Abstract:

The determining principles of the transmission ratio and the block number of electric vehicle are dis-cussed in this paper.It is discovered that the rated power/torque and the rotating speed of the motor must match the parameters of powertrain.With a type of electric vehicle as the research object,the charts describing the balance between the driving force and the obstruction force are presented and then analyzed by the calculations of the second
and the third gearshifts of a manual five-gear transmission.Based on the charts,a single gearshift driving scheme with the heavier mechanical gear transmission being replaced by the constant-ratio one is proposed.Theoretically,the gross mass is lightened and the driving range is increased by the proposed scheme.The gross mass and the driv-ing range of the electric vehicle are finally simulated using the dynamic simulation software of Advanced Vehicle Simulator(ADVISOR).The correctness of the proposed principles and methods for determining powertrain parame-ters is thus verified.

Key words: electric vehicle, powertrain, motor, matching, simulation