Kinematic synthesis of variable compression ratio engine mechanism

Young Kwang Mo, Jae Kyung Shim, Min Seok Jo

Research output: Contribution to conferencePaperpeer-review


Rising interest in automotive exhaust gas problems has triggered active researches on eco-friendly automobiles. A variable compression ratio (VCR) engine is one of the eco-friendly automotive technologies. The VCR engine increases compression ratio at low load region to improve thermal efficiency, while it decreases compression ratio in high load region to prevent knocking, which can decrease exhaust emissions and increase fuel-economy. In this paper, a new variable compression ratio engine mechanism with multiple joints is developed via a systematic kinematic approach. For this, the kinematic graphs of mechanisms wiht 7 links and 8 joints are enumerated and the most sitable mechanisms are selected. By mering the joints, a new VCR engine mechanism type is proposed and analyzed.

Original languageEnglish
Publication statusPublished - 2016
Event36th FISITA World Automotive Congress, 2016 - Busan, Korea, Republic of
Duration: 2016 Sept 262016 Sept 30


Other36th FISITA World Automotive Congress, 2016
Country/TerritoryKorea, Republic of

Bibliographical note

Publisher Copyright:
© 2016, FISITA. All rights reserved.


  • Degrees of freedom
  • Dimensional synthesis
  • Graph theory
  • Type synthesis
  • Variable compression ratio engine

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality


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