일저속대부하공황하，시험결과표명，LIVC결합EGR기술현저억제료폭진，강저유모8．6％，동시능구유효완해LIVC대래적고탄연문제。
For the fuel economy limited by downsizing the boost and direct injection gasoline engine ,the late intake valve clos-ing (LIVC) strategy was applied .The strategy suppressed the knock and improved the fuel economy effectively ,but led to the high soot emission of direct injection gasoline engine with high compression ratio .The influences of EGR on fuel consumption and soot were further analyzed .At 1 000 r/min and 1 .32 MPa pme ,LIVC together with EGR suppressed the knock dramatical-ly ,reduced the fuel consumption by 8 .6% and alleviated the high soot caused by the LIVC .