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Half toroidal continuously variable transmission: trade-off between dynamics of ratio variation and efficiency

Florian Verbelen UGent, Stijn Derammelaere UGent, Peter Sergeant UGent and Kurt Stockman UGent (2017) MECHANISM AND MACHINE THEORY. 107. p.183-196
abstract
This paper investigates the trade-off between efficiency and dynamics of CVT's. Energy efficiently varying the speed ratio of the CVT while maintaining the dynamic requirements is of primordial importance to fully utilize the advantages of the CVT in a drivetrain. Although the toroidal CVT is thoroughly discussed in literature, few articles describe its behavior during ratio variation. Therefore, in this paper a procedure is proposed to achieve optimal ratio variation in terms of settling time and efficiency with a half toroidal CVT. The key concept on which the procedure is based is the expression of the maximum output torque of the CVT. It turns out that the given method offers the fastest possible speed ratio variation for given constraints without excessive increase in slip and thus limited loss in efficiency. The most important constraint proves to be the clamping force which has a profound impact on the resulting dynamics and efficiency of the CVT. The paper indicates that higher clamping forces increase the dynamics of the CVT at a certain cost of loss in efficiency which implies that there is a trade-off between efficiency and dynamics.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
journal title
MECHANISM AND MACHINE THEORY
MAMT
volume
107
pages
183 - 196
publisher
Elsevier
ISSN
0094-114X
DOI
10.1016/j.mechmachtheory.2016.09.013
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8109345
handle
http://hdl.handle.net/1854/LU-8109345
alternative location
http://www.sciencedirect.com/science/article/pii/S0094114X16302476
date created
2016-10-11 10:42:07
date last changed
2016-12-19 15:45:40
@article{8109345,
  abstract     = {This paper investigates the trade-off between efficiency and dynamics of CVT's. Energy efficiently varying the speed ratio of the CVT while maintaining the dynamic requirements is of primordial importance to fully utilize the advantages of the CVT in a drivetrain. Although the toroidal CVT is thoroughly discussed in literature, few articles describe its behavior during ratio variation. Therefore, in this paper a procedure is proposed to achieve optimal ratio variation in terms of settling time and efficiency with a half toroidal CVT. The key concept on which the procedure is based is the expression of the maximum output torque of the CVT. It turns out that the given method offers the fastest possible speed ratio variation for given constraints without excessive increase in slip and thus limited loss in efficiency. The most important constraint proves to be the clamping force which has a profound impact on the resulting dynamics and efficiency of the CVT. The paper indicates that higher clamping forces increase the dynamics of the CVT at a certain cost of loss in efficiency which implies that there is a trade-off between efficiency and dynamics.},
  author       = {Verbelen, Florian and Derammelaere, Stijn and Sergeant, Peter and Stockman, Kurt},
  issn         = {0094-114X},
  journal      = {MECHANISM AND MACHINE THEORY},
  language     = {eng},
  pages        = {183--196},
  publisher    = {Elsevier},
  title        = {Half toroidal continuously variable transmission: trade-off between dynamics of ratio variation and efficiency},
  url          = {http://dx.doi.org/10.1016/j.mechmachtheory.2016.09.013},
  volume       = {107},
  year         = {2017},
}

Chicago
Verbelen, Florian, Stijn Derammelaere, Peter Sergeant, and Kurt Stockman. 2017. “Half Toroidal Continuously Variable Transmission: Trade-off Between Dynamics of Ratio Variation and Efficiency.” Mechanism and Machine Theory 107: 183–196.
APA
Verbelen, F., Derammelaere, S., Sergeant, P., & Stockman, K. (2017). Half toroidal continuously variable transmission: trade-off between dynamics of ratio variation and efficiency. MECHANISM AND MACHINE THEORY, 107, 183–196.
Vancouver
1.
Verbelen F, Derammelaere S, Sergeant P, Stockman K. Half toroidal continuously variable transmission: trade-off between dynamics of ratio variation and efficiency. MECHANISM AND MACHINE THEORY. Elsevier; 2017;107:183–96.
MLA
Verbelen, Florian, Stijn Derammelaere, Peter Sergeant, et al. “Half Toroidal Continuously Variable Transmission: Trade-off Between Dynamics of Ratio Variation and Efficiency.” MECHANISM AND MACHINE THEORY 107 (2017): 183–196. Print.