Abstract: A robotic work tool system (200), comprising a robotic work tool (100), said robotic work tool (100) comprising a controller (110) being configured to cause said robotic work tool (100) to operate in a first operating mode, which first operating mode is based on a current position, said current position being determined based on signals received from a position determining device (190), such as Global Navigation Satellite System device (190); determine that said received signals are not reliable, and in response thereto cause said robotic work tool (100) to operate according to second operating mode, which second operating mode is not based on a current position being determined based on said received signals.

Abstract: A robotic work tool system (200) is provided. The system comprises a robotic work tool (100), and said robotic work tool (100) comprises a stationary hub (310) and a rotatable shaft (162) being supported by the hub (310). Also, a hub cover (340) is releasably attached to the hub (310). The robotic work tool (100) further comprises a skid plate (330) extending radially outwards from the hub cover (340), and wherein the skid plate (330) is arranged between the hub (310) and the hub cover (340).

Abstract: A robotic work tool system (200) comprising a charging station (210) and a robotic work tool (100), said robotic work tool (100) comprising a position determining device (190) for determining a current position, the robotic work tool (100) being configured to determine that reliable navigation through said position determining device (190) is no longer possible, such as when satellite signal reception is not possible, at a time point (T1) and position and in response thereto generate an obstacle map which gives information on the position of at least one obstacle (260), determine when an area will be shadowed with regards to satellite reception based on said obstacle map, and to schedule operation of the robotic work tool (100) accordingly.

Abstract: A robotic work tool system 200 comprising a robotic work tool 100, said robotic work tool 100 comprising a tool holder 160, e.g. in form of a disc, polygon, or comprising a plurality of arms, adapted to hold at least one tool 162 and adapted to be arranged in the robotic work tool 100, the tool holder 160 comprising at least one tool attachment means 164 and at least one spring attachment means 160a, 160b, 160c, wherein each tool attachment means 164 is positioned outside a respective spring attachment means 160a, 160b, 160c on a radius of the tool holder 160. The tool holder 160 is disc-shaped, polygon-shaped or comprises at least one rotating arm, and is equipped with two independent attachment means for each tool 162. By providing the tool holder with spring attachment means, plate springs could be attached to the tool holder as a further attachment means for the tools, which enables quick shifting of tools. To be published with FIG. 3.

Abstract: A robotic work tool system, comprising a charging station and a robotic work tool, said robotic work tool comprising two charging connectors arranged on an upper side of the robotic work tool and said charging station comprising two charging connectors and a supporting structure arranged to carry said charging connectors and to extend over and above said robotic work tool as the robotic work tool enters the charging station for establishing electrical contact between the charging connectors of the robotic work tool and the charging connectors of the charging station from above, wherein said supporting structure is arranged to allow the robotic work tool exit the charging station by driving through the charging station without reversing.

Abstract: A robotic vehicle may include a power module and a working module. The power module may include control circuitry configured to execute stored instructions to direct operation of the robotic vehicle on a defined area, and a drive motor for propelling the robotic vehicle responsive to control by the control circuitry. The working module may be configured to perform a function with respect to the defined area responsive to being propelled by the power module. The working module may be one of a plurality of interchangeable working modules that are attachable to the power module. At least one of the interchangeable working modules may have a different function than the working module.

Abstract: A robotic vehicle may include control circuitry, a device interface and a detachable user interface. The control circuitry may be configured to execute stored instructions to direct operation of the robotic vehicle on a defined area. The device interface may enable electronic communication of a device with the control circuitry. The detachable user interface may be configured to be removably mated with the robotic vehicle to enable communication between the detachable user interface and the control circuitry via the device interface. The detachable user interface may provide user interface capability to enable an operator to define one or more setting parameters or instructions responsive to the detachable user interface being mated with the robotic vehicle for execution by the control circuitry to control operation of the robotic vehicle when the detachable user interface is not mated with the robotic vehicle.

Abstract: A robotic work tool system (200), comprising a robotic work tool (100), said robotic work tool (100) comprising a controller (110) being configured to cause said robotic work tool (100) to operate in a first operating mode, which first operating mode is based on a current position, said current position being determined based on signals received from a position determining device (190), such as Global Navigation Satellite System device (190); determine that said received signals are not reliable, and in response thereto cause said robotic work tool (100) to operate according to second operating mode, which second operating mode is not based on a current position being determined based on said received signals.

Abstract: A robotic vehicle may include a power module and a working module. The power module may include control circuitry configured to execute stored instructions to direct operation of the robotic vehicle on a defined area, and a drive motor for propelling the robotic vehicle responsive to control by the control circuitry. The working module may be configured to perform a function with respect to the defined area responsive to being propelled by the power module. The working module may be one of a plurality of interchangeable working modules that are attachable to the power module. At least one of the interchangeable working modules may have a different function than the working module.

Abstract: A robotic vehicle may include control circuitry configured to execute stored instructions to direct operation of the robotic vehicle on a defined area, and an electrical resistance sensor in communication with the control circuitry. The electrical resistance sensor may be configured to detect motion indicative of a lift event and a collision event using a single sensor.

Abstract: A robotic vehicle may include control circuitry, a device interface and a detachable user interface. The control circuitry may be configured to execute stored instructions to direct operation of the robotic vehicle on a defined area. The device interface may enable electronic communication of a device with the control circuitry. The detachable user interface may be configured to be removably mated with the robotic vehicle to enable communication between the detachable user interface and the control circuitry via the device interface. The detachable user interface may provide user interface capability to enable an operator to define one or more setting parameters or instructions responsive to the detachable user interface being mated with the robotic vehicle for execution by the control circuitry to control operation of the robotic vehicle when the detachable user interface is not mated with the robotic vehicle.