Abstract: A power tool (100), such as a chainsaw, comprising means (230) for driving said power tool (100) and a controller (210). The power tool comprises a movement sensor (220) and the controller (210) is configured to receive a signal from said movement sensor (220), determine if said signal is a signal indicating a movement, determine a time wherein no signal indicating a movement is received, determine if said time exceeds a time period, and if so, disable said driving means (230).

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) 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, 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 charging coupling for connecting a robotic garden tool with a charging device may facilitate the charging of a battery of the robotic garden tool. The charging coupling may include a first charging contact and a second charging contact. The first charging contact may be a charging plate or a charging rod. The second charging contact may be provided with a row of resilient contact bars. The arrangement of the first charging contact and the second charging contact may be configured such that the resilient contact bars are pressed against the charging plate to provide multiple contact points.

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: A system may include sensor equipment, task performance equipment, and a yard maintenance manager. The sensor equipment may include one or more sensors disposed on a parcel of land. The task performance equipment may be configured to perform a task on the parcel. The task may be associated with generating a result that is enabled to be monitored via the sensor equipment. The yard maintenance manager may be configured to interface with the sensor equipment and the task performance equipment to compare measured conditions with desirable conditions to direct operation of the task performance equipment.

Abstract: A method for enhancing a coverage distribution of a robotic garden tool (100) operating within a predetermined working area (200), wherein the robotic garden tool (100) is provided with steering control means operable to change a movement direction of the robotic garden tool (100), and a positioning device (120). The method comprises the steps of providing (301) working area related data, defining (302) a temporary working area (500), based on the working area related data, which temporary working area (500) at least partly extends within the working area (200), estimating (303) a current position (600) of the robotic garden tool (100), evaluating (304) the estimated current position (600), selectively adapting (305) the temporary working area (500), in response to the step of evaluating (304) the estimated current position, selectively adapting (306) a movement direction of the robotic garden tool (100), in response to the step of evaluating (304) the estimated current position.

Abstract: A robotic lawnmower 1 is provided, having a deactivated state, a stand by state and an activated state. A removable disabling device 3 is arranged to be positioned in a first, a second, and a third position in a retainer 5 of the robotic lawnmower 1. The first position constitutes an off position in which the robotic lawnmower 1 is in a deactivated state. The second position constitutes a stand by position in which the robotic lawnmower 1 is in a stand by state. The third position constitutes an on position in which the robotic lawnmower 1 is in an activated state. The present invention also relates to a disabling device 3 arranged to be positioned in a retainer 5 of a robotic lawnmower 1 according to the invention.

Abstract: Disclosed is a robotic work tool (100) for use with at least one guiding wire (250; 260) adapted to conduct electric current to generate a magnetic field around the guiding wire. The robotic work tool has a sensing system (510) adapted to detect a strength of the magnetic field, a steering system (540), a controller (530) configured to control the steering system in response to output from the sensing system by means of a feedback control loop (532) so as to cause movement of the robotic work tool along the guiding wire. The controller is configured to determine a measure indicative of a distance between the robotic work tool and the guiding wire, and adjust at least one parameter of the feedback control loop in response to the determined distance measure.

Abstract: A robotic work tool system (200), comprising a charging station (210), a boundary wire (250), a signal generator (240) for generating and transmitting a signal through said boundary wire (250) for demarcating a work area (205) and for generating a magnetic field (265) for guiding a robotic work tool (100) to said charging station (210), said robotic work tool (100) being configured to detect a magnetic field strength of the magnetic field (265) in the work area (205), direct itself towards an increasing magnetic field strength, determine that the robotic work tool (100) is unable to reach the charging station (210), inform the robotic work tool system (200) accordingly, whereby the robotic work tool system (200) is configured to adapt a current level of the signal generating the magnetic field (365).

Abstract: A method for enhancing a coverage distribution of a robotic garden tool (100) operating within a predetermined working area (200), wherein the robotic garden tool (100) is provided with steering control means operable to change a movement direction of the robotic garden tool (100), and a positioning device (120). The method comprises the steps of providing (301) working area related data, defining (302) a temporary working area (500), based on the working area related data, which temporary working area (500) at least partly extends within the working area (200), estimating (303) a current position (600) of the robotic garden tool (100), evaluating (304) the estimated current position (600), selectively adapting (305) the temporary working area (500), in response to the step of evaluating (304) the estimated current position, selectively adapting (306) a movement direction of the robotic garden tool (100), in response to the step of evaluating (304) the estimated current position.

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: 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.

Abstract: A robotic lawnmower 1 is provided, having a deactivated state, a stand by state and an activated state. A removable disabling device 3 is arranged to be positioned in a first, a second, and a third position in a retainer 5 of the robotic lawnmower 1. The first position constitutes an off position in which the robotic lawnmower 1 is in a deactivated state. The second position constitutes a stand by position in which the robotic lawnmower 1 is in a stand by state. The third position constitutes an on position in which the robotic lawnmower 1 is in an activated state. The present invention also relates to a disabling device 3 arranged to be positioned in a retainer 5 of a robotic lawnmower 1 according to the invention.