An ejector detection method, apparatus, device and medium

Abstract

The application discloses an ejector detection method, device, equipment and medium, comprising: cooling a hydrogen flow system where an ejector to be detected, which respectively injects dry gas and non-dry gas, to a state lower than a freezing critical temperature; obtaining a first relationship and a second relationship between a current of a proportional valve of the hydrogen flow system and a flow of a nozzle of the ejector to be detected in the process that hydrogen flows in the hydrogen flow system in different states; and determining whether the ejector to be detected is additionally provided with a heating device according to the first relationship and the second relationship. The application can determine whether the ejector to be detected is additionally provided with the heating device, which improves the safety of the ejector in the actual use process, reduces the number of the heating devices used on the ejector, reduces the cost of the ejector, and simplifies the structural design of the ejector without the need of additionally providing the heating device on the ejector, thereby improving the production efficiency of the ejector.

Description

Technical Field

[0001] This invention relates to the field of fuel cell vehicle technology, and in particular to an ejector detection method, apparatus, equipment, and medium. Background Technology

[0002] Fuel cell vehicles have advantages such as being pollution-free, having high energy conversion efficiency, and having a wide range of raw material sources, thus showing great application prospects. The hydrogen recirculation equipment on a fuel cell vehicle mainly includes an ejector and a hydrogen recirculation pump. However, because the nozzle diameter of the ejector is very small, typically 1.0 to 3.0 mm, the ejector nozzle is at risk of freezing in low-temperature environments, which will affect the normal flow of hydrogen.

[0003] In related technologies, to minimize the impact of nozzle icing on hydrogen flow, heating devices are typically added to the ejector. However, since the ejector operates in a hydrogen-rich environment, adding heating devices poses safety risks; furthermore, it increases the ejector's size, making it difficult to install; and not every ejector requires additional heating, leading to unnecessary safety risks and increased size for some ejectors. Therefore, a detection technology is urgently needed to determine whether an ejector has added heating devices. Summary of the Invention

[0004] This application provides an ejector detection method, apparatus, device, and medium, which solves the technical problem in the prior art that it is impossible to determine whether a heating device has been added to the ejector, and achieves the technical effect of being able to determine whether a heating device has been added to the ejector.

[0005] Firstly, this application provides a method for detecting an ejector, the method comprising:

[0006] The hydrogen flow system containing the ejector under test, which is injected with dry gas and non-dry gas respectively, is cooled to a state below the critical freezing temperature.

[0007] During the flow of hydrogen in hydrogen flow systems under different conditions, a first relationship and a second relationship are obtained between the current of the proportional valve characterizing the hydrogen flow system and the flow rate of the nozzle of the ejector under test; the first relationship corresponds to dry gas and the second relationship corresponds to non-dry gas.

[0008] Based on the first and second relationships, determine whether the ejector to be tested needs to be equipped with a heating device.

[0009] Furthermore, the hydrogen flow system containing the ejector to be tested, which is injected with non-dry gas, is cooled to a state below the critical freezing temperature, including:

[0010] The ejector to be tested, which is injected with non-dry gas, cools the hydrogen flow system to below the critical freezing temperature with the nozzle in various tilt angles.

[0011] Furthermore, during the flow of hydrogen in a hydrogen circulation system corresponding to a non-dry gas, a second relationship is acquired, including:

[0012] Multiple second relationships are obtained when hydrogen flows through a hydrogen flow system with non-dry gas injected and nozzles at various inclination angles. Each of the multiple second relationships corresponds one-to-one with a different inclination angle.

[0013] Furthermore, the difference between the system temperature of the hydrogen flow system and the temperature of the hydrogen flowing into the corresponding state of the hydrogen flow system is less than a preset temperature threshold; the difference between the hydrogen pressures flowing into the hydrogen flow systems of different states is less than a preset pressure threshold.

[0014] Furthermore, during the flow of hydrogen in different states within a hydrogen circulation system, the method also includes:

[0015] The amount of hydrogen flowing into the hydrogen circulation system at the corresponding stage is controlled based on the hydrogen demand of the fuel cell vehicle from startup to rated power operation.

[0016] Furthermore, based on the first and second relationships, it is determined whether the ejector under test needs to be equipped with a heating device, including:

[0017] Based on the distribution pattern of the difference between the flow rates corresponding to the same current in the first and second relationships, determine whether the ejector to be tested needs to be equipped with a heating device.

[0018] Furthermore, based on the first and second relationships, it is determined whether the ejector under test needs to be equipped with a heating device, including:

[0019] When the difference between the flow rates corresponding to at least one current in the first relationship and the second relationship is greater than the difference preset threshold, it is determined that the ejector to be tested needs to be equipped with a heating device.

[0020] When the difference between the flow rate corresponding to each current in the first and second relationships is less than or equal to the preset difference threshold, it is determined that the ejector under test does not require additional heating equipment.

[0021] Secondly, this application provides an ejector detection device, the device comprising:

[0022] The refrigeration module is used to cool the hydrogen flow system containing the ejector under test, which is injected with dry gas and non-dry gas respectively, to a state below the critical freezing temperature.

[0023] The detection module is used to acquire a first relationship and a second relationship between the current of the proportional valve characterizing the hydrogen flow system and the flow rate of the nozzle of the ejector under test during the flow of hydrogen in different states of the hydrogen flow system; the first relationship corresponds to dry gas and the second relationship corresponds to non-dry gas.

[0024] The judgment module is used to determine whether the ejector under test needs to be equipped with a heating device based on the first relationship and the second relationship.

[0025] Thirdly, this application provides an electronic device, comprising:

[0026] processor;

[0027] Memory used to store processor-executable instructions;

[0028] The processor is configured to execute an ejector detection method as provided in the first aspect.

[0029] Fourthly, this application provides a non-transitory computer-readable storage medium that, when the instructions in the storage medium are executed by the processor of an electronic device, enables the electronic device to perform an ejector detection method as provided in the first aspect.

[0030] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0031] This embodiment creates a control group by injecting dry gas and non-dry gas into the ejector under test, respectively. The two control groups are first cryogenically treated, and then hydrogen gas is introduced into them. A first relationship and a second relationship are obtained, characterizing the current of the proportional valve in the hydrogen flow system and the flow rate of the ejector nozzle in each control group. Based on these first and second relationships, it is determined whether a heating device needs to be added to the ejector under test. Therefore, this embodiment can determine whether a heating device needs to be added to the ejector under test, thus avoiding the installation of heating devices on ejectors that are not necessary. This avoids the safety risks and increased ejector size associated with heating devices. On the one hand, it improves the safety of the ejector in actual use; on the other hand, it reduces the number of heating devices used on the ejector, lowering the cost. Furthermore, eliminating the need for heating devices simplifies the ejector's structural design and improves production efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A flowchart illustrating an ejector detection method provided in this application;

[0034] Figure 2 This application provides a schematic diagram of the structure of a hydrogen circulation system;

[0035] Figure 3 A schematic diagram showing the relationship between the control current of the proportional valve and the hydrogen flow rate through the proportional valve provided in this application;

[0036] Figure 4 This is a schematic diagram comparing the curves of the first relationship of the reference group and the second relationship of the experimental group in this application;

[0037] Figure 5 A flowchart illustrating another ejector detection method provided in this application;

[0038] Figure 6 A schematic diagram of the structure between the ejector under test and the rotary adjustment frame provided in this application;

[0039] Figure 7 This application provides a schematic diagram of the structure of an ejector detection device;

[0040] Figure 8 This is a schematic diagram of the structure of an electronic device provided in this application. Detailed Implementation

[0041] This application provides an ejector detection method, which solves the technical problem in the prior art that it is impossible to determine whether a heating device has been added to the ejector.

[0042] The technical solution of this application embodiment is to solve the above-mentioned technical problems, and the general idea is as follows:

[0043] A method for detecting an ejector includes: cooling a hydrogen flow system containing an ejector to be tested, which is injected with dry gas and non-dry gas respectively, to a state below the freezing critical temperature; during the flow of hydrogen in the hydrogen flow system under different states, acquiring a first relationship and a second relationship between the current of a proportional valve characterizing the hydrogen flow system and the flow rate of the nozzle of the ejector to be tested; the first relationship corresponds to dry gas, and the second relationship corresponds to non-dry gas; and determining whether a heating device should be added to the ejector to be tested based on the first relationship and the second relationship.

[0044] This embodiment creates a control group by injecting dry gas and non-dry gas into the ejector under test, respectively. The two control groups are first cryogenically treated, and then hydrogen gas is introduced into them. A first relationship and a second relationship are obtained, characterizing the current of the proportional valve in the hydrogen flow system and the flow rate of the ejector nozzle in each control group. Based on these first and second relationships, it is determined whether a heating device needs to be added to the ejector under test. Therefore, this embodiment can determine whether a heating device needs to be added to the ejector under test, thus avoiding the installation of heating devices on ejectors that are not necessary. This avoids the safety risks and increased ejector size associated with heating devices. On the one hand, it improves the safety of the ejector in actual use; on the other hand, it reduces the number of heating devices used on the ejector, lowering the cost. Furthermore, eliminating the need for heating devices simplifies the ejector's structural design and improves production efficiency.

[0045] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0046] First, it should be clarified that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0047] This embodiment provides, for example Figure 1 The method shown includes steps S11-S13.

[0048] Step S11: Cool the hydrogen flow system containing the ejector to be tested, which is injected with dry gas and non-dry gas respectively, to a state below the freezing critical temperature.

[0049] Step S12: During the process of hydrogen flowing in a hydrogen flow system under different states, obtain the first relationship and the second relationship between the current of the proportional valve characterizing the hydrogen flow system and the flow rate of the nozzle of the ejector under test; the first relationship corresponds to dry gas and the second relationship corresponds to non-dry gas.

[0050] Step S13: Determine whether the ejector to be tested needs to be equipped with a heating device based on the first relationship and the second relationship.

[0051] Regarding step S11, the hydrogen flow system containing the ejector to be tested, which is injected with dry gas and non-dry gas respectively, is cooled to a state below the critical freezing temperature.

[0052] The ejector to be tested can be any ejector that needs to be determined whether to add heating equipment.

[0053] Two treatments were applied to the ejector under test: one was to inject dry gas into the ejector, and the other was to inject non-dry gas. Injecting dry gas into the ejector was the control group, while injecting non-dry gas was the experimental group. By comparing the control group and the experimental group, it was determined whether additional heating equipment was needed for the ejector under test.

[0054] Dry gas and non-dry gas are relative terms. The greater the difference in humidity between the dry gas and the non-dry gas, the higher the accuracy of the comparison results between the reference group and the test group. Ideally, the humidity of the dry gas should be close to 0, and the humidity of the non-dry gas should be close to 100%, resulting in the highest accuracy of the comparison results between the reference group and the test group. Both the dry gas and the non-dry gas can be hydrogen, which allows for a determination of whether to add heating equipment to the ejector based on a practical application scenario that closely resembles a hydrogen flow system.

[0055] The hydrogen circulation system can be selected based on the hydrogen recirculation system compatible with the ejector under test. This embodiment only uses... Figure 2 The following explanation will use a schematic diagram of a certain hydrogen gas circulation system as an example.

[0056] [Reference Group]

[0057] First, inject dry hydrogen gas with the target pressure and temperature into the ejector under test, and then seal the ejector under test, storing the dry hydrogen gas inside the cavity of the ejector under test; then connect the hydrogen gas circulation system (i.e., the system containing the ejector under test) to the hydrogen gas circulation system. Figure 2 The structural diagram shown is placed inside a closed device with adjustable temperature (e.g., Figure 2 The environmental chamber shown in the diagram lowers the temperature of the hydrogen circulation system below the freezing critical temperature by adjusting the temperature inside the chamber. The freezing critical temperature can be determined based on the actual situation; typically, water freezes at 0°C. The target pressure and target temperature can be selected based on the actual situation; for example, the target pressure could be 1 bar and the target temperature could be 75°C.

[0058] For example, the environmental chamber can provide a temperature environment of -40℃ to 200℃. Set the temperature of the environmental chamber to -40℃, fill the cavity of the ejector under test with 1 bar of dry hydrogen at 75℃ and seal it. Then place the hydrogen circulation system in the environmental chamber for a period of time (e.g., 12 hours) until the temperature of the hydrogen circulation system reaches -40℃.

[0059] [Experimental Group]

[0060] The only difference between the test group and the reference group was whether the hydrogen gas injected into the ejector under test was a dry gas.

[0061] First, inject non-dry hydrogen gas with the target pressure, target temperature, and target humidity into the ejector under test, and then seal the ejector under test, storing the non-dry hydrogen gas inside the cavity of the ejector under test; then connect the hydrogen gas circulation system (i.e., the system containing the ejector under test) to the system. Figure 2 The structural diagram shown is placed inside a closed device with adjustable temperature (e.g., Figure 2 The environmental chamber shown in the diagram lowers the temperature of the hydrogen circulation system below the freezing critical temperature by adjusting the temperature inside the chamber. The freezing critical temperature can be determined based on actual conditions; typically, water freezes at 0°C. Target pressure, target temperature, and target humidity can be selected based on actual conditions; for example, the target pressure could be 1 bar, the target temperature could be 75°C, and the target humidity could be 95%.

[0062] For example, keep the relevant parameters of the test group consistent with those of the aforementioned reference group (excluding humidity), set the temperature of the environmental chamber to -40°C, fill the cavity of the ejector under test with 1 bar, 75°C and 95% non-dry hydrogen and seal it, and place the hydrogen circulation system in the environmental chamber for a period of time (e.g. 12 hours) until the temperature of the hydrogen circulation system is -40°C.

[0063] During the cooling process, the reference group, containing dry gas, had a low water vapor content, making condensation or icing unlikely. In contrast, the test group, containing non-dry gas with a higher water vapor content, was more prone to condensation or icing during cooling. Therefore, the test and reference groups can serve as two comparative sets to ultimately determine whether adding heating equipment to the ejector under test is necessary to address icing and blockage issues in practical applications.

[0064] It is important to note that the ejector under test in both the test and reference groups can be the same ejector. In this case, there is a specific execution order between the test and reference groups, which can be selected based on the actual situation. Alternatively, the ejectors under test in the test and reference groups can be of the same type and have similar or identical operating conditions. In this case, the test and reference groups can be executed simultaneously or sequentially, depending on the specific circumstances. Ideally, both the test and reference groups should use the same ejector under test. This avoids introducing the factor of "differences between different ejectors" and improves the accuracy of determining whether the ejector under test requires additional heating equipment.

[0065] Regarding step S12, during the process of hydrogen flowing in the hydrogen flow system under different states, a first relationship and a second relationship are obtained between the current of the proportional valve characterizing the hydrogen flow system and the flow rate of the nozzle of the ejector under test; the first relationship corresponds to dry gas and the second relationship corresponds to non-dry gas.

[0066] For both the test and reference groups, after the hydrogen flow system cooled to a preset temperature below the freezing critical temperature, the relevant valves in the hydrogen flow system were opened, and hydrogen was introduced into the system to simulate the actual application scenario of the hydrogen flow system in a fuel cell vehicle. Figure 2 As shown, a high-pressure hydrogen source provides hydrogen gas, which passes sequentially through a hydrogen flow meter, a hydrogen heat exchanger, a switching solenoid valve, and a proportional valve to reach the ejector under test. The hydrogen gas then enters the anode of the ejector under test for reaction. The exhaust gas after the reaction is output from the cathode and passes through a gas-liquid separator. After passing through the gas-liquid separator, one path returns to the ejector under test through a one-way valve, while the other path is discharged from the system through a heated drain valve and a heated hydrogen discharge valve.

[0067] The proportional valve affects the hydrogen flow rate towards the ejector (in this embodiment, the hydrogen flow rate mainly refers to the instantaneous flow rate), such as... Figure 3 The figure shows the relationship between the control current of the proportional valve and the hydrogen flow rate through the proportional valve. The larger the control current of the proportional valve, the larger the valve opening, and the larger the hydrogen flow rate towards the ejector. Figure 3 The upper curve represents the flow rate change curve of the proportional valve as the current increases. Figure 3 The lower curve represents the flow rate change curve of the proportional valve as the current decreases.

[0068] During the flow of hydrogen in different states within the hydrogen circulation system—that is, when hydrogen is introduced into the corresponding systems in the reference and test groups—the inflow of hydrogen into the corresponding hydrogen circulation system can be controlled based on the hydrogen demand of the fuel cell vehicle from startup to rated power operation. In other words, the hydrogen flow rate in the hydrogen circulation systems of the test and reference groups is determined primarily based on the hydrogen flow rate during the fuel cell vehicle's startup to rated power operation, thereby simulating the actual startup and rated power operation scenario of the fuel cell vehicle.

[0069] During the flow of hydrogen in the hydrogen circulation systems corresponding to the test group and the reference group, the correspondence between the current of the proportional valve and the hydrogen flow rate through the nozzle of the ejector under test was recorded. The relationship corresponding to the test group was recorded as the second relationship, and the relationship corresponding to the reference group was recorded as the first relationship.

[0070] The current of the proportional valve and the hydrogen flow rate of the nozzle are sampled at the same frequency, and the sampling frequency can be set according to the actual situation. In actual operation, the corresponding current and hydrogen flow rate can be collected one-to-one according to the preset sampling frequency to obtain multiple data points. Then, interpolation calculations are performed on all data points to obtain a more complete primary and secondary relationship. Figure 4 The figure shows the second relationship curve (curve B) for a certain experimental group and the first relationship curve (curve A) for a certain reference group.

[0071] It is important to note that the difference between the system temperature of the hydrogen flow system and the temperature of the hydrogen flowing into the corresponding state of the hydrogen flow system should be less than a preset temperature threshold. For example, in the test group, the difference between the temperature of the hydrogen flowing into the test group's hydrogen flow system and the system temperature of the hydrogen flow system itself should not be too large. For instance, if the system temperature of the hydrogen flow system is -40℃, then the temperature of the hydrogen flowing into the system should also be around -40℃. If the temperature of the hydrogen entering the system is too high, it may cause the ice in the nozzle to melt; if the temperature of the hydrogen entering the system is too low, it may cause more ice to accumulate in the nozzle. Ideally, the temperature of the hydrogen entering the system should be the same as the system temperature of the hydrogen flow system to reduce the impact of the hydrogen temperature entering the system on the entire detection process. This minimizes the difference between the temperature of the hydrogen flowing into the system and the system temperature, thereby reducing the impact of the hydrogen temperature on the subsequent actual flow monitoring of the ejector and improving the accuracy of determining whether the ejector under test needs additional heating equipment. Similarly, the difference between the temperature of the hydrogen flowing into the system in the reference group and the system temperature of the hydrogen flow system in the reference group should be small.

[0072] Furthermore, the pressure difference between hydrogen flowing into the hydrogen circulation system under different conditions should be less than a preset pressure threshold. In other words, the hydrogen pressures introduced into the test group and the reference group should be similar (i.e., the pressure difference between them should be less than the preset pressure threshold). Ideally, the hydrogen pressures introduced into the test group and the reference group should be the same, which can reduce the impact of pressure differences on the accuracy of the comparison results between the test group and the reference group, thereby improving the accuracy of determining whether the ejector under test requires additional heating equipment.

[0073] Regarding step S13, based on the first relationship and the second relationship, it is determined whether the ejector to be tested needs to be equipped with a heating device.

[0074] Based on the distribution pattern of the difference between the flow rates corresponding to the same current in the first and second relationships, determine whether the ejector to be tested needs to be equipped with a heating device.

[0075] In the reference group, the ejector under test was injected with dry gas, making icing during the freezing process less likely. Therefore, the corresponding first relationship characterizes the normal relationship between the proportional valve current and the nozzle hydrogen flow rate when there is no ice blockage in the nozzle. In the experimental group, the ejector under test was injected with non-dry gas, making icing during the freezing process more likely. Therefore, the corresponding second relationship characterizes the relationship between the proportional valve current and the nozzle hydrogen flow rate when icing is possible. When the difference between the first and second relationships is small, the probability of icing in the ejector under test is very low; when the difference between the first and second relationships is large, the probability of icing in the ejector under test is high.

[0076] like Figure 4 As shown, curve A is the first relationship curve corresponding to the reference group, and curve B is the second relationship curve corresponding to the test group. It can be determined that the first flow rate value in the first relationship and the second flow rate value in the second relationship are corresponding to any proportional valve current value.

[0077] When the difference between the flow rates corresponding to at least one current in the first and second relationships exceeds a preset threshold, it is determined that a heating device needs to be added to the ejector under test. Figure 4 As shown, if the difference between the first flow value of the first relationship and the second flow value of the second relationship corresponding to at least one current value is greater than the difference preset threshold, it is considered that the ejector under test is likely to freeze during actual use, and then a heating device is added.

[0078] When the difference between the flow rates corresponding to each current in the first and second relationships is less than or equal to a preset threshold, it is determined that the ejector under test does not require additional heating equipment. Figure 4 As shown, when the difference between the first flow value of the first relationship and the second flow value of the second relationship corresponding to any current value is less than or equal to the preset difference threshold, it is considered that the possibility of the ejector under test freezing during actual use is very low, so there is no need to add heating equipment.

[0079] In summary, this embodiment constructs a control group by injecting dry gas and non-dry gas into the ejector under test, respectively. The two control groups are first subjected to cryogenic treatment, and then hydrogen gas is introduced into them. A first relationship and a second relationship are obtained, characterizing the current of the proportional valve in the hydrogen flow system and the flow rate of the ejector nozzle in each control group. Based on these first and second relationships, it is determined whether a heating device needs to be added to the ejector under test. Therefore, this embodiment can determine whether a heating device needs to be added to the ejector under test, thus avoiding the installation of heating devices on ejectors that are not necessary. This avoids the safety risks and increased ejector size associated with heating devices. On the one hand, it improves the safety of the ejector in actual use; on the other hand, it reduces the number of heating devices used on the ejector, lowering the cost. Furthermore, eliminating the need for heating devices simplifies the ejector's structural design and improves production efficiency.

[0080] Based on the above solution, this embodiment also provides a better solution (see reference). Figure 5 Specifically, this includes:

[0081] Step S51: Cool the hydrogen flow system containing the ejector to be tested, which is injected with dry gas and non-dry gas respectively, to a state below the critical freezing temperature; wherein, for the ejector to be tested injected with non-dry gas, the hydrogen flow system is cooled to a state below the critical freezing temperature with the nozzle in various different tilt angles.

[0082] Step S52: During the flow of hydrogen gas in different states within the hydrogen flow system, a first relationship and a second relationship are obtained between the current of the proportional valve characterizing the hydrogen flow system and the flow rate of the nozzle of the ejector under test. The first relationship corresponds to dry gas, and the second relationship corresponds to non-dry gas. Specifically, multiple second relationships are obtained when hydrogen gas flows through the hydrogen flow system with non-dry gas injected and the nozzle at various tilt angles, with each second relationship corresponding one-to-one with a different tilt angle.

[0083] Step S53: Based on the first relationship and multiple second relationships, determine whether the ejector to be tested needs to be equipped with a heating device.

[0084] Step S51 is based on the same principle as step S11; please refer to the relevant description of step S11 for details. The difference in step S51 lies in the presence of multiple test groups. The difference between each test group is that after the ejector under test is injected with non-dry gas, the nozzle is frozen to below the critical freezing temperature at different tilt angles. For example, the nozzle tilt angle can be between -30° and +30°. By changing the nozzle tilt angle, the scenario where a fuel cell vehicle might be parked on a slope during actual parking can be simulated. Different slopes will cause different positions of the condensate in the nozzle, thus potentially affecting the degree of nozzle blockage during icing. This embodiment simulates the freezing of the nozzle at different tilt angles to more comprehensively determine whether a heating device needs to be added to the ejector under test.

[0085] For example, the ejector under test can be set in such a position as Figure 6 On the rotating adjustment bracket shown, Figure 6 The image shows the nozzle of the ejector under test at three different tilt angles. Figure 6 The left-hand diagram shows a structure with the nozzle tilted at 0° (i.e., placed horizontally). Figure 6 The middle image shows a schematic diagram of a nozzle with an inclination angle of +30°. Figure 6 The diagram on the right shows a structural schematic with a nozzle tilt angle of -30°.

[0086] The number of test groups can be determined based on the number of nozzle tilt angles selected. When the number of nozzle tilt angles is 30 (for example, each adjacent tilt angle differs by 2°), then the number of test groups is 30.

[0087] Step S52 is based on the same principle as step S12; please refer to the relevant explanation of step S12 for details. The difference in step S52 is that multiple test groups correspond to multiple second relationships, with each test group corresponding to one second relationship. In other words, each nozzle tilt angle corresponds to one second relationship.

[0088] Step S53 is based on the same principle as step S13, and you can refer to the relevant description of step S13 for details. The difference in step S53 is that multiple second relations are compared with the first relation respectively, and based on the comparison results of multiple second relations with the first relation, it is determined whether the ejector under test needs to be equipped with a heating device.

[0089] In a preferred scenario, when the differences between the first relationship and all second relationships are less than or equal to a preset difference threshold, it is determined that the ejector under test does not require additional heating equipment. In other words, regardless of the nozzle angle of the ejector under test, the difference between the corresponding second relationship and the first relationship must be less than or equal to the preset difference threshold for the ejector under test to be considered to have a very low probability of icing and clogging, thus eliminating the need for additional heating equipment. For example, the preset difference threshold could be 5%. If the absolute value of the flow difference between the parameter group and the test group is less than or equal to 5% of the ratio between the parameter group and the parameter group, then the probability of icing and clogging of the ejector under test is considered very low, and therefore, additional heating equipment is not required.

[0090] In summary, this embodiment can obtain multiple second relationships at different nozzle tilt angles. Each second relationship is compared with the first relationship to determine whether the ejector under test needs additional heating equipment. Therefore, this embodiment can comprehensively determine whether the ejector under test needs additional heating equipment, thus avoiding the installation of heating equipment on ejectors that do not require it. This avoids the safety risks and increased ejector size associated with heating equipment, improving the safety of the ejector in actual use and reducing the number of heating devices used on the ejector, thereby lowering the cost. Furthermore, eliminating the need for additional heating equipment simplifies the ejector's structural design and improves production efficiency.

[0091] Based on the same inventive concept, this application provides as follows Figure 7 The ejector detection device shown includes:

[0092] The refrigeration module 71 is used to cool the hydrogen flow system where the ejector under test is injected with dry gas and non-dry gas respectively to a state below the freezing critical temperature.

[0093] The detection module 72 is used to acquire a first relationship and a second relationship between the current of the proportional valve characterizing the hydrogen flow system and the flow rate of the nozzle of the ejector under test during the process of hydrogen flow in different states of the hydrogen flow system; the first relationship corresponds to dry gas and the second relationship corresponds to non-dry gas.

[0094] The judgment module 73 is used to determine whether the ejector under test should be equipped with a heating device based on the first relationship and the second relationship.

[0095] Furthermore, the refrigeration module 71 is used for:

[0096] The ejector to be tested, which is injected with non-dry gas, cools the hydrogen flow system to below the critical freezing temperature with the nozzle in various tilt angles.

[0097] Furthermore, the judgment module 73 is used for:

[0098] Multiple second relationships are obtained when hydrogen flows through a hydrogen flow system with non-dry gas injected and nozzles at various inclination angles. Each of the multiple second relationships corresponds one-to-one with a different inclination angle.

[0099] Furthermore, the difference between the system temperature of the hydrogen flow system and the temperature of the hydrogen flowing into the corresponding state of the hydrogen flow system is less than a preset temperature threshold; the difference between the hydrogen pressures flowing into the hydrogen flow systems of different states is less than a preset pressure threshold.

[0100] Furthermore, the device also includes a hydrogen inflow control module for:

[0101] During the flow of hydrogen in different states within the hydrogen circulation system, the amount of hydrogen flowing into the corresponding state of the hydrogen circulation system is controlled according to the hydrogen demand of the fuel cell vehicle from startup to rated power operation.

[0102] Furthermore, the judgment module 73 is specifically used for:

[0103] Based on the distribution pattern of the difference between the flow rates corresponding to the same current in the first and second relationships, determine whether the ejector to be tested needs to be equipped with a heating device.

[0104] Furthermore, the judgment module 73 is specifically used for:

[0105] When the difference between the flow rates corresponding to at least one current in the first relationship and the second relationship is greater than the difference preset threshold, it is determined that the ejector to be tested needs to be equipped with a heating device.

[0106] When the difference between the flow rate corresponding to each current in the first and second relationships is less than or equal to the preset difference threshold, it is determined that the ejector under test does not require additional heating equipment.

[0107] Based on the same inventive concept, this application provides as follows Figure 8 An electronic device shown includes:

[0108] Processor 81;

[0109] Memory 82 is used to store executable instructions of processor 81;

[0110] The processor 81 is configured to execute an ejector detection method as described above.

[0111] Based on the same inventive concept, this application provides a non-transitory computer-readable storage medium, which, when the instructions in the storage medium are executed by the processor 81 of an electronic device, enables the electronic device to perform an ejector detection method as described above.

[0112] Since the electronic device described in this embodiment is an electronic device used to implement the information processing method in the embodiments of this application, those skilled in the art can understand the specific implementation methods and various variations of the electronic device in this embodiment based on the information processing method described in the embodiments of this application. Therefore, how the electronic device implements the method in the embodiments of this application will not be described in detail here. Any electronic device used by those skilled in the art to implement the information processing method in the embodiments of this application falls within the scope of protection of this application.

[0113] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0114] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0115] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0116] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0117] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0118] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for detecting an ejector, characterized in that, The method includes: The hydrogen flow system containing the ejector under test, which is injected with dry gas and non-dry gas respectively, is cooled to a state below the critical freezing temperature. During the flow of hydrogen gas in the hydrogen gas circulation system under different conditions, a first relationship and a second relationship are obtained between the current of the proportional valve characterizing the hydrogen gas circulation system and the flow rate of the nozzle of the ejector under test; the first relationship corresponds to dry gas and the second relationship corresponds to non-dry gas. Based on the first relationship and the second relationship, determine whether the ejector to be tested needs to be equipped with a heating device.

2. The method as described in claim 1, characterized in that, Cooling the hydrogen flow system containing the ejector to be tested, which is injected with non-dry gas, to below the critical freezing temperature includes: The ejector to be tested, which is injected with non-dry gas, cools the hydrogen flow system to below the critical freezing temperature when the nozzle is at various different tilt angles.

3. The method as described in claim 2, characterized in that, During the flow of hydrogen gas within the hydrogen gas circulation system corresponding to a non-dry gas, the acquisition of the second relationship includes: The system obtains multiple second relationships corresponding to hydrogen flow when hydrogen is injected with non-dry gas and the nozzle is at multiple different inclination angles. Each of the multiple second relationships corresponds one-to-one with a multiple different inclination angle.

4. The method as described in claim 1, characterized in that, The difference between the system temperature of the hydrogen circulation system and the temperature of the hydrogen flowing into the hydrogen circulation system in the corresponding state is less than a preset temperature threshold; the difference between the hydrogen pressures flowing into the hydrogen circulation system in different states is less than a preset pressure threshold.

5. The method as described in claim 1, characterized in that, During the flow of hydrogen gas in the hydrogen circulation system under different states, the method further includes: The amount of hydrogen flowing into the hydrogen circulation system at the corresponding stage is controlled based on the hydrogen demand of the fuel cell vehicle from startup to rated power operation.

6. The method as described in claim 1, characterized in that, The step of determining whether to add a heating device to the ejector under test based on the first relationship and the second relationship includes: Based on the distribution pattern of the difference between the flow rates corresponding to the same current in the first and second relationships, it is determined whether the ejector to be tested needs to be equipped with a heating device.

7. The method as described in claim 1, characterized in that, The step of determining whether to add a heating device to the ejector under test based on the first relationship and the second relationship includes: When the difference between the flow rates corresponding to at least one current in the first relationship and the second relationship is greater than a preset threshold for the difference, it is determined that the ejector under test is equipped with a heating device. When the difference between the flow rate corresponding to each current in the first relationship and the second relationship is less than or equal to the preset difference threshold, it is determined that the ejector under test does not need to be equipped with additional heating equipment.

8. An ejector detection device, characterized in that, The device includes: The refrigeration module is used to cool the hydrogen flow system containing the ejector under test, which is injected with dry gas and non-dry gas respectively, to a state below the critical freezing temperature. The detection module is used to acquire a first relationship and a second relationship between the current of the proportional valve of the hydrogen flow system and the flow rate of the nozzle of the ejector under test during the flow of hydrogen in different states within the hydrogen flow system; the first relationship corresponds to dry gas and the second relationship corresponds to non-dry gas. The judgment module is used to determine whether the ejector under test should be equipped with a heating device based on the first relationship and the second relationship.

9. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute an ejector detection method as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium, wherein instructions in the storage medium, when executed by a processor of an electronic device, enable the electronic device to perform an ejector detection method as described in any one of claims 1 to 7.

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