Komatsu Corporation

Mitsuhiko Kamado

Tomohiro Nakagawa

Shigeru Yamamoto

Kouji Ohhigashi

Kazuhiko Hayashi

Shinji Mitsuta

Noboru Kanayama

Takao Suehiro

Hayato Hisa

Toru Obara

Akihiro Kageyama

Kouichi Miyatake

Shinya Arimatsu

Akinori Sugiura

Takashi Sugiguchi

Yuki Sugimura

Kouji Okazawa

Takashi Sawaki

A first process acquires a true value of the position of a predetermined portion. A second process acquires a reference position of a work machine. A third process determines a plurality of correction candidate values of a parameter. The correction candidate values are used so that a calculation value of the position of the predetermined portion calculated based on the parameter from the reference position matches the true value. A fourth process calculates an assessment value indicative of the difference between the true value and a calculation value for each of plurality of correction candidate values. A fifth process determines a confirmation correction value of the parameter from among the plurality of correction candidate values based on the assessment value.

Method and system for calibrating work machine

A display system includes a display and a controller. The controller causes the display to display a third figure representing a relative relationship between a first figure indicating a direction of a working implement of a working machine and a second figure indicating a direction of a target topography from the working machine.

Display system, program, and method for controlling display system for displaying an inclination of an excavation tool

A working vehicle includes a revolving pump output calculating section that calculates the revolving pump output where the output of an electric motor is converted to be the output of a hydraulic pump. A reduction amount determining section determines a reduction amount for the output of the hydraulic pump during the multiple operations based on the revolving pump output. A pump output determining section determines a value, where the reduction amount is subtracted from the output of the hydraulic pump which is determined according to the state with the multiple operations, in a first control mode as the output of the hydraulic pump during the multiple operations. The pump output determining section increases the output of the hydraulic pump during the multiple operations in a second control mode more than in the first control mode.

Working vehicle and working vehicle control method

A control system for a work vehicle includes a temperature detecting unit and a controller. The temperature detecting unit detects the temperature of the electrical drive system. The controller controls the output of an electric motor when the temperature of the electrical drive system detected by the temperature detecting unit exceeds a predetermined first threshold and an operating member of the movable body is positioned in a neutral position. The controller does not limit the output of the electric motor when the operating member for the movable body is being operated even when the temperature of the electrical drive system exceeds the first threshold.

Control system for work vehicle, control method, and work vehicle

In a hydraulic excavator, a controller is configured to control output of an engine based on a first engine output torque line that defines an upper limit for engine output torque against engine rotation rate. The controller is configured to determine which of two operations, a high hydraulic load operation in which a work machine is subjected to a high hydraulic load and a low hydraulic load operation in which the work machine is subjected to a low hydraulic load, is being performed. When swinging for a revolving unit and the low hydraulic load operation for the work machine are being performed as a combined operation, the controller is configured to control the output of the engine based on a second engine output torque line. The second engine output torque line is an engine output torque line with a lower engine output torque than the first engine output torque line.

Hydraulic excavator and hydraulic excavator control method

A bulldozer of the present invention includes a GPS receiver which is fixed to a vehicle body of the bulldozer, and angle obtaining part which stores a conversion table in which a combination of an angling cylinder length and a tilt cylinder length are matched with a combination of a blade angling angle and a blade tilting angle.

Construction machine

A control unit is configured to calculate a target absorption torque of a hydraulic pump at which the engine output torque and the absorption torque of the hydraulic pump match a target matching rotation speed of the engine. The control unit is configured to refer to command data, calculate a command current value corresponding to the target absorption torque, and output a command signal of the calculated value to a pump control device. The control unit is configured to calculate the absorption torque at calibration points at which there is an equilibrium state in which the output horsepower of the engine and the absorption horsepower of the hydraulic pump are matched. The control unit is configured to acquire calibration information including the calculated absorption torque and the command current value output to the pump control device in the equilibrium state, and calibrate the command data based on the calibration information.

Work vehicle and work vehicle control method

A device for a work vehicle eliminates uncomfortable operation feeling, improves the working efficiency, and reduces thermal load on a clutch and transmission shock. It is determined whether the current travel direction of the vehicle body is a forward travel direction F or a reverse travel direction R based clutch oil pressure of the forward clutch or reverse clutch. Braking force of a brake device is controlled such that the brake device is activated on the conditions that the travel direction position selected by the travel operation lever and the travel direction determined by a travel direction flag are opposite to each other, and the detected vehicle body speed is equal to or greater than a predetermined threshold value.

Work vehicle controller

An invention relating to a control apparatus and a control method for a hydraulically driven cooling fan for reducing the peak pressure produced upon reversing the switch position of a switching valve, without stopping an engine, and without greatly modifying existing hydraulic circuitry or increasing the apparatus cost. In the invention, in the case that a reversing switch has been operated so as to output a reversal processing commencement instruction signal, control is carried out such that, under the condition that the rotational speed of the engine has decreased to not more than a stipulated rotational speed, capacity adjusting means is controlled, so as to reduce the capacity of a hydraulic pump, and thus reduce the fan rotational speed, and then the switch position of the switching valve is reversed.

Control apparatus and control method for hydraulically driven cooling fan

An engine control apparatus for a work vehicle having a cooling fan or an auxiliary device driven by an engine. The engine control apparatus is capable of operating the work vehicle with the importance placed either on amount of work or fuel economy depending on the situation, and preventing the input of excessive traveling horsepower (or working horsepower), regardless of a selected work mode, to ensure durability of the traveling power train (or work machine drive equipment). Upon selection of a work mode by the work mode selection switch, a controller controls the engine to obtain a power curve selected from those selectable for the selected work mode can be obtained, based on the coolant temperature range and the selected work mode, so that the input torque transmitted to the traveling power train does not surpass the upper limit for the input torque (rated output).

Engine control device of work vehicle

A cooling system for use in a work machine is provided, in which an increase in the load imposed on a fan driving circuit and occurrence of abnormal noise can be prevented without fail by means of an inexpensive arrangement at the time of switching the rotating direction of a cooling fan. To this end, the cooling system comprises: (1) a variable displacement hydraulic pump driven by the engine; (2) a forwardly and reversely rotatable hydraulic motor operated by hydraulic oil supplied from the hydraulic pump; (3) a cooling fan driven by the hydraulic motor; (4) an electromagnetic selector valve for switching the rotating direction of the hydraulic motor between a forward direction and a reverse direction; (5) controlling means for controlling switching of the electromagnetic selector valve and controlling the hydraulic pump so as to minimize the discharge oil rate of the hydraulic pump during switching of the electromagnetic selector valve.

Cooling system for work machine

A supporting structure for an operator cab on a body frame of a work machine having a floor frame with a low floor portion and a high floor portion. A vibro-isolating support provided between the low and high floor portions so as to support the operator cab resiliently. At least one of said vibro-isolating supports located at either of the low floor portion having a support axis (M&mdash;M) or the high floor portion a having support axis (N&mdash;N) inclines longitudinally at a predetermined angle (&thgr;) from a vertical axis toward the center of gravity (G) of the operator cab. Either one of the vibro-isolating supports is located at the low floor portion and the high floor portion having a vertical support axis.

Growing community of inventors

Hirakata, Japan

Mitsuhiko Kamado