公开(公告)号：US20240287765A1

公开(公告)日：2024-08-29

申请号：US18572600

申请日：2022-03-22

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Hiroki ISHII ,  Shinjiro YAMAMOTO ,  Koji SHIWAKU

IPC: E02F9/22 ,  E02F3/43 ,  E02F9/20

CPC classification number: E02F9/2267 ,  E02F3/43 ,  E02F9/2029

Abstract: A work machine is capable of appropriately setting a target locus and target postures for a work implement depending on an excavation environment and an excavation object under automatic excavation control. To accomplish this, a controller calculates a target locus passing through an excavation starting position where a control point is positioned when an excavation is started, an excavation-in-progress position where the control point is positioned when the excavation is in progress, and an excavation finishing position where the control point is positioned when the excavation is finished, and a target posture for the work implement at the time the control point moves on the target locus. The controller controls a control valve such that the control point moves on the target locus and such that a posture of the work implement at the time where the control point moves on the target locus matches the target posture.

公开(公告)号：US20240229418A9

公开(公告)日：2024-07-11

申请号：US18279442

申请日：2022-03-15

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Shinjiro YAMAMOTO ,  Shinya IMURA ,  Koji SHIWAKU ,  Hiroki ISHII

IPC: E02F9/20 ,  E02F9/22 ,  E02F9/24

CPC classification number: E02F9/205 ,  E02F9/2004 ,  E02F9/2203 ,  E02F9/24

Abstract: Provided is a work machine control system which enables a worker to perform a work more easily in the vicinity of a work machine executing a task automatically. A work machine control system comprises: a work machine that executes a task automatically as a work to be executed; and a task control device for controlling execution of the task. The work machine comprises a vehicle body control device and a hydraulic actuator used for executing the task, wherein the vehicle body control device comprises: a task content input section for receiving input of task content information; a movement control section for calculating a speed instruction of the hydraulic actuator based on the task content information; a receiving section for receiving task control information outputted from the task control device having a task control input section for receiving input of the task control information; and a task control section for controlling execution of the task based on the task control information.

公开(公告)号：US20230358022A1

公开(公告)日：2023-11-09

申请号：US18025707

申请日：2021-12-08

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Kento KUMAGAI ,  Shinya IMURA ,  Yasutaka TSURUGA ,  Takaaki CHIBA ,  Hiroaki AMANO ,  Shinji NISHIKAWA ,  Akihiro NARAZAKI ,  Genroku SUGIYAMA ,  Shinjiro YAMAMOTO

IPC: E02F9/22

CPC classification number: E02F9/2228

Abstract: The invention of the present application intends to provide a work machine that can ensure high operability by preventing abrupt actuation of an actuator and a shock to a machine body by use of a bleed-off function at the time of starting of the actuator and that can improve the energy-saving performance by reducing a bleed-off flow rate after the starting of the actuator. For this purpose, a controller opens a bleed-off valve at a timing at which an operation device is being operated and before a flow rate of a hydraulic pump starts increasing, and closes the bleed-off valve at a timing at which the operation device is being operated and after the flow rate of the hydraulic pump has started increasing.

公开(公告)号：US20230332379A1

公开(公告)日：2023-10-19

申请号：US18026621

申请日：2022-02-04

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Hiroki ISHII ,  Shinjiro YAMAMOTO

IPC: E02F9/22

CPC classification number: E02F9/2278 ,  E02F9/2203

Abstract: A work machine includes hydraulic actuators that drive a work implement, and a controller configured to output a control signal for controlling each hydraulic actuator on the basis of a velocity command to each actuator computed at each computation cycle. When controlling an action of a first hydraulic actuator under a predetermined condition according to an action of a second hydraulic actuator, the controller computes a velocity command to the first hydraulic actuator at a current computation cycle, with use of an actual velocity of each hydraulic actuator at the current computation cycle computed on the basis of a sensing signal of a posture sensor and a history of past velocity commands to each hydraulic actuator computed at previous computation cycles before the current computation cycle, and outputs a control signal according to the velocity command to the first hydraulic actuator at the current computation cycle.

公开(公告)号：US20220154741A1

公开(公告)日：2022-05-19

申请号：US17435602

申请日：2020-05-20

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Hiroki ISHII ,  Shinjiro YAMAMOTO ,  Masamichi ITOU ,  Yasutaka TSURUGA ,  Shinya IMURA

IPC: F15B15/20

Abstract: There is provided a work machine that can limit operation of a work device by MC, and improves the responsiveness of a hydraulic actuator to operation of an operation device by an operator, and ensures operability equivalent to that of a work machine that does not have MC functions, and allows the hydraulic actuator for which the operation device is not being operated to automatically operate in either direction of the operation directions thereof. For this purpose, a drive system includes a selector valve 203a disposed between a secondary port 134a of an operation device 45a and a flow control valve 15a and between a proportional solenoid valve 54a and the flow control valve 15a and a selector valve 203b disposed between a secondary port 134b of the operation device 45a and the flow control valve 15a and between a proportional solenoid valve 54b and the flow control valve 15a. A controller 40 switches the selector valves 203a and 203b to either one of a first position and a second position on the basis of signals from pressure sensors 70a and 70b and pressure sensors 200a and 200b and target operation set in advance regarding the selector valves 203a and 203b.