Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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A Study on the Dynamic Behavior of a 2-step Variable Valve Switching System for Automotive Engines

자동차 엔진용 2단 가변밸브 기구의 스위칭 시스템 동적 거동에 관한 연구

  • Kim, Dongil (Graduate School of Mechanical Engineering, University of Ulsan) ;
  • Kim, Dojoong (Department of Mechanical Engineering, University of Ulsan)
  • 김동일 (울산대학교 대학원 기계공학부) ;
  • 김도중 (울산대학교 기계공학부)
  • Received : 2013.12.10
  • Accepted : 2014.05.02
  • Published : 2014.09.01
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Abstract

Variable valve actuation system is one of the widely used techniques to improve the fuel efficiency and power of automotive engines. 2-step variable valve actuation systems are also paid attention for the application to direct acting type valve train systems. Besides its advantages in size, weight, relatively simple structure, ets, however, 2-step variable valve actuation system has inherent disadvantages in dynamic instability of switching system to alter discontinuous lift modes. In this study, both experimental and analytical studies are performed to understand the dynamic behavior of a switching mechanism of a 2-step variable valve actuation system, and present a design method to improve its dynamic instability.

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References

  1. H. Tagami, Y. Yasui, H. Sato and H. Ito, "Management System for Continuously Variable Valve Lift Gasoline Engine," SAE 2007-01-1200, 2007.
  2. R. Flierl and M. Kluting, "The Third Generation of Valvetrains - New Fully Variable Valvetrains for Throttle-free Load Control," SAE 2000-01-1227, 2000.
  3. S. Takemura, S. Aoyama, T. Sugiyama, T. Nohara, K. Moteki, M. Nakamura and S. Hara, "A Study of a Contrinuous Variable Valve Event and Lift(VEL) System," SAE 2001-01-0243, 2001.
  4. K. Ha, W. Kim, C. Lee, H. Kim, M. Choi, D. Han, I. Suh, B. Kim and D. Kim, "Development of Continuously Variable Valve Lift (CVVL) Engine," KSAE08-S0012, pp.70-75, 2008.
  5. P. K. Heuser, J. Reinicke-Murmann, R. Erz, U. Peter and O. Bocker, "Variable Valve Actuation Switchable and Continuously Variable Valve Lifts," SAE 2003-01-0026, 2003.
  6. H. Kim, J. Shim and J. Lee, "Type Synthesis of Variable Valve Lift Mechanism Using Graph Theory," KSAE Fall Conference Proceedings, pp.1647-1652, 2006.
  7. C. Park, Report on the Trend of Patent about Variable Valve Timing Apparatus, Korea Institute of Patent Information, 2003.
  8. J. E. T. Penny, J. D. Penny and G. Lindfield, Numerical Methods Using Matlab, Prentice Hall, New Jersey, 1999.
  9. B. D. Hahn and D. T. Valentine, Essential Matlab for Engineers and Scientists 3/e, Elsevier Science, Burlington, 2007.