JP2005276578A - Fluid supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly detect normal supply and abnormal supply of fluid to system forming apparatuses without relying on a flow sensor or the like, by suppressing influence of disturbance. <P>SOLUTION: A fuel cell system including a stack 1 is equipped with a water pump 11 to supply water to be reformed to a reforming apparatus 2 through a water line 5, a temperature sensor 15 to detect the temperature of the water to be reformed in the water line 5, an inside temperature sensor 17 to detect the inside temperature of the reforming apparatus 2, and a controller 20. The controller 20 controls the water pump 11 so as to give periodical fluctuation to the supply condition of the water to be reformed. The controller 20 determines abnormal supply of the water to be reformed to the reforming apparatus 2 based on the detected temperature of the water to be reformed and the detected inside temperature. If the supply of the water to be reformed is determined abnormal, the controller 20 stops the operation of this system. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fluid supply system including fluid supply means for supplying a fluid to a predetermined component device through a pipe.

  Conventionally, a fuel cell system is composed of various devices such as a fuel cell and a reformer. A fuel cell generates power by receiving supply of a reformed gas and an oxidant gas as fuel gas. The reformer receives the supply of the raw material gas as the reforming raw material and the reforming water, and generates the reformed gas. Here, in order to stably operate the fuel cell system, it is necessary to stably supply a required fluid to the above-described components such as the fuel cell and the reformer. For example, for a fuel cell, it is necessary to stabilize the supply flow rate of the reformed gas or oxidant gas. Further, regarding the reformer, it is necessary to stabilize the supply flow rate of the raw material gas or reforming water and the circulation flow rate of the heat recovery refrigerant. When a booster pump or the like is used as a supply device for these fluids, some pulsation is unavoidable, but attempts have been made to reduce pulsation by installing an orifice or a flow rate adjusting valve in the pipe.

  In the fuel cell generator described in Patent Document 1 below, in order to keep the reforming water supply flow rate to the reformer stable, the piping in which the reforming water discharged from the water pump is transferred to the reformer Is provided with a diaphragm mechanism.

  In the fuel cell system described in Patent Document 2 below, a pressure loss part such as an orifice is provided in the middle of the piping, and a pressure difference before and after the pressure loss part is detected. The fluid flow rate is stabilized by controlling the fluid flow rate based on the detected pressure difference or the like.

  Patent Document 3 listed below is based on the hydraulic pulsation detected by a hydraulic sensor in response to pump operation in order to accurately determine whether there is a pump abnormality in a hydraulic brake device in a field different from the fuel cell system. It is described that the pump abnormality is determined.

  Patent Document 4 below relates to a fluid detection device used in the field of industrial machinery engines, etc., and is provided with a piezoelectric element in contact with a flow passage through which liquid flows pulsatingly, and the pulsation pressure in the flow passage is piezoelectric. It is described that a malfunction (abnormality) of a flow path is detected based on a voltage obtained by acting on an element.

JP 2003-132920 A (page 2-3, FIG. 1) JP 2003-151602 A (2nd and 5th pages, FIGS. 1 and 2) Japanese Patent Laid-Open No. 11-11297 (page 2-5, FIGS. 1 and 3) JP-A-1-197623 (page 1-4, FIGS. 1 and 5)

  However, the above-mentioned Patent Documents 1 and 2 do not have any solution technology that assumes that the supply of a fluid such as gas or water stops due to a failure of a supply device such as a pump or an increase in pressure loss in a pipe. Not listed. In a fuel cell system, stabilizing the flow rate of fluid supplied to various components is an important condition for stable operation of the system. However, if the stop of the fluid supply itself cannot be detected, not only the operation of the system cannot be continued, but also the components of the system may be damaged.

  On the other hand, in Patent Documents 3 and 4 described above, fluid detection means such as a hydraulic sensor and a piezoelectric element are installed in the pipe in order to detect abnormality of the pump and the flow path. However, if the fluid detection means itself is out of order, the supply stop state cannot be properly detected when the fluid detection means outputs erroneously even though the fluid supply is stopped ( First case). Further, when the output of the fluid detection means is erroneously zero even though the fluid is being supplied, the supply state cannot be detected properly (second case). In such a case, it is difficult to determine whether or not the fluid detection unit itself is in failure, and in the first case, there is a risk of failure of other components in the fuel cell system. In the second case, it is necessary to stop the operation of the fuel cell system immediately upon failure of the fluid detection means.

  The present invention has been made in view of the above circumstances, and an object of the present invention is not to rely on fluid detection means such as a flow meter or a pressure sensor, or to be used in addition to the fluid detection means. It is an object of the present invention to provide a fluid supply system capable of properly detecting a normal supply of fluid and an abnormal supply of fluid with respect to disturbance while suppressing the influence of disturbance.

In order to achieve the above object, the invention according to claim 1 is directed to a fluid supply means for supplying a predetermined fluid to a predetermined component device through a pipe, and for heating or cooling the fluid provided in the middle of the pipe. Fluid temperature changing means, and a detecting means for detecting a fluid state in a pipe between the fluid temperature changing means and the component device, and the detection means when a predetermined fluctuation is given to the fluid supply state It is intended to include an abnormality determining means for determining an abnormality in supply of fluid to the constituent devices based on the state of the fluid.
Here, the fluid supply abnormality means that the flow rate of the fluid in the pipe decreases, and as a cause thereof, when the amount of fluid supplied by the fluid supply means decreases, when fluid leaks from the pipe, foreign matter in the pipe May be clogged or the filters may be clogged.

  According to the configuration of the above invention, when a predetermined fluctuation is given to the supply state of the fluid, if the fluid is normally supplied to the component equipment, the detection is performed by the detection means in the fluid temperature changing means and the piping of the component equipment. The state of the fluid varies according to the variation of the fluid supply state. On the other hand, when the fluid is not normally supplied to the component device, that is, when the supply is abnormal, the state of the fluid detected by the detecting means shows a variation that does not correspond to the variation of the fluid supply state. The abnormality determination means determines a fluid supply abnormality to the component device based on such a fluid state. Further, even when the fluid detection means fails, if the abnormality determination means determines that the fluid supply is normal, the system can continue to operate, and it can be determined that the fluid detection means is faulty. .

  In order to achieve the above object, the invention according to claim 2 is the invention according to claim 1, wherein the detection means is means for detecting the temperature of the fluid.

  According to the configuration of the invention described above, in addition to the operation of the invention described in claim 1, the fluctuation given to the supply state of the fluid is caused by the fluid being heated or cooled by the fluid temperature changing means. It is reflected in the fluctuations. Therefore, it is possible to effectively detect the fluctuation of the supply state of the fluid using the means for detecting the temperature of the fluid.

  In order to achieve the above object, the invention described in claim 3 is the invention described in claim 1 or 2, wherein the fluid supply state is the pressure of the fluid.

  According to the configuration of the invention described above, in addition to the operation of the invention according to claim 1 or 2, in the case where the fluid supply abnormality is that the foreign matter is clogged in the pipe, the foreign matter is changed by changing the pressure of the fluid. Can also be removed.

  In order to achieve the above object, the invention described in claim 4 is used in the fluid supply device or the cooling device of the fuel cell system in the invention described in any one of claims 1 to 3.

  According to the configuration of the above invention, in addition to the operation of the invention according to any one of claims 1 to 3, it is effective for detecting an abnormality in fluid supply in the fuel cell system.

  According to the first aspect of the present invention, in the fluid supply system, normal supply of fluid to the components of the system can be achieved without relying on fluid detection means such as a flow meter or in addition to fluid detection means. And fluid supply abnormality can be properly detected while suppressing the influence of disturbance.

  According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the normal supply of the fluid and the abnormal supply of the fluid to the components constituting the system using the fluid temperature detecting means are performed. It can be detected effectively.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, it is possible to eliminate minor supply abnormality such as foreign matter clogging in the pipe.

  According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, it can be effectively used for detecting abnormality of fluid supply in the fuel cell system.

[First Embodiment]
Hereinafter, a first embodiment in which a fluid supply system of the present invention is embodied in a fuel cell system will be described in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration diagram of a fuel cell system. This fuel cell system includes a fuel cell (stack) 1, a reformed gas line 3 for supplying a reformed gas containing hydrogen from a reformer 2 to the stack 1, and an oxidant gas (cathode) containing oxygen in the stack 1. A cathode air line 4 for supplying air), a reforming water line 5 for supplying reforming water to the reformer 2, and a source gas line 6 for supplying reforming raw material (raw material gas) to the reformer 2. Prepare. The cathode air that has passed through the stack 1 is discharged as exhaust. The reformed gas line 3 branches into a first reformed gas line 3 a that passes through the stack 1 and a second reformed gas line 3 b that does not pass through the stack 1.

  The stack 1 includes a polymer electrolyte membrane that selectively transports hydrogen ions, and an anode and a cathode that are a pair of electrodes provided on both surfaces of the electrolyte membrane. The stack 1 is supplied with the reformed gas and the cathode air, and generates and generates heat by causing these gases to react electrochemically.

  The reformer 2 corresponding to the component device of the present invention receives the supply of the raw material gas and the reformed water, generates the reformed gas, and guides the gas to the reformed gas line 3. The reformer 2 includes a reforming unit, a shift unit, and a selective oxidation unit. The reformer 2 includes a warming-up combustion unit 7. The combustion section 7 is supplied with combustion raw materials (natural gas or the like) and reformed gas via the first and second reformed gas lines 3a and 3b as fuel gas. In addition, combustion air is supplied to the combustion unit 7.

In the reformed water line 5 as the pipe of the present invention, a water tank 10, a water pump 11, a water purifier 12, a flow rate sensor 13, an evaporator 14 and a temperature sensor 15 are provided in this order from the upstream side. The water tank 10 stores reformed water that serves as a reforming raw material. The water pump 11 pumps the reformed water in the water tank 10 to the reformer 2 through the reformed water line 5. The water pump 11 uses a motor as a drive source, and adjusts the pumping output (discharge flow rate) of the reforming water by changing the rotation speed of the motor. The water pump 11 corresponds to the fluid supply means and the pressure feeding means of the present invention. The water purifier 12 filters the reformed water supplied from the water tank 10 and includes a filter and a pure water device. The flow sensor 13 detects the reformed water flow rate Qw in the reformed water line 5. The evaporating unit 14 evaporates the reforming water supplied to the reformer 2. The evaporation unit 14 is heated by flowing exhaust gas discharged from the combustion unit 7 of the reformer 2 through the exhaust line 16. In this embodiment, the evaporating section 14 corresponds to the fluid temperature changing means of the present invention provided in the middle of the reforming line 5 for heating the reforming water.
The temperature sensor 15 is for detecting the temperature of the reformed water (reformed water temperature T1) in the reformed water line 5 at the outlet of the evaporator 14, and corresponds to the detection means of the present invention. On the downstream side of the temperature sensor 15, the raw material gas line 6 joins the reformed water line 5. Due to this merging, the reformed steam and the raw material gas are mixed and supplied to the reformer 2 as a raw material for generating the reformed gas. Note that the arrangement of the water pump 11, the water purifier 12, and the flow sensor 13 from the water tank 10 to the evaporation unit 14 may not be in the order shown in FIG.

  On the other hand, an internal temperature sensor 17 for detecting the internal temperature T2 is provided inside the reformer 2.

  The reformer 2, the water pump 11, the flow sensor 13, the temperature sensor 15, and the internal temperature sensor 17 are electrically connected to the controller 20. The controller 20 controls the water pump 11 in order to give a predetermined fluctuation to the supply state of the reforming water. Specifically, the controller 20 controls the output of the water pump 11 in order to give a pulsation to the supply flow rate and supply pressure of reforming water at regular intervals. Further, the controller 20 determines an abnormal supply of reforming water to the reformer 2 based on the reforming water temperature T1 detected by the temperature sensor 15 and the internal temperature T2 detected by the internal temperature sensor 17. The controller 20 that executes this determination corresponds to the abnormality determination means of the present invention. Furthermore, the controller 20 stops the operation of the system when it is determined that the reforming water supply is abnormal. The controller 20 that executes this control corresponds to an operation stop control means. In addition, an alarm device 21 is connected to the controller 20. The alarm 21 is composed of a buzzer and a lamp. The controller 20 operates the alarm device 21 when various abnormalities are detected.

  Next, a specific description will be given of control related to detection of reforming water supply abnormality. FIG. 2 is a flowchart showing a control program executed by the controller 20.

  When the fuel cell system is activated in step 100, the controller 20 activates the water pump 11 with a constant output in step 110.

  Next, in step 120, the controller 20 gives a periodic fluctuation to the output of the water pump 11. That is, the controller 20 periodically changes the command flow rate for the water pump 11. Thereby, periodic fluctuations are given to the flow rate and pressure of the reforming water discharged from the water pump 11 to the reforming water line 5. The variation in the reforming water flow rate is such that it does not cause a problem in order to realize a stable system operation. As shown in the time chart of FIG. 3, the periodic fluctuation may be a fluctuation in which the reforming water flow rate increases in a pulse wave shape with respect to the instruction flow rate of the water pump 11, or a fluctuation in which the reforming water flow rate decreases in a pulse wave shape. As shown in the time chart of FIG. 4, the reforming flow rate may be a variation in which the reforming flow rate increases or decreases in a sine wave shape with respect to the command flow rate of the water pump 11.

  Next, in step 130, the controller 20 determines whether or not the reforming water flow rate Qw is detected by the flow rate sensor 13. Then, when the reforming water flow rate Qw is detected, the controller 20 returns to the process of step 120 assuming that the supply of the reforming water is normal. On the other hand, when the reforming water flow rate Qw is not detected, the controller 20 proceeds to step 140.

  In step 140, the controller 20 determines whether or not there is a periodic change in the reforming water temperature T1 detected by the temperature sensor 15. When the detected reforming water temperature T1 does not have a periodic change, the reforming water temperature T1 does not change even though the flow rate and pressure of the reforming water are periodically changed. Therefore, the process proceeds to step 150 assuming that the supply of reforming water is abnormal.

  In step 150, the controller 20 operates the alarm device 21 to notify that the reforming water supply is abnormal. In step 160, the controller 20 stops the operation of the system.

  On the other hand, if there is a change in the detected value of the reforming water temperature T1 in step 140, it is determined that there is a failure in the flow sensor 13, and the alarm 21 is operated in step 170 to notify the failure of the flow sensor 13.

  Next, in step 180, the controller 20 determines whether or not the internal temperature T2 detected by the internal temperature sensor 17 is higher than a predetermined upper limit temperature Tmax. If the internal temperature T2 is higher than the upper limit temperature Tmax, the controller 20 determines in step 150 that the reforming water supply is abnormal. In step 160, the operation of the system is stopped.

  On the other hand, if the internal temperature T2 is not higher than the upper limit value Tmax in step 180, the controller 20 determines that there is no abnormality in the supply of reforming water, and the controller 20 determines that the internal temperature T2 does not exceed the upper limit value Tmax in step 190. The system will continue to operate.

  Here, an example of the execution result of the above process is shown in the time charts of FIGS. In the time chart of FIG. 5, when the operation of the fuel cell system starts at time t0 and the water pump 11 starts at time t1, the reformed water flow rate Qw detected by the flow rate sensor 13 rises. As a result, the reforming water temperature T1 and the internal temperature T2 detected by the temperature sensor 15 and the internal temperature sensor 17 start to gradually increase.

  Thereafter, when the indicated flow rate of the water pump 11 periodically changes after time t2, the reformed water flow rate Qw periodically changes in accordance with the change, and the reforming water temperature T1 is slightly delayed from the change. Also changes periodically. In this case, since the reforming water is normally supplied to the reformer 2, the internal temperature T2 of the reformer 2 changes at a substantially constant value.

  In addition, in the time chart of FIG. 6, at the time t3 after the time t2, the reforming water supply abnormality occurs, and the reforming water flow rate Qw detected by the flow sensor 13 falls to zero. At this time, the reforming water temperature T <b> 1 detected by the temperature sensor 15 starts to rise due to heating in the evaporating unit 14 because the reforming water does not flow through the reforming water line 5. Then, since the periodic change in the reforming water temperature T1 is not determined thereafter, the operation of the fuel cell system is stopped at time t4 because the reforming water supply is abnormal.

  For example, when the reforming part of the reformer 2 is warmed up by the combustion part 7 and no reforming water is supplied and steam cannot be generated, the catalyst surface or reforming part such as the reforming part or the shift part Carbon is deposited inside the vessel 2 and hydrogen is not generated. In addition, clogging occurs inside the reformer 2 and gas does not flow sufficiently, and the reformer 2 is damaged and needs to be replaced. As described above, in this embodiment, when an abnormality occurs in the supply of reforming water, it is detected at an early stage and the operation of the system is immediately stopped, so that the reformer 2 is not damaged. .

  On the other hand, in the time chart of FIG. 7, at time t3, the flow sensor 13 breaks down and the detected value falls to zero. At this time, when the reforming water normally flows through the reforming water line 5, a periodic change in the reforming water temperature T <b> 1 detected by the temperature sensor 15 after that is determined and detected by the internal temperature sensor 17. It is determined that the internal temperature T2 changes substantially constant. In this case, even if the flow sensor 13 is out of order, there is no problem in the operation of the system within the range where the internal temperature T2 does not exceed the upper limit value Tmax, so the operation of the system is continued as it is. On the other hand, as indicated by a two-dot chain line in FIG. 7D, when the internal temperature T2 exceeds the upper limit value Tmax at time t5, the system operation is stopped as an abnormal supply of reforming water.

  According to the fuel cell system of this embodiment described above, supply of reforming water supplied to the reformer 2 through the reforming water line 5 by the controller 20 controlling the water pump 11 after the system is started. Periodic fluctuations are given to the state. Here, when the reforming water is normally supplied to the reformer 2, the reforming water temperature T1 detected by the temperature sensor 15 changes according to the periodic fluctuation of the reforming water supply state. become. Further, the internal temperature T2 detected by the internal temperature sensor 17 changes substantially constant according to the stable operation state of the reformer 2.

  On the other hand, when the reforming water is not normally supplied to the reformer 2, that is, when there is a supply abnormality, the reforming water temperature T1 detected by the temperature sensor 15 is such that the indicated flow rate of the water pump 11 varies periodically. In spite of the fact that it is accompanied, the state that does not respond to the fluctuation is shown. Further, the internal temperature T2 detected by the internal temperature sensor 17 is in an unstable state exceeding the upper limit value Tmax due to the influence of abnormal supply of reforming water. The controller 20 determines that the supply of reforming water is abnormal based on the behavior of the reforming water temperature T1 and the internal temperature T2. For this reason, without relying on the detection of the flow sensor 13, the normal supply of reforming water to the reformer 2 and the abnormal supply of reforming water are properly controlled while suppressing the influence of disturbances such as changes in environmental temperature. Can be detected.

  Further, in this embodiment, the fluctuation given to the reformed water supply state by the water pump 11 is reflected in the temperature state fluctuation of the reforming water when the reforming water is heated by the evaporation unit 14. . Therefore, it is possible to effectively detect the variation in the supply state of the reforming water using the temperature sensor 15 that detects the reforming water temperature T1. For this reason, it is possible to effectively detect normal supply of reforming water to the reformer 2 and fluid supply abnormality using the temperature sensor 15.

  In this embodiment, the pressure state as the supply state of the reforming water is changed by the water pump 11. For this reason, when the supply abnormality of reforming water is that the foreign material etc. are clogged in the reforming line 5, the foreign material can also be removed by changing the pressure of the reforming water. For this reason, it is possible to eliminate a minor supply abnormality such as the reforming line 5 being clogged with foreign matter, and to suppress the stop of the fuel cell system due to the supply abnormality.

  Further, in this embodiment, the flow rate of the reforming water is detected by using the flow rate sensor 13 together, but a failure of the sensor 13 can also be detected separately from the abnormal supply of the reforming water. Therefore, even if the flow sensor 13 fails, if the temperature sensor 15 and the internal temperature sensor 17 are normal, the operation of the system can be continued and the replacement timing of the flow sensor 13 can be measured. Therefore, the fuel cell system can be operated without being stopped until the flow sensor 13 is replaced and the system can be used continuously.

  Furthermore, according to the fuel cell system of this embodiment, when an abnormal supply of reforming water is detected, the controller 20 immediately stops the operation of the system. For this reason, it is possible to prevent the reformer 2 and the system itself from being damaged due to the supply of reforming water.

[Second Embodiment]
Next, a second embodiment in which the fluid supply system of the present invention is embodied in a fuel cell system will be described in detail with reference to the drawings.

  In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Hereinafter, different points will be mainly described.

  The system of this embodiment is different in configuration from the first embodiment in that the flow rate sensor 13 is omitted in the reforming water line 5 and a control program for coping with supply abnormality of reforming water. FIG. 8 is a flowchart showing the control program.

  In this flowchart, the processing in steps 200 to 220 is the same as the processing in steps 100 to 120 in the flowchart of FIG.

  Thereafter, in step 230, the controller 20 determines whether or not there is a periodic change in the reforming water temperature T1 detected by the temperature sensor 15. If the detected reforming water temperature T1 has a periodic change, the controller 20 returns to the process of step 220. On the other hand, if there is no periodic change in the detected reforming water temperature T1, the controller 20 proceeds to step 240.

  In step 240, the controller 20 determines whether or not the internal temperature T2 detected by the internal temperature sensor 17 is higher than a predetermined upper limit temperature Tmax. If the internal temperature T2 is higher than the upper limit temperature Tmax, the controller 20 determines in step 250 that the reforming water supply is abnormal, in order to notify the reforming water supply abnormality in step 250. In step 260, the operation of the system is stopped.

  On the other hand, if the internal temperature T2 is not higher than the upper limit value Tmax in step 240, it is determined that there is no abnormality in the supply of reforming water, and the controller 20 determines in step 270 that the internal temperature T2 does not exceed the upper limit value Tmax. The system will continue to operate.

  Therefore, even in a fuel cell system that does not have a flow rate sensor in the reforming water line 5 as in this embodiment, normal supply of reforming water to the reformer 2 and abnormal supply of reforming water The influence of disturbances such as changes can be suppressed and detected appropriately.

  Further, even in the fuel cell system of this embodiment, when an abnormal supply of reforming water is detected, the operation of the system is immediately stopped, so that the system including the reformer 2 is affected by the lack of reforming water. I do not receive it. For this reason, it is possible to prevent the reformer 2 and the present system from being damaged due to abnormal supply of reforming water.

  In addition, this invention is not limited to each said embodiment, In the range which does not deviate from the meaning of invention, it can also implement as follows.

  (1) In each of the embodiments described above, the detection of the supply abnormality of the reforming water has been described in the configuration in which the reforming water as the predetermined fluid is supplied to the reformer 2 as the predetermined constituent device. On the other hand, cooling water as a predetermined fluid is supplied to a fuel cell (stack) or a reformer as a predetermined component device, and heat is exchanged with the heat exchanger as a fluid temperature changing means. The cooling device configured as described above may be configured to detect an abnormality in the supply of cooling water.

  (2) In each of the above-described embodiments, the fluid supply system of the present invention is employed in the fuel cell system and can be effectively used for detecting an abnormality in fluid supply in the fuel cell system. It may be used to detect fluid supply anomalies.

1 is a schematic configuration diagram illustrating a fuel cell system according to a first embodiment. The flowchart which shows a control program. The time chart which shows the fluctuation | variation of the water pump instruction | indication flow volume and the reforming water flow volume. The time chart which shows the fluctuation | variation of the water pump instruction | indication flow volume and the reforming water flow volume. The time chart which shows an example of a process execution result. The time chart which shows an example of a process execution result. The time chart which shows an example of a process execution result. The flowchart which concerns on 2nd Embodiment and shows a control program.

Explanation of symbols

2 Reformer (component equipment)
5 Reformed water line (pipe)
11 Water pump (fluid supply means)
14 Evaporating part (fluid temperature changing means)
15 Temperature sensor (detection means)
20 Controller (Abnormality judgment means)
T1 reforming water temperature

Claims (4)

Fluid supply means for supplying a predetermined fluid through a pipe to a predetermined component;
Fluid temperature changing means for heating or cooling the fluid provided in the middle of the piping;
Detecting means for detecting the state of the fluid in the pipe between the fluid temperature changing means and the component device;
And an abnormality determining means for determining an abnormality in supplying the fluid to the component device based on the state of the fluid detected by the detecting means when a predetermined fluctuation is given to the supply state of the fluid. Fluid supply system. The fluid supply system according to claim 1, wherein the detection unit is a unit that detects a temperature of the fluid. The fluid supply system according to claim 1, wherein the fluid supply state is a pressure of the fluid. The fluid supply system according to any one of claims 1 to 3, wherein the fluid supply system is used for a fluid supply device or a cooling device of a fuel cell system.

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