Hitachi Construction Machinery Co., Ltd.

Hitachi-lg Data Storage, Inc.

Hitachi Corporation Machinery Co., Ltd.

Yutaka Watanabe

Takashi Yagyu

Hiroyuki Adachi

Hideaki Suzuki

Yasuo Tanaka

Tomohiko Yasuda

Yoshinori Furuno

Masami Ochiai

Yukihiko Sugiyama

Hiroshi Watanabe

Yasushi Tokuda

Takatoshi Ooki

Kichio Nakajima

Hidenobu Tsukada

Shohei Kamiya

Kouichi Shibata

Toshikazu Minoshima

Takashi Saegusa

Tsutomu Fujii

Kazuhiro Shibamori

Takafumi Morimoto

Akira Hashimoto

Eitaro Ito

Yuuki Gotou

Takao Kurosawa

Jun Ikeda

Keiichiro Nakamura

Yoshifumi Nabeshima

Takayoshi Murahashi

Kenichi Sagiya

Yukinobu Abe

Atsushi Tanaka

Kouta Fujieda

Kazuki Kubota

Masashi Shoji

Takashi Yoshida

Toshihiko Shimizu

Hiroyuki Awano

Hirotsugu Kasuya

Hiroshi Sazanami

Yuuki Nagaoka

A controller of a work machine includes: a service request generation unit that generates and transfers information for requesting a remote service; a service execution condition management unit that confirms and manages the condition for executing the remote service; and an operating mode management unit that manages the operating mode and the operation status of the work machine. The service request generation unit generates service request information containing function types of a plurality of remote services, the operating mode of the vehicle, and the communication performance of the communication network, and transfers it to the data center. For each function type included in the service request information, the service execution condition management unit outputs service execution information containing the execution possibility, the condition for operating mode, and the condition for communication performance.

Work machine

A work machine management device includes: a receiving unit that receives, from a work machine, sensor data indicating states of various sections of the work machine, and alarm data indicating that the work machine has determined that an abnormality has occurred in the work machine; and an operating level classifying unit that, based on the sensor data received by the receiving unit, classifies an operating state of the work machine as being any one of a plurality of predetermined operating levels.

Work machine management device

A display system for a working machine displays basic information at all times and, in case of an abnormality, displays the details of the warning in addition to the basic information to enable an operator to reliably recognize details of the warning. For example, a first warning display function, upon receiving an abnormality information signal relating to a charge warning, displays an appropriate warning icon in a warning icon display region. A simplified basic-information display function, then displays simplified basic-information images and a second warning display function displays, in a free area of the display, a second warning message inclusive of a 'Charge warning' message as display details of the warning icon, and of character information relating to a simplified remedial action. The operator can then reliably recognize the 'Charge warning' and understand its details as well, by viewing the second warning message in addition to the warning icon.

Display system for working machine

A device diagnostic apparatus () comprising: data judgment means () for, when device information () including operating condition information and internal state information is inputted, comparing the operating condition information of the device information with operating condition information stored in a database () beforehand to judge whether or not both of the operating condition information agree with each other, and then outputting judgment result information; and state diagnosis means () for, when the judgment result information indicates that both of the operating condition information agree with each other, comparing the internal state information in the device information with internal state information stored in the database beforehand, and then outputting the result of the comparison. This makes it possible to reduce the possibility that false judgment result will be output, and to achieve the efficiency of maintenance work.

Apparatus and system for diagnosing devices included in working machine

A brake system in an electric drive dump truck. The electric drive dump truck has a generatordriven by an engineand traveling motorsL,R driven with electric power generated by the generator. Hydraulic brakesL,R,L,R are operated by brake pedal. An oil pressure sensordetects hydraulic fluid pressure produced in accordance with the amount of depression of the brake pedaland a control unitcontrols the traveling motorsL,R so as to operate them as generator-type retarders when the hydraulic fluid pressure P detected by the oil pressure sensoris not smaller than a predetermined value P

Brake system in electric drive dump truck

A drive system of an electrically driven dump truck is capable of achieving an operational feeling in which the operation amount of the accelerator pedal is well balanced with the output horsepower of the electric motors, particularly at the time of slow traveling. To achieve this, the target motor output horsepower Pmcorresponding to the operation amount of an accelerator pedalis calculated. The target motor torque TrR, TrL is calculated on the basis of the target motor output horsepower Pmand the rotational speed &#x3c9;R, &#x3c9;L of electric motorsR,L respectively. The acceleration torque limit values of the electric motorsR,L corresponding to the operation amount of the accelerator pedalare calculated, respectively. Then, smaller values are selected, as motor torque instruction values TrR, TrL, between the acceleration torque limit value and the target motor torque TrR, TrL to control invertersR,L, respectively.

Drive system for electrically driven dump truck

Engine driving characteristics are achieved for driving a hydraulic system during non-traveling and traveling in an electrically driven dump truck. When a shift leveris located at a neutral position, the target revolution speed Nrcorresponding to the operation amount (p) of an accelerator pedalis calculated on the basis of first target revolution speed characteristics (Nr()) which are suitable for driving of a hydraulic pump for working so that an electronic governoris controlled on the basis of this target revolution speed. When the shift leveris located at a forward position, the target revolution speed Nrcorresponding to the operation amount of the accelerator pedalis calculated on the basis of second target revolution speed characteristics (Nr()) which are suitable for driving of electric motorsR,L so that the electronic governoris controlled on the basis of this target revolution speed.

In case a temperature (T) of a lubricant oil (G) cannot be detected by an oil temperature sensor () provided on an output side of a lubricant pump (), the temperature (Tm) of a wheel drive motor () is detected by using a motor temperature sensor () provided on the wheel drive motor (). By estimating the temperature (T) of the lubricant oil (G) from the temperature (Tm) of the wheel drive motor (), monitoring is carried out as to whether or not the temperature (Tm) has risen to a predetermined temperature (Tms) at which the cooling of the lubricant oil (G) by forced circulation is deemed necessary. The drive of a lubricant pump () by a pump drive motor () is stopped until the motor temperature (Tm) rises to a level exceeding the predetermined temperature (Tms).

Travel drive apparatus for a working vehicle

A swing drive system for a construction machine enhances safety for an operator. A swing control meansA has a lever input amount-torque tableand an actual rotating speed-torque table. Based on a lever input amount and an actual rotating speed of an electric motor, the tables are used to derive torque values. A minimum value of the torque values is taken as the acceleration torque. The swing control meansA further has a lever input amount-meter-out restriction area tableand an actual rotating speed-relief torque table. Based on the lever input amount and the actual rotating speed of the electric motor, a meter-out restriction area is derived from the lever input amount-meter-out restriction area table and the actual rotating speed to calculate a meter-out torque. A minimum value of the meter-out torque and relief torque is taken as the braking torque.

Swing drive system for construction machine

A drive system for an electrically driven dump truck is capable of enabling electric motors for traveling to make full use of the output horsepower of the prime mover up to an output limit of the prime mover. A target motor horsepower corresponding to an operation amount of an accelerator pedal is calculated and an available maximum horsepower for the electric motors out of the maximum output horsepower of the prime mover is calculated in response to the actual revolution speed of the prime mover. The horsepower coefficient corresponding to the instantaneous revolution speed deviation is calculated. The available maximum horsepower for the electric motors is modified by the horsepower coefficient to determine a second target motor horsepower. The target motor horsepower is limited to not exceed the second target motor horsepower so as to control the torque of the electric motors.

An object of the invention is to provide a disc autochanger without any disc reversing mechanism by using on A-side recording and reproducing apparatus and a B-side recording and reproducing apparatus while using a sheet-like optical disc in which both surfaces can be recorded and reproduced. The disc autochanger is constituted by a cartridge storing a plurality of sheet-like optical discs in which both surfaces are recorded and reproduced in a state of putting in a tray, the A-side recording and reproducing apparatus in which a moving table of an A-side recording and reproducing portion is arranged in an upper side of a tray take-out mechanism and a moving table of a cap is provided in a lower side thereof, and the B-side recording and reproducing apparatus in which a moving table of a B-side recording and reproducing portion is arranged in a lower side of the tray take-out mechanism and a moving table of a cap is provided in an upper side thereof. Accordingly, since it is possible to alternately supply the sheet-like optical discs in which both surfaces are recorded and reproduced to the A-side and B-side recording and reproducing apparatuses from the cartridge, it is possible to record and reproduce continuously and in parallel.

Optical disc recording and reproducing apparatus and disc autochanger

Graphic user interface for display for construction machine

The invention is intended to provide a downhill speed control system which employs a method of setting a target vehicle speed in advance, thereby improving controllability when a vehicle runs down a slope, and giving an operator improved operability in setting of the target vehicle speed. Brakes are controlled so that, when the vehicle runs down the slope, an actual vehicle speed is matched with a target speed set by a switch which can set the target speed by selectively or continuously changing plural preset speeds. Also, control constants for PID control are modified depending on settings of a downslope gradient setting switch and a load setting switch. When an acceleration computed from the actual vehicle speed is larger than a target acceleration, the strength of applied brake is increased.

Downhill speed controller

Fault diagnosis of hydraulic pumps is made automatically during an actual operation of a working machine, particularly when there is a problem with horsepower limiting control of the hydraulic pumps. A controller performs horsepower limiting control for a plurality of variable displacement hydraulic pumps to . The controller measures a pump delivery pressure and pump delivery rate of each hydraulic pump when the pump delivery rate reaches a maximum during operation of the hydraulic drive system based on their detected values, collects the measured values as fault diagnostic data, and then compares a calculated target pump delivery rate with the collected pump delivery rate to decide if there is a fault of the hydraulic pump.

Pump trouble diagnosing device for hydraulic drive device and display device of the diagnosing device

Measurement and display of load of excavating blasted ground

Growing community of inventors

Tsuchiura, Japan

Yutaka Watanabe