Work machine, fuel cell system, and method for controlling fuel cell system

Abstract

To suppress the variation in the degree of deterioration of a plurality of fuel cell modules in a work machine equipped with the plurality of fuel cell modules.SOLUTION: A main control device determines a control order for starting or stopping the multiple fuel cell modules. At a control point in time when the multiple fuel cell modules are to be started or stopped, the main control device starts or stops the multiple fuel cell modules in an order different from the control order at the previous control point in time.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a work machine, a fuel cell system, and a method for controlling the fuel cell system.

Background Art

[0002] In the technical field related to work machines, super-large trucks equipped with a fuel cell system including a plurality of fuel cell modules as disclosed in Patent Document 1 are known. A fuel cell generates electrical energy through a chemical reaction between hydrogen and oxygen. Hydrogen, which is the fuel, is supplied from a tank filled with hydrogen gas. Also, oxygen is supplied from the atmosphere. Therefore, auxiliary devices such as a fuel pump and an air compressor are provided for the fuel cell to operate the fuel cell.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Auxiliary devices for operating the fuel cell are driven by electric power. Therefore, the fuel cell system needs to include a power storage device for storing power at startup. By the way, a fuel cell may deteriorate according to the operating time. When the fuel cell system includes a plurality of fuel cell modules, the degree of deterioration of the plurality of fuel cells may vary depending on the operating time of each fuel cell module. For this reason, there is a desire to make the degree of deterioration of the plurality of fuel cells uniform.

[0005] An object of the present disclosure is to provide a work machine, a fuel cell system, and a method for controlling the fuel cell system that suppress variations in the degree of deterioration of a plurality of fuel cell modules in a work machine including the plurality of fuel cell modules.

Means for Solving the Problems

[0006] According to one aspect of the present invention, a work machine is a work machine including a working device, and includes a fuel cell system supported by the vehicle body of the work machine and including a plurality of fuel cell modules, and a main control device. The main control device starts or stops the plurality of fuel cell modules in an order different from the control order at the previous control time when controlling the start or stop of the plurality of fuel cell modules.

Effects of the Invention

[0007] According to the above aspect, the work machine can suppress variations in the degree of deterioration of the plurality of fuel cell modules.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0009] 〈First Embodiment〉 Configuration of Working Machine 1 FIG. 1 is a schematic diagram showing the configuration of a working machine 1 according to the first embodiment. The working machine 1 according to the first embodiment is, for example, a hydraulic excavator. The working machine 1 includes a traveling body 110, a revolving body 120, a working device 130, a cab 140, and a main control device 145. The working machine 1, which is a hydraulic excavator, excavates and levels earth and sand at a work site or the like. The traveling body 110 and the revolving body 120 constitute the vehicle body.

[0010] The traveling body 110 supports the working machine 1 so as to be capable of traveling. The traveling body 110 has a pair of left and right crawlers. The working machine 1 moves forward, turns, or moves backward by the rotation of the pair of crawlers. The revolving body 120 is supported by the traveling body 110 so as to be rotatable about the center of rotation. The revolving body 120 supports the working device 130, the cab 140, the machine room 150, and the fuel cell system 20.

[0011] The cab 140 is a place where the operator of the working machine 1 boards and performs operations and controls. The cab 140 is disposed, for example, on the left side portion of the front end of the revolving body 120. The main control device 145 is mounted in the cab 140 of the working machine 1.

[0012] The fuel cell system 20, which will be described later, is disposed in the machine room 150. The machine room 150 is disposed, for example, behind the cab 140. The machine room 150 forms a space for disposing the fuel cell system 20.

[0013] The working device 130 is supported by the vehicle body of the working machine 1 so as to be operable. The working device 130 includes a boom 131, an arm 132, and an attachment 133 which is a working tool. The attachment 133 is an example of a working tool. The attachment 133 in the example shown in FIG. 1 is a bucket. The base end portion of the boom 131 is rotatably attached to the front end portion of the revolving body 120. The base end portion of the arm 132 is rotatably attached to the tip end portion of the boom 131. The attachment 133 is rotatably attached to the tip end portion of the arm 132.

[0014] The working machine 1 includes a plurality of actuators for driving the working machine 130. The plurality of actuators include, for example, a boom cylinder 131C, an arm cylinder 132C, and an attachment cylinder 133C.

[0015] The boom cylinder 131C is a hydraulic cylinder for driving the boom 131. The base end portion of the boom cylinder 131C is attached to the revolving body 120. The tip end portion of the boom cylinder 131C is attached to the boom 131. The arm cylinder 132C is a hydraulic cylinder for driving the arm 132. The base end portion of the arm cylinder 132C is attached to the boom 131. The tip end portion of the arm cylinder 132C is attached to the arm 132. The attachment cylinder 133C is a hydraulic cylinder for driving the attachment 133. The base end portion of the attachment cylinder 133C is attached to the arm 132. The tip end portion of the attachment cylinder 133C is attached to the attachment 133.

[0016] 《Configuration of the driver's cab》 FIG. 2 is a schematic diagram showing the configuration of the driver's cab 140 of the working machine 1 according to the first embodiment.

[0017] As shown in FIG. 2, the driver's cab 140 is provided with a driver's seat 141, a left operation lever 142LO, a right operation 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. The left operation lever 142LO and the right operation lever 142RO are arranged on the left and right sides of the driver's seat 141 in the driver's cab 140. Also, the left foot pedal 142LF and the right foot pedal 142RF are arranged on the floor surface in front of the driver's seat 141 in the driver's cab 140.

[0018] The left operation lever 142LO, which is arranged on the left side facing the front of the driver's cab, is an operating device for performing the turning operation of the slewing body 120 and the excavation / dumping operation of the arm 132. The right operation lever 142RO, which is arranged on the right side facing the front of the driver's cab, is an operating device for performing the excavation / dumping operation of the attachment 133 and the raising / lowering operation of the boom 131.

[0019] In addition, the left travel lever 142LT and the right travel lever 142RT are operating devices for controlling the operation of the traveling body 110, that is, for controlling the travel of the work machine 1. The left travel lever 142LT, which is arranged on the left side facing the front of the driver's cab, corresponds to the rotational drive of the left crawler of the traveling body 110. The right travel lever 142RT, which is arranged on the right side facing the front of the driver's cab, corresponds to the rotational drive of the right crawler of the traveling body 110. Note that the left foot pedal 142LF and the right foot pedal 142RF are interlocked with the left travel lever 142LT and the right travel lever 142RT, respectively, and the travel can also be controlled by the left foot pedal 142LF and the right foot pedal 142RF.

[0020] FIG. 3 is a schematic block diagram showing the configuration of the fuel cell system 20 and the 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 electric power for driving the work machine 1. The fuel cell system 20 generates electric power for driving the drive system 30. The electric power generated by the fuel cell system 20 is output to the drive system 30 via the bus bar B. The drive system 30 drives the work implement 130 and the traveling body 110 with the electric power generated by the fuel cell system 20.

[0021] The fuel cell system 20 includes a plurality of fuel cell modules 21 and a power storage device module 22 connected in parallel to the bus bar B.

[0022] Each fuel cell module 21 includes a fuel cell 211, a power converter 212, a compensator 213, and a fuel cell control device 214. The fuel cell 211 generates electric power by electrochemically reacting hydrogen and oxygen. The power converter 212 is, for example, a DC-DC converter and is configured to be able to control the generated electric power of the fuel cell 211. The power converter 212 converts the electric power generated by the fuel cell 211 and supplies it to the bus B. The auxiliary device 213 is a device for operating the fuel cell 211. The fuel cell module 21 includes, as the auxiliary device 213, a hydrogen pump for supplying hydrogen gas to the fuel cell 211, an air compressor for generating compressed air to be supplied to the fuel cell 211, a water pump for supplying cooling water for cooling the fuel cell 211, and the like. The fuel cell control device 214 controls the fuel cell module 21 according to a command from the main control device 145. The fuel cell control device 214 monitors the state of the fuel cell 211 and outputs data indicating the state of the fuel cell 211 to the main control device 145. The fuel cell control device 214 is an example of a monitoring device.

[0023] The energy storage device module 22 includes an energy storage device 221 and a power converter 222. The energy storage device 221 is configured to be able to store or discharge surplus electric power of the bus B. The power converter 222 is, for example, a DC-DC converter and controls the input and output of the electric power of the energy storage device 221. The power converter 222 outputs electric power from the energy storage device 221 according to a command from the main control device 145. The energy storage device 221 is, for example, a capacitor.

[0024] The drive system 30 includes a hydraulic drive module 31 and a slewing module 32.

[0025] 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 the direct current from the bus B into a three-phase alternating current and supplies it to the electric motor 312. The electric motor 312 rotates by the supplied three-phase alternating current and drives the hydraulic pump 313. The hydraulic pump 313 discharges hydraulic oil for supplying the hydraulic actuator 314. The hydraulic 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 hydraulic oil. The hydraulic actuator 314 includes a boom cylinder 131C, an arm cylinder 132C, an attachment cylinder 133C, and a traveling motor 134. The rotational force generated by the traveling motor 134 is transmitted to the traveling body 110.

[0026] The slewing module 32 includes an inverter 321 and an electric slewing motor 322. The inverter 321 converts the direct current from the bus B into a three-phase alternating current and supplies it to the electric slewing motor 322. The electric slewing motor 322 rotates by the supplied three-phase alternating current and rotates the slewing body 120 with respect to the traveling body 110.

[0027] 《Control at Startup of the Working Machine 1》 FIG. 4 is a flowchart showing the control at startup of the working machine 1 according to the first embodiment. When the operator operates the start operation switch 143, the start operation switch 143 outputs a command signal for starting the working machine 1 to the main control device 145. The start operation switch 143 is, for example, a switch that outputs a command signal for starting the working machine 1 when pressed by the operator. When a command signal for starting the working machine 1 is input from the start operation switch 143 to the main control device 145 by the operation of the operator, the main control device 145 starts the fuel cell system 20 in the following procedure. First, the main control device 145 outputs a command signal to the power converter 222 of the power storage device module 22 so as to supply predetermined power to the bus B (step S1). The predetermined power may be power capable of driving the auxiliary device 213 of at least one fuel cell module 21 among the plurality of fuel cell modules 21.

[0028] Next, the main control device 145 reads out control sequence data indicating the previous control sequence of the fuel cell module 21 from the internal storage (step S2). In the internal storage, control sequence data in which an initial value control sequence is recorded is stored in the initial state. The main control device 145 rotates the control sequence indicated by the read control sequence data to update the control sequence data (step S3). For example, in the working machine 1 having four fuel cell modules A - D, when the control sequence (control sequence at the first control time) indicated by the control sequence data read in step S2 is A, B, C, D, the main control device 145 changes the next control sequence (control sequence at the second control time) to B, C, D, A and updates the control sequence data.

[0029] The main control device 145 determines a fuel cell module 21 to be started from among a plurality of fuel cell modules 21 according to the updated control sequence data (step S4). The main control device 145 outputs a start command to the fuel cell control device 214 of the fuel cell module 21 determined in step S4 (step S5). When the fuel cell control device 214 of the fuel cell module 21 to be started receives the start command, it drives the compensator 213 with the power of the bus B. When hydrogen and oxygen are supplied to the fuel cell 211 of the fuel cell module 21 to be started by driving the compensator 213, the fuel cell 211 reacts hydrogen and oxygen to generate water and power.

[0030] The main control device 145 detects the start of the fuel cell module 21 to be started (step S6). Specifically, the fuel cell control device 214 of the fuel cell module 21 to be started 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 completed. The data indicating the start completed state is an example of a notification indicating that the fuel cell 211 is operating. The main control device 145 receives the data output from the fuel cell control device 214 of the fuel cell module 21 to be started and detects the state of the fuel cell 211. The main control device 145 detects the start of the fuel cell 211 based on the data from the fuel cell control device 214 of the fuel cell module 21 to be started.

[0031] When the start of the fuel cell 211 of the fuel cell module 21 to be started is detected, the main control device 145 outputs a command signal to the fuel cell control device 214 of the fuel cell module 21 to be started so as to supply predetermined power to the bus B (step S7). The fuel cell control device 214 of the fuel cell module 21 to be started causes the power converter 212 to supply the power generated by the fuel cell 211 to the bus B based on the command signal from the main control device 145 (step S8).

[0032] Based on the control sequence data updated in step S3, the main control device 145 determines whether there is a fuel cell module 21 to be started next (step S9). If there is a fuel cell module 21 to be started next (step S9: YES), the main control device 145 returns the process to step S5 and determines the next fuel cell module 21 to be started as the startup target. If there is no fuel cell module 21 to be started next (step S9: NO), that is, when all the fuel cell modules 21 have been started, the main control device 145 ends the startup process.

[0033] When the startup of all the fuel cell modules 21 is completed, the main control device 145 permits the operation of the working machine 1 according to the operation of the operating device by the operator. The main control device 145 receives the operation of the operating device by the operator and outputs a control command to the inverter 311 of the hydraulic drive module 31 and the inverter 321 of the slewing module 32 according to the operation amount.

[0034] After that, when the operator operates the start operation switch 143 to end the operation of the working machine 1, the main control device 145 performs the stop process of each fuel cell module 21. The fuel cell control device 214 of each fuel cell module 21 continues to generate power in the fuel cell 211 until the remaining fuel in the fuel cell 211 runs out. The power converter 222 of the power storage device module 22 stores the power supplied from each fuel cell module 21 in the power storage device 221. At this time, similar to the startup, the main control device 145 may stop the plurality of fuel cell modules 21 one by one in order. When the main control device 145 stops the plurality of fuel cell modules 21 one by one in order, it stops the fuel cell modules 21 in the same order as the control sequence. Thereby, the variation in the operation time of the plurality of fuel cell modules 21 can be suppressed.

[0035] 《Function and Effect》 As described above, the main control device 145 according to the first embodiment functions as follows. The main control device 145 determines the control order of a plurality of fuel cells 211. At the start time when starting a plurality of fuel cells 211, the main control device 145 starts the plurality of fuel cells 211 in the determined control order. The main control device 145 determines the control order such that the control order at the first start time is different from the control order at the second start time. If the fuel cells 211 are always started in the same control order, a difference occurs in the cumulative load between the first-started fuel cell 211 and the last-started fuel cell 211, and as a result, the deterioration of the first-started fuel cell 211 progresses relatively quickly. In contrast, according to the first embodiment, by varying the control order, the progress of the deterioration of the fuel cells can be leveled.

[0036] Note that the main control device 145 according to the first embodiment changes the control order for each start time of the fuel cell module 21, but is not limited thereto. For example, the main control device 145 according to other embodiments may change the control order every certain number of startups.

[0037] <Second Embodiment> The main control device 145 according to the first embodiment makes the control order different each time by rotating the control order. On the other hand, since the load applied to the working machine 1 is different for each use, even if the control order is rotated, the degree of deterioration for each fuel cell module 21 may not become uniform. The main control device 145 according to the second embodiment calculates the degree of deterioration of the fuel cell module 21 and determines the control order of the fuel cell module 21 according to the degree of deterioration.

[0038] <Control at Startup of Working Machine 1> FIG. 5 is a flowchart showing the control at startup of the working machine 1 according to the second embodiment. The main control device 145 according to the second embodiment executes the following steps S21 and S22 instead of steps S2 and S3 of the first embodiment. When the voltage of the bus bar B becomes equal to or higher than a predetermined voltage value by the control of the power converter 222 of the power storage device module 22, the main control device 145 acquires data indicating the degree of deterioration of each fuel cell 211 from the fuel cell control device 214 of each fuel cell module 21 (step S21). The fuel cell control device 214 has a function of calculating the degree of deterioration of the corresponding fuel cell 211 from the time series of the current value and voltage value output by the fuel cell 211 and other operation information.

[0039] Based on the data indicating the degree of deterioration acquired from each fuel cell module 21, the main control device 145 determines the control order of the plurality of fuel cell modules 21 (step S22). The main control device 145 determines the control order so that the activation of the fuel cell 211 with the highest degree of deterioration among the plurality of fuel cells 211 is the last. For example, in the working machine 1 having four fuel cell modules A - D, when the degree of deterioration of fuel cell A is 1.0%, the degree of deterioration of fuel cell B is 0.5%, the degree of deterioration of fuel cell C is 1.5%, and the degree of deterioration of fuel cell D is 0.2%, the main control device 145 determines the next control order (activation order) as D, B, A, C. The main control device 145 may determine the control order (activation order) in ascending order of the degree of deterioration.

[0040] Further, the main control device 145 may stop the plurality of fuel cell modules 21 one by one in order. Even when the main control device 145 stops the plurality of fuel cell modules 21 one by one in order, it determines the control order for stopping the fuel cell modules 21 based on the degree of deterioration of the fuel cells 211. The main control device 145 determines the activation order so that the stop of the fuel cell 211 with the highest degree of deterioration among the plurality of fuel cells 211 is the first. For example, in the working machine 1 having four fuel cell modules A - D, when the degree of deterioration of fuel cell A is 1.0%, the degree of deterioration of fuel cell B is 0.5%, the degree of deterioration of fuel cell C is 1.5%, and the degree of deterioration of fuel cell D is 0.2%, the main control device 145 determines the next control order (stop order) as C, A, B, D. The main control device 145 may determine the control order (stop order) in descending order of the degree of deterioration.

[0041] As described above, the main control device 145 according to the second embodiment identifies the degree of deterioration of each of the plurality of fuel cells 211, and determines the control order so that the start-up of the fuel cell 211 with the highest degree of deterioration among the plurality of fuel cells 211 is the last, or the stop is the first. Thereby, the operation time of the fuel cell 211 with a high degree of deterioration can be shortened, and further progress of deterioration can be prevented.

[0042] FIG. 6 is a schematic block diagram showing the configuration of the computer according to the first embodiment. The computer 90 includes a processor 91, a main memory 92, a storage 93, and an interface 94. The above-described main control device 145 and fuel cell control device 214 are implemented in the computer 90. The operations of the above-described respective processing units are stored in the storage 93 in the form of a program. The processor 91 reads the program from the storage 93 and expands it in the main memory 92, and executes the above processing according to the program. Further, the processor 91 secures a storage area corresponding to each of the above-described storage units in the main memory 92 according to the program. Examples of the processor 91 include a CPU (Central Processing Unit), a GPU (Graphic Processing Unit), and a microprocessor.

[0043] The program may be for realizing a part of the functions to be exerted on the computer 90. For example, the program may exert functions in combination with other programs already stored in the storage or in combination with other programs implemented in other devices. In other embodiments, the computer 90 may include, in addition to or instead of the above configuration, a custom LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device). 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, some or all of the functions realized by the processor 91 may be realized by the integrated circuit. Such an integrated circuit is also included as an example of a processor. In other embodiments, the computer 90 may be virtualized on one or more computers.

[0044] Examples of the storage 93 include a magnetic disk, a magneto-optical disk, an optical disk, a semiconductor memory, etc. The storage 93 may be an internal medium directly connected to the bus of the computer 90, or may be an external medium connected to the computer 90 via the interface 94 or a communication line. Also, when this program is distributed to the computer 90 via a communication line, the computer 90 that has received the distribution may expand the program in the main memory 92 and execute the above processing. In at least one embodiment, the storage 93 is a non-transitory tangible storage medium.

[0045] Also, the program may be for implementing a part of the functions described above. Furthermore, the program may be what realizes the functions described above in combination with other programs already stored in the storage 93, namely, a so-called differential file (differential program).

[0046] <Other Embodiments> As described above, one embodiment has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like are possible. For example, the main control device 145 according to the above-described embodiment may be configured by a single computer, or the configuration of the main control device 145 may be divided and arranged among a plurality of computers, and the plurality of computers may function as the main control device 145 by cooperating with each other. At this time, some of the computers constituting the main control device 145 may be mounted inside the working machine 1, and other computers may be provided outside the working machine 1. Also, the main control device 145 according to the above-described embodiment may have the function of the fuel cell control device 214. In this case, each fuel cell module 21 does not necessarily have to include the fuel cell control device 214, and the power converters 212 and auxiliary devices 213 of each fuel cell module 21 may operate based on a command signal from the main control device 145. Also, the main control device 145 may have a function of monitoring the state of the fuel cell 211 as a monitoring device.

[0047] Also, the working machine 1 according to the above-described embodiment is a hydraulic excavator, but is not limited thereto. For example, the working machine 1 according to other embodiments may be other working machines such as a wheel loader or a dump truck.

[0048] Also, in the above-described embodiment, a capacitor is given as an example of the power storage device 221, but is not limited thereto. For example, the power storage device 221 of the working machine 1 according to other embodiments may be a battery.

[0049] Further, the main control device 145 according to another embodiment may randomly determine the control order of the plurality of fuel cell modules 21. Further, the main control device 145 according to another embodiment may determine the control order so as to rotate the fuel cell module 21 to be started first and the fuel cell module 21 to be started last. For example, in the work machine 1 having four fuel cell modules A - D, if the previous control order is A, B, C, D, the next control order may be determined as D, B, C, A. Further, the main control device 145 according to another embodiment may randomly determine the control order when the start or stop of the plurality of fuel cell modules 21 exceeds a predetermined number of times. For example, in the work machine 1 having four fuel cell modules A - D, when the fuel cell modules are started a predetermined number of times in the control order of A, B, C, D, the next control order may be determined as B, C, D, A. In any case, the control orders (start order or stop order) at two different consecutive control times (start time or stop time) will be different from each other.

[0050] Further, in the above-described embodiment, the start operation switch 143 for starting the work machine 1 is a switch that outputs a start signal when pressed by the operator, but is not limited thereto. The start operation switch 143 may be, for example, a key switch having a key cylinder into which a key is inserted, and the key is inserted into the key cylinder and rotated from the off position via the key - on position to the start position. Further, the start operation switch 143 may be, for example, a portable operation device held by the operator. When the operator operates the portable operation device, wireless communication is performed between the portable operation device and the main control device 145, and the work machine 1 may be started on the condition that the communication is established. The portable operation 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 a portable information terminal. Further, the start operation switch 143 may be arranged, for example, at a remote location and configured to start the work machine 1 by remote operation.

[0051] The main control device 145 according to another embodiment may start a plurality of fuel cell modules 21 in accordance with the control order at the start-up time and stop the plurality of fuel cell modules simultaneously at the stop time. Further, the main control device 145 according to another embodiment may start a plurality of fuel cell modules 21 simultaneously at the start-up time and stop the plurality of fuel cell modules in accordance with the control order at the stop time.

Explanation of Signs

[0052] 1... Working machine 110... Traveling body 120... Slewing body 130... Working implement 131... Boom 131C... Boom cylinder 132... Arm 132C... Arm cylinder 133... Attachment 133C... Attachment cylinder 134... Traveling motor 140... Cab 141... Driver's seat 142LF... Left foot pedal 142LO... Left operation lever 142LT... Left traveling lever 142RF... Right foot pedal 142RO... Right operation lever 142RT... Right traveling lever 145... Main control device 20... Fuel cell system 21... Fuel cell module 211... Fuel cell 212... Power converter 213... Compensator 214... Fuel cell control device 22... Energy storage device 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... Slewing module 321... Inverter 322... Electric slewing motor B... Bus bar

Claims

1. A working machine comprising a working implement, a fuel cell system supported by the vehicle body of the working machine and including a plurality of fuel cell modules, and a main control device wherein the main control device when controlling to start or stop the plurality of fuel cell modules, starts or stops the plurality of fuel cell modules in an order different from the control order at the previous control time point working machine.

2. The main control device starts or stops the plurality of fuel cell modules in an order different from the control order at the previous control time point based on the state of each of the plurality of fuel cell modules The working machine according to claim 1.

3. The main control device identifies the degree of deterioration of each of the plurality of fuel cell modules, and starts or stops the plurality of fuel cell modules in an order different from the control order at the previous control time point such that the start of the fuel cell with the highest degree of deterioration among the plurality of fuel cell modules is the last or the stop is the first The working machine according to claim 1.

4. A working machine comprising a working implement, a fuel cell system supported by the vehicle body of the working machine and including a plurality of fuel cell modules, and a main control device, wherein the main control device at the start or end of operation of the working machine, at the next start or stop, starts or stops a fuel cell module different from the fuel cell module that was started or stopped first among the plurality of fuel cell modules working machine.

5. A fuel cell system that generates electric power for driving a working machine including a working implement, a plurality of fuel cell modules supported by the vehicle body of the working machine, and a main control device, wherein the main control device when controlling to start or stop the plurality of fuel cell modules, starts or stops the plurality of fuel cell modules in an order different from the control order at the previous control time point fuel cell system.

6. A method for controlling a fuel cell system including a plurality of fuel cell modules that generate electric power for driving a working machine including a working implement, the method including a step of starting or stopping the plurality of fuel cell modules in an order different from the control order at the previous control time point when controlling to start or stop the plurality of fuel cell modules method.

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