Optimization of a dual-motor coupled powertrain energy management strategy for a battery electric bus

As the global environment and energy problems become increasingly serious, electric vehicles are expected to play an important role in current and future transportation. In this paper, the configuration of a coaxial series dual-motor coupled propulsion system is analysed, and the optimization objective function is obtained for a power management strategy in which the control strategy is extracted using Dynamic Programming (DP). The simulation model of the powertrain is tested in MATLAB with different strategies under standard driving cycles. The control strategies extracted from DP (DP-based strategy) reduces the energy consumption by 8.8% compared with the traditional proportional control strategy which simply distributes torques of the two electric motors according to default ratios.