Journal
INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY
Volume 11, Issue 4, Pages 565-571Publisher
KOREAN SOC AUTOMOTIVE ENGINEERS
DOI: 10.1007/s12239-010-0068-3
Keywords
Hybrid electric vehicle; Lever analysis; Power split transmission; Dual mode
Funding
- Ministry of Knowledge Economy (MKE)
- Korea Institute for Advancement in Technology (KIAT)
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The power split type hybrid system transmits engine power by dividing it into the electrical unit and the mechanical unit. Its power transmission efficiency is highest at the mechanical point (MP), where the full power is transmitted to the mechanical unit. In this study, the equation for the MP was derived for the gear ratios of a general 4-node lever model. The MP characteristics for the transmission ratio (TR) of the input split and compound split structures were examined using the equation derived. Using the examined input split and compound split structures, a systematic design method for the dual mode power split transmission was proposed. In the dual mode power split transmission, the MP could be positioned at the desired TR, and the input split and compound split modes could be selectively used according to the clutch combination, which leads to the operation of the vehicle within a high system efficiency range.
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