“…As the main source of power for passenger vehicles, gasoline engines have played a pivotal role worldwide for a long time. With the increasingly stringent fuel consumption regulations, more and more technologies of the gasoline engine are being studied to improve the fuel economy performance, such as high-compression-ratio technology, fuel injection technology, EGR technology, variable valve technology (VVT), supercharging technology, etc. − Among them, the combination of DVVT and high-compression-ratio technology enables the engine to work in the Miller cycle or Atkinson cycle, greatly improving the fuel economy of the gasoline engine, which has become one of the current mainstream technical solutions and realized mature industrial application. − At the same time, many scholars have conducted research on this technical solution, and analyzed the effect of Miller cycle combined with high compression ratio on gasoline engine combustion and thermal efficiency improvement. − Compared to the original production engine with CR 9.3, the fuel economy is improved at low load by 7.4% after the application of CR12.0 and EIVC . The authors have studied the Miller cycle of turbocharged gasoline engines before.…”