US20240159016A1 - System and method for controlling work machine - Google Patents
System and method for controlling work machine Download PDFInfo
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- US20240159016A1 US20240159016A1 US18/282,355 US202218282355A US2024159016A1 US 20240159016 A1 US20240159016 A1 US 20240159016A1 US 202218282355 A US202218282355 A US 202218282355A US 2024159016 A1 US2024159016 A1 US 2024159016A1
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- Prior art keywords
- work machine
- remote operation
- communication unit
- onboard controller
- prohibited state
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- 238000000034 method Methods 0.000 title claims description 24
- 238000004891 communication Methods 0.000 claims abstract description 45
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000010295 mobile communication Methods 0.000 description 33
- 239000012530 fluid Substances 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000013024 troubleshooting Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2025—Particular purposes of control systems not otherwise provided for
- E02F9/205—Remotely operated machines, e.g. unmanned vehicles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/24—Safety devices, e.g. for preventing overload
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
Definitions
- the present disclosure relates to a system and a method for controlling a work machine.
- Some work machines can be started by a remote operation.
- a construction machine vehicle in Japanese Unexamined Patent Publication No. H08-156715 checks whether a predetermined condition is satisfied upon receiving a command signal from a transmitter, and starts an engine if the predetermined condition is satisfied.
- the predetermined condition includes, for example, the fact that the engine is stopped, the fact that a shift lever is in a neutral position, the fact that a parking brake is in an operating position, the fact that a door for the driver's seat is closed, or the like.
- Conditions in which a work machine is started are varied and not always the same. For example, there is a case where a work machine is started in order to start normal work at a work site or a case where maintenance work or troubleshooting is performed on the work machine. However, it is not easy to accurately understand a condition in which the work machine is started from a remote place.
- An object of the present disclosure is to start a work machine to be started by a remote operation at an appropriate timing according to a condition of the work machine.
- a system is a system for controlling a work machine.
- the system includes an onboard controller, a remote operation device, and a communication unit.
- the onboard controller is mounted on the work machine and controls the work machine.
- the remote operation device communicates with the onboard controller.
- the remote operation device transmits a start command signal for starting the work machine to the work machine.
- the communication unit is provided separately from the remote operation device.
- the communication unit communicates with the onboard controller.
- the communication unit is configured to be operated to switch the work machine from a start prohibited state to a start permitted state.
- the onboard controller switches the work machine from the start prohibited state to the start permitted state according to an operation of the communication unit.
- the onboard controller prohibits the work machine from starting when the work machine is in the start prohibited state, even in a case where the start command signal has been received from the remote operation device.
- the onboard controller starts the work machine when the work machine is in the start permitted state, in a case where the start command signal has been received from the remote operation device.
- a method is a method for controlling a work machine.
- the method includes communicating with a communication unit, switching the work machine from a start prohibited state to a start permitted state according to an operation of the communication unit, communicating with a remote operation device, determining whether a start command signal for the work machine has been received from the remote operation device, starting the work machine when the work machine is in the start permitted state in a case where the start command signal has been received from the remote operation device, and, prohibiting the work machine from starting when the work machine is in the start prohibited state even in a case where the start command signal has been received from the remote operation device.
- the work machine when an operator at a work site is performing work on the work machine, the work machine is prohibited from starting until the operator at the work site operates the communication unit to switch the work machine from the start prohibited state to the start permitted state. Therefore, even if a remote operator operates the remote operation device to transmit the start command signal to the work machine, the work machine does not start.
- the operator at the work site operates the communication unit to switch the work machine from the start prohibited state to the start permitted state after completing the work on the work machine. Accordingly, the remote operator operates the remote operation device to transmit the start command signal to the work machine, whereby the work machine starts.
- the work machine to be started by the remote operation can be started at an appropriate timing according to a condition of the work machine.
- FIG. 1 is a block diagram illustrating a configuration of a system for controlling a work machine according to an embodiment.
- FIG. 2 is a perspective view of the work machine.
- FIG. 3 is a flowchart illustrating processes for starting the work machine executed by an onboard controller.
- FIG. 1 is a block diagram illustrating a configuration of a system 1 according to the embodiment.
- the system 1 according to the present embodiment includes a work machine 2 , a remote operation device 3 , and a mobile communication unit 4 .
- the work machine 2 is disposed at a work site, such as a mine.
- the work machine 2 is a bulldozer, for example.
- FIG. 2 is a perspective view of the work machine 2 .
- the work machine 2 includes a body 10 and a work implement 13 .
- the body 10 includes a vehicle body 11 and a travel device 12 .
- the vehicle body 11 includes an operating cabin 14 and a power compartment 15 .
- An operator's seat that is not illustrated is disposed in the operating cabin 14 .
- the power compartment 15 is disposed in front of the operating cabin 14 .
- the travel device 12 is attached to a lower portion of the vehicle body 11 .
- the travel device 12 includes a pair of left and right crawler belts 16 . Only the left crawler belt 16 is illustrated in FIG. 1 .
- the work machine 2 travels due to the rotation of the crawler belts 16 .
- the work implement 13 is attached to the body 10 .
- the work implement 13 includes a lift frame 17 , a blade 18 and a lift cylinder 19 .
- the lift frame 17 is attached to the travel device 12 so as to be movable up and down.
- the lift frame 17 supports the blade 18 .
- the blade 18 is disposed in front of the vehicle body 11 .
- the lift cylinder 19 is coupled to the vehicle body 11 .
- the front end of the lift cylinder 19 is rotatably attached to a back surface of the blade 18 .
- the blade 18 moves up and down due to the extension and contraction of the lift cylinder 19 .
- the work machine 2 includes a power source 21 , a hydraulic pump 22 , and a power transmission device 23 .
- the power source 21 is an internal combustion engine.
- a starter motor 24 is connected to the power source 21 .
- the starter motor 24 starts the power source 21 .
- the hydraulic pump 22 is driven by the power source 21 to discharge hydraulic fluid.
- the hydraulic fluid discharged from the hydraulic pump 22 is supplied to the lift cylinder 19 .
- a plurality of hydraulic pumps may be provided.
- the power transmission device 23 transmits driving force of the power source 21 to the travel device 12 .
- the power transmission device 23 may be a hydro static transmission (HST), for example.
- the power transmission device 23 may be, for example, a transmission having a torque converter or a plurality of transmission gears.
- the work machine 2 includes an onboard controller 25 and a control valve 26 .
- the onboard controller 25 is mounted on the work machine 2 .
- the onboard controller 25 is implemented by a computer including a processor and a memory.
- the onboard controller 25 may be configured by a plurality of controllers separate from one another.
- the onboard controller 25 is programmed to control the work machine 2 based on acquired data.
- the control valve 26 is a proportional control valve and is controlled by a command signal from the onboard controller 25 .
- the control valve 26 is disposed between the hydraulic pump 22 and a hydraulic actuator such as the lift cylinder 19 .
- the control valve 26 controls the flow rate of the hydraulic fluid supplied from the hydraulic pump 22 to the lift cylinder 19 .
- the onboard controller 25 controls the control valve 26 so that the work implement 13 is raised or lowered.
- the control valve 26 may be a pressure proportional control valve. Alternatively, the control valve 26 may be an electromagnetic proportional control valve.
- the work machine 2 includes a camera 27 , an onboard operating member 28 , a first mode selection member 29 , and a second mode selection member 30 .
- the camera 27 is attached to the vehicle body 11 , for example.
- the camera 27 acquires an image of the surroundings of the work machine 2 .
- the camera 27 transmits an image signal indicative of the image of the surroundings of the work machine 2 to the onboard controller 25 .
- the onboard operating member 28 is disposed in the operating cabin 14 .
- the onboard operating member 28 is configured to be operated by an operator to cause the work machine 2 to travel. Further, the onboard operating member 28 is configured to be operated by the operator to cause the work implement 13 to move.
- the onboard operating member 28 includes an operating lever, for example.
- the onboard operating member 28 may include another operating member such as a pedal, a switch, a touch screen, or the like.
- the onboard operating member 28 transmits an operation signal indicative of an operation by the operator to the onboard controller 25 .
- the onboard controller 25 controls the power source 21 and the power transmission device 23 according to the operation signal, thereby causing the work machine 2 to travel.
- the onboard controller 25 controls the hydraulic pump 22 and the control valve 26 according to the operation signal, thereby causing the work implement 13 to move.
- the first mode selection member 29 is disposed in the operating cabin 14 .
- the first mode selection member 29 is configured to be operated by the operator to set a control mode of the work machine 2 .
- the first mode selection member 29 is, for example, a touch screen type input device.
- the first mode selection member 29 may be another input device, such as a switch.
- the first mode selection member 29 transmits an input signal indicative of an operation by the operator to the onboard controller 25 .
- the control mode includes a direct operation mode and a remote operation mode.
- the onboard controller 25 controls the work machine 2 according to the operation signal from the onboard operating member 28 . Therefore, in the direct operation mode, the operator operates the onboard operating member 28 , thereby causing the work machine 2 to move.
- the remote operation mode the work machine 2 is controlled according to a remote control signal from the remote operation device 3 . Therefore, in the remote operation mode, the operator operates the remote operation device 3 , thereby causing the work machine 2 to move.
- the second mode selection member 30 is attached to the work machine 2 .
- the second mode selection member 30 is configured to be operated by the operator to select the remote operation mode as the control mode for work machine 2 .
- the second mode selection member 30 is a switch, for example.
- the second mode selection member 30 may be another member, such as a lever, a touch screen, or the like.
- the second mode selection member 30 is disposed on an outer surface of the work machine 2 .
- the second mode selection member 30 is disposed at a position on the work machine 2 where an operator on the ground can operate.
- the second mode selection member 30 may be disposed at a height of 2000 mm or less on a lower part of the rear portion of the vehicle body 11 .
- the second mode selection member 30 transmits a selection signal indicative of an operation by the operator to the onboard controller 25 .
- the work machine 2 includes a first communication device 31 and a second communication device 32 .
- the first communication device 31 and the second communication device 32 are mounted on the work machine 2 .
- the first communication device 31 wirelessly communicates with the remote operation device 3 .
- the second communication device 32 wirelessly communicates with the mobile communication unit 4 .
- the communication methods of the first communication device 31 and the second communication device 32 may be same or different from each other.
- the work machine 2 and the remote operation device 3 may communicate with each other directly or via a control system or the like.
- the remote operation device 3 is disposed in a management center away from the work site. An operator in the management center can remotely operate the work machine 2 by operating the remote operation device 3 .
- the remote operation device 3 includes a communication device 33 , a remote operation member 34 , a remote input device 35 , a display 36 and a remote controller 37 .
- the communication device 33 wirelessly communicates with the first communication device 31 of the work machine 2 .
- the remote operation member 34 is configured to be operated by the operator to cause the work machine 2 to travel in the same manner as the onboard operating member 28 . Further, the remote operation member 34 is configured to be operated by the operator to cause the work implement 13 to move in the same manner as the onboard operating member 28 .
- the remote operation member 34 includes, for example, an operating lever.
- the remote operation member 34 may include another operating member, such as a pedal, a switch, a touch screen, or the like.
- the remote operation member 34 transmits an operation signal indicative of an operation by the operator to the remote controller 37 .
- the remote input device 35 is configured to be operated by the operator to input a setting of the work machine 2 .
- the remote input device 35 is, for example, a touch screen type input device.
- the remote input device 35 may be another input device, such as a switch.
- the remote input device 35 transmits an input signal indicative of an operation by the operator to the remote controller 37 .
- the remote controller 37 is implemented by a computer including a processor and a memory.
- the remote controller 37 may be configured by a plurality of controllers separate from one another.
- the remote controller 37 transmits a remote control signal to the onboard controller 25 via the communication device 33 .
- the remote controller 37 generates the remote control signal based on the operation signal from the remote operation member 34 or the input signal from the remote input device 35 .
- the onboard controller 25 controls the power source 21 and the power transmission device 23 according to the remote control signal from the remote controller 37 , thereby causing the work machine 2 to travel.
- the onboard controller 25 controls the hydraulic pump 22 and the control valve 26 according to the remote control signal from the remote controller 37 , thereby causing the work implement 13 to move.
- the onboard controller 25 transmits the image signal from the camera 27 to the remote controller 37 .
- the remote controller 37 displays the image indicative of the surroundings of the work machine 2 on the display 36 based on the image signal.
- the operator can operate the work machine 2 by operating the remote operation member 34 while viewing the image indicative of the surroundings of the work machine 2 on the display 36 .
- the mobile communication unit 4 is provided separately from the remote operation device 3 .
- the mobile communication unit 4 is configured to be operated by the operator.
- the mobile communication unit 4 includes a communication function in the same manner as the remote operation device 3 .
- the mobile communication unit 4 wirelessly communicates with the onboard controller 25 .
- the mobile communication unit 4 wirelessly communicates with the second communication device 32 of the work machine 2 .
- the mobile communication unit 4 may wirelessly communicate with the first communication device 31 of the work machine 2 .
- the mobile communication unit 4 is portable.
- the mobile communication unit 4 is carried to the work site where the work machine 2 is disposed.
- the mobile communication unit 4 is operated by the operator at the work site.
- the mobile communication unit 4 wirelessly communicates with the onboard controller 25 at a shorter distance than the remote operation device 3 .
- the operator operates the mobile communication unit 4 in a range where the work machine 2 can be visually observed.
- the mobile communication unit 4 may be a general-purpose mobile communication terminal such as a laptop computer, a tablet computer, a smart phone, or the like. Alternatively, the mobile communication unit 4 may be a dedicated terminal of the system 1 for controlling the work machine 2 .
- the mobile communication unit 4 includes an operating member, such as a switch, a lever, a touch screen, or the like.
- the mobile communication unit 4 is configured to be operated to switch the work machine 2 from a start prohibited state to a start permitted state.
- the mobile communication unit 4 transmits a start permission signal to the onboard controller 25 according to an operation by the operator.
- the start permission signal is a signal for switching the work machine 2 from the start prohibited state to the start permitted state. Processes for starting the work machine 2 will be described below.
- FIG. 3 is a flowchart illustrating processes executed by the onboard controller 25 to start the work machine 2 .
- the onboard controller 25 is already activated due to the electric power supplied from a battery mounted on the work machine 1 .
- the onboard controller 25 sets the work machine 2 in the start prohibited state.
- the onboard controller 25 sets the work machine 2 in the start prohibited state when the power source 21 is stopped and the start permission signal is not received from the mobile communication unit 4 .
- the power source 21 is prohibited from starting.
- step S 102 the onboard controller 25 determines whether the control mode of the work machine 2 is the remote operation mode.
- the onboard controller 25 determines that the control mode of the work machine 2 is the remote operation mode when the remote operation mode is set by the first mode selection member 29 and the remote operation mode is selected by the second mode selection member 30 .
- the process proceeds to step S 103 .
- step S 103 the onboard controller 25 determines whether the start permission signal has been received from the mobile communication unit 4 .
- the mobile communication unit 4 transmits the start permission signal to the onboard controller 25 according to the operation by the operator at the work site.
- the process proceeds to step S 104 .
- step S 104 the onboard controller 25 releases the start prohibited state of the work machine 2 .
- the onboard controller 25 maintains the work machine 2 in the start prohibited state.
- step S 105 the onboard controller 25 determines whether a start command signal for starting the work machine 2 has been received.
- the start command signal is transmitted from the remote operation device 3 .
- the remote operation device 3 transmits the start command signal to the onboard controller 25 according to an operation of the remote input device 35 by an operator in the management center (hereinafter referred to as a “remote operator”).
- the process proceeds to step S 106 .
- step S 106 the onboard controller 25 determines whether the work machine 2 is in the start permitted state.
- the onboard controller 25 determines that the work machine 2 is in the start permitted state when the start prohibited state of the work machine 2 is released in step S 104 .
- the onboard controller 25 may determine that the work machine 2 is in the start permitted state when another start permission condition is satisfied in addition to that the start prohibited state of the work machine 2 is released.
- the process proceeds to step S 107 .
- step S 107 the onboard controller 25 starts the work machine 2 . That is, the onboard controller 25 starts the power source 21 by driving the starter motor 24 .
- the onboard controller 25 determines that the work machine 2 is not in the start permitted state in step S 106 , the onboard controller 25 does not start the work machine 2 even in a case where the start command signal has been received from the remote operation device 3 . That is, when the work machine 2 is in the start prohibited state, the onboard controller 25 prohibits the work machine 2 from starting even in a case where the start command signal has been received from the remote operation device 3 .
- the onboard controller 25 releases the start prohibited state of the work machine 2 when the start permission signal has been received from the mobile communication unit 4 . Then, in a case where the start command signal has been received from the remote operation device 3 , the onboard controller 25 starts the work machine 2 when the work machine 2 is in the start permitted state. However, when the work machine 2 is in the start prohibited state, the onboard controller 25 prohibits the work machine 2 from starting even in a case where the start command signal has been received from the remote operation device 3 .
- the operator at the work site when the operator at the work site is performing work on the work machine 2 , such as maintenance work, troubleshooting, judging the suitability of safety around the work machine 2 , or making preparations to ensure safety, the start of the work machine 2 is prohibited until the operator at the work site operates the mobile communication unit 4 to release the start prohibited state of the work machine 2 . Accordingly, even if the remote operator operates the remote operation device 3 to transmit the start command signal to the work machine 2 , the work machine 2 does not start. As a result, the operator at the work site can smoothly perform work on the work machine 2 .
- the operator at the work site After completing the above work on the work machine 2 , the operator at the work site operates the first mode selection member 29 in the operating cabin 14 to set the control mode of the work machine 2 to the remote operation mode. The operator at the work site gets off the work machine 2 and operates the second mode selection member 30 to select the remote operation mode. After leaving the work machine 2 , the operator at the work site operates the mobile communication unit 4 to release the start prohibited state of the work machine 2 .
- the remote operator operates the remote operation device 3 to transmit the start command signal to the work machine 2 , thereby causing the work machine 2 to start. Subsequently, the remote operator operates the remote operation member 34 to perform work at the work site with the work machine 2 .
- the work machine 2 to be started by the remote operation can be started at an appropriate timing according to the condition of the work machine 2 .
- the work machine 2 is not limited to a bulldozer and may be another vehicle, such as a wheel loader, a motor grader, a dump truck, or the like.
- the number of the work machine controlled by the system 1 is not limited to one and may be two or more.
- the power source 21 may be an electric motor. In this case, starting the work machine 2 may be starting the travel of the work machine 2 , the motion of the work implement 13 , or the like. Alternatively, the power source 21 may be a hybrid of the internal combustion engine and the electric motor.
- the setting of the remote operation mode by the first mode selection member 29 may be omitted.
- the selection of the remote operation mode by the second mode selection member 30 may be omitted.
- the first mode selection member 29 and the second mode selection member 30 may be disposed on the outer surface of the work machine 2 .
- the first mode selection member 29 and the second mode selection member 30 may be disposed in the operating cabin 14 .
- the onboard controller 25 releases the start prohibited state of the work machine 2 when the start permission signal has been received from the mobile communication unit 4 .
- the mobile communication unit 4 may transmit a start non-permission signal to the onboard controller 25 .
- the onboard controller 25 may maintain the work machine 2 in the start prohibited state while the start non-permission signal is received from the mobile communication unit 4 .
- the mobile communication unit 4 may stop the start non-permission signal according to the operation by the operator.
- the onboard controller 25 may release the start prohibited state of the work machine 2 in a case where the transmission of the start non-permission signal is stopped.
- the communication unit according to the present invention is not limited to the mobile communication unit 4 described above and may be changed.
- the start permission signal may be transmitted to the onboard controller 25 by a communication unit provided at a base of the site, instead of the mobile communication unit 4 .
- the operator at the work site may operate the communication unit to release the start prohibited state of the work machine 2 after returning to the base of the site.
- the operator at the work site may contact the base of the site and thus an operator at the base of the site may operate the communication unit to release the start prohibited state of the work machine 2 .
- a notification means such as a lamp, indicating that the work machine 2 is in the start prohibited state or released from the start prohibited state may be provided in the operating cabin 14 of the work machine 1 , on the outer surface of the work machine 1 , on the remote operation device 3 , or the like.
- the work machine to be started by the remote operation can be started at an appropriate timing according to a condition of the work machine.
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)
- Lifting Devices For Agricultural Implements (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
A system includes an onboard controller, a remote operation device, and a communication unit. The remote operation device transmits a start command signal for starting the work machine to the work machine. The communication unit communicates with the onboard controller. The communication unit is configured to be operated to switch the work machine from a start prohibited state to a start permitted state. The onboard controller switches the work machine from the start prohibited state to the start permitted state according to an operation of the communication unit. The onboard controller prohibits the work machine from starting when the work machine is in the start prohibited state upon receiving the start command signal from the remote operation device. The onboard controller starts the work machine when the work machine is in the start permitted state upon receiving the start command signal from the remote operation device.
Description
- This application is a U.S. National stage application of International Application No. PCT/JP2022/017987, filed on Apr. 18, 2022. This U.S. National stage application claims priority under 35 U.S.C. § 119(a) to Japanese Patent Application No. 2021-106041, filed in Japan on Jun. 25, 2021, the entire contents of which are hereby incorporated herein by reference.
- The present disclosure relates to a system and a method for controlling a work machine.
- Some work machines can be started by a remote operation. For example, a construction machine vehicle in Japanese Unexamined Patent Publication No. H08-156715 checks whether a predetermined condition is satisfied upon receiving a command signal from a transmitter, and starts an engine if the predetermined condition is satisfied. The predetermined condition includes, for example, the fact that the engine is stopped, the fact that a shift lever is in a neutral position, the fact that a parking brake is in an operating position, the fact that a door for the driver's seat is closed, or the like.
- Conditions in which a work machine is started are varied and not always the same. For example, there is a case where a work machine is started in order to start normal work at a work site or a case where maintenance work or troubleshooting is performed on the work machine. However, it is not easy to accurately understand a condition in which the work machine is started from a remote place.
- For example, in a case where the work machine is remotely controlled at a management center that is far away from the work machine, it is difficult to accurately understand a condition of the work machine since the work machine and its surroundings cannot be visually observed. In addition, determining whether to start the engine based only on a predetermined condition as described above is not always suitable for the condition of the work machine. An object of the present disclosure is to start a work machine to be started by a remote operation at an appropriate timing according to a condition of the work machine.
- A system according to one aspect of the present disclosure is a system for controlling a work machine. The system includes an onboard controller, a remote operation device, and a communication unit. The onboard controller is mounted on the work machine and controls the work machine. The remote operation device communicates with the onboard controller. The remote operation device transmits a start command signal for starting the work machine to the work machine. The communication unit is provided separately from the remote operation device. The communication unit communicates with the onboard controller. The communication unit is configured to be operated to switch the work machine from a start prohibited state to a start permitted state.
- The onboard controller switches the work machine from the start prohibited state to the start permitted state according to an operation of the communication unit. The onboard controller prohibits the work machine from starting when the work machine is in the start prohibited state, even in a case where the start command signal has been received from the remote operation device. The onboard controller starts the work machine when the work machine is in the start permitted state, in a case where the start command signal has been received from the remote operation device.
- A method according to another aspect of the present disclosure is a method for controlling a work machine. The method includes communicating with a communication unit, switching the work machine from a start prohibited state to a start permitted state according to an operation of the communication unit, communicating with a remote operation device, determining whether a start command signal for the work machine has been received from the remote operation device, starting the work machine when the work machine is in the start permitted state in a case where the start command signal has been received from the remote operation device, and, prohibiting the work machine from starting when the work machine is in the start prohibited state even in a case where the start command signal has been received from the remote operation device.
- In the system and method according to the present disclosure, when an operator at a work site is performing work on the work machine, the work machine is prohibited from starting until the operator at the work site operates the communication unit to switch the work machine from the start prohibited state to the start permitted state. Therefore, even if a remote operator operates the remote operation device to transmit the start command signal to the work machine, the work machine does not start.
- The operator at the work site operates the communication unit to switch the work machine from the start prohibited state to the start permitted state after completing the work on the work machine. Accordingly, the remote operator operates the remote operation device to transmit the start command signal to the work machine, whereby the work machine starts. As a result, in the system and method according to the present disclosure, the work machine to be started by the remote operation can be started at an appropriate timing according to a condition of the work machine.
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FIG. 1 is a block diagram illustrating a configuration of a system for controlling a work machine according to an embodiment. -
FIG. 2 is a perspective view of the work machine. -
FIG. 3 is a flowchart illustrating processes for starting the work machine executed by an onboard controller. - A system for controlling a work machine according to an embodiment will be described below with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration of asystem 1 according to the embodiment. Thesystem 1 according to the present embodiment includes awork machine 2, aremote operation device 3, and a mobile communication unit 4. Thework machine 2 is disposed at a work site, such as a mine. Thework machine 2 is a bulldozer, for example. -
FIG. 2 is a perspective view of thework machine 2. As illustrated inFIG. 2 , thework machine 2 includes abody 10 and a work implement 13. Thebody 10 includes avehicle body 11 and atravel device 12. Thevehicle body 11 includes anoperating cabin 14 and apower compartment 15. An operator's seat that is not illustrated is disposed in theoperating cabin 14. Thepower compartment 15 is disposed in front of theoperating cabin 14. Thetravel device 12 is attached to a lower portion of thevehicle body 11. Thetravel device 12 includes a pair of left andright crawler belts 16. Only theleft crawler belt 16 is illustrated inFIG. 1 . Thework machine 2 travels due to the rotation of thecrawler belts 16. - The
work implement 13 is attached to thebody 10. Thework implement 13 includes alift frame 17, ablade 18 and alift cylinder 19. Thelift frame 17 is attached to thetravel device 12 so as to be movable up and down. Thelift frame 17 supports theblade 18. Theblade 18 is disposed in front of thevehicle body 11. Thelift cylinder 19 is coupled to thevehicle body 11. The front end of thelift cylinder 19 is rotatably attached to a back surface of theblade 18. Theblade 18 moves up and down due to the extension and contraction of thelift cylinder 19. - As illustrated in
FIG. 1 , thework machine 2 includes apower source 21, ahydraulic pump 22, and apower transmission device 23. In the present embodiment, thepower source 21 is an internal combustion engine. Astarter motor 24 is connected to thepower source 21. Thestarter motor 24 starts thepower source 21. Thehydraulic pump 22 is driven by thepower source 21 to discharge hydraulic fluid. The hydraulic fluid discharged from thehydraulic pump 22 is supplied to thelift cylinder 19. Although one hydraulic pump is illustrated inFIG. 2 , a plurality of hydraulic pumps may be provided. - The
power transmission device 23 transmits driving force of thepower source 21 to thetravel device 12. Thepower transmission device 23 may be a hydro static transmission (HST), for example. Alternatively, thepower transmission device 23 may be, for example, a transmission having a torque converter or a plurality of transmission gears. - The
work machine 2 includes anonboard controller 25 and acontrol valve 26. Theonboard controller 25 is mounted on thework machine 2. Theonboard controller 25 is implemented by a computer including a processor and a memory. Theonboard controller 25 may be configured by a plurality of controllers separate from one another. Theonboard controller 25 is programmed to control thework machine 2 based on acquired data. - The
control valve 26 is a proportional control valve and is controlled by a command signal from theonboard controller 25. Thecontrol valve 26 is disposed between thehydraulic pump 22 and a hydraulic actuator such as thelift cylinder 19. Thecontrol valve 26 controls the flow rate of the hydraulic fluid supplied from thehydraulic pump 22 to thelift cylinder 19. Theonboard controller 25 controls thecontrol valve 26 so that the work implement 13 is raised or lowered. Thecontrol valve 26 may be a pressure proportional control valve. Alternatively, thecontrol valve 26 may be an electromagnetic proportional control valve. - The
work machine 2 includes acamera 27, anonboard operating member 28, a firstmode selection member 29, and a secondmode selection member 30. Thecamera 27 is attached to thevehicle body 11, for example. Thecamera 27 acquires an image of the surroundings of thework machine 2. Thecamera 27 transmits an image signal indicative of the image of the surroundings of thework machine 2 to theonboard controller 25. - The
onboard operating member 28 is disposed in the operatingcabin 14. Theonboard operating member 28 is configured to be operated by an operator to cause thework machine 2 to travel. Further, theonboard operating member 28 is configured to be operated by the operator to cause the work implement 13 to move. Theonboard operating member 28 includes an operating lever, for example. Theonboard operating member 28 may include another operating member such as a pedal, a switch, a touch screen, or the like. - The
onboard operating member 28 transmits an operation signal indicative of an operation by the operator to theonboard controller 25. Theonboard controller 25 controls thepower source 21 and thepower transmission device 23 according to the operation signal, thereby causing thework machine 2 to travel. Theonboard controller 25 controls thehydraulic pump 22 and thecontrol valve 26 according to the operation signal, thereby causing the work implement 13 to move. - The first
mode selection member 29 is disposed in the operatingcabin 14. The firstmode selection member 29 is configured to be operated by the operator to set a control mode of thework machine 2. The firstmode selection member 29 is, for example, a touch screen type input device. The firstmode selection member 29 may be another input device, such as a switch. The firstmode selection member 29 transmits an input signal indicative of an operation by the operator to theonboard controller 25. - The control mode includes a direct operation mode and a remote operation mode. In the direct operation mode, the
onboard controller 25 controls thework machine 2 according to the operation signal from theonboard operating member 28. Therefore, in the direct operation mode, the operator operates theonboard operating member 28, thereby causing thework machine 2 to move. In the remote operation mode, thework machine 2 is controlled according to a remote control signal from theremote operation device 3. Therefore, in the remote operation mode, the operator operates theremote operation device 3, thereby causing thework machine 2 to move. - The second
mode selection member 30 is attached to thework machine 2. The secondmode selection member 30 is configured to be operated by the operator to select the remote operation mode as the control mode forwork machine 2. The secondmode selection member 30 is a switch, for example. Alternatively, the secondmode selection member 30 may be another member, such as a lever, a touch screen, or the like. The secondmode selection member 30 is disposed on an outer surface of thework machine 2. For example, the secondmode selection member 30 is disposed at a position on thework machine 2 where an operator on the ground can operate. For example, the secondmode selection member 30 may be disposed at a height of 2000 mm or less on a lower part of the rear portion of thevehicle body 11. The secondmode selection member 30 transmits a selection signal indicative of an operation by the operator to theonboard controller 25. - The
work machine 2 includes afirst communication device 31 and asecond communication device 32. Thefirst communication device 31 and thesecond communication device 32 are mounted on thework machine 2. Thefirst communication device 31 wirelessly communicates with theremote operation device 3. Thesecond communication device 32 wirelessly communicates with the mobile communication unit 4. The communication methods of thefirst communication device 31 and thesecond communication device 32 may be same or different from each other. Thework machine 2 and theremote operation device 3 may communicate with each other directly or via a control system or the like. - The
remote operation device 3 is disposed in a management center away from the work site. An operator in the management center can remotely operate thework machine 2 by operating theremote operation device 3. Theremote operation device 3 includes acommunication device 33, aremote operation member 34, aremote input device 35, adisplay 36 and aremote controller 37. Thecommunication device 33 wirelessly communicates with thefirst communication device 31 of thework machine 2. - The
remote operation member 34 is configured to be operated by the operator to cause thework machine 2 to travel in the same manner as theonboard operating member 28. Further, theremote operation member 34 is configured to be operated by the operator to cause the work implement 13 to move in the same manner as theonboard operating member 28. Theremote operation member 34 includes, for example, an operating lever. Theremote operation member 34 may include another operating member, such as a pedal, a switch, a touch screen, or the like. Theremote operation member 34 transmits an operation signal indicative of an operation by the operator to theremote controller 37. - The
remote input device 35 is configured to be operated by the operator to input a setting of thework machine 2. Theremote input device 35 is, for example, a touch screen type input device. Theremote input device 35 may be another input device, such as a switch. Theremote input device 35 transmits an input signal indicative of an operation by the operator to theremote controller 37. - The
remote controller 37 is implemented by a computer including a processor and a memory. Theremote controller 37 may be configured by a plurality of controllers separate from one another. Theremote controller 37 transmits a remote control signal to theonboard controller 25 via thecommunication device 33. Theremote controller 37 generates the remote control signal based on the operation signal from theremote operation member 34 or the input signal from theremote input device 35. - The
onboard controller 25 controls thepower source 21 and thepower transmission device 23 according to the remote control signal from theremote controller 37, thereby causing thework machine 2 to travel. Theonboard controller 25 controls thehydraulic pump 22 and thecontrol valve 26 according to the remote control signal from theremote controller 37, thereby causing the work implement 13 to move. - The
onboard controller 25 transmits the image signal from thecamera 27 to theremote controller 37. Theremote controller 37 displays the image indicative of the surroundings of thework machine 2 on thedisplay 36 based on the image signal. The operator can operate thework machine 2 by operating theremote operation member 34 while viewing the image indicative of the surroundings of thework machine 2 on thedisplay 36. - The mobile communication unit 4 is provided separately from the
remote operation device 3. The mobile communication unit 4 is configured to be operated by the operator. The mobile communication unit 4 includes a communication function in the same manner as theremote operation device 3. The mobile communication unit 4 wirelessly communicates with theonboard controller 25. Specifically, the mobile communication unit 4 wirelessly communicates with thesecond communication device 32 of thework machine 2. Alternatively, the mobile communication unit 4 may wirelessly communicate with thefirst communication device 31 of thework machine 2. - The mobile communication unit 4 is portable. The mobile communication unit 4 is carried to the work site where the
work machine 2 is disposed. The mobile communication unit 4 is operated by the operator at the work site. The mobile communication unit 4 wirelessly communicates with theonboard controller 25 at a shorter distance than theremote operation device 3. The operator operates the mobile communication unit 4 in a range where thework machine 2 can be visually observed. - The mobile communication unit 4 may be a general-purpose mobile communication terminal such as a laptop computer, a tablet computer, a smart phone, or the like. Alternatively, the mobile communication unit 4 may be a dedicated terminal of the
system 1 for controlling thework machine 2. The mobile communication unit 4 includes an operating member, such as a switch, a lever, a touch screen, or the like. - The mobile communication unit 4 is configured to be operated to switch the
work machine 2 from a start prohibited state to a start permitted state. The mobile communication unit 4 transmits a start permission signal to theonboard controller 25 according to an operation by the operator. The start permission signal is a signal for switching thework machine 2 from the start prohibited state to the start permitted state. Processes for starting thework machine 2 will be described below. -
FIG. 3 is a flowchart illustrating processes executed by theonboard controller 25 to start thework machine 2. When thework machine 2 being started, theonboard controller 25 is already activated due to the electric power supplied from a battery mounted on thework machine 1. As illustrated inFIG. 3 , in step S101, theonboard controller 25 sets thework machine 2 in the start prohibited state. Theonboard controller 25 sets thework machine 2 in the start prohibited state when thepower source 21 is stopped and the start permission signal is not received from the mobile communication unit 4. When thework machine 2 is in the start prohibited state, thepower source 21 is prohibited from starting. - In step S102, the
onboard controller 25 determines whether the control mode of thework machine 2 is the remote operation mode. Theonboard controller 25 determines that the control mode of thework machine 2 is the remote operation mode when the remote operation mode is set by the firstmode selection member 29 and the remote operation mode is selected by the secondmode selection member 30. When theonboard controller 25 determines that the control mode of thework machine 2 is the remote operation mode, the process proceeds to step S103. - In step S103, the
onboard controller 25 determines whether the start permission signal has been received from the mobile communication unit 4. The mobile communication unit 4 transmits the start permission signal to theonboard controller 25 according to the operation by the operator at the work site. When theonboard controller 25 determines that the start permission signal has been received from the mobile communication unit 4, the process proceeds to step S104. - In step S104, the
onboard controller 25 releases the start prohibited state of thework machine 2. In a case where the start permission signal is not received from the mobile communication unit 4 in step S103, theonboard controller 25 maintains thework machine 2 in the start prohibited state. - In step S105, the
onboard controller 25 determines whether a start command signal for starting thework machine 2 has been received. The start command signal is transmitted from theremote operation device 3. Theremote operation device 3 transmits the start command signal to theonboard controller 25 according to an operation of theremote input device 35 by an operator in the management center (hereinafter referred to as a “remote operator”). When theonboard controller 25 receives the start command signal, the process proceeds to step S106. - In step S106, the
onboard controller 25 determines whether thework machine 2 is in the start permitted state. Theonboard controller 25 determines that thework machine 2 is in the start permitted state when the start prohibited state of thework machine 2 is released in step S104. Alternatively, theonboard controller 25 may determine that thework machine 2 is in the start permitted state when another start permission condition is satisfied in addition to that the start prohibited state of thework machine 2 is released. When theonboard controller 25 determines that thework machine 2 is in the start permitted state, the process proceeds to step S107. In step S107, theonboard controller 25 starts thework machine 2. That is, theonboard controller 25 starts thepower source 21 by driving thestarter motor 24. - When the
onboard controller 25 determines that thework machine 2 is not in the start permitted state in step S106, theonboard controller 25 does not start thework machine 2 even in a case where the start command signal has been received from theremote operation device 3. That is, when thework machine 2 is in the start prohibited state, theonboard controller 25 prohibits thework machine 2 from starting even in a case where the start command signal has been received from theremote operation device 3. - In the
system 1 according to the present embodiment described above, theonboard controller 25 releases the start prohibited state of thework machine 2 when the start permission signal has been received from the mobile communication unit 4. Then, in a case where the start command signal has been received from theremote operation device 3, theonboard controller 25 starts thework machine 2 when thework machine 2 is in the start permitted state. However, when thework machine 2 is in the start prohibited state, theonboard controller 25 prohibits thework machine 2 from starting even in a case where the start command signal has been received from theremote operation device 3. - Therefore, when the operator at the work site is performing work on the
work machine 2, such as maintenance work, troubleshooting, judging the suitability of safety around thework machine 2, or making preparations to ensure safety, the start of thework machine 2 is prohibited until the operator at the work site operates the mobile communication unit 4 to release the start prohibited state of thework machine 2. Accordingly, even if the remote operator operates theremote operation device 3 to transmit the start command signal to thework machine 2, thework machine 2 does not start. As a result, the operator at the work site can smoothly perform work on thework machine 2. - After completing the above work on the
work machine 2, the operator at the work site operates the firstmode selection member 29 in the operatingcabin 14 to set the control mode of thework machine 2 to the remote operation mode. The operator at the work site gets off thework machine 2 and operates the secondmode selection member 30 to select the remote operation mode. After leaving thework machine 2, the operator at the work site operates the mobile communication unit 4 to release the start prohibited state of thework machine 2. - Accordingly, the remote operator operates the
remote operation device 3 to transmit the start command signal to thework machine 2, thereby causing thework machine 2 to start. Subsequently, the remote operator operates theremote operation member 34 to perform work at the work site with thework machine 2. As described above, in thesystem 1 according to the present embodiment, thework machine 2 to be started by the remote operation can be started at an appropriate timing according to the condition of thework machine 2. - Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications may be made without departing from the gist of the invention.
- The
work machine 2 is not limited to a bulldozer and may be another vehicle, such as a wheel loader, a motor grader, a dump truck, or the like. The number of the work machine controlled by thesystem 1 is not limited to one and may be two or more. Thepower source 21 may be an electric motor. In this case, starting thework machine 2 may be starting the travel of thework machine 2, the motion of the work implement 13, or the like. Alternatively, thepower source 21 may be a hybrid of the internal combustion engine and the electric motor. - The setting of the remote operation mode by the first
mode selection member 29 may be omitted. The selection of the remote operation mode by the secondmode selection member 30 may be omitted. The firstmode selection member 29 and the secondmode selection member 30 may be disposed on the outer surface of thework machine 2. Alternatively, the firstmode selection member 29 and the secondmode selection member 30 may be disposed in the operatingcabin 14. - In the above embodiment, the
onboard controller 25 releases the start prohibited state of thework machine 2 when the start permission signal has been received from the mobile communication unit 4. However, the mobile communication unit 4 may transmit a start non-permission signal to theonboard controller 25. Theonboard controller 25 may maintain thework machine 2 in the start prohibited state while the start non-permission signal is received from the mobile communication unit 4. The mobile communication unit 4 may stop the start non-permission signal according to the operation by the operator. Theonboard controller 25 may release the start prohibited state of thework machine 2 in a case where the transmission of the start non-permission signal is stopped. - The communication unit according to the present invention is not limited to the mobile communication unit 4 described above and may be changed. For example, the start permission signal may be transmitted to the
onboard controller 25 by a communication unit provided at a base of the site, instead of the mobile communication unit 4. In this case, the operator at the work site may operate the communication unit to release the start prohibited state of thework machine 2 after returning to the base of the site. Alternatively, the operator at the work site may contact the base of the site and thus an operator at the base of the site may operate the communication unit to release the start prohibited state of thework machine 2. - A notification means, such as a lamp, indicating that the
work machine 2 is in the start prohibited state or released from the start prohibited state may be provided in the operatingcabin 14 of thework machine 1, on the outer surface of thework machine 1, on theremote operation device 3, or the like. - In the system and method according to the present disclosure, the work machine to be started by the remote operation can be started at an appropriate timing according to a condition of the work machine.
Claims (10)
1. A system for controlling a work machine, the system comprising:
an onboard controller mounted on the work machine and configured to control the work machine;
a remote operation device configured to communicate with the onboard controller and transmit a start command signal for starting the work machine to the work machine; and
a communication unit provided separately from the remote operation device, the communication unit being configured to communicate with the onboard controller and to be operated to switch the work machine from a start prohibited state to a start permitted state;
the onboard controller being further configured to
switch the work machine from the start prohibited state to the start permitted state according to an operation of the communication unit,
prohibit the work machine from starting when the work machine is in the start prohibited state upon receiving the start command signal from the remote operation device, and
start the work machine when the work machine is in the start permitted state upon receiving the start command signal from the remote operation device.
2. The system according to claim 1 , further comprising
a mode selection member mounted on the work machine and configured to be operated to select a remote operation mode of the work machine,
the onboard controller being further configured to start the work machine when the remote operation mode is selected by the mode selection member and when the work machine is in the start permitted state upon receiving the start command signal from the remote operation device.
3. The system according to claim 2 , wherein
the onboard controller is further configured to prohibit the work machine from starting with the work machine in the start prohibited state upon selecting the remote operation mode by the mode selection member.
4. The system according to claim 1 , wherein
the communication unit is further configured to transmit a start permission signal for switching the work machine from the start prohibited state to the start permitted state to the onboard controller, and
the onboard controller is configured to switch the work machine from the start prohibited state to the start permitted state upon receiving the start permission signal.
5. The system according to claim 1 , wherein
the communication unit is further configured to transmit a start non-permission signal for maintaining the work machine in the start prohibited state to the onboard controller,
the communication unit is further configured to stop transmission of the start non-permission signal according to an operation by an operator, and
the onboard controller is further configured to switch the work machine from the start prohibited state to the start permitted state upon stopping the transmission of the start non-permission signal.
6. A method for controlling a work machine, the method comprising:
communicating with a communication unit;
switching the work machine from a start prohibited state to a start permitted state according to an operation of the communication unit;
communicating with a remote operation device;
determining whether a start command signal of the work machine has been received from the remote operation device;
starting the work machine when the work machine is in the start permitted state upon receiving the start command signal from the remote operation device; and
prohibiting the work machine from starting when the work machine is in the start prohibited state upon receiving the start command signal from the remote operation device.
7. The method according to claim 6 , further comprising
determining whether a remote operation mode of the work machine is selected by a mode selection member mounted on the work machine; and
starting the work machine when the remote operation mode is selected by the mode selection member and when the work machine is in the start permitted state upon receiving the start command signal from the remote operation device.
8. The method according to claim 7 , further comprising
prohibiting the work machine from starting with the work machine in the start prohibited state upon selecting the remote operation mode by the mode selection member.
9. The method according to claim 6 , wherein
the communication unit is configured to transmit a start permission signal for switching the work machine from the start prohibited state to the start permitted state according to an operation by an operator, the method further comprising
determining whether the start permission signal has been received from the communication unit; and
switching the work machine from the start prohibited state to the start permitted state upon receiving the start permission signal.
10. The method according to claim 6 , wherein
the communication unit is configured to transmit a start non-permission signal for maintaining the work machine in the start prohibited state to the onboard controller, and
the communication unit is further configured to stop the start non-permission signal according to an operation by an operator, the method further comprising
determining whether the start non-permission signal has been stopped; and
switching the work machine from the start prohibited state to the start permitted state upon stopping the start non-permission signal.
Applications Claiming Priority (3)
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JP2021106041A JP2023004406A (en) | 2021-06-25 | 2021-06-25 | System and method for controlling work machine |
JP2021-106041 | 2021-06-25 | ||
PCT/JP2022/017987 WO2022270136A1 (en) | 2021-06-25 | 2022-04-18 | System and method for controlling work machine |
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US20240159016A1 true US20240159016A1 (en) | 2024-05-16 |
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US18/282,355 Pending US20240159016A1 (en) | 2021-06-25 | 2022-04-18 | System and method for controlling work machine |
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JP (1) | JP2023004406A (en) |
AU (1) | AU2022297925A1 (en) |
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JPH06228988A (en) * | 1993-01-29 | 1994-08-16 | Hitachi Constr Mach Co Ltd | Locking mechanism of hydraulic machine |
JP5959885B2 (en) * | 2012-03-08 | 2016-08-02 | 住友建機株式会社 | Excavator |
JP6913343B2 (en) * | 2017-03-22 | 2021-08-04 | コーワテック株式会社 | Stop device |
JP6966418B2 (en) * | 2018-12-28 | 2021-11-17 | 日立建機株式会社 | Wireless excavator |
JP7256687B2 (en) * | 2019-05-23 | 2023-04-12 | 日本車輌製造株式会社 | Pile driver safety system |
JP7341396B2 (en) * | 2019-12-03 | 2023-09-11 | コベルコ建機株式会社 | Remote operation support server and remote operation support system |
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- 2022-04-18 WO PCT/JP2022/017987 patent/WO2022270136A1/en active Application Filing
- 2022-04-18 AU AU2022297925A patent/AU2022297925A1/en active Pending
- 2022-04-18 US US18/282,355 patent/US20240159016A1/en active Pending
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JP2023004406A (en) | 2023-01-17 |
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