Work machine

Abstract

The work machine comprises a gateway device for communicating with a control device and a cutoff warning device. When executing an ending process for ending an operating state of the control device, the control device outputs, to the gateway device, a control end notice time, which is the advance-notice end time by the ending process. The gateway device calculates a gateway end notice time for ending the operation of the gateway device on the basis of the control end notice time received from the control device, and outputs the gateway end notice time to the cutoff warning device. The cutoff warning device issues a warning for urging prohibition of use of the cutoff switch, until the gateway end notice time received from the gateway device.

Description

Work machinery

[0001] The present invention relates to a work machine.

[0002] Work machines generally have a battery as a power supply. During maintenance work on the work machine, a ground fault or short circuit may occur in the power supply line of the battery, which could damage electronic devices such as the control device of the work machine itself (for example, the vehicle body). To prevent this, a cut-off switch is provided to electrically separate the electronic devices from the battery, and when performing certain work, the power supply is cut off in advance by turning on the cut-off switch.

[0003] On the other hand, if the cutoff switch is operated while the electronic device is running, the power supply to the electronic device will be cut off, and there is a risk of losing data being processed. To prevent this from happening, in addition to the cutoff switch, work machines are equipped with a cutoff warning device that warns against turning off the power.

[0004] Patent Document 1 states, "The battery cutoff device for construction machinery according to the present invention comprises a battery housed in a battery box, a cutoff switch which switches the connection of the battery connected to one polarity electrode of the battery, a display unit which has one end connected to the battery, a controller which controls predetermined functions of the vehicle on which the battery is mounted, a control unit which internally generates an operating signal which is turned on when the controller is operating, and a key switch which is connected to the other polarity electrode of the battery and switches the activation of the controller, wherein the controller is characterized by comprising: an internal power switch which is connected to the other polarity electrode of the battery and turns on and off the power supply from the battery to the controller; a self-holding circuit which has a logical OR circuit which turns on the internal power switch when the logical OR of the on / off of the operating signal and the on / off of the key switch after the key switch is turned off is on; and a display switch which causes the display unit to display when the operating signal is on."

[0005] JP 2011-63234 A

[0006] According to the technology disclosed in Patent Document 1, the control device and the shutdown warning device are directly connected via a communication interface, and the control device notifies the shutdown warning device of its activation state.

[0007] However, directly connecting the control device and the shutdown warning device via a communication interface can be physically difficult due to constraints imposed by the types and number of communication interfaces provided on the control device and the shutdown warning device. This problem is particularly pronounced in recent work machines, where the number of various control devices is increasing due to the increasing functionality of the machines. Furthermore, it is necessary for the control device and the shutdown warning device to continue communicating and / or monitoring via the communication interface at least until the termination process for the startup state of the control device is completed. These problems are particularly exacerbated when multiple control devices are used.

[0008] SUMMARY OF THE INVENTION It is therefore an object of the present invention to appropriately issue a warning to urge users to prohibit use of the cutoff switch of a power supply device without directly connecting the control device and the cutoff warning device via a communication interface.

[0009] A gateway device is provided that communicates with the control device and the shutdown warning device. When the control device executes a termination process to terminate the activation state of the control device, it outputs a control termination notice time, which is the notice time for the termination process, to the gateway device. Based on the control termination notice time received from the control device, the gateway device calculates a gateway termination notice time for terminating the activation of the gateway device and outputs this to the shutdown warning device. The shutdown warning device issues a warning to prohibit use of the shutdown switch until the gateway termination notice time received from the gateway device.

[0010] According to the present invention, it is possible to appropriately issue a warning to urge prohibition of use of the cutoff switch of the power supply device without directly connecting the control device and the cutoff warning device via a communication interface.

[0011] 1. A system block diagram of a first embodiment. A work machine (shovel) of a first embodiment. A configuration diagram of an end schedule management table of a first embodiment. A flowchart of a gateway device of a first embodiment. A flowchart of a cutoff warning device of a first embodiment. A time chart of a first embodiment (activation by a start switch). A part of a flowchart of a cutoff warning device of a second embodiment. A time chart of a second embodiment (automatic activation by a control device 1).

[0012] In the following description, "memory" refers to one or more memory devices, typically a primary storage device. At least one memory device in the memory may be a volatile memory device or a non-volatile memory device.

[0013] In the following description, a "persistent storage device" refers to one or more persistent storage devices. A persistent storage device is typically a non-volatile storage device (e.g., an auxiliary storage device), and specifically, for example, a hard disk drive (HDD) or a solid state drive (SSD).

[0014] In the following description, the term "storage device" may refer to at least one of memory and persistent storage device.

[0015] In the following description, a "processor" refers to one or more processor devices. The at least one processor device is typically a microprocessor device such as a CPU (Central Processing Unit), but may also be other types of processor devices such as a GPU (Graphics Processing Unit). The at least one processor device may be a single-core or multi-core. The at least one processor device may also be a processor core. The at least one processor device may also be a processor device in a broader sense, such as a hardware circuit that performs part or all of the processing (for example, an FPGA (Field-Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit)).

[0016] Furthermore, in the following description, functions may be described using the expression "yyy unit." However, the functions may be realized by one or more computer programs executed by a processor, by one or more hardware circuits (e.g., FPGAs or ASICs), or by a combination thereof. When a function is realized by a program executed by a processor, the specified processing is performed using a storage device and / or an interface device, etc., as appropriate, and therefore the function may be considered to be at least a part of the processor. Processing described using a function as the subject may be processing performed by a processor or a device having the processor. A program may be installed from a program source. The program source may be, for example, a program distribution computer or a computer-readable recording medium (e.g., a non-transitory recording medium). The description of each function is an example; multiple functions may be combined into one function, or one function may be divided into multiple functions.

[0017] In the following description, data that produces an output in response to an input may be described using expressions such as "xxx table." However, this data may have any structure (for example, structured data or unstructured data), or may be a learning model such as a neural network, genetic algorithm, or random forest that generates an output in response to an input. Therefore, "xxx table" can be referred to as "xxx information." In the following description, the structure of each table is an example, and one table may be divided into two or more tables, or all or part of two or more tables may be one table.

[0018] In the following description, when elements of the same type are described without distinction, a common reference symbol (e.g., "130") is used, and when elements of the same type are described with distinction, a reference symbol (e.g., "130-1" or "130-2") or an element ID (e.g., "1") is used. In the following description, reference symbols have three or more digits.

[0019] Some examples will be described below.

[0020] FIG. 1 is a system block diagram of the first embodiment.

[0021] The work machine 100 comprises a work machine main body 180 , a start switch 101 , a power supply device 102 , a cutoff switch 103 , a cutoff warning device 110 , multiple (or one) control devices 130 , and a gateway device 120 .

[0022] The work machine main body 180 is the main part of the work machine 100. For example, if the work machine 100 is a shovel as shown in Figure 2, the work machine main body 180 is a vehicle body. An shovel is made up of, for example, an upper rotating body 202 including a cab 201 and a counterweight 207, a crawler-type lower traveling body 206, and a work implement including a boom 203, an arm 204, and a bucket 205. Hereinafter, in the explanation of the embodiments, the work machine 100 may be referred to as an "excavator 100".

[0023] The start switch 301 is a human interface that allows an operator to issue commands to start and stop the shovel. In other words, the start switch 301 is manually operated.

[0024] The power supply device 102 supplies power to the shutdown warning device 110, the gateway device 120, and the control device 130, and outputs a start switch activation command to activate the shutdown warning device 110, the gateway device 120, and the control device 130 in response to a command from the start switch 101. Furthermore, when the operator operates the start switch 101, the power supply device 102 stops outputting the start switch activation command. At this time, the control device 130 stops after executing predetermined termination processes, such as engine shutdown processing and saving processed data. Thus, in this embodiment, the output of the power supply device 102 includes power supply and start switch activation command output. The start switch activation command may be output from a device separate from the power supply device 102. Furthermore, the power supply device 102 may be a battery itself or a device that includes a battery.

[0025] The cutoff switch 103 is a switch operated by an occupant, a service person, or the like, and is a switch that cuts off the power supply from the power supply device 102 (and the start switch activation command output) to prevent electric shock and failure of the control device when disassembling or welding the work machine 100. When the cutoff switch 103 is operated, the power supply from the power supply device 102 to each device mounted on the work machine 100 is cut off. Note that the person who operates the start switch 301 and the cutoff switch 103 is not limited to the operator or service person described above. Furthermore, the cutoff switch 103 may be a physical switch that mechanically cuts off the power supply circuit from the power supply device 102 to each device, or it may be a switch that sends a command to the power supply device 102 to cut off the power supply to each device.

[0026] In order to reduce the risk of failure of the excavator 100 or loss of processing data, the shutoff warning device 110 issues a warning to a service person via the warning output device 150 while the control device 130 is activated, urging the service person to prohibit use of the shutoff switch 103. For example, the warning output device 150 may be a warning light provided near the shutoff switch 103, and the warning urging the service person to prohibit use of the shutoff switch may be lit by turning on the warning light. Note that the warning output device 150 may be a display device such as a liquid crystal display or an audio output device such as a buzzer instead of or in addition to a warning light. In the following embodiments, the warning output device 150 is assumed to be a warning light, and the "warning output device 150" may also be referred to as the "warning light 150."

[0027] The shutdown warning device 110 has a table storage area 113 in which a termination schedule management table, which will be described later, is stored, and an end time management unit 112 and a warning control unit 111, which will be described later.

[0028] The control device 130 controls the work machine main body 180 using power supplied from the power supply device 102. The control device 130 has a state management unit 131 that controls the device 130 in response to a start switch activation command, and an end notice unit 132, which will be described later.

[0029] The gateway device 120 communicates with the control device 130 and the shutdown warning device 110. The gateway device 120 has a state management unit 121 that controls the device 120 in response to a start switch activation command, a warning start command unit 124 that outputs a warning start command to the shutdown warning device 110 in response to the start switch activation command, and an end notice unit 122 and an end notice management unit 123, which will be described later.

[0030] The control devices 130 include, for example, a control device 130-1 (control device 1) and a control device 130-2 (control device 2). The control device 130 and the gateway device 120 are mounted on the excavator 100. Furthermore, the control device 1, the control device 2, and the shutdown warning device 110 can communicate directly only with the gateway device 120 due to restrictions on the communication interface. Furthermore, each of the devices 110, 120, and 130 may be provided with a communication interface device, a storage device, and a processor connected to these, and the processor may realize a function such as a yyy unit. Furthermore, the table storage area 113 may be provided in the storage device of the shutdown warning device 110.

[0031] FIG. 3 is a diagram showing the structure of the end schedule management table 300.

[0032] The termination schedule management table 300 indicates the scheduled termination time for each termination process content for each of the control device 130 and the gateway device 120. Specifically, for example, the termination schedule management table 300 has a record for each termination process, and the record has information such as a device ID 301, a termination process content 302, and a scheduled termination time 303.

[0033] The device ID 301 is identification information for the control device 130 or the gateway device 120. The termination process content 302 is information indicating the content of the termination process (for example, the content of the termination process itself or information indicating the type of termination process). The estimated termination time 303 is information indicating the estimated end time of the termination process (for example, the estimated time required for the termination process or the estimated end time of the termination process). As illustrated in Fig. 3, the estimated end time differs depending on the device and the termination process content.

[0034] FIG. 4 is a flowchart of the gateway device 120.

[0035] The state control unit 121 of the gateway device 120 determines whether the start switch activation command is for stopping or not (step 401).

[0036] If the determination result in step 401 is true (step 401: Yes), the termination notice management unit 123 determines whether termination notices have been received from all of the control devices 130-1 and 130-2 (step 402).

[0037] If the determination result in step 402 is true (step 402: Yes), the state management unit 121 determines whether the termination process of the gateway device 120 can be completed within the estimated completion time T5 (see FIG. 3) of the termination process (step 403). This determination may be made based on the load status of the gateway device 120, for example.

[0038] If the judgment result of step 403 is true (step 403: Yes), the status management unit 121 instructs the termination notification unit 122 to issue a termination notification, and in response to the instruction, the termination notification unit 122 notifies the termination notification management unit 123 of the termination notification, and the termination notification management unit 123 notifies the shutdown warning device 110 of the termination notification (step 404).

[0039] Thereafter, the termination notice management unit 123 executes the termination process (for example, the remainder of the termination process) (step 405).

[0040] Next, a case where the operator starts or stops the shovel 100 using the start switch 101 will be described.

[0041] Fig. 5 is a flowchart of the shutdown warning device 110, and the time chart of Fig. 6 is an example of an execution result in Example 1. The flowchart of Fig. 5 starts simultaneously with the activation of the shutdown warning device 110 and is repeatedly executed at a predetermined cycle. Hereinafter, Example 1 will be described in accordance with this flowchart.

[0042] In step 501, the warning control unit 111 determines whether the warning light that warns the user not to use the shutoff switch 103 is on. At time t600 in FIG. 6, the start switch 101 is operated, and the power supply device 102 outputs a start switch activation command. This start switch activation command activates the shutoff warning device 110. At this time, the warning light 150 is not on (step 501: No). Therefore, the process proceeds to step 502.

[0043] In step 502, the warning control unit 111 determines whether or not to turn on the warning light 150. If the start switch activation command has been applied to the shutoff warning device 110 (step 502: Yes), in step 503, the warning control unit 111 turns on the warning light 150 (step 503). On the other hand, if it is not necessary to turn on the warning light 150 (step 502: No), this process ends.

[0044] In step 504, the termination time management unit 112 determines whether a new termination notice has been received from the control device 1, the control device 2, or the gateway device 120. A "termination notice" is a notification indicating a state in which the time required for the termination process to stop the control device 1, the control device 2, or the gateway device 120 has fallen below a predetermined time (estimated termination process time) (i.e., a notice of the termination of the active state). Furthermore, the "estimated termination process time" depends on the device performing the termination process and the content of the termination process that is being executed or scheduled to be executed at the time the termination notice is notified.

[0045] In Example 1, at time t601 in FIG. 6, the operator operates the start switch 101, and the start switch activation command is stopped (the operator turns off the start switch 101), which triggers the control device 1 and the control device 2 to start the termination process. At this time, the termination notification unit 132-1 and the termination notification unit 132-2 monitor the execution status of the termination process from the status management units 131-1 and 131-2, respectively, and when the termination process reaches a predetermined execution stage, they notify the termination notification management unit 123 of the gateway device 120 of a termination notification (hereinafter referred to as the control termination notification) containing the remaining termination process content and the identification information of the control device 1 or 2. Note that after notifying the control termination notification, the control device 1 and the control device 2 terminate as soon as all termination processes are completed. Time t602 and time t603 in FIG. 6 are the termination times of the control device 1 and the control device 2, respectively. The estimated end time illustrated in FIG. 3 is an approximate time (for example, the estimated end time considered to be the longest or latest), and it is possible that the termination process will end before the estimated end time has elapsed since the termination notice was output.

[0046] In addition, the termination notice unit 122 of the gateway device 120 determines that the termination notice management unit 123 has received control termination notices from the control devices 1 and 2, and acquires the termination processing status from the status management unit 121. When the gateway device 120 can terminate within the specified termination time, the termination notice unit 122 notifies the termination notice management unit 123 of a termination notice (hereinafter referred to as a gateway termination notice) including the remaining termination processing content and the identification information of the gateway device 120. After notifying the gateway termination notice, the gateway device 120 terminates as soon as it completes the termination processing. t604 in FIG. 6 is the termination time of the gateway device 120 in the first embodiment. Note that in this embodiment, the gateway device 120 notifies the interruption warning device 110 of the received control termination notice each time it receives a control termination notice from the control devices 1 and 2. However, the gateway termination notice of the termination notice management unit 123 may include the control termination notices from the control devices 1 and 2, and the notification of the gateway termination notice may also serve as the notification of the control termination notices from the control devices 1 and 2.

[0047] In step 505, upon receiving a termination notice (control termination notice or gateway termination notice), the termination time management unit 112 begins counting the time that has elapsed since receiving the termination notice (termination processing elapsed time) for each device that output the termination notice.

[0048] In step 506, the end time management unit 112 counts up the end processing elapsed time that has already started to be counted.

[0049] In step 507, the end time management unit 112 determines whether or not end notices have been received from all of the control devices 130 and the gateway device 120. If all end notices have not been received (step 507: No), the warning light 150 will not be turned off, and the process ends.

[0050] In step 508, the termination time management unit 112 determines whether the elapsed termination process times for all control devices 130 and gateway devices 120 exceed the corresponding scheduled termination times. Here, the "corresponding scheduled termination times" refer to the scheduled termination times (the estimated time required to complete the termination process) identified in the termination schedule management table 300 for the identification information and termination process content identified from the termination notice. If all termination process elapsed times exceed the corresponding scheduled termination times (step 508: Yes), it is estimated that the control devices 1 and 2 and the gateway device 120 have already terminated, and the process proceeds to step 509, where the warning control unit 111 turns off (turns off) the warning light 150. t605 in FIG. 6 is the time at which the warning light 150 is turned off.

[0051] If the gateway device 120 directly monitors whether the control devices 1 and 2 are activated, the gateway device 120 must be activated (maintain an activated state) until time 603 in Fig. 6 and instruct the shutdown warning device 110 to keep the warning light 150 lit. However, by the process of the first embodiment, the gateway device 120 can be shut down once the scheduled shutdown times of all the control devices 130 have been estimated, thereby reducing the power consumption of the gateway device 120.

[0052] A description will be given of Example 2. Differences from Example 1 will be mainly described, and explanations of commonalities with Example 1 will be omitted or simplified.

[0053] FIG. 7 is a part of a flowchart of the interruption warning device 110 according to the second embodiment.

[0054] The difference from the first embodiment is that the state management units 131 of the control devices 1 and 2 and the state management unit 121 of the gateway device 120 are activated under a predetermined condition without a start switch activation command, in addition to (or instead of) activating or terminating in response to a start switch activation command. The "predetermined condition" refers to the detection of a predetermined event other than the operation of the start switch 101, such as the opening or closing of the door of the shovel 100, the arrival of a predetermined time, or the receipt of an automatic activation command via a communication interface. When a control device 130 detects the opening or closing of the door of the shovel 100, it can turn on the interior light of the shovel 100 to assist the operator in boarding the shovel. Furthermore, the control device 1 may upload information such as the vehicle position and operating hours to an external server at the end of the day. In this case, the state management unit 131-1 activates the control device 1 triggered by the arrival of a predetermined time, rather than by a start switch activation command. Additionally, using technology such as Wake-on-Lan, the control device 1 may send an automatic activation command via a communication interface to activate another control device 2. In Example 2, the control device 1 is assumed to start at a predetermined time and upload vehicle body information to an external server. At this time, the information to be transmitted is also stored in the control device 2, so the gateway device 120 and the control device 2 are assumed to be started by an automatic start command. The control device 2 then notifies the control device 1 of the predetermined information via the gateway device, and then terminates. The control device 1 also uploads the vehicle body information, including the information acquired from the control device 2, to the external server, and terminates after the upload is complete.

[0055] The difference from the first embodiment is that in step 702, a warning is started not only by a start switch activation command but also by a warning start command.

[0056] The warning start command is a command to start a warning when the control device 130 or the gateway device 120 is started up in the absence of a start switch activation command.

[0057] In the example of Fig. 8, it is assumed that the control device 1 detects the arrival of a predetermined time and starts up at time t800 in order to upload vehicle body information to the off-vehicle server. At this time, the control device 1 transmits an automatic start command to the state management unit 121 of the gateway device 120 in order to collect vehicle body information to be transmitted to the off-vehicle server, and the gateway device 120 starts up at time t804 in Fig. 8. Then, triggered by the start of the automatic start command, the gateway device 120 starts up the control device 2 at time t802 in Fig. 8. At this time, in order to prevent the upload to the off-vehicle server from being interrupted by operation of the cutoff switch 603, the gateway device 120 commands the cutoff warning device 110 to start a warning via the warning start command unit 124.

[0058] In addition, in this embodiment, the control device 2 notifies the control device 1 of the specified vehicle body information, outputs a termination notice to the gateway device 120, and then terminates at time t803 in FIG. 8. In addition, when the termination notice unit 132-1 of the control device 1 determines that the time until the control device 1 completes uploading the vehicle body information is equal to or less than T2 illustrated in FIG. 3, it outputs a termination notice to the gateway device 120. In Example 2, after the control device 1 outputs the termination notice, it terminates at time t801 in FIG. 8. Then, after the control devices 1 and 2 output the termination notices, the gateway device 120 notifies a gateway termination notice and terminates as soon as the specified termination processing is completed. In Example 2, it is assumed that the gateway device 120 terminates at time t805 in FIG. 8.

[0059] As described above, even when the control device 130 is started up without operating the start switch 101, a warning is output urging prohibition of use of the shut-off switch 103, and the start-up time of the gateway device 120 can be shortened compared to when the start-up status of the control devices 1 and 2 is monitored to control whether or not to issue a warning, thereby reducing the power consumption of the gateway device 120.

[0060] The shutdown warning device 110 does not directly monitor the activation state of the control device 130, but estimates the timing of the termination of the control device 130 based on the control device 130 that outputs the termination notice and the termination processing content of the control device 130. For this reason, there is a possibility that the warning will continue longer than the control device 130 actually terminates. In this case, power consumption due to the activation state of the shutdown warning device 110 is wasted, but because the power consumption of the gateway device 120, which is a higher performance electronic device, is greater, shortening the activation time of the gateway device 120 has a greater effect in terms of reducing power consumption.

[0061] Although several embodiments have been described above, these are merely examples for explaining the present invention, and it is not intended that the scope of the present invention be limited to only these embodiments. The present invention can be implemented in various other forms. For example, instead of or in addition to a shovel, the present invention can be applied to various work machines (for example, construction work machines such as construction vehicles, or other work machines).

[0062] For example, the above description can be summarized as follows: The following summary may include supplementary explanations and explanations of variations of the above description.

[0063] The work machine 100 comprises a work machine main body 180, a power supply device 102, a shutoff switch 103 that shuts off the output of the power supply device 102, a control device 130 that controls the work machine main body 180, a gateway device 120 that communicates with the control device 130, and a shutoff warning device 110 that communicates with the gateway device 120. The devices 110, 120, and 130 receive power from the power supply device 102. When the control device 130 executes termination processing to terminate the startup of the control device 130, it outputs a control termination notice time, which is the notice time for the termination processing, to the gateway device 120. The gateway device 120 calculates a gateway termination notice time for terminating the startup of the gateway device 120 based on the control termination notice time received from the control device 130, and outputs this to the shutoff warning device 110. The shutoff warning device 110 issues a warning urging prohibition of use of the shutoff switch 103 until the gateway termination notice time received from the gateway device 120.

[0064] The gateway device 120 is interposed between the control device 130 and the shutdown warning device 110, and the control device 130 and the shutdown warning device 110 each communicate with the gateway device 120. Therefore, there is no need to directly connect the control device 130 and the shutdown warning device 110 via a communication interface, which avoids problems with the type and number of communication interfaces provided in the control device 130 and the shutdown warning device 110, and there is also no need for the control device 130 and the shutdown warning device 110 to continue communicating via the communication interface at least until the termination process of the startup state of the control device 130 is completed.

[0065] Furthermore, when monitoring the activation status of the control devices 130 via the gateway device 120, in one comparative example, the gateway device 120 must continue activation until all of the control devices 130 have terminated, resulting in a large amount of power consumption by the gateway device 120. However, in the embodiment, the control devices 130 and the gateway device 120 each output a termination notice, the shutdown warning device 110 maintains the warning until it estimates that the termination process for which it has been notified has been completed, and after outputting the gateway termination notice, the gateway device 120 terminates without waiting for the control devices 130 to terminate. This reduces the power consumption of the gateway device 120.

[0066] For example, the control device 130 may output a control termination notice that is a notice of termination of the activation state of the control device 130, and perform termination processing to terminate the activation state of the control device 130. When the gateway device 120 receives a control termination notice from the control device 130, it may output a gateway termination notice that is a notice of termination of the activation state, and perform termination processing to terminate the activation state of the gateway device. When the shutdown warning device 110 receives a startup command, it may issue a warning to prohibit use of the shutdown switch 103, and may stop the warning when it receives the gateway termination notice and estimates that the notified termination processing has been completed.

[0067] A plurality of control devices 130 may be connected to the gateway device 120. When there are a plurality of control devices 130, there are more advantageous effects than when there is a single control device 130, such as the fact that there is no need to directly connect the control device 130 and the shutdown warning device 110 via a communication interface and that the power consumption of the gateway device 120 can be reduced.

[0068] For example, a plurality of control devices 130 may be provided depending on the functions of the work machine main body 180, and the gateway device 120 may calculate the gateway end notice time as the longest of the control end notice times of each of the plurality of control devices 130 and the time required for the gateway device 120 to finish starting up. The "control end notice time" may be, for example, the time indicated by the scheduled end time 303 for the control device 130, and the "time required for the gateway device 120 to finish starting up" may be, for example, the time indicated by the scheduled end time 303 for the gateway device 120.

[0069] When the shutdown process of the control device 130 or gateway device 120 is completed (when the startup state is terminated), the control device 130 or gateway device 120 may be turned off (for example, into a state of low or no power consumption such as sleep mode or shutdown).

[0070] The term "when it is estimated that the termination process whose termination has been announced has been completed" may refer to when the gateway termination announcement time has elapsed. Typically, from the viewpoint of terminating the gateway device 120 before at least one control device 130, the time required to terminate the activation of the gateway device 120 is shorter than the control termination announcement time of at least one control device 130.

[0071] Each time the gateway device 120 receives a control end notice (e.g., a notice associated with a control end notice time) from the control device 130, the gateway device 120 may forward the control end notice to the shutoff warning device 110. When the shutoff warning device 110 receives a control end notice, the gateway device 120 may start timing the control device 130 and estimate whether the measured time has passed the control end notice time.

[0072] Furthermore, the gateway device 120 may transmit a gateway termination notice (for example, a notice associated with "the time required for the gateway device 120 to finish startup" or "gateway termination notice time") that includes control termination notices for all the control devices 130. Based on the gateway termination notice, the interruption warning device 110 may monitor whether the gateway termination notice time has elapsed (estimate whether the termination processing of all the control devices 130 and the gateway device 120 has been completed).

[0073] The gateway device 120 may output to the interruption warning device 110 the identification information of the control device 130 that output the control end notice and the identification information of the gateway device 120. The identification information of the control device 130 may be included in the control end notice, and the identification information of the gateway device 120 may be included in the gateway end notice. The interruption warning device 130 may store, for each of the control device 130 and the gateway device 120, the identification information of the device and termination schedule management information indicating the scheduled termination time. The interruption warning device 130 may identify, for each of all the control devices 130 and the gateway device 120, the control end notice time corresponding to the device's identification information from the termination schedule management information. This makes it possible to reduce the power consumption of the gateway device 120 and maintain appropriate warnings, even if the control end notice time differs depending on the device. Note that the termination schedule management information may be stored in the gateway device 120 instead of or in addition to the interruption warning device 110.

[0074] The control end notice time of the control device 130 may be a time according to the content of the termination process of the control device 130. Furthermore, the time required for the gateway device 120 to terminate startup may be a time according to the content of the termination process of the gateway device 120.

[0075] Specifically, for example, the control termination notice from the control device 130 may be associated with termination process content information, which is information indicating the content of the termination process. The gateway device may output the process termination content information associated with the received control termination notice to the shutdown warning device 110. The termination schedule management information may include a pair of information indicating the termination process content and information indicating the control termination notice time for the control device 130 (and the gateway device 120). The scheduled termination time identified for each control device 130 (and the gateway device 120) may include the scheduled termination time corresponding to the termination process content information from the gateway device 120. This makes it possible to reduce the power consumption of the gateway device 120 and maintain appropriate warnings, even if the scheduled termination time varies depending on the device and the termination process content.

[0076] The control termination notice may be associated with scheduled termination time information, which is information indicating the scheduled termination time of the termination process. That is, the control device 130 may be configured to associate information indicating the scheduled termination time of the control device 130 with the control termination notice and output it. In this case, scheduled termination management information may not be necessary. The gateway device 120 may output scheduled termination time information associated with the control termination notice to the interruption warning device 110, and may output scheduled termination time information indicating the scheduled termination time of the gateway device 120's termination process in association with the gateway termination notice. The termination process whose termination is scheduled to be terminated may be estimated to have ended when the latest or longest scheduled termination time indicated by the scheduled termination time information of all the control devices 130 and the gateway device 120 has elapsed. This makes it possible to reduce the power consumption of the gateway device 120 and maintain appropriate warnings based on the scheduled termination time information output from the control device 130 and the gateway device 120, even if the scheduled termination time varies depending on the device and the termination process content.

[0077] The start command as a trigger for starting the warning may be a command output when the manually operated start switch 101 is operated, or may be a command output when a predetermined event other than the operation of the start switch 101 is detected. The warning can be started at an appropriate timing.

[0078] 102 Power supply device 103 Shut-off switch 110 Shut-off warning device 120 Gateway device 130 Control device

Claims

1. A work machine comprising: a work machine main body; a power supply unit that supplies power; and a cutoff switch that cuts off the power supply from the power supply unit; a control unit that receives power from the power supply unit and controls the work machine main body; a gateway unit that receives power from the power supply unit and communicates with the control unit; and a cutoff warning unit that receives power from the power supply unit and communicates with the gateway unit, wherein when the control unit executes a termination process to terminate the startup of the control unit, it outputs a control termination warning time that is the termination warning time of the termination process to the gateway unit, the gateway unit calculates a gateway termination warning time for terminating the startup of the gateway unit based on the control termination warning time received from the control unit and outputs the calculated time to the cutoff warning device, and the cutoff warning device issues a warning urging the user to not use the cutoff switch until the gateway termination warning time received from the gateway unit.

2. A work machine as described in claim 1, characterized in that a plurality of the control devices are provided according to the functions of the work machine main body, and the gateway device calculates as the gateway end notice time the longest of the control end notice times of each of the plurality of control devices and the time required for the gateway device to finish startup.

3. The work machine according to claim 2, wherein the gateway device outputs to the shutdown warning device identification information of the control device that output the control end notice and identification information of the gateway device, the shutdown warning device stores identification information and termination schedule management information indicating a scheduled termination time for each of the control device and the gateway device, and the shutdown warning device identifies the control end notice time corresponding to the identification information for each of the control device and the gateway device that output the control end notice from the termination schedule management information.

4. A work machine according to claim 2, wherein the control termination notice time of the control device is a time according to the content of the termination process of the control device.

5. A work machine according to claim 2, wherein the time required for the gateway device to complete startup is a time according to the content of the processing required for the gateway device to complete.

6. A work machine as described in claim 1, wherein the start command is a command that is output when a manually operated start switch is operated, or a command that is output when a specified event other than the operation of the start switch is detected.

7. A work machine according to any one of claims 1 to 6, wherein a plurality of the control devices are connected to the gateway device.