The current status of the new energy heavy truck electric drive system is that the overall configuration of the electric drive system with low-speed motors includes low-speed high-torque single/dual motor direct drive type and low-speed motor with AMT gearbox type.
In order to meet the power performance requirements of uphill acceleration and maximum speed at the same time, electric vehicles with fixed gear reducers need to be matched with high-torque, high-speed drive motors.
For electric vehicles with two-speed AMT, the method of increasing the transmission ratio of the first gear is used to meet the driving force requirements of uphill, acceleration, and complex road conditions, and the reduction of the transmission ratio of the second gear is used to meet the high speed of the motor at the highest speed. Speed requirements, and then reduce the maximum torque value and maximum speed value of the motor.
Under the premise that the relevant parameters of the overall vehicle performance remain unchanged, the use of two-speed AMT will greatly increase the probability of the motor working in the optimum efficiency zone, thereby greatly improving the economy and cruising range of the vehicle.