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Pushbelt CVT Efficiency Improvement Potential of Servo-electromechanical Actuation and Slip Control
Technical Paper
2004-40-0049
Sector:
Language:
English
Abstract
By using the ability to shift to high overdrive ratios, a CVT
equipped vehicle can outperform the fuel economy of its counterpart
with conventional automatic transmission. A further signi cant
reduction of fuel consumption can be obtained by reducing
transmission power loss. The main sources of power loss are well
known to be losses inside the V-belt variator and losses caused by
driving the hydraulic pump. Signi - cant reduction of these losses
will increase the attractiveness of the V-belt type CVT.
This paper rst analyses the most important loss contributions
present in a reference transmission and how they depend on
actuation and control properties, like pump driving power,
over-clamping and variator slip. Based on this analysis, actuation
and control improvements will be proposed. The effciency increase
is presented, that can be expected when the hydraulic pump is
replaced by a servo-electromechanical actuation system, and when
variator slip control is introduced. The effciency benefit is shown
to be substantial, especially at part load conditions. At 25 % of
rated load the CVT losses are halved, whereas at full load, a
reduction of 25 % can be expected.
The proposed servo-electromechanical actuation system is
currently in the realization phase, as well as the slip control
technique. Experimental results will be reported on when
available.
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Authors
- P. A. Veenhuizen - Technische Universiteit Eindhoven
- B. Bonsen - Technische Universiteit Eindhoven
- T.W.G.L. Klaassen - Technische Universiteit Eindhoven
- P.H.W.M. Albers - Technische Universiteit Eindhoven
- C. Changenet - Ecole Catholique Des Arts Et Metiers
- S. Poncy - Ecole Catholique Des Arts Et Metiers