The advantages of gasoline direct-injection are intake air cooling due to fuel vaporization which reduces knocking, additional degrees of freedom in designing a stratified injection mixture, and capability for retarded ignition timing which shortens catalyst light-off time. Stratified mixture combustion designs often require complicated piston shapes which disturb the fluid flow in the cylinder, leading to power reduction, especially in turbocharged gasoline direct-injection engines. Our research replaced the conventional shell-type shallow cavity piston with a dog dish-type curved piston that includes a small lip to facilitate stratification and minimize flow disturbance. As a result, stable stratified combustion and increased power were both achieved.
New Combustion Concept for Turbocharged Gasoline Direct-Injection Engines
Sae Int. J. Engines
SAE 2014 World Congress & Exhibition ; 2014
Sae International Journal of Engines ; 7 , 2 ; 551-559
2014-04-01
9 pages
Conference paper
English
New Combustion Concept for Turbocharged Gasoline Direct-Injection Engines
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