JP2007323873A - Fuel cell system and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten starting time by suppressing the operation lag of an injector under low temperature environment or in rising of primary pressure in a fuel cell system. <P>SOLUTION: The fuel cell system 1 is equipped with a fuel cell 10; a fuel supply passage 31 for making fuel gas supplied from a fuel supply source 30 flow to the fuel cell 10; an injector 35 supplying gas to the downstream side by adjusting a gas state on the upstream side in the fuel supply passage 31; and a driving control means (a control device 4) controlling the opening and closing of the injector 35 in an upstream pressure decreased state in which a pressure value of fuel gas on the upstream side of the injector in the fuel supply passage 31 is lower than a pressure value in the ordinary operation of the fuel cell 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel cell system and a control method thereof.

  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, an on-off valve such as an injector is disposed in the fuel supply passage of the fuel cell system, and the supply pressure of the fuel gas in the fuel supply passage is adjusted by controlling the operating state of the on-off valve. Is being proposed. 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 the valve sticks to the injector or other valve due to freezing in a low temperature environment, the injector cannot be opened at the required timing (the valve body cannot be separated from the valve seat). There was a problem that system startup time was prolonged. In addition, when fuel gas is supplied from the fuel supply source and the gas pressure (primary pressure) on the upstream side of the injector rises excessively, it becomes difficult to open the injector due to the structure of the injector, and the system startup time is also reduced. Prolonged.

  The present invention has been made in view of such circumstances, and in a fuel cell system, the operation time of an on-off valve (such as an injector) is suppressed in a low-temperature environment or when the primary pressure is increased, thereby shortening the startup time. For the purpose.

  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. An on-off valve that adjusts the gas state on the side and supplies the gas to the downstream side, wherein the pressure value of the fuel gas on the upstream side of the on-off valve of the fuel supply passage is the pressure during normal operation of the fuel cell Drive control means for performing opening / closing control of the opening / closing valve in an upstream pressure lowering state lower than the value is provided.

  Further, the control method according to the present invention adjusts the fuel cell, the fuel supply channel for flowing the fuel gas supplied from the fuel supply source to the fuel cell, and the gas state upstream of the fuel supply channel. And an on-off valve that supplies to the downstream side of the fuel cell system, wherein the pressure value of the fuel gas on the upstream side of the on-off valve of the fuel supply channel is lower than the pressure value during normal operation of the fuel cell In some cases, the method includes a step of performing opening / closing control of the opening / closing valve.

  When such a configuration and method are employed, the opening / closing control of the opening / closing valve can be performed in an upstream pressure drop state in which the opening / closing valve is relatively easy to open. Therefore, for example, even when the on-off valve is stuck due to freezing or the like in a low temperature environment, recovery from the valve sticking can be completed early. As a result, the system startup time can be shortened. 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, the “upstream pressure drop state” indicates a state in which the supply of fuel gas from the fuel supply source is stopped, before the start of the fuel cell system (for example, the main stop valve of the hydrogen tank that is the fuel supply source is opened) The state before the operation), the state in which the fuel cell is in the intermittent operation mode, and the like can be employed.

  Further, in the fuel cell system, as an on / off control of the on / off valve, a control for passing an invalid current to the on / off valve can be adopted.

  By doing so, it is possible to cause a reactive current to flow through the on-off valve in a state in which the on-off valve is relatively easy to open and the upstream pressure is reduced. Therefore, even when the valve is stuck to the on-off valve due to freezing, the valve can be preheated by the reactive current to promote thawing. The “invalid current” means a current that flows through the on-off valve during the invalid injection time of the on-off valve. The “invalid injection time” means a time required from when the on-off valve receives a control signal (current) until actual injection is started.

  In the fuel cell system and the control method, an injector can be employed as the on-off valve.

  According to the present invention, in the fuel cell system, it is possible to reduce the activation time by suppressing the operation delay of the on-off valve in a low temperature environment or when the primary pressure is increased.

  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 oxidizing gas piping system 2 includes an air supply passage 21 that supplies the fuel cell 10 with the oxidizing gas (air) humidified by the humidifier 20, and an air exhaust that guides the oxidizing 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 flow path 31 is provided with a shutoff valve 33 that shuts off or allows the supply of hydrogen gas from the hydrogen tank 30, a regulator 34 that adjusts 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 regulator 34 is a device that regulates the upstream pressure (primary pressure) to a preset secondary pressure. In the present embodiment, a mechanical pressure reducing valve that reduces the primary pressure is employed as the regulator 34. The mechanical pressure reducing valve has a structure in which a back pressure chamber and a pressure adjusting chamber are formed with a diaphragm therebetween, and the primary pressure is reduced to a predetermined pressure in the pressure adjusting chamber by the back pressure in the back pressure chamber. Thus, a publicly known configuration for 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 arranging two regulators 34 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.

  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 the present 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, a variable pressure control valve 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 requirement. Can also be interpreted.

  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 channel 38 is connected to the circulation channel 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.

  Further, the control device 4 sends a control signal (for example, a reactive current) to the injector 35 in a state where the pressure value of the hydrogen gas on the upstream side of the injector 35 in the hydrogen supply flow path 31 is lower than the predetermined threshold value. Then, opening / closing control of the injector 35 is performed. That is, the control device 4 functions as drive control means. In the present embodiment, as the “predetermined threshold value”, the pressure value during normal operation of the fuel cell 10 (for example, the hydrogen on the upstream side of the injector 35 when the fuel cell 10 continuously generates power for a certain period of time). Gas pressure average value) is adopted.

  In the “upstream pressure drop state”, the shutoff valve 33 is closed and the supply of hydrogen gas from the hydrogen tank 30 is stopped, and the pressure value of the hydrogen gas upstream of the injector 35 by the operation of the regulator 34 is a predetermined threshold value. A state in which the fuel cell system 1 is further lowered, a state before the start of the fuel cell system 1 (that is, before the main stop valve of the hydrogen tank 30 is opened), a state in which the fuel cell 10 is in the intermittent operation mode, and the like. In the intermittent operation mode, for example, the power generation of the fuel cell 10 is temporarily stopped during low load operation such as idling, low-speed traveling, regenerative braking, and the like, and the traction motor 12 is connected from a power storage device such as a battery or a capacitor. This means an operation mode in which electric power is supplied to a load device such as hydrogen gas and air are supplied intermittently to the fuel cell 10 so as to maintain an open-ended voltage.

  Next, a control method of the fuel cell system 1 according to the present embodiment will be described using the flowchart of FIG. 3 and the time chart of FIG.

  During normal operation of the fuel cell system 1, hydrogen gas is supplied from the hydrogen tank 30 to the fuel electrode of the fuel cell 10 through the hydrogen supply channel 31, and the air that has been subjected to humidification adjustment passes through the air supply channel 21. Then, power is generated by being supplied to the oxidation electrode of the fuel cell 10. At this time, the power (required power) to be drawn from the fuel cell 10 is calculated by the control device 4, and hydrogen gas and air in an amount corresponding to the amount of power generation are supplied into the fuel cell 10. In the present embodiment, a delay in starting the system due to freezing of the injector 35 when the operation of the fuel cell system 1 is stopped in a low temperature environment such as below freezing from the normal operation is suppressed.

First, the control device 4 of the fuel cell system 1 determines whether or not there is an operation start signal in an operation stop state in a low temperature environment (operation start determination step: S1). When the control device 4 detects an operation start signal (ignition switch ON signal) as shown in FIG. 4A, the control device 4 uses the primary pressure sensor 41 to upstream the injector 35 of the hydrogen supply flow path 31. detects the pressure (primary pressure) of hydrogen gas at the side (primary pressure detecting step: S2), the primary pressure P determines whether it is below a predetermined threshold P ₀ (primary pressure determination step: S3).

Next, when it is determined in the primary pressure determination step S3 that the primary pressure P has become less than the predetermined threshold value P ₀ , the control device 4 sends a control signal (drive command) to the injector 35 as shown in FIG. ) To perform opening / closing control of the injector 35 (injector control step: S4). Then, as shown in FIG. 4C, the control device 4 sends a control signal (drive command) to the main stop valve of the hydrogen tank 30 after a predetermined time has elapsed since the time when the control signal was sent to the injector 35. The hydrogen tank 30 is opened and the fuel cell system 1 is activated (system activation process: S5). By passing through the above process group, even when the injector 35 is frozen in a low temperature environment, the system can be started quickly.

It should be noted that the primary pressure threshold P ₀ (control start condition for the injector 35) employed in the primary pressure determination step S3 and the period from when the control signal is sent to the injector 35 until the control signal is sent to the main stop valve of the hydrogen tank 30. This time can be appropriately set according to the pressure in the hydrogen tank 30, the specification and scale of the fuel cell 10, and the like. For example, as shown in FIG. 4C, the time from when the control signal is sent to the injector 35 to when the control signal is sent to the main stop valve of the hydrogen tank 30 is matched with the invalid injection time or the invalid injection time. Can be longer. In this way, the opening operation of the injector 35 can be surely preceded by the opening operation of the main stop valve of the hydrogen tank 30.

  In the fuel cell system 1 according to the embodiment described above, in a state where the injector 35 is relatively easy to open and the upstream pressure is reduced (state before starting the system), a control signal (for example, a reactive current) is sent to the injector 35. 35 open / close control can be performed. Accordingly, even in the case where the valve sticking occurs in the injector 35 due to freezing in a low temperature environment or the like, the valve of the injector 35 can be preheated by the current as the control signal and the thawing can be promoted. Recovery from sticking can be completed early. As a result, the system startup time can be shortened.

  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, the control signal is sent to the injector 35 in the upstream pressure drop state (for example, the state before starting the system) in which the injector 35 is relatively easy to open in the control device 4 as in the above embodiment. To control the opening and closing of the injector 35, the same effect can be obtained.

  Moreover, in the above embodiment, although the example which performed the opening / closing control of the injector 35 in the state before starting of the fuel cell system 1 (before opening of the main stop valve of the hydrogen tank 30) was shown, the opening / closing control of the injector 35 was shown. The time (state) for performing the operation is not limited to this. For example, the state in which the shutoff valve 33 is closed and the supply of hydrogen gas from the hydrogen tank 30 is stopped, the pressure value of the hydrogen gas on the upstream side of the injector 35 is lowered below a predetermined threshold by the operation of the regulator 34, the fuel cell In a state where the upstream pressure is reduced, such as when 10 is in the intermittent operation mode, it is possible to control opening and closing of the injector 35 by sending a control signal to the injector 35.

  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 supply flow path (hydrogen supply flow path 31), and is downstream. As long as it supplies to the side, it is not limited 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. 2 is a flowchart for explaining a control method of the fuel cell system shown in FIG. 1. 2 is a time chart for explaining a control method of the fuel cell system shown in FIG. 1, wherein (A) shows a time history of an operation start signal, and (B) shows a time history of an injector control signal (drive command). (C) shows the time history of the control signal (drive command) of the main stop valve of the hydrogen tank. It is a block diagram which shows the modification of the fuel cell system shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Fuel cell system, 4 ... Control apparatus (drive control means), 10 ... Fuel cell, 30 ... Hydrogen tank (fuel supply source), 31 ... Hydrogen supply flow path (fuel supply flow path), 35 ... Injector (open / close valve) ).

Claims (8)

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:
Drive control means for performing opening / closing control of the opening / closing valve in a state where the pressure value of the fuel gas on the upstream side of the opening / closing valve of the fuel supply channel is lower than the pressure value during normal operation of the fuel cell;
Fuel cell system. The upstream pressure drop state is a state in which the supply of fuel gas from the fuel supply source is stopped.
The fuel cell system according to claim 1. The upstream pressure drop state is a state before the fuel cell system is started.
The fuel cell system according to claim 1. The upstream pressure drop state is a state where the fuel cell is in an intermittent operation mode.
The fuel cell system according to claim 1. The on / off control of the on / off valve is control for causing an invalid current to flow through the on / off valve.
The fuel cell system according to any one of claims 1 to 4. The on-off valve is an injector;
The fuel cell system according to any one of claims 1 to 5. 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 the gas downstream A control method of a fuel cell system comprising:
Including a step of performing opening / closing control of the opening / closing valve when the pressure value of the fuel gas on the upstream side of the opening / closing valve of the fuel supply channel is lower than the pressure value during normal operation of the fuel cell,
Control method of fuel cell system. Adopting an injector as the on-off valve,
The method for controlling a fuel cell system according to claim 7.

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