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

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.

This is a preview of subscription content, log in to check access.

Abbreviations

α :

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

R :

planetary gear ratio, ring/sun

R ENG :

reduction gear ratio of engine

R O :

reduction gear ratio of output shaft

R MG1 :

reduction gear ratio of MG1

R MG2 :

reduction gear ratio of MG2

T ENG :

engine torque

T O :

output shaft torque

T MG1 :

MG1 torque

T MG2 :

MG2 torque

ω ENG :

engine speed

ω O :

output shaft speed

ω MG1 :

MG1 speed

ω MG2 :

MG2 speed

η MG1 :

charging efficiency of motor 1

η MG2 :

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

γ DTP :

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

References

  1. Benford, H. L. and Leising, M. B. (1981). The lever analogy a new tool in transmission analysis. SAE Paper No. 810102.

  2. Conlon, B. (2005). Comparative analysis of single and combined hybrid electrically variable transmission operating modes. SAE Paper No. 2005-01-1162.

  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.

  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 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to H. Yang.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Yang, H., Kim, B., Park, Y. et al. Analysis of planetary gear hybrid powertrain system part 2: Output split system. Int.J Automot. Technol. 10, 381–390 (2009). https://doi.org/10.1007/s12239-009-0044-y

Download citation

Key Words

  • Transmission efficiency
  • Hybrid electric vehicle
  • Planetary gear
  • Output split