Transactions of Society of Automotive Engineers of Japan
Online ISSN : 1883-0811
Print ISSN : 0287-8321
ISSN-L : 0287-8321
Research Paper
The New Combustion Concept for Turbocharged Gasoline Direct-Injection Engines
Shinichi MitaniSusumu HashimotoHiroshi NomuraRio ShimizuMutsumi Kanda
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2014 Volume 45 Issue 5 Pages 775-780

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Abstract
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.
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© 2014 Society of Automotive Engineers of Japan, Inc.
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