Hitachi Construction Machinery Co., Ltd.

Kazuo Fujishima

Hiroshi Watanabe

Masakazu Haga

Masatoshi Hoshino

Hiroshi Ogura

Hiroyuki Adachi

Toichi Hirata

Hidetoshi Satake

Seiji Ishida

Shinji Ishihara

Yusuke Kajita

Hideto Ishibashi

Takashi Nakagawa

Sadahisa Tomita

Eiji Yamagata

Shinya Imura

Seiji Hijikata

Akinori Ishii

Kunitsugu Tomita

Eiji Egawa

Mitsuo Sonoda

Shiho Izumi

Manabu Edamura

Kohei Sakurai

Kotaro Shimamura

Shiro Yamaoka

Takatoshi Ooki

Takashi Okada

Masataka Sasaki

Tsutomu Udagawa

Tsuyoshi Inoue

Satoshi Inose

Takami Kusaki

Akira Nakayama

Yuichi Kunitomo

Tooru Kurenuma

Yasuo Hayakawa

Koji Ishikawa

Tomohiro Yoshida

Junji Yamamoto

Katsumi Miyaki

Sakae Takeda

Shuji Ohira

Masutaka Kumasaka

Tosio Nonaka

He Bao

An inspection support system for a construction machine including a cameraand a display (monitor)and acquiring image data of the construction machine provided in an inspection report includes a guidance display sectionthat displays a guidance image on the display, the guidance image showing a composition of a photographing object photographed as the image data, a photographing sectionthat acquires a photographic subject image photographed by the cameraas image data, and a transmitting section that transmits the image data acquired to a management serverthat manages the inspection report.

Inspection support system for construction machine, management server, and inspection report creation system

To provide construction machinery capable of more efficiently utilizing the energy of return hydraulic oil from a hydraulic actuator. The present invention is provided with: an engine; a hydraulic pumpthat is driven by the engine; a hydraulic actuatorthat is driven by fluid discharged from the hydraulic pump; a discharge pressure sensorthat detects the discharge pressure from the hydraulic pump; a hydraulic regenerative motorthat is driven by the return hydraulic oil from the hydraulic actuator; a flow meterthat detects the flow rate of the return hydraulic oil; a flow dividing valvethat controls the rate of inflow to the hydraulic regenerative motor; a controllerthat controls the flow dividing valveaccording to the discharge pressure detected by the discharge pressure sensorand the flow rate detected by the flow meter; a regenerative generatorthat generates electric power by being driven by the power of the hydraulic regenerative motor; and a motor generatorthat assists drive of the engineby the electric power supplied from the regenerative generator

Construction machinery

This invention is a hydraulic work machine having an electric assist motor coupled to an engine and a hydraulic pump, in the hydraulic work machine of which, a rotational speed and torque of the engine are controlled so that an operating point of the engine moves along a predetermined route for yielding a combustion state of the engine under a transient state that the engine changes in speed and torque. A target speed and torque of the engineare set so that the rotational speed and torque of the enginewill change along a predetermined route F in a running region of the engine, respective rates of change of the target rotational speed and torque of the engineare limited, and the engineis controlled to yield the target engine speed. In addition, torque of the assist motoris controlled to yield the target torque of the engine.

Hydraulic work machine

Construction machine capable of incorporating an engine and using an external power source. The construction machine includes an electrical storage device performing a charge with the external power source, uses the electrical storage device to provide assist when the power of the engine is insufficient, uses an electrical charge in the electrical storage device systematically in accordance with work time, and efficiently uses the electrical storage device by controlling its discharge amount in accordance with load status. The construction machine includes the engine, accessory loads connected to the engine, an assist electric motor driven by the engine, electrical power converters for converting an AC current, which is the output current of the assist electric motor, to a DC current, and the electrical storage device connected to the DC side of each electrical power converter. The electrical storage device becomes charged through a charging device from the external power source.

Construction machine

A hydraulic working machine has an assist electric motor connected to an engine and a hydraulic pump. The emissions of air pollutants in the exhaust gas from the engine are minimized regardless of fluctuations in the load torque of the hydraulic pump. A specific revolution speed suitable for reducing the emissions of air pollutants is stored, and an engine is controlled using the specific revolution speed as a target revolution speed. The absorption torque of a hydraulic pump is subjected to high-pass filtering whereby a high-frequency component devoid of a trend component is obtained. Target assist torque is computed from the high-frequency component, and the assist electric motor is subjected to power running/generation control accordingly. A specific output torque range suitable for reducing the emissions of air pollutants is stored, and the target assist torque is corrected so that the trend component does not exceed the specific output torque range.

Hydraulic working machine

A power regeneration device for an operating machine has a hydraulic cylinder and a return line through which fluid returning to a tank flows when the hydraulic cylinder contracts. The return line branches into a plurality of hydraulic lines through a branching part and includes a regeneration line that which leads returning fluid to the tank via a hydraulic motor to which a generator is connected. A control valve line is connected to the branching part and leads the returning fluid to the tank via a control valve. An electricity storage device stores electric power generated by the generator, and an electric amount detector detects the electric amount of the electricity storage device. A flow rate calculator calculates the flow rate of the returning fluid flowing through the regeneration line and the flow rate of the returning fluid flowing through the control valve line depending on an electric amount signal.

Power regeneration device for operating machine

There is provided a hydraulic excavator including a hydraulic pump () driven by an engine (), a boom cylinder () driven by hydraulic fluid delivered from the hydraulic pump (), a swing motor () driven electrically, an operating device (A) for operating the boom cylinder (), an operating device (B) for operating the swing motor (), and a vehicle body controller () which limits the power of the swing motor () in accordance with the operation amount of the operating device (A) when the two operating devices (A,B) are operated in combination. The power limit value of the swing motor () varies depending on the output of the engine (). This allows a good operational feeling to be retained in combined operation regardless of the operating state of the engine.

Work machine

To provide a system for controlling a construction machine, which can be implemented inexpensively, can detect a failure in any of pressure sensors, controllers, an inverter device, and an electric motor for swing, and can secure safety and required workability for an operator. Redundant hydraulic pressure sensorsprovide input to a first controllerfor calculating a swing command, and a second controllerprovided in an inverter devicefor controlling an electric motorfor swing. The second controllerdetects an abnormality in any of the hydraulic pressure sensorsand the first controllerby a process for determining the validity of a swing command signal, and allows the swing operation to continue by using a signal from the second hydraulic pressure sensorwhen determination is made based on the contents of the abnormality that the electric motorfor swing can operate normally.

System for controlling construction machine

A hybrid construction machine is provided with a variable displacement hydraulic pumpwhich supplies hydraulic oil to a hydraulic actuator, an enginewhich is provided to be able to drive and rotate the hydraulic pump, an electric motorwhich is provided to be able to drive and rotate the hydraulic pump, an engine control dial, a controllerand an operating lever. The controller changes the rotation speed of the engineto reduce fuel consumption according to power generated by the engine, and changes displacement of the hydraulic pumpbased on the rotation speed of the engine, the dial position of the engine control dialand the amount of operation on the operating lever

Hybrid construction machine

Target rotation speed setup section for setting a target engine rotation speed; load detection for detecting a hydraulic pump load; an assist output computation section for calculating an assist output to be generated by a motor generator in accordance with a rotation speed deviation &#x394;N, which is the difference between an actual and target rotation speed, or in accordance with the hydraulic pump load; an absorption torque upper limit computation section for calculating an absorption torque upper limit value of the hydraulic pump; and an operation signal generation section for generating the operation signal to be output to a pump displacement adjustment device. When the rotation speed deviation &#x394;N is equal to or more than a setting NC determined in accordance with the assist output value, the absorption torque upper limit computation section reduces the absorption torque upper limit value of the hydraulic pump from the calculated value.

Control device for hybrid construction machinery

A motive power regeneration apparatus for a working machine includes a regeneration circuit that is connected to a hydraulic line through which a returning fluid of a boom cylinder is distributed during a boom lowering operation. Also included are a hydraulic motor connected to a generator, a flow regulating circuit that is connected to the hydraulic line and provided with a control valve, an inverter that controls the flow rate on the regeneration circuit in accordance with a first flow rate setting which varies with the operation amount of an operating apparatus, and a control valve and a proportional valve that control the flow rate on the flow regulating circuit in accordance with a second flow rate setting which varies with the operation amount of the operating apparatus. Therefore, the motive power regeneration apparatus is capable of making an operator constantly feel comfortable with the working machine operations.

Motive power regeneration system for working machine

A construction machine includes: a work arm rotatably mounted at a construction machine main body; a work tool mounted at the work arm; an attitude decision device that decides an attitude of the work arm or the work tool relative to the construction machine main body; a follow-up enabling device that allows the work arm or the work tool to follow a displacement of a contacting object that comes into contact with the work tool and applies an external force to the work tool, by adjusting the attitude of the work arm or the work tool decided by the attitude decision device; and a switching device that selects whether or not to allow the work arm or the work tool to follow the displacement of the contacting object via the follow-up enabling device.

A double-arm working machine has an upper swing structure, an operator cabin, left swing post and right swing post provided in front of the upper swing structure, and a left work front A and right work front B provided on the left swing post and the right swing post, respectively, such that the work fronts A, B each sway vertically. An interference prevention controller generates an output signal to swing the swing postspursuant to a differential angle between the left and right work fronts A, B and to a command signal from an operating device. A differential angle range in which the left and right work fronts A, B are likely to come into contact with each other is defined as an interference danger area (N), and an assigned differential-angle range contiguous to the interference danger area is defined as a semi-interference danger area.

Double-arm working machine

The invention is intended to provide a position measuring system for a working machine, which can accurately measure the position of a monitoring point and can ensure high working efficiency even when measurement accuracy of a machine-equipped GPS has changed. A panel computer () computes the position of the monitoring point, which is set on an operating mechanism, in a three-dimensional space based on values measured by GPS receivers () and angle sensors (). When measurement accuracy of at least one of at least two GPS receivers lowers, the panel computer () corrects the computation for the position of the monitoring point based on a yaw angle measured by a gyroscope () for measuring the yaw angle of a machine body.

Position measuring system for working machine

The invention is intended to provide an excavation teaching device for a construction machine which can realize easy confirmation of a proper target excavation surface and increase the working efficiency during excavation even in work of forming the face of slope in complicated three-dimensional landforms. A display unit () displays, as an image in a first screen area (), a plurality of small plane surfaces G constituting a three-dimensional target landform and illustrations of a body S of the construction machine and a bucket B as an excavating tool at a fore end of an operating mechanism.

Excavation teaching apparatus for construction machine

Growing community of inventors

Tsuchiura, Japan

Kazuo Fujishima