Navigational control system for a robotic device

  • US 8,515,578 B2
  • Filed: 12/13/2010
  • Issued: 08/20/2013
  • Est. Priority Date: 09/13/2002
  • Status: Active Grant
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First Claim
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1. A robotic cleaner, comprising:

  • a chassis and an outer shell secured to the chassis;

    left and right main drive wheel assemblies and respective independent electric motors, independently mounted in pivotally-biased combination with the chassis for pivotal motion with respect thereto at opposed ends of the transverse diameter of the chassis, and movable between a retracted position under the weight of the robotic cleaner during operation and an extended position wherein their axes of rotation are below the bottom plane of the chassis;

    a navigational control system operative to monitor movement activity of the robotic cleaner within a defined working area, the monitored movement activity including at least one of a position history of the robotic cleaner and an instantaneous position of the robotic cleaner; and

    a transmitting subsystem including a mechanical sweeping transmitter laser, wherein the mechanical sweeping transmitter laser;

    is configured to sweep to redirect a transmitting element of the mechanical sweeping transmitter laser;

    is configured to transmit in the infrared range from about 750 nm to about 1.4 ×

    10^4 nm;

    is configured to cover the defined working area by transmitting a beam substantially parallel to a surface of the defined working area;

    is mounted in combination with the outer shell secured to the chassis to define an overall structural envelope of a height to enable movement of the robotic cleaner under furniture; and

    is integrated in combination with a high point of a housing infrastructure of the robotic cleaner so that none of the structural features of the robotic cleaner interfere with sweeping of the transmitting element of the mechanical sweeping transmitter laser.

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