Increase of efficiency of SI engine through the implementation of thermodynamic cycle with additional expansion

• Autorzy: Noga M. , Sendyka B.

Identyfikatory

DOI

10.2478/bpasts-2014-0034

• Języki publikacji: EN

Abstrakty

EN

The paper presents the theoretical basis and practical implementation of the concept of a five-stroke cycle where an additional expansion of the working medium is achieved in a separate cylinder. The work, carried out at the Cracow University of Technology, constitutes a development of the idea of five-stroke engine. This paper proposes a new theoretical thermodynamic cycle that describes the processes occurring in a five-stroke engine. It has been taken into consideration that the expansion ratio of the engine is twice the compression ratio. At the next step an analysis of the thermodynamic cycle with particular emphasis on its thermal efficiency compared to efficiency of four-stroke engine has been shown. In the second part of the article selected research results of the five-stroke engine built based on the existing four-cylinder spark ignition engine have been presented. A comparison of the total efficiency obtained by the engine in the four- and five-stroke version has been provided. Similar comparisons for specific emission of the selected exhaust components have also been given.

Słowa kluczowe

EN

innovative five-stroke engine cycle; Carnot cycle; Otto cycle; five-stroke engine; additional expansion; increase of thermal efficiency of the five-stroke engine cycle

• Wydawca: Polska Akademia Nauk, Wydział IV Nauk Technicznych
• Czasopismo: Bulletin of the Polish Academy of Sciences. Technical Sciences
• Rocznik: 2014
• Tom: Vol. 62, nr 2
• Strony: 349--355
• Opis fizyczny: Bibliogr. 8 poz., tab., wykr., rys., fot.

Twórcy

autor

Noga M.

• Faculty of Mechanical Engineering, Cracow University of Technology, Institute of Automobiles and Internal Combustion Engines, 37 Jana Pawła II Ave., 31-864 Krakow, Poland

autor

Sendyka B.

• Faculty of Mechanical Engineering, Cracow University of Technology, Institute of Automobiles and Internal Combustion Engines, 37 Jana Pawła II Ave., 31-864 Krakow, Poland

Bibliografia

• [1] K. Hirose, T. Ueda, T. Takaoka, and Y. Kobayashi, “The highexpansion-ratio gasoline engine for the hybrid passenger car”, JSAE Review 20 (1), 13–21 (1999).
• [2] J. Zhao and M. Xu, “Fuel economy optimization of an Atkinson cycle engine using genetic algorithm”, Applied Energy 105, 335–348 (2013).
• [3] R. Ebrahimi, “Performance of an endoreversible Atkinson Cycle with variable specific heat ratio of working fluid”, J. American Science 6 (2), 12–17 (2010).
• [4] G. Schmitz, Five-stroke Internal Combustion Engine, Patent No. 6553977B2, United States Patent and Trademark Office, Alexandria, 2003.
• [5] T. Rychter and A. Teodorczyk, Theory of Internal Combustion Engines, WKŁ, Warsaw, 2006, (in Polish).
• [6] S. Wiśniewski, Technical Thermodynamics, WNT, Warsaw, 2005, (in Polish).
• [7] M. Noga and B. Sendyka, “New design of the five-stroke SI engine”, J. KONES Powertrain and Transport 20 (1), 239–246 (2013).
• [8] J. Mysłowski, Charging Internal Combustion Engines, WKŁ, Warsaw, 2011, (in Polish).