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公开(公告)号：US20210079625A1
公开(公告)日：2021-03-18
申请号：US16768951
申请日：2018-12-26
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Ryu NARIKAWA , Hiroshi SAKAMOTO , Hidekazu MORIKI , Shinji ISHIHARA
Abstract: A hydraulic excavator including a controller that calculates the positional relationship between a bucket and a target surface and a display device that displays the positional relationship between the bucket and the target surface includes an actuator state sensor that detects the pressure of a hydraulic cylinder. The controller calculates the velocity of the bucket based on the position of a work implement and the operation amount of an operation device and changes the contents of informing by the display device according to the velocity of the bucket, the distance between the bucket and the target surface, and the pressure of the hydraulic cylinder. The display device displays the contents of informing changed by the controller.
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公开(公告)号：US20210018942A1
公开(公告)日：2021-01-21
申请号：US16306908
申请日：2017-06-01
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Yoshiyuki TSUCHIE , Hiroshi SAKAMOTO
Abstract: A work machine includes an operation intention determining section that determines whether or not an operator has an intention of operating an operation member based on a state change of the operation member, a current supply section that supplies a current to a solenoid valve device based on an operation of the operation member, and a current control section that permits supply of a standby current from the current supply section to the solenoid valve device when it has been determined by an operation position determining section that the operation member is disposed within a preset neutral range and it has been determined by the operation intention determining section that there is an intention of operating the operation member, the standby current being lower than a current of the time when a hydraulic actuator starts driving.
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公开(公告)号：US20200277757A1
公开(公告)日：2020-09-03
申请号：US16486915
申请日：2018-03-14
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Kazushige KUROKAMI , Hiroshi SAKAMOTO , Shigeki TOKITA
Abstract: A mode selecting device configured to select a work mode of a hydraulic excavator, a work determining section configured to determine whether work contents of the hydraulic excavator are work contents other than those of the selected work mode on the basis of a detection result of pilot pressure sensors, a minimum alarm region determining section configured to determine one of a plurality of minimum alarm regions preset on the periphery of the hydraulic excavator on the basis of a selection result of the mode selecting device and a determination result of the work determining section, and an alarm determining section configured to output an alarm signal to a buzzer when the relative position of an obstacle, the relative position being computed by an obstacle position calculating section, is inside an alarm region set so as to include the minimum alarm region determined by the minimum alarm region determining section.
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公开(公告)号：US20200277751A1
公开(公告)日：2020-09-03
申请号：US16486917
申请日：2018-03-15
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Takaaki CHIBA , Hiroaki TANAKA , Hisami NAKANO , Hiroshi SAKAMOTO , Yusuke SUZUKI
IPC: E02F3/43 , E02F3/32 , E02F9/22 , E02F9/20 , E02F3/38 , E02F3/42 , E02F9/26 , F15B11/046 , F15B11/17 , F15B11/20
Abstract: Target speeds of an arm cylinder and a boom cylinder are computed in response to a distance D between a bucket tip end and a target surface in such a manner that an operating range of a work device is limited on and above the target surface at a time of operating an operation device. A second flow control valve that supplies a hydraulic operating fluid from a second hydraulic pump to the boom cylinder is controlled on the basis of the target speed of the boom cylinder while a first flow control valve that supplies a hydraulic operating fluid from a first hydraulic pump to the arm cylinder and a third flow control valve that supplies the hydraulic operating fluid from the second hydraulic pump to the arm cylinder are controlled on the basis of the target speed of the arm cylinder.
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公开(公告)号：US20200226849A1
公开(公告)日：2020-07-16
申请号：US16647749
申请日：2019-03-07
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Mariko MIZUOCHI , Hiroshi SAKAMOTO
Abstract: In a worker management system comprising a terminal device, a worker detection system, and a site management device, the terminal device transmits a worker signal, which includes terminal GNSS positional information represented by a GNSS coordinate system of the terminal device, to the site management device. The worker detection system transmits worker detected positional information, which indicates a position of the worker detected by a surrounding monitoring sensor mounted on the work machine, to the site management device. The site management device relates the terminal GNSS positional information to the worker detected positional information, and when both information for the same worker is available, it selects a position indicated by the worker detected positional information, and when only the terminal GNSS positional information is available, it selects a position indicated by the terminal GNSS positional information, as a current position of the worker.
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Patent Agency Ranking
公开(公告)号：US20190390436A1
公开(公告)日：2019-12-26
申请号：US16491220
申请日：2018-04-25
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Hiroaki TANAKA , Hisami NAKANO , Takaaki CHIBA , Yuusuke SUZUKI , Hiroshi SAKAMOTO
Abstract: Provided is a work machine equipped with a semi-automatic control for assisting operator's operation in works to excavate the ground to form a surface as designed, which work machine can assist operator's operation in compaction works to compact the ground to form a surface as designed. In a work machine 100 including a controller 25 having a semi-automatic control section 31 that corrects an operation amount indicated by an instruction given by operation devices 15L and 15R, the controller includes: a compaction determining section 52 that determines whether or not a work tool 7 is being pressed against a ground; and an actuator control correcting section 54 that further corrects an operation amount having been corrected by the semi-automatic control section, such that a force that the work tool applies to the ground increases if the work tool is determined by the compaction determining section as being pressed against the ground.
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公开(公告)号：US20190040605A1
公开(公告)日：2019-02-07
申请号：US16082552
申请日：2017-09-20
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Hiroyuki KOBAYASHI , Hiroshi SAKAMOTO , Yoshiyuki TSUCHIE
Abstract: Lever neutrality is determined by whether or not operation levers are at a neutral position based on operation signals from operation levers. Pilot pressures are computed based on the operation signals from the operation levers; and pilot pressure signals are converted to current signals. A current interruption controller controls interruption and communication of the current signals to the solenoid proportional valves; and an operating condition is determined by determining whether a construction machine is in a manual operation state or a semiautomatic operation state. At least one hydraulic actuator is controlled to assist the operation of the operator, and when it is determined that the construction machine is in the semiautomatic operation state, the current interruption controller interrupts the current signals to all of the solenoid proportional valves only when it is determined that all the operation levers are at the neutral position.
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公开(公告)号：US20220220694A1
公开(公告)日：2022-07-14
申请号：US17434491
申请日：2020-08-03
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Yusuke SUZUKI , Hiroaki TANAKA , Hisami NAKANO , Hiroshi SAKAMOTO , Akihiro NARAZAKI
Abstract: In a hydraulic excavator including a main controller that can execute area restriction control, the main controller is configured to calculate an operation velocity Vfx of a front work device in a machine body coordinate system and a movement velocity (dragging velocity) Vu of a machine body in a gravity coordinate system and correct a direction of a calculated target velocity vector Vt upward away from a construction target surface when generation of dragging is detected during execution of the area restriction control based on the calculated operation velocity Vfx of the front work device 2 and the calculated movement velocity Vu of the machine body.
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公开(公告)号：US20210115643A1
公开(公告)日：2021-04-22
申请号：US16981508
申请日：2019-06-13
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Hiroaki TANAKA , Hisami NAKANO , Yuusuke SUZUKI , Hiroshi SAKAMOTO
Abstract: To provide a work machine that can maintain the construction precision of semi-automatic control irrespective of excavation depths and differences in soil nature. A controller acquires soil-nature information on the basis of an operation command given to a work implement, a bucket-claw-tip position outputted from a bucket-position measuring device, and a drive load of the work implement outputted from a load measuring device; generates a soil-nature map on the basis of the bucket-claw-tip position, and the soil-nature information; calculates an estimated load that is an estimate of an excavation load on the basis of the soil-nature map and a bucket-claw-tip target position; and corrects the operation command in accordance with the estimated load.
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公开(公告)号：US20210040705A1
公开(公告)日：2021-02-11
申请号：US16760530
申请日：2018-11-08
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Shinji ISHIHARA , Hiroshi SAKAMOTO , Hidekazu MORIKI , Ryu NARIKAWA
Abstract: A construction machine that can make a depressing force of a bucket during compaction work to be uniform without requiring an operator to perform a complicated operation is provided. A controller 18 determines whether or not compaction work is in progress, calculates a front distance R that represents a distance between a rotational pivot of a boom 4 and a predetermined position B in a back surface of a bucket 6, determines a target velocity of the bucket such that a velocity with which the bucket approaches a leveling target surface decreases with increasing values of the front distance, and, during the compaction work, notifies the operator of details of an operation of operation devices 9a and 9b for achieving the target velocity of the bucket or controls hydraulic actuators 4a to 6a so as to achieve the target velocity of the bucket.
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