Kinematics of a variable stroke and compression ratio mechanism of an internal combustion engine

  • Caio H. RufinoEmail author
  • Janito V. Ferreira
Technical Paper


The development of automotive propulsion has been guided in recent years by policies for the reduction of pollutant emissions. To comply with the imposed regulations, engine adaptability is one of the most effective strategies for meeting efficiency requirements in the case of the diverse operational conditions found in urban traffic. A variable stroke and compression ratio engine is the solution to this requirement. In addition to its advantages, its design inevitably increases the engine’s complexity. Thus, it is necessary to conduct studies on the feasibility of such a technology. This work describes a variable stroke and compression ratio engine mechanism and presents a developed kinematic model that is used to evaluate the requirements for the implementation of this mechanism. The results of the evaluation confirm the possibility of using this alternative mechanism to obtain a higher efficiency in internal combustion engines.


Internal combustion engine Variable compression ratio Variable stroke engine Kinematics of multi-link mechanisms Flexfuel engines 



The authors would like to express their gratitude to the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) for the support provided through process no 2016/06043-1, a research part of the research center “Prof. Urbano Ernesto Stumpf" (process no 2013/50238-3), and to PSA Peugeot for the financial and technical support provided.


  1. 1.
    Elkholy AH (1995) Variable stroke piston mechanism for spark ignition engines. Int J Veh Design 16(6):570–580Google Scholar
  2. 2.
    Ferreira JV, Rufino CH (2014) Motor de combusto interna com mecanismo que permite controle instantneo sobre a taxa de compresso e a capacidade volumtrica de cada cilindro individualmente e seus usos. Patent INPI BR 10 2014 026240 7Google Scholar
  3. 3.
    Heywood J, MacKenzie D (2015) On the road toward 2050: potential for substantial reductions in light-duty vehicle energy use and greenhouse gas emissions. Massachusetts Institute of TechnologyGoogle Scholar
  4. 4.
    Press WH (2007) Numerical recipes 3rd edition: the art of scientific computing. Cambridge University Press, CambridgezbMATHGoogle Scholar
  5. 5.
    Rufino CH, Ferreira JV (2017) Adjustable stroke length and compression ratio engine. Acta Mechanica et Mobilitatem 2(3):1–11Google Scholar
  6. 6.
    Schiehlen W, Eberhard P (1986) Technische dynamik. Springer, BerlinzbMATHGoogle Scholar
  7. 7.
    Shaik A, Moorthi NV, Rundramoorthy R (2007) Variable compression ratio engine: a future power plant for automobiles—an overview. In: Proc. IMechE part D: automobile engineering, p 221Google Scholar
  8. 8.
    Siegla DC, Siewert RM (1978) The variable stroke engine—problems and promisses. SAE Technical Paper No 780700Google Scholar
  9. 9.
    Siewert RC (1978) Engine combustion at large bore-to-stroke ratios. SAE Technical Paper No 780968Google Scholar
  10. 10.
    Stoecker WF (1980) Design of thermal systems. McGraw Hill Book Company, New YorkGoogle Scholar
  11. 11.
    Walter A, Dolzan P, Quilodrán O, de Oliveira JG, da Silva C, Piacente F, Segerstedt A (2011) Sustainability assessment of bio-ethanol production in Brazil considering land use change, GHG emissions and socio-economic aspects. Energy Policy 39(10):5703–5716CrossRefGoogle Scholar

Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2018

Authors and Affiliations

  1. 1.Laboratory of Biofuel Engines, Department of Computational Mechanics, School of Mechanical EngineeringUniversity of CampinasCampinasBrazil

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