A detection system and detection method for a hydrogen injector of a fuel cell

Abstract

The present application relates to the field of hydrogen fuel cells, and discloses a detection system for a fuel cell hydrogen injector, including a fuel cell anode simulation cavity, an intake line and an exhaust line. The fuel cell anode simulation cavity is respectively connected to the intake line and the exhaust line to form a flow line for hydrogen; a hydrogen injector is detachably arranged on the intake line, and the host computer is connected to the hydrogen injector through a control device. The control device is used to control the duty cycle of the hydrogen ejected by the hydrogen injector. Standard duty cycle data under the rated output air pressure is set in the host computer. A first pressure sensor for detecting the actual output air pressure is arranged at the outlet end of the hydrogen injector, and the first pressure sensor is connected to the control device. The rated output air pressure is set in the control device. There is provided a detection system that can test the actual output air pressure of the hydrogen injector to screen out the hydrogen injector whose actual output air pressure is within the rated output air pressure range under the standard duty cycle.

Description

Technical Field

[0001] The present application relates to the field of hydrogen fuel cells, and in particular to a detection system and a detection method for a fuel cell hydrogen injector. Background Art

[0002] A fuel cell is an energy conversion device that converts the chemical energy stored in the fuel and oxidant directly into electrical energy isothermally based on the electrochemical principle, that is, the working principle of the primary cell. Therefore, the actual process is a redox reaction.

[0003] The working principle of the fuel cell power generation system is the reverse reaction of water electrolysis. During use, fuel and oxygen need to be provided to the fuel cell. For the fuel cell system to generate electricity continuously, it needs to continuously provide fuel and oxygen with a certain pressure and flow rate. It is very important to control the balance between the anode fuel supply pressure and the cathode oxygen supply pressure, because one of the main forms of failure of the proton exchange membrane fuel cell membrane is mechanical failure. Mechanical failure mainly includes manufacturing defects, humidity effects, temperature effects, and pressure effects. Among them, the pressure influencing factors refer to pressure imbalance and excessive absolute pressure. At present, hydrogen injectors are mostly used for the anode fuel supply of fuel cells.

[0004] As the power of fuel cell systems increases, one hydrogen injector can no longer meet usage requirements. Currently, the anode of a fuel cell usually uses multiple hydrogen injectors.

[0005] In order to ensure the pressure balance of the fuel cell anode, the most effective way is to keep the actual output pressure of each hydrogen injector consistent. The actual output pressure of the fuel cell is usually adjusted by controlling the duty cycle of the hydrogen ejected by the hydrogen injector.

[0006] Therefore, how to test the actual output pressure of the hydrogen injector to screen out standard hydrogen injectors whose actual output pressure is within the rated output pressure range under a standard duty cycle is a technical problem to be solved in this application. Summary of the invention

[0007] The present application mainly solves the technical problem in the prior art that each hydrogen injector cannot ensure the consistency of the actual output pressure, and provides a detection system that can test the actual output pressure of the hydrogen injector to screen out the hydrogen injectors whose actual output pressure is within the rated output pressure range under the standard duty cycle.

[0008] To solve the above technical problems and achieve the above application objectives, on the one hand, the present application provides a detection system for a hydrogen injector of a fuel cell, which is characterized by including a fuel cell anode simulation cavity, an intake line and an exhaust line. The fuel cell anode simulation cavity is respectively connected to the intake line and the exhaust line to form a hydrogen flow line; a hydrogen injector is detachably arranged on the intake line, and an upper computer is connected to the hydrogen injector through a control device. The control device is used to control the duty cycle of the hydrogen ejected by the hydrogen injector. The upper computer is provided with standard duty cycle data under the rated output air pressure. A first pressure sensor for detecting the actual output air pressure is arranged at the outlet end of the hydrogen injector. The first pressure sensor is connected to the control device, and the rated output air pressure is set in the control device.

[0009] Wherein, a storage device is arranged in the control device, and the storage device is used to store the actual duty cycle data of each hydrogen injector reaching the rated output air pressure.

[0010] Wherein, the exhaust line includes a first branch and a second branch. The first branch is used to simulate the actual consumption of hydrogen in the fuel cell, and the second branch is used to simulate the exhaust consumption of hydrogen in the fuel cell. The second branch is connected to the intake line through a return line to form a circulating flow line.

[0011] Wherein, an ejector is arranged on one side of the hydrogen injector close to the fuel cell anode simulation cavity, and a pressure reducing valve is arranged on one side of the hydrogen injector far from the fuel cell anode simulation cavity. A safety valve and a first gas flowmeter are sequentially arranged between the pressure reducing valve and the hydrogen injector along the flow direction.

[0012] Wherein, a second pressure sensor is arranged at the inlet end of the hydrogen injector. The second pressure sensor is connected to the control device, and the second pressure sensor is used to detect the fluid pressure before entering the hydrogen injector.

[0013] Wherein, a third pressure sensor is arranged between the ejector and the fuel cell anode simulation cavity. The third pressure sensor is used to detect the fluid pressure before entering the fuel cell anode simulation cavity.

[0014] Wherein, a second gas flowmeter is arranged on the return line.

[0015] Wherein, a back pressure valve and an exhaust valve are sequentially arranged on the second branch along the gas flow direction. A fourth pressure sensor is arranged between the back pressure valve and the exhaust valve. The fourth pressure sensor and the exhaust valve are connected to the control device.

[0016] Among them, a flow control device is provided on the first branch, and the flow control device is connected to the control device.

[0017] On the other hand, the present application provides a detection method for the detection system of the fuel cell hydrogen injector as described in Embodiment 1, which is characterized by including the following steps:

[0018] According to the rated input air pressure required by the anode of the fuel cell, calculate the rated output air pressure of each hydrogen injector, and calculate the standard duty cycle data according to the rated output air pressure of the hydrogen injector;

[0019] Number each hydrogen injector;

[0020] The control device retrieves the standard duty cycle data at the rated output air pressure in the upper computer, and the control device controls the hydrogen injector to inject hydrogen with this standard duty cycle data as an instruction;

[0021] The first pressure sensor detects the actual output air pressure at the outlet end of the hydrogen injector and compares it with the rated output air pressure in the control device;

[0022] If the actual output air pressure of the hydrogen injector is within the range of the rated output air pressure, then this hydrogen injector is a standard hydrogen injector, so that the actual output air pressure can be kept consistent with that of the other hydrogen injectors during use;

[0023] If the actual output air pressure of the hydrogen injector is not within the range of the rated output air pressure, then this hydrogen injector adjusts the actual output air pressure by further adjusting the duty cycle of the ejected hydrogen until the actual output air pressure is within the range of the rated output air pressure, so that the actual output air pressure can be kept consistent with that of the standard hydrogen injector during use;

[0024] The storage device stores the duty cycle of the ejected hydrogen when the actual output air pressure of each hydrogen injector is within the range of the rated output air pressure.

[0025] Compared with the prior art, the detection system and its control method of the fuel cell hydrogen injector of the present application have the following beneficial effects:

[0026] 1. Simulate the working environment of the hydrogen injector by inputting anode fuel into the anode simulation cavity of the fuel cell through the intake line, then outputting through the outlet line, and setting a hydrogen injector on the intake line.

[0027] 2. In the initial state, the control device retrieves the standard duty cycle data from the host computer, and uses this standard duty cycle data as an instruction to control the hydrogen injector to inject hydrogen. Then, at the outlet end of the hydrogen injector, the actual output air pressure is detected by the first pressure sensor, and the detected actual output air pressure is sent to the control device. The control device compares the rated output air pressure with the actual output air pressure. If the actual output air pressure of the hydrogen injector is within the range of the rated output air pressure, it is determined that the hydrogen injector belongs to the standard hydrogen injector. The standard hydrogen injectors are screened and applied to the fuel cell, which is beneficial to maintaining the pressure balance of the anode of the fuel cell.

[0028] 3. If the actual output air pressure of the hydrogen injector is not within the range of the rated output air pressure, the control device adjusts the duty cycle of the hydrogen injector until the actual output air pressure meets the rated output air pressure, and stores the duty cycle data of the hydrogen injector when the actual output air pressure is within the range of the rated output air pressure through the storage device, so that non-standard hydrogen injectors can also be used.

[0029] Therefore, the present application has the characteristics of reasonable structure and convenient use. Brief Description of the Drawings

[0030] Attached Figure 1 is a circuit schematic diagram of the present application.

[0031] Explanation of the reference numerals in the figure: 1. Fuel cell anode simulation cavity; 2. Intake line; 3. Pressure reducing valve; 4. Hydrogen injector; 5. Host computer; 6. Control device; 7. First pressure sensor; 8. Storage device; 9. First branch; 10. Second branch; 11. Ejector; 12. Safety valve; 13. First gas flowmeter; 14. Second pressure sensor; 15. Third pressure sensor; 16. Second gas flowmeter; 17. Back pressure valve; 18. Exhaust valve; 19. Fourth pressure sensor; 20. Flow control device; 21. Return line. Detailed Embodiments

[0032] To make the objectives, 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 in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0033] In the prior art, in order to ensure the pressure balance of the fuel cell anode, the most effective way is to keep the actual output pressure of each hydrogen injector 4 consistent, and the actual output pressure of the fuel cell is usually adjusted by controlling the duty cycle of the hydrogen injector 4 spraying hydrogen.

[0034] Therefore, how to test the actual output pressure of the hydrogen injector 4 to select the standard hydrogen injectors 4 whose actual output pressure is within the rated output pressure range under the standard duty cycle is a technical problem to be solved in this application.

[0035] To this end, on the one hand, the present application provides a detection system for a fuel cell hydrogen injector 4, characterized in that it includes a fuel cell anode simulation cavity 1, an air intake line 2 and an air outlet line, the fuel cell anode simulation cavity 1 is respectively connected to the air intake line 2 and the air outlet line to form a flow line of hydrogen; the air intake line 2 is detachably provided with a hydrogen injector 4, a host computer 5 is connected to the hydrogen injector 4 through a control device 6, the control device 6 is used to control the duty cycle of the hydrogen ejected by the hydrogen injector 4, the host computer 5 is provided with standard duty cycle data under the rated output pressure, the outlet end of the hydrogen injector 4 is provided with a first pressure sensor 7 for detecting the actual output pressure, the first pressure sensor 7 is connected to the control device 6, and the control device 6 is provided with the rated output pressure.

[0036] On the other hand, the present application provides a detection method of the detection system of the fuel cell hydrogen injector 4 as described in Example 1, characterized in that it comprises the following steps:

[0037] Calculate the rated output pressure of each hydrogen injector 4 according to the rated input pressure required by the anode of the fuel cell, and calculate the standard duty cycle data according to the rated output pressure of the hydrogen injector 4;

[0038] Numbering each hydrogen injector 4;

[0039] The control device 6 retrieves the standard duty cycle data under the rated output pressure from the host computer 5, and the control device 6 controls the hydrogen injector 4 to inject hydrogen using the standard duty cycle data as an instruction;

[0040] The first pressure sensor 7 detects the actual output pressure at the outlet of the hydrogen injector 4 and compares it with the rated output pressure in the control device 6;

[0041] If the actual output pressure of the hydrogen injector 4 is within the range of the rated output pressure, the hydrogen injector 4 is a standard hydrogen injector 4, so that the actual output pressure can be consistent with that of other hydrogen injectors 4 when in use;

[0042] If the actual output pressure of the hydrogen injector 4 is not within the range of the rated output pressure, the hydrogen injector 4 further adjusts the actual output pressure by adjusting the duty cycle of the hydrogen ejected until the actual output pressure is within the range of the rated output pressure, thereby maintaining the consistency of the actual output pressure with the standard hydrogen injector 4 during use;

[0043] The storage device 8 stores the duty ratio of the hydrogen injected when the actual output pressure of each hydrogen injector 4 is within the rated output pressure range.

[0044] Embodiment 1:

[0045] Figure 1 An embodiment of a detection system for a fuel cell hydrogen injector 4 of the present application is shown.

[0046] Please refer to Figure 1 The embodiment of the present application shows a detection system for a fuel cell hydrogen injector 4, which is used to detect the actual output pressure of the hydrogen injector 4 under a standard duty cycle, and screen the standard hydrogen injectors 4 whose actual output pressure under the standard duty cycle is below the rated output pressure. Multiple standard hydrogen injectors 4 are used to provide fuel to the fuel cell anode, and keeping the actual output pressure of each hydrogen injector 4 consistent is the most effective way to maintain the pressure balance of the fuel cell anode. For this reason, the screened standard hydrogen injectors 4 are used as the fuel supply source for the fuel cell anode, which can ensure the pressure balance of the fuel cell anode.

[0047] Among them, including detection housing, such as Figure 1 The solid line portion shows an air inlet line 2 and an air outlet line, wherein the air outlet line includes: Figure 1 The first branch 9 shown by the double-dotted line and the Figure 1 However, in the second branch 10 shown by the dotted line, a fuel cell anode simulation cavity 1 is arranged in the detection shell, and an air inlet hole and an air outlet hole are arranged on the detection shell, wherein the air inlet hole and the air outlet hole are not allowed to be arranged on the same side of the detection shell, and the fuel cell anode simulation cavity 1 is connected with the outside only through the air inlet hole and the air outlet hole, and the air inlet line 2 is connected with the detection shell through the air inlet hole to realize the connection between the air inlet line 2 and the fuel cell anode simulation cavity, and the air outlet line is connected with the detection shell through the air outlet hole to realize the connection between the air outlet line and the fuel cell anode simulation cavity, and the anode fuel enters from the air inlet line 2, passes through the fuel cell anode simulation cavity, and flows out from the air outlet line to form a flow path of hydrogen.

[0048] Among them, a hydrogen injector 4 is arranged on the intake line 2. In a preferred state, the hydrogen injector 4 is detachably connected to the intake line 2. Common detachable methods include threaded connection and bolt connection, so that the detection system can detect multiple hydrogen injectors 4.

[0049] Among them, the host computer 5 is connected to the hydrogen injector 4 through the control device 6. The control device 6 is used to control the duty cycle of the hydrogen ejected by the hydrogen injector 4. The host computer 5 is provided with standard duty cycle data under the rated output air pressure. That is to say, when the hydrogen ejected by the hydrogen injector reaches the standard duty cycle data under the design conditions, its actual output air pressure should be within the range of the rated output air pressure. When the models of the hydrogen injectors 4 are different, their rated output air pressures are also different. Therefore, multiple sets of rated output air pressures and standard duty cycle data are stored in the host computer 5. A first pressure sensor 7 for detecting the actual output air pressure of the hydrogen injector 4 is arranged at the outlet end of the hydrogen injector 4. The first pressure sensor 7, the hydrogen injector 4 and the fuel cell anode simulation cavity 1 are connected in series through an intake pipe. The first pressure sensor 7 is connected to the control device 6 and is used to send the actual output air pressure detected by the first pressure sensor 7 to the control device 6. The control device 6 is provided with a rated output air pressure, and the rated output air pressure changes according to the model of the hydrogen injector 4.

[0050] Among them, the specific screening method for the standard hydrogen injector 4 is as follows: the control device 6 retrieves the standard duty cycle data of the corresponding model hydrogen injector 4 in the host computer 5, and uses the standard duty cycle data as an instruction to control the hydrogen injector 4 to eject hydrogen. Then, a first pressure sensor is arranged at the outlet end of the hydrogen injector 4. The actual output air pressure is detected by the first pressure sensor 7 and sent to the control device 6. The control device 6 compares the rated output air pressure with the actual output air pressure. If the actual output air pressure of the hydrogen injector 4 is within the range of the rated output air pressure, it is determined that the hydrogen injector 4 belongs to the standard hydrogen injector 4. The standard hydrogen injectors 4 are screened and applied to the fuel cell, which is beneficial to maintaining the pressure balance of the fuel cell anode.

[0051] In the embodiment of the present application, a storage device 8 is arranged in the control device 6. The storage device 8 is used to store the actual duty cycle data of each hydrogen injector 4 when it reaches the rated output air pressure.

[0052] In the screening of the standard hydrogen injectors 4, there must be some hydrogen injectors 4 whose actual output air pressures under the standard duty cycle are not within the range of the rated output air pressure. We call this part of the hydrogen injectors non-standard hydrogen injectors. In order to ensure that the non-standard hydrogen injectors 4 can continue to be used, it is necessary to calculate the actual duty cycle data of this part of the hydrogen injectors 4 when they reach the rated output air pressure, so as to realize the multi-level utilization of the hydrogen injectors 4.

[0053] Among them, there are many reasons for the non-standard hydrogen injectors. It may be that the intake pipe connecting the hydrogen injector is damaged, or it may be caused by the aging of the hydrogen injector itself.

[0054] Among them, the specific screening method of the non-standard hydrogen injector 4 is: if the actual output pressure of the hydrogen injector 4 is not within the range of the rated output pressure, the duty cycle of the hydrogen injector 4 is adjusted and controlled by the control device 6 until the actual output pressure is within the range of the rated output pressure, and the duty cycle data of the hydrogen injector 4 when the actual output pressure of the hydrogen injector 4 is within the range of the rated output pressure is stored by the storage device 8, so that the non-standard hydrogen injector 4 can also be used.

[0055] In the embodiments of the present application, the consumption of anode fuel in an actual fuel cell includes two aspects: one is the actual consumption of anode fuel, and the other is the exhaust consumption of anode fuel, wherein the actual consumption data and the exhaust consumption data are obtained based on the fuel cell design data, and the actual consumption data and the exhaust consumption data of each type of hydrogen injector 4 are stored in the control device 6. The working environment of the hydrogen injector 4 is highly simulated by setting the first branch 9 and the second branch 10. The first branch 9 is used to simulate the actual consumption of fuel cell hydrogen, and the second branch 10 is used to simulate the exhaust consumption of fuel cell hydrogen. The second branch 10 is connected to the intake line 2 through the reflux line 21 to form a circulating flow line.

[0056] Among them, a back pressure valve 17 and an exhaust valve 18 are arranged in sequence on the second branch 10 along the gas flow direction, and a fourth pressure sensor 19 is arranged between the back pressure valve 17 and the exhaust valve 18. The fuel cell anode simulation cavity 1, the back pressure valve 17, the fourth pressure sensor 19 and the exhaust valve 18 are connected in series through an outlet pipe in sequence. The fourth pressure sensor 19 and the exhaust valve 18 are connected to the control device 6. The control device 6 calls up the hydrogen exhaust consumption of the hydrogen injector 4 of this model to control the hydrogen discharge amount of the exhaust valve 18. The fourth pressure sensor 19 is used to detect whether the air pressure on the second branch 10 is stable.

[0057] The first branch 9 is provided with a flow control device 20 , which is connected to the control device 6 . The control device 6 retrieves the actual hydrogen consumption of the hydrogen injector 4 of this model to control the hydrogen exhaust volume of the flow control device 20 .

[0058] In an embodiment of the present application, an ejector 11 is provided on the side of the hydrogen injector 4 close to the fuel cell anode simulation cavity 1, and a pressure reducing valve 3 is provided on the side of the hydrogen injector 4 away from the fuel cell anode simulation cavity 1. A safety valve 12 and a first gas flow meter 13 are sequentially provided between the pressure reducing valve 3 and the hydrogen injector 4 along the flow direction, so as to highly simulate the use environment of the hydrogen injector 4. The first gas flow meter 13 is connected to the control device 6 to realize gas flow monitoring on the intake line 2. The reason why the gas flow on the intake line requires a keyhole is because if continuous power generation is to be carried out, it is necessary to ensure that the intake flow is sufficient.

[0059] In an embodiment of the present application, a second pressure sensor 14 is provided at the inlet end of the hydrogen injector 4. The second pressure sensor 14 is connected to the control device 6 and is used to detect the fluid pressure before entering the hydrogen injector 4, so as to monitor the fluid pressure before entering the hydrogen injector 4.

[0060] In an embodiment of the present application, a third pressure sensor 15 is provided between the ejector 11 and the fuel cell anode simulation cavity 1. The third pressure sensor 15 is used to detect the fluid pressure before entering the fuel cell anode simulation cavity 1, so as to monitor the fluid pressure before entering the fuel cell anode simulation cavity 1.

[0061] In an embodiment of the present application, a second gas flowmeter 16 is provided on the reflux line 21, so as to monitor the gas flow on the reflux line 21.

[0062] Embodiment 2:

[0063] The present application discloses a control method for a detection system of a fuel cell hydrogen injector 4, including the following steps:

[0064] According to the rated input air pressure required by the fuel cell anode, calculate the rated output air pressure of each hydrogen injector 4, and calculate the standard duty cycle data according to the rated output air pressure of the hydrogen injector 4;

[0065] Number each hydrogen injector 4;

[0066] The control device 6 retrieves the standard duty cycle data at the rated output air pressure in the upper computer 5, and the control device 6 controls the hydrogen injector 4 to inject hydrogen with this standard duty cycle data as an instruction;

[0067] The first pressure sensor 7 detects the actual output air pressure at the outlet end of the hydrogen injector 4 and compares it with the rated output air pressure in the control device 6;

[0068] If the actual output air pressure of the hydrogen injector 4 is within the range of the rated output air pressure, then this hydrogen injector 4 is a standard hydrogen injector 4, so that the actual output air pressure can be kept consistent with that of the other hydrogen injectors 4 during use;

[0069] If the actual output air pressure of the hydrogen injector 4 is not within the range of the rated output air pressure, then this hydrogen injector 4 adjusts the duty cycle of the ejected hydrogen to further adjust the actual output air pressure until the actual output air pressure is within the range of the rated output air pressure, so that the actual output air pressure can be kept consistent with that of the standard hydrogen injector 4 during use;

[0070] The storage device 8 stores the duty cycle of the ejected hydrogen when the actual output air pressure of each hydrogen injector 4 is within the range of the rated output air pressure.

[0071] Among them, the specific screening method for the standard hydrogen injector 4 is as follows: The control device 6 retrieves the standard duty cycle data of the corresponding model hydrogen injector 4 from the host computer 5, and controls the hydrogen injector 4 to inject hydrogen with this standard duty cycle data as an instruction. Then, the actual output air pressure is detected at the outlet end of the hydrogen injector 4 by the first pressure sensor 7, and the detected actual output air pressure is sent to the control device 6. The control device 6 compares the rated output air pressure with the actual output air pressure. If the actual output air pressure of the hydrogen injector 4 is within the range of the rated output air pressure, it is determined that the hydrogen injector 4 belongs to the standard hydrogen injector 4, and the standard hydrogen injector 4 is screened and applied to the fuel cell, which is beneficial to maintaining the pressure balance of the anode of the fuel cell.

[0072] In the embodiment of the present application, a storage device 8 is provided in the control device 6, and the storage device 8 is used to store the actual duty cycle data of each hydrogen injector 4 when it reaches the rated output air pressure.

[0073] In the screening of the standard hydrogen injector 4, there will inevitably be some hydrogen injectors 4 whose actual output air pressure at the standard duty cycle is not within the range of the rated output air pressure. In order to ensure that this part of the hydrogen injectors 4 can continue to be used, it is necessary to calculate the actual duty cycle data of this part of the hydrogen injectors 4 when they reach the rated output air pressure, so as to realize the multi-level utilization of the hydrogen injectors 4.

[0074] Among them, the specific screening method for the non-standard hydrogen injector 4 is as follows: If the actual output air pressure of the hydrogen injector 4 is not within the range of the rated output air pressure, the control device 6 adjusts the duty cycle of the hydrogen injector 4 until the actual output air pressure is within the range of the rated output air pressure, and the storage device 8 stores the duty cycle data of the hydrogen injector 4 when the actual output air pressure is within the range of the rated output air pressure, so that the non-standard hydrogen injector 4 can also be used.

[0075] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0076] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0077] As described above, the foregoing are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily conceive of changes or substitutions, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims described.

Claims

1. A detection system for a hydrogen injector (4) of a fuel cell, characterized in that, It includes a fuel cell anode simulation cavity (1), an intake line (2) and an exhaust line. The fuel cell anode simulation cavity (1) is respectively connected to the intake line (2) and the exhaust line to form a hydrogen flow line; a hydrogen injector (4) is detachably arranged on the intake line (2), and a host computer (5) is connected to the hydrogen injector (4) through a control device (6). The control device (6) is used to control the duty ratio of the hydrogen ejected by the hydrogen injector (4). The host computer (5) is provided with standard duty ratio data under the rated output air pressure. A first pressure sensor (7) for detecting the actual output air pressure is arranged at the outlet end of the hydrogen injector (4). The first pressure sensor (7) is connected to the control device (6), and the rated output air pressure is arranged in the control device (6). A storage device (8) is arranged in the control device (6), and the storage device (8) is used to store the actual duty ratio data of each hydrogen injector (4) reaching the rated output air pressure.

2. The detection system of the fuel cell hydrogen injector (4) according to claim 1, characterized in that, The exhaust line includes a first branch (9) and a second branch (10). The first branch (9) is used to simulate the actual consumption of hydrogen in the fuel cell, and the second branch (10) is used to simulate the exhaust consumption of hydrogen in the fuel cell. The second branch (10) is connected to the intake line (2) through a return line (21) to form a circulating flow line.

3. The detection system of the fuel cell hydrogen injector (4) according to claim 2, characterized in that, An ejector (11) is arranged on one side of the hydrogen injector (4) close to the fuel cell anode simulation cavity (1), and a pressure reducing valve (3) is arranged on the side of the hydrogen injector (4) far from the fuel cell anode simulation cavity (1). A safety valve (12) and a first gas flowmeter (13) are sequentially arranged between the pressure reducing valve (3) and the hydrogen injector (4) along the flow direction. The first gas flowmeter (13) is connected to the control device (6).

4. The detection system of the fuel cell hydrogen injector (4) according to claim 3, characterized in that, A second pressure sensor (14) is arranged at the inlet end of the hydrogen injector (4). The second pressure sensor (14) is connected to the control device (6), and the second pressure sensor (14) is used to detect the fluid pressure before entering the hydrogen injector (4).

5. The detection system of the fuel cell hydrogen injector (4) according to claim 3, characterized in that A third pressure sensor (15) is arranged between the ejector (11) and the fuel cell anode simulation cavity (1). The third pressure sensor (15) is used to detect the fluid pressure before entering the fuel cell anode simulation cavity (1).

6. The detection system of the fuel cell hydrogen injector (4) according to claim 2, characterized in that, A second gas flowmeter (16) is arranged on the return line (21).

7. The detection system of the fuel cell hydrogen injector (4) according to claim 3, characterized in that, A back pressure valve (17) and an exhaust valve (18) are sequentially arranged on the second branch (10) along the gas flow direction. A fourth pressure sensor (19) is arranged between the back pressure valve (17) and the exhaust valve (18). The fourth pressure sensor (19) and the exhaust valve (18) are connected to the control device (6).

8. The detection system of the fuel cell hydrogen injector (4) according to claim 7, characterized in that, A flow control device (20) is arranged on the first branch (9). The flow control device (20) is connected to the control device (6).

9. The detection method of the detection system of the fuel cell hydrogen injector (4) according to any one of claims 2-8, characterized in that, It includes the following steps: According to the rated input air pressure required by the fuel cell anode, calculate the rated output air pressure of each hydrogen injector (4), and calculate the standard duty cycle data based on the rated output air pressure of the hydrogen injector (4); Number each hydrogen injector (4); The control device (6) retrieves the standard duty cycle data at the rated output air pressure from the upper computer (5), and the control device (6) controls the hydrogen injector (4) to inject hydrogen with this standard duty cycle data as an instruction; The first pressure sensor (7) detects the actual output air pressure at the outlet end of the hydrogen injector (4) and compares it with the rated output air pressure in the control device (6); If the actual output air pressure of the hydrogen injector (4) is within the range of the rated output air pressure, then this hydrogen injector (4) is a standard hydrogen injector (4), so that the actual output air pressure can be kept consistent with that of the other hydrogen injectors (4) during use; If the actual output air pressure of the hydrogen injector (4) is not within the range of the rated output air pressure, then this hydrogen injector (4) adjusts the duty cycle of the ejected hydrogen to further adjust the actual output air pressure until the actual output air pressure is within the range of the rated output air pressure, so that the actual output air pressure can be kept consistent with that of the standard hydrogen injector (4) during use; The storage device (8) stores the duty cycle of the ejected hydrogen when the actual output air pressure of each hydrogen injector (4) is within the range of the rated output air pressure.

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