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Sabre: A Direct Injection 3-Cylinder Engine with Close-Spaced Direct Injection, Swirl-Enhanced Combustion and Complementary Technologies
Published May 21, 2008 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Meeting
The paper describes 'Saber,' a 3-cylinder engine encompassing a combination of synergistic technologies to realize low CO2 in a practical automotive application. The rationale behind the adoption of its close-space homogeneous 'second generation' direct-injection combustion system is described and the decision not to target high BMEP as the primary route to low fuel consumption is explained. Instead, mild downsizing combined with throttling loss reduction and turbulence manipulation enabled by a switching valve train is employed. This provides packaging benefits and reduced high-load fuel consumption as a result of a lower boost requirement. The interaction of spray and air motion in the combustion system is briefly discussed.