KR20230008562A - Apparatus and method for controlling valve of fuel cell - Google Patents

Abstract

A device for controlling a valve of a fuel cell according to an embodiment of the present invention can include: a storage unit for storing condensed water generated in a fuel cell stack; a valve that is installed at the outlet of the storage unit and discharges the condensed water; and a control unit that controls the operation of the valve using a control signal and induces vibration of the valve by controlling the frequency of the control signal.

Description

Valve control device and method of fuel cell {APPARATUS AND METHOD FOR CONTROLLING VALVE OF FUEL CELL}

The present invention relates to a valve control device and method for a fuel cell.

In the hydrogen supply system (FPS) of the fuel cell system, the FDV (condensate valve) serves to send a certain amount of water stored in the water trap (FWT) to the humidifier in the air supply line.

FDV has a built-in heater that prevents the valve from freezing, which can prevent condensate from freezing at sub-zero temperatures.

Therefore, condensed water may be frozen when the temperature of the outside air drops below freezing, such as in winter, and the frozen condensate is melted or frozen by operating the heater to prevent freezing.

At this time, since the operation of the heater is controlled independently of the operation of the FDV valve, heat generated by the heater may affect the operation of the solenoid valve used as the FDV valve. That is, in the case of the solenoid valve, when the temperature rises, the target current may change during current control, and if there is a heater operating at a high temperature nearby, there is a problem in that the life of the valve is reduced.

One object of the present invention is to provide an apparatus and method for controlling a valve of a fuel cell in which the condensate valve vibrates when the PWM control signal for controlling the condensate valve is changed to a low frequency or a high frequency.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

An apparatus for controlling a valve of a fuel cell according to an embodiment of the present invention includes a storage unit for storing condensed water generated in a fuel cell stack, a valve installed at an outlet of the storage unit and discharging the condensed water, and a control signal to control the valve. It may include a control unit that controls the operation of and controls the frequency of the control signal to induce vibration of the valve.

In an embodiment, the control unit may induce vibration of the valve by selecting a high frequency control signal output from the high frequency generator or a low frequency control signal output from the low frequency generator.

In one embodiment, the control unit may control the high frequency control signal to be output or the low frequency control signal to be output based on the outside temperature and the amount of change in temperature for a predetermined time.

In one embodiment, the control unit may control a low-frequency control signal to be output when the temperature of the outside air is lower than a predetermined temperature and the change in temperature is greater than or equal to a predetermined range.

In one embodiment, the control unit may control a high frequency control signal to be output when the outdoor temperature is lower than a predetermined temperature and the change in temperature rise is greater than or equal to a predetermined range.

In one embodiment, the control unit may control a low-frequency control signal to be output when the temperature of the outside air is higher than a predetermined temperature and the change in temperature is greater than or equal to a predetermined range.

In one embodiment, the control unit may control a high-frequency control signal to be output when the outdoor temperature is higher than a predetermined temperature and the change in temperature rise is greater than or equal to a predetermined range.

A method for controlling a valve of a fuel cell according to another embodiment of the present invention may include controlling an operation of the valve using a control signal and inducing vibration of the valve by controlling a frequency of the control signal. there is.

In an embodiment, the step of inducing the vibration of the valve by controlling the frequency of the control signal includes selecting a high frequency control signal output from a high frequency generator or a low frequency control signal output from a low frequency generator to reduce the vibration of the valve. Induction may be included.

In one embodiment, the step of inducing the vibration of the valve by controlling the frequency of the control signal causes the high-frequency control signal to be output or the low-frequency control signal to be output based on the external temperature and the temperature change for a predetermined time. It may include a step of controlling to be.

In one embodiment, the step of inducing the vibration of the valve by controlling the frequency of the control signal is the step of controlling the low-frequency control signal to be output when the outdoor temperature is lower than a predetermined temperature and the temperature drop change is greater than or equal to a predetermined range. can include

In one embodiment, the step of inducing the vibration of the valve by controlling the frequency of the control signal is the step of controlling the output of a high-frequency control signal when the outdoor temperature is lower than a predetermined temperature and the change in temperature rise is greater than or equal to a predetermined range. can include

In one embodiment, the step of inducing the vibration of the valve by controlling the frequency of the control signal includes the step of controlling the output of a low-frequency control signal when the outdoor temperature is higher than a predetermined temperature and the temperature drop is greater than or equal to a predetermined range. can include

In one embodiment, the step of inducing the vibration of the valve by controlling the frequency of the control signal includes the step of controlling the high-frequency control signal to be output when the outdoor temperature is higher than a predetermined temperature and the change in temperature is greater than or equal to a predetermined range. can include

This technology changes the PWM control signal for controlling the condensate valve to a low frequency or high frequency, and makes the condensate valve vibrate when controlled with a low frequency so that the condensate does not remain at the valve inlet, thereby preventing freezing of the condensate. Condensate can be smoothly discharged even in the outside air.

In addition to this, various effects identified directly or indirectly through this document may be provided.

1 is a diagram showing a fuel cell system according to an embodiment of the present invention;
2 is a block diagram showing a valve control device for a fuel cell according to an embodiment of the present invention;
3 is a diagram for explaining operating conditions of a valve control device for a fuel cell according to an embodiment of the present invention;
4 is a flowchart illustrating a method for controlling a valve of a fuel cell according to an embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that this is not intended to limit the present invention to the specific embodiments, and includes various modifications, equivalents, and/or alternatives of the embodiments of the present invention.

Various embodiments of this document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutes of the embodiments.

In connection with the description of the drawings, like reference numbers may be used for like or related elements. The singular form of a noun corresponding to an item may include one item or a plurality of items, unless the relevant context clearly dictates otherwise.

In this document, "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "A Each of the phrases such as "at least one of , B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

Terms such as "first", "second", or "first" or "secondary" may simply be used to distinguish a given component from other corresponding components, and may be used to refer to a given component in another aspect (eg, importance or order) is not limited. A (e.g., first) component is said to be "coupled" or "connected" to another (e.g., second) component, with or without the terms "functionally" or "communicatively." When mentioned, it means that the certain component may be connected to the other component directly (eg by wire), wirelessly, or through a third component.

1 is a diagram showing a fuel cell system according to an embodiment of the present invention.

Referring to FIG. 1 , the fuel cell system according to an embodiment of the present invention includes a hydrogen supply unit 110, a fuel cut-off valve (FCV) 120, and a fuel supply valve (FSV). (130), ejector (140, FUEL EJECTOR), storage unit 150, condensate valve 160, fuel cell stack 170, hydrogen purge valve 175, and air humidifier 180 can do.

The hydrogen supply unit 110 supplies hydrogen as a fuel to the fuel cell stack 170 and may include a hydrogen tank (not shown) and a regulator (not shown) in which hydrogen is stored, and a hydrogen supply system extending from the hydrogen tank. Hydrogen may flow to the fuel cell stack 170 along the piping.

The hydrogen tank can store high-pressure hydrogen gas of about 700 bar inside the container.

The regulator can reduce the high-pressure hydrogen stored in the hydrogen tank to about 17 bar, and supply the reduced-pressure hydrogen to the rear end of the regulator.

A hydrogen shutoff valve 120 and a hydrogen supply valve 130 may be provided at a rear end of the regulator along the pipe of the hydrogen supply system.

The hydrogen shutoff valve 120 may be a normally-closed (NC) type valve. The hydrogen shutoff valve 120 may be a valve for blocking hydrogen that may be discharged from the hydrogen tank in an emergency.

The hydrogen supply valve (FSV) 130 may adjust the hydrogen pressure supplied to the fuel cell stack 170 . The hydrogen supply valve 130 may be configured as a solenoid type valve that can be driven by an electromagnet. The hydrogen supply valve 130 may be connected to the fuel cell stack 170 by a pipe formed at a rear end.

The ejector 140 (FUEL EJECTOR) may supply low-pressure hydrogen supplied through the hydrogen supply unit 110 to the fuel cell stack 170 .

The ejector 140 may mix high-temperature and high-humidity hydrogen discharged from the hydrogen electrode and dry hydrogen supplied from the hydrogen supply unit 110 and supply the mixture to the hydrogen electrode.

The hydrogen purge valve 175 may release hydrogen unnecessary for reaction in the fuel cell stack 170 into the atmosphere.

The storage unit 150 may store condensed water. For example, the storage unit 150 may be a water trap (WATER TRAP), and hereinafter, the storage unit 150 will be described assuming that it is a water trap.

The condensate valve 160 is a valve for discharging the condensed water stored in the storage unit 150 to the outside. The condensate valve 160 may be configured as a solenoid-type valve that can be driven by an electromagnet.

The fuel cell stack 170 is capable of generating electricity by using a chemical reaction between hydrogen and oxygen, and includes a membrane electrode assembly (MEA) to which a catalyst electrode layer in which an electrochemical reaction occurs on both sides of an electrolyte membrane is attached, and a membrane It may be composed of an anode stacked on one surface of the electrode assembly and supplied with hydrogen as a fuel, and a cathode stacked on the other surface of the membrane electrode assembly and supplied with oxygen as an oxidizing agent.

The condensed water generated by the electrochemical reaction in the fuel cell stack 170 is generated inside the fuel cell stack 170 and must be smoothly discharged to the outside of the fuel cell stack 170 .

When the condensate is not well discharged from the inside of the fuel cell stack 170, that is, when it is in a flooding state, the supply of hydrogen, which is the fuel, is hindered, and the power generation performance of the fuel cell stack 170 is deteriorated. In serious cases, the fuel cell Damage to the stack 170 may occur.

In order to discharge the condensed water from the hydrogen electrode, the flow rate of the fluid (mixed gas including moisture) inside the fuel cell stack 170 must be increased by increasing the flow rate of hydrogen inside the fuel cell stack 170 .

At this time, the most used is periodic hydrogen purging. That is, when moisture in the fuel cell stack 170 is to be removed, the hydrogen flow rate in the fuel cell stack 170 can be temporarily increased by purging through the condensate valve 160 .

Gas containing hydrogen discharged from the hydrogen electrode may be recycled back to the hydrogen electrode through the ejector 140, and the remainder may be discharged to the outside through the storage unit 150 and the condensate valve 160.

The humidifier 180 may be provided between the air supply line connected to the air electrode and the air discharge line to humidify air supplied to the air electrode along the air supply line.

The humidifier 180 exchanges moisture between air flowing in from the outside in a dry state and flowing along the air supply line and air discharged in a humid state from the air electrode and flowing along the air discharge line to obtain air flowing through the air supply line. can be humidified.

2 is a block diagram showing a valve control device for a fuel cell according to an embodiment of the present invention, and FIG. 3 is a diagram for explaining operating conditions of the valve control device for a fuel cell according to an embodiment of the present invention.

Referring to FIG. 2 , the temperature sensor 161 may measure the outside air temperature and provide the measured temperature to the controller 190 . The temperature sensor 161 may be installed at the rear end of the condensate valve 160 or a discharge pipe at the rear end thereof.

A water level sensor (not shown) may be provided in the storage unit 150 to detect the level of condensed water. The water level sensor may be installed at a predetermined set height of the storage unit 150 . The water level sensor may detect the level of the condensed water stored in the storage unit 150 and provide the detected level to the control unit 190 .

The control unit 190 may control the opening or closing of the condensate valve 160 according to the detection signal provided from the water level sensor. That is, when the condensed water in the storage unit 150 is stored at a predetermined critical level, the water level sensor may detect this and provide the detection signal to the control unit 190 .

The control unit 190 may apply an open signal to the condensate valve 160 when it is determined that condensed water is stored at a predetermined critical level in the storage unit 150 by comparing and analyzing detection signals of the water level sensor.

When the condensate valve 160 is opened, the condensed water stored in the storage unit 150 may be discharged to the outside through the discharge pipe.

A flow sensor 162 may be provided in the condensate valve 160 . The flow sensor 162 may detect the flow of condensed water flowing through the condensate valve 160 .

Accordingly, the control unit 190 may determine that the condensed water is frozen if the flow rate of the condensed water discharged to the open condensate valve 160 is not sensed when the outside air temperature is lower than the predetermined temperature.

For example, when the outdoor temperature is lower than a predetermined temperature and the condensate water in the storage unit 150 exceeds a predetermined critical water level, the condensate valve 160 is opened and the flow of condensate water is sensed through the flow sensor 162. can

At this time, the controller 190 may determine that the condensate is frozen when the flow of the condensate is not detected through the flow sensor 162 .

The heater 163 may be installed at the outlet of the storage unit 150 or in the condensate valve 160 to prevent freezing of the condensed water.

The controller 190 may operate the heater 163 when it is determined that the condensate valve 160 is frozen due to freezing of the condensate.

On the other hand, the controller 190 controls the operation of the condensate valve 160 using a PWM control signal, and controls the frequency of the PWM control signal to induce vibration of the condensate valve 160 while opening or closing the condensate valve 160. Closure can be controlled.

The controller 190 may control the operation of the condensate valve 160 by selecting a high frequency control signal output from the first frequency generator 141 or a low frequency control signal output from the second frequency generator 142 .

The first frequency generator 141 includes a 20 kHz high-frequency MOSFET and can output a PWM control signal having a frequency of 20 kHz.

The second frequency generator 142 includes a 10Hz low-frequency MOSFET and may output a PWM control signal having a frequency of 10Hz.

The control unit 190 determines whether to control the condensate valve 160 or to generate a second frequency by outputting a high-frequency control signal through the first frequency generator 141 based on the current outdoor temperature and the amount of change in the outdoor air temperature for a predetermined time. Vibration may be applied to the condensate valve 60 by selecting whether or not to control the condensate valve 160 by outputting a low-frequency control signal through the unit 142 .

That is, the control unit 190 may selectively and repeatedly apply a high frequency or a low frequency to the condensate valve 160 based on the outside air temperature and the amount of change in the outside air temperature for a predetermined time.

Referring to FIG. 3 , the controller 190 may control a low-frequency control signal of 10 Hz to be output when the outside air temperature is a temperature at which condensate can freeze.

For example, if the outside air temperature is 0 degrees, -10 degrees or -20 degrees, since the condensate flowing through the condensate valve 160 is at a temperature at which it can freeze, a 10Hz control signal is applied to the condensate valve 160 to turn the condensate valve By inducing the vibration of the condensate valve 160, condensate flowing through the condensate valve 160 can be prevented from freezing. Even when the condensate valve 160 is closed, vibration of the condensate valve 160 may be induced so that no residual condensed water remains.

The controller 190 may control a low-frequency control signal of 10 Hz to be output when the outdoor temperature is lower than a predetermined temperature and the temperature drop change is greater than or equal to a predetermined range. In this case, the condensed water flowing through the condensate valve 160 may be frozen when the temperature of the outside air is lower than the predetermined temperature.

Therefore, by controlling the condensate valve 160 with a low-frequency control signal, vibration occurs in the condensate valve 160, so that the condensed water flowing through the condensate valve 160 does not freeze.

For example, in a state where the outside air temperature is -20 degrees, if the temperature drops by 10 degrees or more after a predetermined time, a 10Hz control signal is applied to the condensate valve 160 to induce vibration of the condensate valve 160, thereby inducing the condensate valve 160. ) can be prevented from freezing condensate flowing.

The controller 190 may control a low-frequency control signal of 10 Hz to be output when the outdoor temperature is higher than a predetermined temperature and the temperature drop change is greater than or equal to a predetermined range. In this case, the condensed water flowing through the condensate valve 160 may freeze when the vehicle is in a room where the outside air temperature is higher than a predetermined temperature and moves outside on a cold day and the outside air temperature drops rapidly.

For example, if the vehicle is in a room where the outside temperature is 10 degrees and moves outside on a cold day and the temperature drops by 10 degrees or more, a 10 Hz control signal is applied to the condensate valve 160 to reduce vibration of the condensate valve 160. By inducing, the condensed water flowing through the condensate valve 160 can be prevented from freezing.

On the other hand, the control unit 190 can control the high-frequency control signal of 20 KHz to be output if the outside air temperature is a temperature at which the condensate does not freeze.

For example, if the outdoor temperature is 10 degrees or higher, since the condensate flowing through the condensate valve 160 is at a temperature at which it does not freeze, a 20 KHz control signal may be applied to the condensate valve 160.

The control unit 190 may control a high-frequency control signal of 20 KHz to be output if the outdoor temperature is lower than a predetermined temperature but the change in temperature rise is greater than a predetermined range. At this time, although the outside air temperature is lower than the predetermined temperature, since the temperature is rising, the condensed water flowing through the condensate valve 160 may not freeze.

For example, if the vehicle is outside where the outside air temperature is -20 degrees and moves indoors and the temperature rises by 10 degrees or more after a predetermined time, the condensed water flowing through the condensate valve 160 will not freeze. Therefore, since vibration is not required for the condensate valve 160, a high-frequency control signal may be applied to the condensate valve 160.

The control unit 190 may control a high-frequency control signal of 20 KHz to be output when the outdoor temperature is higher than a predetermined temperature and the change in temperature is greater than or equal to a predetermined range. In this case, the condensate flowing through the condensate valve 160 may not freeze because the temperature of the outside air is higher than the predetermined temperature and the temperature is rising.

For example, if the temperature of the vehicle increases by 10 degrees or more after a predetermined time in a state where the outside air temperature is 10 degrees or more, the condensed water flowing through the condensate valve 160 is not frozen. Therefore, since vibration is not required for the condensate valve 160, a high-frequency control signal may be applied to the condensate valve 160.

In addition, although not shown in the drawings, according to embodiments, the valve control device of the fuel cell may further include a storage means.

The storage unit may store a command for controlling a valve control device of a fuel cell, a control command code, control data, or user data. For example, the storage unit may include at least one of an application program, an operating system (OS), middleware, or a device driver.

The storage unit may include one or more of volatile memory and non-volatile memory.

Volatile memory includes dynamic random access memory (DRAM), static RAM (SRAM), synchronous DRAM (SDRAM), phase-change RAM (PRAM), magnetic RAM (MRAM), resistive RAM (RRAM), and ferroelectric RAM (FeRAM). can include

The nonvolatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, and the like.

The storage means may further include a nonvolatile medium such as a hard disk drive (HDD), a solid state disk (SSD), an embedded multimedia card (eMMC), and a universal flash storage (UFS). can

Hereinafter, a valve control method of a fuel cell according to another embodiment of the present invention will be described in detail with reference to FIG. 4 .

4 is a flowchart illustrating a method for controlling a valve of a fuel cell according to an embodiment of the present invention.

Hereinafter, it is assumed that the valve control device of the fuel cell of FIG. 2 performs the process of FIG. 4 .

First, when the vehicle is started (S201) and the condensate water in the storage unit 150 exceeds a predetermined critical level (S202), the control unit 190 controls the operation of the condensate valve 160 using a PWM control signal, , It is possible to control the opening or closing of the condensate valve 160 while inducing vibration of the condensate valve 160 by controlling the frequency of the PWM control signal.

The controller 190 may control the operation of the condensate valve 160 by selecting a high frequency control signal output from the first frequency generator 141 or a low frequency control signal output from the second frequency generator 142 .

The control unit 190 determines whether to control the condensate valve 160 or to generate a second frequency by outputting a high-frequency control signal through the first frequency generator 141 based on the current outdoor temperature and the amount of change in the outdoor air temperature for a predetermined time. Vibration may be applied to the condensate valve 60 by selecting whether or not to control the condensate valve 160 by outputting a low-frequency control signal through the unit 142 (S203).

That is, the control unit 190 may selectively and repeatedly apply a high frequency or a low frequency to the condensate valve 160 based on the outside air temperature and the amount of change in the outside air temperature for a predetermined time.

Subsequently, if the flow rate of the condensate discharged through the opened condensate valve 160 is not detected by the flow sensor 162 (S204), it can be determined that the condensate is frozen (S205).

When the controller 190 determines that the condensate valve 160 is frozen due to freezing of the condensate, the heater 163 may be operated (S206).

Various embodiments of the present document may be implemented as software (eg, a program) including one or more instructions stored in a storage medium (eg, internal memory or external memory) readable by a machine. For example, the device may call at least one command among one or more commands stored from a storage medium and execute it. This enables the device to be operated to perform at least one function according to the at least one command invoked. The one or more instructions may include code generated by a compiler or code executable by an interpreter.

The device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-temporary' only means that the storage medium is a tangible device and does not contain a signal (e.g. electromagnetic wave), and this term refers to the case where data is stored semi-permanently in the storage medium. It does not discriminate when it is temporarily stored.

According to one embodiment, the method according to various embodiments disclosed in this document may be included and provided in a computer program product. Computer program products may be traded between sellers and buyers as commodities. A computer program product is distributed in the form of a machine-readable storage medium (e.g. compact disc read only memory (CD-ROM)), or distributed online (e.g. via an application store or directly between two user devices). : can be downloaded or uploaded). In the case of online distribution, at least part of the computer program product may be temporarily stored or temporarily created in a device-readable storage medium such as a manufacturer's server, an application store server, or a relay server's memory.

According to various embodiments, each component (eg, module or program) of the components described above may include a single object or a plurality of objects, and some of the multiple objects may be separately disposed in other components. .

According to various embodiments, one or more components or operations among the aforementioned components may be omitted, or one or more other components or operations may be added.

Alternatively or additionally, a plurality of components (eg modules or programs) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by a corresponding component of the plurality of components prior to the integration. .

According to various embodiments, operations performed by modules, programs, or other components are executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations are executed in a different order, omitted, or , or one or more other operations may be added.

As described above, according to the present invention, while changing the PWM control signal for controlling the condensate valve to a low frequency or high frequency, the condensate valve vibrates when controlled at a low frequency so that the condensate does not remain at the valve inlet, thereby preventing freezing of the condensate. Accordingly, condensed water can be smoothly discharged even in sub-zero outdoor air.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

Claims (14)

a storage unit for storing condensed water generated in the fuel cell stack;
a valve installed at the outlet of the storage unit to discharge the condensed water; and
A controller that controls the operation of the valve using a control signal and induces vibration of the valve by controlling the frequency of the control signal.
A valve control device for a fuel cell comprising a. The method of claim 1,
The control unit,
A valve control device for a fuel cell, characterized in that inducing vibration of the valve by selecting a high frequency control signal output from a high frequency generator or a low frequency control signal output from a low frequency generator. The method of claim 2,
The control unit,
A valve control device for a fuel cell, characterized in that the high-frequency control signal is output or the low-frequency control signal is output based on the external temperature and the amount of temperature change for a predetermined time. The method of claim 3,
The control unit,
A valve control device for a fuel cell characterized in that the control is performed so that a low-frequency control signal is output when the outdoor temperature is lower than a predetermined temperature and the temperature drop change is greater than a predetermined range. The method of claim 3,
The control unit,
A valve control device for a fuel cell, characterized in that, when the outdoor temperature is lower than a predetermined temperature and the change in temperature is greater than or equal to a predetermined range, a high-frequency control signal is output. The method of claim 3,
The control unit,
A valve control device for a fuel cell characterized in that the control is performed so that a low-frequency control signal is output when the outdoor temperature is higher than a predetermined temperature and the temperature drop change is greater than a predetermined range. The method of claim 3,
The control unit,
A valve control device for a fuel cell, characterized in that, when the outdoor temperature is higher than a predetermined temperature and the change in temperature is greater than a predetermined range, a high-frequency control signal is output. controlling the operation of the valve using a control signal; and
Inducing vibration of the valve by controlling the frequency of the control signal
A valve control method of a fuel cell comprising a. The method of claim 8,
Inducing the vibration of the valve by controlling the frequency of the control signal,
A valve control method for a fuel cell, comprising selecting a high frequency control signal output from a high frequency generator or a low frequency control signal output from a low frequency generator to induce vibration of the valve. The method of claim 9,
Inducing the vibration of the valve by controlling the frequency of the control signal,
A method of controlling a valve of a fuel cell, comprising controlling output of the high-frequency control signal or output of the low-frequency control signal based on an external temperature and a temperature change for a predetermined time. The method of claim 10,
Inducing the vibration of the valve by controlling the frequency of the control signal,
A method of controlling a valve of a fuel cell, comprising: controlling a low-frequency control signal to be output if the temperature of the outside air is lower than the predetermined temperature and the change in temperature is greater than or equal to a predetermined range. The method of claim 10,
Inducing the vibration of the valve by controlling the frequency of the control signal,
A method of controlling a valve of a fuel cell, comprising controlling a high-frequency control signal to be output when the temperature of the outside air is lower than a predetermined temperature and the change in temperature is greater than a predetermined range. The method of claim 10,
Inducing the vibration of the valve by controlling the frequency of the control signal,
A method of controlling a valve of a fuel cell, comprising: controlling a low-frequency control signal to be output when the temperature of the outside air is higher than a predetermined temperature and the change in temperature is greater than or equal to a predetermined range. The method of claim 10,
Inducing the vibration of the valve by controlling the frequency of the control signal,
A method of controlling a valve of a fuel cell, comprising controlling a high-frequency control signal to be output when the temperature of the outside air is higher than a predetermined temperature and the change in temperature rise is greater than a predetermined range.

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