China Mechanical Engineering ›› 2026, Vol. 37 ›› Issue (8): 1811-1823.DOI: 10.3969/j.issn.1004-132X.2026.08.001

   

Time-varying Guidance Vector Field-based Path Following Control for Hydraulic Excavators with Independent Metering

JIANG Hongda1,2, CHEN Junxiang1,2, AI Chao1,2(), KONG Xiangdong1,2   

  1. 1.State Key Laboratory of Crane Technology,Yanshan University,Qinhuangdao,Hebei,066004
    2.Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control,Yanshan University,Qinhuangdao,Hebei,066004
  • Received:2025-05-12 Online:2026-08-25 Published:2026-09-17
  • Contact: AI Chao

基于时变引导向量场的阀口独立液压挖掘机路径跟踪控制

姜宏达1,2, 陈俊翔1,2, 艾超1,2(), 孔祥东1,2   

  1. 1.燕山大学起重机械关键技术全国重点实验室, 秦皇岛, 066004
    2.燕山大学河北省重型机械流体动力传输与控制实验室, 秦皇岛, 066004
  • 通讯作者: 艾超
  • 作者简介:姜宏达,男,2000年生,博士研究生。研究方向为液压机械臂运动控制。发表论文4篇
  • 基金资助:
    国家自然科学基金(52475073);广西科技计划(桂科AB24010205);燕山大学标志性专项培育项目(2022BZZD001)

Abstract:

It is difficult for hydraulic excavators to achieve high-precision path tracking in complex dynamic environments, a hierarchical control architecture was proposed based on time-varying GVF. Firstly, the normalized time-varying guidance vector field was constructed as the upper planner, and the convergence term was designed based on the Euclidean distance function to drive the system to converge to the parameterized target path globally. Then a dynamic feedforward compensation term was introduced, and the null space projection mechanism was used to eliminate the influences of time-varying path geometric deformation on the tracking performance of the manipulator, so as to ensure the dynamic tracking ability to the target path. In addition, the ultimate boundedness of the system under model uncertainty and external disturbance was proved by Lyapunov stability theory, and the quantitative relationship between disturbance intensity and tip trajectory deviation was derived. Furthermore, a singularity avoidance mechanism was proposed to ensure the uniqueness and continuity of the global workspace solution of the vector field corresponding to the tip trajectory of the excavators. For the independent hydraulic system of the valve port, the lower controller designed a coordinated control strategy of oil inlet flow and oil return pressure to achieve high-precision tracking of the output commands of the planner and improve the energy efficiency of the systems. Finally, the effectiveness of the algorithm was verified by simulation.

Key words: guide vector field(GVF), time-varying path tracking, independent metering, flow/pressure control

摘要:

针对液压挖掘机在复杂动态环境中自主作业难以实现高精度路径跟踪的问题,提出一种基于时变引导向量场(GVF)的层级控制架构。构造归一化时变引导向量场作为上层规划器,基于欧氏距离函数设计收敛项以驱动系统全局渐近收敛至参数化目标路径,在此基础上引入动态前馈补偿项,结合零空间投影机制消除时变路径几何形变对机械臂跟踪性能的影响,确保其对目标路径的动态跟踪能力。此外,通过Lyapunov稳定性理论证明系统在模型不确定性与外部扰动下的最终有界性,并推导扰动强度与齿尖轨迹偏差间的定量关系,进一步地,提出奇异点规避机制以确保挖掘机齿尖运动轨迹对应的向量场在全局工作空间解的唯一性和连续性。针对阀口独立液压系统,下层控制器设计进油流量-回油压力协同控制策略,对上层规划器输出指令实现高精度跟踪的同时,提高了系统能效。最后通过仿真验证了所提算法的有效性。

关键词: 引导向量场, 时变路径跟踪, 阀口独立, 流量/压力控制

CLC Number: