Abstract: The present invention relates to a method (400) and a system (100) for guiding a robotic garden tool to a predetermined position. The robotic garden tool includes a control unit (104) and a sensor unit (102) to detect guiding signals. The sensor unit (102) detects a first guiding signal (110) from a first signal source (106) and the robotic garden tool follows the first guiding signal (110) at a variable distance from the first signal source (106) towards the predetermined position. While within a predetermined distance (D) from the predetermined position, the sensor unit (102) detects a second guiding signal (112) from a second signal source (108). Within the predetermined distance (D), the robotic garden tool follows one of the first and the second guiding signals (110 or 112) towards the predetermined position at a pre-configured distance from the corresponding signal source.

Abstract: The present invention relates to a method (300) and a system (100) for navigating a robotic garden tool (202) based on one or more operating parameters for subareas (210-218) within the working area (204) and a current location of the robotic garden tool (202). The working area (204) is provided with a signal source (104) corresponding to which a sensor unit (106) is provided in the robotic garden tool (202) for detecting the one or more signals (102) from the signal source (104). The robotic garden tool (202) may include a low-accuracy positioning device (110) for providing co-ordinates of various subareas (210-218) and at any given instant, an approximate location of the robotic garden tool (202). The robotic garden tool (202) further includes a processor means (114) for comparing the coordinates of the subareas (210-218) and the approximate position of the robotic garden tool (202) to determine a current location of the robotic garden tool (202) in the working area (204).

Abstract: The present invention relates to a method 400 and a system 100 for controlling a robotic garden tool 202 around a working area 204 in a boundary wire aided system. The system includes the robotic garden tool 202 to perform an operation within the working area 204, which is at least partly defined by a boundary. The boundary separates the working area 204 from a non-working area. The robotic garden tool also includes detecting means for detecting the boundary. Further, the robotic garden tool 202 is adapted to receive a status signal 110 sent from a signal source and the robotic garden tool 202 is configured to stop the operation, when the status signal 110 provides a stopping signal.

Abstract: A method of charging a battery (50). The method comprises the step of supplying (101) an essentially constant charging current (C) of a predetermined first magnitude (C1) from a power source (10) to the battery (50), during a first constant current mode (CC1) of charging. Furthermore the method comprises the step of switching (102) to a second constant current mode (CC2) of charging when a battery voltage (Vb) reaches a predetermined threshold value (Vt1); and the step of supplying (103) an essentially constant charging current (C) of a predetermined second magnitude (C2) to the battery (B), during the second constant current mode (CC2) of charging. The second magnitude (C2) is lower than the first magnitude (C1).

Abstract: Method and system for guiding a robotic garden tool (100) is disclosed. The robotic garden tool (100) may include at least two sensing means (108, 110, and 202). The robotic garden tool (100) is equipped to follow along a guiding wire (402) on a lawn (400). While the robotic garden tool (100) moves along the guiding wire (402), the sensing means (108, 110, and 202) may detect a magnetic field strength generated from current carrying guiding wire (402). The method (500) and the system (300) is equipped to provide instructions to the robotic garden tool (100) to follow the guiding wire (402) based on the difference of magnetic field strength sensed by at least two sensing means (108, 110, and 202).

Abstract: The present invention relates to a method 400 and a system 100 for controlling a robotic garden tool 202 around a working area 204 in a boundary wire aided system. The system includes the robotic garden tool 202 to perform an operation within the working area 204, which is at least partly defined by a boundary. The boundary separates the working area 204 from a non-working area. The robotic garden tool also includes detecting means for detecting the boundary. Further, the robotic garden tool 202 is adapted to receive a status signal 110 sent from a signal source and the robotic garden tool 202 is configured to stop the operation, when the status signal 110 provides a stopping signal.

Abstract: The present invention relates to a method (400) and a system (100) for guiding a robotic garden tool to a predetermined position. The robotic garden tool includes a control unit (104) and a sensor unit (102) to detect guiding signals. The sensor unit (102) detects a first guiding signal (110) from a first signal source (106) and the robotic garden tool follows the first guiding signal (110) at a variable distance from the first signal source (106) towards the predetermined position. While within a predetermined distance (D) from the predetermined position, the sensor unit (102) detects a second guiding signal (112) from a second signal source (108). Within the predetermined distance (D), the robotic garden tool follows one of the first and the second guiding signals (110 or 112) towards the predetermined position at a pre-configured distance from the corresponding signal source.

Abstract: The present invention relates to a method (300) and a system (100) for guiding a robotic garden tool to a predetermined position. The robotic garden tool includes a control unit (104) and a sensor unit (102) to detect signals. The sensor unit (102) detects a first signal (110) from a first signal source (106) and the robotic garden tool follows the first signal (110) at a varying distance from the first signal source (106) that is less than or equal to a maximum distance to the first signal source, towards the predetermined position. Wherein, the varying distance is a function of the strength of the detected first signal (110). While detecting the first signal (110), the sensor unit may also detect a second signal (112) from a second signal source (108).

Abstract: The present invention relates to a method (300) and a system (100) for navigating a robotic garden tool (202) based on one or more operating parameters for subareas (210-218) within the working area (204) and a current location of the robotic garden tool (202). The working area (204) is provided with a signal source (104) corresponding to which a sensor unit (106) is provided in the robotic garden tool (202) for detecting the one or more signals (102) from the signal source (104). The robotic garden tool (202) may include a low-accuracy positioning device (110) for providing co-ordinates of various subareas (210-218) and at any given instant, an approximate location of the robotic garden tool (202). The robotic garden tool (202) further includes a processor means (114) for comparing the coordinates of the subareas (210-218) and the approximate position of the robotic garden tool (202) to determine a current location of the robotic garden tool (202) in the working area (204).