A method of and arrangement for monitoring the collection of plant material includes the following steps and apparatus for executing these steps, respectively: collecting plant location and attribute data with respect to plant material, before and/or during and/or after harvesting the plant material, providing the plant location and attribute data on a collecting vehicle adapted to collect the harvested plant material, moving the collecting vehicle to the harvested plant material based on the plant location data, collecting the harvested plant material, sensing attribute data of the harvested plant material before and/or during and/or after the collecting, and comparing the sensed attribute data with the plant attribute data and generating an output dependent on the result of the comparison.

The disclosure relates to a harvester (10) for harvesting logs. The harvester comprises a traction arrangement (11) configured to drive the harvester, an articulated boom (13) configured to connect to a processing head, a fuel reservoir, an electrical energy generator fuelled by a fuel from the fuel reservoir and configured for supplying power to the traction arrangement and the articulated boom, and an electrical connector (17) configured for coupling the electrical energy generator to an electrical energy storage of a shuttle. The harvester is configured to load a harvested log onto a coupled shuttle and charge the electrical energy storage of said coupled shuttle using electrical energy from the electrical energy generator.

The present invention relates to a system for remote and/or autonomous cutting at least a portion of a harvested ligno trunk, at least a portion of a ligno trunk to be harvested, at least a portion of a ligno trunk during harvesting or at least a portion of a ligno trunk during transporting, said system comprising: a remotely and/or autonomously controlled Unmanned Aerial Vehicle (100), UAV, means for cutting at least a portion of a ligno trunk attachable to said UAV, means for detecting at least a portion of a ligno, means for detecting at least one ligno parameter of at least a portion of a ligno and/or at least one growing condition of at least a portion of a ligno, a base station (120) for communication with said UAV, and means configured for selecting at least one cutting position on at least a portion of a ligno trunk depending on the at least one detected ligno parameter and/or the at least one detected growing condition of at least a portion of a ligno.

The present invention relates to a system for remote and/or autonomous cutting at least a portion of a harvested ligno trunk, at least a portion of a ligno trunk to be harvested, at least a portion of a ligno trunk during harvesting or at least a portion of a ligno trunk during transporting, said system comprising: a remotely and/or autonomously controlled Unmanned Aerial Vehicle (100), UAV, means for cutting at least a portion of a ligno trunk attachable to said UAV, means for detecting at least a portion of a ligno, means for detecting at least one ligno parameter of at least a portion of a ligno and/or at least one growing condition of at least a portion of a ligno, a base station (120) for communication with said UAV, and means configured for selecting at least one cutting position on at least a portion of a ligno trunk depending on the at least one detected ligno parameter and/or the at least one detected growing condition of at least a portion of a ligno.

The method for controlling a forest harvester includes measuring, when carrying out an operation, rotational speed of an engine; automatically determining, in a control electronics, a relative or absolute difference between the measured rotational speed of the engine and a predetermined guideline for the rotational speed of the engine, the guideline defining a preferred rotational speed or a range of preferred rotational speeds for the operation that is being carried out; and automatically notifying, by the control electronics, an operator of the forest harvester, that the determined difference either follows the guideline or the determined difference deviates from the guideline. The engine being adapted to deliver predetermined power levels during the operation.

The method for controlling a forest harvester includes measuring, when carrying out an operation, rotational speed of an engine; automatically determining, in a control electronics, a relative or absolute difference between the measured rotational speed of the engine and a predetermined guideline for the rotational speed of the engine, the guideline defining a preferred rotational speed or a range of preferred rotational speeds for the operation that is being carried out; and automatically notifying, by the control electronics, an operator of the forest harvester, that the determined difference either follows the guideline or the determined difference deviates from the guideline. The engine being adapted to deliver predetermined power levels during the operation.

A tree harvester is disclosed that includes first and second hydraulic pumps for powering a harvesting head of the tree harvester.

A tree harvester is disclosed that includes first and second hydraulic pumps for powering a harvesting head of the tree harvester.

A work machine to cut timber including a control system, a felling head, a hydraulic motor configured to adjust the position of the felling head, and a spool valve operatively connected to the hydraulic motor, the spool valve being configured to move the felling head responsively through operation of the hydraulic motor. A machine controller coupled to the operator controller and the spool valve executes stored program instructions to generate a first control signal responsive to an operator control signal provided by the operator controller, generate a second control signal as a function of the generated first control signal, adjust a position of the spool of the spool valve in response to a concurrent receipt of the first control signal and the second control signal by the first proportional control valve and the second proportional control valve to move the felling head through operation of the hydraulic motor.

A hydraulic arrangement and method in connection with a cutting device includes a hydraulic input line, a hydraulic motor, a return line from the hydraulic motor, a hydraulic cylinder for pressing the cutting device, a feed line for the hydraulic cylinder, connected in parallel with the hydraulic motor to the input line, and a directional control valve and a pressing line and a lifting line. The hydraulic arrangement further includes a throttle for throttling the flow exiting from the hydraulic motor in the return line, and a pressure valve located between the said pressing line and the pressure side of the throttle, for controlling the hydraulic cylinder on the basis of the speed of rotation of the hydraulic motor.