Design of four-wheel drive power transmission system for range-extended electric pickup

MAO Lixiang; ZHONG Bing; WU Zhihong

doi:10.19471/j.cnki.1673-6397.2025.04.012

Abstract：In order to ensure the performance of a certain range-extended electric pickup,the parameter design of the four-wheel drive power transmission system of the range-extended electric pickup is studied.Based on MATLAB software,a mathematical model of a dual-motor four-wheel drive architecture including front and rear drive motors,a two-speed transmission,a power battery,and a range extender is established.According to the basic parameters and driving performance requirements of the pickup,the optimal performance parameters of the front and rear drive motors are calculated using the sequential quadratic programming(SQP)algorithm.In order to improve vehicle economy,the gear ratio of the two-speed transmission of the front and rear drive motors,configuration of the power battery capacity,and the parameters of the range extender are designed.Based on the new European driving cycle(NEDC),the energy consumption of the pack under constant speed,acceleration,and other working conditions is simulated and analyzed,and the driving range of the vehicle is calculated to verify the rationality of the parameter design of the range-extended electric four-wheel drive power system.The results show that the designed front and rear drive motor performance parameters can make the total maximum power of the vehicle motor 220 kW,and the total maximum torque of the motor reaches 621 N·m,which fully meets the power performance index of the maximum vehicle speed of 165 km/h,the acceleration time from 0 to 100 km/h is 8 s,and the maximum climbing angle at a speed of 30 km/h is 50%.After using the optimized vehicle power system parameters,the driving range in the NEDC cycle working condition is 124.78 km which meets the design requirement that the driving range shall not be less than 120 km.