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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)
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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.

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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 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.
@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},
}

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