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The Effect of Unconventional Piston Movement on SI Engine Combustion and Emissions
Technical Paper
2005-01-1170
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A major trend in current automotive research is hybridization of the power supply. This combination of electrical machine and combustion engine results, in some hybridization topologies, in a total decoupling of the combustion engine from the transmission. When the engine is decoupled from the transmission a new degree of freedom arises in engine design. The piston movement does not have to follow an evenly rotating shaft any more. It can be altered by the generator to achieve a movement found to be better from the point of efficiency or environmental concerns.
Modelling work showed a potential of lowered NO emissions if the expansion could be delayed. The experimental study, conducted in a two piston Alvar engine, showed that the state of the art electrical machine (EM) propelling one of the crankshafts was too weak to change the crankshaft speed in an extent to give the fast volume changes required to change the emissions of the internal combustion engine (ICE). By running the EM at four times the speed of the dynamometer coupled to the other piston, more unorthodox volume traces were generated and differences in the emissions of the engine were found. None of the possible changed volume traces generated pressure traces showing major changes in the 10-90% heat release rate of the engine. The experiments were conducted at the limit of what the EM was able to achieve at all times.
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Authors
- O. Stenlåås - Heat and Power Engineering Department, Lund Institute of Technology
- O. Erlandsson - Heat and Power Engineering Department, Lund Institute of Technology
- R. Egnell - Heat and Power Engineering Department, Lund Institute of Technology
- B. Johansson - Heat and Power Engineering Department, Lund Institute of Technology
- E. Alm - Industrial Electrical Engineering and Automation Department, Lund Institute of Technology
- M. Alaküla - Industrial Electrical Engineering and Automation Department, Lund Institute of Technology
- F. Mauss - Combustion Physics Department, Lund Institute of Technology
Topic
Citation
Stenlåås, O., Erlandsson, O., Egnell, R., Johansson, B. et al., "The Effect of Unconventional Piston Movement on SI Engine Combustion and Emissions," SAE Technical Paper 2005-01-1170, 2005, https://doi.org/10.4271/2005-01-1170.Data Sets - Support Documents
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References
- Nakayama, K. Tamaki, S. Miki, H Takiguchi, M. “The Effect of Crankshaft Offset on Piston Friction Force in a Gasoline Engine” SAE paper 2000-01-0922 SAE 2000
- Wakabayashi, R. Takiguchi, M. Shimada, T. Mizuno, Y. Yamauchi, T. “The Effect if Crank Ratio and Crankshaft Offset on Piston Friction Losses” SAE paper 2003-01-0983 SAE 2003
- Shin, S. Cusenza, A. Shi, F. “Offset Crankshaft Effects on SI Engine Combustion and Friction Performance” SAE paper 2004-01-0606 SAE 2004
- Erlandsson, O. Lundholm, G. Söderberg, F. Johansson, B. “Demonstrating the Performans and Emission Characteristics of a Variable Compression Ratio, Alvar-Cycle Engine” SAE paper 982682 SAE 1998
- Personal communication Östergrens Elmotor Sept 2003 Feb 2004
- Personal communication Baldor Dec 2003 Feb 2004
- Stenlåås, O. Gogan, A. Egnell, R. Sunden, B. Mauss, F. “The influence of NO on the occurrence of Autoignition in the End-gas of SI-Engines” SAE Paper 2002-01-2699 SAE 2002
- Stenlåås, O. “On the Impact of Piston Motion and In Cylinder Charge Composition on Energy Release, Auto Ignition and Emission Formation in Premixed Charge Internal Combustion Engines” Lund University 2004