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Fuel Efficiency Improvements from Lean, Stratified Combustion with a Solenoid Injector
ISSN: 1946-3936, e-ISSN: 1946-3944
Published April 20, 2009 by SAE International in United States
Citation: Husted, H., Piock, W., and Ramsay, G., "Fuel Efficiency Improvements from Lean, Stratified Combustion with a Solenoid Injector," SAE Int. J. Engines 2(1):1359-1366, 2009, https://doi.org/10.4271/2009-01-1485.
In light of the growing emphasis on CO2 emissions reduction, Delphi has undertaken an internal development program to show the fuel economy benefits of lean, stratified combustion with its outwardly-opening solenoid injector in a vehicle environment. This paper presents the status of this ongoing development activity which is not yet completed. Progress to date includes a logical progression from single- and multi-cylinder dynamometer engines to the vehicle environment. The solenoid-actuated injector used in this development has an outwardly-opening valve group to generate a hollow-cone spray with a stable, well-defined recirculation zone to support spray-guided stratification in the combustion chamber. The engine management system of the development vehicle was modified from series-production configuration by changing the engine control unit to permit function development and calibration. The resulting full-size, V6-engine vehicle achieves significant fuel savings compared to homogeneous stoichiometric operation, while showing the potential to be the best-value Powertrain solution through the innovative use of solenoid injector technology.
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