Mobile body system and control method

A mobile body system, comprising:

• at least four mobile bodies which move in a space, each of the at least four mobile bodies including:
• a storage in which map information of the space is stored, the space including a first area, a second area, and a boundary area in which the first area and the second area overlap;
• a distance measuring sensor;
• a mobile portion which moves the mobile body;
• and
• a controller which controls movement of the mobile body by the mobile portion, using the map information stored in the storage and a position of the mobile body estimated based on distance information obtained by the distance measuring sensor, wherein
• the at least four mobile bodies include a first mobile body, a second mobile body, a third mobile body, and a fourth mobile body,
• (i) upon movement of the at least four mobile bodies in the first area,
• each of the first mobile body, the second mobile body, and the third mobile body temporarily stops at a position within a first distance over which distance measurement by the distance measuring sensor is possible from an arbitrary position in the first area, and
• the fourth mobile body moves using a position of the fourth mobile body estimated based on a distance between the fourth mobile body and the first mobile body, a distance between the fourth mobile body and the second mobile body, and a distance between the fourth mobile body and the third mobile body which are measured by the distance measuring sensor that is included in the fourth mobile body, and
• (ii) upon movement of the at least four mobile bodies from the first area into the second area,
• (a) the fourth mobile body moves into the boundary area and temporarily stops using the distance between the fourth mobile body and the first mobile body, the distance between the fourth mobile body and the second mobile body, and the distance between the fourth mobile body and the third mobile body,
• (b) after the fourth mobile body moves into the boundary area, the first mobile body moves into the boundary area and temporarily stops using a distance between the first mobile body and the second mobile body, a distance between the first mobile body and the third mobile body, and the distance between the first mobile body and the fourth mobile body,
• (c) after the fourth mobile body moves into the boundary area, the second mobile body moves into the boundary area and temporarily stops using the distance between the second mobile body and the first mobile body, a distance between the second mobile body and the third mobile body, and the distance between the second mobile body and the fourth mobile body, and
• (d) after the fourth mobile body moves into the boundary area, the third mobile body moves into the boundary area and temporarily stops using the distance between the third mobile body and the first mobile body, the distance between the third mobile body and the second mobile body, and the distance between the third mobile body and the fourth mobile body.

A method for controlling a mobile body system including at least three mobile bodies which move in a space, each of the at least three mobile bodies including:

• a storage in which map information of the space is stored, the space including a first area, a second area, and a boundary area in which the first area and the second area overlap;
• a distance measuring sensor;
• a mobile portion which moves the mobile body;
• and
• a controller which controls movement of the mobile body by the mobile portion, using the map information stored in the storage and a position of the mobile body estimated based on distance information obtained by the distance measuring sensor, wherein
• the at least three mobile bodies include a first mobile body, a second mobile body, and a third mobile body, and
• the method comprises:
• (i) upon movement of the at least three mobile bodies in the first area,
• causing each of the first mobile body and the second mobile body to temporarily stop at a position within a first distance over which distance measurement by the distance measuring sensor is possible from an arbitrary position in the first area, and
• causing the third mobile body to move using a position of the third mobile body estimated based on a distance between the third mobile body and the first mobile body and a distance between the third mobile body and the second mobile body which are measured by the distance measuring sensor that is included in the third mobile body;
• and
• (ii) upon movement of the at least three mobile bodies from the first area into the second area,
• (a) causing the third mobile body to move into the boundary area and temporarily stop using the distance between the third mobile body and the first mobile body and the distance between the third mobile body and the second mobile body,
• (b) after the third mobile body moves into the boundary area, causing the first mobile body to move into the boundary area and temporarily stop using a distance between the first mobile body and the second mobile body and the distance between the first mobile body and the third mobile body, and
• (c) after the third mobile body moves into the boundary area, causing the second mobile body to move into the boundary area and temporarily stop using the distance between the second mobile body and the first mobile body and the distance between the second mobile body and the third mobile body.