Browse > Article

Optimal Engine Operation by Shift Speed Control of a CVT  

Lee, Heera (Graduate Student, School of Mechanical Engineering, Sungkyunkwan University)
Kim, Hyunsoo (School of Mechanica Engineering, Sungkyunkwan University)
Publication Information
Journal of Mechanical Science and Technology / v.16, no.7, 2002 , pp. 882-888 More about this Journal
Abstract
In this paper, an algorithm to increase the shift speed is suggested by increasing the line pressure for a metal belt CVT. In order to control the shift speed, an algorithm to calculate the target shift speed is presented from the modified CVT shift dynamics. In applying the shift speed control algorithm, a criterion is proposed to prevent the excessive hydraulic loss due to the increased line pressure. Simulations are performed based on the dynamic models of the hydraulic control valves, powertrain and the vehicle. It is found from the simulation results that performance of the engine operation can be improved by the faster shift speed, which results in the improved fuel economy by 2% compared with that of the conventional electronic control CVT in spite of the increased hydraulic loss due to the increased line pressure.
Keywords
CVT (Continuously Variable Transmission); Line Pressure; Shift Speed;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Serrarens, A. F. A. and Veldpaus, F. E., 1999, 'Powrtrain Control of a Flywheel Assisted Driveline with CVT,' Proceedings of the International Congress on Continuously Variable Power Transmission, pp. 225-230
2 Ide, T., Uchiyama, H. and Kataoka, R., 1996, 'Experimental Investigation on Shift Speed Characteristics of a Metal V-Belt CVT,' Proceedings of the International Congress on Continuously Variable Power Transmission, pp.59-64
3 Kim, T. and Kim, H., 2000, 'Integrated Engine-CVT Control Considering Powertrain Response Lag in Acceleration,' KSME International Journal, Vol. 14, No. 7, pp. 764-772   과학기술학회마을   DOI
4 Lee, H. and Kim, H., 2001, 'Shift Speed Improvement of a Metal-Belt CVT,' KSME International Journal, Vol. 15, No. 12, pp. 1623-1629   DOI
5 Maaike van der Laan, 1999, 'Model-Based Variator Control Applied to a Belt Type CVT,' Proceedings of the International Congress on Continuously Variable Power Transmission,pp.105-110
6 Vroemen, B. G., 2001, 'Component Control for The Zero Inertia Powertrain,' Ph. D dissertation, Technische Universiteit Eindhoven, Netherlands
7 Vroemen, B. G. and Veldpaus, F. E., 1999, 'Hydraulic Circuit Design for CVT Control,' Proceedings of the International Congress on Continuously Variable Power Transmission, pp. 111-116
8 Vroemen, B.G., Serrarens, A. F. A. and Veldpaus, F. E., 2001, 'Hierarchical Control of the Zero Inertia Powertrain,' JSAE Review, Vol. 22, pp. 519-526   DOI   ScienceOn