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“Doing More with Less” - The Fuel Economy Benefits of Cooled EGR on a Direct Injected Spark Ignited Boosted Engine
Technical Paper
2010-01-0589
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Due to the rising costs of fuel and increasingly stringent regulations, auto makers are in need of technology to enable more fuel-efficient powertrain technologies to be introduced to the marketplace. Such powertrains must not sacrifice performance, safety or driver comfort. Today's engine and powertrain manufacturers must, therefore, do more with less by achieving acceptable vehicle performance while reducing fuel consumption. One effective method to achieve this is the extreme downsizing of current direct injection spark ignited (DISI) engines through the use of high levels of boosting and cooled exhaust gas recirculation (EGR).
Key challenges to highly downsized gasoline engines are retarded combustion to prevent engine knocking and the necessity to operate at air/fuel ratios that are significantly richer than the stoichiometric ratio. As a result of changes to the combustion process, cooled EGR offers the potential benefit of engine knock reduction and the elimination of overfuelling. This allows higher compression ratios and the production of more torque at low engine speeds, which in turn enables downsized fuel-efficient engines to become more accepted in the market place. Low pressure EGR was chosen for this research project due to the advantages of being able to drive EGR over a large area of the engine speed and load map, due to the differential pressure between the turbine and compressor. In this paper the fuel economy savings on SI engines as a direct result of adding low pressure cooled EGR to the combustion process are considered.
Laboratory tests were run in order to compare engine efficiency and performance with and without cooled EGR. A 3.2 liter V6 spark ignited engine was used for the testing; both E0 (gasoline) and E85 fuels were studied. The testing was conducted across the entire range of engine speeds and loads. The laboratory tests have shown that cooled EGR is a key technology for enabling downsized engines and provide a means to meet the market requirement of “doing more with less”.
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Kaiser, M., Krueger, U., Harris, R., and Cruff, L., "“Doing More with Less” - The Fuel Economy Benefits of Cooled EGR on a Direct Injected Spark Ignited Boosted Engine," SAE Technical Paper 2010-01-0589, 2010, https://doi.org/10.4271/2010-01-0589.Also In
SI Combustion and Direct Injection SI Engine Technology, 2010
Number: SP-2278; Published: 2010-04-13
Number: SP-2278; Published: 2010-04-13
References
- Cruff, L. Harris, R. Williams, M. Krueger, U. et al. “EBDI® - Application of a Fully Flexible High BMEP Downsized Spark Ignited Engine,” SAE Technical Paper 2010-01-0587 2010
- Mueller, Rolf Feldhaus, Georg Pantow, Dr. Eberhard Edwards, Dr. Simon Finkeldei, Thomas Trapp, Dr. Ralph Neubauer, Matthias Kapus, Dr. Paul Reducing the CO2 Emissions of a Turbocharged DI Gasoline Engine by Using Cooled EGR and Optimized Cooling System Control the Aachener Kolloquium Fahrzeug- und Motortechnik 2007
- Roth, David Zhang, Rong Sauerstein, Rolf Becker, Michael Borg Warner Engine Systems Group “New Aspects of Application of Hybrid EGR Systems to Turbocharged GDI Engines” Aachener Kolloquium Fahrzeug- und Motorentechnik 2009
- International Fuel Quality Center www.ifqc.org
- Krueger, U. Edwards, S. Pantow, E. Lutz, R. et al. “High Performance Cooling and EGR Systems as a Contribution to Meeting Future Emission Standards,” SAE Int. J. Engines 1 1 756 789 2008
- Turner, J.W.G. Pearson, R.J. Curtis, R. Holland, B. “Improving Fuel Economy in a Turbocharged DISI Engine Already Employing Integrated Exhaust Manifold Technology and Variable Valve Timing,” SAE Technical Paper 2008-01-2449 2008
- Kawamoto, N. Naiki, K. Kawai, T. Shikida, T. et al. “Development of New 1.8-Liter Engine for Hybrid Vehicles,” SAE Technical Paper 2009-01-1061 2009
- Cairns, Alasdair Fleischer, Tristan Blaxill, Hugh MAHLE Powertrain Ltd. “Alternative Methods for High Load Knock Reduction in Turbocharged Gasoline Engines” JSAE Annual Congress Proceedings Spring