A cable use system includes a plurality of support posts, a cable supported by the support posts, a winding device configured to wind the cable, a hoisting device coupled to the cable and configured to move in an air when the cable is wound by the winding device, and a cutting device hung from the hoisting device. The cutting device includes a cutting unit configured to cut a surface side of a tree all around.

The present invention relates to a system (10) for remote and/or autonomous selecting a tree to be harvested and/or to be transported, said system comprising: a remotely and/or autonomously controlled Unmanned Aerial Vehicle (100), UAV, comprising, at least one means for holding (105) and/or harvesting said at least a portion of a tree, means for detecting said a tree to be transported and/or harvested, means for detecting at least one of the group of tree parameters: diameter of said tree, length of said tree, tree species of said tree and/or the weight of said tree, a base station (120) for communication with said means configured for holding (105) and/or harvesting said tree and said UAV (100), and means configured for selecting at least a portion of a tree to be harvested and/or transported depending on at least one of said detected tree parameters.

The invention relates to a system (10) for remote and/or autonomous harvesting at least a portion of a tree, said system (10) comprising: a remotely and/or autonomously controlled means (110) configured for harvesting said at least a portion of a tree, a remotely and/ or autonomously controlled Unmanned Aerial Vehicle (100), UAV, comprising, at least one means for holding (105) said harvested portion of said tree and being configured for transporting said harvested portion of said tree away from the original location of the tree, wherein said system comprising at least one means for detecting said tree to be harvested, and a base station (120) for communication with said means configured for harvesting at least a portion of a tree and/or said UAV. The invention also relates to a method for remotely and/or autonomously harvesting a tree.

A pressure compensated load sense hydraulic system and method is disclosed where a first pressure compensated valve controls flow between a pump and a first function based on a highest function load; and a second pressure compensated valve controls flow between the pump and a second function based on the highest function load. First and second operator controls activate the first and second functions, respectively. When the first function is stalled and the second function is activated, the controller closes the first valve to remove the first function load from the load sense circuit and prevent flow to or from the first function. The controller can determine the first function is stalled when a timer exceeds an initialization period. When the controller closes the first valve, it can cycle the first valve between a shutoff period where the valve is closed, and a refresh period where the valve is opened.

A control system for controlling a moveable device includes at least one hydraulic actuator associated with the moveable device, at least one position sensing device to determine the position of the moveable device or the actuator, or both, and a hydraulic control system, including an electronic control unit, for controlling the actuator. For performing a control method, the hydraulic control system is configured to deliver pressurized hydraulic fluid to the actuator, the hydraulic fluid being pressurized at most to a predetermined maximum pressure, and the control system is adapted to regulate the predetermined maximum pressure based on the determined position. According to an example, the moveable device is a boom of a working machine. According to a further example, the actuator is a hydraulic cylinder or motor.

A work machine (1) comprises at least one structural element (21), at least one pressure medium operated actuator 22) for establishing at least one operation of the work machine, and at least one detection device (23) to determine the position of the structural element (21) of the work machine. An arrangement for controlling at least one operation of the work machine (1) comprises: a control valve arrangement (24) for controlling the actuator (22), and a control device (25) for controlling the control valve arrangement (24). The control device (25) is adapted to control said control valve arrangement (24) for adjusting the pressure and/or volume flow on the return line of the actuator (22) as dependent on the position of the structural element (21).

The present invention relates to a grapple carriage for uphill, downhill and horizontal cabling of lumber and long goods. The carriage determines its absolute and relative position in space by means of a learning run or measuring run. During this run, a topographic ground profile and/or altitude profile is produced, and the position of the trees or long goods to be transported is analyzed. A central open-loop and/or closed-loop control unit processes all the machine status information which has been recorded and/or transmitted by the winch or yarder.

The invention relates to a system for remote and/or autonomous holding at least a portion of a tree trunk, said system comprising: a remotely and/or autonomously controlled Unmanned Aerial Vehicle (100), UAV, at least one remotely and/or autonomously controlled means (105) for holding at least a portion of a tree trunk attachable to said UAV (100), means for detecting at least a portion of a tree, means for detecting at least one tree parameter of at least a portion of a tree and/or at least one growing condition of at least a portion of a tree, a base station for communication with said UAV (100), means configured for directing said means (105) for holding at least a portion of a tree trunk to a particular position of said tree trunk depending on said at least one detected tree parameter and/or said at least one detected growing condition.

A solution for presenting information describing an operation of a forest work unit includes identifying a change affecting the operation of the forest work unit and storing information relating to the change, determining at least one key indicator describing the operation of the forest work unit, and presenting the key indicator describing the operation of the forest work unit and the changes taking place during a monitoring period.

A collection method using a collection system including a lifting device that is configured to wind up an overhead line supported by a support post, a suspension device that is connected to the overhead line and is movable in the air as the lifting device winds the overhead line, and a grip device suspended from the suspension device includes a step of gripping a tree by the grip device at two points, a step of cutting the gripped tree, a step of tilting the cut tree such that a longitudinal direction of the tree is along a horizontal direction, and a step of conveying the tree gripped by the grip device as the lifting device winds the overhead line.