Abstract: Aiming at the driving torque distribution between front and rear motor of two-axle drive electric vehicles, an optimization model is established based on the motor’s MAP characteristics, in order to maximize the utilization efficiency of dual-motor, then an optimal torque distribution model of dual- motor is obtained under the demand of different speed and torque. For two-axle drive electric vehicles, three driving modes of normal, power and economy are designed. And based on this optimization model, three dual- motor’s torque distribution strategies of three driving modes are worked out. Finally, a united simulation model of Carsim/Simulink is built for a lightweight electric minibus. And 0-60km/h acceleration time is used to verify the dynamic performance, and the economic performance of NEDC is used to verify efficiency. The results of simulation show that, the strategy studied in this paper can not only shorten the acceleration time of electric minibus by a small margin, but also extend the range of NEDC, which has increased 2.2%, 4.56% and 6.6% respectively under three driving modes. It provides an optimization method of dual- motor’s torque distribution for two-axle drive electric vehicles.

Key words: electric vehicle, two-axle drive, driving torque distribution, driving mode