CVT Power Transmitting Characteristics and Control Logics for Negative Torque

역방향 토크시 무단변속기 동력전달 특성과 제어로직

  • 송한림 (안산공과대 컴퓨터응용기계설계과) ;
  • 이희라 (성균관대학교 대학원) ;
  • 김현수 (성균관대학교 기계공학부)
  • Published : 2002.01.01

Abstract

In this paper, the power transmitting mechanism for negative torque of the metal V-belt (MVB) CVT were investigated by theoretically analyzing variation of band tension, block compression forces for each of the primary and secondary pulleys. An experimental study was performed to investigate the speed ratio - thrust characteristics for negative torque. The experimental results are in good acoordance with the theoretical results. CVT line pressure control logic was suggested for negative torque based the speed radio - negative torque - thrust characteristics and the thrust ratio curves. The results of this study can be used as basic design materials for developing the CVT control system for negative torque.

Keywords

References

  1. T. Yaegashi, S. Sasaki, T. Abe, 'Toyota Hybrid System : It's Concept and Technologies,' Proc. of FISITA World Automotive Congress, F98TP095, 1998
  2. A. Wolthuis, 'A Hybrid Drive Line with Energy Storage Incorporating Continuous Variable Transmission,' Proc. of FISITA Congress, Beijing, SAE 945142, pp.270-275, 1994
  3. Steven Ashley, 'Is CVT the Car Transmission of the Future?,' Mechanical Engineering, 1994
  4. T. Fuji, T. Kurokawa, S. Kanehara, 'A Study of a Metal Pushing V-Belt Type CVT - Part 1 : Relation Between Transmitted Torque and Pulley Thrust,' SAE 930666, 1993
  5. H. Kim, J. Lee, 'Analysis of Belt Behavior and Slip Characteristics for a Metal V-Belt CVT,' Int. J. of Mechanism and Machine Theory, Vol.29, No.6, pp.865-876, 1994 https://doi.org/10.1016/0094-114X(94)90086-8
  6. H. Asayama, J. Kawai, 'Mechanism of Metal Pushing Belt,' JSAE Review, No.16, pp.137-143, 1995 https://doi.org/10.1016/0389-4304(94)00067-4
  7. H. Lee, H. Kim, 'Analysis of Primary and Secondary Thrusts for A Metal Belt CVT Part I : New Formula for Speed Ratio - Torque - Thrust Relationship Considering Band Tension and Block Compression,' SAE 2000-01-0841, pp.1-9, 2000
  8. N. Hattori, S. Aoyama, S. Kitada, I. Matsuo, 'Functional Design of a Motor Integrated CVT for a Parallel HEV,' SAE 1999-01-9753, 1999
  9. 송한림, 김정철, 김현수, '라인압력 전자화 CVT 차량의 응답특성,' 한국자동차공학회 논문집, Vol.22, pp.191-202, 1998
  10. S. Sakaguchi, E. Kimura, K. Yamamoto, 'Development of an Engine-CVT Integrated Control System,' Int. Congress and Exposition of SAE 1999-01-9754, 1999