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International Journal of Automotive Technology > Volume 10(3); 2009 > Article
International Journal of Automotive Technology 2009;10(3): 381-390.
ANALYSIS OF PLANETARY GEAR HYBRID POWERTRAIN SYSTEM PART 2: OUTPUT SPLIT SYSTEM
H. YANG1, B. KIM2, Y. PARK3, W. LIM2, S. CHA2
1Seoul National Univ.
2Seoul National University
3Seoul National University of Technology
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{{br}}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
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