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Thermodynamic Analysis of an Over-Expanded Engine
Technical Paper
2004-01-0617
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
When the exhaust valve of a conventional spark ignition engine opens at the end of the expansion stroke, a large quantity of high pressure exhaust gas is freed to the atmosphere, without using its availability. An engine that could use this lost energy should have a better efficiency.
The equations for an over-expanded cycle (Miller cycle) are developed in this paper, together with equations for the Otto cycle, diesel cycle and dual cycle, all at part load, so they can be compared.
Furthermore, indicated cycle thermodynamical comparisons of a S.I. engine at part load (Otto cycle at half load), a S.I. engine at WOT (with half displacement) and two over-expanded S.I. engines (with different compression strokes) are examined and compared, with the aim of extending the referred theoretical cycle comparisons.
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Citation
Martins, J., Uzuneanu, K., Ribeiro, B., and Jasasky, O., "Thermodynamic Analysis of an Over-Expanded Engine," SAE Technical Paper 2004-01-0617, 2004, https://doi.org/10.4271/2004-01-0617.Also In
References
- Ferguson, C.R. Kirkpatrick, A.T. Internal Combustion Engines J.Wiley&Sons 2001
- Flierl, R. Kluting, M. The Third Generation of Valvetrains-New Fully Variable Valvetrains for Throttle-Free Load Control SAE 2000-01-1227 2000
- Drangel, H. Reinmann, R. Olofsson, E. The Variable Compression (Svc) and the Combustion Control (Scc) - Two Ways to Improve Fuel Economy and Still Comply With World-Wide Emission Requirements SAE 2002-01-0996 2002
- Heywood, B.J. Internal Combustion Engines Fundamentals McGraw-Hill 1988
- Hatamura, K. Hayakawa, M. A study of the improvement effect of Miller-cycle on mean effective pressure limit for high-pressure supercharged gasoline engines JSAE Review 18 1997