Display device, method for recovering display device, and work machine

Abstract

Even in the event of a software malfunction that prevents start-up, the malfunction can be addressed without replacing a control unit of a display device. A work machine (1) is provided with a bird's-eye view image display device (20), which is an example of a display device. This bird's-eye view image display device comprises a monitor (22) for bird's-eye view images and a calculation unit (21) for screen display, and the calculation unit for screen display is provided with a first processing unit (211) for controlling a screen display function and a second processing unit (212) for controlling a predetermined function other than the screen display function. The second processing unit issues a notification of a malfunction to a work machine control unit (10), which is an example of another type of equipment, when the first processing unit has malfunctioned, and causes the first processing unit to transition to a recovery mode when an indication is received from the work machine control unit that indicates a transition to a recovery mode in which software recovery is achievable by an external storage medium (40).

Description

Display device, display device recovery method, and work machine

[0001] The present invention relates to a display device mounted on a work machine, a method for recovering the display device, and the work machine.

[0002] A conventional technique for displaying an overhead image, which is created by stitching together images captured by multiple cameras mounted on a work machine such as a construction machine, on a display device installed in a driver's cab is known (see, for example, Patent Document 1). The display device includes a monitor unit and a screen display calculation unit, which is a control unit that controls the monitor unit.

[0003] Japanese Patent Application Publication No. 2021-30804

[0004] However, display devices installed in the driver's cab may experience problems that prevent them from starting, such as a screen not displaying anything. Causes of such problems include a problem with the monitor unit or a problem with the screen display calculation unit. Problems with the screen display calculation unit may be hardware or software problems.

[0005] To resolve the software issue, the screen display calculation unit must be put into a recovery mode, which allows recovery using an external storage medium. However, because the screen is not displayed, it is not possible to issue a command to enter recovery mode.

[0006] Therefore, in the past, when there was a problem with the screen display calculation unit, even if it was a software problem, the measure taken was to replace the entire screen display calculation unit, including the hardware that was not causing the problem, and there is room for improvement.

[0007] One aspect of the present disclosure aims to provide a display device for a work machine, a recovery method for a display device for a work machine, and a work machine that can resolve a malfunction without replacing the control unit of the display device, even if a malfunction occurs in the software that makes it unable to start.

[0008] In order to solve the above problems, a display device according to one embodiment of the present disclosure is a display device mounted on a work machine, and comprises a monitor unit and a first control unit that controls each unit of the display device, wherein the first control unit comprises a first processing unit that controls a screen display function on the monitor unit, and a second processing unit that controls a predetermined function other than the screen display function, and when a malfunction occurs in the first processing unit, the second processing unit notifies a predetermined other device of the malfunction, and receives an instruction from the predetermined other device to transition to a recovery mode that enables software recovery using an external storage medium, thereby transitioning the first processing unit to the recovery mode.

[0009] A recovery method for a display device according to one aspect of the present disclosure is a recovery method for a display device mounted on a work machine, wherein the display device comprises a monitor unit and a first control unit that controls each unit of the display device, the first control unit comprises a first processing unit that controls a screen display function on the monitor unit and a second processing unit that controls a predetermined function other than the screen display function, and the work machine comprises a second control unit that controls each unit of the work machine, and includes a notification step in which the second processing unit notifies the second control unit of the occurrence of a malfunction in the first control unit when a malfunction occurs in the first processing unit, a command step in which the second control unit sends an instruction to the first control unit from the second control unit when the second control unit receives the notification of the occurrence of the malfunction in the first processing unit, instructing the first control unit to transition to a recovery mode that enables software recovery using an external storage medium, and a command transmission step in which the second processing unit transitions the first processing unit to the recovery mode when the instruction to transition to the recovery mode is received.

[0010] According to one aspect of the present disclosure, it is possible to realize a display device for a work machine, a recovery method for a display device for a work machine, and a work machine that can resolve a malfunction that prevents the software from starting without replacing the control unit of the display device, even if a malfunction occurs in the software that prevents the software from starting.

[0011] 1 is a schematic perspective view showing the overall configuration of a work machine according to an embodiment of the present invention. FIG. 2 is a perspective view showing a part of the front side of the interior of a cabin in the work machine shown in FIG. 1. FIG. 3 is a block diagram showing a schematic configuration of a main part of the work machine shown in FIG. 1. FIG. 4 is a flowchart showing the flow of processing in the work machine shown in FIG. 1 when a malfunction occurs in the first processing unit that makes it unable to start, up to the point where the malfunction is recovered. FIG. 5 is a continuation of the flowchart of FIG.

[0012] [First Embodiment] Hereinafter, one embodiment of the present invention will be described in detail. In this embodiment, an overhead image display device is exemplified as an example of a display device mounted on a work machine.

[0013] 1 is a schematic perspective view showing the overall configuration of a work machine 1 according to this embodiment. In this embodiment, the work machine 1 is exemplified by a backhoe, which is one type of construction machine.

[0014] As shown in Figure 1, the work machine 1 includes a traveling device 2, a revolving body 3, and a working device 4. The revolving body 3 is supported on the frame of the traveling device 2 via a bearing body so as to be able to rotate about a vertical axis (an axis in the up-down direction). The revolving body 3 includes the working device 4, a cabin (operator's compartment) 5, a prime mover 6, a hood 7, a counterweight 8, etc.

[0015] The cabin 5 has a driver's seat inside where an operator (driver) sits. In the following description, the front side of the operator seated in the driver's seat will be referred to as the front, the rear side of the operator as the rear, the left side of the operator as the left side, and the right side of the operator as the right side. The cabin 5 is installed to the left of the rotating body 3.

[0016] The prime mover 6 is located at the rear of the revolving unit 3 and is covered by a hood 7. The counterweight 8 is a weight for balancing the weight with the working device 4 and is located below (below) the hood 7. The working device 4 is a device that operates using hydraulic pressure as a working fluid pressure and is installed at the front of the work machine 1, specifically at the front of the revolving unit 3. The working device 4 performs work such as excavation and ground leveling.

[0017] (Interior of Cabin) Fig. 2 is a perspective view showing a portion of the front side of the interior of the cabin 5. As shown in Fig. 2, inside the cabin 5, a main monitor (alert unit) 11 and an overhead image monitor (monitor component) 22 are installed in front of a driver's seat (not shown). The main monitor 11 is connected to a work machine control unit 10 (described later), and displays various information and the like under the control of the work machine control unit 10. The overhead image monitor 22 is a monitor of an overhead image display device 20 (described later), and displays an overhead image of the surroundings of the work machine 1 under the control of a screen display calculation unit 21.

[0018] (Block diagram of work machine) Figure 3 is a block diagram that shows a schematic configuration of the main parts of the work machine 1 according to this embodiment. As shown in Figure 3, the work machine 1 includes a work machine control unit 10, the main monitor 11 described above, an anti-theft device 12, a communication unit 13, an instruction input unit 14, an overhead image display device 20, and the like.

[0019] The work machine control unit (second control unit, other specified device) 10 is an ECU that controls each part of the work machine 1. The work machine control unit 10 is connected to each device of the work machine 1, including the overhead image display device 20, via an in-vehicle network 30 such as a CAN (Controller Area Network).

[0020] The main monitor 11 is a notification unit that notifies the user of information and displays various types of information under the control of the work machine control unit 10.

[0021] The anti-theft device 12 is a device mounted on the work machine 1 to prevent theft of the work machine 1. Examples of the anti-theft device 12 include a device that disables starting of the engine with any key other than an authenticated key, or a device that requires the operator to input an anti-theft password and disables starting of the engine if the password does not match. The configuration of the anti-theft device 12 is not particularly limited.

[0022] The communication unit 13 enables communication between the work machine 1 and the external device 50. The communication unit 13 transmits and receives signals to and from the external device 50 by wireless communication or wired communication. The communication unit 13 is configured by hardware such as an integrated circuit device or an electric circuit made up of individual components.

[0023] The instruction input unit 14 accepts an external operation input to the work machine 1. The instruction input unit 14 may be an operation panel provided on the work machine 1, a predetermined switch, or the like, or may be a unit that accepts an operation input from another device that is communicatively connected.

[0024] The overhead image display device 20 is an example of a display device mounted on the work machine 1, and is equipped with the above-mentioned overhead image monitor 22, a screen display calculation unit 21, a memory unit 23, an input / output port (connection unit) 24, etc.

[0025] The screen display calculation unit (first control unit) 21 controls each unit of the overhead image display device 20. The screen display calculation unit 21 is connected to the work machine control unit 10 via an in-vehicle network 30. Although not shown, captured images for generating an overhead image of the periphery of the work machine 1 are input to the overhead image display device 20 from a plurality of cameras installed on the work machine 1.

[0026] The screen display calculation unit 21 includes a first processing unit 211 and a second processing unit 212. The first processing unit 211 controls the screen display function, and controls the overhead image monitor 22 to display an overhead image, etc. The second processing unit 212 controls predetermined functions other than the screen display function controlled by the first processing unit 211. In this embodiment, the second processing unit 212 controls the power supply, communication, etc. of the screen display calculation unit 21. The first processing unit 211 and the second processing unit 212 are configured to be able to communicate with each other.

[0027] The storage unit 23 stores any information required by the overhead image display device 20. The information stored in the storage unit 23 may be written by the first processing unit 211 and / or the second processing unit 212, and may be read by the first processing unit 211 and / or the second processing unit 212.

[0028] The input / output port 24 enables connection between the screen display calculation unit 21 and an external storage medium 40. The external storage medium 40 stores a program for causing the first processing unit 211 to execute software recovery processing (processing for initializing the software to the factory default state or processing for restoring the software to a predetermined state). Examples of the external storage medium 40 include a USB memory, an SSD, and an SD card.

[0029] <Working Machine Control Unit> Upon receiving a notification of the occurrence of a malfunction from the overhead image display device 20, the working machine control unit 10 transmits an instruction to command the overhead image display device 20 to transition to recovery mode. Furthermore, in this embodiment, upon receiving a notification of the occurrence of a malfunction from the overhead image display device 20, the working machine control unit 10 uses the main monitor (notification unit) 11 to notify that a malfunction has occurred in the overhead image display device 20.

[0030] <First Processing Unit> The first processing unit 211 includes, for example, a CPU that executes calculations. The first processing unit 211 performs various processes by executing programs stored in the storage unit 23. The first processing unit 211 controls the function of displaying a screen on the overhead image monitor 22. For example, when the overhead image display device 20 is powered on, the first processing unit 211 starts up the overhead image monitor 22 and displays an image.

[0031] The first processing unit 211 also has a recovery mode as one of its operation modes, which enables recovery using an external storage medium. In the recovery mode, a program can be read from the external storage medium and the program stored in the storage unit 23 can be restored to a state without any problems.

[0032] <Second Processing Unit> The second processing unit 212 includes, for example, a CPU that executes calculations. The second processing unit 212 performs various processes by executing programs stored in the storage unit 23. The second processing unit 212 controls, for example, the power supply and communication functions of the screen display calculation unit 21.

[0033] When a malfunction occurs in the first processing unit 211, the second processing unit 212 notifies the work machine control unit (another processing device) 10 of the malfunction, and by receiving an instruction from the work machine control unit 10 to transition to recovery mode, the second processing unit 212 transitions the first processing unit 211 to recovery mode.

[0034] The second processing unit 212 may transition the first processing unit 211 to the recovery mode when the external storage medium 40 is connected to the input / output port 24 and an instruction to transition to the recovery mode is received.

[0035] 4 and 5 are flowcharts showing a process flow (a method for recovering a display device mounted on a work machine) when a malfunction occurs in the first processing unit 211 that makes it unable to start, and up to when the malfunction is recovered. In FIGS. 4 and 5, the processes of the work machine control unit 10, the first processing unit 211 and the second processing unit 212 of the screen display calculation unit 21, and the operations of a service technician are shown in association with each other.

[0036] 4, the second processing unit 212 determines whether a malfunction that makes the machine unable to start has been detected in the first processing unit 211 (S1). If the determination in S1 is YES, the second processing unit 212 notifies the work machine control unit 10 that a malfunction has occurred in the screen display calculation unit 21 (S2: notification step).

[0037] The work machine control unit 10 determines whether or not a notification informing the user that a malfunction has occurred has been received from the screen display calculation unit 21 (S3). If the determination in S3 is YES, the work machine control unit 10 displays a message on the main monitor 11 informing the user that a malfunction has occurred in the screen display calculation unit 21 (S4: notification step).

[0038] When the service technician visually recognizes the message displayed on the main monitor 11 informing the user that a malfunction has occurred in the screen display calculation unit 21, the service technician performs a predetermined operation to restore the software in order to resolve the malfunction in the screen display calculation unit 21. Specifically, the service technician connects the external storage medium 40 to the input / output port 24 of the screen display calculation unit 21 (S5). Next, the service technician uses the instruction input unit 14 provided in the work machine 1 to command the work machine control unit 10 to transmit an instruction to transition to recovery mode (S6).

[0039] The work machine control unit 10 determines whether it has received an instruction to send a recovery mode transition instruction (S7). If it determines YES in S7, the work machine control unit 10 then determines whether the anti-theft device 12 has been deactivated (S8), as shown in Fig. 5. If it determines YES in S8, the work machine control unit 10 transmits a recovery mode instruction, which is an instruction to transition to the recovery mode, to the screen display calculation unit 21 (S9: instruction step).

[0040] In the command step, the work machine control unit 10 receives a notification of a malfunction from the overhead image display device 20 (specifically, the screen display calculation unit 21), and the instruction input unit provided in the work machine accepts an operation input commanding a transition to recovery mode, so that the work machine control unit 10 can send a recovery mode instruction to the screen display calculation unit 21 commanding a transition to recovery mode.

[0041] The second processing unit 212 determines whether a recovery mode instruction has been received from the work machine control unit 10 (S10). If the determination in S10 is NO, the processing ends. As a result, the recovery mode is executed only when a recovery mode instruction has been received from the work machine control unit 10, which reduces the risk of the external storage medium 40 being inserted due to mischief, erroneous operation, or the like and the recovery mode being executed.

[0042] If the determination in S10 is YES, the second processing unit 212 proceeds to S11, where the second processing unit 212 instructs the first processing unit 211 to transition to recovery mode (command transmission step).

[0043] In the command transmission step, an external storage medium 40 may be connected to the input / output port 214 provided in the overhead image display device 20, and the second processing unit 212 may transition the first processing unit 211 to the recovery mode by receiving an instruction to transition to the recovery mode.

[0044] As a result, the first processing unit 211 transitions to recovery mode and executes software recovery processing based on the recovery processing program stored in the external storage medium 40 (S12). When the recovery processing is completed, the first processing unit 211 notifies the second processing unit 212 of the completion of the recovery processing (S13) and terminates the processing. Upon receiving the notification of the completion of the recovery processing from the first processing unit 211, the second processing unit 212 turns off the power to the screen display calculation unit 21 (S14) and terminates the processing. This completes the processing to recover from the malfunction that occurred in the first processing unit 211 and made it unable to start up.

[0045] Thereafter, an authorized user such as a serviceman turns on the power of the screen display calculation unit 21, and the recovered first processing unit 211 starts up normally.

[0046] (Description of effects) As described above, in the work machine 1 and the overhead image display device 20, even if a software malfunction occurs in the screen display calculation unit 21 of the overhead image display device 20 that prevents the screen from being displayed, the work machine control unit 10 can issue a command to transition to recovery mode, thereby recovering from the software malfunction.

[0047] Therefore, if the overhead image monitor 22 does not start due to a software malfunction of the first processing unit 211 that controls the screen display function, there is no need to replace the entire screen display calculation unit as in the past, thereby reducing the financial burden on the user of the work machine 1.

[0048] Furthermore, in the above configuration, the work machine control unit 10 is configured to send an instruction to the screen display calculation unit 21 to transition to recovery mode only when the anti-theft device 12 is deactivated, thereby preventing unauthorized users other than authorized users, such as service personnel, from accessing the software.

[0049] In this embodiment, the process of S6 is configured to be performed by a service technician using the instruction input unit 14 provided in a predetermined work machine 1, but it can also be performed using a device connected to the work machine 1, such as an OBD (On-board diagnostics) tool. The OBD tool is a dedicated tool for diagnosing fault locations that is connected to a connector (instruction input unit 14) provided in the work machine 1.

[0050] Furthermore, in this embodiment, the processing of S7 is configured to be performed by the work machine control unit 10, but it may also be configured to issue a command using the main monitor 11.

[0051] In this embodiment, the main monitor 11 is used as the notification unit, and a message is displayed when a malfunction occurs in the screen display calculation unit 21. However, the notification method is not limited to the configuration using the main monitor 11, and if an audio output function is provided, the notification may be made by audio, or the work machine control unit 10 may notify by turning on a predetermined lamp, for example.

[0052] In another embodiment, the work machine control unit 10 may transmit information indicating whether the anti-theft device 12 has been deactivated to the overhead image display device 20, and the second processing unit 212 may determine whether the anti-theft device 12 has been deactivated. If the anti-theft device 12 has been deactivated, the second processing unit 212 may instruct the first processing unit 211 to transition to recovery mode. Furthermore, if the anti-theft device 12 has been deactivated, the work machine control unit 10 may use an alarm unit to notify the user that a malfunction has occurred.

[0053] Furthermore, in this embodiment, the specified other equipment was the work machine control unit 10, but the specified other equipment may also be an external PC or other device that can communicate with the overhead image display device 20 via CAN communication or electrical signals, etc.

[0054] Furthermore, although an authenticated key or an anti-theft password has been exemplified as a configuration for disabling the anti-theft device 12, the anti-theft device may also be disarmed using an external server such as telematics, or may be disarmed using a non-physical key such as a digital key.

[0055] [Example of implementation using software] The functions of the work machine 1 and the overhead image display device 20 (hereinafter referred to as the "device") can be realized by a program that causes a computer to function as the device, and a program that causes a computer to function as each control block of the device.

[0056] In this case, the device includes a computer having at least one control device (e.g., a processor) and at least one storage device (e.g., a memory) as hardware for executing the program. The functions described in each of the above embodiments are realized by executing the program using the control device and storage device.

[0057] The program may be non-transitory and may be recorded on one or more computer-readable recording media. The recording media may or may not be included in the device. In the latter case, the program may be supplied to the device via any wired or wireless transmission medium.

[0058] Furthermore, some or all of the functions of the control blocks can be realized by logic circuits. For example, an integrated circuit in which a logic circuit that functions as each of the control blocks is formed is also included in the scope of the present invention. In addition, the functions of the control blocks can also be realized by, for example, a quantum computer.

[0059] Furthermore, each process described in each of the above embodiments may be executed by AI (Artificial Intelligence). In this case, the AI ​​may run on the control device or on another device (for example, an edge computer or a cloud server).

[0060] (Summary) The display device in aspect 1 of the present invention is a display device mounted on a work machine, and comprises a monitor unit and a first control unit that controls each unit of the display device, and the first control unit comprises a first processing unit that controls a screen display function on the monitor unit, and a second processing unit that controls predetermined functions other than the screen display function, and when a malfunction occurs in the first processing unit, the second processing unit notifies a predetermined other device of the malfunction, and receives an instruction from the predetermined other device to transition to a recovery mode that enables software recovery using an external storage medium, thereby transitioning the first processing unit to the recovery mode.

[0061] A display device in aspect 2 of the present invention may be configured in the manner described above for aspect 1, wherein the display device includes a connection unit to which the external storage medium is connected, and the second processing unit transitions the first processing unit to the recovery mode when the external storage medium is connected to the connection unit and the second processing unit receives the instruction to transition to the recovery mode.

[0062] A work device in aspect 3 of the present invention is a work machine equipped with a display device in aspect 1 or 2, and is equipped with a second control unit that controls each part of the work machine, and the specified other equipment is the second control unit, and the second control unit receives a notification of a malfunction from the display device and sends the instruction to transition to the recovery mode.

[0063] A work device in aspect 4 of the present invention may be configured in the manner described above for aspect 3, wherein the work machine is provided with an instruction input unit that accepts operation input from outside, and the second control unit receives a notification of a malfunction from the display device, and transmits the instruction to transition to the recovery mode when the instruction input unit accepts operation input to transition to the recovery mode.

[0064] The work device in aspect 5 of the present invention may be configured to include an anti-theft device that prevents the work device from being stolen in aspect 3 or 4, and the second control unit may be configured not to send the instruction to transition to the recovery mode even if it receives a notification of a malfunction from the display device when the anti-theft device is not deactivated.

[0065] The working device in aspect 6 of the present invention may be configured in any one of aspects 3 to 5 to include an alarm unit that notifies the user of information, and the second control unit may be configured to receive a notification of a malfunction from the display device and use the alarm unit to notify the first control unit that a malfunction has occurred.

[0066] A recovery method for a display device in aspect 7 of the present invention is a recovery method for a display device mounted on a work machine, wherein the display device comprises a monitor unit and a first control unit that controls each unit of the display device, the first control unit comprises a first processing unit that controls a screen display function on the monitor unit and a second processing unit that controls a predetermined function other than the screen display function, and the work machine comprises a second control unit that controls each unit of the work machine, and includes a notification step in which the second processing unit notifies the second control unit of the occurrence of a malfunction in the first control unit when a malfunction occurs in the first processing unit, a command step in which the second control unit sends an instruction to the first control unit from the second control unit when the second control unit receives the notification of the occurrence of the malfunction in the first processing unit, instructing the first control unit to transition to a recovery mode that enables software recovery using an external storage medium, and a command transmission step in which the second processing unit transitions the first processing unit to the recovery mode when the instruction to transition to the recovery mode is received.

[0067] The recovery method for a display device in aspect 8 of the present invention may be configured in such a way that, in the command step of aspect 7, the second control unit receives a notification of a malfunction from the display device, and an instruction input unit provided in the work machine accepts an operation input commanding a transition to the recovery mode, thereby transmitting the instruction commanding a transition to the recovery mode from the second control unit to the first control unit.

[0068] The recovery method for a display device in aspect 9 of the present invention may be configured in the same manner as in aspect 7 or 8, wherein in the command transmission step, the external storage medium is connected to a connection section provided on the display device, and an instruction to transition to the recovery mode is received, thereby causing the second processing section to transition the first processing section to the recovery mode.

[0069] In aspect 10 of the present invention, the method for recovering a display device may be such that, in any of aspects 7 to 9, the work machine further includes an alarm unit that notifies a user of information, and the second control unit uses the alarm unit to notify the user that a malfunction has occurred in the first control unit upon receiving a notification of a malfunction in the first processing unit.

[0070] A recovery method for a display device in aspect 11 of the present invention may be configured such that, in any of aspects 7 to 10, the work machine is equipped with an anti-theft device that prevents the work machine from being theft, and in the command step, the second control unit sends an instruction to transition to the recovery mode if the anti-theft device of the work machine is deactivated, and does not send an instruction to transition to the recovery mode if the anti-theft device of the work machine is not deactivated.

[0071] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0072] REFERENCE SIGNS LIST 1 Work machine 10 Work machine control unit (second control unit, other specified equipment) 11 Main monitor (alarm unit) 12 Anti-theft device 13 Communication unit 14 Instruction input unit 20 Bird's-eye view image display device (display device) 21 Screen display calculation unit (first control unit) 22 Bird's-eye view image monitor (monitor unit) 40 External storage medium 211 First processing unit 212 Second processing unit 214 Input / output port (connection unit)

Claims

1. A display device mounted on a work machine, comprising: a monitor unit; and a first control unit that controls each unit of the display device, wherein the first control unit comprises: a first processing unit that controls the screen display function of the monitor unit; and a second processing unit that controls predetermined functions other than the screen display function, wherein the second processing unit notifies a predetermined other device of the occurrence of a malfunction in the first processing unit, and upon receiving an instruction from the predetermined other device to transition to a recovery mode that enables software recovery using an external storage medium, causes the first processing unit to transition to the recovery mode.

2. The display device according to claim 1, wherein the display device comprises a connection unit to which the external storage medium is connected, and the second processing unit transitions the first processing unit to the recovery mode when the external storage medium is connected to the connection unit and the second processing unit receives the instruction to transition to the recovery mode.

3. A work machine equipped with the display device described in claim 1, further comprising a second control unit that controls each part of the work machine, wherein the specified other device is the second control unit, and the second control unit receives notification of a malfunction from the display device and transmits the instruction to transition to the recovery mode.

4. The work machine according to claim 3, further comprising an instruction input unit that accepts operation input from outside, and the second control unit receives a notification of a malfunction from the display device and transmits the instruction to transition to the recovery mode when the instruction input unit accepts operation input to transition to the recovery mode.

5. A work machine as described in claim 3 or 4, which is provided with an anti-theft device that prevents the work machine from being stolen, and the second control unit does not send the instruction to transition to the recovery mode if the anti-theft device is not deactivated.

6. A work machine as described in claim 3 or 4, which is provided with an alarm unit that notifies a user of information, and the second control unit receives a notification of a malfunction from the display device and uses the alarm unit to notify the first control unit that a malfunction has occurred.

7. A method for recovering a display device mounted on a work machine, wherein the display device comprises a monitor unit and a first control unit that controls each unit of the display device, the first control unit comprising a first processing unit that controls a screen display function on the monitor unit and a second processing unit that controls predetermined functions other than the screen display function, and the work machine comprises a second control unit that controls each unit of the work machine, the method comprising: a notification step in which, when a malfunction occurs in the first processing unit, the second processing unit notifies the second control unit of the occurrence of the malfunction in the first control unit; a command step in which, when the second control unit receives the notification of the occurrence of the malfunction in the first processing unit, the second control unit transmits an instruction to the first control unit to transition to a recovery mode that enables software recovery using an external storage medium; and a command transmission step in which, when the instruction to transition to the recovery mode is received, the second processing unit transitions the first processing unit to the recovery mode.

8. A recovery method for a display device as described in claim 7, wherein in the command step, the second control unit receives a notification of a malfunction from the display device, and an instruction input unit provided in the work machine accepts an operation input commanding a transition to the recovery mode, thereby transmitting the instruction commanding a transition to the recovery mode from the second control unit to the first control unit.

9. A recovery method for a display device as described in claim 7 or 8, wherein in the command transmission step, the external storage medium is connected to a connection unit provided on the display device, and the second processing unit transitions the first processing unit to the recovery mode by receiving an instruction to transition to the recovery mode.

10. The method for recovering a display device described in claim 7 or 8, wherein the work machine further comprises an alarm unit that notifies a user of information, and the method includes an alarm step in which, upon receiving notification of a malfunction in the first processing unit, the second control unit uses the alarm unit to notify the user that a malfunction has occurred in the first control unit.

11. A recovery method for a display device as described in claim 7 or 8, wherein the work machine is equipped with an anti-theft device that prevents the work machine from being theft, and in the command step, the second control unit transmits an instruction to command a transition to the recovery mode if the anti-theft device of the work machine is deactivated, and does not transmit an instruction to command a transition to the recovery mode if the anti-theft device of the work machine is not deactivated.

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