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System for managing operation of an industrial vehicle in restricted areas

  • US 8,515,629 B2
  • Filed: 06/04/2012
  • Issued: 08/20/2013
  • Est. Priority Date: 04/18/2008
  • Status: Active Grant
First Claim
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1. A method for controlling an industrial vehicle within a building, said method comprising:

  • storing, in a memory device onboard the industrial vehicle, a definition of a first area in the building;

    transmitting a separate radio signal to the industrial vehicle from at least three transmitters within the building;

    for each radio signal, determining a propagation time from the transmitter to the industrial vehicle;

    from the propagation times of the radio signals, deriving one and only one location of the industrial vehicle;

    determining, from the location and the definition of a first area, when the industrial vehicle is within the first area; and

    altering motion of the industrial vehicle in response to the industrial vehicle being within the first area.

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