Improvements to mobile robots and their control system

G - Physics – 05 – D

Patent

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Details

G05D 1/02 (2006.01) A47L 5/30 (2006.01) A47L 9/00 (2006.01) A47L 9/28 (2006.01) B25J 9/16 (2006.01) B25J 19/00 (2006.01)

Patent

CA 2311561

The invention concerns a system for guiding and positioning relative to a fixed recharging station an autonomous mobile robot comprising a rechargeable battery. The system operates by means of at least one directional infrared beam emitted by the fixed station, the mobile robot being equipped with a directional system for detecting infrared emission connected to a microcomputer incorporated in said robot. The robot moves on working surface in an essentially random manner, the microcomputer comprising an algorithm for controlling the return to the fixed station by moving the robot towards the direction of said infrared beam. The microcomputer algorithm initiates the return towards the fixed recharging station after a minimum working time, independently of the state of the battery charge, and when the mobile robot detects an intensity greater than a certain threshold, said threshold decreasing with the increase of the working time interval and/or when the state of the battery charge is below a certain level. Several infrared beams operating in different directions can be emitted to cause the robot to return to the recharge station.

L'invention concerne un système de guidage et de positionnement par rapport à une station fixe de recharge pour robot mobile autonome comportant une batterie rechargeable. Le système fait intervenir au moins un faisceau infrarouge directionnel émis par le station fixe, le robot mobile étant muni d'un système de détection directionnel d'émission infra-rouge relié à un microordinateur incorporé dans ledit robot. Le robot se déplace sur une surface de travail de manière essentiellement aléatoire, le microodinateur comprenant un algorithme apte à commander le retour à la station fixe par déplacement du robot vers la direction d'émission dudit faisceau infrarouge. L'algorithme du microodinateur intitie le retour vers la station fixe de recharge après un temps de travail minimum, indépendamment de l'état de charge de la batterie, et lorsque le robot mobile détecte un rayonnement infra-rouge d'une intensité supérieure à un certain seuil, ledit seuil décroissant avec l'augmentation de la durée du temps de travail et/ou lorsque l'état de charge de la batterie se situe sous un certain niveau. Plusieurs faisceaux infrarouge de directionalités différentes peuvent être émis pour favoriser le retour du robot à sa station de recharge.

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