A simulation study on the influence of piston motion patterns on the combustion process of spark-ignition HFPE was conducted to address the knocking problem in HFPE and improve its thermal efficiency. The effects of different piston motion patterns on the combustion process, knocking tendency, and heat-to-work conversion efficiency of HFPE were investigated.
By altering the piston motion pattern to increase the piston's upward velocity and shorten its residence time near top dead center, the knocking tendency and intensity of the engine can be significantly reduced.
Utilizing optimized piston motion patterns, coupled with a high compression ratio of up to 14, the engine's thermal efficiency can be improved to a certain extent.
