EVS28 International Electric Vehicle Symposium and Exhibition 1 EVS28 KINTEX, Korea, May 3-6, 2015 Development of a Plug-In HEV Based on Novel Compound Power-Split Transmission Tong Zhang 1 , Chen Wang 1,2 , Zhiguo Zhao 2 , Wentai Zhou 1,2 1 Corun CHS Technology Co., Ltd., NO.2888 Wanfeng Road, Fenjing Industry Park, Jinshan District Shanghai 201501, China 2 Clean Energy Automotive Engineering Center, Tongji University, N0.4800 Caoan Road, Jiading District, Shanghai 201804, China, w_chen_ev@sina.com Abstract In order to extend the product applications into plug-in hybrid electric vehicle field, a high capacity lithium-ion battery is configured and matched to the previous compound power-split hybrid transmission which is based on a modified ravigneaux gear set with two additional brake clutches. The equivalent lever diagrams are used to investigate the operating modes for the hybrid system, and its dynamic and kinematic characteristics in equations are derived. To evaluate the economy and power performance of the plug-in hybrid vehicle, a forward-looking simulation platform and components model are established. In addition, the simulating results of key power and economy tests are demonstrated. Results show that the proposed powertrain configuration can be well used for plug-in applications, and the economy and power performance can be further improved. Keywords: PHEV, Hybrid Transmission, E-CVT, Ravigneaux Gear Set 1 Introduction The class of plug-in hybrid electric vehicle (PHEV), where the power battery with high capacity can be recharged from an external source, dramatically improved the vehicle economy and emission performance. Several powertrain configurations, including series, parallel, and power-split were selected with respect to component sizes and fuel economy for PHEV applications. It is complex to decide the optimal powertrain configuration for PHEV applications. But in the charging depletion mode, the power-split provided the best fuel economy as a result of its dual path of power from the engine to the wheel [1]. The GM volt hybrid powertrain [2] based on a output power-split device was originally designed for PHEV application. The TOYOTA prius plug-in hybrid powertrain [3] was developed based on the third generation toyota hybrid system (THS) with an input power-split device. In this paper, we develop a plug-in hybrid powertrain on the basis of previous strong hybrid powertrain equipped with a novel compound power-split device. A high capacity lithium-ion battery is substituted for the nickel-metal battery to extend the electric driving range. In addition, different operating modes are analysed using lever diagrams, and the control strategy which slightly modified to take well use of the grid power is presented. Furthermore, the power and economy simulation tests are applied to validate the effectiveness of concept design and control strategy. World Electric Vehicle Journal Vol. 7 - ISSN 2032-6653 - ©2015 WEVA Page WEVJ7- 0166