Komatsu Corporation

Hisashi Asada

Teruo Akiyama

Takeshi Ooi

Shuuji Hori

Masashi Ichihara

Dai Tsubone

Kenji Doishita

Tetsuya Akiyama

Ryomei Kurokawa

Naoki Ishizaki

Sadao Nunotani

Jin Kitajima

Kazuhiro Maruta

Takashi Kurihara

Daisuke Kozuka

Ryo Fukano

Nobuhisa Honda

Kazunori Ikei

Norihide Mizoguchi

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.

System for managing mining machinery, method for managing mining machinery, and dump truck

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.

System for managing mining machine and method for managing mining machine

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.

Engine control device

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.

Swing drive controlling system for construction machine

A first target engine speed Nand a high-speed control area Fare set according to a command value commanded by a command unit. A second target engine speed Nand a high-speed control area Fdefined on a low-speed side are set according to the first target engine speed N. 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 F. The drive of the engine is controlled so that the engine is driven at the target engine speed N.

Engine control device and engine control method

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&#xb0;.

Hydraulic shovel operability range display device and method for controlling same

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.

Engine control device, and its control method

A travel vibration suppressing deviceis structured such that a directional control valvefor a bucket, a directional control valvefor a boom, a ride control valveand a boom speed increasing valveare integrally arranged in a laminated manner by an internal piping. The ride control valvecommunicates or cuts off a bottom chamberof a boom cylinderand an accumulator. The boom speed increasing valvesupplies a discharge pressure of a hydraulic pumpto the bottom chamberor a head chamberor connects the to the bottom chamberor the head chamberto a tank

Travel vibration suppressing device for working vehicle

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 valverapidly increases, and the differential pressure (Pp'-PL) across the steering flow control valverapidly decreases. When the differential pressure (Pp&#x2032;-PL) across the steering flow control valverapidly decreases, a flow control valveis biased by the spring force of a springand quickly moves to the side of a valve positionto increase the differential pressure (Pp&#x2032;-PL) and make it correspond to a set pressure. Thus, the pressure oil of a surplus flow &#x3b1;, which up to this point has been flowing to a discharge oil line, is quickly supplied from the flow control valveto a steering hydraulic cylindervia the steering flow control valve. Thus, an output Q&#x2032; starts quickly relative to an input St.

Growing community of inventors

Yokohama, Japan

Hisashi Asada