Coordinated control of AFS and DYC using a novel disturbance observation sliding mode considering unknown lateral wind disturbances

Abstract

To guarantee the stability of the vehicle under uncertain lateral wind disturbances, a new AFS/DYC hierarchical coordinated control strategy is proposed in this paper based on the disturbance observation principle. In the proposed coordinated control strategy, due to the correlation between the existing real-time disturbance observer observations and stability control, a special sliding mode surface is designed from the principle of the disturbance observer. As a result, an adaptive disturbance observation sliding mode control (DOSMC) is proposed to reduce the effect of lateral wind disturbances and maintain the lateral stability of the vehicle. In order to reasonably allocate the AFS/DYC weights, the accurate interference values are obtained by an offline interference observer optimized by a particle swarm, so as to achieve the coordination of the additional lateral moments between AFS and DYC based on multiple judgments such as the interference suffered by the vehicle. To verify the designed control strategy, corresponding simulations were conducted. The results demonstrate that the proposed hierarchical coordinated control strategy can effectively reduce the influence of lateral wind disturbances and fully harness the advantages of the AFS/DYC control system.