Data from two engines with distinct stratified-charge combustion systems are presented. One uses an air-forced injection system with a bowl-in-piston combustion chamber. The other is a liquid-only, high-pressure injection system which uses fluid dynamics coupled with a shaped piston to achieve stratification. The fuel economy and emission characteristics were very similar despite significant hardware differences.The contributions of indicated thermal efficiency, mechanical friction, and pumping work to fuel economy are investigated to elucidate where the efficiency gains exist and in which categories further improvements are possible. Emissions patterns and combustion phasing characteristics of stratified-charge combustion are also discussed.
Stratified-Charge Engine Fuel Economy and Emission Characteristics
Sae Technical Papers
International Fall Fuels and Lubricants Meeting and Exposition ; 1998
1998-10-19
Conference paper
English
Stratified-charge engine fuel economy and emission characteristics
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