Abstract: An evaluation device includes a detection data acquisition unit that acquires detection data including a detected movement trajectory of a predetermined portion of a working unit of a working vehicle based on operation data of the working unit from a movement starting position to a movement ending position, detected by a detection device that detects an operation of the working unit, a target data generation unit that generates target data including a target movement trajectory of the predetermined portion of the working unit, and an evaluation data generation unit that generates evaluation data of an operator who operates the working unit based on the detection data and the target data.

Abstract: A management system for a mining machine on which tires are mounted and which travels in a mine by operation performed by a driver includes: a determination unit configured to determine whether or not a damaging operation damaging the tires has been carried out; a data acquisition unit configured to acquire damaging operation data indicating carrying out of the damaging operation, and one or both of driver identification data indicating a driver who has carried out the damaging operation and position data indicating a position of the mining machine on which the damaging operation has been carried out; and a data output unit configured to output association data containing the damaging operation data associated with one or both of the driver identification data and the position data.

Abstract: A system for managing a mining machine is included in a mining machine that travels in a mine. The system includes: a positional information detecting unit configured to acquire positional information indicating a position of the mining machine; and a traveling path calculating unit configured to obtain, from each of a plurality of the mining machines, positional information about an actual traveling path on which each of the mining machines actually has traveled, and generate a reference traveling path in the mine with the obtained positional information.

Abstract: A system for managing a mining machine is included in a mining machine that travels in a mine. The system includes: a positional information detecting unit configured to acquire positional information indicating a position of the mining machine; and a traveling path calculating unit configured to obtain, from each of a plurality of the mining machines, positional information about an actual traveling path on which each of the mining machines actually has traveled, and generate a reference traveling path in the mine with the obtained positional information.

Abstract: A management system for a mining machine on which tires are mounted and which travels in a mine by operation performed by a driver includes: a determination unit configured to determine whether or not a damaging operation damaging the tires has been carried out; a data acquisition unit configured to acquire damaging operation data indicating carrying out of the damaging operation, and one or both of driver identification data indicating a driver who has carried out the damaging operation and position data indicating a position of the mining machine on which the damaging operation has been carried out; and a data output unit configured to output association data containing the damaging operation data associated with one or both of the driver identification data and the position data.

Abstract: A first target engine speed is set in response to a command value commanded by a command unit. A second target engine speed equal to or lower than the first target engine speed is set based on the first target engine speed. When the first target engine speed is reduced, the second target engine speed is set to be constant or be decreased and a reduction range for decreasing the first target engine speed to the second target engine speed is set to be decreased. The reduction range is set at zero when the first target engine speed is equal to or lower than an engine speed at least at a maximum torque point.

Abstract: The system includes: a variable displacement hydraulic pump supplying pressure oil to a hydraulic actuator; a pressure detector detecting a pump discharge pressure from the hydraulic pump; a control valve controlling a supply of the pressure oil to the hydraulic actuator; a controller controlling a pump displacement of the hydraulic pump; a hydraulic motor rotating an upper structure of the construction machine; a swing relief valve defining a relief pressure of the hydraulic motor; and a control lever switching a control valve for the hydraulic motor. The controller includes: an adjuster that, when a pump discharge pressure detected by the pressure detector exceeds a first set value, conducts an adjustment to reduce the pump displacement; and a canceller that cancels the adjustment when the pump discharge pressure falls below a second set value. The second set value is equal to or larger than the first set value.

Abstract: A first target engine speed N1 and a high-speed control area F1 are set according to a command value commanded by a command unit. A second target engine speed N2 and a high-speed control area F2 defined on a low-speed side are set according to the first target engine speed N1. A pump displacement D and an engine torque T of a variable displacement hydraulic pump are detected so that a target engine speed N corresponding to each of the detected pump displacement and engine torque is detected according to a preset relationship between a the pump displacement D and the target engine speed N and a preset relationship between the engine torque T and the target engine speed N during an engine control at the high-speed control area F2. The drive of the engine is controlled so that the engine is driven at the target engine speed N.

Abstract: In a hydraulic shovel operability range display device, a calculation unit is configured to set a boundary between an operability range and an underbody area along a vertical direction in a global coordinate system when a vehicle body is horizontally oriented. When the vehicle body is tilted forward, the calculation unit is configured to set the boundary so as to be maintained along the vertical direction in the global coordinate system. When the vehicle body is tilted backwards, the calculation unit is configured to correct the boundary between the operability range and the underbody area so that an angle formed by the boundary and the ground surface on which the vehicle body is positioned is at least 90°.

Abstract: An engine control device includes an engine-driven variable displacement hydraulic pump, a hydraulic actuator driven by oil from the pump, a control valve which controls the oil discharged from the pump, and supplies the oil to and from the hydraulic actuator, pump displacement detecting means, command means for selecting and commanding variable command values, and setting means for setting a first target engine speed in accordance with a command value, and a second target engine speed lower than the first target engine speed based on the first target engine speed. When the pump displacement increases and exceeds a first predetermined pump displacement when the engine is controlled based on the second target engine speed, a target engine speed is changed from the second target engine speed to a third target engine speed higher than the second target engine speed and equal to or lower than the first target engine speed.

Abstract: In a hydraulic shovel operability range display device, a calculation unit is configured to set a boundary between an operability range and an underbody area along a vertical direction in a global coordinate system when a vehicle body is horizontally oriented. When the vehicle body is tilted forward, the calculation unit is configured to set the boundary so as to be maintained along the vertical direction in the global coordinate system. When the vehicle body is tilted backwards, the calculation unit is configured to correct the boundary between the operability range and the underbody area so that an angle formed by the boundary and the ground surface on which the vehicle body is positioned is at least 90°.

Abstract: A first target engine speed is set in response to a command value commanded by a command unit. A second target engine speed equal to or lower than the first target engine speed is set based on the first target engine speed. When the first target engine speed is reduced, the second target engine speed is set to be constant or be decreased and a reduction range for decreasing the first target engine speed to the second target engine speed is set to be decreased. The reduction range is set at zero when the first target engine speed is equal to or lower than an engine speed at least at a maximum torque point.

Abstract: The system includes: a variable displacement hydraulic pump supplying pressure oil to a hydraulic actuator; a pressure detector detecting a pump discharge pressure from the hydraulic pump; a control valve controlling a supply of the pressure oil to the hydraulic actuator; a controller controlling a pump displacement of the hydraulic pump; a hydraulic motor rotating an upper structure of the construction machine; a swing relief valve defining a relief pressure of the hydraulic motor; and a control lever switching a control valve for the hydraulic motor. The controller includes: an adjuster that, when a pump discharge pressure detected by the pressure detector exceeds a first set value, conducts an adjustment to reduce the pump displacement; and a canceller that cancels the adjustment when the pump discharge pressure falls below a second set value. The second set value is equal to or larger than the first set value.

Abstract: A first target engine speed N1 and a high-speed control area F1 are set according to a command value commanded by a command unit. A second target engine speed N2 and a high-speed control area F2 defined on a low-speed side are set according to the first target engine speed N1. A pump displacement D and an engine torque T of a variable displacement hydraulic pump are detected so that a target engine speed N corresponding to each of the detected pump displacement and engine torque is detected according to a preset relationship between a the pump displacement D and the target engine speed N and a preset relationship between the engine torque T and the target engine speed N during an engine control at the high-speed control area F2. The drive of the engine is controlled so that the engine is driven at the target engine speed N.

Abstract: A first target engine speed Nh and a high-speed control field F1 are set in accordance with a command value by command means. A second target engine speed N2 on the low rotation side and a high-speed control field F2 are set based on the first target engine speed Nh. When a matching point between an engine load and an engine output torque exceeds a first set position A which is a first predetermined pump displacement during control of an engine in the high-speed control field F2, the high-speed control field F2 is shifted toward the high-speed control field F1.

Abstract: A travel vibration suppressing device 20 is structured such that a directional control valve 30 for a bucket, a directional control valve 29 for a boom, a ride control valve 31 and a boom speed increasing valve 33 are integrally arranged in a laminated manner by an internal piping. The ride control valve 31 communicates or cuts off a bottom chamber 11a of a boom cylinder 11 and an accumulator 27. The boom speed increasing valve 33 supplies a discharge pressure of a hydraulic pump 21 to the bottom chamber 11a or a head chamber 11b or connects the to the bottom chamber 11a or the head chamber 11b to a tank 23.

Abstract: A travel vibration suppressing device 20 is structured such that a directional control valve 30 for a bucket, a directional control valve 29 for a boom, a ride control valve 31 and a boom speed increasing valve 33 are integrally arranged in a laminated manner by an internal piping. The ride control valve 31 communicates or cuts off a bottom chamber 11a of a boom cylinder 11 and an accumulator 27. The boom speed increasing valve 33 supplies a discharge pressure of a hydraulic pump 21 to the bottom chamber 11a or a head chamber 11b or connects the to the bottom chamber 11a or the head chamber 11b to a tank 23.

Abstract: The present invention lowers energy loss while at the same time enhancing the responsiveness of a steering control system. When a steering controller is operated rapidly, the aperture area of a steering flow control valve 4 rapidly increases, and the differential pressure (Pp?-PL) across the steering flow control valve 4 rapidly decreases. When the differential pressure (Pp?-PL) across the steering flow control valve 4 rapidly decreases, a flow control valve 6 is biased by the spring force of a spring 6f and quickly moves to the side of a valve position 6b to increase the differential pressure (Pp?-PL) and make it correspond to a set pressure. Thus, the pressure oil of a surplus flow ?, which up to this point has been flowing to a discharge oil line 7, is quickly supplied from the flow control valve 6 to a steering hydraulic cylinder 5 via the steering flow control valve 4. Thus, an output Q? starts quickly relative to an input St.

Abstract: The present invention lowers energy loss while at the same time enhancing the responsiveness of a steering control system. When a steering controller is operated rapidly, the aperture area of a steering flow control valve 4 rapidly increases, and the differential pressure (Pp?-PL) across the steering flow control valve 4 rapidly decreases. When the differential pressure (Pp?-PL) across the steering flow control valve 4 rapidly decreases, a flow control valve 6 is biased by the spring force of a spring 6f and quickly moves to the side of a valve position 6b to increase the differential pressure (Pp?-PL) and make it correspond to a set pressure. Thus, the pressure oil of a surplus flow ?, which up to this point has been flowing to a discharge oil line 7, is quickly supplied from the flow control valve 6 to a steering hydraulic cylinder 5 via the steering flow control valve 4. Thus, an output Q? starts quickly relative to an input St.