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New Combustion Concept for Turbocharged Gasoline Direct-Injection Engines
ISSN: 1946-3936, e-ISSN: 1946-3944
Published April 01, 2014 by SAE International in United States
Citation: Mitani, S., Hashimoto, S., Nomura, H., Shimizu, R. et al., "New Combustion Concept for Turbocharged Gasoline Direct-Injection Engines," SAE Int. J. Engines 7(2):551-559, 2014, https://doi.org/10.4271/2014-01-1210.
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.