Mobile robot and method of controlling the same

{
  "publication_number": "US11675072B2",
  "country": "US",
  "kind": "B2",
  "title": "Mobile robot and method of controlling the same",
  "abstract": "Disclosed is an autonomous mobile robot including a main body, and a driving part positioned below the main body and configured to move the main body, wherein the driving part includes a rotation part that is rotatably provided and is configured to dispose a sensor module including one or more sensors outwards, a base positioned below the rotation part, and a driving wheel installed on the base, thereby embodying a sensing system with low cost and high efficiency.",
  "claims": [
    "1. A mobile robot comprising: a main body group including at least two main bodies having physically different structures to provide different services depending on usage environment and purpose; and a driving part configured to select one main body among the main body group according to a required service, to be physically coupled to the selected main body such that the driving part to be located under the selected main body, and to move the selected main body, wherein the driving part includes: a rotation part that is rotatably provided and is configured to dispose a sensor module that includes one or more sensors facing outwards from the rotation part, a base positioned below the rotation part, and a driving wheel coupled to the base.",
    "2. The mobile robot of claim 1, wherein the rotation part includes a plurality of rotation parts that are stacked in upward and downward directions and are independently rotatable.",
    "3. The mobile robot of claim 2, wherein the plurality of rotation parts are provided on different layers and include different types of sensors.",
    "4. The mobile robot of claim 3, wherein the rotation part fixes one sensor, which detects a predetermined object, to detect the detected object and rotates remaining sensors to orient the remaining sensors in different directions among the different types of sensors.",
    "5. The mobile robot of claim 1, wherein the rotation part includes a first sensor rotation part disposed at an upper side and a second sensor rotation part disposed at a lower side; wherein a first sensor module including at least one of a light detection and ranging (LiDAR) sensor or a depth sensor is disposed on the first sensor rotation part; and wherein a second sensor module including an ultrasonic sensor is disposed on the second sensor rotation part.",
    "6. The mobile robot of claim 5, wherein the first sensor rotation part is rotated to orient a sensing direction of the first sensor module towards a non-detection area; and wherein the second sensor rotation part is rotated to orient the ultrasonic sensor towards a forward side of a traveling direction.",
    "7. A method of controlling a mobile robot that includes a main body group including at least two main bodies having physically different structures to provide different services depending on usage environment and purpose, and a driving unit configured to select one main body among the main body group according to a required service, and to physically couple to the selected main body, the method comprising: selecting one main body among the main body group according to a required service; structurally coupling the driving unit having a plurality of sensor modules to the selected main body; acquiring sensing data through the plurality of sensor modules during traveling; determining whether one or more of the sensor modules need to rotate based on the acquired sensing data; determining a sensor module, from the plurality of sensor modules, as a rotation target when rotation is determined to be needed; and rotating a rotation part disposed on the determined sensor module as the rotation target.",
    "8. The method of claim 7, wherein the determining whether rotation is needed includes determining that rotation is needed when a non-detection area that is not previously detected is detected; and wherein the rotating the rotation part includes fixing a rotation part, on which a sensor module including an ultrasonic sensor is disposed, to a front side in a traveling direction and rotating a rotation part, on which a sensor module including a LiDAR sensor is disposed, to orient a sensing direction of the LiDAR sensor towards the non-detection area.",
    "9. The method of claim 7, wherein the determining whether rotation is needed includes determining that rotation is needed when some of the plurality of sensor modules detect a predetermined object and the others of plurality of the sensor modules do not detect the predetermined object; and wherein the rotating the rotation part includes fixing at least one of the sensor modules, which detects the predetermined object, to detect the detected object, and rotating the rotation part to orient the remaining sensor modules in a different direction.",
    "10. The method of claim 9, wherein the rotation part is operated to orient the remaining sensor modules towards a forward side of a traveling direction."
  ],
  "description_excerpt": "The present invention relates to an autonomous mobile robot and a method of controlling the same, and more particularly, to a mobile robot that embodies a sensing system with low cost and high efficiency to effectively travel, and a method of controlling the same.\n\nRobots have been developed for industrial use to manage some parts of factory automation. Recently, application fields of robots have been further expanded to develop medical robots, aerospace robots, etc. and to manufacture robots used in a general home for domestic use. Among such robots, an autonomous mobile robot is referred to as a mobile robot.\n\nA mobile robot includes a plurality of sensors for autonomous and free movement and avoiding an obstacle or the like during traveling and is capable of traveling while avoiding an obstacle.\n\nIn general, an infrared sensor or an ultrasonic sensor is used for obstacle detection of a mobile robot. The infrared sensor determines the presence of an obstacle and a distance therefrom through light intensity of reflected light that is reflected by the obstacle and returns back to the sensor or time take to receive the reflected light, and the ultrasonic sensor determines a distance from an obstacle using a time difference between a time point at which ultrasonic waves are emitted and a time point at which the ultrasonic waves are reflected by an obstacle and return back to the sensor when there are ultrasonic waves with a predetermined period, which are emitted and are reflected by an obstacle.",
  "cpc": [
    "G01S 15/86",
    "B25J 11/00",
    "B25J 19/02",
    "B25J 5/007",
    "B25J 9/0009",
    "B25J 9/161",
    "B25J 9/1674",
    "G01S 15/931",
    "G01S 17/931",
    "G01S 7/4817",
    "G05D 1/024",
    "G05D 1/0255"
  ],
  "ipc": [
    "G01S 15/86",
    "G01S 15/931",
    "G01S 17/931",
    "G01S 7/481"
  ],
  "assignees": [
    "LG Electronics Inc"
  ],
  "inventors": [
    "Wonhee Lee"
  ],
  "filing_date": "2019-05-31",
  "publication_date": "2023-06-13",
  "grant_date": "2023-06-13",
  "priority_date": "2019-05-31",
  "application_number": "US-201916490372-A",
  "family_id": "68070907",
  "cited_by_count": 0,
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    "JP2015518188A",
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    "US20180025498A1",
    "US20190248014A1"
  ]
}