A system and a method for controlling a tool pivotably mounted to an articulated boom connected to a work machine having a control unit. The solution: 1) determining the direction a predetermined point of the boom or the tool is moving to, i.e. the moving direction, and 2) controlling orientation of the tool as a function of one or several predetermined dependencies, the predetermined dependencies defining at least the orientation of the tool in relation to the moving direction. According to an example the work machine is a forest machine.

A method of operating a digging machine, including damping the response of a boom hydraulic cylinder operationally connected to a boom arm and actuating a bucket hydraulic cylinder operationally connected to a bucket.

A work machine, such as an excavator or a backhoe, has a linkage of articulating arms for maneuvering a changeable work tool. Position and motion sensors and force sensors within the linkage provide data for a controller to determine a location of the work tool and down force applied from the linkage onto the work tool during a job. Before performing a grading operation, an operator may request level control for the work tool at a benchmark orientation and down-force control at a target down force. After a controller applies the target down force with the work tool at the benchmark orientation, an operator may traverse the work tool along a path radial to the work machine. While maintaining the benchmark orientation for the work tool, the controller may adjust one or more forces on the linkage to also maintain the target down force during the traversal of the work tool, leading to simpler functionality for the operator and higher quality work product.

A method and a system for controlling a parallel crane on a working machine by means of TCP control. According to the method, the parallel crane has a crane arm system with crane parts with a lifting arm section with two parallel arms, a rocker arm with a telescoping push arm, which crane parts are articulately mutually connected and to the working machine and can be displaced through impact of actuators and activators, which are controlled and monitored by a control system by which direction and motion speed of the parallel crane Tool Center Point (TCP) controlled by an operator using joysticks in the working machine, by applying speeds for the various crane parts of the parallel crane. A characteristic is that the speeds of the various crane parts of the parallel crane are automatically determined by the control system based on the position of the various crane parts.

A method for automatically adjusting the position of an implement of a lift assembly of a work vehicle includes receiving an input associated with raising a boom of the lift assembly relative to the ground, monitoring an implement angle relative to a target implement angle as the boom is being raised, and identifying an implement angle error relative to the target implement angle as the boom is moved following the target implement angle initially being reached. In addition, the method includes selecting a closed-loop control algorithm to control movement of the implement based at least in part on a sign of the implement angle error, wherein the closed-loop control algorithm corresponds to a closed-loop position control algorithm when the implement angle error is a positive implement angle error and a closed-loop velocity control algorithm when the implement angle error is a negative implement angle error.

The invention provides a construction machine control system comprising a working tool (7), a working arm (5) for supporting the working tool and for operating the working tool as required, a machine body (2) for supporting the working arm and for being rotatable, a rotating direction acquiring unit (13, 14) provided on the machine body, a control unit having a storage unit and a display unit, wherein the working arm is configured by two or more links with length already known respectively which are connected in a bendable manner, wherein there are further provided a two-axis tilt sensor on the machine body for detecting a horizontal position, a working arm tilt sensor for detecting a tilting of each links of the working arm, and a working tool tilt sensor for detecting a tilting of the working tool, wherein the control unit displays a guidance screen on the display unit based on a working data stored in the storage unit and where a working position and a design gradient are set, based on a direction of the machine body acquired from the rotating direction acquiring unit, and based on detection results of the two-axis tilt sensor, the working arm tilt sensor and the working tool tilt sensor, and the guidance screen displays a guiding information for guiding the working tool to the working position.

A control system for automatic excavator bucket leveling and load dumping preferably includes a controller, a bucket angle sensor, a chassis angle sensor and at least one switch. The controller preferably includes an absolute angle routine, a bucket leveling routine, an automatic load dumping routine and a joystick monitoring routine. The bucket angle sensor is mounted to the bucket. The excavator angle sensor is mounted to an excavator body. The controller receives input from the at least one switch, the angle sensors and excavator joystick for processing by the absolute angle routine, the bucket leveling routine, the automatic load dumping routine and the joystick monitoring routine to level an excavator bucket or dump the excavator bucket with a bucket actuator. A hydraulic control circuit receives input from the controller to control the movement of the bucket actuator.

A method for automatically adjusting the position of an implement of a lift assembly of a work vehicle includes receiving an input associated with raising a boom of the lift assembly relative to the ground, monitoring an implement angle relative to a target implement angle as the boom is being raised, and identifying an implement angle error relative to the target implement angle as the boom is moved following the target implement angle initially being reached. In addition, the method includes selecting a closed-loop control algorithm to control movement of the implement based at least in part on a sign of the implement angle error, wherein the closed-loop control algorithm corresponds to a closed-loop position control algorithm when the implement angle error is a positive implement angle error and a closed-loop velocity control algorithm when the implement angle error is a negative implement angle error.