A collision avoidance system for a work machine includes at least one sensor configured to generate a signal indicative of a presence of at least one obstacle in a surrounding area of the work machine. The collision avoidance system also includes a controller communicably coupled with the sensor. The controller is configured to receive the signal indicative of the presence of the obstacle in the surrounding area of the work machine from the sensor. The controller is also configured to determine a position of the obstacle relative to the work machine based on the signal received from the sensor. The controller is further configured to generate a control signal to prevent a movement of the work machine, halt the movement of the work machine, or reduce a velocity of the work machine based on the determination of the position of the obstacle.

In a construction method using an excavator that is controlled by manual operation, and an excavator that includes an automatic working-equipment control unit automatically controlling second working equipment on the basis of at least one of a current terrain and a designed terrain of a construction range in a construction site, and a tooth-edge position of the second working equipment, a progress rate that indicates a volume of soil having been excavated by the excavator to a target volume of soil to be excavated by the excavator in the construction range is calculated, and when the progress rate is equal to or larger than a threshold, the excavator stops construction of the construction range, and the excavator takes over the construction of the construction range, from the excavator.

Described is ballast for a rotary tower, comprising: a main body (10), equipped with coupling means designed to allow a connection to the rotary tower; a detecting device (11, 12, 13), associated with the main body (10), designed for detecting the presence of an obstacle positioned at a distance less than a predetermined safety distance from the main body (10), and for emitting a proximity signal, signifying the presence of an obstacle at a distance less than the safety distance from the main body (10).

Provided is a work machine that can operate a front work implement at a speed according to an operator's lever operation while securing the accuracy of work by machine control. A hydraulic excavator 1 includes a controller 20 that sets a target surface for a bucket 10 and controls the operation of a front work implement 1B in such a manner that the bucket does not penetrate to below the target surface. The controller sets a speed correction region on an upper side of the target surface, varies a width R of the speed correction region in accordance with an operation amount of an operation device 15A or 15C, and controls the operation of the front work implement in such a manner that the work tool does not penetrate into the speed correction region.

A shovel includes a lower traveling body, an upper swiveling body that is rotatably mounted on the lower traveling body, and a controller configured to perform straight facing control by which an actuator is operated to cause the upper swiveling body to face a target construction surface straight, based on information related to the target construction surface and information related to a direction of the upper swiveling body.

A stage specifying unit specifies a work stage of a work machine. A target decision unit decides target postures of a boom and an arm based on the specified work stage. A control amount calculation unit calculates a control amount of the boom and the arm based on the target postures. A limiting unit limits the control amount of the arm such that a change amount of the control amount of the arm is within a predetermined change amount when the specified work stage is a work stage related to a hoist swing.

A hydraulic system for controlling an implement on a work machine may include a hydraulic reservoir, a hydraulic pump in fluid communication with the reservoir, a central valve in fluid communication with the pump and configured for controlling the implement, a load sense pressure relief system, and a controller. The controller may be configured for controlling the central valve and the load sense pressure relief system and selecting between operating the hydraulic system at a first pressure and a second pressure based on a factor relating to implement position.

An excavator according to the present disclosure includes a display device, a control unit, a limit height setting unit, and a warning height setting unit. The display device displays shapes of a boom, an arm, and a bucket of an excavator and a terrain where the excavator is located. The control unit calculates maximum heights of the boom, the arm, and the bucket from the ground. The limit height setting unit is provided in the display device and is set with a limit height required for work in the terrain where the excavator is located by a user. The warning height setting unit is provided in the display device and is set with a warning height lower than the limit height. The display device displays the limit height and the warning height together with the terrain where the excavator is located.

A construction machine control system includes: a target construction ground shape generation unit which generates a target construction ground shape indicating a target shape of an excavation target; a working device control instruction determination unit which outputs an instruction for driving the working device in a working device operation plane orthogonal to at least one of a boom axis, an arm axis, and a bucket axis based on an operation state of at least one of an arm and a bucket and a distance between the bucket and the target construction ground shape; and a tilting control instruction determination unit which outputs an instruction for performing a tilting control of the bucket about a tilting axis based on a tilting state of the bucket and the distance between the bucket and the target construction ground shape.

A construction machine control system includes: a target construction ground shape generation unit generating a target construction ground shape indicating a target shape of an excavation target; a tilting data calculation unit calculating tilting data of a bucket tilted about a tilting axis; a regulation point position data calculation unit calculating position data of a regulation point set in the bucket based on external shape data of the bucket including at least width data of the bucket; a tilting target ground shape calculation unit calculating a tilting target ground shape extending in a lateral direction of the bucket in the target construction ground shape based on the position data of the regulation point, the target construction ground shape, and the tilting data; and a working device control unit controlling a tilting of the bucket based on a distance between the regulation point and the tilting target ground shape.