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公开(公告)号：US20230323630A1
公开(公告)日：2023-10-12
申请号：US18023513
申请日：2022-02-18
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Shinya KASAI , Masamichi ITO , Shinjiro YAMAMOTO
CPC classification number: E02F9/205 , G05D2201/0202 , G05D1/0038
Abstract: Provided is a remote operation device capable of remotely operating efficiently and safely a work machine that is operated from a remote location, even when a communication delay occurs. The remote operation device includes a communication control section 222 that receives a camera video image of a work site captured by a vehicle-mounted camera 91 and vehicle body information of the work machine (hydraulic shovel) 1, a predicted trajectory computing section 220 that computes a predicted trajectory of the work machine (hydraulic shovel) 1 from the vehicle body information and outputs predicted trajectory data to be displayed as a video image on a display device 202, and a display control section 221 that causes the display device 202 to display the camera video image and the video image of the predicted trajectory on the same screen (simultaneously).
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公开(公告)号：US20190177952A1
公开(公告)日：2019-06-13
申请号：US16327150
申请日：2018-01-31
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Masamichi ITO , Takatoshi OOKI
Abstract: There is provided a hydraulic driving device for working machine having operability handling a change in burden weight in a front working device due to a loaded burden and the like when the working machine that accumulates energy in an accumulator and recovers and regenerates the energy performs an operation of lowering the front working device. A hydraulic driving device 5 includes a main pump 101, a boom cylinder 3, a tank 20, a flow rate control valve 6, an accumulator 300, a first differential pressure control valve 201, and a second differential pressure control valve 202. The first differential pressure control valve 201 is located between the boom cylinder 3 and the accumulator 300. The first differential pressure control valve 201 performs control on discharge oil from the boom cylinder 3 such that a differential pressure between before and after the flow rate control valve 6 becomes a target differential pressure. The second differential pressure control valve 202 is located between the accumulator 300 and the tank 20. The second differential pressure control valve 202 performs control on the discharge oil such that a differential pressure between an upstream pressure and a downstream pressure of the flow rate control valve 6 and the first differential pressure control valve 201 becomes the target differential pressure. The first and the second differential pressure control valves 201 and 202 are configured such that the target differential pressure increases according to an increase in pressure of the discharge oil.
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公开(公告)号：US20240011251A1
公开(公告)日：2024-01-11
申请号：US18037599
申请日：2021-11-15
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Takaaki CHIBA , Masamichi ITO , Koji SHIWAKU , Shinya KASAI , Morizo HENMI
IPC: E02F9/26
Abstract: Provided is a work machine including a controller configured to perform area restriction control for preventing a vehicle body from deviating from a work area set in a construction area. In this work machine, it is possible to easily set an area for which operation of the work machine is to be restricted in an actual space to a desired position, and to avoid displacement of the area for which the work machine is to be actually controlled from the set area. The work machine includes a controller configured to perform area restriction control for restricting operation of a vehicle body so as to prevent the vehicle body from deviating from a work area set in a construction area. The controller sets at least a part of the work area based on design data representing a final intended shape of a construction target in the construction area.
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公开(公告)号：US20230323631A1
公开(公告)日：2023-10-12
申请号：US18024695
申请日：2022-02-01
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Masamichi ITO , Koji SHIWAKU , Shinya KASAI
Abstract: Provided is a work machine including a front work device, the work machine including a state amount sensor that senses a state amount relating to an action state of the work device and a controller that controls an action of the work machine on the basis of an operation signal transmitted from a remote device by radio communication. The controller assesses a communication status of the radio communication, and, when restricting the action of the work machine on the basis of a result of the assessment, eases the restriction on the action of the work machine, depending on a sensing result from the state amount sensor. As a result, it is possible to appropriately restrict action on the basis of a communication status, while suppressing worsening of workability.
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公开(公告)号：US20220186458A1
公开(公告)日：2022-06-16
申请号：US17436486
申请日：2020-09-29
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Tarou AKITA , Takahiro KOBAYASHI , Akihiro NARAZAKI , Masamichi ITO
Abstract: When an operation amount of an operation lever corresponding to a boom cylinder is equal to or smaller than an operation amount of an operation lever corresponding to an arm cylinder, an estimated velocity of the arm cylinder used for region limiting control is computed on the basis of a first condition defining, in advance, a relation between the operation amount of the operation lever and the estimated velocity of the arm cylinder. When the operation amount of the operation lever corresponding to the boom cylinder is larger than the operation amount of the operation lever corresponding to the arm cylinder, the estimated velocity of the arm cylinder used for the region limiting control is computed as a velocity higher than the estimated velocity of the arm cylinder computed on the basis of the first condition. The behavior of the work device can thereby be stabilized.
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Patent Agency Ranking
公开(公告)号：US20200248430A1
公开(公告)日：2020-08-06
申请号：US16641772
申请日：2018-04-17
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Masamichi ITO , Ryuu NARIKAWA , Shinya IMURA
Abstract: A hydraulic excavator (1) is provided with a controller (40) including an actuator control section (81) which, when an operation device (45, 46) is operated, controls at least one of a plurality of hydraulic actuators (5, 6, 7) in accordance with the velocities of the plurality of hydraulic actuators (5, 6, 7) and a predetermined condition. The controller (40) determines, based on a sensed value from a posture sensor (50), the direction of a load exerted on an arm cylinder (6) due to the weight of an arm (9), outputs, upon determining that the direction of the load is opposite to a driving direction of the arm cylinder (6), a second velocity Vamt2 to the actuator control section (81), and outputs, upon determining that the direction of the load is the same as the driving direction of the arm cylinder (6), a third velocity Vamt3 to the actuator control section (81).
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公开(公告)号：US20220282459A1
公开(公告)日：2022-09-08
申请号：US17632362
申请日：2020-03-25
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Takaaki CHIBA , Shinya IMURA , Shinjiro YAMAMOTO , Masamichi ITO , Koji SHIWAKU
Abstract: Provided is an operation assistance system for a work machine having both operation assistance and work assistance functions, capable of reducing the inconvenience to an operator or the like of setting an area of the operation assistance function and an area of the work assistance function, and preventing a collision of the work machine with an object in a work area. The operation assistance system for a work machine has the operation assistance function of stopping a hydraulic excavator (work machine) 1 when an object is detected in a stop area 40 set in advance and the work assistance function of preventing the hydraulic excavator (work machine) 1 from going out of a work area 51 set in advance. When both of the work assistance function and the operation assistance function can be switched between enabled and disabled states, and when the work assistance function is in an enabled state and the work area 51 is set, the operation assistance system enables the operation assistance function and sets the work area 51 as the stop area 40.
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公开(公告)号：US20220145579A1
公开(公告)日：2022-05-12
申请号：US17433616
申请日：2019-09-30
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Shinya IMURA , Masamichi ITO , Hidekazu MORIKI , Yuho SAITO
Abstract: Provided is a work machine that can suppress decrease in work efficiency while reducing the possibility of contacting a worker or a dump truck, etc. A movement range is set in advance so as to avoid entry of a worker or a dump truck, etc. into the set movement range. The work machine performs stop control with clearance for an obstacle having entered the movement range, but performs stop control with relatively small clearance (minimum clearance) for a movement range. Thus, the work machine can reduce the frequency of stopping a body or a work implement and suppress decrease in work efficiency. Since the work machine controls the body or the work implement to stop with clearance when the worker or the dump truck, etc. enters the movement range of the work machine, the work machine can reduce the possibility of contacting the worker or the dump truck, etc.
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公开(公告)号：US20200157768A1
公开(公告)日：2020-05-21
申请号：US16328398
申请日：2017-09-13
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Masamichi ITO , Hisami NAKANO , Yusuke SUZUKI , Akihiro NARAZAKI , Teruki IGARASHI
Abstract: A controller for a hydraulic excavator includes a first speed computation section that calculates a first speed of an arm cylinder from a value detected by an operation amount sensor; a second speed computation section that calculates a second speed from a value detected by a posture sensor and a third speed computation section calculates a third speed that is used as the speed of the arm cylinder in an actuator control section adapted to execute MC. The third speed computation section calculates the first speed as the third speed during the period between the detection of an input of operation for an arm by the operation amount sensor and predetermined time to, the third speed as a speed calculated from the first speed and the second speed during the period between t0 and time t1, and the second speed as the third speed at and after time t1.
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公开(公告)号：US20180087243A1
公开(公告)日：2018-03-29
申请号：US15447836
申请日：2017-03-02
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Masamichi ITO , Takatoshi OOKI , Kiwamu TAKAHASHI
CPC classification number: E02F9/2225 , E02F3/32 , E02F9/22 , E02F9/2217 , E02F9/2232 , E02F9/2267 , E02F9/2271 , E02F9/2285 , E02F9/2296 , F15B1/027 , F15B1/04 , F15B11/024 , F15B11/08 , F15B13/026 , F15B13/0401 , F15B21/14 , F15B2211/20546 , F15B2211/212 , F15B2211/30535 , F15B2211/3111 , F15B2211/3133 , F15B2211/40561 , F15B2211/40569 , F15B2211/41554 , F15B2211/465 , F15B2211/50545 , F15B2211/50581 , F15B2211/57 , F15B2211/7053 , F15B2211/7128 , F15B2211/761 , F15B2211/88
Abstract: To keep operability of a hydraulic actuator excellent even in a state pressure has been sufficiently accumulated in a pressure accumulator. In a hydraulic driving device of a work machine including a hydraulic actuator, a tank, a flow control valve, and a pressure accumulator, there are further provided with a first pressure compensation valve that is for controlling difference between front and back pressures of the flow control valve constant and a second pressure compensation valve that is arranged between the pressure accumulator and the tank and is for controlling difference between front and back pressures of the flow control valve and the first pressure compensation valve constant.
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