The invention relates to a method (19) of operating a hydraulic arrangement (1) including a mounting base (5), a boom (3) that is pivotably arranged on the mounting base (5), and a Z-kinematics (2) that is arranged on the boom (3). The Z-kinematics (2) tilts a tool attachment device (10), that is pivotably arranged on the boom (3). The boom (3) is moved by a lifting hydraulic piston (7) that is connected to the boom (3) and to the mounting base (5). The Z-kinematics (2) is moved by at least a tilting hydraulic piston (11) that is connected to a lever of the Z-kinematics (2) and to the mounting base (5). On application of an input control command for changing the position of the lifting hydraulic piston (7), a compensation command is automatically generated and applied to the tilting hydraulic piston (11), to essentially maintain the attitude of the tool attachment device (10). The compensation command is generated based on the input control command for the lifting hydraulic piston (7), using a mathematical model of the hydraulic arrangement (1).

A method is disclosed. The method may include controlling a leading edge of an implement of a machine using a first control loop to cause the implement to align to a defined design plan; controlling a trailing edge of the implement of the machine using a second control loop to cause the implement to align to the defined design plan; and selectively altering a gain to the second control loop based on a detected deviation of the implement from the defined design plan to increase an angle of approach, using the first control loop, when the implement is positioned above the defined design plan and decrease the angle of approach, using the first control loop, when the implement is aligned to the defined design plan.

A work machine includes a mainframe, a boom moveable relative to the mainframe, a work implement coupled to and moveable relative to the boom. The work machine further includes a work-implement operator control configured to transmit a signal indicative of a work-implement movement command, a boom operator control configured to transmit a signal indicative of a boom movement command, and a boom sensor configured to detect a movement of the boom and transmit a signal indicative of the detected movement of the boom. The work implement further includes a controller configured to receive signals from the work-implement operator control, the boom operator control, and the boom sensor. The controller is further configured transmit a signal to cause movement the work implement relative to the boom based on the detected movement of the boom and the work-implement movement command.

A control device includes a bucket position-determining unit, a target working line-determining unit, a distance-determining unit, and a bucket control unit. The bucket position-determining unit determines a position of a bucket. The target working line-determining unit determines a target working line indicating a target shape of an object to be excavated by work equipment. The distance-determining unit determines a distance between the bucket and a reference position which is an end of the target working line. The bucket control unit controls the bucket such that an angle of the bucket becomes a uniform angle, when the distance between the bucket and the reference position is equal to or greater than a bucket control-limiting threshold value.

A work vehicle comprising a frame supported by a ground engaging device. A boom assembly is coupled to the frame. An attachment coupler is coupled to the boom assembly. An electronic data processor is communicatively coupled to a boom actuator, an attachment coupler actuator, a boom sensor, an attachment coupler sensor, and an operator input device. A computer readable storage medium comprising machine readable instructions that, when executed by the processor, cause the processor to receive an operator input and for a tilt forward command, command the boom actuator to move the boom assembly to a frame contact position and then command the attachment coupler actuator to move the attachment coupler towards a lower position. For a tilt rearward command, command the attachment coupler actuator to move the attachment coupler towards an upper position and then command the boom actuator to move the boom assembly towards a raised position.

A work vehicle is disclosed. The work vehicle comprises an attachment comprising a cutting edge. The attachment is configured to move from an operating position to a dump position. An operator input device is configured to receive a grade command. A grade control system is communicatively coupled to an operator input device and configured to receive the grade command and define a cutting plane. A controller is configured to receive a boom position signal, an attachment position signal, and the grade command. The controller is configured to maintain the cutting edge on the cutting plane in both the operating position and the dump position.

A hydraulic system includes a first supply line connecting a boom control valve and a bottom side of a boom cylinder, a second supply line connecting the boom control valve and a rod side of the boom cylinder, a leveling switch valve having: a first operating position allowing a leveling operation of a working tool; and a first stopping position allowing the leveling operation to stop, a ride controller including: a ride-control switch valve connected to a branched fluid line branched from the first supply line; and an accumulator configured to perform an anti-vibrating operation for suppressing a pressure fluctuation of the boom cylinder, and a drain fluid line to discharge operation fluid in a downstream section extending from the leveling switch valve to the rod side of the boom cylinder in the second supply line when the leveling switch valve is switched to the first stopping position.

This disclosure provides an overshot loader mechanism for transporting material in an overhead trajectory from a filling to a discharge position. The overshot loader mechanism includes at least one control arm, pivotally connected at one end to a chassis frame, and at the other end to a thrust end of the load arm, and a bucket pivotally connected to a load end of the load arm. Rotation of the control arm about its pivotal connection moves the thrust end of the load arm from a terminal high point, where the load end of the load arm is located towards the bottom of its trajectory for bucket filling, to a terminal low point, where the load end of the load arm is located towards the height of its trajectory. This configuration reduces the centre of gravity of the loader mechanism, while retaining sufficient bucket height to clear the vehicle's operator cab.

Automatic tilt command system of a hydraulically driven boom moveably connected with one end to a chassis of a working machine, wherein a tiltable tool is attachable to the other end. The system further comprises a first electronic control valve for controlling a fluid flow to and from a boom lift cylinder for moving of the boom and a second electronic control valve for controlling a fluid flow to and from a tilt cylinder for tilting the tool. A control unit receives input signals with regard to moving the boom and transmits based on the received input signals actuating signals to the first electronic control valve in order to move the boom. In parallel the control unit transmits tilting signals to the second electronic control valve which are based on a predetermined fluid flow ratio defined by the fluid flow for the boom movement and the fluid flow for tool levelling, so that the tool maintains its inclination angle with respect to the horizontal.

A grading control system may have a lift actuator to raise or lower a work implement, and a tilt actuator to tilt the work implement. The grading control system may also have a first sensor that communicates a signal indicative of a position of the work implement, and a second sensor that communicates a signal indicative of a position of the machine frame. The grading control system may have a controller to determine a track plane of the machine and a desired grade relative to the track plane. Further, the controller may determine an orientation of the work implement relative to the track plane to maintain the desired grade based on the sensor signals. The controller may also be configured to actuate one or both of the lift and the tilt actuators to orient the work implement according to the determined orientation.