Power System

Abstract

The problem to be solved by the present invention is to provide an electric power system that can shorten the time it takes to complete the startup of a device compared to the past. In order to solve the above problem, the electric power system of the embodiment includes a plurality of fuel cells and a control unit. The fuel cell generates electricity by an electrochemical reaction. The control unit determines that it is possible to supply power to the aforementioned device when the total value of the power that can be output by the plurality of the aforementioned fuel cells reaches or exceeds the value of the power requested by the device. In addition, the control unit can also use the temperature of the aforementioned fuel cell to calculate the predicted time it takes to supply power to the aforementioned device.

Description

Technical Field

[0001] The present invention relates to an electric power system. Background Art

[0002] There is a device that has multiple fuel cells and operates using these fuel cells. This device waits for all fuel cells to complete startup before starting. This is because if the device is started when only some fuel cells have completed startup, the fuel cells may not be able to operate normally due to insufficient output. However, the time it takes for fuel cells to complete startup from a stopped state sometimes varies. Therefore, this device must wait until the fuel cell that takes the longest to start has completed startup before starting, which takes time to complete.

[0003] [Prior Art Literature]

[0004] (Patent Document)

[0005] Patent Document 1: Japanese Patent Application No. 2011-503812 Summary of the Invention

[0006] [Problems to be solved by the invention]

[0007] An object of the embodiments of the present invention is to provide an electric power system that can shorten the time required to complete device startup compared to conventional systems.

[0008] [Technical means to solve the problem]

[0009] An electric power system according to an embodiment includes multiple fuel cells and a control unit. The fuel cells generate electricity through electrochemical reactions. The control unit determines that power can be supplied to the device when the total power output by the multiple fuel cells exceeds the power requested by the device.

[0010] (Effects of the Invention)

[0011] Compared with the past, the present invention can shorten the time taken to complete the startup of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a block diagram illustrating an example of the structure of the main parts of the vehicle according to the first embodiment.

[0013] Figure 2 It is a drawing Figure 1 A flowchart of an example of the processing of the first embodiment performed by the control unit in .

[0014] Figure 3This is a graph showing an example of temporal changes in the output value and the total output value of each fuel cell system (FCS) according to the first embodiment.

[0015] Figure 4 It is a drawing Figure 1 A flowchart of an example of processing according to the second embodiment performed by the control unit in .

[0016] Figure 5 This is a graph showing an example of temporal changes in the output value of each FCS and the total output value according to the second embodiment. DETAILED DESCRIPTION

[0017] Several vehicle embodiments are described below using the accompanying drawings. The scales of various parts of the drawings used in the following descriptions of the embodiments may be appropriately altered. Furthermore, for ease of explanation, the drawings used in the following descriptions of the embodiments may sometimes omit components. Throughout the drawings and this specification, the same reference numerals represent the same components.

[0018] [First embodiment]

[0019] Figure 1 This is a block diagram illustrating an example of the structure of the main parts of the vehicle 100 according to the first embodiment.

[0020] Vehicle 100 is a vehicle, such as a fuel cell vehicle (FCV), that uses a fuel cell as a propulsion source (for travel). As an example, vehicle 100 includes a control unit 101, a fuel cell system (FCS) 102, a fuel cell voltage control unit (FCVCU) 103, a battery 104, a battery voltage control unit (BATVCU) 105, a power drive unit (PDU) 106, a motor 107, and a transmission (T / M) 108. Vehicle 100 is an example of an electric power system. Furthermore, vehicle 100 is an example of a device supplied with electric power by FCS 102.

[0021] The control unit 101 is, for example, a computer that performs processing such as calculations and control required for the operation of the vehicle 100. Based on programs such as firmware, system software, and application software stored in a main storage device or auxiliary storage device, the control unit 101 controls various components to implement the various functions of the vehicle 100. Furthermore, the control unit 101 executes the processing described below based on these programs. Furthermore, some or all of these programs may be incorporated into the circuitry of the control unit 101.

[0022] Vehicle 100 includes multiple FCSs 102. FCSs 102 include, for example, a fuel cell stack and various devices used to operate the fuel cell stack. A fuel cell stack is composed of multiple stacked fuel cells. The fuel cell stack generates and outputs electricity through, for example, an electrochemical reaction between fuel gas and oxidant gas. FCSs 102 output the electricity output by the fuel cell stack. This electricity is supplied to various components of vehicle 100, such as charging and driving batteries 104, to operate various components of vehicle 100. Furthermore, FCSs 101 also output the current output power value.

[0023] The FCS 102 includes, for example, auxiliary equipment and a temperature sensor as devices for operating the fuel cell stack. The auxiliary equipment supplies fuel gas and oxidant gas to the fuel cell stack. The temperature sensor measures the temperature of the FCS 102 or the fuel cell stack and outputs a signal indicating the measurement result.

[0024] The FCVCU 103 is, for example, a boost converter that adjusts the voltage of the electric power outputted from the FCS 102 by boosting the voltage and outputs the electric power to the BATVCU 105 . The vehicle 100 includes, for example, one FCVCU 103 for one FCS 102 .

[0025] Vehicle 100 includes one or more batteries 104 . Battery 104 is a secondary battery that outputs electric power, which is supplied to various components of vehicle 100 .

[0026] The BATVCU 105 is a step-up / step-down converter that adjusts the voltage of the power output by the battery 104 and the FCVCU 103 by stepping up or down, and outputs the power to the PDU 106. Furthermore, the BATVCU 105 adjusts the power output by the FCVCU 103 to a voltage suitable for charging the battery 104, and then outputs the power to the battery 104.

[0027] The PDU 106 is an inverter or the like that converts input electric power into a frequency and voltage suitable for the rotation speed and torque of the motor 107 and outputs the converted electric power to the motor 107 .

[0028] The motor 107 is, for example, an electric motor that operates using input power and converts the power into driving force (rotational force) and outputs the resulting power. The motor 107 drives various components of the vehicle 100. The motor 107 is operated by, for example, power output from the FCS 102 and power output from the battery 104.

[0029] The T / M 108 is, for example, a transmission that adjusts the torque of the rotational force output by the motor 107 and transmits the result to wheels and the like.

[0030] The display unit 109 displays a screen for notifying various information to the operator (driver) of the vehicle 100 or other persons riding in the vehicle 100. The display unit 109 is, for example, a liquid crystal display or an organic electroluminescence (EL) display.

[0031] The following is based on Figure 2 The operation of the vehicle 100 according to the first embodiment will be described below. The contents of the processing in the following operation description are merely examples, and various processing that can achieve the same result can be used as appropriate. Figure 2 This is a flowchart showing an example of processing performed by the control unit 101 of the vehicle 100. The control unit 101 executes, for example, based on a program stored in a main storage device or an auxiliary storage device. Figure 2 processing.

[0032] In addition, Figure 2 In the description, it is assumed that the vehicle 100 includes N FCSs 102 , namely, FCSs 102 - 1 to 102 -N.

[0033] For example, the control unit 101 starts when the vehicle 100 is started. Figure 2 The process shown. Note that the so-called starting of the vehicle 100 is, for example, to put the vehicle 100 in a state where it can start.

[0034] In step ST11, the control unit 101 issues a startup request to each of the FCSs 102-1 to 102-N. Based on this request, each FCS 102 starts an operation for startup.

[0035] In step ST12, the control unit 101 obtains the warm-up time for each FCS 101. The warm-up time is the estimated time required for the FCS 101 to start up. For example, the control unit 101 obtains the temperature of each FCS 101. Then, the control unit 101 calculates the warm-up time based on the temperature. In this way, the control unit 101 obtains the warm-up time. Furthermore, the control unit 101 may obtain the degree of degradation for each FCS 101 in addition to the temperature. Then, the control unit 101 calculates the warm-up time based on the temperature or both.

[0036] Furthermore, even if there are FCSs 102 that have not yet completed their activation requests, while there are also FCSs 102 that have completed their activation requests, the control unit 101 may sequentially acquire warm-up times starting with the FCSs 102 that have completed their activation requests. Furthermore, the control unit 101 may process steps ST11 and ST12 in parallel or in parallel for each FCS 102 by performing steps ST11 and ST12 in a different thread or process for each FCS 102.

[0037] In step ST13, the control unit 101 obtains the time required to start the vehicle 100. For example, the control unit 101 calculates the predicted time required to start the vehicle 100 based on the warm-up time obtained in step ST12 and the output increase rate of each FCS 102 after startup. This predicted time is, for example, the time until the total power output of the FCS 102 reaches or exceeds the target output TH1. Furthermore, this predicted time indicates the time until power can be supplied from the FCS 102 to the vehicle 100. By calculating this time, the control unit 101 obtains the time required to start the vehicle 100.

[0038] In step ST14, the control unit 101 notifies the people in the vehicle 100 and the like of the time taken from the start of warming up to the start of the vehicle 100. For example, the control unit 101 displays an image on the display unit 109 indicating the time taken to start the vehicle 100 obtained in step ST13. In addition, the control unit 101 may also display the time obtained by adding a margin to the time obtained in step ST13 as the time taken to start the vehicle 100. In addition, the control unit 101 may also make the notification by outputting a voice indicating the time taken to start the vehicle 100 from a speaker instead of the display unit 109 or in addition to the display unit 109. In addition, the control unit 101 may also make the notification using other methods. The display unit 109 and the speaker are examples of the notification unit. In addition, a device that makes the notification using other methods is also an example of the notification unit.

[0039] In step ST15, the control unit 101 starts warming up each FCS 102 by controlling each unit required for warming up the FCS 102. When the FCS 102 reaches a temperature at which it can be started, it starts up.

[0040] In step ST16, the control unit 101 obtains the power value that can be output from each FCS 102. The power value obtained here is, for example, the power value that can be output by the FCS 102 at the beginning of the vehicle 100, after the vehicle 100 startup process begins, or after the startup process is completed. The higher the temperature of the FCS 102, the greater the power value. Note that the power value that can be output by the FCS 102 before startup is zero.

[0041] In step ST17, the control unit 101 obtains the total value (hereinafter referred to as "output total value") of the outputs of the N FCSs 102. The control unit 101 obtains the output total value by, for example, adding the maximum value obtained in step ST16 to the N-unit value.

[0042] In step ST18, the control unit 101 determines whether the total output value obtained in step ST17 is greater than or equal to the target output TH1. Target output TH1 is a threshold used to determine whether the vehicle 100 can be started. A total output value greater than or equal to target output TH1 indicates that each FCS 102 can supply the required power to the vehicle 100 after startup. Target output TH1 is, for example, the power required by the vehicle 100. Target output TH1 represents the power required to operate the vehicle 100. The control unit 101 calculates target output TH1 based on, for example, the power required to operate each component of the vehicle 100. Alternatively, target output TH1 may be predetermined by the designer of the vehicle 100 and stored in a storage device of the control unit 101. If the total output value is less than target output TH1, the control unit 101 returns a NO determination in step ST18 and returns to step ST16.

[0043] In this manner, the control unit 101 repeats steps ST16 to ST18 until the total output value reaches or exceeds the target output.

[0044] If the output total value is equal to or greater than the target output TH1, the control unit 101 makes a YES determination in step ST18 and proceeds to step ST19.

[0045] In step ST19, the control unit 101 starts the vehicle 100. By starting the vehicle 100, the vehicle 100 becomes capable of traveling. As the start of the vehicle 100, for example, the control unit 101 controls the T / M 108 to form a state in which the rotational force output by the motor 107 can be transmitted to the wheels. Before the vehicle 100 starts, the T / M 108 does not transmit this rotational force to the wheels. For example, the T / M 108 makes the rotational force not transmitted to the wheels by putting the clutch in a disengaged state. In addition, as the start of the vehicle 100, for example, the control unit 101 releases the lock of the gear position so that the gear position can be changed to a gear position other than a specific gear position. Before the vehicle 100 starts, the gear position is locked in a specific gear position such as P (parking gear). In addition, as the start of the vehicle 100, for example, the control unit 101 forms a state in which the electric power output by the FCS 102 can be transmitted to each part of the vehicle 100 such as the motor 107. Before the vehicle 100 starts, the electric power output by the FCS 102 is not transmitted to each part of the vehicle 100 such as the motor 107 through a switch or the like. After the processing of step ST19, the control unit 101 ends Figure 2 the processing shown.

[0046] Here, Figure 3 the output value, total output value, and target output TH1 of each FCS 102 will be described. Figure 3 is a graph showing an example of the time change of the output value and total output value of each FCS 102 of the first embodiment. In addition, in Figure 3 , the number of FCS 102s possessed by the vehicle 100 is represented by four, namely FCS 102-1 to FCS-102-4. In addition, the waveform W1 represents an example of the waveform of the output value of the FCS 102-1, the waveform W2 represents an example of the waveform of the output value of the FCS 102-2, the waveform W3 represents an example of the waveform of the output value of the FCS 102-3, and the waveform W4 represents an example of the waveform of the output value of the FCS 102-4. In addition, the waveform W0 represents an example of the waveform of the total output value. The FCS 102-1 starts at time t1, the FCS 102-1 starts at time t2, the FCS 102-1 starts at time t3, and the FCS 102-1 starts at time t4. In addition, as an example, the magnitude relationship of t1 to t4 is set to t1 < t2 < t3 < t4. In addition, in Figure 3 , the time when the total output value reaches the target output TH1 or more is represented as time t0. The control unit 101 determines that it is by performing the processing of step ST18 after time t0. Therefore, the control unit 101 starts the vehicle 100 after time t0. In Figure 3Among them, as an example, the magnitude relationship of time t0 to time T4 is set as t1 < t2 < t3 < t0 < t4. That is, at the time point of time t0, FCS 102-1 to FCS 102-3 have been started, and FCS 102-4 has not been started yet. This indicates that the control unit 101 starts the start of the vehicle 100 before all FCS 102 are started.

[0047] The vehicle 100 of the first embodiment starts the start of the vehicle 100 in response to the total value of the power that can be currently output by the plurality of aforementioned fuel cells reaching the target output TH1. Therefore, the vehicle 100 of the first embodiment can start the start of the vehicle 100 before all FCS 102 are started, so the time taken until the start of the vehicle 100 is completed can be shortened compared with the prior art.

[0048] In addition, the vehicle 100 of the first embodiment notifies the time taken for the vehicle 100 to start. Thereby, the person riding in the vehicle 100 or the like can know the time taken for the vehicle 100 to start.

[0049] In addition, the vehicle 100 of the first embodiment obtains the start time of each FCS 102, obtains the output voltage after start based on the start time of each FCS 102, and obtains the time taken for the vehicle 100 to start based on the output voltage. By doing so, the vehicle 100 of the first embodiment can obtain the time taken for the vehicle 100 to start.

[0050] 〔Second Embodiment〕

[0051] The configuration of the vehicle 100 of the second embodiment is the same as that of the first embodiment, so the description thereof is omitted.

[0052] Hereinafter, based on Figure 4 etc., the operation of the vehicle 100 of the second embodiment will be described. In addition, the content of the processing in the following operation description is an example, and various processes that can obtain the same result can be appropriately used. Figure 4 is a flowchart showing an example of the processing performed by the control unit 101 of the vehicle 100. The control unit 101 executes Figure 4 the processing based on a program stored in, for example, a main storage device or an auxiliary storage device.

[0053] In addition, in the Figure 4 description, it is assumed that the vehicle 100 has N FCS 102 of FCS 102-1 to FCS 102-N for the description.

[0054] In the second embodiment, after the processing of step ST12 in Figure 4 , the control unit 101 proceeds to step ST21.

[0055] In step ST21, the control unit 101 obtains the optimal warm-up method that minimizes the time (hereinafter referred to as "target arrival time") until the total output value reaches or exceeds the target output TH1. The control unit 101 obtains the optimal warm-up method by determining which FCS 102 to warm up first can minimize the target arrival time. In the vehicle 100, generally, when warming up a part of the FCS 102 preferentially, the start-up time of the preferentially warmed-up FCS 102 becomes shorter, and the start-up time of the non-preferentially warmed-up FCS 102 becomes longer.

[0056] For example, the control unit 101 can sometimes shorten the target arrival time by preferentially warming up M1 FCS 102 starting from those with shorter time to start among the N FCS 102, which can accelerate the time to start for the preferentially warmed-up FCS 1️⃣ For example, if the magnitude relationship of the start-up times t1 to t4 of four FCS 101 (FCS 101-1 to FCS 101-4) is t1 < t2 < t3 < t4, the control unit can sometimes shorten the target arrival time by preferentially warming up FCS 101-1 to FCS 101-3 with assumed shorter start-up times. In addition, M1 is an integer greater than or equal to 1 and less than N. Further, the control unit 101 obtains the value that makes the total output value of M1 FCS 102 reach or exceed the target output TH1 as the value of M1. M1 is an example of the necessary number of FCS 102 required to make the total output value reach or exceed the target output TH1.

[0057] For example, the control unit 101 can sometimes shorten the target arrival time by preferentially warming up M2 FCS 102 starting from those with higher outputs after start-up among the N FCS 102, which can accelerate the time to start for the preferentially warmed-up FCS 102. For example, for four FCS 101 (FCS 101-1 to FCS 101-4), if the maximum output of FCS 101-1 is P1, the maximum output of FCS 101-2 is P2, the maximum output of FCS 101-3 is P3, and the maximum output of FCS 101-4 is P4, and the magnitude relationship of the maximum outputs P1 to P4 is P1 < P2 < P3 < P4, the control unit can sometimes shorten the target arrival time by preferentially warming up FCS 101-2 to FCS 101-4 with relatively larger maximum outputs. In addition, M2 is an integer greater than or equal to 1 and less than N. Further, the control unit 101 obtains the value that makes the total output value of M2 FCS 102 reach or exceed the target output TH1 as the value of M2. M2 is an example of the necessary number of FCS 102 required to make the total output value reach or exceed the target output TH1.

[0058] Furthermore, by prioritizing the M3 FCSs 102 with the longest startup time among the N FCSs 102, the control unit 101 can sometimes shorten the startup time of the FCSs 102 prioritized for warming up, thereby shortening the target arrival time. Note that M2 is an integer greater than 1 and less than N.

[0059] Alternatively, the control unit 101 may prioritize the FCS 102 to be warmed up based on the temperature. For example, when the temperature is less than a predetermined threshold value TH2, the control unit 101 prioritizes warming up the N FCSs 102, starting with the one with the shortest startup time. Then, when the temperature is above the predetermined threshold value TH2, the control unit 101 prioritizes warming up the N FCSs 102, starting with the one with the highest post-startup output. The temperature may be the outside temperature outside the vehicle 100, the temperature inside the vehicle 100, or the temperature surrounding the FCS 102. By changing the priority FCS 102 to be warmed up based on the temperature, the control unit 101 may be able to shorten the target arrival time compared to a case where the priority FCS 102 to be warmed up is determined regardless of the temperature. Furthermore, the control unit 101 obtains the temperature from a temperature sensor or the like.

[0060] Prioritizing the FCS 102 that minimizes the target arrival time is not limited to the above-listed cases. The control unit 101 determines the optimal warm-up method based on, for example, the target output TH1, the time required to start each FCS 102, the maximum output of each FCS 102, the output of each FCS 102 immediately after startup, and the rate of increase in output of each FCS 102 after startup. However, the optimal warm-up method determined by the control unit 101 may not actually be the method that minimizes the target arrival time. Depending on the algorithm used to determine this method, the method may be longer than the method that actually minimizes the target arrival time. Therefore, the method determined by the control unit 101 to minimize the target arrival time can be any method that minimizes the target arrival time among the methods determined using the algorithm.

[0061] Alternatively, the control unit 101 may determine and store an optimal warm-up method in advance, and acquire the stored warm-up method in step ST21 .

[0062] In step ST22, the control unit 101 notifies the passengers of the vehicle 100, etc., of the time taken from the start of the warm-up to the start of the vehicle 100. For example, the control unit 101 displays an image on the display unit 109 indicating the time taken to start the vehicle 100, which was calculated in step ST21. Furthermore, the control unit 101 may add a margin to the time calculated in step ST21 and display the time taken to start the vehicle 100 as the time taken to start the vehicle 100. Furthermore, the control unit 101 may also notify the passengers by outputting a voice message indicating the time taken to start the vehicle 100 from a speaker, instead of or in addition to the display unit 109. Furthermore, the control unit 101 may also notify the passengers using other methods.

[0063] In step ST23, the control unit 101 starts warming up the FCS 102 by prioritizing the warming up of a portion of the FCS 102 based on the method determined in step ST21. Examples of methods for prioritizing warming up include increasing the load applied to the FCS 102. After processing step ST23, the control unit 101 proceeds to step ST16.

[0064] use Figure 5 The output value and the total output value of each FCS 102 in the second embodiment will be described. Figure 5 1 is a graph showing an example of temporal changes in the output values and the total output value of each FCS 102 according to the second embodiment. Figure 5 In FIG, the number of FCSs 102 included in the vehicle 100 is represented as four, namely, FCSs 102-1 to FCS-102-4. Figure 5 Waveforms W0b through W4b are shown as a graph for the case where FCSs 102-1 through 102-3 are prioritized for warming up. Waveform W1b shows an example waveform of the output value of FCS 102-1, waveform W2b shows an example waveform of the output value of FCS 102-2, waveform W3b shows an example waveform of the output value of FCS 102-3, and waveform W4b shows an example waveform of the output value of FCS 102-4. Furthermore, waveform W0b shows an example waveform of the total output value. FCS 102-1 is activated at time t1b, FCS 102-1 is activated at time t2b, FCS 102-1 is activated at time t3b, and FCS 102-1 is activated at time t4b. Time t0b is when the total output value reaches or exceeds target output TH1. Control unit 101 determines a positive result by performing step ST18 after time t0b. Therefore, the control unit 101 starts the vehicle 100 after time t0b. Figure 5Waveforms W1 to W4 of the first embodiment are also shown. As an example, the size relationships of t0b to t4b and t0 to t4 are t1b < t2b < t3b < t0b < t4b, t1b < t1, t2b < t2, t3b < t3, t4 < t4b, and t0b < t0. Thus, it can be seen that the vehicle 100 of the second embodiment starts earlier than that of the first embodiment.

[0065] In addition, the vehicle 100 of the second embodiment can also achieve the same effects as the vehicle 100 of the first embodiment.

[0066] The above embodiments can also be modified as follows.

[0067] In the above embodiments, a vehicle is taken as an example for illustration. However, the power system of the embodiments can also be applied to fuel cell-powered vehicles or drones other than vehicles. For example, the power system of the embodiments can be applied to aircraft, ships, submarines, or railway vehicles powered by fuel cells.

[0068] In addition, the power system of the embodiments can also be applied to stationary systems such as power generation facilities or cogeneration systems, or machinery other than vehicles and drones such as robots.

[0069] The control unit 101 can also implement part or all of the processes implemented by the program in the above embodiments through the hardware structure of the circuit.

[0070] The program for implementing the processes of the embodiments is transferred, for example, in a state stored in the device. However, the device can also be transferred without storing the program. Then, the program can be transferred separately and written into the device. The transfer of the program at this time can be achieved, for example, by recording it on a removable storage medium or downloading it via a network such as the Internet or a local area network (LAN).

[0071] The above describes the embodiments of the present invention, but they are shown as examples and do not limit the scope of the present invention. The embodiments of the present invention can be implemented in various forms without departing from the gist of the present invention.

[0072] Reference Numerals

[0073] 100: Vehicle

[0074] 101: Control Unit

[0075] 102: Fuel Cell System (FCS)

[0076] 103: Fuel Cell Voltage Control Unit (FCVCU)

[0077] 104: Battery

[0078] 105: Battery voltage control unit (BATVCU)

[0079] 106: Power Drive Unit (PDU)

[0080] 107: Motor

[0081] 108: Transmission (T / M)

[0082] 109: Display unit

Claims

1. A power system comprising: Multiple fuel cells generate electricity through electrochemical reactions; and, the control unit determines that power can be supplied to the device when the total value of power that can be output by the plurality of fuel cells reaches or exceeds the value of power requested by the device, and starts supplying power from the fuel cells to the device when it is determined that power can be supplied to the device. The control unit calculates the necessary number of the fuel cells required to achieve the power value requested by the device, and controls to preferentially warm up the necessary number of fuel cells among the plurality of fuel cells, and determines the fuel cells to be preferentially warmed up based on the temperature.

2. The power system according to claim 1, wherein: The control unit uses the temperature of the fuel cell to determine a predicted time required until power can be supplied to the device. The electric power system further includes a notification unit configured to notify the predicted time.

3. The power system according to claim 2, wherein: The startup time taken for the fuel cell to start is calculated based on the temperature of the fuel cell, the output voltage of the fuel cell after startup is calculated using the startup time, and the predicted time is calculated using the output voltage.

4. The power system according to claim 1, wherein: The necessary number of fuel cells are warmed up preferentially in descending order of output after startup.

5. The power system according to claim 1, wherein: The control unit determines the fuel cell to be warmed up preferentially based on the air temperature.

6. The power system according to claim 1, wherein: The aforementioned device is a vehicle, When the control unit determines that power can be supplied to the device, it starts supplying power from the fuel cell to the device and controls the device so that the driving force output by the motor operated by the power generated by the fuel cell can be transmitted to the wheels.

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