Abstract: The disclosure relates to a method for controlling the crane of a working machine by using boom tip control, in which method the crane comprises at least two booms connected to the working machine and each other in an articulated manner, which booms are moved in relation to the working machine and to each other by means of actuators controlled by a control system of the working machine, and in which method the direction and speed of motion of the head of the crane, controlled by the driver applying controls in the working machine, is implemented by applying speeds of the different booms of the crane.

Abstract: 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.

Abstract: A working apparatus comprises a working machine, a tool, a boom construction, and a control system. A first end of the boom construction is connected to the working machine. The tool is connected to an opposite second end of the boom construction. The boom construction comprises a first boom and a first actuator controlling the first boom, a second boom articulated to the first boom and a second actuator controlling the second boom, and a third actuator controlling the position of the tool. The control system has a link mode, a parallel mode, and a tool-levelling mode.

Abstract: A system and a method for monitoring the performance of a subsystem of a forest machine. The method comprises the steps of: collecting data relating to the function of said subsystem or the performing of said function; determining one or more characteristic values to describe the performance continually according to data; and monitoring the variation of said one or more characteristic values in time, wherein, for example, the variation of said one or more characteristic values in time is displayed in the form of a graphic presentation to the user.

Abstract: A working apparatus comprises a working machine, a tool, a boom construction, and a control system. A first end of the boom construction is connected to the working machine. The tool is connected to an opposite second end of the boom construction. The boom construction comprises a first boom and a first actuator controlling the first boom, a second boom articulated to the first boom and a second actuator controlling the second boom, and a third actuator controlling the position of the tool. The control system has a link mode, a parallel mode, and a tool-levelling mode.

Abstract: A method for controlling a boom construction and a tool articulated thereto, the boom construction comprising a first boom and a first actuator controlling the same, a second boom articulated to the first boom, and a second actuator controlling the same, as well as a third actuator controlling the position of the tool, wherein in the method: the first actuator is controlled manually; and/or the second actuator is controlled manually and the third actuator is also controlled at the same time automatically to control the position of the tool. For example, the first actuator is controlled by use of a first set point; and/or the second actuator is controlled by use of a second set point; and in addition, the third actuator is controlled simultaneously by using for the control a variable dependent on at least one of said set points.

Abstract: A system and method for evaluating the productivity of a working machine and its driver in a real or virtual operating environment is controlled by a control system to perform work, and in which the work cycles relating to the work performed by the working machine are determined by continuous measurements directed to the working machine when it is controlled by the driver. Characteristic values relating to the performance of the determined work cycles are collected on the basis of the continuous measurements for the purpose of evaluating the performance of the work or for comparison.

Abstract: Method and safety device for a breaking saw chain. The safety device includes a protective wall positioned in the vicinity of the drive gear drawing the saw chain that is capable of receiving the movement of the tail of the broken saw chain and guiding the broken saw chain and the tail into the desired direction. The protective wall is moved in phase with a guide bar to hold the protective wall in the correct location during sawing in relation to the saw chain.

Abstract: A system and a method for monitoring the performance of a subsystem of a forest machine. The method comprises the steps of: collecting data relating to the function of said subsystem or the performing of said function; determining one or more characteristic values to describe the performance continually according to data; and monitoring the variation of said one or more characteristic values in time, wherein, for example, the variation of said one or more characteristic values in time is displayed in the form of a graphic presentation to the user.

Abstract: A control coupling of pressurized medium in a delimbing and cutting apparatus, provided for feeding members and for changing their feeding speed, said control coupling comprising at least: a first motor and a second motor that are coupled in parallel and drive a feeding member a third motor that is a multicapacity motor comprising a first half-motor and a second half-motor and that is coupled in series with the first motor and drives a feeding member; a fourth motor that is coupled in series with the second motor and drives a feeding member; first valve members that for the purpose of free rotation allow the feedback of the pressurized medium exiting the third motor to the first half-motor; and first control members that monitor the pressure of a first line and couple the first valve members to free rotation if said pressure is lower than the set value.

Abstract: Apparatus and method for changing one or several dimensions of a load space in a working machine, when the dimensions are width, height or length. In the method the weight of the load in the load space is determined or the weight of the load in a full load space is predicted on the basis of said determination and the current value of the dimension; a new value is calculated for the dimension by means of which it is possible to reach a set maximum quantity for the part of the weight of the load; and the dimension of the load space is adjusted either gradually or at once to a position according to the new value.

Abstract: An arrangement for the suspension of wheels of a working machine moving on a terrain, the arrangement comprising a pair of adjacent wheels arranged to support a frame part placed on a center line between the wheels; suspensions arranged between each wheel and the frame part to elevate and descend each wheel with respect to the frame part, wherein each suspension comprises a lower suspension arm and an upper suspension arm, which lower suspension arms are mounted by means of first joints to the frame part and by means of second joints to mounting arms, in which the wheels are mounted in a rotatable manner, and which upper suspension arms are fixed by means of third joints to the frame part and by means of fourth joints to the mounting arms, wherein, in each suspension, the first joint and/or the third joint is placed on said center line.

Abstract: A method for stabilizing an articulated vehicle, which articulated vehicle comprises at least a front frame structure and a rear frame structure, and a frame joint structure, which is arranged to couple the frame structures to each other and to allow them to rotate both in relation to each other, away from the normal position, as well as at the same time around an axis, which is substantially parallel to the longitudinal direction of the articulated vehicle. In the method a supporting force is maintained, which force affects between the frame structures and resists the rotation of the frame structures away from normal position, and the maximum of said supporting force is controlled in such a manner that it is dependent on the difference of rotations at least when said difference is increasing and at least when said difference is static.