关键词: 电动汽车；双电机；扭矩平衡；最大扭矩法；动态补偿；MATLAB/Simulink

Abstract: With the rapid development of new energy vehicles, dual-motor and multi-motor drive architectures have become mainstream technical solutions to improve power performance, handling stability and transmission efficiency of vehicles. The torque imbalance of dual motors on the same drive axle will directly lead to problems such as vehicle driving deviation, intensified transmission system shock, uneven tire wear and reduced driving safety. Aiming at the current situation that most dual-motor torque control adopts static average distribution method with insufficient dynamic synchronization performance, this paper takes the wheel-side/hub dual-motor drive system as the research object, establishes the mathematical model and dynamic equation of permanent magnet synchronous motor, and proposes a dynamic torque balance control strategy based on the maximum torque method. Without adding torque sensors, this strategy obtains motor acceleration through differential speed signals, indirectly estimates actual torque differences, performs dynamic compensation based on the maximum acceleration value, and quickly corrects dual-motor output deviations. A simulation model is built in MATLAB/Simulink to simulate the parameter differences caused by motor manufacturing discreteness, and the control effects of average torque method and maximum torque method are compared. The results show that the proposed strategy can suppress the torque deviation on a millisecond time scale, keep the dual-motor output highly synchronized, and its balance accuracy and response speed are significantly better than traditional methods. The research results can provide core algorithm support for torque cooperative management of dual-motor driven electric vehicles, and have important engineering application value for improving vehicle ride comfort, reliability and safety.

Key words: electric vehicles; dual motors; torque balance; maximum torque method; dynamic compensation; MATLAB/Simulink