CN114636934A - Fuel cell impedance measuring system based on throttle valve and control method - Google Patents
Fuel cell impedance measuring system based on throttle valve and control method Download PDFInfo
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- CN114636934A CN114636934A CN202210448551.9A CN202210448551A CN114636934A CN 114636934 A CN114636934 A CN 114636934A CN 202210448551 A CN202210448551 A CN 202210448551A CN 114636934 A CN114636934 A CN 114636934A
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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 a throttle valve, wherein the fuel cell impedance measuring system comprises an air inlet component and an air outlet component which are connected with a fuel cell, and under a direct current pressure transmission mode, a real-time pressure signal value is equal to a direct current pressure signal value; after the real-time pressure signal value is equal to the direct-current pressure signal value, the control device synchronously starts the high-frequency disturbance mode, and the real-time pressure signal value is equal to the composite pressure 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 fuel cell electrochemical reaction medium impedance measuring system based on the throttle valve and the control method thereof are provided, wherein the high-frequency physical disturbance is applied to the cathode measurement of the fuel cell through the throttle valve, and the pressure flow signal is decoupled through a direct current/high-frequency flow pressure decoupling model.
Description
Technical Field
The present application relates to the field of fuel cells, and in particular, to a fuel cell impedance measurement system and a control method based on a throttle.
Background
In recent years, fossil energy is gradually minimized in the world, and hydrogen energy is an important research direction for new energy transformation, has a strong industrial development momentum and becomes a focus of accumulated power in various countries, and becomes an important development target in energy revolution due to its environmental protection and ubiquitous advantages. The development of hydrogen energy will promote the progress of fuel cells, the impedance function of the electrochemical reaction medium is a key method for monitoring the internal state of the fuel cells at present, and the operation state of the fuel cells 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 cells.
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 the oxygen transmission characteristic frequency and the electrochemical characteristic frequency cannot be decoupled through the detection of the impedance state of the existing electrochemical reaction medium in the prior art, and effective impedance information cannot be extracted under low disturbance frequency.
In order to solve the technical problems and achieve the above-mentioned object, the present application provides a throttle-based fuel cell impedance measuring system, which is characterized by comprising an air inlet assembly and an air outlet assembly connected to a fuel cell, wherein a DC/DC module is disposed at a first end of the fuel cell, a voltage inspection device is disposed at a second end of the fuel cell, and the fuel cell is connected to a control device through the DC/DC module; the air inlet assembly comprises an air compressor, a throttle valve and a first pressure temperature sensor, the air compressor is connected with the control device through a motor, and the voltage inspection device, the throttle valve and the first pressure temperature sensor are all connected with the control device; a direct current pressure transmission mode and a high-frequency disturbance mode are arranged in the control device, a direct current pressure signal value and a composite pressure signal value are arranged in the control device, and a pressure signal measured by the first pressure and temperature sensor is a real-time pressure signal; in the direct current pressure transmission mode, the real-time pressure signal value is equal to the direct current pressure signal value; after the real-time pressure signal value is equal to the direct-current pressure signal value, the control device synchronously starts the high-frequency disturbance mode, and the real-time pressure signal value is equal to the composite pressure 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 an implementation mode, the air inlet assembly is arranged at a first end of the fuel cell, the air outlet assembly is arranged at a second end of the fuel cell, the air inlet assembly further comprises an air inlet pipe, 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, and the air inlet pipe is sequentially provided with an air compressor, a throttle valve and a first pressure and temperature sensor from the first inlet to the first outlet.
In an implementation manner, the direct current/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, the two ends of the air outlet pipe are respectively provided with a second inlet and a second outlet, the air outlet pipe is connected with the fuel cell through the second outlet, the air inlet part comprises an exhaust valve and a second temperature sensor, the second inlet is arranged on the air outlet pipe, the second outlet is sequentially arranged on the exhaust valve, and the second temperature sensor and the exhaust valve are uniform.
In one embodiment, a flow meter is provided in the intake pipe between the throttle valve and the second outlet.
In one embodiment, an intercooler is provided in the intake pipe between the throttle valve and the air compressor.
In one embodiment, the throttle valve is connected to the exhaust valve via an intermediate pipe.
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 above technical problems and achieve the above object, the present application further provides a control method for a throttle-based fuel cell electrochemical reaction medium impedance measuring system, comprising the steps of:
starting the fuel cell, controlling the control device to input normal pulse to the throttle valve, enabling the throttle valve to work and providing compressed air to the fuel cell, measuring a real-time pressure signal value of the fuel cell by the first pressure and temperature sensor, and measuring a real-time flow signal value of the fuel cell by the flowmeter;
when the real-time pressure value is equal to the direct-current pressure signal value, the control device controls to synchronously input high-frequency pulses to the throttle valve and controls the throttle valve until the real-time pressure signal value is equal to the composite pressure signal value;
sending the real-time pressure 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 impedance measuring system based on the throttle valve has the following beneficial effects:
the throttle valve applies physical disturbance to the fuel cell in a mode 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 application 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. a throttle valve; 10. a first pressure temperature sensor; 11. a motor; 12. an air outlet pipe; 13. a second inlet; 14. a second outlet; 15. an exhaust valve; 16. a second temperature sensor; 17. a flow meter; 18. an intercooler; 19. an intermediate pipe; 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.
To this end, in one aspect, the present application provides a throttle-based fuel cell impedance measuring system, including an air inlet assembly and an air outlet assembly connected to a fuel cell 1, a DC/DC module is provided at a first end of the fuel cell 1, a voltage polling device 3 is provided at a second end of the fuel cell 1, and the fuel cell 1 is connected to a control device 4 through the DC/DC module; the air intake assembly comprises an air compressor 8, a throttle valve 9 and a first pressure and temperature sensor 10, the air compressor 8 is connected with the control device 4 through a motor 11, and the voltage inspection device 3, the throttle valve 9 and the first pressure and temperature sensor 10 are all connected with 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 pressure signal value and a composite pressure signal value are arranged in the control device 4, and a pressure signal measured by the first pressure and temperature sensor 10 is a real-time pressure signal; in the direct current pressure transmission mode, the real-time pressure signal value is equal to the direct current pressure signal value; after the real-time pressure signal value is equal to the direct-current pressure signal value, the control device 4 synchronously starts the high-frequency disturbance mode, and in the high-frequency disturbance mode, the real-time pressure signal value is equal to the composite pressure 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 a throttle-based fuel cell impedance measuring system, including the steps of:
starting the fuel cell 1, controlling the control device 4 to input normal pulses to the throttle valve 9, operating the throttle valve 9 and providing compressed air to the fuel cell 1, measuring a real-time pressure signal value of the fuel cell 1 by the first pressure and temperature sensor 10, and measuring a real-time flow signal value of the fuel cell 1 by the flowmeter 17;
when the real-time pressure value is equal to the direct-current pressure signal value, the control device 4 controls the high-frequency pulse to be synchronously input to the throttle valve and controls the throttle valve until the real-time pressure signal value is equal to the composite pressure signal value;
sending the real-time pressure 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 illustrates one embodiment of a throttle-based fuel cell impedance measurement system of the present application.
According to the air supply equipment based on the fuel cell, the air compressor is arranged in the air supply equipment to boost the air and the throttle valve so as to achieve the target pressure of stack entering, compressed air is input into the fuel cell 1, the air can react in the fuel cell 1, finally, the residual air after reaction can be discharged through the backpressure valve at the outlet of the cathode side, the air flow resistance can be adjusted by changing the opening and closing of the throttle valve and the backpressure valve, and therefore the pressure inside the cathode cavity of the galvanic pile can be adjusted. It can be seen that both the air compressor and the throttle can affect the pressure and flow rate of the fuel cell 1, and therefore need to be adjusted by adjusting the air compressor or the throttle when physical disturbances occur. A throttle is employed in the specific embodiment of the present application to achieve the physical disturbance.
In the specific embodiment of the application, the throttle-based fuel cell electrochemical reaction medium impedance measuring system realizes measurement of electrochemical reaction medium impedance by physically disturbing the fuel cell 1 through a gas-releasing method, 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 residual air out of the fuel cell 1 after 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.
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 18, a throttle valve and a flow meter 17, the air compressor 8 is connected with the control device 4 through a motor 11, and the voltage inspection device 3 and the throttle valve are connected with the flow meter 17 and the control device 4.
Wherein, a direct current pressure transmission mode and a high frequency disturbance mode are arranged in the control device 4, a direct current pressure signal value and a composite pressure signal value are arranged in the control device 4, and the pressure signal value measured by the first pressure temperature sensor 10 is a real-time pressure signal value; in the direct current pressure transmission mode, the real-time pressure signal value is equal to the direct current pressure signal value; after the real-time pressure signal value is equal to the direct-current pressure signal value, the control device 4 synchronously starts a high-frequency disturbance mode, and under the high-frequency disturbance mode, the real-time pressure signal value is equal to the composite pressure signal value; a direct current/high frequency flow pressure decoupling model is arranged in the control device 4.
The throttle valve applies physical disturbance to the fuel cell 1 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 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 pressure is injected, the impedance value of the electrochemical reaction medium is obtained by dividing the pressure of the electrically-pushed single chip measured by the voltage inspection device by the high-frequency pressure.
In the specific operation, the fuel cell 1 is started firstly, meanwhile, the control device 4 controls to input normal pulses to the throttle valve 9 to drive the throttle valve to work normally, and compressed air is led to the fuel cell 1 through the air inlet pipe 5, at the moment, the first pressure and temperature sensor 10 measures the real-time pressure signal value of the fuel cell 1, and the flowmeter 17 measures the real-time flow value of the fuel cell 1. When the real-time pressure signal value is equal to the direct-current pressure signal value, the control device 4 controls the motor 11 to synchronously input high-frequency pulses, the throttle valve is in a state of compounding direct current and high-frequency current at the moment and controls the throttle valve until the real-time pressure signal value is equal to the compound pressure signal value, the compound pressure signal value is obtained by superposing the direct-current pressure signal value and the high-frequency pressure signal value, the real-time pressure signal value and the real-time flow signal value are sent to the control device 4, the electrochemical reaction medium impedance value is obtained through decoupling analysis of a direct-current/high-frequency flow pressure decoupling model, and the state of the fuel cell 1 is analyzed and corrected 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 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 to the fuel cell 1 through the second outlet 14, the air inlet part includes an exhaust valve 15 and a second 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 second temperature sensor 16 and the exhaust valve 15 are connected to the uniformity control device 4. The second temperature sensor 16 is used for detecting the outlet pressure and temperature in the air pipe 12, and the exhaust valve 15 is used for controlling whether the exhaust pipe exhausts the air outwards.
In the embodiment of the present application, a flow meter 17 is provided in the intake pipe 5 between the throttle valve and the second outlet 14.
In the embodiment of the present application, an intercooler 18 is provided in the intake pipe 5 between the throttle valve and the air compressor 8. After the air is compressed by the air compressor, the temperature of the air rises, and the moisture in the air is almost evaporated, so that the intercooler 18 is required to make the dry air reach a suitable humidity, and the performance of the fuel cell 1 is improved by the suitable humidity.
In the embodiment of the application, the throttle flap 9 is connected to the exhaust valve 15 via an intermediate pipe 19.
In the embodiment of the present application, a silencer 20 is provided in the intake pipe 5 between the intercooler 18 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 present application further provides a control method for a throttle-based fuel cell impedance measurement system, including the steps of:
the fuel cell 1 is started, the control device 4 controls to input normal pulses to the throttle valve 9, the throttle valve 9 works and provides compressed air to the fuel cell 1, the first pressure and temperature sensor 10 measures the real-time pressure signal value of the fuel cell 1, and the flowmeter 17 measures the real-time flow signal value of the fuel cell 1;
when the real-time pressure value is equal to the direct-current pressure signal value, the control device 4 controls the high-frequency pulse to be synchronously input to the throttle valve and controls the throttle valve until the real-time pressure signal value is equal to the composite pressure signal value;
sending the real-time pressure 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 such 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 (10)
1. A throttle valve-based fuel cell impedance measuring system is characterized by comprising an air inlet assembly and an air outlet assembly which are connected with a fuel cell, wherein a DC/DC module (2) is arranged at a first end of the fuel cell (1), a voltage patrol 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 compressor (8), a throttle valve (9) and a first pressure temperature sensor (10), the air compressor (8) is connected with the control device (4) through a motor (11), and the voltage inspection device (3), the throttle valve (9) and the first pressure temperature sensor (10) are connected with 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 pressure signal value and a composite pressure signal value are arranged in the control device (4), and a pressure signal measured by the first pressure and temperature sensor (10) is a real-time pressure signal; in the direct current pressure transmission mode, the real-time pressure signal value is equal to the direct current pressure signal value; after the real-time pressure signal value is equal to the direct-current pressure signal value, the control device (4) synchronously starts the high-frequency disturbance mode, and in the high-frequency disturbance mode, the real-time pressure signal value is equal to the composite pressure signal value; and a direct current/high frequency flow pressure decoupling model is arranged in the control device (4).
2. The throttle valve-based fuel cell impedance measuring system according to claim 1, wherein the air inlet assembly is arranged at a first end of the fuel cell (1), the air outlet assembly is arranged at a second end of the fuel cell (2), the air inlet assembly further comprises an air inlet pipe (5), 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 through the first outlet (7), and the air inlet pipe (5) is sequentially provided with an air compressor (8), a throttle valve (9) and a first pressure-temperature sensor (10) from the first inlet (6) to the first outlet (7).
3. The throttle-based fuel cell impedance measurement system of claim 1, wherein the dc/hf flow pressure decoupling model comprises a signal separation unit, a common pressure-flow closed-loop control unit, and an hf pressure-flow closed-loop control unit.
4. The throttle valve-based fuel cell impedance measuring system according to claim 2, wherein the air outlet assembly comprises an air outlet pipe (12) and an air outlet part, a second inlet (13) and a second outlet (14) are respectively arranged at two ends of the air outlet pipe (12), the air outlet pipe (12) is connected with the fuel cell (1) through the second outlet (14), the air inlet part comprises an exhaust valve (15) and a second 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 second temperature sensor (16) and the exhaust valve (15) are uniformly connected with the control device.
5. The throttle valve based fuel cell impedance determination system according to claim 4, wherein a flow meter (17) is provided on the intake pipe (5) between the throttle valve (9) and the second outlet (14).
6. A throttle valve based fuel cell impedance determination system according to claim 5, characterized in that an intercooler (18) is provided in the intake pipe (5) between the throttle valve (9) and the air compressor (8).
7. The throttle-based fuel cell impedance determination system according to claim 4, wherein the throttle valve (9) is connected to the exhaust valve (15) through an intermediate pipe (19).
8. The throttle-based fuel cell impedance measurement system according to claim 2, wherein a muffler device (20) is provided in the intake pipe (5) between the intercooler (18) and the air compressor (8).
9. The throttle-based fuel cell impedance measurement system of claim 1, wherein the air compressor (8) is connected to an air filter (21).
10. A control method for a throttle-based fuel cell impedance measurement system, comprising the steps of:
the fuel cell (1) is started, the control device (4) controls to input normal pulses to the throttle valve (9), the throttle valve (9) works and provides compressed air to the fuel cell (1), the first pressure and temperature sensor (10) measures the real-time pressure signal value of the fuel cell (1), and the flow meter (17) measures the real-time flow signal value of the fuel cell (1);
when the real-time pressure value is equal to the direct-current pressure signal value, the control device (4) controls to synchronously input high-frequency pulses to the throttle valve (9) and controls the throttle valve (9) until the real-time pressure signal value is equal to the composite pressure signal value;
sending the real-time pressure 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 |
|---|---|---|---|
| CN202210448551.9A CN114636934A (en) | 2022-04-24 | 2022-04-24 | Fuel cell impedance measuring system based on throttle valve and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210448551.9A CN114636934A (en) | 2022-04-24 | 2022-04-24 | Fuel cell impedance measuring system based on throttle valve and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114636934A true CN114636934A (en) | 2022-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210448551.9A Pending CN114636934A (en) | 2022-04-24 | 2022-04-24 | Fuel cell impedance measuring system based on throttle valve and control method |
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| Country | Link |
|---|---|
| CN (1) | CN114636934A (en) |
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2022
- 2022-04-24 CN CN202210448551.9A patent/CN114636934A/en active Pending
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