车辆与动力技术

滑模控制因其强鲁棒性而广泛应用于线控转向系统，但其存在的抖振问题一直未得到有效解决。因此，为改善普通滑模控制固有的抖振问题以及进一步提高线控转向系统在车辆转向时的操纵稳定性，文章提出了一种综合考虑横摆角速度和质心侧偏角的基于自适应超扭曲滑模控制的新型控制策略，同时设计了线控转向系统理想变传动比曲线。最后通过Simulink和Carsim仿真平台搭建线控转向系统仿真模型并在不同的工况和路面附着系数条件下进行联合仿真，对比分析机械转向、变传动比控制、滑模控制、自适应滑模控制与自适应超扭曲滑模控制的控制效果。仿真结果表明自适应超扭曲滑模控制的控制效果最好，既抑制了抖振，又显著提高了车辆的操纵稳定性。

Sliding mode control is widely used in steer-by-wire systems due to its strong robustness, but the accompanying chattering issue has not been effectively resolved. To mitigate the inherent chattering problem in conventional sliding mode control and further enhance the handling stability of vehicles during steering, this paper proposes a novel control strategy based on an adaptive super-twisting sliding mode control that takes into account both yaw rate and sideslip angle. An ideal variable transmission ratio curve for the steer-by-wire system is also designed. Finally, a simulation model of the steer-by-wire system was built using Simulink and Carsim. Co-simulations were conducted under various working conditions and road adhesion coefficients to compare the control effects of mechanical steering, variable transmission ratio control, sliding mode control, adaptive sliding mode control, and adaptive super-twisting sliding mode control. The simulation results demonstrate that adaptive super-twisting sliding mode control achieves the best performance, effectively suppressing chattering while significantly improving vehicle handling stability.