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Robotic mower navigation system

  • US 9,072,219 B2
  • Filed: 06/20/2013
  • Issued: 07/07/2015
  • Est. Priority Date: 06/20/2013
  • Status: Active Grant
First Claim
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1. A robotic mower navigation system, comprising:

  • a robotic mower having a plurality of sensors that detect strength and polarity of a magnetic field from an electric current through a boundary wire; and

    an electronic control unit receiving data concerning the magnetic field from the plurality of sensors as the robotic mower follows the boundary wire, determining if the data shows an abrupt change in polarity and signal strength along the boundary wire indicating a specified geometric feature of the boundary wire, tracking the data for a sequence of the specified geometric features, comparing the data with a plurality of reference patterns that define location along the boundary wire, and providing a command to the robotic mower based on the comparison.

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