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Tracking Error Learning Control for Precise Mobile Robot Path Tracking in Outdoor Environment

  • Erkan Kayacan
  • Girish Chowdhary
Article
  • 24 Downloads

Abstract

This paper presents a Tracking-Error Learning Control (TELC) algorithm for precise mobile robot path tracking in off-road terrain. In traditional tracking error-based control approaches, feedback and feedforward controllers are designed based on the nominal model which cannot capture the uncertainties, disturbances and changing working conditions so that they cannot ensure precise path tracking performance in the outdoor environment. In TELC algorithm, the feedforward control actions are updated by using the tracking error dynamics and the plant-model mismatch problem is thus discarded. Therefore, the feedforward controller gradually eliminates the feedback controller from the control of the system once the mobile robot has been on-track. In addition to the proof of the stability, it is proven that the cost functions do not have local minima so that the coefficients in TELC algorithm guarantee that the global minimum is reached. The experimental results show that the TELC algorithm results in better path tracking performance than the traditional tracking error-based control method. The mobile robot controlled by TELC algorithm can track a target path precisely with less than 10 cm error in off-road terrain.

Keywords

Learning control Mobile robot Path tracking Tracking error 

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© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Senseable City Laboratory and Computer Science & Artificial Intelligence Laboratory Massachusetts Institute of TechnologyCambridgeUSA
  2. 2.Coordinated Science Laboratory and Distributed Autonomous Systems LaboratoryUniversity of Illinois at Urbana-ChampaignChampaignUSA

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