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Analysis of planetary gear hybrid powertrain system part 2: Output split system

  • H. YangEmail author
  • B. Kim
  • Y. Park
  • W. Lim
  • S. Cha
Article

Abstract

In recent studies, various types of multi-mode electric variable transmissions for hybrid electric vehicles have been proposed. A multi-mode electric variable transmission consists of two or more different types of a planetary gear hybrid powertrain system (PGHP), which can change power flow type using clutches to improve transmission efficiency. Input split systems are generally used for the single-mode powertrain because of their overall superiority, but other power split systems such as output split and compound split systems can be used in the dual-mode powertrain. In this study, we analyze the power transmission characteristics of output split systems, and evaluate their fuel economies in the FTP72 cycle, acceleration performance, and constant vehicle speeds. These results enable the selection of appropriate systems for a dual-mode powertrain.

Key Words

Transmission efficiency Hybrid electric vehicle Planetary gear Output split 

Nomenclature

α

ratio of lever length of MG1 to lever length of input from output

R

planetary gear ratio, ring/sun

RENG

reduction gear ratio of engine

RO

reduction gear ratio of output shaft

RMG1

reduction gear ratio of MG1

RMG2

reduction gear ratio of MG2

TENG

engine torque

TO

output shaft torque

TMG1

MG1 torque

TMG2

MG2 torque

ωENG

engine speed

ωO

output shaft speed

ωMG1

MG1 speed

ωMG2

MG2 speed

ηMG1

charging efficiency of motor 1

ηMG2

discharging efficiency of motor 2

PSR

power split ratio, power to the electric pass/total power

γ

speed ratio of input speed to output speed

γDTP

speed ratio of input speed to output speed when speed of MG1 or MG2 is zero

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References

  1. Benford, H. L. and Leising, M. B. (1981). The lever analogy a new tool in transmission analysis. SAE Paper No. 810102.Google Scholar
  2. Conlon, B. (2005). Comparative analysis of single and combined hybrid electrically variable transmission operating modes. SAE Paper No. 2005-01-1162.Google Scholar
  3. Fussner, D. and Singh, Y. (2002). Development of single stage input coupled split power transmission arrangements and their characteristics. SAE Paper No. 2002-01-0590.Google Scholar
  4. Jung, K. H., Kim, H. E. and Kim, J. K. (2005). Performance and transmission efficiency analysis of 2-mode hydro mechanical transmission. Trans. Korean Society of Automotive Engineers 13,1, 90–98.Google Scholar
  5. Yang, H., Cho, H., Kim, N., Lim, W. and Cha, S. (2007). Analysis of planetary gear hybrid powertrain system part 1: Input split system. Int. J. Automotive Technology 8,6, 771–780.Google Scholar

Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg GmbH 2009

Authors and Affiliations

  1. 1.Department of Mechanical and Aerospace EngineeringSeoul National UniversitySeoulKorea
  2. 2.School of Mechanical Design and Automation EngineeringSeoul National University of TechnologySeoulKorea

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