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Autonomous Robots

, Volume 21, Issue 1, pp 79–97 | Cite as

High accuracy path tracking for vehicles in presence of sliding: Application to farm vehicle automatic guidance for agricultural tasks

  • Roland Lenain
  • Benoit Thuilot
  • Christophe Cariou
  • Philippe Martinet
Article

Abstract

When designing an accurate automated guidance system for vehicles, a major problem is sliding and pseudo-sliding effects. This is especially the case in agricultural applications, where five-centimetre accuracy with respect to the desired trajectory is required, although the vehicles are moving on slippery ground.

It has been established that RTK GPS was a very suitable sensor to achieve automated guidance with such high precision: several control laws have been designed for vehicles equipped with this sensor, and provide the expected guidance accuracy as long as the vehicles do not slide. In previous work, further control developments have been proposed to take sliding into account: guidance accuracy in slippery environments has been shown to be preserved, except transiently at the beginning/end of curves. In this paper, the design of this control law is first recalled and discussed. A Model Predictive Control method is then applied in order to preserve accuracy of guidance even during these curvature transitions. Finally, the overall control scheme is implemented, and improvements with respect to previous guidance laws are demonstrated through full-scale experiments.

Keywords

Non linear control Adaptive control Model Predictive Control of vehicles Vehicle motion in presence of sliding effects Automated guided vehicle Path tracking of mobile robot Agricultural robots and environmental applications 

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Copyright information

© Springer Science + Business Media, LLC 2006

Authors and Affiliations

  • Roland Lenain
    • 1
  • Benoit Thuilot
    • 2
  • Christophe Cariou
    • 1
  • Philippe Martinet
    • 2
  1. 1.CemagrefAubière CedexFrance
  2. 2.LASMEAAubière CedexFrance

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