CN114674400A - Efficient calibration system for fuel cell air flow meter and control method thereof - Google Patents
Efficient calibration system for fuel cell air flow meter and control method thereof Download PDFInfo
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Abstract
The invention discloses a high-efficiency calibration system of a fuel cell air flow meter and a control method thereof, which relate to the field of calibration of fuel cell air flow meters and solve the problems of more restriction factors, low precision and large error of the conventional fuel cell air flow meter during calibration, and the high-efficiency calibration system of the fuel cell air flow meter comprises an air supply module AO, a hydrogen supply module HO, a heat dissipation module WO, a control module UO and a PEMFC1 fuel cell, wherein the air supply module AO comprises an air filter A5, an air compressor A3, a back-flushing valve A6, an air inlet valve A4, an air outlet valve A2, a bypass valve A2 and a purging and discharging valve A7. The system has the characteristics that the closed space formed by the pipeline is used for pressure building in the calibration process, the calibration operation can be realized more conveniently compared with other disclosed methods, and the error caused by the penetration of the proton membrane is inhibited, so that the calibration coefficient can be calculated more accurately.
Description
Technical Field
The invention relates to the field of calibration of fuel cell air flow meters, in particular to a high-efficiency calibration system of a fuel cell air flow meter and a control method thereof.
Background
A fuel cell is a device that directly converts chemical energy into electrical energy by passing a fuel and an oxidant into an anode and a cathode, respectively, that contain some other structure. A polymer electrolyte fuel cell is a cell constructed by using a characteristic that an electrolyte membrane allows only protons to pass through, each cell is composed of an anode, a cathode, and an electrolyte membrane interposed between the electrodes, and a plurality of fuel cells are generally stacked in order to obtain a high power output. The electrolyte membrane in a polymer electrolyte fuel cell is a polymer, can be manufactured relatively easily and can be operated at low temperature, while having higher efficiency in energy conversion than thermal power generation, and is highly advantageous as a power source for portable power sources and movable objects.
The fuel cell system is provided with a compressor for supplying air required for reaction, diluting discharged hydrogen, controlling water content and the like, two compressors are known to be applied to the fuel cell system, one is a roots type compressor, the other is a turbine type compressor, in order to realize accurate supply of air, an air flow meter is generally installed behind the compressor for metering the supplied air amount, the fuel cell control system regulates the operation of the compressor according to a flow instruction value calculated by a power generation demand and a measurement value of the flow meter to realize rapid and high-precision supply of air, therefore, the measurement accuracy of the flow meter is important, if there is a deviation in metering, on one hand, the fuel cell cannot obtain the required power generation amount, on the other hand, the air supplied to the interior of the fuel cell affects the water content thereof, for example, the air exceeding the water content required for power generation increases the water amount taken away, the fuel cell is dried, and the power generation efficiency is reduced, so the metering accuracy of the flowmeter is particularly important, and the accuracy of the flowmeter is reduced with the lapse of time, which brings errors to the measurement, so that the flowmeter needs to be calibrated discontinuously.
In the previously published patent, such as CN102947997A, the amount of water permeating into the anode varies due to the difference in the internal water content of the fuel cell under different supplied air, and thus the power consumption of the hydrogen circulation pump is affected, so as to perform calibration, but the calibration process is relatively complicated, the indirect influence factors are too many, and the accuracy and the practicability are not high; the published CN102598381B uses a fixed space between the inside of the fuel cell and the air inlet/outlet valve to perform calibration, and in this method, air with higher pressure is supplied to the cathode line, and the precision of calibration is still affected by the permeation phenomenon of the proton membrane, so a simpler and more practical method with higher calibration precision is required. Therefore, the high-efficiency calibration system for the fuel cell air flow meter and the control method thereof are provided.
Disclosure of Invention
The invention aims to provide a high-efficiency calibration system of a fuel cell air flow meter and a control method thereof, which solve the problems of more restriction factors, low precision and large error of the conventional fuel cell air flow meter during calibration.
In order to achieve the purpose, the invention provides the following technical scheme: a high-efficiency calibration system for an air flow meter of a fuel cell comprises an air supply module AO, a hydrogen supply module HO, a heat dissipation module WO, a control module UO and a PEMFC1 fuel cell, wherein the air supply module AO comprises an air filter A5, an air compressor A3, a back flushing valve A6, an air inlet valve A4, an air outlet valve A2, a bypass valve A2, a flushing relief valve A7, an air inlet pressure sensor P3, an outlet pressure sensor P4 and interconnecting pipelines.
Preferably, the hydrogen supply module H0 comprises a hydrogen tank TK1, a bottle mouth valve H1, a hydrogen pressure regulating valve H2, a hydrogen flow controller H3, a hydrogen circulating pump H4, a gas-liquid separator H5, a hydrogen pipeline discharge valve H6, a hydrogen inlet pressure gauge P1, a hydrogen outlet pressure gauge P2 and interconnecting pipelines, the hydrogen tank TK1 is sequentially connected with a bottle neck valve H1, a hydrogen pressure regulating valve H2 and a hydrogen flow controller H3, the hydrogen flow controller H3 was connected to the hydrogen inlet of the PEMFC1 fuel cell, and a hydrogen inlet pressure gauge P1 is installed on the hydrogen flow controller H3, a hydrogen outlet pressure gauge P2 is installed on the hydrogen outlet of the PEMFC1 fuel cell, and the hydrogen outlet of the fuel cell of the PEMFC1 is connected with a gas-liquid separator H5, the gas-liquid separator H5 is respectively connected with a hydrogen circulating pump H4 and a hydrogen pipeline discharge valve H6, and the hydrogen circulating pump H4 is connected with the hydrogen inlet of the fuel cell of the PEMFC 1.
Preferably, the heat dissipation module W0 includes a three-way regulating valve W1, a radiator W2, a coolant circulation pump W3, a coolant outlet temperature sensor T1, a coolant inlet temperature sensor T2, and interconnecting pipes, the hydrogen inlet of the EMFC1 fuel cell is connected with the three-way regulating valve W1, and the hydrogen inlet of the EMFC1 fuel cell is mounted with the coolant outlet temperature sensor T1, the three-way regulating valve W1 is respectively connected with a radiator W2 and a coolant circulation pump W3, and the radiator W2 is interconnected with the coolant circulation pump W3, the coolant circulation pump W3 is connected with the air outlet of the EMFC1 fuel cell, and the coolant inlet temperature sensor T2 is mounted at the air outlet.
Preferably, the control module U0 includes an ambient temperature sensor T3, the ambient temperature sensor T3 is mounted on the controller U0, and the controller U0 is in control signal connection with the air outlet valve a1, the radiator W2 and the hydrogen pressure regulating valve H2.
Preferably, a back purge valve a6 is connected to the air filter a5, an air compressor A3 is connected to the back purge valve a6, an air inlet valve a4 and a bypass valve a2 are respectively connected to an outlet of the air compressor A3, the bypass valve a2 is connected to an outlet of the air outlet valve a1, an air inlet pressure sensor P3 is connected between the air compressor A3 and the air inlet valve a4, and an outlet pressure sensor P4 is connected between the air outlet valve a1 and an outlet of the PEMFC1 fuel cell.
A control method of a high-efficiency calibration system of a fuel cell air flow meter comprises the following steps:
s1: first, S10 judges whether a certain time Tn has elapsed since the previous calibration of the fuel cell, for example, 7d, the setting may be changed, if not, i.e., S10 is no, the control is ended, and if the operation stop signal S10 is received, the control is performed S20;
s2: judging whether the purging is finished, and if the internal temperature T of the fuel cell is the same as the external air temperature T0 or the difference between the internal temperature T and the external air temperature T0 is in a certain range, so as to reduce the subsequent calculation error, and the system keeps the judgment until the judgment is yes, and then the S30 is executed;
S3: closing the fuel cell inlet valve A4 to form a closed pipeline between the compressor A3 and the fuel cell inlet valve, wherein the volume of the closed space is Vn and is determined according to the system design, and the volume is a fixed value;
s4: then S40 is entered to start the compressor and run for a preset time tn, and the change value delta P of P3 and the accumulated measurement value V1 of the flowmeter are recorded;
s5: then S50 is entered to judge whether delta P is larger than delta Pn, if not, the established sealed space has leakage, S90 is executed to judge whether the leakage problem occurs more than 2 times, if S90 is yes, S110 is entered to send out pressure building fault alarm, and calibration control is stopped;
s6: if the judgment of S90 is no, the process goes to S100, the valve A2 is opened to make the pressure of P3 equal to the atmospheric pressure, then the process goes to S40 to operate again, if the judgment of S50 is yes, the process goes to S60, and the calibration coefficient M1 is calculated;
s7: the control system U0 stores M1 internally, then enters S70 to perform the whole process again to obtain M2, and then calculates and stores the calibration coefficient M to finish the calibration process of the air flow meter;
s8: after calibration, when the fuel cell is operated again, if the fuel cell system calculates the air flow to be supplied as V according to the power generation demand, the flow F measured by the air flow meter can be calculated.
Preferably, the calculation formula of M1 is:
M1＝Vn*ΔP/(V1*Pa)
wherein Pa is atmospheric pressure, and is determined according to local air pressure actual value.
Preferably, the calculation formula of M is:
M＝(M1+M2)/2。
preferably, the calculation formula of F is:
F＝V/M。
compared with the related art, the high-efficiency calibration system of the fuel cell air flow meter and the control method thereof provided by the invention have the following beneficial effects:
the invention provides a high-efficiency calibration system of a fuel cell air flow meter and a control method thereof. The closed space formed by the pipeline is used for pressure building in the calibration process, so that the calibration operation can be realized more conveniently compared with other disclosed methods, errors caused by proton membrane permeation are inhibited, and the calibration coefficient can be calculated more accurately.
Drawings
Fig. 1 is a schematic diagram of a fuel cell air flow meter high efficiency calibration system of the present invention.
Fig. 2 is a flow chart of a calibration control of a fuel cell air flow meter high efficiency calibration system of the present invention.
Fig. 3 is a schematic diagram of a pressure variation interval of an efficient calibration system for a fuel cell air flow meter according to the present invention.
Fig. 4 is a modification of the calibration control flowchart of the high-efficiency calibration system for a fuel cell air flow meter according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1-4, the present invention provides a technical solution: a high-efficiency calibration system for an air flow meter of a fuel cell comprises an air supply module AO, a hydrogen supply module HO, a heat dissipation module WO, a control module UO and a PEMFC1 fuel cell, wherein the air supply module AO comprises an air filter A5, an air compressor A3, a back-flushing valve A6, an air inlet valve A4, an air outlet valve A2, a bypass valve A2, a flushing relief valve A7, an air inlet pressure sensor P3, an outlet pressure sensor P4 and mutually connected pipelines.
The air supply module a0 includes an air filter a5, an air compressor A3, an a6 air flow meter, an air inlet valve a4, an air outlet valve a1, a bypass valve a2, a purge drain valve a7, an air inlet pressure sensor P3, an outlet pressure sensor P4, and interconnecting piping. The air filter A5 filters out the impurities and dust in the air, the delivery pressure and flow of the air are controlled by the air compressor A3, the air inlet valve A4 is a normally closed valve, which is opened when the air meets a certain pressure, the air outlet valve A1 is an adjustable valve, the pressure of the air supply in the fuel cell is controlled by adjusting the opening degree of the adjustable valve, the bypass valve A2 is an adjustable valve, which controls the inflow amount of the air from the outlet of the compressor A3 to the inside of the fuel cell, and can also be used to dilute the concentration of the hydrogen discharged from the hydrogen supply module H0 to meet the discharge requirement, the back flushing valve A6 is used for stopping flushing, and is opened when the fuel cell stops running, so that the air flows into the outlet of the fuel cell through the back flushing valve A6 for back flushing, the flushing discharge valve A7 is used to deliver the back flushing gas liquid to the discharge outlet, the air inlet pressure sensor P3 measures the air pressure entering the fuel cell, an outlet pressure sensor P4 measures the air pressure at the fuel cell outlet.
The hydrogen supply module H0 comprises a hydrogen tank TK1, a bottle mouth valve H1, a hydrogen pressure regulating valve H2, a hydrogen flow controller H3, a hydrogen circulating pump H4, a gas-liquid separator H5, a hydrogen pipeline discharge valve H6, a hydrogen inlet pressure gauge P1, a hydrogen outlet pressure gauge P2 and interconnecting pipelines. The hydrogen tank TK1 stores high-pressure hydrogen fuel such as 35MPa or 70MPa, or can be a fuel tank produced by reforming, the bottleneck valve H1 controls the on-off of hydrogen supply, the hydrogen pressure regulating valve H2 regulates the high-pressure hydrogen flowing out from the hydrogen tank, such as reducing the pressure of the high-pressure hydrogen to 200KPa, the hydrogen flow controller H3 is used for regulating the flow rate of the hydrogen supplied to the fuel cell, a proportional regulating valve or an electromagnetic pulse valve can be adopted, the hydrogen circulating pump H4 recycles the unreacted hydrogen discharged by the fuel cell to the hydrogen supply pipeline at a certain pressure and flow rate, so that the part of the hydrogen enters the fuel cell again for reaction, the utilization efficiency of the fuel is improved, the gas-liquid separator H5 is used for separating gas and water in the waste gas discharged from the hydrogen discharge pipeline of the fuel cell, the separated gas enters the hydrogen discharge circulating pump H4, the separated water is stored at the lower half end of the separator, the hydrogen pipeline valve H6 is opened at a certain period or according to the signal of the controller, the water in the gas-liquid separator and the non-hydrogen gas in the hydrogen pipeline, such as nitrogen and a small amount of hydrogen permeating from the cathode to the anode, are diluted by air and then discharged to the atmosphere with the concentration below the specified concentration, and a hydrogen inlet pressure gauge P1 and a hydrogen outlet pressure gauge P2 are respectively used for measuring the pressure of the hydrogen entering and discharging the fuel cell.
The radiator module W0 includes a three-way regulation valve W1, a radiator W2, a coolant circulation pump W3, a coolant outlet temperature sensor T1, a coolant inlet temperature sensor T2, and pipes connected to each other.
A cooling water outlet temperature sensor T1 and a coolant inlet temperature sensor T2 measure the coolant temperature at the outlet and inlet of the fuel cell cooling circuit respectively, in which the value of the cooling water outlet temperature sensor T1 can be regarded as the temperature inside the fuel cell, the radiator W2 is a device for cooling the coolant that flows therethrough, for example, the heat exchange pipe is provided with a fan for performing purge cooling or multiphase flow heat exchange equipment, the heat transfer pipeline three-way regulating valve W1 regulates the amount of coolant entering the radiator W2 according to the internal temperature of the fuel cell, the more coolant entering the radiator W2, the lower the temperature of the coolant at the inlet of the burner, which is beneficial to reducing the internal temperature of the fuel cell, generally, the internal temperature of the fuel cell is controlled to be between 60 and 80 ℃, the coolant circulating pump W3 regulates the circulating amount of the coolant, i.e., the flow rate, increasing the rotational speed of the coolant circulation pump W3 is more advantageous in achieving a temperature decrease of the fuel cell when a more rapid temperature decrease is required.
The FC1 is a fuel cell main body formed by stacking a plurality of fuel cells, and the amount of power generation of the fuel cell FC1 can be controlled by adjusting the supply amount of fuel and air. The controller U0 collects the data measured by the ambient temperature sensor T3 and each module, and adjusts the operation of components such as valves, pumps, compressors and the like according to the built-in control strategy and program, so that the power generation of the fuel cell meets the requirement of a control command.
In the present embodiment, as described above, when the fuel cell system stops operating, purging is completed, and the temperature approaches the ambient temperature, the calibration coefficient M can be determined according to the calibration control routine, the actual flow meter indicated value can be obtained by calculating the next air supply amount command value, the metering error of the flow meter can be eliminated, and the solid line air supply can be performed more accurately. The closed space formed by the pipeline is used for pressure building in the calibration process, so that the calibration operation can be realized more conveniently compared with other disclosed methods, errors caused by proton membrane permeation are inhibited, and the calibration coefficient can be calculated more accurately.
The second embodiment:
referring to fig. 1-4, on the basis of the first embodiment, the present invention provides a technical solution: a control method of a high-efficiency calibration system of a fuel cell air flow meter comprises the following steps:
the first step is as follows: first, S10 determines whether a certain time Tn, for example, 7d, has elapsed since the previous calibration of the fuel cell distance, the settings may be changed, if not, i.e., no in S10, the control is terminated, and if the operation stop signal S10 is received, the control is performed in S20;
the first step is as follows: judging whether the purging is finished or not, wherein the internal temperature T of the fuel cell is the same as the external air temperature T0, or the difference between the internal temperature T and the external air temperature T0 is within a certain range, so as to reduce the subsequent calculation error, and the system keeps the judgment until the judgment is yes, and then the step enters S30;
The first step is as follows: closing the fuel cell inlet valve A4 to form a closed pipeline between the compressor A3 and the fuel cell inlet valve, wherein the volume of the closed space is Vn and is determined according to the system design, and the volume is a fixed value;
the first step is as follows: then S40 is entered to start the compressor and run for a preset time tn, and the change value delta P of P3 and the accumulated measurement value V1 of the flowmeter are recorded;
the first step is as follows: then S50 is entered to judge whether delta P is larger than delta Pn, if not, the established sealed space has leakage, S90 is executed to judge whether the leakage problem occurs more than 2 times, if S90 is yes, S110 is entered to send out pressure building fault alarm, and calibration control is stopped;
the first step is as follows: if the judgment of S90 is no, the process goes to S100, the valve A2 is opened to make the pressure of P3 equal to the atmospheric pressure, then the process goes to S40 to operate again, if the judgment of S50 is yes, the process goes to S60, and the calibration coefficient M1 is calculated;
the first step is as follows: the control system U0 stores M1 internally, then enters S70 to perform the whole process again to obtain M2, and then calculates and stores the calibration coefficient M to finish the calibration process of the air flow meter;
the first step is as follows: after calibration, when the fuel cell is operated again, if the fuel cell system calculates the air flow to be supplied as V according to the power generation demand, the flow F measured by the air flow meter can be calculated.
The formula for M1 is: m1 ═ Vn × Δ P/(V1 × Pa); wherein Pa is atmospheric pressure, and is determined according to local air pressure actual value.
The formula for M is: m ═ M1+ M2)/2.
The formula for F is: f is V/M.
As shown in fig. 3 below, the solid curve in the figure is Δ P, when a normal region is within a value of Δ Pn, and a fault region is over Δ Pn, the cause of the fault may be a pipeline leakage or a valve a4 cannot be completely closed, and the pressure change value of the fault region may not be used for calibrating the flow meter, so that an alarm needs to be given, and this control flow sets 2 confirmation operations, which reduces abnormal stop of the calibration process due to an unexpected situation (e.g. the first valve is not completely closed).
Example three:
referring to fig. 1-4, on the basis of the first embodiment, the present invention provides a technical solution: fig. 3 is a modified example of the present invention, in which S90-110 is replaced with S120-150 compared with the first embodiment, the other control and fuel cell structure principle is the same as that of the first embodiment, S120 determines whether the absolute value of the difference between the calibration coefficients obtained twice is lower than a preset value Δ M, Δ M is a calculation deviation value set according to an error such as a measurement error that may exist in the same calibration process twice, if yes, S80 is entered to perform the same operation as that of the first embodiment, otherwise, S130 is entered, because when the absolute value of the difference between the calibration coefficients obtained twice is higher than a set threshold, it means that an error that cannot be ignored occurs in the calibration process twice, S130 determines whether the measurement cycle has a problem of homogeneity twice, if yes, the pressure build-up failure alarm indicated in S150 is performed, and the calibration is stopped, otherwise, S140 is performed, the calibration process is resumed, and acquiring the calibration coefficient twice again to perform the judgment in S120 again, in this modification, the judgment of the original differential pressure deviation is adjusted to the judgment of the calibration coefficient deviation, so that the finally determined calibration coefficient makes the measured value of the flow meter approach to the required true value, and the measured value corrected by the calibration coefficient is restrained from deviating more from the true value.
Claims (9)
1. A high-efficiency calibration system of a fuel cell air flow meter comprises an air supply module AO, a hydrogen supply module HO, a heat dissipation module WO, a control module UO and a PEMFC1 fuel cell, and is characterized in that the air supply module AO comprises an air filter A5, an air compressor A3, a back flushing valve A6, an air inlet valve A4, an air outlet valve A2, a bypass valve A2, a flushing drain valve A7, an air inlet pressure sensor P3, an outlet pressure sensor P4 and mutually connected pipelines.
2. The high-efficiency calibration system of the fuel cell air flow meter according to claim 1, wherein the hydrogen supply module H0 comprises a hydrogen tank TK1, a bottle-neck valve H1, a hydrogen pressure regulating valve H2, a hydrogen flow controller H3, a hydrogen circulating pump H4, a gas-liquid separator H5, a hydrogen pipeline bleed valve H6, a hydrogen inlet pressure gauge P1, a hydrogen outlet pressure gauge P2 and interconnecting pipelines, the hydrogen tank TK 27 is connected with the bottle-neck valve H1, the hydrogen pressure regulating valve H2 and the hydrogen flow controller H3 in sequence, the hydrogen flow controller H3 is connected with the hydrogen inlet of the PEMFC1 fuel cell, the hydrogen inlet pressure gauge P1 is installed on the hydrogen flow controller H3, the hydrogen outlet of the PEMFC 6 fuel cell is installed with the hydrogen outlet pressure gauge P2, the hydrogen outlet of the PEMFC1 fuel cell is connected with the gas-liquid separator H5, and the gas-liquid separator H5 is connected with the hydrogen bleed valve H6 and the hydrogen pipeline H6, the hydrogen circulation pump H4 is connected to the hydrogen inlet of the PEMFC1 fuel cell.
3. The fuel cell air flow meter high efficiency calibration system of claim 1, wherein the heat sink module W0 comprises a three-way regulating valve W1, a radiator W2, a coolant circulating pump W3, a coolant outlet temperature sensor T1, a coolant inlet temperature sensor T2 and interconnecting piping, the hydrogen inlet of the EMFC1 fuel cell is connected with the three-way regulating valve W1, the hydrogen inlet of the EMFC1 fuel cell is mounted with the coolant outlet temperature sensor T1, the three-way regulating valve W1 is respectively connected with a radiator W2 and a coolant circulating pump W3, the radiator W2 is connected with the coolant circulating pump W3, the coolant circulating pump W3 is connected with the air outlet of the EMFC1 fuel cell, and the coolant inlet temperature sensor T2 is mounted at the air outlet.
4. The fuel cell air flow meter high efficiency calibration system of claim 1, wherein said control module U0 includes an ambient temperature sensor T3, said controller U0 has an ambient temperature sensor T3 mounted thereon, said controller U0 is in control signal connection with an air outlet valve a1, a radiator W2, and a hydrogen pressure regulator valve H2.
5. The fuel cell air flow meter high efficiency calibration system of claim 1, wherein the air filter a5 is connected with a back purge valve a6, the back purge valve a6 is connected with an air compressor A3, the outlet of the air compressor A3 is connected with an air inlet valve a4 and a bypass valve a2 respectively, the bypass valve a2 is connected with the outlet of the air outlet valve a1, an air inlet pressure sensor P3 is connected between the air compressor A3 and the air inlet valve a4, and an outlet pressure sensor P4 is connected between the air outlet valve a1 and the outlet of the fuel cell PEMFC 1.
6. A control method of a high-efficiency calibration system of a fuel cell air flow meter is characterized by comprising the following steps:
s1: first, S10 judges whether a certain time Tn has elapsed since the previous calibration of the fuel cell, for example, 7d, the setting may be changed, if not, i.e., S10 is no, the control is ended, and if the operation stop signal S10 is received, the control is performed S20;
s2: judging whether the purging is finished, and if the internal temperature T of the fuel cell is the same as the external air temperature T0 or the difference between the internal temperature T and the external air temperature T0 is in a certain range, so as to reduce the subsequent calculation error, and the system keeps the judgment until the judgment is yes, and then the S30 is executed;
s3: closing the fuel cell inlet valve A4 to form a closed pipeline between the compressor A3 and the fuel cell inlet valve, wherein the volume of the closed space is Vn and is determined according to the system design, and the volume is a fixed value;
s4: then S40 is entered to start the compressor and run for a preset time tn, and the change value delta P of P3 and the accumulated measurement value V1 of the flowmeter are recorded;
s5: s50 is entered to judge whether delta P is larger than delta Pn, if not, the established closed space leaks, S90 is executed to judge whether the leakage problem occurs for more than 2 times, if S90 is yes, S110 is entered to send out a pressure build fault alarm, and the calibration control is stopped;
S6: if the judgment of S90 is no, the routine proceeds to S100, the a2 valve is opened to make the pressure of P3 atmospheric, the routine proceeds to S40, and the routine proceeds to S60 if the judgment of S50 is yes, and the calibration coefficient M1 is calculated;
s7: the control system U0 stores M1 internally, then the S70 is carried out again to obtain M2, then the calibration coefficient M is calculated and determined, and the M is stored, and the calibration process of the air flow meter is finished;
s8: after calibration, when the fuel cell is operated again, if the fuel cell system calculates the air flow to be supplied as V according to the power generation demand, the flow F measured by the air flow meter can be calculated.
7. The method as claimed in claim 6, wherein the formula of M1 is:
M1＝Vn*ΔP/(V1*Pa)
wherein Pa is atmospheric pressure, and is determined according to local air pressure actual value.
8. The method as claimed in claim 6, wherein the formula for M is:
M＝(M1+M2)/2。
9. the method as claimed in claim 6, wherein the formula of F is:
F＝V/M。
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