Hitachi Construction Machinery Co., Ltd.

Zexel Gmbh

Kayaba Industry Company, Ltd.

Hitachi Construction Machinery

Hitachi Construction Co., Ltd.

Toichi Hirata

Genroku Sugiyama

Hiroshi Watanabe

Hiroyuki Adachi

Tsukasa Toyooka

Hideaki Tanaka

Kazunori Nakamura

Yusuke Kajita

Koichi Shibata

Kouji Ishikawa

Tsuyoshi Nakamura

Masakazu Haga

Hideki Komatsu

Osamu Tomikawa

Hiroshi Onoue

Eiki Izumi

Yusaku Nozawa

Tsuyoshi Sakyo

Youichi Kowatari

Shigehiro Yoshinaga

Masami Ochiai

Akira Tatsumi

Kazuhisa Tamura

Kazuo Fujishima

Yoichi Kowatari

Ei Takahashi

Hideo Karasawa

Tadatoshi Shimamura

Takashi Nakagawa

Yasuo Tanaka

Kazuhiko Hiraoka

Akitaka Takeuchi

Gen Yasuda

Yukio Aoyagi

Yoshinori Furuno

Kuniaki Yoshida

Shinichi Satoh

Koji Ishikawa

Shuichi Miura

Kazuhiro Sunamura

Kiyoshi Ono

Yoshiaki Saito

Koji Mitsuya

Atsushi Sato

Jun Sonoda

Eiji Yamagata

Hidefumi Takegahara

Kazuhiko Nishiyama

Kazuhiro Shibamori

Yasushi Arai

Seiji Tamura

Hideshi Koiwai

Kentaro Itoga

Shingo Hirose

Toshinori Kimura

Shigetaka Nakamura

Masaki Egashira

Nobuya Okabe

Yoshiki Yoshida

Hitoshi Kagiwada

Rindo Morikawa

Ichiro Hirami

Toshimichi Ikeda

Koji Tahara

Kazumasa Yuasa

Tomohiko Yasuoka

Yoneaki Takahashi

Yasushi Ochiai

Shinichi Mihara

Masaki Kanahara

Masao Kashiwagi

Masao Nishimura

Kiyoshi Oyama

Itsuo Kondo

Yuji Nagashima

Shigetoshi Konno

Yasushi Konomura

Yasuharu Gotou

Ikuo Inagaki

Norio Onuma

Masahiko Shimotori

Tomohiko Yasudi

Gen Tsukuba-Ryo 4-1 Yasuda

Tsuyoshi Hitachi Kenki Tsukubaryo Nakamura

Masao Hitachi Kenki Tsukubaryo Nishimura

A traveling hydraulic working machine has a target revolution speed of an engine commanded by an input and sensors for detecting an operating situation of a hydraulic actuator and an operating situation of a traveling system. A prime-mover revolution speed control modifies the target revolution speed of the prime mover when the operating situation of the hydraulic actuator and the operating situation of the traveling system come into respective particular states, and controls the revolution speed of the prime mover, With the traveling hydraulic working machine, in the combined operation of traveling and working a hydraulic actuator, work can be performed on the basis of the engine revolution speed intended by an operator. When a working load varies, the engine revolution speed is automatically controlled.

Traveling hydraulic working machine

Assessment information needed to calculate a used vehicle assessment value of a hydraulic excavatoris input to a portable telephoneand is then transmitted from the portable telephone. The transmitted assessment information is received at a manufacturer's base stationat a remote location. The used vehicle assessment value of the hydraulic excavatoris calculated based upon the received assessment information, and history information and operation information on the hydraulic excavatorread out from an operation information databaseand a history databasein correspondence to an ID number assigned to the hydraulic excavator which is included in the assessment information.

Construction machine management apparatus and construction machines management system

A modification torque &#x394;T and a torque converter speed ratio e is computed from input and output revolution speeds of a torque converter. A first determination coefficient &#x3b1; corresponding to the speed ratio e, and a second determination coefficient &#x3b2; corresponding to a pump pressure are computed. A selectorselects the smaller one of these coefficients as a determination coefficient &#x3b3;, and the modification torque &#x394;T is multiplied by &#x3b3; to provide a modification torque &#x394;TA. An adderadds the modification torque &#x394;TA (negative value) to a pump base torque TR to provide a modified pump base torque TRA, whereby a maximum pump absorption torque TRA is controlled so as to become TRA. The maximum pump torque reducing control can then be performed while accurately confirming a work situation during the combined operation of travel and a working actuator.

Provided is a communication system for working machines, which makes it possible to transmit desired messages from sites, where the working machines are arranged, to their corresponding work administration centers at timings as needed. When a mail switcharranged on a working machineis operated to send information to a server, a terminal user-company identification unitidentifies, on the basis of a terminal information database, a user to which the information so received is to be sent. A user-company-dependent mail selection unitselects customer informationon the user from a customer database. At a transmission mail creation unit, a corresponding new messageis created. The mail is then transmitted from a mail output unit. In this manner, a desired message can be sent from each working machineat a remote location to the corresponding user at a timing as needed.

Communication system for working machines

A hydraulic drive unit is provided with a boom cylinder, an arm cylinder, a communication line communicating a rod chamber of the boom cylinder and a bottom chamber of the arm cylinder with each other, and a switching valve arranged on the communication line for communicating or shutting off the communication line in accordance with a rod pressure of the boom cylinder. When an arm-crowding single operation is performed and by its digging counterforce, a rod pressure of the boom cylinder rises to a high pressure of at least a predetermined pressure, the switching valve is changed over from a shut-off position to a communicating position to feed pressure oil from the rod chamber to the bottom chamber. The boom cylinder is hence caused to automatically extend, thereby avoiding lifting of a hydraulic excavator body.

Hydraulic drive unit

The present invention is applied to a system comprised of large number of hydraulic excavatorsdeployed at construction sites and a base stationEach hydraulic excavatoris provided with a storage unit (memory), a control unit (CPU) for executing the work operation and receiving as input a quantitative machine status relating to the work operation, and a communications deviceThe base stationis provided with a communications devicea management serverfor identifying the serial number of the hydraulic excavatorand transferring information, and a databasefor storing various information. The control unit of the hydraulic excavatorand the management serverof the base stationtransfer information. With this system configuration, the control unit measures the duration during which the quantitative machine status satisfies a predetermined condition and stores it in the storage unit and transmits the measurement data of the duration to the management serverof the base stationconditional on the power input key being in the off position, while the management serverreceives the measurement data of the duration and calculates the cumulative operating time. Further, the quantitative machine status and various event data stored in the storage unit of the hydraulic excavatorare sent to the base stationwhile the management server of the base stationstores the quantitative machine status and various event data in the databaseby a predetermined format.

Method of detection of actual operating time of machinery deployed at construction sites, data collection and management system, and base station

A machine body controllerA includes a modification control unitAb for computing a torque modification value based on detected signals from environment sensorstoand modifies a maximum absorption torque of a hydraulic pump controlled by a basic control unitAa. An engine controllerB includes a modification control unitBb for computing an injection modification value based on detected the signals from the environment sensorstoand modifies a fuel injection state of a fuel injection devicecontrolled by a basic control unitBa. The controllersA,B further include computation element altering unitsA communication controllerC downloads alteration data obtained from an external terminalto the computation element altering unitswhereby corresponding computation elements contained in the modification control unitsAb,Bb are altered. As a result, it is possible in any environments to approprately modify the maximum absorption torque of the hydraulic pump and the fuel injection state of the injection device, and to sufficiently develop the performance of a construction machine.

Signal processing system for construction machine

A construction machine comprises a location detector for detecting location information for the construction machine, a determination device for determining whether or not location information is to be transmitted and outputting a transmission signal if it is determined that information is to be transmitted, and a transmitter for transmitting the detected location information to a base station in response to the transmission signal.

Construction machine management system, and construction machine

A security system of a construction machine of the present invention has a construction machine, a base station and a communication device. The construction machine comprises a data sending and receiving portion for sending first information, a storage portion for storing received information, and a control portion for controlling an operation of the construction machine. The base station receives the first information from the data sending and receiving portion of the construction machine and sends second information to the construction machine and manages the construction machine. It is configured so that the communication device is connected to the base station through a communication network and can send third information to the construction machine through the base station.

Security system of construction machine

A security system for a construction machine including a construction machine equipped with a body controller for storing a first password, management apparatus arranged in a location apart from the construction machine and a portable communications unit for storing a second password provided communicably with the management apparatus and the body controller. The portable communications unit, receiving the first password from the management apparatus, replaces the second password with the first password. The body controller determines whether the second password output from the portable communications unit coincides with the first password. In case these passwords coincide with each other, an engine drive signal is output. Otherwise the engine is kept inoperable. This prevents possible theft of a construction machine.

Security system of construction machinery

A method and system for managing a construction machine whereby working time for each of different parts of a hydraulic excavator is measured. Measured data is stored in a memory of a controller and then transferred to a base station computer via satellite communication to be stored in a database. At each repair/replacement of a part in each hydraulic excavator, the base station computer calculates, based on the operation data, a replacement time interval of the part on the basis of the working time per section to which the part belongs, and then stores and accumulates it. The base station computer also reads the stored data for each hydraulic excavator, determines, for each part, a replacement rate of the part having a substantially equal replacement time interval, and calculates a target replacement time interval of the part in accordance with the replacement time interval corresponding to a maximum replacement rate.

Method and system for managing construction machine, and arithmetic processing apparatus

A function changing system of construction machinery includes a hydraulic excavator and a base station. The hydraulic excavator is deployed at a construction site and is provided with a rewritable memory storing control programs and/or data required for control of the machinery, a CPU for reading out the control programs from the memory and executing them, and a communications device The base station is provided with a communications device, a center server for identifying the serial number of the hydraulic excavator and transferring information with the control unit, and a database managed by the center server and storing control programs corresponding to the hydraulic excavator. When changing or switching an attachment of the hydraulic excavator, information is transferred with the center server of the base station and the control programs or data stored in the storage unit are rewritten to enable work suited to the changed part.

System for changing function of work machine and base station

A hydraulic excavator working in fields includes a controller for measuring a working time for each of an engine , a front , a swing body , and a travel body , storing measured data in a memory of the controller , and then transferring it to a base station computer via satellite communication, an FD, etc. The transferred data is stored as a database in the base station computer . The base station computer reads the data stored in the database for each hydraulic excavator, calculates a working time of a part belonging to each section on the basis of the working time of that section, and compares the calculated working time with a preset target replacement time interval of the relevant part, thereby calculating a remaining time up to next replacement of the relevant part and managing the scheduled replacement timing thereof. Thus, the appropriate scheduled replacement timing of parts can be determined even in a construction machine having a plurality of sections that differ in working time from each other.

Method for managing construction machine, and arithmetic processing apparatus

A method and system for managing a construction machine and processing apparatus therefor includes a controller mounted on a hydraulic excavator working in fields. An operating time for each of an engine , a front , a swing body and a travel body is measured and stored in a memory of the controller . The measured data is transferred to a base station computer and stored in a database inside the base station computer . The base station computer reads, per hydraulic excavator, the data stored in the database and then prepares and outputs a distribution graph of the number of operated machines with respect to the working time (engine running time) of the hydraulic excavator. While looking at the distribution graph, a machine maker estimates the number of hydraulic excavators to be renewed and estimates the sales quantity of hydraulic excavators, thereby setting up a production plan of hydraulic excavators.

Construction machine managing method and system, and arithmetic processing device

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Ushiku, Japan

Toichi Hirata