关键词: 域控架构；双电机；扭矩分配；操纵稳定性

Abstract: This paper proposes a control strategy based on a domain control architecture for a dualmotor recirculating-ball steering system in commercial vehicles. The strategy achieves the calculation and distribution of steering assist torque, integrates multiple functional modules such as speed-sensitive assist and active return, and outputs corresponding torque reduction coefficients based on fault categories to ensure the smooth operation of the motors and vehicle under fault conditions. The entire strategy is integrated into a domain control unit (DCU) to assist the driver in maintaining handling stability and driving safety. The proposed control strategy is validated using a hardware-in-the-loop (HIL) experimental platform. The results show that under normal conditions, the torque reduction coefficient is 0, and the system accurately calculates and allocates 100% of the assist torque to the two steering motors. Under fault conditions, the system can implement four predefined levels of torque reduction based on the fault type, effectively balancing handling stability and driving safety.

Key words: domain control architecture; dual-motor; torque distribution; handling stability