Study of Shifting without Driving Force Interrupt for Double Electric Motor HEV

For traditional gearbox, the engine power is cut off while shifting, which will interrupt the power of power-train, make velocity down, affect the acceleration of up gear and lower the vehicle dynamic. A double electric motor hybrid electric vehicle (HEV) that designed in a particular integrated power-train structure provides the necessary condition to deal with power interrupting while shifting. In this paper, theory and control method of shifting without driving force interrupt (SWDFI) are studied. The evaluation indicators for SWDFI are advanced and the model of double electric motor HEV is used to analyze the performance of the vehicle. Results show that question of shifting with driving force interrupt is solved, which improves the dynamic of HEV.