Operating machinery, fuel cell systems, and methods for controlling fuel cell systems

Abstract

Upon receiving a command signal to start the operating machinery, the main control unit outputs a start command to the first fuel cell module among multiple fuel cell modules. Upon detecting the start of the first fuel cell module, the main control unit outputs a start command to a second fuel cell module, which is different from the first fuel cell module.

Description

Technical Field

[0001] This disclosure relates to operating machinery, fuel cell systems, and methods for controlling fuel cell systems.

[0002] This application claims priority based on Japanese Patent Application No. 2023-203174, filed in Japan on November 30, 2023, the contents of which are incorporated herein by reference. Background Technology

[0003] In the field of construction machinery, there are known ultra-large trucks equipped with fuel cell systems containing multiple fuel cell modules, as disclosed in Patent Document 1. The fuel cell generates electricity through the chemical reaction of hydrogen and oxygen. Hydrogen, as fuel, is supplied from a tank filled with hydrogen gas. Oxygen is supplied from the atmosphere. Therefore, in order to operate the fuel cell, auxiliary equipment such as a fuel pump and an air compressor are provided.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Specification of U.S. Patent Application 2022 / 0173459 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, the auxiliary equipment used to operate the fuel cell is electrically powered. Therefore, the fuel cell system requires an energy storage device to accumulate the power needed for startup. In the case of a fuel cell system with multiple fuel cells, the more fuel cells there are, the more power is required for startup, thus necessitating a large-capacity energy storage device. On the other hand, it is desirable to reduce the size of the energy storage device installed in the fuel cell system.

[0009] One example of the purpose of this disclosure is to provide a working machine, a fuel cell system, and a method for controlling the fuel cell system that can reduce the amount of electricity that should be pre-stored at startup in a working machine equipped with multiple fuel cells.

[0010] Methods for solving problems

[0011] According to one aspect of this disclosure, a work-operated machine includes a working device, comprising: a fuel cell system having multiple fuel cell modules supported on the machine's body and connected to a busbar; and a main control device. Upon receiving a command signal to start the work-operated machine, the main control device outputs a start command to a first fuel cell module among the multiple fuel cell modules. Upon detecting the start of the first fuel cell module, the main control device outputs a start command to a second fuel cell module, which is different from the first fuel cell module.

[0012] Invention Effects

[0013] According to the above scheme, as an example, the operating machinery can reduce the amount of electricity that should be stored in advance when starting up. Attached Figure Description

[0014] Figure 1 This is a schematic diagram showing the structure of the working machine according to the first embodiment.

[0015] Figure 2 This is a schematic diagram showing the structure of the cab of the operating machine according to the first embodiment.

[0016] Figure 3 This is a schematic block diagram showing the structure of the fuel cell system and drive system of the working machine according to the first embodiment.

[0017] Figure 4 This is a flowchart illustrating the control process during startup of the work machinery according to the first embodiment.

[0018] Figure 5 This is a schematic block diagram showing the structure of the computer according to the first embodiment. Detailed Implementation

[0019] <First Implementation Method>

[0020] Structure of Operation Machinery 1

[0021] Figure 1 This is a schematic diagram showing the structure of the work machine 1 according to the first embodiment. The work machine 1 of the first embodiment is, for example, a hydraulic excavator. The work machine 1 includes a traveling body 110, a slewing body 120, a working device 130, a cab 140, and a main control device 145. As a hydraulic excavator, the work machine 1 excavates and levels the ground, such as sand and soil, at a work site. The traveling body 110 and the slewing body 120 constitute the vehicle body.

[0022] The traveling body 110 supports the working machine 1 so that it can move. The traveling body 110 has a pair of tracks, left and right. The working machine 1 moves forward, turns around or moves backward by rotating the pair of tracks.

[0023] The rotating body 120 is supported on the traveling body 110 in a manner that allows it to rotate around a rotation center. The rotating body 120 supports the working device 130, the driver's cab 140, the machine room 150, and the fuel cell system 20.

[0024] The cab 140 is a place for the operator of the working machine 1 to sit, operate, and control it. The cab 140 is located, for example, on the left side of the front end of the rotating body 120. The main control unit 145 is installed in the cab 140 of the working machine 1.

[0025] The fuel cell system 20, described later, is configured in the machine compartment 150. The machine compartment 150 is located, for example, behind the driver's cab 140. The machine compartment 150 forms a space for configuring the fuel cell system 20.

[0026] The working device 130 is supported on the body of the working machine 1 in an operable manner. The working device 130 includes a boom 131, a stick 132, and an accessory 133 as a working tool. The accessory 133 is an example of a working tool. Figure 1 In the example shown, accessory 133 is a bucket. The base end of the boom 131 is rotatably mounted to the front end of the slewing body 120. The base end of the stick 132 is rotatably mounted to the front end of the boom 131. Accessory 133 is rotatably mounted to the front end of the stick 132.

[0027] The working machine 1 has multiple actuators for driving the working device 130. The multiple actuators include, for example, a boom cylinder 131C, a stick cylinder 132C, and an accessory cylinder 133C.

[0028] Boom cylinder 131C is a hydraulic cylinder used to drive boom 131. The base end of boom cylinder 131C is mounted on slewing body 120. The front end of boom cylinder 131C is mounted on boom 131.

[0029] The boom cylinder 132C is a hydraulic cylinder used to drive the boom 132. The base end of the boom cylinder 132C is mounted on the boom 131. The front end of the boom cylinder 132C is mounted on the boom 132.

[0030] Accessory cylinder 133C is a hydraulic cylinder used to drive accessory 133. The base end of accessory cylinder 133C is mounted on stick 132. The front end of accessory cylinder 133C is mounted on accessory 133.

[0031] The Structure of the Driver's Cab

[0032] Figure 2 This is a schematic diagram showing the structure of the cab 140 of the operating machine 1 according to the first embodiment.

[0033] like Figure 2 As shown, the cab 140 is equipped with a driver's seat 141, a left control lever 142LO, a right control lever 142RO, a left foot pedal 142LF, a right foot pedal 142RF, a left travel lever 142LT, a right travel lever 142RT, and a start operation switch 143.

[0034] The left control lever 142LO and the right control lever 142RO are positioned to the left and right of the driver's seat 141 inside the cab 140. In addition, the left foot pedal 142LF and the right foot pedal 142RF are positioned inside the cab 140, in front of the driver's seat 141, on the floor.

[0035] The left control lever 142LO, located on the left side facing forward of the cab, is used for rotating the slewing body 120 and digging / unloading the boom 132. The right control lever 142RO, located on the right side facing forward of the cab, is used for digging / unloading the accessory 133 and raising / lowering the boom 131.

[0036] Additionally, the left travel lever 142LT and right travel lever 142RT are operating devices used for motion control of the traveling body 110, i.e., the travel control of the working machine 1. The left travel lever 142LT, positioned on the left side facing forward of the cab, corresponds to the rotation drive of the left track of the traveling body 110. The right travel lever 142RT, positioned on the right side facing forward of the cab, corresponds to the rotation drive of the right track of the traveling body 110. It should be noted that the left foot pedal 142LF and right foot pedal 142RF are linked to the left travel lever 142LT and right travel lever 142RT respectively, and travel control can also be performed via the left foot pedal 142LF and right foot pedal 142RF.

[0037] Figure 3 This is a schematic block diagram showing the structure of the fuel cell system 20 and drive system 30 of the work machine 1 according to the first embodiment. The work machine 1 includes a fuel cell system 20 and a drive system 30. The fuel cell system 20 generates electricity to drive the work machine 1. The fuel cell system 20 generates electricity to drive the drive system 30. The electricity generated by the fuel cell system 20 is output to the drive system 30 via bus B. The drive system 30 drives the working device 130 and the traveling body 110 using the electricity generated by the fuel cell system 20.

[0038] The fuel cell system 20 has multiple fuel cell modules 21 and energy storage module 22 connected in parallel with bus B.

[0039] Each fuel cell module 21 includes a fuel cell 211, a power converter 212, auxiliary equipment 213, and a fuel cell control device 214.

[0040] Fuel cell 211 generates electricity through an electrochemical reaction between hydrogen and oxygen. Power converter 212, such as a DC-DC converter, is configured to control the power generated by fuel cell 211. Power converter 212 converts the power generated by fuel cell 211 and supplies it to bus B. Auxiliary equipment 213 is a device used to operate fuel cell 211. Fuel cell module 21 includes a hydrogen pump for supplying hydrogen to fuel cell 211, an air compressor for generating compressed air for supplying to fuel cell 211, and a water pump for supplying cooling water to cool fuel cell 211, etc., as auxiliary equipment 213. Fuel cell control device 214 controls fuel cell module 21 according to instructions from main control device 145. Fuel cell control device 214 monitors the state of fuel cell 211 and outputs data indicating the state of fuel cell 211 to main control device 145. Fuel cell control device 214 is an example of a monitoring device.

[0041] The energy storage module 22 includes an energy storage device 221 and a power converter 222. The energy storage device 221 is configured to store or discharge residual power from bus B. The power converter 222, for example, is a DC-DC converter that controls the input and output of power to the energy storage device 221. The power converter 222 outputs power from the energy storage device 221 according to instructions from the main control device 145. The energy storage device 221 is, for example, a capacitor.

[0042] The drive system 30 includes a hydraulic drive module 31 and a slewing module 32.

[0043] The hydraulic drive module 31 includes an inverter 311, an electric motor 312, a hydraulic pump 313, and a hydraulic actuator 314. The inverter 311 converts direct current from bus B into three-phase alternating current and supplies it to the electric motor 312. The electric motor 312 rotates due to the supplied three-phase alternating current, driving the hydraulic pump 313. The hydraulic pump 313 discharges working oil for supplying the hydraulic actuator 314. The working oil discharged from the hydraulic pump 313 is supplied to the hydraulic actuator 314 via a control valve (not shown). The hydraulic actuator 314 is driven by the supplied working oil. The hydraulic actuator 314 includes a boom cylinder 131C, a stick cylinder 132C, an accessory cylinder 133C, and a travel motor 134. The rotational force generated by the travel motor 134 is transmitted to the travel body 110.

[0044] The slewing module 32 includes an inverter 321 and an electric slewing motor 322. The inverter 321 converts the DC current from bus B into three-phase AC current and supplies it to the electric slewing motor 322. The electric slewing motor 322 rotates by the supplied three-phase AC current, causing the slewing body 120 to rotate relative to the traveling body 110.

[0045] Control during startup of operating machinery 1

[0046] Figure 4 This is a flowchart illustrating the control process when the operating machine 1 of the first embodiment is started.

[0047] When the operator operates the start operation switch 143, the start operation switch 143 outputs a command signal to the main control device 145 to start the working machine 1. The start operation switch 143 is, for example, a switch that outputs a command signal to start the working machine 1 when pressed by the operator. If a command signal to start the working machine 1 is input from the start operation switch 143 to the main control device 145 through the operator's operation, the main control device 145 starts the fuel cell system 20 in the following sequence. First, the main control device 145 outputs a command signal to the power converter 222 of the energy storage module 22 to supply a specified amount of power to the bus B (step S1). The specified power is only required to drive the auxiliary equipment 213 of at least one of the multiple fuel cell modules 21.

[0048] Next, the main control unit 145 selects at least one fuel cell module 21 from the plurality of fuel cell modules 21 to be started initially (step S2). Hereinafter, the selected fuel cell module 21 will be referred to as the first fuel cell module. The first fuel cell module can be predetermined, randomly selected by the main control unit 145, or selected in an order that schedules the modules with the same total operating time. It should be noted that when the power converter 222 of the energy storage device module 22 supplies power to bus B only for the auxiliary equipment 213 that drives the plurality of fuel cell modules 21, the plurality of fuel cell modules 21 can also be selected as the first fuel cell module.

[0049] The main control unit 145 outputs a start command to the fuel cell control unit 214 of the first fuel cell module selected in step S2 (step S3). Upon receiving the start command, the fuel cell control unit 214 of the first fuel cell module uses the power from bus B to drive the auxiliary equipment 213. That is, at this time, the auxiliary equipment 213 of the first fuel cell module is driven by the power supplied from the energy storage device 221. When hydrogen and oxygen are supplied to the fuel cell 211 of the first fuel cell module through the drive of the auxiliary equipment 213, the fuel cell 211 reacts the hydrogen and oxygen to generate electricity.

[0050] The main control unit 145 detects the start-up of the fuel cell 211 of the first fuel cell module (step S4). Specifically, the fuel cell control unit 214 of the first fuel cell module monitors the state of the fuel cell 211 and outputs data indicating the state of the fuel cell 211. The state of the fuel cell 211 includes states such as stopped and start-up complete. Data indicating the start-up complete state is an example of a notification indicating that the fuel cell 211 is operating. The main control unit 145 receives data output from the fuel cell control unit 214 of the first fuel cell module and detects the state of the fuel cell 211. Based on the data from the fuel cell control unit 214 of the first fuel cell module, the main control unit 145 detects the start-up of the fuel cell 211 of the first fuel cell module.

[0051] Upon detecting the start-up of the fuel cell 211 in the first fuel cell module, the main control unit 145 outputs a command signal to the fuel cell control unit 214 of the first fuel cell module to supply a specified amount of power to bus B (step S5). The specified power is sufficient to drive the auxiliary equipment 213 of at least one of the multiple fuel cell modules 21. Based on the command signal from the main control unit 145, the fuel cell control unit 214 of the first fuel cell module causes the power converter 212 to supply the power generated by the fuel cell 211 to bus B.

[0052] Next, the main control unit 145 selects at least one fuel cell module 21 to be started from the plurality of fuel cell modules 21 that have not yet been started (step S6). Hereinafter, the fuel cell module 21 selected after the first fuel cell module will be referred to as the second fuel cell module. The second fuel cell module is a different fuel cell module 21 from the first fuel cell module. The second fuel cell module can be predetermined, randomly selected by the main control unit 145, or selected in an order that schedules the total operating time in the same manner. It should be noted that the main control unit 145 selects the second fuel cell module that can use the electricity output from the already running first fuel cell module to drive the auxiliary equipment 213. It should be noted that when the fuel cell 211 of the first fuel cell module supplies power to bus B only to drive the auxiliary equipment 213 of the plurality of fuel cell modules 21, the plurality of fuel cell modules 21 can also be selected as the second fuel cell module.

[0053] The main control unit 145 outputs a start command to the fuel cell control unit 214 of the second fuel cell module selected in step S6 (step S7). Upon receiving the start command, the fuel cell control unit 214 of the second fuel cell module drives the auxiliary equipment 213 using the power from bus B. The remaining power stored in the energy storage device 221 may be depleted, but the auxiliary equipment 213 of the second fuel cell module can be driven by the power supplied from the first fuel cell module. When hydrogen and oxygen are supplied to the fuel cell 211 of the second fuel cell module through the drive of the auxiliary equipment 213, the fuel cell 211 reacts the hydrogen and oxygen to generate electricity.

[0054] The main control unit 145 detects the start-up of the fuel cell 211 of the second fuel cell module (step S8). Specifically, the fuel cell control unit 214 of the second fuel cell module monitors the state of the fuel cell 211 and outputs data indicating the state of the fuel cell 211. The state of the fuel cell 211 includes states such as stopped and start-up complete. Data indicating the start-up complete state is an example of a notification indicating that the fuel cell 211 is operating. The main control unit 145 receives the data output from the fuel cell control unit 214 of the second fuel cell module and determines the state of the fuel cell 211. The main control unit 145 detects the start-up of the fuel cell 211 of the second fuel cell module based on the data from the fuel cell control unit 214 of the second fuel cell module.

[0055] When the main control unit 145 detects the start-up of the fuel cell 211 of the second fuel cell module, it outputs a command signal to the fuel cell control unit 214 of the second fuel cell module to supply a specified amount of power to bus B (step S9). Based on the command signal from the main control unit 145, the fuel cell control unit 214 of the second fuel cell module causes the power converter 212 to supply the power generated by the fuel cell 211 to bus B.

[0056] Subsequently, while there is an unstarted fuel cell module 21, the main control unit 145 drives the auxiliary equipment 213 of the unstarted fuel cell module 21 using the power output from the already running fuel module.

[0057] Once all fuel cell modules 21 have started up, the main control unit 145 allows the operation of the working machine 1 corresponding to the operator's operation of the operating device. The main control unit 145 accepts the operator's operation of the operating device and outputs control commands to the inverter 311 of the hydraulic drive module 31 and the inverter 321 of the rotary module 32 according to the operation amount.

[0058] Function / Effect

[0059] Thus, the main control device 145 of the first embodiment functions as follows. When the working machine 1 starts, if the main control device 145 receives a command signal to start the fuel cell system 20 when all the fuel cells 211 have stopped, it outputs a command signal to drive the auxiliary equipment 213 of the first fuel cell module among the multiple fuel cell modules 21. When the first fuel cell module is running, the main control device 145 outputs a command signal to drive the auxiliary equipment 213 of the second fuel cell module among the multiple fuel cell modules 21.

[0060] Therefore, the energy storage device 221 only needs to store the power that should be supplied to the auxiliary equipment 213 until the startup of at least the first fuel cell module among the plurality of fuel cell modules 21 is completed. Therefore, the energy storage device 221 may not have the capacity of the auxiliary equipment 213 to drive all fuel cell modules 21 during startup. That is, the fuel cell system 20 of the first embodiment enables the miniaturization of the energy storage device 221. Furthermore, when the energy storage device 221 is a capacitor, its capacity relative to its size is small compared to a battery; therefore, by implementing the control of the first embodiment, the energy storage device 221 equipped with the work machine 1 can be miniaturized. Therefore, the fuel cell system 20 of the first embodiment can reduce the amount of power that should be pre-stored before startup.

[0061] Figure 5 This is a schematic block diagram showing the structure of the computer according to the first embodiment.

[0062] The computer 90 has a processor 91, main memory 92, storage 93, and interface 94.

[0063] The aforementioned main control unit 145 and fuel cell control unit 214 are mounted on the computer 90. Furthermore, the operations of each of the aforementioned processing units are stored in memory 93 as programs. The processor 91 reads the program from memory 93, expands it in main memory 92, and executes the aforementioned processing according to the program. Additionally, the processor 91 secures the corresponding storage area in main memory 92 according to the program for each of the aforementioned storage units. Examples of the processor 91 include a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), and a microprocessor.

[0064] The program can also be a part of the program used to implement the functions that enable the computer 90 to perform. For example, the program can also function by combining with other programs already stored in memory or with other programs installed on other devices. It should be noted that, in other embodiments, the computer 90 may also have a custom LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device) based on or instead of the above structure. Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). In this case, part or all of the functions implemented by the processor 91 can be implemented by this integrated circuit. Such an integrated circuit is also included in one example of a processor. In addition, in other embodiments, the computer 90 may also be virtualized on one or more computers.

[0065] Examples of storage devices 93 include magnetic disks, optical disks, optical discs, and semiconductor memories. Storage device 93 can be an internal medium directly connected to the bus of computer 90, or an external medium connected to computer 90 via interface 94 or a communication line. Furthermore, when the program is distributed to computer 90 via a communication line, the receiving computer 90 can also expand the program in main memory 92 and execute the aforementioned processing. In at least one embodiment, storage device 93 is a non-transitory tangible storage medium.

[0066] Alternatively, the program can be a part of a program used to implement the aforementioned functions. Furthermore, the program can also be a so-called differential file (differential program) that implements the aforementioned functions by combining it with other programs already stored in memory 93.

[0067] <Other Implementation Methods>

[0068] The above description of one embodiment is based on the accompanying drawings. However, the specific structure is not limited to the structure described above, and various design changes can be made.

[0069] For example, the main control device 145 in the above-described embodiment can be a single computer, or the structure of the main control device 145 can be separately configured in multiple computers, with the multiple computers cooperating with each other to function as the main control device 145. In this case, it is also possible that some of the computers constituting the main control device 145 are installed inside the machine 1, while other computers are located outside the machine 1.

[0070] Alternatively, the main control device 145 in the above-described embodiment may also have the functions of the fuel cell control device 214. In this case, each fuel cell module 21 may not have a fuel cell control device 214, and the power converter 212 and auxiliary equipment 213 of each fuel cell module 21 may operate based on command signals from the main control device 145. Furthermore, the main control device 145 may also function as a monitoring device to monitor the status of the fuel cell 211.

[0071] Furthermore, the operating machine 1 in the above-described embodiment is a hydraulic excavator, but it is not limited to this. For example, the operating machine 1 in other embodiments may also be a wheel loader, a dump truck, or other operating machines.

[0072] Furthermore, in the above embodiments, a capacitor was cited as an example of an energy storage device 221, but it is not limited to this. For example, the energy storage device 221 of the working machine 1 in other embodiments may also be a battery.

[0073] It should be noted that in the above implementation methods, such as Figure 3 As shown, the working machine 1 is described with two fuel cell modules, but it is not limited to this. Other embodiments of the working machine 1 may have three or more fuel cell modules.

[0074] Furthermore, in the above embodiment, the start operation switch 143 for starting the working machine 1 is configured as a switch that outputs a start signal when pressed by the operator, but it is not limited to this. The start operation switch 143 may also be a key switch, for example, having a lock cylinder for key insertion, operated by inserting the key into the lock cylinder and rotating the key from the off position to the start position via the key on position. Alternatively, the start operation switch 143 may be a portable operating device held by the operator, and wireless communication may be established between the portable operating device and the main control device 145, with the start of the working machine 1 initiated upon successful communication. The portable operating device may be, for example, a remote control key with a built-in electronic chip, or a portable computer device such as a smartphone or portable information terminal. Additionally, the start operation switch 143 may also be configured to be located at a remote location, enabling remote operation to start the working machine 1.

[0075] Industrial availability

[0076] According to this disclosure, as an example, the operating machinery can reduce the amount of electricity that should be pre-stored when starting up.

[0077] Explanation of reference numerals in the attached figures:

[0078] 1…Working machinery; 110…Traveling body; 120…Slewing body; 130…Working device; 131…Boom; 131C…Boom cylinder; 132…Stick; 132C…Stick cylinder; 133…Accessories; 133C…Accessory cylinder; 134…Traveling motor; 140…Cab; 141…Driver's seat; 142LF…Left foot pedal; 142LO…Left control lever; 142LT…Left travel lever; 142RF…Right foot pedal; 142RO…Right control lever; 142RT…Right travel lever; 145…Main control Device; 20… Fuel cell system; 21… Fuel cell module; 211… Fuel cell; 212… Power converter; 213… Auxiliary equipment; 214… Fuel cell control device; 22… Energy storage module; 221… Energy storage device; 222… Power converter; 30… Drive system; 31… Hydraulic drive module; 311… Inverter; 312… Electric motor; 313… Hydraulic pump; 314… Hydraulic actuator; 32… Rotary module; 321… Inverter; 322… Electric rotary motor; B… Busbar.

Claims

1. A type of operating machinery, comprising a working device, wherein, The operating machinery includes: A fuel cell system comprising multiple fuel cell modules supported on the body of the operating machinery and connected to a busbar; and Main control unit, Upon receiving a command signal to start the operating machinery, the main control device outputs a start command to the first fuel cell module among the plurality of fuel cell modules. Upon detecting the start-up of the first fuel cell module, a start-up command is output to a second fuel cell module, which is different from the first fuel cell module, among the plurality of fuel cell modules.

2. The operating machinery according to claim 1, wherein, The operating machinery includes auxiliary equipment corresponding to each of the plurality of fuel cell modules and used to operate the corresponding fuel cells. Upon receiving the command signal to start the operating machinery, the main control device outputs a command signal to drive the auxiliary equipment corresponding to the first fuel cell module. When the main control device detects the start-up of the first fuel cell module, it outputs a command signal to drive the auxiliary equipment corresponding to the second fuel cell module.

3. The operating machinery according to claim 1, wherein, The operating machinery includes: An energy storage device connected to the busbar; and A power converter is disposed between the energy storage device and the busbar. Upon receiving the command signal to start the operating machinery, the main control device will output a command signal to the power converter to supply power from the energy storage device to the bus.

4. The operating machinery according to claim 1, wherein, The operating machinery is equipped with a monitoring device that outputs data indicating the status of the first fuel cell module. The main control device detects the start-up of the first fuel cell module based on data output from the monitoring device. When the main control device detects the start-up of the first fuel cell module, it outputs the start-up command to the second fuel cell module.

5. The operating machinery according to claim 3, wherein, The energy storage device is a capacitor.

6. The operating machinery according to claim 3, wherein, The energy storage device is a storage battery.

7. The operating machinery according to claim 1, wherein, The main control device allows the operation of the working machinery after all the multiple fuel cell modules have been started.

8. A fuel cell system that generates electricity for driving machinery equipped with working devices, wherein, The fuel cell system comprises: Multiple fuel cell modules, supported on the body of the working machinery and connected to a busbar; and Main control unit, Upon receiving a command signal to start the operating machinery, the main control device outputs a start command to the first fuel cell module among the plurality of fuel cell modules. When the main control device detects the start-up of the first fuel cell module, it outputs a start-up command to a second fuel cell module that is different from the first fuel cell module among the plurality of fuel cell modules.

9. A method for controlling a fuel cell system, the fuel cell system comprising a plurality of fuel cell modules supported on a vehicle body and connected to a busbar, and generating electricity for driving working machinery equipped with working devices, wherein, The method for controlling the fuel cell system includes the following steps: Upon receiving a command signal to start the operating machinery, a start command is output to the first fuel cell module among the plurality of fuel cell modules; as well as Upon detecting the start-up of the first fuel cell module, a start-up command is output to a second fuel cell module, which is different from the first fuel cell module, among the plurality of fuel cell modules.

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