Abstract: There is provided a work machine which can improve accuracy of control of an actuator when a pressure difference between a hydraulic pump and the actuator is large and the demanded flow rate of the actuator is small. An auxiliary flow rate controller is configured such that an opening area of a main valve changes between a maximum opening area and zero according to the opening area of a pilot variable restrictor when the opening area of the pilot variable restrictor is equal to or more than a predetermined opening area and that the opening area of the main valve is zero irrespective of the opening area of the pilot variable restrictor when the opening area of the pilot variable restrictor is less than the predetermined opening area.

Abstract: To provide a work machine that enables enhancement of shaping accuracy near a boundary line between two adjacent target surfaces. A controller 10 extracts, from among a plurality of target surfaces, a second target surface S2 that is a target surface adjacent to a first target surface S1, calculates a boundary line L2 between the first target surface S1 and the second target surface S2, and, prior to a work tool 6 passing the first boundary line L2, corrects a control signal for a posture control actuator 6c such that the angular difference EL between a reference line L1 set on the work tool 6 and the boundary line L2 becomes small.

Abstract: A type of an object is determined and the movement direction of the object is predicted on the basis of a sensing result of the object sensed by an on-machine obstacle sensor. Information relating to the object that is the object sensed by the on-machine obstacle sensor and has been determined to have moved to the outside of a sensing range of the on-machine obstacle sensor is immediately deleted from an environment map on the basis of the type and the movement direction of the object. This can properly process information on the object that has gotten out of the sensing range, according to the cause of the object getting out of the sensing range.

Abstract: Provided is a control system for a work machine that allows a worker in the operation around the work machine to safely approach the work machine. The control system for a work machine includes: a work machine 1 including a work implement 7, a lock mechanism 14 for the work implement 7, a lock controller 13 that controls the lock mechanism 14, and a communication device 20; and a communication terminal 30 that is able to communicate with the communication device 20 of the work machine 1. The lock controller 13 controls the lock mechanism 14 so as not to be released from a locked state in a case receiving a lock demand signal from the communication terminal 30, and controls the lock mechanism 14 so as to be released from the locked state in a case receiving a lock demand cancellation signal from the communication terminal 30.

Abstract: Provided is a control device for a wheel loader that is capable of improving the productivity of excavation work by reducing the work time required for the excavation work. A control device 120 is a control device for a wheel loader 1 that excavates a target by moving a vehicle body 2 forward with rotation of wheels 5f, 5r to plunge a bucket 3 into the target. The control device 120 moves the vehicle body 2 forward with the bucket 3 plunged into the target, and brakes the wheels 5f, 5r when a rotational speed of the wheels 5f, 5r exceeds a predetermined threshold BS.

Abstract: An object of the present invention is to provide a work machine that makes it possible to perform, with a simple configuration, speed control of respective actuators and thrust control of a particular actuator that regenerates the flow of a return fluid, at the time of combined operation to simultaneously drive the particular actuator and another actuator. For this purpose, a controller calculates a target thrust that is a target value of a thrust of the particular actuator on the basis of an input amount of an operation device and an output value of a posture sensor, calculates a target meter-out pressure that is a target value of a meter-out pressure of the particular actuator on the basis of the target thrust and a meter-in pressure of the particular actuator, and calculates a regeneration control valve target opening area that is a target value of an opening area of a regeneration control valve on the basis of the target meter-out pressure and the meter-out pressure of the particular actuator.

Abstract: There are provided: a monitoring apparatus that detects an obstacle located around a hydraulic excavator, and outputs obstacle information; and a controller that calculates an operation limiting command for limiting operation of the hydraulic excavator in accordance with an intrusion prohibited area set on the basis of a result of comparison between a movable range of the hydraulic excavator and a monitoring range of the monitoring apparatus and in accordance with the obstacle information from the monitoring apparatus. Thereby, it is possible to appropriately set an intrusion prohibited area, and reduce detection failures and detection errors.

Abstract: The present invention intends to provide a work machine that can execute speed control of an actuator and torque control of a swing motor by a simple configuration at the time of combined operation to simultaneously drive the swing motor and the other actuator. For this purpose, a controller calculates a pump target flow rate on the basis of an actuator target flow rate and a swing target flow rate and calculates a target meter-in opening area of an actuator directional control valve on the basis of the actuator target flow rate, a pump pressure, and an actuator meter-in pressure. The controller calculates target torque of the swing motor on the basis of the input amount of operation devices and output values of posture sensors and calculates a swing target meter-out pressure on the basis of the target torque and a swing meter-in pressure.

Abstract: The present invention intends to provide a risk management system that can accurately extract information necessary for analysis of a variety of accidents in which a machine is involved. For this purpose, a controller calculates a main risk that is the degree at which a main factor of an accident contributes to the occurrence of the accident on the basis of an evaluation value of the main factor, and calculates a subsidiary risk that is the degree at which a subsidiary factor of the accident contributes to the occurrence of the accident on the basis of an evaluation value of the subsidiary factor.

Abstract: Provided is a work machine capable of eliminating the inconvenience from the operator of the work machine as much as possible while deterring a contact between the work machine and workers, and suppressing a decrease in productivity of the work machine. A work machine 5 includes: an identification information recognition device 41 configured to recognize identification information on a person who enters a predetermined region R around the work machine 5; and a controller 7 configured to control the work machine in accordance with the identification information.

Abstract: An action management section 211 acquires a work instruction 230, which includes a final target position, and a current position of a work machine 100 to set a target position, a route planning section 212 generates a target route 240 between the current position and the target position, an operation generation section 213 causes the work machine 100 to travel in accordance with the target route 240, and upon receiving an evacuation instruction 250 including evacuation possible positions based on a work range of another work machine different from the work machine 100, the action management section 211 decides an evacuation position from among the evacuation possible positions based on the work range of the other work machine and at least one of the current position and final target position of the work machine 100 to set it to the target position.

Abstract: A construction management device computes a risk indicative of a degree of danger with which an accident occurs on the basis of information relating at least to a position of a worker measured by a worker position measuring device and a worker biometrical information measuring device, information relating at least to a position of a hydraulic excavator measured by a machine body position measuring device, a machine body posture measuring device, a machine front implement posture measuring device, and a machine operator biometrical information measuring device, personal information on a worker and an operator registered in a worker information registration device, and information on a construction environment from an environment information registration device, and outputs the computed risk as a coordinate risk associated with coordinates of the construction environment to a risk display device such that the computed risk is displayed in a map format on the risk display device.

Abstract: An operation assistance system for a work machine includes an operation assistance function and a work assistance function. Both of the operation assistance function and the work assistance function are switchable between enabled and disabled states. When the work assistance function is in an enabled state and when the work area is set outside of the stop area to surround the stop area, the operation assistance system sets the work area as the stop area such that the stop area is extended and overlaid on the work area, and automatically enables the operation assistance function when the operation assistance function is in a disabled state.

Abstract: A construction machine includes a posture sensor provided on a front member of a front work implement. An external environment recognition device detects an object around a main body, and a controller calculates a dead angle range from a recognition range of the external environment recognition device. An assumed movement range in which a moving body is assumed to exist in the dead angle range in a period of time determined in advance is calculated; and a movable range within which the front work implement is movable in a period of time determined in advance is calculated on the basis of the posture information detected by the posture sensor. Preventative control is then performed for preventing contact between the moving body and the front work implement on the basis of the assumed movement range of the moving body and the movable range of the front work implement.

Abstract: Provided is a work machine control system which enables a worker to perform a work more easily in the vicinity of a work machine executing a task automatically. A work machine control system comprises: a work machine that executes a task automatically as a work to be executed; and a task control device for controlling execution of the task. The work machine comprises a vehicle body control device and a hydraulic actuator used for executing the task, wherein the vehicle body control device comprises: a task content input section for receiving input of task content information; a movement control section for calculating a speed instruction of the hydraulic actuator based on the task content information; a receiving section for receiving task control information outputted from the task control device having a task control input section for receiving input of the task control information; and a task control section for controlling execution of the task based on the task control information.

Abstract: In a case that a change instruction to instruct to change a work area A1 to a requested work area A2 is input, whether or not change of the work area A1 to the requested work area A2 is possible is judged on the basis of the work area A1, location information of a machine main body configured by an upper swing structure 10 and a lower track structure 9, and posture information of a work device 15, and the work area A1 is overwritten with the requested work area A2 to change the work area in an only case that it is judged that change is possible. This can suppress interference between plural work machines.

Abstract: A construction assisting system including a controller that performs construction assistance processing on the basis of positional relation between a worker and a hydraulic excavator, the construction assisting system including: an approach intention detecting device that detects an intention of the worker to approach the hydraulic excavator; an approach intention presenting device that presents a detection result of the approach intention detecting device to an operator of the hydraulic excavator; and an approach confirmation obtaining device that obtains a confirmation state of the operator of the hydraulic excavator for contents presented by the approach intention presenting device, the controller performing the construction assistance processing on the basis of position information of the worker when the operator of the hydraulic excavator denies the approach of the worker or when the operator of the hydraulic excavator does not confirm the intention of the worker to approach.

Abstract: A work machine that can keep the control accuracy of actuators irrespective of temperature variation of a hydraulic operating fluid that passes through flow rate controllers that control the flow rates of supply to the actuators is provided. For this purpose, the flow rate controllers each have a valve body that is disposed on a main hydraulic line connecting a delivery line of a hydraulic pump and the actuator and that moves according to an operation pressure from a solenoid proportional pressure reducing valve, a sampling hydraulic line that branches from the main hydraulic line, and a temperature sensor set on the sampling hydraulic line. The controller is configured to correct a command electrical signal to the solenoid proportional pressure reducing valve according to a signal from the temperature sensor.

Abstract: Provided is a work machine that can suppress decrease in work efficiency while reducing the possibility of contacting a worker or a dump truck, etc. A movement range is set in advance so as to avoid entry of a worker or a dump truck, etc. into the set movement range. The work machine performs stop control with clearance for an obstacle having entered the movement range, but performs stop control with relatively small clearance (minimum clearance) for a movement range. Thus, the work machine can reduce the frequency of stopping a body or a work implement and suppress decrease in work efficiency. Since the work machine controls the body or the work implement to stop with clearance when the worker or the dump truck, etc. enters the movement range of the work machine, the work machine can reduce the possibility of contacting the worker or the dump truck, etc.

Abstract: Provided is a work machine control system which enables a worker to perform a work more easily in the vicinity of a work machine executing a task automatically. A work machine control system comprises: a work machine that executes a task automatically as a work to be executed; and a task control device for controlling execution of the task. The work machine comprises a vehicle body control device and a hydraulic actuator used for executing the task, wherein the vehicle body control device comprises: a task content input section for receiving input of task content information; a movement control section for calculating a speed instruction of the hydraulic actuator based on the task content information; a receiving section for receiving task control information outputted from the task control device having a task control input section for receiving input of the task control information; and a task control section for controlling execution of the task based on the task control information.