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Research Papers

Design Optimization of Input and Output Coupled Power Split Infinitely Variable Transmissions

[+] Author and Article Information
S. Schembri Volpe

 CNH Product Development, viale delle Nazioni 55, 41100 Modena, Italy; DIMEG Politecnico di Bari, Viale Japigia 182, 70125 Bari, Italy; CEMeC Politecnico di Bari, Via Re David 200, 70125 Bari, Italy

G. Carbone, M. Napolitano

 DIMEG Politecnico di Bari, Viale Japigia 182, 70125 Bari, Italy; CEMeC Politecnico di Bari, Via Re David 200, 70125 Bari, Italy

E. Sedoni

 CNH Product Development, viale delle Nazioni 55, 41100 Modena, Italy

J. Mech. Des 131(11), 111002 (Oct 06, 2009) (11 pages) doi:10.1115/1.3179145 History: Received September 08, 2008; Revised May 06, 2009; Published October 06, 2009

The authors present an optimization procedure in designing infinitely variable transmission architectures, which allows them to achieve a significant reduction in power recirculation and, hence, an increase in mechanical efficiency. The focus of this paper is on infinitely variable transmissions used in off-highway vehicles and, in particular, on input and output coupled architectures. The optimized solutions have been analyzed in depth, with particular attention to the power flowing through the infinitely variable unit, which strongly influences the overall efficiency of the transmission. The major result of this study is that the so far neglected output coupled solution, if properly optimized, guarantees very good performance over the entire range of vehicle speed. The analysis then shows that the particular choice of either input or output coupled architecture by itself, or of a mixed solution, strictly depends on the specific application under consideration and that none of them should be discarded a priori.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Circuit schematics of (a) input coupled and (b) output coupled architectures

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Figure 3

Output coupled power split architecture

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Figure 4

Power flow types for the IC architecture

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Figure 5

Power flow types for the OC architecture

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Figure 6

ηIVT as a function of the ratio PIVU/Pin; ηM=0.95

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Figure 7

Control volumes for the IC architecture

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Figure 8

Control volumes for the OC architecture

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Figure 9

Nominal working cycle: (a) normalized torque Tin/Tmax and (b) normalized power Pin/Pmax

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Figure 10

Weighting function wi versus speed distribution

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Figure 19

Comparison between the IC and OC optimized solutions obtained with the DE algorithm

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Figure 12

Normalized TIVU,in for the IC architecture

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Figure 11

Normalized PIVU for the IC architecture

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Figure 2

Input coupled power split architecture

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Figure 13

Normalized TIVU,out for the IC architecture

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Figure 14

τIVU versus τIVT for the IC architecture

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Figure 15

Normalized PIVU for the OC architecture

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Figure 16

Normalized TIVU,in for the OC architecture

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Figure 17

Normalized TIVU,out for the OC architecture

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Figure 18

τIVU versus τIVT for the OC case

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