A systematic analysis methodology is proposed to design the suitable three-mode configurations based on the lever model. Based upon the torque and speed relationship among four powertrain elements, three suitable configurations are selected. In designing dual-mode powertrain, method of adding the number of PG and the DOF of configuration are applied based on the compound split mode. On the basis of dual-mode powertrain, three-mode powertrains are designed though adding input split in low speed ratio or compound split in high speed ratio. Comparing the relationship of motor’s speed and torque in dual-mode and three-mode powertrains separately, the structure which has low requirements for motors is selected.

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