Infrastructure enhanced motion planning for automatic driving on unstructured roads: A case study of ETC stations
Article Text (Baidu Translation)
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摘要: 为提升基于优化控制的网联自动驾驶车辆运动规划方法的安全性、普适性、实用性,提出了一种路端强化的网联自动驾驶车辆运动规划方法;构建基于控制障碍函数的运动控制系统,保证非线性系统构造下的安全避障强约束,实现了车辆提前响应,避让超出可视范围的障碍物;提出以优化路径为参考线的坐标系,消除了对道路中心线的依赖,适配非结构化道路环境下的运动规划;提出了一种“路助车”式运动规划方法,打破了传统“路开车”式运动规划方法计算效率低、安全性低、实用性差的局限;以ETC收费站场景为典型案例,对所提出的运动规划方法进行了仿真测试。研究结果表明:在存在车道线瞬变、车道线消失、占道施工的典型非结构化道路场景上,所提出的方法表现优于传统车端运动规划模型,行车风险降低了11.34%,通行效率提高了17.36%,各模块平均单次响应运行时长均小于0.05 s。所提出的运动规划方法能有效降低超视距风险,提高通过非结构化道路效率,提升算法应用实时性,并能保证在不同车路通信条件下的鲁棒性。Abstract: To enhance the safety, generality, and practicality of the motion planning method for connected and automated vehicles based on optimal control, an infrastructure enhanced motion planning method was proposed for connected and automated vehicles. A motion control system based on a control barrier function was constructed to ensure strong constraints for safe collision avoidance under nonlinear system configuration, enabling vehicles to respond proactively and avoid over-the-horizon obstacles. A coordinate system with the optimized path as the reference line was proposed. It eliminated the dependence on road centerlines, and adapted to motion planning in unstructured road environments. An "infrastructure assisting vehicle" motion planning method was proposed, breaking the limitations of low computational efficiency, low safety, and poor practicality inherent in the traditional "infrastructure driving vehicle" motion planning method. Simulation testing was conducted on the proposed motion planning method, with electronic toll collection (ETC) stations taken as a typical case. The research results show that on typical unstructured road scenarios characterized by transient lane markings, missing lane markings, and lane-occupying construction, the proposed method is superior to traditional onboard motion planning models. The driving risk is reduced by 11.34%, and travel efficiency is increased by 17.36%. The average single-response runtime is less than 0.05 s for each module. The proposed motion planning method effectively reduces over-the-horizon risks, improves the efficiency of traversing unstructured roads, enhances real-time performance in algorithm application, and maintains robustness under varying vehicle-infrastructure communication conditions.
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