JP2008004320A - Fuel cell system, and mobile unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To aim at elongation of service life of both a fuel cell and an injector in a fuel cell system. <P>SOLUTION: The fuel cell system 1 provided with a fuel cell 10, a fuel supply channel 31 for circulating fuel gas supplied from a fuel supply source 30 to the fuel cell 10, and an injector 35 adjusting a state of gas at an upstream side of the fuel supply channel 31 and supplying it downstream, is further provided with a pressure buffer means ( a regulator 34b) for attenuating pressure changes of fuel gas at a downstream side of the injector of the fuel supply channel 31. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel cell system and a moving body.

  2. Description of the Related Art Conventionally, a fuel cell system including a fuel cell that generates power by receiving a supply of reaction gas (fuel gas and oxidizing gas) has been proposed and put into practical use. Such a fuel cell system is provided with a fuel supply passage for flowing fuel gas supplied from a fuel supply source such as a hydrogen tank to the fuel cell. Generally, a pressure regulating valve (regulator) that reduces the supply pressure of the fuel gas to a certain value is provided. At present, the fuel gas supply pressure is changed according to the operating state of the system by providing the fuel supply flow path with a mechanically adjustable pressure valve (variable regulator) that changes the fuel gas supply pressure in two stages, for example. The technique to make is proposed (for example, refer patent document 1).

In recent years, a technique has been proposed in which an injector is disposed in a fuel supply channel of a fuel cell system, and the fuel gas supply pressure in the fuel supply channel is adjusted by controlling the operating state of the injector. . The injector is an electromagnetically driven on-off valve that can adjust the gas state (gas flow rate and gas pressure) by driving the valve body directly with a predetermined driving cycle with electromagnetic driving force and separating it from the valve seat It is. By controlling the fuel gas injection timing and injection time by driving the valve body of the injector, the control device can control the flow rate and pressure of the fuel gas.
JP 2004-139984 A

  However, when an electromagnetically driven on / off valve such as an injector is disposed in the fuel supply channel of the fuel cell system, pulsation (change in fuel gas pressure) downstream of the on / off valve due to the structural characteristics of the on / off valve Is likely to occur. When such pulsation occurs, each component in the fuel cell is repeatedly subjected to stress, and thus there is a problem that the useful life of the fuel cell is shortened. On the other hand, if the on / off valve drive cycle is shortened in order to suppress the occurrence of such pulsation, a new problem arises that the service life of the on / off valve is shortened.

  The present invention has been made in view of such circumstances, and an object of the present invention is to extend the useful life of both the fuel cell and the on-off valve (for example, an injector) in the fuel cell system.

  In order to achieve the above object, a fuel cell system according to the present invention includes a fuel cell, a fuel supply channel for flowing fuel gas supplied from a fuel supply source to the fuel cell, and an upstream of the fuel supply channel. A fuel cell system comprising an on-off valve that adjusts the gas state on the side and supplies the gas to the downstream side, comprising pressure buffering means for reducing the pressure change of the fuel gas on the downstream side of the on-off valve of the fuel supply passage It is.

  When such a configuration is adopted, the pressure change of the fuel gas (pulsation) on the downstream side of the on-off valve can be reduced by the pressure buffer means. Accordingly, since it is possible to reduce the repeated stress applied to each component in the fuel cell, it is possible to realize a long life of the fuel cell. Moreover, since the pulsation on the downstream side of the on-off valve can be reduced by the pressure buffering means, it is not necessary to shorten the driving cycle of the on-off valve for the purpose of reducing the pulsation. Accordingly, it is possible to realize a longer service life of the on-off valve. An injector can be adopted as the on-off valve. In the present invention, the “gas state” means a gas state represented by a flow rate, pressure, temperature, molar concentration or the like, and particularly includes at least one of a gas flow rate and a gas pressure.

  In the fuel cell system, a pressure buffering means having a mechanical pressure regulating valve (for example, a diaphragm pressure regulating valve) can be employed.

  Further, in the fuel cell system, a plurality of gas passages which are provided in parallel between the on-off valve and the fuel cell and constitute a part of the fuel supply passage, and an electromagnetic pressure regulating valve provided in each gas passage And a pressure buffering means that controls the opening / closing operation of each electromagnetic pressure regulating valve in response to the opening / closing operation of the opening / closing valve. In such a case, an injector can be employed as the electromagnetic pressure regulating valve.

  In the fuel cell system, pressure buffering means having a volume chamber disposed between the on-off valve and the fuel cell and having a flow passage cross-sectional area larger than the fuel supply flow passage may be employed.

  In the fuel cell system, it is preferable that the upper limit value of the pressure of the fuel gas on the downstream side of the pressure buffering unit is set to be equal to or lower than the upper limit value of the pressure resistance of the fuel cell.

  By doing in this way, even when the on-off valve fails to open, it is possible to suppress the fuel gas having a pressure exceeding the pressure resistance upper limit value from being supplied to the fuel cell. Further, since it is not necessary to provide a relief flow path or a relief valve in preparation for an open failure of the on-off valve, the system configuration can be simplified. Further, even if the upper limit value of the fuel gas pressure on the downstream side of the on-off valve exceeds the withstand pressure upper limit value, the upper limit value of the fuel gas pressure (the pressure of the fuel gas supplied to the fuel cell) on the downstream side of the pressure buffer means Can be suppressed below the withstand voltage upper limit. Therefore, it is possible to increase the upper pressure regulation value of the on-off valve (expand the pressure regulation range).

  Moreover, the moving body which concerns on this invention is provided with the said fuel cell system.

  According to such a configuration, since the fuel cell system capable of realizing a long service life of both the fuel cell and the on-off valve is provided, it is possible to extend the service life of the moving body itself. .

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to implement | achieve the prolongation of the lifetime of both a fuel cell and an on-off valve (for example, injector) in a fuel cell system.

  Hereinafter, a fuel cell system 1 according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, an example in which the present invention is applied to an on-vehicle power generation system of a fuel cell vehicle (moving body) will be described.

  First, the configuration of the fuel cell system 1 according to the embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the fuel cell system 1 according to the present embodiment includes a fuel cell 10 that generates electric power upon receiving a supply of reaction gas (oxidation gas and fuel gas), and the fuel cell 10 has an oxidant gas. An oxidizing gas piping system 2 for supplying the air, a hydrogen gas piping system 3 for supplying hydrogen gas as a fuel gas to the fuel cell 10, a control device 4 for integrated control of the entire system, and the like.

  The fuel cell 10 has a stack structure in which a required number of unit cells that generate power upon receiving a reaction gas are stacked. The electric power generated by the fuel cell 10 is supplied to a PCU (Power Control Unit) 11. The PCU 11 includes an inverter, a DC-DC converter, and the like that are disposed between the fuel cell 10 and the traction motor 12. Further, the fuel cell 10 is provided with a current sensor 13 for detecting a current during power generation.

  The oxidant gas piping system 2 includes an air supply passage 21 that supplies the oxidant gas (air) humidified by the humidifier 20 to the fuel cell 10, and an air exhaust that guides the oxidant off-gas discharged from the fuel cell 10 to the humidifier 20. A flow path 22 and an exhaust flow path 23 for guiding the oxidizing off gas from the humidifier 21 to the outside are provided. The air supply passage 21 is provided with a compressor 24 that takes in the oxidizing gas in the atmosphere and pumps it to the humidifier 20.

  The hydrogen gas piping system 3 includes a hydrogen tank 30 as a fuel supply source storing high-pressure hydrogen gas, and a hydrogen supply flow path 31 as a fuel supply flow path for supplying the hydrogen gas in the hydrogen tank 30 to the fuel cell 10. And a circulation flow path 32 for returning the hydrogen off-gas discharged from the fuel cell 10 to the hydrogen supply flow path 31. Instead of the hydrogen tank 30, a reformer that generates a hydrogen-rich reformed gas from a hydrocarbon-based fuel, a high-pressure gas tank that stores the reformed gas generated by the reformer in a high-pressure state, and Can also be employed as a fuel supply source. A tank having a hydrogen storage alloy may be employed as a fuel supply source.

  The hydrogen supply channel 31 is provided with a shutoff valve 33 that shuts off or allows the supply of hydrogen gas from the hydrogen tank 30, regulators 34 a and 34 b that adjust the pressure of the hydrogen gas, and an injector 35. A primary pressure sensor 41 and a temperature sensor 42 that detect the pressure and temperature of the hydrogen gas in the hydrogen supply flow path 31 are provided on the upstream side of the injector 35. A secondary side pressure sensor that detects the pressure of the hydrogen gas in the hydrogen supply channel 31 is located downstream of the injector 35 and upstream of the junction A1 between the hydrogen supply channel 31 and the circulation channel 32. 43 is provided.

  The regulators 34a and 34b are devices that regulate the upstream pressure (primary pressure) to a preset secondary pressure. In the present embodiment, mechanical pressure regulating valves (pressure reducing valves) that reduce the primary pressure are employed as the regulators 34a and 34b. The mechanical pressure control valve has a structure in which a back pressure chamber and a pressure control chamber are formed with a diaphragm therebetween, and the primary pressure is reduced to a predetermined pressure in the pressure control chamber by the back pressure in the back pressure chamber. Therefore, a known configuration (diaphragm type pressure regulating valve) that uses the secondary pressure can be employed.

  In the present embodiment, as shown in FIG. 1, the upstream pressure of the injector 35 can be effectively reduced by disposing the first regulator 34 a on the upstream side of the injector 35. For this reason, the design freedom of the mechanical structure (a valve body, a housing, a flow path, a drive device, etc.) of the injector 35 can be increased. In addition, since the upstream pressure of the injector 35 can be reduced, it is possible to prevent the valve body of the injector 35 from becoming difficult to move due to an increase in the differential pressure between the upstream pressure and the downstream pressure of the injector 35. be able to. Accordingly, it is possible to widen the adjustable pressure width of the downstream pressure of the injector 35 and to suppress a decrease in responsiveness of the injector 35.

  Further, in the present embodiment, as shown in FIG. 1, by arranging the second regulator 34 b on the downstream side of the injector 35, the pressure change (pulsation) of the hydrogen gas on the downstream side of the injector 35 in the hydrogen supply channel 31. ) Can be reduced. That is, the second regulator 34b corresponds to an embodiment of the pressure buffering means in the present invention. In the present embodiment, the upper limit value of the hydrogen gas pressure on the downstream side of the second regulator 34 b is set to be equal to or lower than the withstand pressure upper limit value of the fuel cell 10.

  The injector 35 is an electromagnetically driven on-off valve capable of adjusting the gas flow rate and gas pressure by driving the valve body directly with a predetermined driving cycle with an electromagnetic driving force and separating it from the valve seat. The injector 35 includes a valve seat having an injection hole for injecting gaseous fuel such as hydrogen gas, a nozzle body for supplying and guiding the gaseous fuel to the injection hole, and an axial direction (gas flow direction) with respect to the nozzle body. And a valve body that is movably accommodated and opens and closes the injection hole. In this embodiment, the valve body of the injector 35 is driven by a solenoid that is an electromagnetic drive device, and the opening area of the injection hole is made two or more stages by turning on and off the pulsed excitation current supplied to the solenoid. It can be switched. The gas injection time and gas injection timing of the injector 35 are controlled by a control signal output from the control device 4, whereby the flow rate and pressure of hydrogen gas are controlled with high accuracy. The injector 35 directly opens and closes the valve (valve body and valve seat) with an electromagnetic driving force, and has a high responsiveness because its driving cycle can be controlled to a highly responsive region.

  Injector 35 changes the opening area (opening) and the opening time of the valve body provided in the gas flow path of injector 35 in order to supply the required gas flow rate downstream thereof, thereby reducing the downstream flow rate. The gas flow rate (or hydrogen molar concentration) supplied to the side (fuel cell 10 side) is adjusted. Since the gas flow rate is adjusted by opening and closing the valve body of the injector 35 and the gas pressure supplied downstream of the injector 35 is reduced from the gas pressure upstream of the injector 35, the injector 35 is controlled by a pressure regulating valve (pressure reducing valve, regulator). ). Further, in the present embodiment, an electromagnetic type capable of changing the pressure adjustment amount (pressure reduction amount) of the upstream gas pressure of the injector 35 so as to match the required pressure within a predetermined pressure range in accordance with the gas demand. It can also be interpreted as a modulatable pressure valve.

  In the present embodiment, as shown in FIG. 1, the injector 35 is disposed on the upstream side of the junction A <b> 1 between the hydrogen supply flow path 31 and the circulation flow path 32. Further, as shown by a broken line in FIG. 1, when a plurality of hydrogen tanks 30 are employed as the fuel supply source, the hydrogen gas supplied from each hydrogen tank 30 joins more than the part (hydrogen gas joining part A2). The injector 35 is arranged on the downstream side.

  A discharge flow path 38 is connected to the circulation flow path 32 via a gas-liquid separator 36 and an exhaust drain valve 37. The gas-liquid separator 36 collects moisture from the hydrogen off gas. The exhaust / drain valve 37 is operated according to a command from the control device 4 to discharge moisture collected by the gas-liquid separator 36 and hydrogen off-gas (fuel off-gas) containing impurities in the circulation channel 32 to the outside. (Purge). In addition, the circulation channel 32 is provided with a hydrogen pump 39 that pressurizes the hydrogen off gas in the circulation channel 32 and sends it to the hydrogen supply channel 31 side. The hydrogen off-gas discharged through the exhaust / drain valve 37 and the discharge passage 38 is diluted by the diluter 40 and merges with the oxidizing off-gas in the exhaust passage 23.

  The control device 4 detects an operation amount of an acceleration operation member (accelerator or the like) provided in the vehicle, receives control information such as an acceleration request value (for example, a required power generation amount from a load device such as the traction motor 12), Control the operation of various devices in the system. In addition to the traction motor 12, the load device is an auxiliary device (for example, a compressor 24, a hydrogen pump 39, a cooling pump motor, or the like) necessary for operating the fuel cell 10, and various types of vehicles involved in traveling of the vehicle. It is a collective term for power consumption devices including actuators used in devices (transmissions, wheel control devices, steering devices, suspension devices, etc.), occupant space air conditioners (air conditioners), lighting, audio, and the like.

  The control device 4 is configured by a computer system (not shown). Such a computer system includes a CPU, ROM, RAM, HDD, input / output interface, display, and the like, and various control operations are realized by the CPU reading and executing various control programs recorded in the ROM. It is like that.

  Specifically, as shown in FIG. 2, the control device 4 is consumed by the fuel cell 10 based on the operating state of the fuel cell 10 (current value during power generation of the fuel cell 10 detected by the current sensor 13). The amount of hydrogen gas (hereinafter referred to as “hydrogen consumption”) is calculated (fuel consumption calculation function: B1). In the present embodiment, the hydrogen consumption is calculated and updated for each calculation cycle of the control device 4 using a specific calculation formula representing the relationship between the current value of the fuel cell 10 and the hydrogen consumption.

  Further, the control device 4 determines the target pressure value of hydrogen gas (to the fuel cell 10) at the downstream position of the injector 35 based on the operating state of the fuel cell 10 (current value at the time of power generation of the fuel cell 10 detected by the current sensor 13). Target gas supply pressure) (target pressure value calculation function: B2). In the present embodiment, the target at the position where the secondary pressure sensor 43 is arranged for each calculation cycle of the control device 4 using a specific map representing the relationship between the current value of the fuel cell 10 and the target pressure value. The pressure value is calculated and updated.

  Further, the control device 4 calculates a feedback correction flow rate based on the deviation between the calculated target pressure value and the pressure value (detected pressure value) at the downstream position of the injector 35 detected by the secondary pressure sensor 43 (feedback). Correction flow rate calculation function: B3). The feedback correction flow rate is a hydrogen gas flow rate that is added to the hydrogen consumption in order to reduce the deviation between the target pressure value and the detected pressure value. In the present embodiment, the feedback correction flow rate is calculated and updated every calculation cycle of the control device 4 using the PI type feedback control law.

  Further, the control device 4 determines the static flow rate upstream of the injector 35 based on the gas state upstream of the injector 35 (hydrogen gas pressure detected by the primary pressure sensor 41 and hydrogen gas temperature detected by the temperature sensor 42). (Static flow rate calculation function: B4). In the present embodiment, the static flow rate is calculated for each calculation cycle of the control device 4 using a specific calculation formula representing the relationship between the pressure and temperature of the hydrogen gas upstream of the injector 35 and the static flow rate. We are going to update.

  Further, the control device 4 calculates the invalid injection time of the injector 35 based on the gas state upstream of the injector 35 (pressure and temperature of hydrogen gas) and the applied voltage (invalid injection time calculation function: B5). In the present embodiment, the invalid injection time is calculated for each calculation cycle of the control device 4 using a specific map representing the relationship between the pressure and temperature of the hydrogen gas upstream of the injector 35, the applied voltage, and the invalid injection time. I am going to update it.

  Further, the control device 4 calculates the injection flow rate of the injector 35 by adding the hydrogen consumption amount and the feedback correction flow rate (injection flow rate calculation function: B6). Then, the control device 4 calculates the basic injection time of the injector 35 by multiplying the value obtained by dividing the injection flow rate of the injector 35 by the static flow rate by the drive cycle of the injector 35, and the basic injection time and the invalid injection time. Are added to calculate the total injection time of the injector 35 (total injection time calculation function: B7). Here, the drive cycle means a stepped (on / off) waveform cycle representing the open / close state of the injection hole of the injector 35. In the present embodiment, the drive period is set to a constant value by the control device 4.

  Then, the control device 4 controls the gas injection time and the gas injection timing of the injector 35 by sending a control signal for realizing the total injection time of the injector 35 calculated through the above-described procedure, so that the fuel cell The flow rate and pressure of the hydrogen gas supplied to 10 are adjusted.

  In the fuel cell system 1 according to the embodiment described above, the pressure change (pulsation) of the hydrogen gas on the downstream side of the injector 35 can be reduced by the second regulator 34b (pressure buffering means). Accordingly, since the repeated stress applied to each component inside the fuel cell 10 can be reduced, it is possible to realize a long service life of the fuel cell 10. Further, since the pulsation on the downstream side of the injector 35 can be reduced by the second regulator 34b, it is not necessary to shorten the drive cycle of the injector 35 for the purpose of reducing the pulsation. Therefore, it is possible to realize a longer service life of the injector 35.

  Further, in the fuel cell system 1 according to the embodiment described above, the upper limit value of the hydrogen gas pressure on the downstream side of the second regulator 34 b is set to be equal to or lower than the withstand pressure upper limit value of the fuel cell 10. Even when an open failure occurs in the fuel cell 35, it is possible to suppress the supply of hydrogen gas having a pressure exceeding the pressure resistance upper limit value to the fuel cell 10. Further, since it is not necessary to provide a relief flow path or a relief valve in preparation for an open failure of the injector 35, the configuration of the system can be simplified. Even if the upper limit value of the hydrogen gas pressure on the downstream side of the injector 35 exceeds the withstand pressure upper limit value, the pressure of the hydrogen gas on the downstream side of the second regulator 34b (the pressure of the hydrogen gas supplied to the fuel cell 10). ) Can be kept below the upper limit of the pressure resistance. Therefore, it is possible to increase the upper pressure regulation value of the injector 35 (expand the adjustable pressure width).

  In addition, since the fuel cell vehicle (moving body) according to the embodiment described above includes the fuel cell system 1 capable of realizing a long service life of both the fuel cell 10 and the injector 35, Since it has a long service life, it is possible to reduce labor required for replacement and repair of the fuel cell 10 and the injector 35.

  In the above embodiment, the example in which the circulation flow path 32 is provided in the hydrogen gas piping system 3 of the fuel cell system 1 has been shown. For example, as shown in FIG. Can be directly connected to eliminate the circulation flow path 32. Even when such a configuration (dead end method) is adopted, a regulator 34b is provided on the downstream side of the injector 35 as in the above-described embodiment, and the upper limit value of the hydrogen gas pressure on the downstream side of the regulator 34b is set to the value of the fuel cell 10. By setting it to be equal to or lower than the withstand voltage upper limit value, the same effect can be obtained.

  Moreover, in the above embodiment, the example which employ | adopted the 2nd regulator 34b (for example, diaphragm type pressure regulation valve) arrange | positioned as the pressure buffer means downstream from the injector 35 was shown, but the structure of a pressure buffer means is this. It is not limited to.

  For example, as shown in FIG. 4, a plurality of gas flow paths 31 a and 31 b constituting a part of the hydrogen supply flow path 31 are provided in parallel between the injector 35 and the fuel cell 10, and each gas flow path 31 a, 31 b is provided with electromagnetic valves (electromagnetic pressure regulating valves) 44 a and 44 b, and the opening and closing operations of the electromagnetic valves 44 a and 44 b are controlled by the control device 4 in response to the opening and closing operations of the injector 35. Can also be reduced.

  In the above-described configuration, the control device 4 makes the drive periods of the solenoid valves 44a and 44b different, makes the drive periods of the solenoid valves 44a and 44b the same, slightly shifts the phase, or opens the injection holes of the solenoid valves 44a and 44b. By making the areas different, pulsation on the downstream side of the injector 35 can be reduced. In such a configuration, the control device 4 functions as control means in the present invention. Further, the gas flow path 31a, 31b, the electromagnetic valves 44a, 44b, and the control device 4 constitute the pressure buffering means in the present invention. An injector can be adopted as the solenoid valves 44a and 44b.

  Further, instead of the second regulator 34b, a buffer tank (volume chamber) having a channel cross-sectional area larger than that of the hydrogen supply channel 31 is provided between the injector 35 and the fuel cell 10, and hydrogen gas is temporarily supplied to the buffer tank. Therefore, the pulsation on the downstream side of the injector 35 can be reduced by storing and discharging to the downstream side. In addition, any configuration may be employed as long as the change in the pressure of the hydrogen gas on the downstream side of the injector of the hydrogen supply channel 31 can be reduced.

  Moreover, in the above embodiment, the example which provided the cutoff valve 33 and the 1st regulator 34a in the injector 35 upstream side of the hydrogen supply flow path 31 was shown, However, The injector 35 fulfill | performs the function as a modulation | alteration pressure valve. In addition, since it also functions as a shutoff valve that shuts off the supply of hydrogen gas, the shutoff valve 33 and the first regulator 34a are not necessarily provided. Therefore, when the injector 35 is employed, the shut-off valve 33 and the upstream regulator 34a can be omitted, so that the system can be reduced in size and cost.

  Moreover, in the above embodiment, although the example which employ | adopted the injector 35 as an on-off valve in this invention was shown, an on-off valve adjusts the gas state of the upstream of a fuel supply flow path (hydrogen supply flow path 31). What is necessary is just to supply to the downstream side, and it is not restricted to the injector 35.

  Further, in each of the above embodiments, the example in which the fuel cell system according to the present invention is mounted on the fuel cell vehicle has been shown. However, the present invention is applied to various moving bodies (robots, ships, aircrafts, etc.) other than the fuel cell vehicle. Such a fuel cell system can also be mounted. Further, the fuel cell system according to the present invention may be applied to a stationary power generation system used as a power generation facility for a building (house, building, etc.).

1 is a configuration diagram of a fuel cell system according to an embodiment of the present invention. It is a control block diagram for demonstrating the control aspect of the control apparatus of the fuel cell system shown in FIG. It is a block diagram which shows the modification of the fuel cell system shown in FIG. FIG. 6 is a configuration diagram showing another modification of the fuel cell system shown in FIG. 1.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Fuel cell system, 4 ... Control apparatus (pressure buffer means), 10 ... Fuel cell, 30 ... Hydrogen tank (fuel supply source), 31 ... Hydrogen supply flow path (fuel supply flow path), 31a * 31b ... Gas flow Path (pressure buffering means), 34b ... second regulator (pressure buffering means, mechanical pressure regulating valve), 35 ... injector (open / close valve), 44a, 44b ... electromagnetic valve (pressure buffering means, electromagnetic pressure regulating valve).

Claims (9)

A fuel cell, a fuel supply channel for flowing fuel gas supplied from a fuel supply source to the fuel cell, and an on-off valve that adjusts the gas state upstream of the fuel supply channel and supplies it downstream A fuel cell system comprising:
A pressure buffering means for reducing a pressure change of the fuel gas on the downstream side of the on-off valve of the fuel supply channel;
Fuel cell system. The pressure buffer means has a mechanical pressure regulating valve.
The fuel cell system according to claim 1. The mechanical pressure regulating valve is a diaphragm pressure regulating valve.
The fuel cell system according to claim 2. The pressure buffering means includes a plurality of gas passages provided in parallel between the on-off valve and the fuel cell and constituting a part of the fuel supply passage, and an electromagnetic type provided in each gas passage. A pressure regulating valve, and a control means for controlling the opening / closing operation of each electromagnetic pressure regulating valve in response to the opening / closing operation of the opening / closing valve.
The fuel cell system according to claim 1. The electromagnetic pressure regulating valve is an injector.
The fuel cell system according to claim 4. The pressure buffer means has a volume chamber that is disposed between the on-off valve and the fuel cell and has a larger cross-sectional area than the fuel supply flow path.
The fuel cell system according to claim 1. The upper limit value of the pressure of the fuel gas on the downstream side of the pressure buffer means is set to be equal to or lower than the withstand pressure upper limit value of the fuel cell.
The fuel cell system according to any one of claims 1 to 6. The on-off valve is an injector;
The fuel cell system according to any one of claims 1 to 7.   A moving body comprising the fuel cell system according to any one of claims 1 to 8.

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