Abstract: To enhance the driving safety caused by cross-wind, the transient analysis model of a car overtaking truck on cross-sea bridge was established using a coupling method of composite wind and moving mesh, and the mechanism of aerodynamic interaction between “wind-vehicle-bridge” in the overtaking processes of a car and the influences on the aerodynamic characteristics of the car were revealed. The overtaking trajectory planning models were developed using a fifth degree polynomial interpolation algorithm, and the longitudinal and lateral coordination motion controllers were developed, using dual fuzzy PID control method for the longitudinal controllers and sliding mode control method of radial basis function network for the lateral controllers. The path tracking capability analysis and driving stability evaluation of the overtaking processes of a car under cross-wind were carried out. The results show that the aerodynamic interference is significantly related to the travelling lanes and positions. The longitudinal and lateral coordination motion controllers have better accuracy and robustness in controlling the path tracking, and the cross-wind stability is significantly improved.

Key words: overtaking, aerodynamic interference, cross-wind stability, path following, motion controller

摘要： 为提高跨海大桥上轿车的风致行车安全能力，采用合成风和动网格耦合方法建立了轿车超越集装箱货车的瞬态分析模型，揭示了“风车桥”气动交互作用机理及其对轿车气动特性的影响规律。采用五次多项式插值算法建立了超车轨迹规划模型，基于模糊逻辑的双PID控制方法与径向基神经网络的滑模控制方法设计了纵横向协调控制器，开展了轿车超车过程的路径跟踪能力分析及行驶稳定性评价。研究结果表明：风车桥的气动干扰大小与行驶车道及位置有显著关系，纵横向协调控制器的路径跟踪控制精度和鲁棒性较好，轿车侧风稳定性提高效果明显。

关键词: 超车, 气动干扰, 侧风稳定性, 路径跟踪, 运动控制器