Distributed drive electric vehicles (DDEV) utilize differential torque to generate direct yaw moment (DYM) to improve vehicle safety and controllability, making the DYM control an active safety research hotspot. However, the generation of DYM relies on additional longitudinal tire forces, which may exceed the feasible tire force region, leading to vehicle drift. In addition, the DYM and traction force are highly coupled and can come into conflict under extreme handling operations. Thus, a novel concept of maneuverable stability region is proposed to describe the feasible safety boundaries of DYM and traction force. According to the different maneuverable stability region, four modes of vehicle operation are defined. Subsequently, the multi-modes judgment criterion is formulated using linear matrix inequality (LMI) to determine the boundaries of each mode and identify the current vehicle mode. Finally, a multi-mode torque distribution strategy (MTDS) is developed to meet the control requirements of the different modes, taking into account both energy saving and mechanical fatigue of the motors. Simulation and experimental results demonstrate that the multi-mode torque distribution strategy outperforms both the distributed torque distribution strategy and the single-mode torque distribution strategy. This strategy effectively mitigates the trade-off between mobility and stability, while maintaining vehicle safety, controllability, and energy saving at extreme handling limits.
Multi-modes Torque Distribution Strategy Based on Maneuverable Stability Region for Distributed Drive Electric Vehicles
2024-06-02
3126496 byte
Conference paper
Electronic Resource
English
An optimal torque distribution control strategy for four-independent wheel drive electric vehicles
Taylor & Francis Verlag | 2015
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