期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：252
期号：3
页码：1-8
DOI：10.1088/1755-1315/252/3/032147
出版社：IOP Publishing
摘要：The energy conservation strategy with EGR dilution coupled high expansion ratio was discussed for improving the fuel economy of a 1.8 L turbocharged GDI engine. A 1-D simulation engine model coupled with LP-EGR system was modelled and verified by the bench test. The influence of different GCR and EGR rates on BSFC (Brake Specific Fuel Consumption) and torque was analysed based on the simulation calculations. Results show that the BSFC is reduced by much higher GCR design but the risk of combustion detonation is prone to rising. Then two detonation inhibition methods of LIVC (late intake valve closing) and EGR were compared. Results show that either delaying of LIVC angle from 15°CA to 55 °CA or increasing of EGR rate from 0 to 15% can suppress the detonation, but the two methods will reduce power performance and fuel economy benefits of increasing GCR without other control parameters adjustments like ignition timing. Even not EGR coupled high expansion ratio cycle has better fuel economy performance than the original engine.
