A control device for a construction machine includes an operational amount data acquisition unit configured to acquire operational amount data indicating an operational amount of the working unit, an operation determination unit configured to determine a non-operation state of a bucket on the basis of the operational amount data, a bucket control determination unit configured to determine whether bucket control conditions are satisfied, on the basis of determination of the non-operation state, and a working unit control unit configured to output a control signal for controlling the bucket to maintain a state of the working unit, when the bucket control conditions are determined to be satisfied.

A shovel control method includes performing a plane position control or a height control of an end attachment by an operation of one lever. The plane position control is performed while maintaining a height of the end attachment. The height control is performed while maintaining a plane position of the end attachment.

An excavator comprises a chassis, an implement, and an assembly comprising a boom, a stick, and a coupling. The assembly is configured to define a heading {circumflex over (N)} and to swing with, or relative to, the chassis about a swing axis S. The stick is configured to curl relative to the boom about a curl axis C. The implement is coupled to a stick terminal point G via the coupling and is configured to rotate about a rotary axis R such that a leading edge of the implement defines a heading . An excavator control architecture comprises sensors and machine readable instructions to generate signals representative of {circumflex over (N)}, an assembly swing rate .sub.S about S, and a stick curl rate .sub.C about C, generate a signal representing a terminal point heading based on {circumflex over (N)}, .sub.S, and .sub.C, and rotate the implement about R such that approximates .

A method of controlling a lift arm actuator and a tilt actuator to control positioning of an implement carrier coupled to a lift arm of a power machine. An activation signal is received from an enabling input device. A lift arm control signal is received from a lift arm control input commanding movement of the lift arm. The lift arm actuator is controlled responsive to receipt of both of the activation signal and the lift arm control signal to move the lift arm to a target lift arm position and to move the implement carrier to or maintain the implement carrier at a target implement carrier orientation relative to a gravitational direction.

A shovel control method includes performing a plane position control or a height control of an end attachment by an operation of one lever. The plane position control is performed while maintaining a height of the end attachment. The height control is performed while maintaining a plane position of the end attachment.

A system and method are provided for assisting a machine operator in controlling a work tool of the machine. In an embodiment, the work tool is set at a first height and the machine is travelling at a first machine speed, resulting in a first work tool or machine load. Based on these factors, a first work tool control mode or second work tool control mode is chosen. In the first work tool control mode, the work tool is manually controlled within a load limit and a work tool height limit, whereas in the second work tool control mode, the work tool load is controlled toward the first work tool load. Based on operator inputs and machine state, as well as other factors such as ground surface, the machine may switch between control modes, or out of automatic work tool control entirely.

A mobile device includes a frame with displacement means, a working arm connected to the frame including at least a first and a second articulation which are hinged to each other. The working arm is hinged to the frame, and at least a first, second and third control devices are adapted for moving the first and second articulation of the working arm and a tool, respectively, at a free end of the second articulation. A control system is adapted for controlling the first, second and third control means. The control system is adapted to drive the first, second and third control means such that the free end of the second articulation follows a predetermined upward movement along an upwardly directed path and the tool remains in a lifting position, the first, second and third control means are simultaneously controlled.

A shovel includes a lower traveling body, an upper turning body turnably mounted on the lower traveling body, a boom attached to the upper turning body, an arm attached to the boom, an end attachment attached to the arm, a sensor configured to output detection information about an orientation of a work part of the end attachment, and a processor configured to control operation of the work part to cause the work part to perform compaction of ground by pressing the work part against the ground, wherein the processor is configured to control an operation of the arm and the end attachment according to a lowering operation of the boom to cause an end portion of the work part to perform the compaction of the ground on the basis of the detection information of the sensor.

A method of operating a digging machine, including operationally connecting a sensor to a bucket, operationally connecting an electronic controller to the sensor and to each respective hydraulic cylinder, operationally connecting a valve system to the hydraulic cylinder and to the electronic controller, inputting a desired post excavation landscape contour into the electronic controller, inputting locations of underground objects into the electronic controller, automatically actuating a bucket hydraulic cylinder operationally connected to the bucket, and automatically controlling the bucket hydraulic cylinder to dig within predetermined parameters.

A hydraulic actuator includes a control valve unit that controls a flow of a hydraulic fluid supplied from a hydraulic pump to a plurality of hydraulic actuators, a plurality of control lever devices that output a pilot pressure actuating the control valve unit, with use of a discharged pressure from a pilot pump as a source pressure, a solenoid valve unit including a plurality of solenoid pressure reducing valves connected between the plurality of control lever devices and the control valve unit, and a controller configured to calculate velocity limits for the plurality of hydraulic actuators on the basis of signals from a plurality of posture sensors and control openings of the solenoid pressure reducing valves, in which the controller is configured to control the openings of the solenoid pressure reducing valves for arm crowding and arm dumping to be larger than an opening based on the velocity limits while a boom raising operation signal is being output from the control lever devices.