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Safety compliance for mobile drive units

  • US 9,927,797 B2
  • Filed: 08/29/2014
  • Issued: 03/27/2018
  • Est. Priority Date: 08/29/2014
  • Status: Active Grant
First Claim
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1. A system comprising:

  • one or more processors; and

    one or more non-transitory computer-readable storage media storing instructions executable by the one or more processors to perform acts comprising;

    determining one or more drive unit locations corresponding to one or more mobile drive units;

    receiving a query message from individual mobile drive units of the one or more mobile drive units, the query message requesting permission to perform a set of activities;

    transmitting an activity message to the one or more mobile drive units in response to the query message, the activity message instructing individual mobile drive units of the one or more mobile drive units to perform the set of activities within a physical area;

    determining, via a locator device associated with a human, that a first location of the human is within the physical area;

    determining that a first mobile drive unit of the one or more mobile drive units is within a first distance from the first location of the human;

    ceasing transmission of the activity message to the first mobile drive unit, thereby causing the first mobile drive unit to stop performing the set of activities; and

    at least partially in response to ceasing transmission of the activity message to the first mobile drive unit, causing the first mobile drive unit to perform a new action including at least one of a performance of at least a portion, but not all, of the set of activities by the first mobile drive unit, or relocation of the first mobile drive unit to a distance greater than the first distance from the first location of the human.

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