Method for controlling temperature of fuel cell stack according to cooling fan control

Abstract

The present invention relates to a method for controlling the temperature of a fuel cell stack according to cooling fan control and, more specifically, to a method for controlling the temperature of a fuel cell stack according to cooling fan control, the method comprising: a step of applying power to peripheral devices of the fuel cell stack; and a cooling fan control step of controlling the cooling fan by selecting one from among a fuel cell stack power generation preparation step, a fuel cell stack power generation start step, a temperature monitoring step, a first cooling fan minimum rotation control step of controlling, at a first minimum rotation, the cooling fan, which is one of the peripheral devices, a first cooling fan linear control step of controlling, to be at a first linear slope, the cooling fan, and a first cooling fan PID control step of performing first PID control on the cooling fan.

Description

Temperature control method of a fuel cell stack based on cooling fan control

[0001] The present invention relates to a method for controlling the temperature of a fuel cell stack by controlling a cooling fan, and more specifically, to a method for controlling the temperature of a fuel cell stack by controlling a cooling fan, which is one of the peripheral devices of the fuel cell stack, by selecting one of a first cooling fan minimum rotation control step that controls the cooling fan to a first minimum rotation based on a comparison result between a fuel cell stack control value of the fuel cell stack and a first temperature associated with the fuel cell stack, a first cooling fan linear control step that controls the cooling fan to a first linear slope, and a first cooling fan PID control step that controls the cooling fan by a first PID control, thereby controlling the cooling fan to control the temperature of the fuel cell stack.

[0002] Fuel cells, which are power generation devices that convert chemical energy generated by oxidizing fuel into electrical energy, are classified into solid oxide fuel cells, molten carbonate fuel cells, and polymer electrolyte membrane fuel cells depending on the type of electrolyte.

[0003] Among these fuel cells, a Polymer Electrolyte Membrane Fuel Cell (PEMFC) comprises a membrane electrode assembly (MEA) having a catalytic electrode layer equipped with an anode and a cathode centered around an electrolyte membrane permeable to hydrogen ions, a gas diffusion layer (GDL) that evenly distributes reaction gases, and a bipolar plate that supplies reaction gases to the gas diffusion layer and discharges generated water.

[0004] In the membrane electrode assembly (MEA) of a fuel cell, fuel is oxidized to produce electrical energy, and heat is generated during the process of producing electrical energy.

[0005] An air-cooled fuel cell cooling method is known in which the heat generated in the fuel cell is cooled by air-cooling the fuel cell by passing air through a cooling plate using a cooling fan.

[0006] Specifically, conventionally, the fuel cell was cooled by air cooling using cooling fan rotation speed increase / decrease control based on a comparison between a preset fuel cell target temperature and the cooling air outlet temperature, cooling fan linear control, or cooling fan PID control (Proportional-Integral-Differential control).

[0007] However, according to the conventional air-cooled fuel cell cooling method, the fuel cell is cooled without considering the external environment (external temperature, load conditions, etc.) during fuel cell power generation, so there was a problem in that the fuel cell was overcooled or overheated when the fuel cell was operated at low or high external temperatures or under low or high load conditions, which degraded the performance of the fuel cell.

[0008] [Prior Art Literature]

[0009] [Patent Literature]

[0010] (Patent Document 1): JP 6774996 (Registered Oct. 07, 2020)

[0011] (Patent Document 2): KR 2019-0067629 (Published June 17, 2019)

[0012] The present invention has been devised to solve the above-mentioned problems, and the present invention is intended to provide a method for controlling the temperature of a fuel cell stack by controlling a cooling fan capable of cooling the fuel cell according to external temperature or fuel cell load conditions.

[0013] The problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below.

[0014] A method for controlling the temperature of a fuel cell stack according to a cooling fan control according to an embodiment of the present invention may include: a fuel cell stack power generation preparation step comprising a step of applying power to peripheral devices of the fuel cell stack and a fuel cell stack control value setting step in which a fuel cell stack control value of the fuel cell stack is set; a fuel cell stack power generation start step after the fuel cell stack power generation preparation step, a fuel cell stack power generation start step in which power generation of the fuel cell stack is started; a temperature monitoring step after the fuel cell stack power generation start step, comprising a step of monitoring a first temperature associated with the fuel cell stack; a control value and temperature comparison step after the temperature monitoring step, comprising a step of comparing a fuel cell stack control value with a first temperature associated with the fuel cell stack; and a first cooling fan minimum rotation control step after the control value and temperature comparison step in which, according to the result of comparing the fuel cell stack control value and the first temperature, one of the cooling fan is controlled to a first minimum rotation, a first cooling fan linear control step in which the cooling fan is controlled to a first linear slope, and a first cooling fan PID control step in which the cooling fan is controlled by a first PID control.

[0015] In addition, the fuel cell stack control value is the cooling fan linear control temperature range (T CPL ), the target temperature of the fuel cell stack during power generation, which is the target temperature of the fuel cell stack (T ST ), target external temperature of the fuel cell stack (OT) ST ), fuel cell stack target temperature (T ST Fuel cell stack power generation target time (F) according to ) GTT ) and fuel cell stack target temperature (T ST Fuel cell stack target current (S) according to ) AT Includes ), and the first temperature associated with the fuel cell stack is the cooling air outlet temperature (T) of the cooling air discharged from the fuel cell stack. S ) and current external temperature of the fuel cell stack measured outside the fuel cell stack (OT SIt may include ).

[0016] In addition, the control value and temperature comparison step is the cooling air outlet temperature (T S ) and cooling fan linear control temperature range (T CPL Linear control temperature (T) within ) CL A first temperature comparison step comparing ) and cooling air outlet temperature (T S ), fuel cell stack target temperature (T ST ) and linearly controlled temperature (T CL It may include a second temperature comparison step that compares ).

[0017] In addition, in the first temperature comparison step, the cooling air outlet temperature (T S ) is the linearly controlled temperature (T CL If compared to being less than ), the first cooling fan minimum rotation control step may be selected in the cooling fan control step.

[0018] In addition, in the first temperature comparison step, the cooling air outlet temperature (T S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step, the fuel cell stack target temperature (T ST ) is the cooling air outlet temperature (T S If compared to exceed ), the first cooling fan linear control step may be selected in the cooling fan control step.

[0019] In addition, in the first temperature comparison step, the cooling air outlet temperature (T S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step, the cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST If compared to be greater than ) the first cooling fan PID control step can be selected in the cooling fan control step.

[0020] In addition, the control value and temperature comparison step is the fuel cell stack power generation time (F), which is the current power generation continuation time of the fuel cell stack. GT ) and fuel cell stack power generation target time (FGTT Compare ) and cooling air outlet temperature (T S ) and fuel cell stack target temperature (T ST The method further includes a first power generation time and temperature comparison step for comparing ), and the cooling fan control step may further include a second cooling fan PID control step for controlling the cooling fan with a second PID control and a second cooling fan minimum rotation control step for controlling the cooling fan with a second minimum rotation.

[0021] In addition, in the first temperature comparison step, the cooling air outlet temperature (T S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step, the cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST It is compared as being greater than ), and in the first power generation time and temperature comparison step conducted after a certain period of time has elapsed following the second temperature comparison step, the fuel cell stack power generation time (F GT ) is the fuel cell stack power generation target time (F GTT Exceeding ) and cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST If compared to be greater than ) the second cooling fan PID control step can be selected in the cooling plate control step.

[0022] In addition, in the first temperature comparison step, the cooling air outlet temperature (T S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step, the cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST It is compared as being greater than ), and in the first power generation time and temperature comparison step conducted after a certain period of time has elapsed following the second temperature comparison step, the fuel cell stack power generation time (F GT ) is the fuel cell stack power generation target time (F GTT Exceeding ) and cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T STIf compared to being less than ), the second cooling plate minimum rotation control can be selected in the cooling plate control step.

[0023] In addition, the control value and temperature comparison step is the fuel cell stack measured current (S) according to the power generation of the fuel cell stack. A ) and fuel cell stack target current (S AT Compare ) and cooling air outlet temperature (T S ) and fuel cell stack target temperature (T ST The method further includes a first generation current and temperature comparison step for comparing ), and the cooling fan control step may further include a third cooling fan PID control step for controlling the cooling fan with third PID control and a third cooling fan minimum rotation control step for controlling the cooling fan with third minimum rotation.

[0024] In addition, in the first temperature comparison step, the cooling air outlet temperature (T S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step, the cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST It is compared as being greater than ), and in the first generation current and temperature comparison step conducted after a certain period of time has elapsed following the second temperature comparison step, the fuel cell stack measured current (S A ) is the fuel cell stack target current (S AT Exceeding ) and cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST If compared to be greater than ), the third cooling fan PID control step can be selected in the cooling plate control step.

[0025] In addition, in the first temperature comparison step, the cooling air outlet temperature (T S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step, the cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T STIt is compared as being greater than ), and in the first generation current and temperature comparison step conducted after a certain period of time has elapsed following the second temperature comparison step, the fuel cell stack measured current (S A ) is the fuel cell stack target current (S AT Exceeding ) and cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST If compared to being less than ), the third cooling plate minimum rotation control can be selected in the cooling plate control step.

[0026] In addition, the control value and temperature comparison step is the fuel cell stack target external temperature (OT). ST ) and fuel cell stack current external temperature (OT S The method further includes a first fuel cell stack external temperature comparison step that compares ), and the cooling fan control step may further include a second cooling fan linear control step that controls the cooling fan with a second linear slope smaller than the first linear slope.

[0027] In addition, in the first temperature comparison step, the cooling air outlet temperature (T S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step, the fuel cell stack target temperature (T ST ) is the cooling air outlet temperature (T S It is compared to exceed ), and in the first fuel cell stack external temperature comparison step, the current external temperature of the fuel cell stack (OT S ) is the fuel cell stack target external temperature (OT ST In the case where it is compared to be less than ), the second linear control step may be selected in the cooling fan control step.

[0028] According to a method for controlling the temperature of a fuel cell stack by controlling a cooling fan according to an embodiment of the present invention, a first cooling fan minimum rotation control (FAN) is performed according to the result of comparing the control value and the temperature according to the present embodiment. MIN1), since the cooling fan (2) can be controlled by selecting one of the first cooling fan linear control (CPL1) and the first cooling fan PID control (PID1), the fuel cell stack (1) can be prevented from being overcooled or overheated, thereby mitigating the voltage drop of the fuel cell stack (1) and reducing the power consumption required to operate the cooling fan (2) as the cooling fan (2) operates efficiently.

[0029] In addition, according to the method for controlling the temperature of a fuel cell stack by controlling a cooling fan according to one embodiment of the present invention, the fuel cell stack power generation time (F) according to the present embodiment GT ) and fuel cell stack power generation target time (F GTT Comparison results of ) and cooling air outlet temperature (T S ) and fuel cell stack target temperature (T ST Since the cooling fan (2) can be controlled by selecting one of the second cooling fan minimum rotation control and the second cooling fan PID control steps based on the comparison result of ), the fuel cell stack (1) can be prevented from being overcooled or overheated, thereby mitigating the voltage reduction of the fuel cell stack (1) and reducing the power consumption required for the operation of the cooling fan (2) as the cooling fan (2) is operated efficiently.

[0030] In addition, according to the method for controlling the temperature of a fuel cell stack by controlling a cooling fan according to one embodiment of the present invention, the fuel cell stack measured current (S) according to this embodiment A ) and fuel cell stack target current (S AT Comparison results of ) and cooling air outlet temperature (T S ) and fuel cell stack target temperature (T ST Since the cooling fan (2) can be controlled by selecting one of the third cooling fan minimum rotation control and third cooling fan PID control steps based on the comparison result of ), the fuel cell stack (1) can be prevented from being overcooled or overheated, thereby mitigating the voltage reduction of the fuel cell stack (1) and reducing the power consumption required for the operation of the cooling fan (2) as the cooling fan (2) is operated efficiently.

[0031] In addition, according to the method for controlling the temperature of a fuel cell stack by controlling a cooling fan according to one embodiment of the present invention, the current external temperature (OT) of the fuel cell stack according to this embodiment S ) and fuel cell stack target external temperature (OT ST Since the second linear control step is selected based on the comparison result of ) to control the cooling fan (2), the current external temperature (OT) of the fuel cell stack is controlled. S By preventing the fuel cell stack (1) from being overcooled or overheated, the voltage reduction of the fuel cell stack (1) can be mitigated, and as the cooling fan (2) operates efficiently, the power consumption required for operating the cooling fan (2) can be reduced.

[0032] FIG. 1 is a block diagram schematically showing a fuel cell stack and peripheral devices according to one embodiment of the present invention.

[0033] FIG. 2 is a flowchart illustrating a method for controlling the temperature of a fuel cell stack according to cooling fan control according to an embodiment of the present invention.

[0034] Figure 3 is a flowchart showing in detail the fuel cell stack power generation preparation steps of Figure 1.

[0035] FIG. 4 is a flowchart illustrating a method for controlling the temperature of a fuel cell stack according to cooling fan control according to a first embodiment of the present invention.

[0036] Figure 5 is a graph showing the temperature control method of a fuel cell stack according to the cooling fan control of Figure 4.

[0037] FIG. 6 is a flowchart illustrating a method for controlling the temperature of a fuel cell stack according to cooling fan control according to a second embodiment of the present invention.

[0038] FIG. 7 is a flowchart illustrating a method for controlling the temperature of a fuel cell stack according to cooling fan control according to a third embodiment of the present invention.

[0039] FIG. 8 is a flowchart illustrating a method for controlling the temperature of a fuel cell stack according to cooling fan control according to the fourth embodiment of the present invention.

[0040] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms.

[0041] Hereinafter, the technical features of the present invention will be specifically described with reference to the attached drawings.

[0042] FIG. 1 is a block diagram schematically showing a fuel cell stack and peripheral devices according to one embodiment of the present invention. FIG. 2 is a flowchart showing a method (10) for controlling the temperature of a fuel cell stack by controlling a cooling fan according to one embodiment of the present invention, and FIG. 3 is a flowchart showing in detail the preparation steps for power generation of the fuel cell stack of FIG. 1.

[0043] Referring to FIG. 1, the fuel cell stack (1) according to the present embodiment may be connected to peripheral devices including a cooling fan (2), an outlet temperature sensor (3), an external temperature sensor (4), an air blower (5), a hydrogen supply device (6), a hydrogen purge valve (7), and an air discharge valve (8), and the control unit (9) may be connected to the fuel cell stack (1) and peripheral devices to control the fuel cell stack (1) and peripheral devices.

[0044] Here, according to the present embodiment, when air (AIR) is supplied to the fuel cell stack (1) by an air blower (5) and hydrogen (H2) is supplied to the fuel cell stack (1) by a hydrogen supply device (6), the fuel is oxidized in the membrane electrode assembly (MEA) to produce electrical energy, and heat may be generated in the fuel cell stack (1) during the process of producing electrical energy.

[0045] In addition, according to the present embodiment, the fuel cell stack (1) heated by the generated heat can be cooled by cooling air introduced into the cooling plate (not shown) of the fuel cell stack (1) by the operation of the cooling fan (2).

[0046] Referring to FIG. 2, the temperature control method (10) of a fuel cell stack according to the present embodiment by cooling fan control may include a fuel cell stack power generation preparation step (S10), a fuel cell stack power generation start step (S20), a temperature monitoring step (S30), a control value and temperature comparison step (S40), and a cooling plate control step (S50).

[0047] Here, the fuel cell stack power generation preparation step (S10) according to the present embodiment may include a fuel cell stack peripheral device power application step (S11), a fuel cell stack control value setting step (S12), a fuel cell stack and peripheral device normal status determination step (S13), and a load relay on step (S14).

[0048] In the power application step (S11) for the fuel cell stack peripheral device according to the present embodiment, a power switch (not shown) is turned on so that power is supplied to the peripheral device including the cooling fan (2), outlet temperature sensor (3), external temperature sensor (4), air blower (5), hydrogen supply device (6), and hydrogen purge valve (7), and then the peripheral device such as the cooling fan (2) can be initialized.

[0049] In addition, the fuel cell stack control value setting step (S12) according to the present embodiment may be performed after power is supplied to the peripheral device in the fuel cell stack peripheral device power application step (S11).

[0050] In detail, in the fuel cell stack control value setting step (S12) according to the present embodiment, a fuel cell stack operation control value, a cooling fan operation control value, an air blower operation control value, a purge valve operation control value, a hydrogen supply device operation control value, and an air discharge valve operation control value may be set.

[0051] Here, the cooling fan operation control value, the air blower operation control value, the purge valve operation control value, the hydrogen supply device operation control value, and the air discharge valve operation control value are pre-set according to the control method of the fuel cell stack (1) and stored in the control unit (9), and when power is applied to the peripheral device, the control unit (9) can assign a corresponding operation control value to each peripheral device.

[0052] After the fuel cell stack control value setting step (S12) according to the present embodiment, a step for determining whether the fuel cell stack and peripheral devices are normal (S13) may be performed.

[0053] In detail, in the step (S13) for determining whether the fuel cell stack and peripheral devices are normal according to the present embodiment, power is supplied to the peripheral devices and an operation control value is set for each peripheral device, after which each peripheral device can be initialized by the control unit (9), and after each peripheral device is initialized, the normality of each peripheral device can be determined by the control unit (9).

[0054] For example, according to the present embodiment, after power is supplied to the cooling fan (2) to operate it, if the temperature difference between the outlet temperature sensor (3) before operation and the outlet temperature sensor (3) after operation, which is the difference between the temperature before operation and the temperature after operation, is greater than or equal to the temperature control value of the outlet temperature sensor (3) before operation, which is one of the cooling fan operation control values, then the cooling fan (2) can be determined to be operating normally.

[0055] However, if the temperature difference between the outlet temperature sensor (3) before and after the cooling fan operation is less than the temperature control value of the outlet temperature sensor (3) before and after the cooling fan operation, which is one of the cooling fan operation control values, it is determined that the cooling fan (2) is operating abnormally, and the fuel cell stack power generation preparation stage (10) may be stopped in an emergency.

[0056] In addition, according to the present embodiment, if the open-circuit voltage (OCV) of the fuel cell stack (1) is greater than or equal to the fuel cell stack open-circuit voltage value, which is one of the fuel cell stack operation control values, the fuel cell stack (1) can be determined to be normal.

[0057] However, if the open-circuit voltage (OCV) of the fuel cell stack (1) is less than the fuel cell stack open-circuit voltage value, which is one of the fuel cell stack operation control values, the fuel cell stack (1) is determined to be abnormal and the fuel cell stack power generation preparation stage (10) may be stopped in an emergency.

[0058] In the load relay on step according to the present embodiment, the process proceeds after the fuel cell stack and peripheral device normal status determination step (S13), and the load relay can be turned on only when the fuel cell stack (1) is determined to be normal so that a load is applied to the fuel cell stack (1).

[0059] Hereinafter, a method for controlling the temperature of a fuel cell stack according to a cooling fan control mechanism according to one embodiment of the present invention will be described in detail.

[0060] FIG. 4 is a flowchart showing a method for controlling the temperature of a fuel cell stack according to cooling fan control according to a first embodiment of the present invention, and FIG. 5 is a graph showing a method for controlling the temperature of a fuel cell stack according to cooling fan control of FIG. 4.

[0061] Referring to FIG. 4, the temperature control method (100) of a fuel cell stack according to a first embodiment of the present invention, which controls a cooling fan, may include a fuel cell stack power generation preparation step (S110), a fuel cell stack power generation start step (S120), a temperature monitoring step (S130), a control value and temperature comparison step (S140), and a cooling fan control step (S150).

[0062] The fuel cell stack power generation preparation step (S110), fuel cell stack power generation start step (S120), and temperature monitoring step (S130) of the method for controlling the temperature of a fuel cell stack by controlling a cooling fan according to the present embodiment are identical to the fuel cell stack power generation preparation step (S10), fuel cell stack power generation start step (S20), and temperature monitoring step (S30) of the method for controlling the temperature of a fuel cell stack by controlling a cooling fan described above, so a detailed description thereof is omitted.

[0063] The control value and temperature comparison step (S140) according to the present embodiment is the cooling air outlet temperature (T S ) and cooling fan linear control temperature range (T CPL Linear control temperature (T) within ) CL A first temperature comparison step (S141) comparing ) and a cooling air outlet temperature (T S ), fuel cell stack target temperature (T ST ) and linearly controlled temperature (T CL It may include a second temperature comparison step (S142) that compares ).

[0064] The control value and temperature comparison step (S140) according to the present embodiment is performed after the temperature monitoring step (S130), and can compare the fuel cell stack control value with the first temperature associated with the fuel cell stack monitored in the temperature monitoring step (S130).

[0065] Here, the fuel cell stack control value according to the present embodiment is the cooling fan linear control temperature range (T CPL ), the target temperature of the fuel cell stack during power generation, which is the target temperature of the fuel cell stack (T ST ), target external temperature of the fuel cell stack (OT) ST ), fuel cell stack target temperature (T ST Fuel cell stack power generation target time (F) according to ) GTT ) and fuel cell stack target temperature (T ST Fuel cell stack target current (S) according to ) AT It may include ).

[0066] The fuel cell stack control value according to the present embodiment is pre-set according to the control method of the fuel cell stack (1) and stored in the control unit (9), and when power is applied to the peripheral device, the control unit (9) can assign a corresponding operation control value to each peripheral device.

[0067] In addition, the first temperature associated with the fuel cell stack (1) according to the present embodiment is the cooling air outlet temperature (T) of the cooling air discharged from the fuel cell stack. S ) and current external temperature of the fuel cell stack measured outside the fuel cell stack (OT S It may include ).

[0068] Here, the cooling air outlet temperature (T) according to the present embodiment S ) can be measured in real time during operation of the fuel cell stack (1) by an outlet temperature sensor (3) installed at the cooling air outlet of the fuel cell stack (1) and transmitted to the control unit (9), and the cooling air outlet temperature (T) according to the present embodiment S ) The current temperature of the fuel cell stack (1) in operation may be the same temperature.

[0069] In addition, the current external temperature (OT) of the fuel cell stack according to the present embodiment S ) can be measured in real time during operation of the fuel cell stack (1) by an external temperature sensor (4) installed at the cooling air inlet of the fuel cell stack (1) and transmitted to the control unit (9).

[0070] The cooling plate control step (S150) according to the present embodiment proceeds after the control value and temperature comparison step (S140), and in the control value and temperature comparison step (S140), depending on the result of comparing the fuel cell stack control value and the first temperature, the cooling fan, which is one of the peripheral devices, rotates at the first minimum rotation (FAN MIN1The cooling fan can be controlled by selecting one of the following: a first cooling fan minimum rotation control step (S151) that controls the cooling fan with a first linear slope (S152) and a first cooling fan PID control step (S153) that controls the cooling fan with a first PID.

[0071] In addition, the control value and temperature comparison step (S140) according to the present embodiment is the cooling air outlet temperature (T S ) and cooling fan linear control temperature range (T CPL Linear control temperature (T) within ) CL A first temperature comparison step (S141) comparing ) and a cooling air outlet temperature (T S ), fuel cell stack target temperature (T ST ) and cooling fan linear control temperature range (T CPL Linear control temperature (T) within ) CL It may include a second temperature comparison step (S142) that compares ).

[0072] Additionally, the cooling fan control step (S150) according to the present embodiment may include a first cooling fan minimum rotation control step (S151), a first cooling fan linear control step (S152), and a first cooling fan PID control step (S153).

[0073] As illustrated in FIG. 4, the first control information (C) related to the first cooling fan minimum rotation control step (S151) according to the present embodiment I1 ), second control information (C) related to the first cooling fan linear control step (S152) I2 ) and third control information (C) related to the first cooling fan PID control step (S153) I3 ) can be transmitted to the control unit (9) and used to control the cooling fan (2).

[0074] In the cooling fan control step (S150) according to the present embodiment, the cooling air outlet temperature (T) in the first temperature comparison step (S141) S ) is the cooling fan linear control temperature range((T CPL Linear control temperature (T) within ) CLIf compared to being less than ), the first cooling fan minimum rotation control step (S151) may be selected in the cooling fan control step (S150).

[0075] Here, the cooling air outlet temperature (T S ) is the air temperature at which the air introduced through the cooling air inlet of the fuel cell stack (1) passes through the cooling plate (not shown) of the fuel cell stack (1) and absorbs the heat generated in the fuel cell stack (1), and may be the same as the operating temperature of the fuel cell stack (1).

[0076] In addition, the linear control temperature range (T) of the cooling fan according to the present embodiment CPL ) can be formed as a linear temperature increase section formed as the rotational speed of the cooling fan increases linearly at a constant slope until the fuel cell stack (1) reaches a constant temperature.

[0077] In addition, the linear control temperature range (T) of the cooling fan according to the present embodiment CPL The linear slope of ) and the linear temperature increase section according to it can be pre-set according to the control method of the fuel cell stack (1) according to the specifications of the fuel cell stack (1), such as maximum power generation, and can be stored in the control unit (9).

[0078] Referring to FIG. 5, when power is applied to the fuel cell stack peripherals during the fuel cell stack power generation preparation stage (S110), the cooling fan (2) is operated to perform an initial rotation (FAN DS ) and after the initial rotation, the cooling fan (2) is in a preset cooling fan linear control temperature range (T CPL Cooling fan duty (FAN) that increases along a constant slope D The control unit (9) can be set so that the rotational speed of the cooling fan (2) increases in proportion to ).

[0079] As shown in FIG. 5, according to the present embodiment, the cooling fan linear control temperature range (T CPL Linear control temperature (T) within ) CL In response to ), the cooling fan duty (FAN DThe rotational speed of the cooling fan (2) can be increased linearly in correspondence with ).

[0080] According to the present embodiment, in the first temperature comparison step (S141), the cooling air outlet temperature (T S ) is the cooling fan linear control temperature range (T CPL Linear control temperature (T) within ) CL If compared to being less than ), the temperature of the fuel cell stack (1) may be determined to be less than the preset optimal operating temperature.

[0081] At this time, in the cooling fan control step (S150) according to the present embodiment, the cooling fan (2) can be rotated to the first minimum by the control unit (9) to raise the temperature of the fuel cell stack (1).

[0082] For example, as illustrated in FIG. 5, after the fuel cell stack (1) according to the present embodiment is operated for a first time (T1), the cooling air outlet temperature (T S The first cooling air outlet temperature (T) S 1) is the linear control temperature range (T CPL The first linear control temperature (T) within ) CL 1) If compared to be less than, cooling fan duty (FAN D ) 1st cooling fan duty (FAN D 1) The first minimum cooling fan duty (FAN MIND 1) Reduce the cooling fan (2) to the first minimum cooling fan duty (FAN MIND It can be rotated with the first minimum rotation corresponding to 1).

[0083] Here, the first minimum cooling fan duty (FAN) according to the present embodiment MIND 1) is the linear control temperature range (T CPL The first cooling fan outlet temperature (T) within ) S 1) and the same linear control temperature (T CL Cooling fan duty corresponding to ) (FAN D It can be.

[0084] In addition, the first minimum cooling fan duty (FAN) according to the present embodimentMIND The first minimum rotation of the cooling fan (2) corresponding to 1) is the cooling air outlet temperature (T S The second cooling air outlet temperature (T) S 2) is the linear control temperature range (T CPL The second linear control temperature (T) within ) CL It can proceed from the first time (T1) to the second time (T2) until it becomes the same as 2) (see A2 in Fig. 5).

[0085] In addition, according to the present embodiment, the cooling air outlet temperature (T S The second cooling air outlet temperature (T) S 2) is the linear control temperature range (T CPL The second linear control temperature (T) within ) CL After becoming the same as 2), the cooling fan duty (FAN) of the cooling fan (2) D ) at the third time (T3) the linear control temperature interval (T CPL The second linear control temperature (T) within ) CL 2) The second cooling fan duty (FAN D 2) Increase the cooling fan (2) to the second cooling fan duty (FAN D It can be rotated at a rotational speed corresponding to 2).

[0086] Here, also, according to the present embodiment, cooling fan duty (FAN D ) is the first minimum cooling fan duty (FAN MIND 1) If the cooling fan (2) is rotated at a rotational speed higher than the first minimum rotational speed, the temperature of the fuel cell stack (1) may be lowered below the set temperature, and the fuel cell stack (1) may be supercooled.

[0087] In addition, the cooling fan duty (FAN) according to the present embodiment D ) is the first minimum cooling fan duty (FAN MIND 1) If the cooling fan (2) is rotated at a rotational speed lower than the first minimum rotational speed, the temperature of the fuel cell stack (1) may rise above the set temperature and the fuel cell stack (1) may overheat.

[0088] Ultimately, according to the method (100) for controlling the temperature of a fuel cell stack by controlling a cooling fan according to the present embodiment, by controlling the minimum rotation of the first cooling fan, the temperature of the fuel cell stack (1) is lower than the set temperature and thus the fuel cell stack (1) is not supercooled, or the temperature of the fuel cell stack (1) is higher than the set temperature and thus the fuel cell stack (1) is not overheated, so that the temperature of the fuel cell stack (1) can be maintained at an appropriate temperature suitable for power generation.

[0089] In addition, in the first temperature comparison step (S141) according to the present embodiment, the cooling air outlet temperature (T S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step (S142), the fuel cell stack target temperature (T ST ) is the cooling air outlet temperature (T S Exceeding ), cooling air outlet temperature (T S ) is the linearly controlled temperature (T CL If compared to be greater than ) the first cooling fan linear control step (S151) may be selected in the cooling fan control step.

[0090] For example, as shown in FIG. 5, the cooling air outlet temperature (T) at the second time (T2) S The second cooling air outlet temperature (T) S 2) is the linearly controlled temperature (T CL The second linear control temperature (T) CL 2) Above and fuel cell stack target temperature (T ST ) is the second cooling air outlet temperature (T S If it exceeds 2), the first cooling fan linear control (CPL1) is selected, and the linear control temperature range (T CPL The rotational speed of the cooling fan (2) can be linearly controlled along )

[0091] In addition, according to the present embodiment, in the first temperature comparison step (S141), the cooling air outlet temperature (T S ) is the linearly controlled temperature (T CLIt is compared to be greater than ), and in the second temperature comparison step (S142), the cooling air outlet temperature (T S ) is the above fuel cell stack target temperature (T ST If compared to be greater than ), the first cooling fan PID control step (S153) may be selected in the cooling fan control step (S150).

[0092] For example, as shown in FIG. 5, the cooling air outlet temperature (T) after the fourth time (T4) S ) is the linearly controlled temperature (T CL ) or higher and cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST If the above, the first cooling fan PID control (PID1) is selected so that the rotational speed of the cooling fan (2) can be PID controlled.

[0093] Ultimately, according to the method (100) for controlling the temperature of a fuel cell stack by controlling a cooling fan according to the present embodiment, the first cooling fan minimum rotation control (FAN) according to the result of comparing the control value and the temperature according to the present embodiment. MIN 1), since the cooling fan (2) can be controlled by selecting one of the first cooling fan linear control (CPL1) and the first cooling fan PID control (PID1), the fuel cell stack (1) can be prevented from being overcooled or overheated, thereby mitigating the voltage drop of the fuel cell stack (1) and reducing the power consumption required to operate the cooling fan (2) as the cooling fan (2) operates efficiently.

[0094] FIG. 6 is a flowchart illustrating a method for controlling the temperature of a fuel cell stack according to cooling fan control according to a second embodiment of the present invention.

[0095] Referring to FIG. 6, the temperature control method (200) of a fuel cell stack according to a second embodiment of the present invention, which controls the temperature of a fuel cell stack by means of a cooling fan, may include a fuel cell stack power generation preparation step (S210), a fuel cell stack power generation start step (S220), a temperature monitoring step (S230), a control value and temperature comparison step (S240), and a cooling fan control step (S250).

[0096] Since the temperature control method (200) of a fuel cell stack according to cooling fan control according to the present embodiment is composed of the same steps as the temperature control method (100) of a fuel cell stack according to cooling fan control according to the first embodiment of the present invention, except for the control value and temperature comparison step (S240) and the cooling fan control step (S250), a detailed description of the steps identical to the temperature control method (100) of a fuel cell stack according to cooling fan control according to the first embodiment of the present invention will be omitted below.

[0097] The control value and temperature comparison step (S240) according to the present embodiment is the cooling air outlet temperature (T S ) and cooling fan linear control temperature range (T CPL Linear control temperature (T) within ) CL A first temperature comparison step (S241) comparing ) and a cooling air outlet temperature (T S ), fuel cell stack target temperature (T ST ) and linearly controlled temperature (T CL It may include a second temperature comparison step (S242) and a first power generation time and temperature comparison step (S243) for comparing ).

[0098] Here, since the first temperature comparison step (S241) and the second temperature comparison step (S242) of the control value and temperature comparison step (S240) according to the present embodiment are identical to the first temperature comparison step (S141) and the second temperature comparison step (S142) of the temperature control method (100) of a fuel cell stack according to cooling fan control according to the first embodiment of the present invention, a detailed description thereof will be omitted below.

[0099] In the first power generation time and temperature comparison step (S243) according to the present embodiment, the fuel cell stack power generation time (F), which is the current power generation continuous time of the fuel cell stack, is used. GT ) and fuel cell stack power generation target time (F GTT Compare ) and cooling air outlet temperature (T S ) and fuel cell stack target temperature (T ST ) can be compared.

[0100] Additionally, the cooling fan control step (250) according to the present embodiment may include a first cooling fan minimum rotation control step (S251), a first cooling fan linear control step (S252), a second cooling fan PID control step (S253) for controlling the cooling fan (2) with a second PID control, and a second cooling fan minimum rotation control step (S254) for controlling the cooling fan (2) with a second minimum rotation.

[0101] Here, since the first cooling fan minimum rotation control step (S251) and the first cooling fan linear control step (S252) of the cooling fan control step (250) according to the present embodiment are identical to the first cooling fan minimum rotation control step (S151) and the first cooling fan linear control step (S152) of the temperature control method (100) of the fuel cell stack according to the first embodiment of the present invention, a detailed description thereof will be omitted below.

[0102] As illustrated in FIG. 6, the first control information (C) related to the first cooling fan minimum rotation control step (S251) according to the present embodiment I1 ), second control information (C) related to the first cooling fan linear control step (S252) I2 ), fourth control information (C) related to the second cooling fan PID control step (S253) I4 ) and the fifth control information (C) related to the second cooling fan minimum rotation control step (S254). I5 ) can be transmitted to the control unit (9) and used to control the cooling fan (2).

[0103] In the cooling fan control step (250) according to the present embodiment, the cooling air outlet temperature (T) in the first temperature comparison step (S241) S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step (S242), the cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST It is compared as being greater than ), and in the first power generation time and temperature comparison step (S243) which proceeds after a certain period of time has elapsed following the second temperature comparison step (S242), the fuel cell stack power generation time (F GT ) is the fuel cell stack power generation target time (F GTT Exceeding ) and cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST If compared to a value greater than ) the second cooling fan PID control step (253) is selected, the cooling fan (2) can be controlled by the second PID.

[0104] In addition, in the cooling fan control step (250) according to the present embodiment, the cooling air outlet temperature (T) in the first temperature comparison step (S241) S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step (S242), the cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST It is compared as being greater than ), and in the first power generation time and temperature comparison step (S243) which proceeds after a certain period of time has elapsed following the second temperature comparison step (S242), the fuel cell stack power generation time (F GT ) is the fuel cell stack power generation target time (F GTT Exceeding ) and the above cooling air outlet temperature (T S ) is the above fuel cell stack target temperature (T ST If compared to being less than ), the second cooling plate minimum rotation control step (S254) is selected so that the cooling fan (2) can be controlled to the second minimum rotation.

[0105] Here, since the cooling fan (2) control mechanism in the second cooling plate minimum rotation control step (S254) according to the present embodiment and the cooling fan (2) control mechanism in the first cooling plate minimum rotation control step (S151) according to the first embodiment of the present invention are identical, a detailed description thereof is omitted.

[0106] Ultimately, according to the temperature control method (200) of a fuel cell stack by cooling fan control according to the present embodiment, the fuel cell stack power generation time (F) according to the present embodiment GT ) and fuel cell stack power generation target time (F GTT Comparison results of ) and cooling air outlet temperature (T S ) and fuel cell stack target temperature (T ST Since the cooling fan (2) can be controlled by selecting one of the second cooling fan minimum rotation control and the second cooling fan PID control steps based on the comparison result of ), the fuel cell stack (1) can be prevented from being overcooled or overheated, thereby mitigating the voltage reduction of the fuel cell stack (1) and reducing the power consumption required for the operation of the cooling fan (2) as the cooling fan (2) is operated efficiently.

[0107] FIG. 7 is a flowchart illustrating a method for controlling the temperature of a fuel cell stack according to cooling fan control according to a third embodiment of the present invention.

[0108] Referring to FIG. 7, the temperature control method (300) of a fuel cell stack according to cooling fan control according to the third embodiment of the present invention may include a fuel cell stack power generation preparation step (S310), a fuel cell stack power generation start step (S320), a temperature monitoring step (S330), a control value and temperature comparison step (S340), and a cooling fan control step (S350).

[0109] Since the temperature control method (300) of a fuel cell stack according to cooling fan control according to the present embodiment is composed of the same steps as the temperature control method (100) of a fuel cell stack according to cooling fan control according to the first embodiment of the present invention, except for the control value and temperature comparison step (S340) and the cooling fan control step (S350), a detailed description of the steps identical to the temperature control method (100) of a fuel cell stack according to cooling fan control according to the first embodiment of the present invention will be omitted below.

[0110] The control value and temperature comparison step (S340) according to the present embodiment is the cooling air outlet temperature (T S ) and cooling fan linear control temperature range (T CPL Linear control temperature (T) within ) CL A first temperature comparison step (S341) comparing ) and a cooling air outlet temperature (T S ), fuel cell stack target temperature (T ST ) and linearly controlled temperature (T CL It may include a second temperature comparison step (S342) and a first generation current and temperature comparison step (S343) for comparing ).

[0111] Here, since the first temperature comparison step (S341) and the second temperature comparison step (S342) of the control value and temperature comparison step (S340) according to the present embodiment are identical to the first temperature comparison step (S141) and the second temperature comparison step (S142) of the temperature control method (100) of a fuel cell stack according to cooling fan control according to the first embodiment of the present invention, a detailed description thereof will be omitted below.

[0112] In the first generation current and temperature comparison step (S343) according to the present embodiment, the fuel cell stack measured current (S) according to the generation of the fuel cell stack A ) and fuel cell stack target current (S AT Compare ) and cooling air outlet temperature (T S ) and fuel cell stack target temperature (T ST ) can be compared.

[0113] Additionally, the cooling fan control step (350) according to the present embodiment may include a first cooling fan minimum rotation control step (S351), a first cooling fan linear control step (S352), a third cooling fan PID control step (S353) that controls the cooling fan (2) by third PID control, and a third cooling fan minimum rotation control step (S354) that controls the cooling fan (2) by third minimum rotation.

[0114] As illustrated in FIG. 7, according to the present embodiment, the first control information (C) related to the first cooling fan minimum rotation control step (S351) I1 ), second control information (C) related to the first cooling fan linear control step (S352) I2 ), 6th control information (C) related to the 3rd cooling fan PID control step (S353) I6 ) and the 7th control information (C) related to the 3rd cooling fan minimum rotation control step (354). I7 It can be transmitted to the control unit (9) and used to control the cooling fan (2).

[0115] Here, since the first cooling fan minimum rotation control step (S351) and the first cooling fan linear control step (S352) of the cooling fan control step (350) according to the present embodiment are identical to the first cooling fan minimum rotation control step (S151) and the first cooling fan linear control step (S152) of the temperature control method (100) of the fuel cell stack according to the first embodiment of the present invention, a detailed description thereof will be omitted below.

[0116] In the cooling fan control step (350) according to the present embodiment, the cooling air outlet temperature (T) in the first temperature comparison step (S341) S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step (S342), the cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T STIt is compared to be greater than ), and in the first generation current and temperature comparison step (S343) which proceeds after a certain period of time has elapsed following the second temperature comparison step (S342), the fuel cell stack measurement current (S A ) is the fuel cell stack target current (S AT Exceeding ) and cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST If compared to a value greater than ) the third cooling fan PID control step (S353) is selected, the cooling fan (2) can be controlled by the third PID.

[0117] In addition, in the cooling fan control step (350) according to the present embodiment, the cooling air outlet temperature (T) in the first temperature comparison step (S341) S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step (S342), the cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST It is compared to be greater than ), and in the first generation current and temperature comparison step (S343) which proceeds after a certain period of time has elapsed following the second temperature comparison step (S342), the fuel cell stack measurement current (S A ) is the fuel cell stack target current (S AT Exceeding ) and cooling air outlet temperature (T S ) is the fuel cell stack target temperature (T ST If compared to being less than ), the third cooling plate minimum rotation control step (S354) is selected so that the cooling fan (2) can be controlled to the third minimum rotation.

[0118] Here, since the cooling fan (2) control mechanism in the third cooling plate minimum rotation control step (S354) according to the present embodiment and the cooling fan (2) control mechanism in the first cooling plate minimum rotation control step (S151) according to the first embodiment of the present invention are identical, a detailed description thereof is omitted.

[0119] Ultimately, according to the temperature control method (200) of a fuel cell stack by cooling fan control according to the present embodiment, the fuel cell stack measurement current (S) according to the present embodiment A ) and fuel cell stack target current (S AT Comparison results of ) and cooling air outlet temperature (T S ) and fuel cell stack target temperature (T ST Since the cooling fan (2) can be controlled by selecting one of the third cooling fan minimum rotation control and third cooling fan PID control steps based on the comparison result of ), the fuel cell stack (1) can be prevented from being overcooled or overheated, thereby mitigating the voltage reduction of the fuel cell stack (1) and reducing the power consumption required for the operation of the cooling fan (2) as the cooling fan (2) is operated efficiently.

[0120] FIG. 8 is a flowchart illustrating a method for controlling the temperature of a fuel cell stack according to cooling fan control according to the fourth embodiment of the present invention.

[0121] Referring to FIG. 8, the temperature control method (400) of a fuel cell stack according to a fourth embodiment of the present invention, which controls a cooling fan, may include a fuel cell stack power generation preparation step (S410), a fuel cell stack power generation start step (S420), a temperature monitoring step (S430), a control value and temperature comparison step (S440), and a cooling fan control step (S450).

[0122] Since the temperature control method (400) of a fuel cell stack according to cooling fan control according to the present embodiment is composed of the same steps as the temperature control method (100) of a fuel cell stack according to cooling fan control according to the first embodiment of the present invention, except for the control value and temperature comparison step (S440) and the cooling fan control step (S450), a detailed description of the steps identical to the temperature control method (100) of a fuel cell stack according to cooling fan control according to the first embodiment of the present invention will be omitted below.

[0123] Cooling air outlet temperature (T S) and cooling fan linear control temperature range (T CPL Linear control temperature (T) within ) CL A first temperature comparison step (S441) comparing ) and a cooling air outlet temperature (T S ), fuel cell stack target temperature (T ST ), linearly controlled temperature (T CL It may include a second temperature comparison step (S442) and a first fuel cell stack external temperature comparison step (S443) for comparing ).

[0124] Here, since the first temperature comparison step (S441) and the second temperature comparison step (S442) of the control value and temperature comparison step (S440) according to the present embodiment are identical to the first temperature comparison step (S141) and the second temperature comparison step (S142) of the temperature control method (100) of a fuel cell stack according to cooling fan control according to the first embodiment of the present invention, a detailed description thereof will be omitted below.

[0125] Additionally, the cooling fan control step (450) according to the present embodiment may include a first cooling fan minimum rotation control step (S451), a first cooling fan PID control step (S452), a first cooling fan linear control step (S453), and a second cooling fan linear control step (S454).

[0126] As illustrated in FIG. 8, the first control information (C) related to the first cooling fan minimum rotation control step (S451) according to the present embodiment I1 ), second control information (C) related to the first cooling fan linear control step (S452) I2 ), third control information (C) related to the first cooling fan PID control step (S453) I3 ) and the 8th control information (C) related to the 2nd cooling fan linear control step (S454). I8 ) can be transmitted to the control unit (9) and used to control the cooling fan (2).

[0127] Here, the first cooling fan minimum rotation control step (S451), the first cooling fan PID control step (S452), and the first cooling fan linear control step (S453) of the cooling fan control step (450) according to the present embodiment are each identical to the first cooling fan minimum rotation control step (S151), the first cooling fan PID control step (S152), and the first cooling fan linear control step (S153) of the temperature control method (100) of the fuel cell stack according to the first embodiment of the present invention, so a detailed description thereof will be omitted below.

[0128] In the second cooling fan linear control step (S454) according to the present embodiment, the cooling fan (2) can be controlled with a second linear slope that is smaller than the first linear slope in the first cooling fan linear control step (S453).

[0129] In the cooling fan control step (450) according to the present embodiment, in the first temperature comparison step (441), the cooling air outlet temperature (T S ) is the linearly controlled temperature (T CL It is compared to be greater than ), and in the second temperature comparison step (442), the fuel cell stack target temperature (T ST ) is the cooling air outlet temperature (T S It is compared to exceed ), and in the first fuel cell stack external temperature comparison step (443), the current external temperature (OT) of the fuel cell stack S ) is the fuel cell stack target external temperature (OT ST If compared to being less than ) the second linear control step (S454) is selected, the cooling fan can be linearly controlled by the second cooling fan.

[0130] Ultimately, according to the temperature control method (400) of a fuel cell stack by cooling fan control according to the present embodiment, the current external temperature (OT) of the fuel cell stack according to the present embodiment S ) and fuel cell stack target external temperature (OT ST Since the second linear control step is selected based on the comparison result of ) to control the cooling fan (2), the current external temperature (OT) of the fuel cell stack is controlled.S By preventing the fuel cell stack (1) from being overcooled or overheated, the voltage reduction of the fuel cell stack (1) can be mitigated, and as the cooling fan (2) operates efficiently, the power consumption required for operating the cooling fan (2) can be reduced.

[0131] Although the present invention has been described with reference to embodiments thereof, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

Claims

1. A fuel cell stack power generation preparation step comprising a step of applying power to peripheral devices of a fuel cell stack and a fuel cell stack control value setting step in which a fuel cell stack control value of the fuel cell stack is set; After the above fuel cell stack power generation preparation step, a fuel cell stack power generation start step for starting power generation of the above fuel cell stack; A temperature monitoring step including a step of monitoring a first temperature associated with the fuel cell stack after the fuel cell stack power generation start step; After the temperature monitoring step, a control value and temperature comparison step comprising a step of comparing the fuel cell stack control value with the first temperature associated with the fuel cell stack; and A method for controlling the temperature of a fuel cell stack according to cooling fan control, comprising: a cooling fan control step in which, after the step of comparing the control value and the temperature, one of the following is selected to control the cooling fan by controlling the cooling fan, which is one of the peripheral devices, to a first minimum rotational rotation according to the result of comparing the fuel cell stack control value and the first temperature: a first cooling fan minimum rotational rotation control step in which the cooling fan is controlled to a first minimum rotational rotation; a first cooling fan linear rotational rotation control step in which the cooling fan is controlled to a first linear slope; and a first cooling fan PID rotational rotation control step in which the cooling fan is controlled by a first PID rotation, thereby controlling the cooling fan.

2. In Paragraph 1, The above fuel cell stack control value is the cooling fan linear control temperature range (T CPL ), the fuel cell stack target temperature (T) which is the target temperature during power generation of the above fuel cell stack ST ), target external temperature of the fuel cell stack (OT) of the above fuel cell stack ST ), the target temperature of the fuel cell stack (T ST Fuel cell stack power generation target time (F) according to ) GTT ) and the target temperature of the fuel cell stack (T ST Fuel cell stack target current (S) according to ) AT ...including ), and the first temperature associated with the fuel cell stack is the cooling air outlet temperature (T) of the cooling air discharged from the fuel cell stack. S ) and current external temperature of the fuel cell stack measured outside the fuel cell stack (OT S A method for controlling the temperature of a fuel cell stack according to cooling fan control including ).

3. In Paragraph 2, The above control value and temperature comparison step is, The above cooling air outlet temperature (T S ) and the above cooling fan linear control temperature range (T CPL Linear control temperature (T) within ) CL A first temperature comparison step comparing ) and The above cooling air outlet temperature (T S ), the target temperature of the fuel cell stack (T ST ) and the linear control temperature (T CL A method for controlling the temperature of a fuel cell stack according to cooling fan control, comprising a second temperature comparison step for comparing ).

4. In Paragraph 3, In the first temperature comparison step above, the cooling air outlet temperature (T S ) is the above linear control temperature (T CL In cases where it is compared to be less than ), A method for controlling the temperature of a fuel cell stack according to cooling fan control, wherein the first cooling fan minimum rotation control step is selected in the above cooling fan control step.

5. In Paragraph 3, In the first temperature comparison step above, the cooling air outlet temperature (T S ) is the above linear control temperature (T CL It is compared to be greater than ), In the second temperature comparison step above, the fuel cell stack target temperature (T ST ) is the above cooling air outlet temperature (T S If compared to exceed ), A method for controlling the temperature of a fuel cell stack according to cooling fan control, wherein the first cooling fan linear control step is selected in the above cooling fan control step.

6. In Paragraph 3, In the first temperature comparison step above, the cooling air outlet temperature (T S ) is the above linear control temperature (T CL It is compared to be greater than ), In the second temperature comparison step above, the cooling air outlet temperature (T S ) is the above fuel cell stack target temperature (T ST If compared to be greater than ), A method for controlling the temperature of a fuel cell stack according to cooling fan control, wherein the first cooling fan PID control step is selected in the above cooling fan control step.

7. In Paragraph 3, The above control value and temperature comparison step is, Fuel cell stack power generation time (F), which is the current power generation continuous time of the above fuel cell stack GT ) and the above fuel cell stack power generation target time (F GTT Compare ) and the above cooling air outlet temperature (T S ) and the target temperature of the fuel cell stack (T ST It further includes a first power generation time and temperature comparison step that compares ), A method for controlling the temperature of a fuel cell stack according to cooling fan control, wherein the cooling fan control step further comprises a second cooling fan PID control step for controlling the cooling fan with a second PID control and a second cooling fan minimum rotation control step for controlling the cooling fan with a second minimum rotation.

8. In Paragraph 7, In the first temperature comparison step above, the cooling air outlet temperature (T S ) is the above linear control temperature (T CL It is compared to be greater than ), In the second temperature comparison step above, the cooling air outlet temperature (T S ) is the above fuel cell stack target temperature (T ST It is compared to be greater than ), In the first power generation time and temperature comparison step performed after a certain period of time has elapsed following the second temperature comparison step, the fuel cell stack power generation time (F GT ) is the above fuel cell stack power generation target time (F GTT Exceeding ) and the above cooling air outlet temperature (T S ) is the above fuel cell stack target temperature (T ST If compared to be greater than ), A method for controlling the temperature of a fuel cell stack according to cooling fan control, wherein the second cooling fan PID control step is selected in the above cooling plate control step.

9. In Paragraph 7, In the first temperature comparison step above, the cooling air outlet temperature (T S ) is the above linear control temperature (T CL It is compared to be greater than ), In the second temperature comparison step above, the cooling air outlet temperature (T S ) is the above fuel cell stack target temperature (T ST It is compared to be greater than ), In the first power generation time and temperature comparison step performed after a certain period of time has elapsed following the second temperature comparison step, the fuel cell stack power generation time (F GT ) is the above fuel cell stack power generation target time (F GTT Exceeding ) and the above cooling air outlet temperature (T S ) is the above fuel cell stack target temperature (T ST If compared to being less than ), A method for controlling the temperature of a fuel cell stack according to a cooling fan control in which the second cooling plate minimum rotation control is selected in the above cooling plate control step.

10. In Paragraph 3, The above control value and temperature comparison step is, Fuel cell stack measured current (S) according to the development of the fuel cell stack A ) and fuel cell stack target current (S AT Compare ) and the above cooling air outlet temperature (T S ) and the target temperature of the fuel cell stack (T ST It further includes a first generation current and temperature comparison step for comparing ), A method for controlling the temperature of a fuel cell stack according to cooling fan control, wherein the cooling fan control step further comprises a third cooling fan PID control step for controlling the cooling fan with a third PID control and a third cooling fan minimum rotation control step for controlling the cooling fan with a third minimum rotation.

11. In Paragraph 10, In the first temperature comparison step above, the cooling air outlet temperature (T S ) is the above linear control temperature (T CL It is compared to be greater than ), In the second temperature comparison step above, the cooling air outlet temperature (T S ) is the above fuel cell stack target temperature (T ST It is compared to be greater than ), In the first generation current and temperature comparison step performed after a certain period of time has elapsed following the second temperature comparison step, the fuel cell stack measurement current (S A ) is the above fuel cell stack target current (S AT Exceeding ) and the above cooling air outlet temperature (T S ) is the above fuel cell stack target temperature (T ST If compared to be greater than ), A method for controlling the temperature of a fuel cell stack according to cooling fan control in which the third cooling fan PID control step is selected in the above cooling plate control step.

12. In Paragraph 10, In the first temperature comparison step above, the cooling air outlet temperature (T S ) is the above linear control temperature (T CL It is compared to be greater than ), In the second temperature comparison step above, the cooling air outlet temperature (T S ) is the above fuel cell stack target temperature (T ST It is compared to be greater than ), In the first generation current and temperature comparison step performed after a certain period of time has elapsed following the second temperature comparison step, the fuel cell stack measurement current (S A ) is the above fuel cell stack target current (S AT Exceeding ) and the above cooling air outlet temperature (T S ) is the above fuel cell stack target temperature (T ST If compared to being less than ), A method for controlling the temperature of a fuel cell stack according to a cooling fan control in which the third cooling plate minimum rotation control is selected in the above cooling plate control step.

13. In Paragraph 3, The above control value and temperature comparison step is, The above fuel cell stack target external temperature (OT) ST ) and the current external temperature (OT) of the fuel cell stack S It further includes a first fuel cell stack external temperature comparison step that compares ), The above cooling fan control step is, A method for controlling the temperature of a fuel cell stack according to cooling fan control, further comprising a second cooling fan linear control step of controlling the cooling fan with a second linear slope smaller than the first linear slope.

14. In Paragraph 13, In the first temperature comparison step above, the cooling air outlet temperature (T S ) is the above linear control temperature (T CL It is compared to be greater than ), In the second temperature comparison step above, the fuel cell stack target temperature (T ST ) is the above cooling air outlet temperature (T S It is compared to exceed ), In the above first fuel cell stack external temperature comparison step, the current external temperature (OT) of the fuel cell stack S ) is the target external temperature (OT) of the above fuel cell stack ST In cases where it is compared to be less than or equal to ), A method for controlling the temperature of a fuel cell stack according to cooling fan control in which the second linear control step is selected in the cooling fan control step above.

Images