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Hybrid electric vehicles are emerging as a practical solution for meeting increasingly more stringent governmental standards for fuel economy and emissions. In order to improve performance, increase efficiency, and reduce costs, there is a trend toward more integrated electro-mechanical transmission systems for advanced hybrid powertrains. This paper primarily focuses on the state-of-the-art electro-mechanical integration of hybrid transmission systems and presents a comprehensive review of various integrated powertrains including the power-split, two-mode hybrid transmission systems, and the electric variable transmission. Fundamental principles and mechanisms of operation for these integrated electro-mechanical transmission systems are presented as well.
Date of Conference: 6-9 Sept. 2011