CN114636935A - Fuel cell impedance measuring system based on air compressor and control method - Google Patents
Fuel cell impedance measuring system based on air compressor and control method Download PDFInfo
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- CN114636935A CN114636935A CN202210448552.3A CN202210448552A CN114636935A CN 114636935 A CN114636935 A CN 114636935A CN 202210448552 A CN202210448552 A CN 202210448552A CN 114636935 A CN114636935 A CN 114636935A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04753—Pressure; Flow of fuel cell reactants
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Abstract
The application relates to the field of fuel cells and discloses a fuel cell impedance measuring system based on an air compressor, wherein the fuel cell impedance measuring system comprises an air inlet assembly and an air outlet assembly, the air inlet assembly is arranged at a first end of the fuel cell, and the air outlet assembly is arranged at a second end of the fuel cell; in the direct current voltage transmission mode, the real-time flow signal value is equal to the direct current flow signal value; after the real-time flow signal value is equal to the direct-current flow signal value, the control device synchronously starts the high-frequency disturbance mode, and the real-time flow signal value is equal to the composite flow signal value in the high-frequency disturbance mode; and a direct current/high frequency flow pressure decoupling model is arranged in the control device. The system for measuring the impedance of the electrochemical reaction medium of the fuel cell based on the air compressor and the control method thereof are provided, wherein the air compressor is used for applying high-frequency physical disturbance to the cathode measurement of the fuel cell and decoupling the pressure flow signal through a direct current/high-frequency flow pressure decoupling model.
Description
Technical Field
The application relates to the field of fuel cells, in particular to a fuel cell impedance measuring system and a control method based on an air compressor.
Background
In recent years, global fossil energy is gradually reduced, hydrogen energy is an important exploration direction for new energy transformation, the industrial development momentum is strong, the hydrogen energy becomes a focus of accumulated power of various countries, and the hydrogen energy becomes an important development object in energy transformation due to the advantages of environmental protection and ubiquitous energy. The development of hydrogen energy will promote the progress of the fuel cell, the impedance function of the electrochemical reaction medium is a key method for monitoring the internal state of the fuel cell at present, and the operation state of the fuel cell can be reflected by monitoring the impedance value of the electrochemical reaction medium, so that certain correction and adjustment can be further made on the operation state of the fuel cell.
The existing electrochemical reaction medium impedance state detection is usually carried out through oxygen transmission characteristic frequency and electrochemical characteristic frequency, however, when the oxygen transmission characteristic frequency and the electrochemical characteristic frequency are close, the two cannot be decoupled by the existing electrochemical reaction medium impedance measurement method, and meanwhile, impedance information cannot be effectively extracted under the disturbance frequency lower than 1 HZ.
Disclosure of Invention
The fuel cell impedance measuring system and the control method mainly solve the technical problems that in the prior art, the impedance state of the existing electrochemical reaction medium cannot be decoupled from the oxygen transmission characteristic frequency and the electrochemical characteristic frequency, and effective impedance information cannot be extracted under low disturbance frequency, and provide the fuel cell impedance measuring system and the control method based on the air compressor, wherein the air compressor applies high-frequency physical disturbance to the cathode measurement of the fuel cell, and the pressure flow signals are decoupled through a direct current/high-frequency flow pressure decoupling model.
In order to solve the technical problems and achieve the purpose of the application, the application provides an air compressor-based fuel cell impedance measuring system, which comprises an air inlet assembly and an air outlet assembly, wherein the air inlet assembly is arranged at a first end of a fuel cell, and the air outlet assembly is arranged at a second end of the fuel cell; the first end of the fuel cell is provided with a DC/DC module, the second end of the fuel cell is provided with a voltage inspection device, and the fuel cell is connected with a control device through the DC/DC module; the air inlet assembly comprises an air inlet pipe and an air inlet component, a first inlet and a first outlet are respectively arranged at two ends of the air inlet pipe, the air inlet pipe is connected with the fuel cell through the first outlet, the air inlet component comprises an air compressor, an intercooler and a flowmeter which are sequentially arranged on the air inlet pipe from the first inlet to the first outlet, the air compressor is connected with the control device through a motor, and the voltage inspection device is connected with the flowmeter and the control device; a direct current pressure transmission mode and a high-frequency disturbance mode are arranged in the control device, a direct current flow signal value and a composite flow signal value are arranged in the control device, and the flow signal value measured by the flowmeter is a real-time flow signal value; in the direct current voltage transmission mode, the real-time flow signal value is equal to the direct current flow signal value; after the real-time flow signal value is equal to the direct-current flow signal value, the control device synchronously starts the high-frequency disturbance mode, and the real-time flow signal value is equal to the composite flow signal value in the high-frequency disturbance mode; and a direct current/high frequency flow pressure decoupling model is arranged in the control device.
In one embodiment, the dc/high frequency flow pressure decoupling model includes a signal separation unit, a general pressure flow closed-loop control unit, and a high frequency pressure flow closed-loop control unit.
In an implementation mode, the air outlet assembly comprises an air outlet pipe and an air outlet part, a second inlet and a second outlet are respectively arranged at two ends of the air outlet pipe, the air outlet pipe is connected with the fuel cell through the second outlet, the air inlet part comprises an exhaust valve and a first pressure and temperature sensor, the exhaust valve and the first pressure and temperature sensor are sequentially arranged on the air outlet pipe from the second inlet to the second outlet, and the first pressure and temperature sensor and the exhaust valve are uniform.
In an implementation manner, a three-way valve is arranged on the air inlet pipe of the flow meter and the intercooler, the three-way valve is connected with the air outlet pipe through a middle pipe, and the three-way valve is connected with the control device.
In an embodiment, a second pressure and temperature sensor is disposed on the air inlet pipe between the three-way valve and the second outlet.
In an embodiment, a silencer is disposed on the intake pipe between the intercooler and the air compressor.
In one embodiment, the air compressor is connected to an air filter.
In order to solve the technical problems and achieve the purpose of the application, the application also provides a control method of the fuel cell electrochemical reaction medium impedance measuring system based on the air compressor, which is characterized by comprising the following steps:
starting the fuel cell, controlling the control device to input direct current to the motor, driving the air compressor to work by the motor and providing compressed air for the fuel cell, measuring a real-time flow signal value of the fuel cell by the flowmeter, and measuring a real-time voltage value of the fuel cell by the second temperature and pressure sensor;
when the real-time flow signal value is equal to the direct-current flow signal value, the control device controls the synchronous input of high-frequency current to the motor and controls the compressor until the real-time flow signal value is equal to the composite flow signal value;
sending the real-time flow signal value and the real-time pressure value to a control device, and obtaining an impedance value of an electrochemical reaction medium through decoupling analysis of a direct current/high frequency flow pressure decoupling model;
and analyzing and correcting the state of the fuel cell according to the impedance value of the electrochemical reaction medium.
Compared with the prior art, the fuel cell electrochemical reaction medium impedance measuring system based on the air compressor has the following beneficial effects:
the air compressor applies physical disturbance to the fuel cell in a way of compounding a direct current pressure transmission mode and a high-frequency disturbance mode, and monitors the pressure and flow of the fuel cell to obtain a direct current/high frequency flow pressure signal, then decoupling the direct current/high frequency flow pressure signal by a direct current/high frequency flow pressure decoupling model to obtain a direct current signal and a high frequency alternating current signal, wherein, the direct current signal is used as the input of a general pressure flow decoupling algorithm to carry out normal closed-loop control, the separated high-frequency alternating current signal is used as the input of high-frequency current injection closed-loop control to carry out high-frequency pressure/flow disturbance, and finally, the impedance value of the electrochemical reaction medium is calculated according to the pressure and flow signal value under the high-frequency disturbance, and the fuel cell state analysis and correction are performed, and the cathode pressure disturbance frequency meter as low as 0.1HZ can generate the voltage output disturbance of the fuel cell.
Therefore, the device has the characteristics of reasonable structure and convenience in use.
Drawings
FIG. 1 is a schematic diagram of the present application.
The reference numbers in the figures illustrate: 1. a fuel cell; 2. a DC/DC module; 3. a voltage inspection device; 4. a control device; 5. an air inlet pipe; 6. a first inlet; 7. a first outlet; 8. an air compressor; 9. an intercooler; 10. a flow meter; 11. a motor; 12. an air outlet pipe; 13. a second inlet; 14. a second outlet; 15. an exhaust valve; 16. a first pressure temperature sensor; 17. a third valve; 18. an intermediate pipe; 19. a second pressure temperature sensor; 20. a silencer device; 21. an air filter.
Detailed Description
In order to make the objects, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only a part of the embodiments of the present application, and not all 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 application.
The technical problems that the oxygen transmission characteristic frequency and the electrochemical characteristic frequency cannot be decoupled by detecting the impedance state of the existing electrochemical reaction medium in the prior art, and effective impedance information cannot be extracted under low disturbance frequency exist.
Therefore, one aspect of the present application provides a fuel cell impedance measuring system based on an air compressor, which is characterized by comprising an air inlet assembly and an air outlet assembly, wherein the air inlet assembly is arranged at a first end of a fuel cell 1, and the air outlet assembly is arranged at a second end of the fuel cell 1; a DC/DC module 2 is arranged at a first end of the fuel cell 1, a voltage inspection device 3 is arranged at a second end of the fuel cell 1, and the fuel cell 1 is connected with a control device 4 through the DC/DC module 2; the air inlet assembly comprises an air inlet pipe 5 and an air inlet component, a first inlet 6 and a first outlet 7 are respectively arranged at two ends of the air inlet pipe 5, the air inlet pipe 5 is connected with the fuel cell 1 through the first outlet 7, the air inlet component comprises an air compressor 8, an intercooler 9 and a flowmeter 10 which are sequentially arranged on the air inlet pipe 5 from the first inlet 6 to the first outlet 7, the air compressor 8 is connected with the control device 4 through a motor 11, and the voltage inspection device 3 is connected with the flowmeter 10 and the control device 4; a direct current pressure transmission mode and a high-frequency disturbance mode are arranged in the control device 4, a direct current flow signal value and a composite flow signal value are arranged in the control device 4, and the flow signal value measured by the flowmeter 10 is a real-time flow signal value; in the direct current voltage transmission mode, the real-time flow signal value is equal to the direct current flow signal value; after the real-time flow signal value is equal to the direct-current flow signal value, the control device 4 synchronously starts the high-frequency disturbance mode, and in the high-frequency disturbance mode, the real-time flow signal value is equal to the composite flow signal value; and a direct current/high frequency flow pressure decoupling model is arranged in the control device 4.
In another aspect, the present application provides a control method for an air compressor-based fuel cell impedance measurement system, which includes the following steps:
starting the fuel cell 1, controlling the control device 4 to input direct current to the motor 11, driving the air compressor 8 by the motor 11 to work and providing compressed air for the fuel cell 1, measuring a real-time flow signal value of the fuel cell 1 by the flowmeter 10, and measuring a real-time pressure value of the fuel cell 1 by the second pressure and temperature sensor;
when the real-time flow signal value is equal to the direct-current flow signal value, the control device 4 controls the synchronous input of high-frequency current to the motor 11 and controls the compressor until the real-time flow signal value is equal to the composite flow signal value;
sending the real-time flow signal value and the real-time pressure value to a control device 4, and obtaining an impedance value of an electrochemical reaction medium through decoupling analysis of a direct current/high frequency flow pressure decoupling model;
and analyzing and correcting the state of the fuel cell 1 according to the impedance value of the electrochemical reaction medium.
Example 1:
fig. 1 shows an embodiment of the air compressor-based fuel cell impedance measurement system according to the present application.
This application is based on fuel cell 1's air supply equipment setting, and air compressor carries out the processing of stepping up to the air in air supply equipment in order to reach into heap target pressure to input compressed air into fuel cell 1, the air can react in fuel cell 1, and the remaining air of final reaction can be discharged through the backpressure valve of cathode side exit, and its accessible changes the aperture of valve and adjusts the gas flow resistance, reaches the pressure of adjustment galvanic pile cathode chamber inside with this. It can be seen that both the air compressor and the back pressure valve can affect the pressure and flow rate of the fuel cell 1, and therefore, the physical disturbance needs to be implemented by adjusting the air compressor or the back pressure valve. In the specific embodiment of the application, an air compressor is adopted to realize physical disturbance.
In the specific embodiment of the present application, the system for measuring the impedance of the electrochemical reaction medium of the fuel cell 1 based on the air compressor is to realize the measurement of the impedance of the electrochemical reaction medium by physically disturbing the fuel cell 1 by the air compressor, and comprises an air inlet assembly and an air outlet assembly, wherein the air inlet assembly is used for inputting air to the fuel cell 1, and the air outlet assembly is used for outputting the residual air to the fuel cell 1 after the air reaction is completed.
The fuel cell system comprises a fuel cell 1, an air inlet assembly, an air outlet assembly, a DC/DC module 2, a voltage inspection device 3 and a control device 4, wherein the air inlet assembly and the air outlet assembly are both arranged on the cathode side of the fuel cell 1, the air inlet assembly is arranged at the first end of the fuel cell 1, the air outlet assembly is arranged at the second end of the fuel cell 1, the first end of the fuel cell 1 is provided with the DC/DC module 2, the DC/DC module 2 is used for boosting or reducing the voltage, the second end of the fuel cell 1 is provided with the voltage inspection device 3, the voltage inspection device 3 is used for measuring the voltage of the fuel cell 1, and the fuel cell 1 is connected with the control device 4 through the DC/DC module 2.
Wherein, the subassembly that admits air includes intake pipe 5 and the part of admitting air, and 5 both ends of intake pipe are provided with first import 6 and first export 7 respectively, and intake pipe 5 links to each other with fuel cell 1 through first export 7, and the part of admitting air includes air compressor 8, intercooler 9 and flowmeter 10, and air compressor 8 passes through motor 11 and links to each other with controlling means 4, and the voltage inspection device links to each other with flowmeter 10 and controlling means 4.
Wherein, a direct current pressure transmission mode and a high-frequency disturbance mode are arranged in the control device 4, a direct current flow signal value and a composite flow signal value are arranged in the control device 4, and the flow signal value measured by the flowmeter 10 is a real-time flow signal value; in the direct current voltage transmission mode, the real-time flow signal value is equal to the direct current flow signal value; after the real-time flow signal value is equal to the direct-current flow signal value, the control device 4 synchronously starts a high-frequency disturbance mode, and under the high-frequency disturbance mode, the real-time flow signal value is equal to the composite flow signal value; a direct current/high frequency flow pressure decoupling model is arranged in the control device 4.
The air compressor 8 applies physical disturbance to the fuel cell 1 by compounding the direct current voltage transmission mode and the high-frequency disturbance mode, and monitors the pressure and flow of the fuel cell 1 to obtain a direct current/high frequency flow pressure signal, then decoupling the direct current/high frequency flow pressure signal by a direct current/high frequency flow pressure decoupling model to obtain a direct current signal and a high frequency alternating current signal, wherein, the direct current signal is used as the input of a general pressure flow decoupling algorithm to carry out normal closed-loop control, the separated high-frequency alternating current signal is used as the input of high-frequency current injection closed-loop control to carry out high-frequency pressure/flow disturbance, and finally, the impedance value of the electrochemical reaction medium is calculated according to the pressure and flow signal value under the high-frequency disturbance, and the state analysis and correction of the fuel cell 1 are performed, and the cathode pressure disturbance frequency meter as low as 0.1HZ can generate the voltage output disturbance of the fuel cell 1.
After the high-frequency flow is injected, the high-frequency flow is divided by the monolithic flow of the galvanic pile measured by the voltage inspection device to obtain the impedance value of the electrochemical reaction medium.
During specific operation, the fuel cell 1 is started firstly, the control device 4 controls the direct current input to the motor 11, the motor 11 drives the air compressor 8 to work, compressed air is led to the fuel cell 1 through the air inlet pipe 5, the flow meter 10 measures the real-time flow signal value of the fuel cell 1 at the moment, and the second pressure and temperature sensor measures the real-time pressure value of the fuel cell 1. When the real-time flow signal value is equal to the direct-current flow signal value, the control device 4 controls the motor 11 to synchronously input high-frequency current, the motor 11 is in a state of compounding the direct current and the high-frequency current at the moment, the compressor is controlled until the real-time flow signal value is equal to the compound flow signal value, the compound flow signal value is the superposition of the direct-current flow signal value and the high-frequency flow signal value, the real-time flow signal value and the real-time pressure value are sent to the control device 4, the electrochemical reaction medium impedance value is obtained through decoupling analysis of the direct-current/high-frequency flow pressure decoupling model, and the state analysis and correction are carried out on the fuel cell 1 according to the electrochemical reaction medium impedance value.
In a specific embodiment of the present application, the dc/high frequency flow pressure decoupling model includes a signal separation unit, a general pressure flow closed-loop control unit, and a high frequency pressure flow closed-loop control unit.
In the specific embodiment of the present application, the air outlet assembly includes an air outlet pipe 12 and an air outlet part, two ends of the air outlet pipe 12 are respectively provided with a second inlet 13 and a second outlet 14, the air outlet pipe 12 is connected with the fuel cell 1 through the second outlet 14, the air inlet part includes an exhaust valve 15 and a first pressure and temperature sensor 16 which are sequentially arranged on the air outlet pipe 12 from the second inlet 13 to the second outlet 14, and the first pressure and temperature sensor 16 and the exhaust valve 15 are connected with the uniform control device 4. The first pressure and temperature sensor 16 is used for detecting the outlet pressure and temperature in the gas pipe 12 in a direct current state or a high-frequency state, and the exhaust valve 15 is used for controlling whether the exhaust pipe exhausts outwards.
In the embodiment of the application, a three-way valve is arranged in the inlet pipe 5 between the flow meter 10 and the intercooler 9, and the three-way valve is connected with the outlet pipe 12 through an intermediate pipe 18 and is connected with the control device 4. The on-off of the three-way valve is used for determining whether to exhaust through the exhaust pipe.
In the embodiment of the present application, a second pressure and temperature sensor 19 is arranged in the intake pipe 5 between the three-way valve and the second outlet 14. The second pressure and temperature sensor 19 is used for detecting the outlet pressure and temperature of the inlet pipe in a direct current state or a high-frequency state. The air compressor 8 can raise the temperature of the air after pressurizing the air, and meanwhile, the moisture in the air is almost evaporated, so that the intercooler 9 is needed to enable the dry air to reach the appropriate humidity, and the appropriate humidity can improve the performance of the fuel cell 1.
In the embodiment of the present application, a silencer 20 is disposed on the intake pipe 5 between the intercooler 9 and the air compressor 8. Because the air compressor 8 adopts a centrifugal pump body, the high-speed rotation of the blades can generate huge noise, so that the comfort of the whole vehicle can be influenced after the fuel cell 1 is installed on the vehicle, and a silencing device 20 needs to be installed for silencing treatment.
In the particular embodiment of the present application, the air compressor 8 is connected to an air filter 21. The air filter 21 is composed of physical filtration that mainly removes particles such as dust and chemical adsorption that mainly strips off harmful gases that are not physically adsorbed and removed. After double purification by the air filter 21, the clean air is sent to the air compressor 8.
Example 2:
the specific embodiment of the present application further provides a control method for an air compressor-based fuel cell impedance measurement system, wherein the control method comprises the following steps:
the fuel cell 1 is started, the control device 4 controls to input direct current to the motor 11, the motor 11 drives the air compressor 8 to work and provides compressed air for the fuel cell 1, the flow meter 10 measures a real-time flow signal value of the fuel cell 1, and the second pressure and temperature sensor measures a real-time pressure value of the fuel cell 1;
when the real-time flow signal value is equal to the direct-current flow signal value, the control device 4 controls the synchronous input of high-frequency current to the motor 11 and controls the compressor until the real-time flow signal value is equal to the composite flow signal value;
sending the real-time flow signal value and the real-time pressure value to a control device 4, and obtaining an impedance value of an electrochemical reaction medium through decoupling analysis of a direct current/high frequency flow pressure decoupling model;
and analyzing and correcting the state of the fuel cell 1 according to the impedance value of the electrochemical reaction medium.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. The fuel cell impedance measuring system based on the air compressor is characterized by comprising an air inlet assembly and an air outlet assembly, wherein the air inlet assembly is arranged at a first end of a fuel cell (1), and the air outlet assembly is arranged at a second end of the fuel cell (1); a DC/DC module (2) is arranged at the first end of the fuel cell (1), a voltage inspection device (3) is arranged at the second end of the fuel cell (1), and the fuel cell (1) is connected with a control device (4) through the DC/DC module (2); the air inlet assembly comprises an air inlet pipe (5) and an air inlet component, a first inlet (6) and a first outlet (7) are respectively arranged at two ends of the air inlet pipe (5), the air inlet pipe (5) is connected with the fuel cell (1) through the first outlet (7), the air inlet component comprises an air compressor (8), an intercooler (9) and a flowmeter (10) which are sequentially arranged on the air inlet pipe (5) from the first inlet (6) to the first outlet (7), the air compressor (8) is connected with the control device (4) through a motor (11), and the voltage inspection device (3) is connected with the flowmeter (10) and the control device (4); a direct current voltage transmission mode and a high-frequency disturbance mode are arranged in the control device (4), a direct current flow signal value and a composite flow signal value are arranged in the control device (4), and the flow signal value measured by the flowmeter (10) is a real-time flow signal value; in the direct current voltage transmission mode, the real-time flow signal value is equal to the direct current flow signal value; after the real-time flow signal value is equal to the direct-current flow signal value, the control device (4) synchronously starts the high-frequency disturbance mode, and in the high-frequency disturbance mode, the real-time flow signal value is equal to the composite flow signal value; and a direct current/high frequency flow pressure decoupling model is arranged in the control device (4).
2. The air compressor based fuel cell AC measurement system of claim 1, wherein the DC/HF flow pressure decoupling model comprises a signal separation unit, a general purpose pressure flow closed loop control unit and a HF pressure flow closed loop control unit.
3. The air compressor-based fuel cell AC measuring system of claim 1, wherein the air outlet assembly comprises an air outlet pipe (12) and an air outlet component, two ends of the air outlet pipe (12) are respectively provided with a second inlet (13) and a second outlet (14), the air outlet pipe (12) is connected with the fuel cell (1) through the second outlet (14), the air inlet component comprises an exhaust valve (15) and a first pressure and temperature sensor (16) which are sequentially arranged on the air outlet pipe (12) from the second inlet (13) to the second outlet (14), and the first pressure and temperature sensor (16) and the exhaust valve (15) are uniformly connected with the control device (4).
4. The air compressor based fuel cell impedance measuring system according to claim 3, wherein a three-way valve is provided on the inlet pipe (5) between the flow meter (10) and the intercooler (9), the three-way valve is connected to the outlet pipe (12) through an intermediate pipe (18), and the three-way valve is connected to the control device (4).
5. The air compressor based fuel cell impedance measuring system according to claim 4, wherein a second pressure and temperature sensor (19) is provided on the intake pipe (5) between the three-way valve and the second outlet (14).
6. The air compressor-based fuel cell impedance measuring system as claimed in claim 1, wherein a silencer (20) is provided at the intake duct (5) between the intercooler (9) and the air compressor (8).
7. The air compressor based fuel cell impedance measuring system of claim 1, wherein the air compressor (8) is connected to an air filter (21).
8. A control method of a fuel cell impedance measuring system based on an air compressor is characterized by comprising the following steps:
the fuel cell (1) is started, the control device (4) controls the direct current input to the motor (11), the motor (11) drives the air compressor (8) to work and provides compressed air for the fuel cell (1), the flow meter (10) measures the real-time flow signal value of the fuel cell (1), and the second pressure and temperature sensor measures the real-time pressure value of the fuel cell (1);
when the real-time flow signal value is equal to the direct-current flow signal value, the control device (4) controls the synchronous input of high-frequency current to the motor (11) and controls the compressor until the real-time flow signal value is equal to the composite flow signal value;
sending the real-time flow signal value and the real-time pressure value to a control device (4), and obtaining an impedance value of an electrochemical reaction medium through decoupling analysis of a direct current/high frequency flow pressure decoupling model;
and analyzing and correcting the state of the fuel cell (1) according to the impedance value of the electrochemical reaction medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210448552.3A CN114636935A (en) | 2022-04-24 | 2022-04-24 | Fuel cell impedance measuring system based on air compressor and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210448552.3A CN114636935A (en) | 2022-04-24 | 2022-04-24 | Fuel cell impedance measuring system based on air compressor and control method |
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| Publication Number | Publication Date |
|---|---|
| CN114636935A true CN114636935A (en) | 2022-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210448552.3A Pending CN114636935A (en) | 2022-04-24 | 2022-04-24 | Fuel cell impedance measuring system based on air compressor and control method |
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| CN (1) | CN114636935A (en) |
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2022
- 2022-04-24 CN CN202210448552.3A patent/CN114636935A/en active Pending
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