Patents by Inventor Marcus Liljedahl

Marcus Liljedahl has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20230185309
    Abstract: A robotic work tool system (200) comprising a robotic work tool (100) comprising a controller (110), the controller (110) being configured to determine an area locality (310) associated with a hindrance; determine a classifier (C) associated with the area locality (310); and determine an action for the robotic work tool (100), wherein the action is based on the classifier (C).
    Type: Application
    Filed: March 24, 2021
    Publication date: June 15, 2023
    Inventors: Tommy Glimberg, Stefan Grufman, Fredrik Kallström, Mattias Kamfors, Marcus Liljedahl, Björn Mannefred, Beppe Hellsin
  • Patent number: 11571980
    Abstract: A robotic lawnmower system comprising a charging station (210) and a robotic work tool (100), the charging station comprising a signal generator (240) to which a boundary cable (250) is to be connected, the signal generator (240) being configured to transmit a signal (245) through the boundary cable (250), and the robotic working tool (100) comprising a sensor (170) configured to pick up magnetic fields generated by the signal (245) in the boundary cable (250) thereby receiving the signal (245) being transmitted and a controller (110) configured to analyse the picked up signal, wherein the signal generator (240) is further configured to: prefilter the signal through an filter model; and transmit the prefiltered signal to through the boundary cable (250) by means of a current generator.
    Type: Grant
    Filed: March 21, 2018
    Date of Patent: February 7, 2023
    Assignee: HUSQVARNA AB
    Inventor: Marcus Liljedahl
  • Publication number: 20230034100
    Abstract: A robotic work tool system (200) comprising a robotic work tool (100), the robotic work tool (100) being configured to determine (410) that the robotic work tool (100) has entered a state of limited movement; determine (420) an exit path; and exit (430) the state of limited movement by navigating the exit path.
    Type: Application
    Filed: December 2, 2020
    Publication date: February 2, 2023
    Inventors: Jonas Holgersson, Stefan Bergström, Hugo Johansson, Erik Starhagen, Claes Johannesson, Marcus Stjärnås, Fredrik Klackensjö, Tommy Glimberg, Stefan Grufman, Mattias Kamfors, Marcus Liljedahl, Björn Mannefred, Beppe Hellsin
  • Publication number: 20230010420
    Abstract: A method for operating a robotic work tool (1) comprising a sensor for detecting a boundary wire (3) demarcating a work area (2). The method comprises the steps of detecting (9) at least a partial crossing of the boundary wire (3), allowing (12) a crossing of the boundary wire (3) by an offset, switching (8) between a first offset setting and at least a second offset setting of the work tool (1) based on one or more events (7). A robotic work tool (1) comprises a controller for controlling the operation of the robotic working tool (1). The controller is configured to: control the work tool (1) to operate within the work area (2), determine whether the work tool (1) crosses the boundary wire (3), allow a crossing of the wire (3) by the offset, and switch (8) between at least two offset settings stored in the work tool (1).
    Type: Application
    Filed: October 15, 2020
    Publication date: January 12, 2023
    Inventors: Tommy Glimberg, Stefan Grufman, Fredrik Kallström, Mattias Kamfors, Marcus Liljedahl, Björn Mannefred, Beppe Hellsin
  • Publication number: 20220342425
    Abstract: A robotic work tool system (200) for avoiding trails from a robotic work tool (100) in a transit zone (300) in which the robotic work tool (100) is allowed to travel from a start point (320) to a goal point (330) along a travel path (310). The system (200) comprises at least one memory (120,220) configured to store information about the transit zone (300), at least one robotic work tool (100) configured to travel along the travel path (310) and at least one controller (110,210) for controlling operation of the robotic work tool (100). The controller (110,210) is configured to receive, from the memory (120,220), information about the transit zone (300) and generate, based on the transit zone (300), the travel path (310) for the robotic work tool (100) from the start point (320) to the goal point (330). The generated travel path (310) is configured to differ from previously generated travel paths.
    Type: Application
    Filed: September 14, 2020
    Publication date: October 27, 2022
    Inventors: Tommy Glimberg, Stefan Grufman, Fredrik Kallström, Mattias Kamfors, Marcus Liljedahl, Björn Mannefred, Beppe Hesssin
  • Publication number: 20220295696
    Abstract: A robotic work tool system comprising at least one robotic work tool arranged to operate in a work area, the robotic work tool comprising at least one sensor and a communication interface, the robotic work tool being configured to establish a connection to a cloud service through said communication interface; receive data gathered by the at least one sensor and transmit the gathered data to the cloud service causing the cloud service to analyze the gathered data; receive operating data from the cloud service; and to operate at least one robotic work tool based on the operating data received from the cloud service.
    Type: Application
    Filed: August 17, 2020
    Publication date: September 22, 2022
    Inventors: Jonas Holgersson, Marcus Liljedahl, Jonas Rangsjö, Andreas Peterson, Patrik Jägenstedt, Mattias Kamfors
  • Patent number: 11310957
    Abstract: A robotic lawnmower system comprising a robotic lawnmower (100) and a signal generator (240) to which a cable (250, 260) is to be connected, the signal generator (240) being configured to transmit a signal (245) through the cable (250, 260). The robotic lawnmower (100) comprises: a sensor (170) configured to pick up magnetic fields generated by the signal (245) in the cable (250, 260) thereby receiving the signal (245) being transmitted and a controller (110). The controller (110) is configured to follow the cable (250, 260) at a distance by determining a received signal quality level and adapting the distance at which the robotic lawnmower (100) is following the cable at according to the determined signal quality level.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: April 26, 2022
    Assignee: Husqvarna AB
    Inventor: Marcus Liljedahl
  • Patent number: 11154006
    Abstract: A robotic lawnmower system comprising a signal generator (240), a boundary cable, at least one guide cable (260) and a robotic lawnmower (100), said signal generator being configured to transmit a control signal through said boundary cable and a guide signal through said at least one guide cable, and wherein said robotic lawnmower comprises a controller (110) and at least one sensor (170), wherein the controller is configured for receiving said control signal through said at least one sensor (170?) and determining a signal level for the control signal; and if the signal level for the control signal is below a threshold value, the controller (110) is configured to receive said guide signal and to synchronize on said guide signal.
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: October 26, 2021
    Assignee: HUSQVARNA AB
    Inventor: Marcus Liljedahl
  • Patent number: 10939611
    Abstract: A robotic lawnmower system, comprising a charging station comprising a controller said controller being configured to associate a time slot for use to transmit a guide signal, and a robotic lawnmower, wherein said controller is configured to detect if a guide cable is connected to the charging station or not, and if not, allot said associated time slot to another use.
    Type: Grant
    Filed: April 11, 2018
    Date of Patent: March 9, 2021
    Assignee: HUSQVARNA AB
    Inventor: Marcus Liljedahl
  • Patent number: 10721860
    Abstract: A robotic lawnmower system, comprising a robotic lawnmower and a charging station, said charging station comprising a signal generator being configured to transmit a boundary signal (A) utilizing CDMA coding having a frame length corresponding to a full frame length through a boundary wire, wherein said signal generator is configured to transmit said boundary signal in subframes, and wherein said robotic lawnmower is configured to receive said boundary signal by detecting magnetic fields generated by the boundary signal, and wherein the robotic lawnmower is configured to determine a set of conditions; and to determine if said set of conditions correspond to a first set of conditions, and if so listen to the subframes, and to determine if said set of conditions correspond to a second set of conditions, and if so listen to the full frames.
    Type: Grant
    Filed: March 21, 2018
    Date of Patent: July 28, 2020
    Assignee: HUSQVARNA AB
    Inventor: Marcus Liljedahl
  • Publication number: 20200198488
    Abstract: A robotic lawnmower system comprising a charging station (210) and a robotic work tool (100), the charging station comprising a signal generator (240) to which a boundary cable (250) is to be connected, the signal generator (240) being configured to transmit a signal (245) through the boundary cable (250), and the robotic working tool (100) comprising a sensor (170) configured to pick up magnetic fields generated by the signal (245) in the boundary cable (250) thereby receiving the signal (245) being transmitted and a controller (110) configured to analyse the picked up signal, wherein the signal generator (240) is further configured to: prefilter the signal through an filter model; and transmit the prefiltered signal to through the boundary cable (250) by means of a current generator.
    Type: Application
    Filed: March 21, 2018
    Publication date: June 25, 2020
    Inventor: Marcus Liljedahl
  • Publication number: 20200137952
    Abstract: A robotic lawnmower system comprising a signal generator (240), a boundary cable, at least one guide cable (260) and a robotic lawnmower (100), said signal generator being configured to transmit a control signal through said boundary cable and a guide signal through said at least one guide cable, and wherein said robotic lawnmower comprises a controller (110) and at least one sensor (170), wherein the controller is configured for receiving said control signal through said at least one sensor (170?) and determining a signal level for the control signal; and if the signal level for the control signal is below a threshold value, the controller (110) is configured to receive said guide signal and to synchronize on said guide signal.
    Type: Application
    Filed: March 20, 2018
    Publication date: May 7, 2020
    Inventor: Marcus Liljedahl
  • Publication number: 20200137951
    Abstract: A robotic lawnmower system, comprising a robotic lawnmower and a charging station, said charging station comprising a signal generator being configured to transmit a boundary signal (A) utilizing CDMA coding having a frame length corresponding to a full frame length through a boundary wire, wherein said signal generator is configured to transmit said boundary signal in subframes, and wherein said robotic lawnmower is configured to receive said boundary signal by detecting magnetic fields generated by the boundary signal, and wherein the robotic lawnmower is configured to determine a set of conditions; and to determine if said set of conditions correspond to a first set of conditions, and if so listen to the subframes, and to determine if said set of conditions correspond to a second set of conditions, and if so listen to the full frames.
    Type: Application
    Filed: March 21, 2018
    Publication date: May 7, 2020
    Inventor: Marcus Liljedahl
  • Publication number: 20200093057
    Abstract: A robotic lawnmower system, comprising a charging station comprising a controller said controller being configured to associate a time slot for use to transmit a guide signal, and a robotic lawnmower, wherein said controller is configured to detect if a guide cable is connected to the charging station or not, and if not, allot said associated time slot to another use.
    Type: Application
    Filed: April 11, 2018
    Publication date: March 26, 2020
    Inventor: Marcus Liljedahl
  • Publication number: 20190380266
    Abstract: A robotic lawnmower system comprising a robotic lawnmower (100) and a signal generator (240) to which a cable (250, 260) is to be connected, the signal generator (240) being configured to transmit a signal (245) through the cable (250, 260). The robotic lawnmower (100) comprises: a sensor (170) configured to pick up magnetic fields generated by the signal (245) in the cable (250, 260) thereby receiving the signal (245) being transmitted and a controller (110). The controller (110) is configured to follow the cable (250, 260) at a distance by determining a received signal quality level and adapting the distance at which the robotic lawnmower (100) is following the cable at according to the determined signal quality level.
    Type: Application
    Filed: January 24, 2018
    Publication date: December 19, 2019
    Inventor: Marcus Liljedahl