Hitachi Construction Machinery Co., Ltd.

Hitachi, Ltd.

Hitachi-high-technologies Corporation

Kabushiki Kaisha Toyota Jidoshokki

Manabu Edamura

Ken Yoshioka

Kouji Ishikawa

Hidetoshi Satake

Shiho Izumi

Ryoji Nishio

Takatoshi Ooki

Hideyuki Kazumi

Masatsugu Arai

Tsunehiko Tsubone

Kenji Maeda

Saburo Kanai

Tsutomu Tetsuka

Akira Doi

Hidekazu Moriki

Manabu Sugiura

Hiroshi Sakamoto

Shinji Nishikawa

Seiji Ishida

Takenori Hiroki

Shinya Imura

Toshihiko Nakata

Yukio Kembo

Saburou Kanai

Go Miya

Shuichi Baba

Takafumi Morimoto

Toru Kurenuma

Masahiro Watanabe

Masatoshi Hoshino

Kazue Takahashi

Naoyuki Tamura

Shinji Ishihara

Yusuke Kajita

Kazuyuki Ikenaga

Kouichi Shibata

Ryu Narikawa

Hiroshi Kuroda

Tetsunori Kaji

Akitaka Makino

Tsutomu Udagawa

Mitsuo Sonoda

Satoshi Sekino

Toshihiko Ishida

Yuuichirou Morita

Hiroyuki Yamada

Yasutaka Tsuruga

Hiroki Kawada

Hideyuki Yamamoto

Motohiko Yoshigai

Kazuo Fujishima

Susumu Tauchi

Hiroaki Tanaka

Takaaki Chiba

Hisami Nakano

Shinjiro Ueda

Masataka Sasaki

Yasuhiko Kanari

Kazuaki Ichihashi

Atsushi Ootake

Ryohei Yamashita

Akira Nakayama

Ryujiro Udo

Kentarou Itoga

Toshihiko Watanabe

Shinya Okumura

Tsutomu Umehara

Kohei Hiromatsu

Takahiko Kurose

Takanori Nakatsuka

Jun Kikuchi

Yuusuke Kajita

Naoki Ishikawa

An hydraulic excavator calculates an estimated excavation volume Va defined by a bucket claw tip position (first position) at an excavation start, a bucket claw tip position (second position) at an excavation end set in advance, a current landform, a first target surface, and a bucket width w. A second target surface is generated at a position superior to the first target surface when the estimated excavation volume Va exceeds a limit volume Vb; and the second target surface is generated at a position at which the excavation volume defined by the first position, the second position, the current landform, the second target surface, and the bucket width is closer to the limit volume Vb. The hydraulic actuators are controlled such that an operating range of a work implement is limited on the second target surface and to an area superior to the second target surface.

Work machine

A hydraulic excavator includes a controller () that executes region limiting control to forcibly raise a boom () in such a manner that a position of a tip end of a bucket () is kept on a target excavation surface and within a region above the target excavation surface if an operation device () issues an action direction to an arm () or the bucket. The controller determines which is selected as a control mode over a raising speed of the boom at a time of executing region limiting control, a first mode or a second mode specified by a raising speed lower than a raising speed of the first mode if the tip end of the bucket is located below the target excavation surface, and controls the raising speed of the boom based on a result of determination.

Hydraulic excavator

A hydraulic excavator () provided with a controller () having a machine control section () that executes machine control for moving a work implement (A) following a predetermined condition at the time of operation of operation devices (, and) includes a level-of-intervention input device () that is operated by an operator. The controller includes a correction amount calculating section () that calculates a correction amount of a level of intervention indicating a degree of intervention by the machine control in an operation of the work implement instructed through operation of the operation devices, based on an operation amount of the level-of-intervention input device. The machine control section executes the machine control to intervene in the operation of the work implement instructed through the operation of the operation devices at a level of intervention corrected based on the correction amount calculated at the correction amount calculating section.

A work machine () includes a controller () having a notification control section () that exercises control as to whether to notify an operator of operation support information in accordance with a distance between a predetermined target surface, out of a plurality of discretionally set target surfaces, and a work implement (A), the work machine including a current terrain profile acquisition device () that acquires a position of a current terrain profile, the controller including a target surface comparison section () that compares the position of the current terrain profile () with a position of the predetermined target surface () to determine a vertical position relationship between the current terrain profile and the predetermined target surface. The notification control section () changes content of the operation support information in accordance with a result of determination by the target surface comparison section.

Provided is a hydraulic excavator () that performs work by operating an arm () after moving a bucket () to a work start position. An operation determination section () determines, based on an operation performed on an operation device, whether a front work device (A) is engaged in a work preparation operation for moving the bucket to the work start position. When the operation determination section determines that the front work device is engaged in the work preparation operation at the time of operation of the operation device, an actuator control section () controls a bucket cylinder () such that the angle of a work tool with respect to a target surface coincides with a preset target angle (&#x3b8;TGT).

A hydraulic excavator includes: a multijoint type front implement that is configured by coupling a plurality of driven members including a bucket; inertial measurement units that detect posture information about the plurality of driven members; and a calibration value computing section that computes calibration parameters used in calibration of detection results of the inertial measurement units; and a work position computing section that computes a relative position of the bucket to the machine body on the basis of the detection results of the inertial measurement units and the computation result of the calibration value computing section, and the calibration value computing section computes the calibration parameters on the basis of the detection results of the inertial measurement units in a plurality of postures of the front implement in which a reference point set on any of the plurality of driven members in advance matches a reference position.

Construction machine

A controller () of a hydraulic excavator () includes: a first distance calculation section () calculating a first distance Dthat is a distance between a bucket toe and a target surface on a virtual straight line Lv extended vertically from the bucket toe, based on position information on the bucket toe and position information on the target surface (); and a second distance calculation section () calculating a second distance Dthat is a distance between the target surface and a current landform on the virtual straight line Lv, based on the position information on the bucket toe and the position information on the target surface and position information on the current landform. A display device () displays the first distance Dand the second distance D

The construction machine includes: a body (); work equipment () having a plurality of swingable work elements (); a plurality of hydraulic actuators () for driving the work equipment; a plurality of ground angle sensors (to) for detecting the ground angles of the work elements; and an excavation support device () including an information processing device (). The information processing device includes: a load information acquiring section () for acquiring load information including the load direction in the swing center of at least one of the work elements according to signals from the ground angle sensors; and a working point position calculating section () for calculating the position of the working point of the work equipment according to the signals from the ground angle sensors and the load information from the load information acquiring section.

A work machine includes: a satellite communication antenna for detecting a position of an upper swing structure; angle sensors detecting postures of two work devices; position computing devices that calculate postures/positions of the two work devices on the basis of outputs from the satellite communication antenna and the angle sensors; a display device on which the position of at least one work device of the two work devices and a position of a target surface are displayed; a display selection switch that outputs a first input signal for displaying a work device selected by an operator from between the two work devices on the display device; and a display changeover section that displays the work device corresponding to the first input signal input from the display selection switch out of the two work devices and the position of the target work object of the work device on the display device.

A hydraulic excavator acquires operation content frequency data in a designated period based on output values output from a plurality of sensors sensing parameters that serve as indicators of operation contents performed via an operation device. A storage section stores a plurality of guide screens each corresponding to one of a plurality of work patterns of the hydraulic excavator. A work identifying section searches actual result data in the storage section for actual result data that matches or is similar to the operation content frequency data acquired by the data acquiring section in terms of operation contents and frequency thereof, and that identifies a current work pattern based on a work pattern allocated to actual result data related to a result of the search. A display device displays a guide screen corresponding to the work pattern identified by the work identifying section among the plurality of guide screens.

An area limit control part as a control section outputs a requested boost pilot pressure for driving a control valve, based upon a pilot pressure in accordance with an operating amount of an operating lever and a posture signal of a posture sensor. A drive permission determination part determines whether or not a drive of a hydraulic actuator is permitted based upon the pilot pressure in accordance with the operating amount of the operating lever. A pilot pressure selecting part selects the requested boost pilot pressure from the area limit control part in such a manner as to drive the control valve with the requested boost pilot pressure to the hydraulic actuator the drive of which is permitted, and not to drive the control valve to the hydraulic actuator the drive of which is not permitted.

Drive control device for construction machine

The first engine speed or a work machine is higher than the minimum engine speed, and the second engine speed is higher than the first engine speed and lower than the maximum engine speed. The ratio of the change in the target engine speed to the change in the operation amount of the engine speed instructing device when the operation amount of the engine speed instructing device is changed from the operation amount for instructing the minimum speed to the operation amount for instructing the first engine speed is larger than the ratio of the change in the target engine speed to the change in the operation amount of the engine speed instructing device when the operation amount of the engine speed instructing device is changed from the operation amount for instructing the second engine speed to the operation amount for instructing the maximum speed.

A display system for a construction machine includes: a moving direction computing section for computing a predictive moving direction of a bucket; a work-tool display control section that, if the moving direction computing section predicts a movement of the bucket, changes the display position of a bucket image based on the predictive moving direction such that the area of a region located on the predictive moving direction side from the bucket image on the display screen of a monitor is displayed wider than when the bucket image is displayed at a reference position and that displays the bucket image at the reference position if a movement of the bucket cannot be predicted. A target-surface display control section displays on the display screen an image of a target surface when the bucket image is displayed at the display position determined by the work-tool display control section.

Display system for construction machine

A construction machine acquires efficiently and accurately the target surface to be displayed or controlled. The construction machine includes: a design surface information storage unit storing three-dimensional target shape as multiple design surfaces; a work equipment velocity vector acquisition unit detecting or estimating the velocity of work equipment; a work equipment position acquisition unit detecting or estimating the position of the work equipment; a target surface acquisition unit acquiring a principal target surface to acquire an estimated target surface that is potentially the next principal target surface; an operation control unit correcting the work equipment velocity; and a display unit displaying the positional relations between the work equipment position and the principal target surface. The target surface acquisition unit includes an estimated target surface calculation unit determining as an estimated target surface the design surface located in the direction of the work equipment velocity vector.

Provided are a work machine, a power unit, and a diesel engine of a work machine that make it possible to reduce emitted noxious substances to levels below reference values stipulated by exhaust gas regulations in advanced countries and regions while also omitting or simplifying a post-treatment device. A hydraulic pump is driven by a diesel engine that limits maximum output torque in a low revolution speed region lower than a high revolution speed region including a rated revolution speed in such a manner that the maximum output torque has a characteristic of intermediate torque lower than torque of a maximum output horsepower point at the rated revolution speed, and a hydraulic actuator is driven by hydraulic fluid delivered from the hydraulic pump.

Work machine, power unit, and diesel engine of work machine

Growing community of inventors

Kasumigaura, Japan

Manabu Edamura