A robotic work tool system (200) for defining a stay-out area (120) within a work area (150). The stay-out area (120) is an area which is to be excluded from the work area (150) in which a robotic work tool (100) is subsequently intended to operate. The robotic work tool system (200) comprises a boundary definition unit (130) comprising at least one position unit (175) configured to receive position data and at least one controller (110, 210). The controller (110,210) is configured to receive a stay-out area definition trigger signal, which indicates that the boundary definition unit (130) has approached the stay-out area to be defined. The controller (110,210) is further configured to receive, based on the received signal, position data indicating the present position of the boundary definition unit (130) from the position unit (175). The controller (110,210) is further configured to define the stay-out area (120) as an area centered at an offset from the received position data.

A robotic mower and a path planning method, system and device are provided and the method includes controlling the robotic mower to exit a charging station, controlling the robotic mower to find a boundary wire or guide wire, where the boundary wire is pre-laid on the edge of the working area of the robotic mower, and the guidance line is pre-laid in the working area of the robotic mower, controlling the robotic mower to follow the boundary wire or guide wire to move until it reaches the predetermined position. With the disclosure, tracks generated when the robotic mower exit the charging station along a fixed path can be avoided, and the damage to the lawn or vegetation can be reduced.

A mulch gate control lever includes a handle that moves a mulch gate on a vertical pivot axis between a first mulching position and a second side discharge position. A torsion spring biases the handle to move into a first position slot at a first end of a slotted bracket to retain the mulch gate at the first mulching position, and into a second position slot at a second end of the slotted bracket to retain the mulch gate at the second side discharge position.

A steering system for a mower can include a wheel-specific driving unit for each wheel and a controller for providing control signals to each wheel-specific driving unit to thereby cause each wheel to be independently rotated at a different speed during a turn. By independently rotating each wheel, the mower can complete a turn without damaging the grass. The controller may also provide control signals to cause each steerable wheel to be positioned in a different wheel direction during the turn.

An automatic lawn compactor includes a case, a battery pack, a controller, a driving device and a trampling device. The battery pack is disposed in the case. The battery pack is configured to supply electrical power to the driving device. The controller is connected with the driving device for controlling the driving device. The driving device is configured to drive the automatic lawn compactor to move autonomously on the lawn. The grass on the lawn is trampled by the trampling device as the automatic lawn compactor moves on the lawn. Through regular trampling the lawn, the grass on the lawn is kept at a certain height to realize the beauty and ornamentality of the lawn. The automatic lawn compactor overcomes the shortcomings of large noise, the difficulty of cleaning up the grass, and the hard work by the existing lawn compactors.

A grass cutting mobile robot includes a body and a blade assembly connected to the body and rotatable about a drive axis. The blade assembly includes blades, a housing to hold the blades, a coupling latch configured to lock the housing to a drive shaft of the mobile robot, and a spring that connects the blade to the coupling latch. The housing is configured for coupling to an actuator so that the housing is rotatable about a drive axis, and receives a shaft that connects the housing to the actuator. The shaft includes a groove or an undercut therein. The coupling latch is rotatable within the housing to move an engagement end towards, or away from the groove or undercut. The engagement end is positionable within the groove to lock the housing to the actuator.

An electric work vehicle includes a traveling motor to drive wheels, a working motor to drive a work machine, a manipulator to direct a target rotation speed of the traveling motor and operation of the work machine, a controller to control the traveling motor and the working motor according to operation of the manipulator, and a temperature sensor to detect temperature of the working motor. The controller maintains or changes a target torque range of the working motor according to a detected temperature of the working motor, and the controller maintains or changes a target rotation speed of the traveling motor so that a calculated output torque value of the working motor falls within the target torque range.

A mobile robot includes a body movable over a surface within an environment, a calibration coil carried on the body and configured to produce a calibration magnetic field, a sensor circuit carried on the body and responsive to the calibration magnetic field, and a controller carried on the body and in communication with the sensor circuit. The sensor circuit is configured to generate calibration signals based on the calibration magnetic field. The controller is configured to calibrate the sensor circuit as a function of the calibration signals, thereby resulting in a calibrated sensor circuit configured to detect a transmitter magnetic field within the environment and to generate detection signals based on the transmitter magnetic field. The controller is configured to estimate a pose of the mobile robot as a function of the detection signals.

A robotic mower and method for controlling a robotic mower to a predetermined position, by means of a guide wire. The robotic mower includes a control unit and at least one sensor. At least one of the sensors detects a signal from the guide wire and follows the guide wire at a first distance that is randomly determined. The robotic mower follows the guide wire until detecting, by means of the at least one sensor, a signal from a boundary wire and then following the boundary wire at a second distance, which is randomly determined. When detecting that the signal strength from the guide wire falls outside a first predetermined threshold, the robotic mower starts following the guide wire again.

A convertible lawnmower includes a housing and a mulching system. The housing includes a discharge opening. The mulching system includes a mounting ring and a shutter ring. The mounting ring is coupled substantially concentrically to the housing and includes an upper surface, a lower surface, and a sidewall that extends substantially axially therebetween. The sidewall is formed with a retaining groove and at least one installation groove. The retaining groove extends at least partially circumferentially within an inner surface of the sidewall and each installation groove extends axially from the lower surface to the retaining groove. The shutter ring is only coupled to mounting ring via the retaining groove such that the shutter ring is selectively shiftable between a mulching mode and a discharge mode.