Work machine and charging method for work machine

Abstract

This work machine includes: a vehicle body; a hydrogen port to which hydrogen is supplied from the outside of the vehicle body; a fuel cell that generates power while receiving supply of hydrogen from the hydrogen port; and a power supply port for supplying power generated by the fuel cell to a battery mounted on a battery work machine.

Description

Work machine and method for charging work machine

[0001] The present disclosure relates to a work machine and a method for charging a work machine.

[0002] Patent Document 1 discloses a technology relating to wireless energy transmission between vehicles.

[0003] US Patent Application Publication No. 2021 / 0323420

[0004] A work machine operates at a work site. The electric work machine has a battery. The battery is charged at a charging station. There is a demand for a technology that allows the battery of the work machine to be charged by a method other than using a charging station.

[0005] The present disclosure is directed to charging a battery on a work machine.

[0006] According to the present disclosure, there is provided a work machine comprising a vehicle body, a hydrogen port to which hydrogen is supplied from outside the vehicle body, a fuel cell that generates electricity while receiving a supply of hydrogen from the hydrogen port, and a power supply port for supplying the electricity generated by the fuel cell to a battery mounted on the battery work machine.

[0007] According to the present disclosure, a work machine battery is charged.

[0008] FIG. 1 is a diagram showing a construction machine management system according to the first embodiment. FIG. 2 is a diagram showing a shovel according to the first embodiment. FIG. 3 is a diagram showing a bulldozer according to the first embodiment. FIG. 4 is a diagram for explaining the types of power sources of the construction machine according to the first embodiment. FIG. 5 is a configuration diagram showing an FC construction machine according to the first embodiment. FIG. 6 is a configuration diagram showing a battery construction machine according to the first embodiment. FIG. 7 is a block diagram showing a control system for the FC construction machine according to the first embodiment. FIG. 8 is a diagram showing an FC construction machine and a battery construction machine according to the first embodiment. FIG. 9 is a flowchart showing a control method for a construction machine according to the first embodiment. FIG. 10 is a block diagram showing a control system for an FC construction machine according to a second embodiment.

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiments. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

[0010] First Embodiment A first embodiment will be described.

[0011] <Overview of Management System> Fig. 1 is a diagram showing a management system 1 for a work machine 2 according to this embodiment. The management system 1 manages work machines 2 operating at a work site 3. A plurality of work machines 2 exist at the work site 3. In the example shown in Fig. 1, the work machines 2 present at the work site 3 include a shovel 2A, a bulldozer 2B, and a dump truck 2C.

[0012] In this embodiment, no operator is on board the work machine 2. The work machine 2 is remotely controlled. A remote control room 4 is installed outside the work machine 2. The remote control room 4 is installed in a remote location on the work site 3. An information terminal 5 and a remote control device 6 for remotely controlling the work machine 2 are each disposed in the remote control room 4. The information terminal 5 and the remote control device 6 are each located outside the work machine 2. The information terminal 5 includes a computer system disposed in the remote control room 4.

[0013] The remote control device 6 is operated by an operator in the remote control room 4. When operated by the operator, the remote control device 6 generates an operation signal for remotely operating the work machine 2. The operation signal generated in the remote control device 6 is input to the information terminal 5. The information terminal 5 transmits the operation signal from the remote control device 6 to the work machine 2 via the communication system 7.

[0014] The work machine 2 operates based on operation signals transmitted from an information terminal 5 located outside the work machine 2. A camera that acquires image data of the work site 3 is provided on at least one of the work machine 2 and the work site 3. The image data of the work site 3 is transmitted to the information terminal 5 via a communication system 7 and displayed on a display device of the information terminal 5. The operator can operate the remote control device 6 while checking the image data of the work site 3.

[0015] The communication system 7 may include a public communication line or a specific communication line. Examples of the communication system 7 include a mobile phone communication network or a satellite communication network. The communication system 7 may include the Internet or a local area network.

[0016] The management system 1 has a management server 8. The management server 8 includes a computer system. The management server 8 is able to communicate with the work machine 2 via a communication system 7. The management server 8 collects operation data of the work machine 2.

[0017] 2 is a diagram showing a shovel 2A according to this embodiment. The shovel 2A has a revolving body 9, a traveling body 10, a work implement 11, and a work implement cylinder 12.

[0018] The rotating unit 9 is rotatably supported by the running unit 10. The running unit 10 rotatably supports the rotating unit 9. The running unit 10 runs on the ground at the work site 3. It runs while being supported. The running unit 10 has a pair of tracks 10A. The excavator 2A runs as the tracks 10A rotate. The rotating unit 9 is an example of a vehicle body of the excavator 2A. The running unit 10 is an example of a traveling device for the excavator 2A.

[0019] The work implement 11 is attached to the revolving unit 9. The work implement 11 includes a boom 11A connected to the revolving unit 9, an arm 11B connected to the boom 11A, and a bucket 11C connected to the arm 11B. The work implement cylinder 12 includes a boom cylinder 12A that operates the boom 11A, an arm cylinder 12B that operates the arm 11B, and a bucket cylinder 12C that operates the bucket 11C.

[0020] 3 is a diagram showing a bulldozer 2B according to this embodiment. The bulldozer 2B has a vehicle body 13, a running body 14, an excavator 15, a ripper 16, a work machine cylinder 17, and a ripper cylinder 18.

[0021] The vehicle body 13 is supported by a running body 14. The running body 14 runs while supporting the vehicle body 13. The running body 14 has a pair of tracks 14A. The bulldozer 2B runs as the tracks 14A rotate. The running body 14 is an example of a traveling device for the bulldozer 2B.

[0022] The excavation work machine 15 performs excavation work, soil dozing work, or ground leveling work on a work target. The excavation work machine 15 is attached to the vehicle body 13. At least a portion of the excavation work machine 15 is disposed in front of the vehicle body 13. The excavation work machine 15 includes an excavation blade 15A. The work machine cylinder 17 operates the excavation blade 15A.

[0023] The ripper work machine 16 performs ripping work on a work object. The work object of the ripper work machine 16 includes the ground at the work site. The ripper work machine 16 is attached to the vehicle body 13. At least a portion of the ripper work machine 16 is disposed rearward of the vehicle body 13. The ripper work machine 16 includes a shank 16A. A ripper cylinder 18 operates the shank 16A.

[0024] <Types of Power Sources> Figure 4 is a diagram for explaining the types of power sources 30 of the work machine 2 according to this embodiment. Each of the multiple work machines 2 has a power source 30. The power source 30 is mounted on the body of the work machine 2.

[0025] At the work site 3, a plurality of work machines 2 with different types of power sources 30 are in operation. In this embodiment, the types of power sources 30 include fuel cells 31 and batteries 32. In the following description, a work machine 2 that uses a fuel cell 31 as its power source 30 will be referred to as an FC work machine 21, and a work machine 2 that uses a battery 32 as its power source 30 will be referred to as a battery work machine 22, as appropriate.

[0026] As shown in Fig. 4, the types of power sources 30 of the respective work machines 2 of the same model may be different. The types of power sources 30 of the respective multiple excavators 2A may be different. The types of power sources 30 of the respective multiple bulldozers 2B may be different.

[0027] 5 is a configuration diagram showing an FC work machine 21 according to this embodiment. The FC work machine 21 has a fuel cell 31, a hydrogen port 40, a hydrogen supply device 41, an oxygen supply device 42, a drain pipe 43, a gas-liquid separator 44, a recovery tank 45, a power supply port 46, a DC / DC converter 35A, an inverter 36A, an electric motor 37A, and a hydraulic pump 38A.

[0028] The fuel cell 31 generates electricity by chemically reacting hydrogen, which is a fuel gas, with oxygen, which is an oxidizing gas, and has a stack structure in which a plurality of unit cells are stacked.

[0029] The hydrogen supply device 41 supplies hydrogen to the anode of the fuel cell 31. The hydrogen supply device 41 stores hydrogen. The hydrogen supply device 41 includes a hydrogen tank. The hydrogen supply device 41 is connected to the hydrogen port 40. Hydrogen is filled into the hydrogen supply device 41 from the hydrogen port 40.

[0030] The oxygen supply device 42 supplies air containing oxygen to the cathode of the fuel cell 31. The oxygen supply device 42 includes an air cleaner and an air compressor.

[0031] The drain pipe 43 is connected to the fuel cell 31. The gas-liquid separator 44 is disposed in the drain pipe 43. The gas-liquid separator 44 separates water from the water vapor discharged from the fuel cell 31. The water separated in the gas-liquid separator 44 is stored in a recovery tank 45. The water separated in the gas-liquid separator 44 may be discharged to the atmosphere.

[0032] The power supply port 46 is connected to the fuel cell 31. At least a portion of the power generated by the fuel cell 31 can be supplied to electronic devices external to the FC work machine 21 via the power supply port 46. A rechargeable battery may be mounted on the FC work machine 21. The battery may be charged with power generated by the fuel cell 31. The power charged in the battery may be supplied via the power supply port 46 to a battery work machine 22 external to the FC work machine 21.

[0033] The DC / DC converter 35A boosts the voltage generated by the fuel cell 31. The DC / DC converter 35A supplies the direct current generated by the fuel cell 31 to the inverter 36A.

[0034] The inverter 36A converts the direct current from the DC / DC converter 35A into a three-phase alternating current and supplies it to the electric motor 37A. The electric motor 37A is driven based on the three-phase alternating current supplied from the inverter 36A.

[0035] The electric motor 37A is driven based on electric power from the inverter 36A. The hydraulic pump 38A is driven by the rotational force generated by the electric motor 37A. The hydraulic pump 38A discharges hydraulic oil. The hydraulic oil discharged from the hydraulic pump 38A is supplied to hydraulic actuators such as the work implement cylinder 12 and a swing motor and travel motor (not shown) provided on the FC work machine 21. Note that an electric actuator may be provided on the FC work machine 21 instead of a hydraulic actuator. When an electric actuator is provided on the FC work machine 21 instead of a hydraulic actuator, the hydraulic pump 38A is omitted.

[0036] 6 is a configuration diagram showing a battery work machine 22 according to this embodiment. The battery work machine 22 has a battery 32, a power receiving port 47, a charging device 48, a DC / DC converter 35B, an inverter 36B, an electric motor 37B, and a hydraulic pump 38B.

[0037] The battery 32 is an internal battery mounted on the battery work machine 22. The battery 32 is a rechargeable battery. The battery 32 includes a secondary battery. In this embodiment, the battery 32 includes a lithium ion battery (LiB).

[0038] The charging device 48 is connected to charging equipment provided outside the battery work machine 22 via the power receiving port 47. The charging device 48 includes an AC / DC converter. The charging device 48 may also include a DC / DC converter. The charging device 48 charges the battery 32 with power supplied from the charging equipment. In this embodiment, the charging equipment is the FC work machine 21.

[0039] The DC / DC converter 35B boosts the voltage from the battery 32. The functions of the DC / DC converter 35B, the inverter 36B, the electric motor 37B, and the hydraulic pump 38B are the same as the functions of the DC / DC converter 35A, the inverter 36A, the electric motor 37A, and the hydraulic pump 38A described above, and therefore description thereof will be omitted.

[0040] <Control System> Figure 7 is a block diagram showing a control system 50 for the FC work machine 21 according to this embodiment. The FC work machine 21 is equipped with a controller 51, a first connected sensor 56, a second connected sensor 57, a hydrogen sensor 58, and an output device 60. The controller 51 includes a computer. The controller 51 has a processor 52, a storage device 53, an input / output interface 54, and a communication interface 55.

[0041] The processor 52 includes a CPU (Central Processing Unit). The processor 52 may also include a GPU (Graphics Processing Unit). The storage device 53 includes a recording medium on which computer programs and data are recorded so as to be readable by the processor 52. The storage device 53 includes a system memory such as a RAM (Random Access Memory) or a ROM (Read Only Memory), and an auxiliary storage device. Examples of the auxiliary storage device include a hard disk or a semiconductor memory.

[0042] The input / output interface 54 is connected to each of the first connection sensor 56, the second connection sensor 57, the hydrogen sensor 58, and the output device 60. The processor 52 is connected to each of the first connection sensor 56, the second connection sensor 57, the hydrogen sensor 58, and the output device 60 via the input / output interface 54. The communication interface 55 communicates with the remote control device 6 via the communication system 7. The processor 52 receives operation signals from the remote control device 6 via the communication interface 55 and the communication system 7.

[0043] The first connection sensor 56 detects the connection between the hydrogen port 40 and a supply member 71 (described later). The first connection sensor 56 is disposed on the hydrogen port 40. However, the first connection sensor 56 may also be disposed on the supply member 71.

[0044] The second connection sensor 57 detects the connection between the power supply port 46 and a power supply member 72 (described later). The second connection sensor 57 is disposed in the power supply port 46. However, the second connection sensor 57 may also be disposed in the power supply member 72.

[0045] The hydrogen sensor 58 detects that hydrogen is being supplied to the hydrogen port 40. The hydrogen sensor 58 is disposed in the hydrogen port 40. The hydrogen sensor 58 may alternatively be disposed in the supply member 71.

[0046] The output device 60 outputs output data. Examples of the output device 60 include a light-emitting device, a display device, and an audio output device. The light-emitting device outputs light-emitting data as the output data. The display device outputs display data as the output data. The audio output device outputs audio data as the output data.

[0047] The processor 52 includes a designation unit 52A, a power generation command unit 52B, a power supply command unit 52C, and a control unit 52D. The designation unit 52A, the power generation command unit 52B, the power supply command unit 52C, and the control unit 52D each include a computer program, an algorithm, and data executed by the processor 52.

[0048] The designation unit 52A designates the output form of the output device 60 based on the type of power source 30 of the work machine 2. The designation unit 52A designates the output form of the output device 60 based on the type of power source 30 of the work machine 2 on which the designation unit 52A itself is mounted. The designation unit 52A outputs a control command for controlling the output device 60 so that the output device 60 operates in the designated output form.

[0049] The power generation command unit 52B outputs a control command to cause the fuel cell 31 to generate power. Hydrogen is supplied to the hydrogen port 40. Hydrogen is supplied from the hydrogen port 40 to the fuel cell 31 via the hydrogen supply device 41. The fuel cell 31 generates power using the hydrogen from the hydrogen port 40. The power generation command unit 52B can output a control command to cause the fuel cell 31 to generate power while hydrogen is being supplied to the hydrogen port 40.

[0050] The power supply command unit 52C outputs a control command to supply the electric power generated by the fuel cell 31 to the battery 32 mounted on the battery working machine 22. Electric power is supplied to the battery 32 from the power supply port 46 via the power supply member 72. The power supply command unit 52C outputs a control command to supply electric power from the power supply port 46 to the battery 32. The power supply command unit 52C can output a control command to supply electric power from the power supply port 46 to the battery 32 during at least a portion of the period when hydrogen is being supplied to the hydrogen port 40.

[0051] The control unit 52D outputs a control command to operate at least a part of the work machine 2 based on an operation signal from the remote control device 6.

[0052] 8 is a diagram showing an FC work machine 21 and a battery work machine 22 according to this embodiment. As shown in FIG. 8, a transport vehicle 80 carrying a plurality of hydrogen tanks 70 is arranged at a work site 3. The hydrogen tanks 70 are connected to the hydrogen port 40 of the FC work machine 21 by a supply member 71 such as a supply tube or a supply arm. The power supply port 46 of the FC work machine 21 is connected to the power receiving port 47 of the battery work machine 22 by a power supply member 72 such as a power supply tube or a power supply arm. The fuel cell 31 is mounted on the revolving body 9 of the FC work machine 21. The hydrogen port 40 is arranged on a first side surface 9L (left surface) of the revolving body 9. The power supply port 46 is arranged on a second side surface 9R (right surface) of the revolving body 9 opposite the first side surface 9L.

[0053] Hydrogen is supplied from the hydrogen tank 70 to the hydrogen port 40 via a supply member 71. Hydrogen is supplied to the hydrogen port 40 from outside the revolving bed 9. The fuel cell 31 of the FC work machine 21 generates electricity while hydrogen is being supplied from the hydrogen tank 70 to the hydrogen port 40 via the supply member 71. The fuel cell 31 generates electricity while receiving a supply of hydrogen from the hydrogen port 40. The power supply port 46 supplies the electric power generated by the fuel cell 31 to the battery 32 mounted on the battery work machine 22. The electric power generated by the fuel cell 31 is supplied to the battery 32 of the battery work machine 22 via the power supply port 46, the power supply member 72, the power receiving port 47, and the charging device 48. The battery 32 is charged with the electric power supplied from the fuel cell 31.

[0054] In this embodiment, the power supply command unit 52C outputs a control command to supply power from the power supply port 46 to the battery 32 during at least a portion of the period during which hydrogen is supplied to the hydrogen port 40. The power supply command unit 52C outputs a control command to supply power from the power supply port 46 to the battery 32 during at least a portion of the period during which the supply member 71 is connected to the hydrogen port 40.

[0055] In this embodiment, an output device 60 is arranged on the outer surface of the revolving bed 9 of the FC work machine 21, and an output device 60 is arranged on the outer surface of the body 13 of the battery work machine 22. Figure 8 shows an example in which the output device 60 is a light-emitting device. In the following description, the output device 60 will be referred to as the light-emitting device 60 as appropriate. The light-emitting surface of the light-emitting device 60 is arranged on the surface of the body of the work machine 2. The light-emitting surface of the light-emitting device 60 is directed towards the surroundings of the work machine 2. The output form of the output device 60 includes the light-emitting form of the light-emitting device 60.

[0056] The FC working machine 21 is provided with a first light-emitting device 61 that emits light in a first light-emitting mode. The battery working machine 22 is provided with a second light-emitting device 62 that emits light in a second light-emitting mode. In this embodiment, the light-emitting mode includes a light color. The first light-emitting device 61 emits a first color light. The second light-emitting device 62 emits a second color light that is different from the first color light. Because the light-emitting modes of the first light-emitting device 61 and the second light-emitting device 62 are different, it is possible to prevent, for example, the supply member 71 from being erroneously attached to the power receiving port 47 or the power supply member 72 from being erroneously attached to the hydrogen port 40.

[0057] <Control Method> Figure 9 is a flowchart showing the control method for the work machine 2 according to this embodiment. The power generation command unit 52B outputs a control command to cause the fuel cell 31 to generate power (step S1). The power generation command unit 52B determines whether or not the supply member 71 is connected to the hydrogen port 40 based on the detection data of the first connection sensor 56 (step S2). If it is determined in step S2 that the supply member 71 is connected to the hydrogen port 40 (step S2: Yes), the power generation command unit 52B determines whether or not hydrogen is being supplied to the hydrogen port 40 based on the detection data of the hydrogen sensor 58 (step S3). The fuel cell 31 generates power using hydrogen from the hydrogen port 40. The fuel cell 31 generates power while receiving a supply of hydrogen from a hydrogen tank 70 mounted on a transport vehicle 80 connected to the FC work machine 21.

[0058] If it is determined in step S3 that hydrogen is being supplied to the hydrogen port 40 (step S3: Yes), the power supply command unit 52C determines whether or not the power supply member 72 is connected to the power supply port 46 based on the detection data of the second connection sensor 57 (step S4). If it is determined in step S4 that the power supply member 72 is connected to the power supply port 46 (step S4: Yes), the power supply command unit 52C outputs a control command so that the power generated by the fuel cell 31 is supplied from the power supply port 46 to the battery 32 mounted on the battery working machine 22.

[0059] The power supply command unit 52C determines whether to terminate power supply from the power supply port 46 to the battery 32 (step S6). If it is determined in step S6 that power supply should be terminated (step S6: Yes), the power supply command unit 52C terminates power supply from the power supply port 46 to the battery 32. The power supply command unit 52C determines to terminate power supply when, for example, the charge amount of the battery 32 exceeds a predetermined value. If it is determined in step S6 that power supply should not be terminated (step S6: No), the power supply command unit 52C continues power supply from the power supply port 46 to the battery 32.

[0060] If it is determined in step S2 that the supply member 71 is not connected to the hydrogen port 40 (step S2: No), if it is determined in step S3 that hydrogen is not being supplied to the hydrogen port 40 (step S3: No), or if it is determined in step S4 that the power supply member 72 is not connected to the power supply port 46 (step S4: No), the power supply command unit 52C will not supply power from the power supply port 46 to the battery 32.

[0061] <Effects> As explained above, according to this embodiment, at the work site 3, the battery 32 of the battery work machine 22 is charged by the fuel cell 31 of the FC work machine 21. As a result, the battery 32 of the battery work machine 22 is charged even if, for example, there is no charging station at or near the work site 3. As a result, the battery work machine 22 can continue to operate.

[0062] In the FC work machine 21, the hydrogen port 40 is arranged on the first side surface 9L of the revolving unit 9, and the power supply port 46 is arranged on the second side surface 9R of the revolving unit 9. For example, if both the hydrogen port 40 and the power supply port 46 are arranged on the first side surface 9L, it may be difficult to smoothly route the supply member 71 and the power supply member 72. Furthermore, both the transport vehicle 80 and the battery work machine 22 are arranged in positions facing the first side surface 9L. In this embodiment, the hydrogen port 40 is arranged on the first side surface 9L of the revolving unit 9, and the power supply port 46 is arranged on the second side surface 9R of the revolving unit 9, so that the supply member 71 and the power supply member 72 can be smoothly routed. Furthermore, the transport vehicle 80 is arranged in a position facing the first side surface 9L, and the battery work machine 22 is arranged in a position facing the second side surface 9R.

[0063] In this embodiment, power is supplied from the power supply port 46 to the battery 32 for at least part of the period during which hydrogen is supplied to the hydrogen port 40. This allows the fuel cell 31 to stably generate power while preventing a shortage of hydrogen in the hydrogen supply device 41. Since power is supplied from the power supply port 46 to the battery 32 while the fuel cell 31 is stably generating power, the battery 32 is fully charged.

[0064] In this embodiment, power may be supplied from the power supply port 46 to the battery 32 during at least a portion of the period during which hydrogen is supplied to the fuel cell 31. Power may be supplied from the power supply port 46 to the battery 32 during at least a portion of the period during which hydrogen is supplied to the hydrogen port 40 and the fuel cell 31 is generating power.

[0065] Second Embodiment A second embodiment will be described below. In the following description, components that are the same as or equivalent to those in the first embodiment described above will be denoted by the same reference numerals, and descriptions of those components will be simplified or omitted.

[0066] 10 is a block diagram showing a control system 50 for the FC work machine 21 according to this embodiment. In this embodiment, the FC work machine 21 is equipped with a travel sensor 81, a swing sensor 82, and a work implement sensor 83.

[0067] The travel sensor 81 detects the movement of the running object 10. The travel sensor 81 detects the travel speed of the running object 10. The travel sensor 81 detects whether the running object 10 is stationary or not.

[0068] The rotation sensor 82 detects the movement of the rotating structure 9. The rotation sensor 82 detects the rotation speed of the rotating structure 9. The rotation sensor 82 detects whether the rotating structure 9 is stationary or not.

[0069] The work machine sensor 83 detects the operation of the work machine 11. The work machine sensor 83 detects the attitude of the work machine 11. The attitude of the work machine 11 includes the angle of the work machine 11. The work machine sensor 83 detects whether the work machine 11 is stationary or not.

[0070] When hydrogen is supplied to the hydrogen port 40 and the running vehicle 10 is stationary, the power supply command unit 52C outputs a control command to supply power from the power supply port 46 to the battery 32. The power supply command unit 52C can determine whether the running vehicle 10 is stationary or not based on the detection data of the travel sensor 81. When the running vehicle 10 is stationary, hydrogen is supplied to the hydrogen port 40 and power is supplied from the power supply port 46 to the battery 32, so that the supply of hydrogen to the hydrogen port 40 and the supply of power to the battery 32 are carried out smoothly.

[0071] The power supply command unit 52C may output a control command to supply power from the power supply port 46 to the battery 32 when hydrogen is supplied to the hydrogen port 40 and the rotating unit 9 is stationary. The power supply command unit 52C can determine whether the rotating unit 9 is stationary or not based on the detection data of the rotation sensor 82. When the rotating unit 9 is stationary, hydrogen is supplied to the hydrogen port 40 and power is supplied from the power supply port 46 to the battery 32, so that the supply of hydrogen to the hydrogen port 40 and the supply of power to the battery 32 are carried out smoothly.

[0072] The power supply command unit 52C may output a control command to supply power from the power supply port 46 to the battery 32 when hydrogen is supplied to the hydrogen port 40 and the work machine 11 is stationary. The power supply command unit 52C can determine whether the work machine 11 is stationary or not based on the detection data of the work machine sensor 83. When the work machine 11 is stationary, hydrogen is supplied to the hydrogen port 40 and power is supplied from the power supply port 46 to the battery 32, so that the supply of hydrogen to the hydrogen port 40 and the supply of power to the battery 32 are carried out smoothly.

[0073] The power supply command unit 52C may output a control command to supply power from the power supply port 46 to the battery 32 when hydrogen is supplied to the hydrogen port 40 and the rotating body 9, the running body 10, and the work machine 11 are each stationary.

[0074] The power supply command unit 52C may output a control command to supply power from the power supply port 46 to the battery 32 when hydrogen is supplied to the hydrogen port 40 and at least a portion of the work implement 11 is grounded. The power supply command unit 52C may output a control command to supply power from the power supply port 46 to the battery 32 when hydrogen is supplied to the hydrogen port 40 and the bucket 11C of the work implement 11 is grounded. As described above, the work implement sensor 83 is capable of detecting the attitude (angle) of the work implement 11. The power supply command unit 52C can determine whether the bucket 11C is grounded based on the detection data of the work implement sensor 83.

[0075] If the control unit 52D receives an operation signal from the remote control device 6 during the period when power is being supplied to the battery 32 from the power supply port 46, the control unit 52D may cancel the operation signal. Even if the control unit 52D receives an operation signal from the remote control device 6 during the period when power is being supplied to the battery 32 from the power supply port 46, the control unit 52D will not operate the FC work machine 21. Because the FC work machine 21 does not operate, hydrogen is smoothly supplied to the hydrogen port 40 and power is smoothly supplied to the battery 32.

[0076] Note that if the FC work machine 21 is provided with a driver's cab in which an operator sits, a lock lever 84 may be disposed in the driver's cab. The lock lever 84 is operated to disable each of the rotating body 9 and the work implement 11. The lock lever 84 is disposed in a boarding passage connecting an entrance / exit provided in the driver's cab and the driver's seat. The lock lever 84 is operated to move between a locked position and a free position. When the lock lever 84 is operated to the locked position, the flow paths of the hydraulic circuits, including the hydraulic pump, etc., are blocked, and the rotating body 9 and the work implement 11 are placed in a locked state in which they are disabled for operation. Furthermore, when the lock lever 84 is operated to the locked position, the boarding passage is opened. With the boarding passage opened, the operator can pass through the boarding passage. When the lock lever 84 is operated to the free position, the flow paths of the hydraulic circuits, including the hydraulic pump, etc., are opened, and the rotating body 9 and the work implement 11 are placed in a free state in which they can operate. Furthermore, when the lock lever 84 is operated to the free position, the boarding passage is closed. The power supply command unit 52C may output a control command to supply power from the power supply port 46 to the battery 32 when hydrogen is supplied to the hydrogen port 40 and the rotating body 9 and the work machine 11 are each locked by operating the lock lever 84.

[0077] [Other Embodiments] In the above-described embodiment, the charging device 48 of the battery work machine 22 charges the battery 32 with power supplied from the FC work machine 21. In other words, the charging facility for charging the battery 32 is the FC work machine 21. The charging facility for charging the battery 32 may be another battery work machine, or may be a fixed charging facility not shown.

[0078] In the example shown in FIG. 8 , a hydrogen tank 70 filled with hydrogen is transported to a transport vehicle 80. The hydrogen may be transported stored in a hydrogen carrier. The organic chemical hydride method is a known hydrogen storage technology. The organic chemical hydride method involves hydrogenating an aromatic compound, storing hydrogen in the aromatic compound, and dehydrogenating the aromatic compound when the hydrogen is used to release hydrogen from the aromatic compound. Hydrogenation refers to a chemical reaction that adds hydrogen to the aromatic compound molecule. Dehydrogenation refers to a chemical reaction that removes hydrogen from the aromatic compound. Examples of hydrogen carriers include aromatic compounds and ammonia. Examples of aromatic compounds include benzene, toluene, xylene, mesitylene, naphthalene, methylnaphthalene, anthracene, or a combination thereof. For example, toluene can be hydrogenated to produce methylcyclohexane (MCH) as a hydrogen carrier. Dehydrogenation is performed using a cracking device.

[0079] 8, hydrogen is supplied to the FC work machine 21 from a hydrogen tank 70 mounted on a transport vehicle 80. Hydrogen may also be supplied to the FC work machine 21 from a mobile hydrogen station. Hydrogen may also be supplied to the FC work machine 21 from a fixed hydrogen station installed at the work site 3.

[0080] In the example shown in Figure 8, the hydrogen port 40 is arranged on the first side surface 9L (left surface) of the rotating body 9, and the power feed port 46 is arranged on the second side surface 9R (right surface) of the rotating body 9. Both the hydrogen port 40 and the power feed port 46 may be arranged on the first side surface 9L of the rotating body 9. Both the hydrogen port 40 and the power feed port 46 may be arranged on the second side surface 9R of the rotating body 9. The hydrogen port 40 may be arranged on the rear surface of the rotating body 9, and the power feed port 46 may be arranged on either the first side surface 9L or the second side surface 9R of the rotating body 9. The power feed port 46 may be arranged on the rear surface of the rotating body 9, and the hydrogen port 40 may be arranged on either the first side surface 9L or the second side surface 9R of the rotating body 9.

[0081] In the above-described embodiment, the work machine 2 is remotely controlled by the remote control device 6. An operator may board the work machine 2 and operate an operation device arranged on the work machine 2 to operate the work machine 2. The work machine 2 may also be an autonomous work machine that operates autonomously without being operated by an operator.

[0082] 1...Management system, 2...Construction machine, 2A...Shovel, 2B...Bulldozer, 2C...Dump truck, 3...Work site, 4...Remote control room, 5...Information terminal, 6...Remote control device, 7...Communication system, 8...Management server, 9...Slewing body (vehicle body), 9L...First side, 9R...Second side, 10...Traveling body (traveling device), 10A...Crawler, 11...Working machine, 11A...Boom, 11B...Arm, 11C...Bucket, 12...Working machine cylinder, 12A ...Boom cylinder, 12B...Arm cylinder, 12C...Bucket cylinder, 13...Vehicle body, 14...Travel body, 14A...Crawler, 15...Excavation work machine, 15A...Excavation blade, 16...Ripper work machine, 16A...Shank, 17...Work machine cylinder, 18...Ripper cylinder, 21...FC work machine, 22...Battery work machine, 30...Power source, 31...Fuel cell, 32...Battery, 35A...DC / DC converter, 35B...DC / DC converter inverter, 36A... inverter, 36B... inverter, 37A... electric motor, 37B... electric motor, 38A... hydraulic pump, 38B... hydraulic pump, 40... hydrogen port, 41... hydrogen supply device, 42... oxygen supply device, 43... drain pipe, 44... gas-liquid separator, 45... recovery tank, 46... power supply port, 47... power receiving port, 48... charging device, 50... control system, 51... controller, 52... processor, 52A... designation unit, 52 B...power generation command unit, 52C...power supply command unit, 52D...control unit, 53...storage device, 54...input / output interface, 55...communication interface, 56...first connection sensor, 57...second connection sensor, 58...hydrogen sensor, 60...output device, 61...first light-emitting device, 62...second light-emitting device, 70...hydrogen tank, 71...supply member, 72...power supply member, 81...travel sensor, 82...swing sensor, 83...work equipment sensor, 84...lock lever.

Claims

1. A work machine comprising: a vehicle body; a hydrogen port to which hydrogen is supplied from outside the vehicle body; a fuel cell that generates electricity while receiving a supply of hydrogen from the hydrogen port; and a power supply port for supplying the electricity generated by the fuel cell to a battery mounted on the work machine.

2. The work machine according to claim 1, wherein the hydrogen port is disposed on a first side surface of the vehicle body, and the power supply port is disposed on a second side surface of the vehicle body opposite the first side surface.

3. A work machine according to claim 1, further comprising a processor, wherein the processor outputs a control command to supply power from the power supply port to the battery during at least a portion of the period during which hydrogen is supplied to the hydrogen port.

4. The work machine according to claim 3, wherein the processor outputs the control command when the vehicle body is stationary.

5. A work machine as described in claim 4, comprising a traveling device that supports the vehicle body so that it can turn, and a work implement attached to the vehicle body, and the processor outputs the control command when the vehicle body, the traveling device, and the work implement are each stationary.

6. A work machine as described in claim 4, comprising a traveling device that supports the vehicle body so that it can turn, and a work implement attached to the vehicle body, and the processor outputs the control command when at least a portion of the work implement is in contact with the ground.

7. A work machine as described in claim 4, comprising: a traveling device that supports the vehicle body so that it can turn; a work implement attached to the vehicle body; and an operating device that is operated to operate at least one of the vehicle body, the traveling device, and the work implement, wherein when the processor receives an operating signal from the operating device during a period in which power is being supplied from the power supply port, the processor cancels the operating signal.

8. A method of charging a work machine, comprising: supplying hydrogen to a fuel cell mounted on a first work machine; causing the fuel cell to generate electricity using the hydrogen; and supplying the electricity generated by the fuel cell to a battery mounted on a second work machine.

9. The charging method for a work machine according to claim 8, wherein power is supplied to the battery during at least a portion of the period during which hydrogen is supplied to the fuel cell.

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