• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2025, Vol. 61 ›› Issue (10): 335-348.doi: 10.3901/JME.2025.10.335

• 运载工程 • 上一篇    

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基于层次迭代搜索的自动驾驶重载半挂牵引车轨迹规划方法

贺宜1,2,3, 杜宇豪1,2,3, 吴钪4, 邱志军1,2,3   

  1. 1. 武汉理工大学智能交通系统研究中心 武汉 430063;
    2. 交通信息与安全教育部工程研究中心 武汉 430063;
    3. 车路一体智能交通全国重点实验室 北京 100088;
    4. 山河智能装备股份有限公司 长沙 410100
  • 收稿日期:2024-05-22 修回日期:2024-12-02 发布日期:2025-07-12
  • 作者简介:贺宜,男,1986年出生,博士,研究员,博士研究生导师。主要研究方向为车辆动力学建模与控制、智能驾驶与自动驾驶。E-mail:heyi@whut.edu.cn;杜宇豪(通信作者),男,1999年出生。主要研究方向为车辆运动规划。E-mail:yuhao_du@whut.edu.cn
  • 基金资助:
    车路一体智能交通全国重点实验室开放基金课题(2024-A003)和国家自然科学基金(52322217)资助项目。

Hierarchical Iterative Search-based Trajectory Planning Method for Self-driving Heavy-duty Semi-trailer Tractors

He Yi1,2,3, DU Yuhao1,2,3, Wu Kang4, Qiu Zhijun1,2,3   

  1. 1. Intelligent Transportation Systems Research Center, Wuhan University of Technology, Wuhan 430063;
    2. Engineering Research Center for Traffic Information and Safety, Ministry of Education, Wuhan 430063;
    3. National Key Laboratory of Vehicle Road Integrated Intelligent Transportation, Beijing 100088;
    4. Sunward Intelligent Equipment Co., Ltd., Changsha 410100
  • Received:2024-05-22 Revised:2024-12-02 Published:2025-07-12

摘要: 针对半挂牵引车运动学模型与安全约束的高度非线性导致动态轨迹求解效率缓慢的问题,提出一种层次迭代搜索轨迹规划方法。首先,基于Frenet坐标系将半挂牵引车的横纵向运动解耦,设计基于半挂牵引车运动学的多项式轨迹采样求解方法,分别获取牵引车和拖挂车的运动轨迹。其次,为简化搜索过程,提升轨迹求解速度,构建先验损失估计模型并利用层次迭代搜索框架获得最优候选轨迹集合。最后,通过曲率、加速度和多圆包络碰撞检查选择最优可行运动轨迹。仿真表明,所提算法能够生成平滑且无碰撞的半挂牵引车运动轨迹,在复杂工况下完成避障任务,相比两种现有算法,求解效率分别提升85%和58%,能更好地平衡轨迹质量和求解效率之间的关系,满足实时避障路径求解的需要。

关键词: 汽车工程, 半挂牵引车, 层次迭代搜索, 轨迹规划, 自动驾驶

Abstract: A hierarchical iterative search trajectory planning method is proposed to address the slow efficiency of dynamic trajectory solving caused by the highly nonlinear kinematic model and safety constraints of semi-trailer tractors. Firstly, based on the Frenet coordinate system, the lateral and longitudinal motion of the semi-trailer tractor is decoupled, and a polynomial trajectory sampling solution method based on the kinematics of the semi-trailer tractor is designed to obtain the motion trajectories of the tractor and trailer separately. Secondly, to simplify the search process and improve trajectory solving speed, a prior loss estimation model is constructed and a hierarchical iterative search framework is used to obtain the optimal candidate trajectory. Finally, the optimal feasible motion trajectory is selected through curvature, acceleration, and multi circle envelope collision checks. Simulation results show that the proposed algorithm can generate smooth and collision free motion trajectories for semi-trailer tractors, and complete obstacle avoidance tasks under complex working conditions. Compared with the two existing algorithms, the solving efficiency is improved by 85% and 58% respectively, which can better balance the relationship between trajectory quality and solving efficiency and meet the needs of real-time obstacle avoidance path solving.

Key words: automotive engineering, semi trailer tractor, hierarchical iterative search, trajectory planning, autonomous driving

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