Browse > Article

Ratio Control of CVT by Considering the CVT System Efficiency  

Ryu, Wan-Sik (School of Mechanical Engineering, Sungkyunkwan University)
Kim, Hyun-Soo (School of Mechanical Engineering, Sungkyunkwan University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.14, no.4, 2006 , pp. 157-163 More about this Journal
Abstract
A modified ratio control algorithm is proposed for the improvement of the fuel economy for a metal belt CVT. In the modified ratio control algorithm, the CVT ratio is controlled to operate the engine on the optimal operation region which provides the best efficiency from the view point of the overall efficiency of the engine-CVT system. In order to construct the modified ratio map, the CVT system loss model is used by assuming that the all the loss is attributed to the torque loss. It is found from the simulation results that the fuel economy by the modified ratio control algorithm is improved by 5.5 percents compared with the existing ratio control.
Keywords
CVT; Ratio control; Efficiency; Torque loss;
Citations & Related Records
연도 인용수 순위
  • Reference
1 H. Lee and H. Kim, 'Improvement in Fuel economy for a Parallel Hybrid Electric Vehicle by Continuously Variable Transmission Ratio Control,' Proc. Instn. Mech. Engrs, Part D: Journal Automobile Engineering, Vol.219, pp.43-52, 2005
2 W. Ryu, P. Kim and H. Kim, 'Mechanical Loss Model for a Metal Belt CVT,' Proc. International Pacific Conference on Automotive Engineering, pp.981-986, 2005
3 T. Kim and H. Kim, 'Integrated Engine-CVT Control Considering Powertrain Response Lag in Acceleration,' KSME International Journal, Vol.14, No.7, pp.764-772, 2000   과학기술학회마을
4 S. Sakaguchi, E. Kimura and K. Yamamoto, 'Development of an Engine-CVT Integrated Control System,' SAE 1999-01-0754, 1999
5 T. Takiyama, 'Engine-CVT-A/F Consolidated Control Using Decoupling Control Theory,' JSAE Review, pp.9-14, 2001
6 B. G. Vroemen, A. F. A. Serrarens and F. Veldpaus, 'Hierarchical Control of the Zero Inertial Powertrain,' JSAE Review, pp.519-526, 2001
7 H. Lee and H. Kim, 'Improvement of Fuel Economy by Shift Speed Control for a Metal Belt Continuously Variable Transmission,' Proc. Instn. Mech. Engrs, Part D: Journal of Automobile Engineering, Vol.216, pp.741-749, 2002
8 M. Yasuoka, M. Uchida, S. Katakura and T. Yoshino, 'An Integrated Control Algorithm for an SI Engine and a CVT,' SAE 1999-01-0752, 1999
9 T. Takiyama and S. Morita, 'Engine-CVT Consolidated Control Using LQI Control Theory,' JSAE Review, pp.251-258, 1999
10 H. Lee and H. Kim, 'Analysis of Primary and Secondary Thrust for a Metal Belt CVT,' SAE 2000-01-0841, 2000