-
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.
-
公开(公告)号：US20220145580A1
公开(公告)日：2022-05-12
申请号：US17437902
申请日：2020-09-08
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Teruki IGARASHI , Akihiro NARAZAKI , Shuuichi MEGURIYA
Abstract: A work machine includes a work device having a boom, an arm, and work equipment and a controller that sets a target surface, and calculates a work equipment-to-target surface distance on the basis of signals from a position sensor and a posture sensor, and controls the boom and carries out deceleration control to decelerate the arm to keep the work equipment from excavating ground beyond the target surface when operation of the arm is carried out and the work equipment-target surface distance has become shorter than a predetermined distance. The controller determines whether or not there is a possibility that the work equipment enters the target surface when operation of the arm is carried out based on the set target surface and the signals from the position sensor and the posture sensor, and does not carry out the deceleration control even when the work equipment-to-target surface distance is shorter than the predetermined distance in the case in which it is determined that there is no possibility that the work equipment enters the target surface.
-
公开(公告)号：US20200277752A1
公开(公告)日：2020-09-03
申请号：US16645502
申请日：2018-12-20
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Teruki IGARASHI , Shiho IZUMI
Abstract: A hydraulic excavator includes a controller having an actuator control section that executes machine control of operating a work implement in accordance with a predetermined condition in a case in which a work implement is positioned in a deceleration area, and that does not execute machine control in a case in which the work implement is positioned in a non-deceleration area. The controller further includes an operation deciding section that decides operation of the work implement on the basis of an operation amount of an operation device, and a display control section that displays, on a display device, a positional relationship among the work implement, a target surface and a boundary line between the deceleration area and the non-deceleration area. The actuator control section executes machine control while changing the position of the boundary line depending on a result of the decision by the operation deciding section, and the display control section changes the display position of the boundary line on the display device, depending on the result of the decision by the operation deciding section.
-
公开(公告)号：US20240026656A1
公开(公告)日：2024-01-25
申请号：US18032285
申请日：2021-10-14
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Shuuichi MEGURIYA , Teruki IGARASHI , Akihiro NARAZAKI
CPC classification number: E02F9/262 , E02F3/439 , E02F9/2285
Abstract: A work machine includes a swing structure, a work device, a position sensor, a posture sensor and a controller that performs machine control on the basis of a target surface set on the basis of target shape data, the position information of the swing structure, and the information about the posture of the work machine. When the controller becomes unable to obtain the position information of the swing structure, the controller stores swing angle information of the swing structure, the swing angle information being sensed by the posture sensor at that time. The controller prohibits execution of the machine control when the swing structure is positioned outside a swing range; and permits the execution of the machine control when the swing structure is positioned inside the swing range and when the swing structure is positioned inside the swing range again after being positioned outside the swing range.
-
公开(公告)号：US20220025608A1
公开(公告)日：2022-01-27
申请号：US17274926
申请日：2019-11-29
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Masamichi ITOH , Teruki IGARASHI , Akihiro NARAZAKI
Abstract: When a bucket 10 is grounded on soil, an operation signal is outputted or corrected such that a relative angle of the bucket 10 with respect to a target surface is maintained if a distance D between the bucket 10 and the target surface 60 is equal to or less than a preset first threshold value D1. When the bucket 10 is not grounded on soil, the operation signal is outputted or corrected such that the relative angle of the bucket 10 with respect to the target surface 60 is maintained if the distance between the bucket 10 and the target surface 60 is equal to or less than a preset second threshold value D2 set smaller than the first threshold value D1. As a result, control to maintain an angle of a work tool can be suitably started.
-
Patent Agency Ranking
公开(公告)号：US20230332375A1
公开(公告)日：2023-10-19
申请号：US18023448
申请日：2021-12-10
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Yusuke SUZUKI , Hiroaki TANAKA , Yasuhiko KANARI , Hiroshi SAKAMOTO , Teruki IGARASHI , Akihiro NARAZAKI
CPC classification number: E02F3/435 , E02F9/2203 , E02F9/262 , E02F9/265 , E02F9/2285
Abstract: The invention of the present application intends to provide a work machine that can improve the work performance by keeping the work state of work equipment conforming to the intention of an operator in machine control for causing the work equipment to follow an excavation target surface. For this purpose, a controller determines the work state of the work equipment on the basis of an operation input amount inputted from an operation input device and the posture of the work equipment with respect to the target surface, computes a range of an action command value of actuators in which the work state determined is kept, and corrects, within the range, the action command value of the actuators to make the distance between the work equipment and the target surface small.
-
公开(公告)号：US20220275604A1
公开(公告)日：2022-09-01
申请号：US17637598
申请日：2021-03-10
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Teruki IGARASHI , Kento KUMAGAI , Akihiro NARAZAKI
Abstract: Provided is a remote control system for work machine capable of enhancing the stability and efficiently improving the operability. A remote control system for a work machine having a plurality of actuators 31 corrects all command signals for the actuators 31 being operated when a communication delay time occurs during operation with the actuators 31. This limits the operation of the actuators 31 while keeping the ratio of the command signals (operation signals) of the actuators 31.
-
公开(公告)号：US20240376691A1
公开(公告)日：2024-11-14
申请号：US18688848
申请日：2023-03-30
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Teruki IGARASHI , Hiroaki TANAKA , Ryohei FUKUCHI , Yusuke SUZUKI
IPC: E02F9/22 , E02F9/26 , F15B13/044
Abstract: A work machine includes a flow control valve that controls the flow rate of a hydraulic operating fluid supplied from a hydraulic pump to a hydraulic cylinder, a solenoid valve that generates an operation pressure for operating the flow control valve, and a controller. The controller executes learning processing of changing in a stepwise manner the operation pressure generated by the solenoid valve, sensing the pressure of the hydraulic cylinder, and storing the operation pressure when the pressure of the hydraulic cylinder has become a reference value, as a learning result operation pressure. The controller calculates a differential pressure across the flow control valve and computes a target opening area of the flow control valve on the basis of the differential pressure across the flow control valve and a target flow rate of the hydraulic operating fluid that passes through the flow control valve. The controller computes a target value of the operation pressure generated by the solenoid valve, on the basis of an opening characteristic table, the target opening area, and the learning result operation pressure, and controls the solenoid valve on the basis of the target value of the operation pressure.
-
公开(公告)号：US20240254728A1
公开(公告)日：2024-08-01
申请号：US18282925
申请日：2022-03-11
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Ryohei FUKUCHI , Katsuaki KODAKA , Mitsuhiko KANEHAMA , Teruki IGARASHI
CPC classification number: E02F9/2292 , E02F9/2242 , E02F3/32
Abstract: A work machine includes: a first pump and a second pump that are driven by an engine; a hydraulic actuator driven by a hydraulic working fluid supplied from the first pump; a control valve that controls a flow of the hydraulic working fluid supplied to the hydraulic actuator; a solenoid valve that reduces a pressure of the second pump to generate a pilot pressure for operating the control valve; a controller that controls the solenoid valve; an engine operating section that enables operation for activating the engine; and a rotation speed sensor that senses a rotation speed of the engine. The controller applies a drive current to the solenoid valve to drive the solenoid valve when a current application condition is established, the current application condition including that it is assessed, on the basis of a sensing result of the rotation speed sensor, that the engine is in a stopped state, and including that ON operation of the engine operating section is performed in a state where activation operation is not performed by the engine operating section.
-
公开(公告)号：US20240167250A1
公开(公告)日：2024-05-23
申请号：US18279224
申请日：2022-09-08
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Teruki IGARASHI , Ryohei FUKUCHI , Yusuke SUZUKI , Hiroaki TANAKA , Mitsuhiko KANEHAMA
CPC classification number: E02F9/2228 , E02F3/32 , E02F9/2267 , F15B19/005
Abstract: A work machine includes: a work device including a plurality of hydraulic actuators and a plurality of driving target members; a posture sensor that senses posture information of the work device; a control valve unit that controls flows of hydraulic operating fluid supplied from the hydraulic pump to the plurality of hydraulic actuators; a plurality of solenoid valves that generate pilot pressure for driving the control valve unit; and a controller that computes a command value of the pilot pressure to be generated by the solenoid valves, and outputs a control signal corresponding to the command value to the solenoid valves. The controller computes a gravitational direction component of an action direction vector of the driving target members on the basis of the posture information sensed by the posture sensor, corrects the command value of the pilot pressure on the basis of the gravitational direction component of the action direction vector when the command value exceeds a predetermined pressure, and outputs the control signal corresponding to the command value after the correction to the solenoid valves.
-
-
-
-
-
-
-
-
-
Search Results
13
records
(took 0.016 seconds)
