Modern Manufacturing Engineering ›› 2024, Vol. 530 ›› Issue (11): 80-86.doi: 10.16731/j.cnki.1671-3133.2024.11.011

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Path tracking control of port AGVs based on the preview LMPC

WANG Feng1, LI Xiaochuan1, BAI Guoxing2   

  1. 1 CNOOC Energy Logistics Co.,Ltd.,Tianjin 300452,China;
    2 School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China
  • Received:2024-01-08 Online:2024-11-18 Published:2024-11-29

Abstract: Path tracking control is a key technology of port Automated Guided Vehicle (AGV),and the existing path tracking control methods have problems such as difficulty in maintaining high accuracy on reference paths with large curvature mutations such as U-turns,and poor real-time performance. To this end,a path tracking control method for port AGVs based on preview LMPC is proposed based on Linear Model Predictive Control (LMPC) without preview,where the linear expansion point is changed to the preview point in front of the AGV. The path tracking control method for port AGVs based on preview LMPC is compared with Nonlinear Model Predictive Control (NMPC) and LMPC without preview through the joint simulation.The simulation results show that the accuracy of the preview LMPC is high,the displacement error is no more than 0.060 2 m,which is comparable to that of the NMPC and significantly better than that of the LMPC without preview,and the reduction of this index can reach 93.25 % under the same working condition. The real-time performance of the preview LMPC is also good,and the solution time in each control cycle is no more than 6.020 3 ms,which is comparable to the LMPC without preview and significantly better than the NMPC,and the reduction of this index can be up to 72.52 % under the same working condition.

Key words: port Automated Guided Vehicle (AGV), unmanned driving, path tracking, preview control, Linear Model Predictive Control (LMPC)

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