Vehicle level air bypass valve leak detection method, apparatus, device, and storage medium

Abstract

The application relates to a vehicle-level air bypass valve leakage detection method, device, equipment and storage medium. The method comprises the following steps: disconnecting the air pipeline connected to the tail exhaust except the air bypass pipeline, preventing interference airflow from entering the tail exhaust; disconnecting the air outlet pipe of the electric pile and keeping the air outlet pipe of the electric pile in an open emptying state; installing a calibrated first air flowmeter at the tail exhaust; keeping the fuel cell system off, over-controlling the air bypass valve to be closed, over-controlling the first air cut-off valve to be opened to a preset opening degree, and over-controlling the air compressor to operate to a preset rotating speed; and reading a stable gas flow value on the first air flowmeter, and the gas flow value is the leakage amount of the air bypass valve. The application does not need to disassemble the valve from the vehicle for separate leakage investigation, so that the leakage investigation cost can be greatly reduced, the waste of maintenance cost is avoided, and the vehicle experience of customers is improved.

Description

Technical Field

[0001] This application relates to the field of valve detection technology for fuel cell vehicles, and more specifically, to a method, apparatus, equipment, and storage medium for detecting leakage in a vehicle-grade air bypass valve. Background Technology

[0002] As an energy-saving and environmentally friendly new energy vehicle, fuel cell vehicles are now widely used and promoted. During the operation of the fuel cell system in a fuel cell vehicle, to ensure optimal performance of the fuel cell stack, sufficient airflow is required to guarantee a complete hydrogen fuel reaction and ensure the stack's power output meets the vehicle's needs. To achieve a reliable and sufficient air supply to the stack, the air inlet must maintain a reliable seal to maintain sufficient air pressure, thereby supplying enough air into the stack. However, due to factors such as vehicle aging, leaks are prone to occur in the vehicle's air intake pipes, leading to insufficient intake pressure and air supply, affecting vehicle operation. When air pipe leaks, the sealing performance of the air bypass valve after the intercooler is usually checked. However, current technology for checking air bypass valve leaks is still limited to component-level checks, requiring the air bypass valve with leakage risk to be disassembled from the vehicle's fuel cell system for separate leak testing. This method seems simple, but it is actually very costly, especially for aftermarket vehicles, where disassembling components from the entire vehicle is very difficult. Since it was unclear whether the air bypass valve was leaking and there were no specialized leak detection tools available on site, the only repair method was to disassemble and replace the valve. This resulted in wasted repair costs and a very poor user experience for customers. Summary of the Invention

[0003] This application provides a vehicle-level air bypass valve leakage detection method, apparatus, equipment, and storage medium to solve the problem that in the prior art, the air bypass valve leakage detection method in fuel cell vehicles is singular, requiring component-level detection by disassembling and testing the valve separately, resulting in high maintenance costs and poor user experience for fuel cell vehicles.

[0004] According to the vehicle-grade air bypass valve leakage detection method provided in this application, it is applied to a fuel cell vehicle equipped with a fuel cell system. The fuel cell system includes: an air compressor, an intercooler, a humidifier, a fuel cell stack, and matching valves. The air compressor sequentially supplies air for the reaction to the fuel cell stack via the first air shut-off valve in the intercooler, humidifier, and matching valves. An air bypass pipeline leading to the exhaust is provided on the air pipeline at the outlet end of the intercooler, and an air bypass valve is provided on the air bypass pipeline. The method includes: Disconnect all air lines connected to the exhaust pipe except for the air bypass line to prevent interfering airflow from entering the exhaust pipe; Disconnect the gas outlet pipe of the fuel cell stack and keep the gas outlet pipe of the fuel cell stack in an open venting state; Install the calibrated first air flow meter at the tail end; Keep the fuel cell system off, and unauthorizedly control the air bypass valve to close, unauthorizedly control the first air shut-off valve to open to a preset opening degree, and unauthorizedly control the air compressor to run to a preset speed; Read the stable gas flow rate value on the first air flow meter. This gas flow rate value is the leakage amount of the air bypass valve.

[0005] In some embodiments, disconnecting air lines connected to the tailpipe, excluding the air bypass line, includes: Disconnect the bearing cooling purge line from the air compressor to the tailpipe, and disconnect the hydrogen purge line from the intercooler through the fuel cell stack housing to the tailpipe, while keeping the bearing cooling purge line and the hydrogen purge line in an open venting state.

[0006] In some embodiments, in a fuel cell system, the gas outlet pipe of the stack is connected to the tailpipe in sequence via a second air shut-off valve, the wet side channel of the humidifier, and an air back pressure valve. The method also includes: closing the second air shut-off valve and the air back pressure valve before the air compressor is operated by the unauthorized control.

[0007] In some embodiments, the method further includes: The first air flow meter is pre-calibrated on a fuel cell vehicle of the same model to obtain a graph or table showing the correspondence between the analog value of the first air flow meter and the actual air flow.

[0008] In some embodiments, in a fuel cell system, a second air flow meter is installed on the air pipeline at the front end of the air compressor. A first air flow meter is pre-calibrated on a fuel cell vehicle of the same model to obtain a graph or table showing the correspondence between the analog value of the first air flow meter and the actual air flow rate, including: Install the uncalibrated first air flow meter at the exhaust outlet of a fuel cell vehicle of the same model; Unauthorized control of the air bypass valve fully open, the first air shut-off valve, the second air shut-off valve, and the air back pressure valve fully closed in the same model of fuel cell vehicle; It unauthorizedly controls the operation of the air compressor and gradually increases the speed of the air compressor according to a preset step size; Read the air flow rate measured by the second air flow meter and the analog signal value of the first air flow meter; The simulated signal value of the first air flow meter is calibrated using the air flow rate measured by the second air flow meter, and the correspondence between the simulated signal value of the first air flow meter and the actual air flow rate is saved to form a graph or table.

[0009] In some embodiments, during the unauthorized control process, the preset opening degree of the first air shut-off valve is the minimum allowable opening degree, and the preset speed of the air compressor is the maximum allowable speed. The minimum allowable opening degree and the maximum allowable speed can satisfy the condition that the air compressor just does not surge, and that the pressure at the humidifier does not exceed the pressure resistance value of the membrane tube.

[0010] According to another aspect of this application, a vehicle-grade air bypass valve leakage detection device is provided, applied to a fuel cell vehicle equipped with a fuel cell system. The fuel cell system includes: an air compressor, an intercooler, a humidifier, a fuel cell stack, and matching valves. The air compressor sequentially supplies air for the reaction to the fuel cell stack via the intercooler, the humidifier, and a first air shut-off valve among the matching valves. An air bypass pipeline leading to the exhaust is provided on the air pipeline at the outlet end of the intercooler, and an air bypass valve is provided on the air bypass pipeline. The device includes: The first disconnect module is used to disconnect the air pipes connected to the tailpipe except for the air bypass pipe, to prevent interfering airflow from entering the tailpipe; The second disconnect module is used to disconnect the gas outlet pipe of the fuel cell stack and keep the gas outlet pipe of the fuel cell stack in an open venting state. The installation module is used to install the calibrated first air flow meter at the tailpipe. Unauthorized control module: Keeps the fuel cell system off, unauthorizedly controls the air bypass valve to close, unauthorizedly controls the first air shut-off valve to open to a preset opening degree, and unauthorizedly controls the air compressor to run to a preset speed; The reading module reads the stable gas flow value from the first air flow meter, which is the leakage amount of the air bypass valve.

[0011] In some embodiments, the first disconnect module is specifically used for: Disconnect the bearing cooling purge line from the air compressor to the tailpipe, and disconnect the hydrogen purge line from the intercooler through the fuel cell stack housing to the tailpipe, while keeping the bearing cooling purge line and the hydrogen purge line in an open venting state.

[0012] According to another aspect of this application, a computing device is provided, comprising: Processor; and The memory is configured to store computer-executable instructions, which, when executed, cause the processor to perform a vehicle-grade air bypass valve leakage detection method.

[0013] According to another aspect of this application, a computer-readable storage medium is provided that stores one or more programs, which, when executed by an electronic device including multiple applications, cause the electronic device to perform any of the methods described above.

[0014] The technical solution of this application, without disassembling the valves of the fuel cell vehicle, can quickly detect and troubleshoot leaks in the intercooler outlet air bypass valve by installing a first air flow meter at the exhaust outlet to control the on / off of the fuel cell system pipelines and to bypass the authority to control the opening and closing of various valves and the operation of the air compressor in the fuel cell system. Compared with existing component-level troubleshooting methods, it does not require disassembling the valve from the vehicle for separate leak troubleshooting, thus greatly reducing leak troubleshooting costs, avoiding waste of maintenance costs, and improving the customer's vehicle experience. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a fuel cell system structure using the vehicle-grade air bypass valve leakage detection method of this application is shown. Figure 2 A schematic flowchart of the vehicle-grade air bypass valve leakage detection method of this application is shown; Figure 3 A schematic diagram of the structure of the vehicle-grade air bypass valve leakage detection device of this application is shown; Figure 4 A schematic diagram of the computing device of this application is shown.

[0018] The above figures include the following reference numerals: 101. Air filter; 102. Second air flow meter; 103. Air compressor; 104. Intercooler; 105. Humidifier; 106. First air shut-off valve; 107. Fuel cell stack; 108. Second air shut-off valve; 109. Air back pressure valve; 110. Air bypass valve; 111. First air flow meter; 301. First disconnect module; 302. Second disconnect module; 303. Installation module; 304. Unauthorized access control module; 305. Reading module. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0021] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] Figure 1 A schematic diagram of a fuel cell system structure applying the vehicle-grade air bypass valve leakage detection method of this application is shown. Figure 1As shown, the air for fuel cell vehicles is typically supplied by an air compressor 103. This air passes through an intercooler 104, a humidifier 105, and connecting pipes before entering the fuel cell stack 107. Therefore, a leak in this air passage can lead to insufficient airflow into the stack, causing a single-cell low-voltage fault in the fuel cell system. This fault occurs when the voltage of an individual cell is significantly lower than the average voltage of the stack 107 due to differences in internal operating conditions between individual cells. If a single cell in the stack 107 operates under a single-cell low-voltage condition for an extended period, it will further exacerbate the low-voltage phenomenon in that cell, reducing the overall net output performance of the stack 107 and potentially requiring emergency shutdown. Furthermore, severe single-cell low-voltage conditions can also cause voltage reversal, resulting in irreversible and permanent damage to the stack 107. Therefore, a thorough leak inspection of the fuel cell system's air intake pipes is necessary to determine the extent of any leaks.

[0025] Based on the actual operating conditions of the vehicle, the sealing failure of the air bypass valve 110 behind the intercooler 104 is a major cause of the reduced airflow into the reactor. Figure 1 As shown, the air bypass valve 110 is located on the pipeline from the outlet of the intercooler 104 to the exhaust pipe. Its main functions are: 1. To bypass and dilute the hydrogen concentration in the exhaust pipe during fuel cell system startup and shutdown; 2. To open when the air compressor 103 experiences surge (surge is an unstable operating state of a centrifugal compressor in the low flow rate and high pressure ratio range) to discharge excess air and prevent the air compressor 103 from surging. Because the air bypass valve 110 is responsible for discharging air during vehicle startup and shutdown and under high pressure, it frequently opens and closes, and the pressure fluctuations under its operating conditions are large, making it a major cause of air pipeline leakage. When the seal of the air bypass valve 110 fails, air will directly enter the exhaust pipe through the air bypass valve 110, resulting in a reduction in the actual airflow entering the fuel cell stack 107, causing a malfunction in the fuel cell stack 107.

[0026] However, because the air bypass valve 110 is installed deep in the vehicle and is inconvenient to inspect, the existing technology for leak detection of the air bypass valve 110 is still at the component level. That is, the air bypass valve 110 needs to be removed from the vehicle and then inspected separately with the help of leak detection tools. As a result, the inspection and maintenance costs are high, and it is easy to cause incorrect removal, which will affect the operation of the vehicle and result in a waste of maintenance costs, revenue and time.

[0027] Based on this, this application proposes a vehicle-level air bypass valve leakage detection method. This leakage detection method can be performed at the vehicle level without removing the air bypass valve 110 from the fuel cell vehicle for separate testing, thus it is low-cost and fast and accurate.

[0028] Specifically, such as Figure 2 As shown, Figure 2A schematic flowchart of the vehicle-grade air bypass valve leakage detection method of this application is shown. (Reference) Figure 1 and Figure 2 As shown, this application discloses a vehicle-grade air bypass valve leakage detection method, applied to fuel cell vehicles equipped with fuel cell systems. Figure 1 As shown, the fuel cell system includes: an air compressor 103, an intercooler 104, a humidifier 105, a fuel cell stack 107, and matching valves. The air compressor 103 sequentially supplies air for the reaction to the fuel cell stack 107 via the intercooler 104, the humidifier 105, and a first air shut-off valve 106 among the matching valves. An air bypass pipeline leading to the exhaust is provided on the air pipeline at the outlet end of the intercooler 104, and an air bypass valve 110 is provided on the air bypass pipeline. The vehicle-grade air bypass valve leakage detection method of this application embodiment includes: Step S201: Disconnect the air lines connected to the tailpipe except for the air bypass line to prevent interfering airflow from entering the tailpipe.

[0029] The interfering airflow mentioned in this application refers to the airflow in the finished vehicle that does not flow through the air bypass valve 110. Because these air lines are directly connected to the exhaust in the finished vehicle, they allow airflow to bypass the air bypass valve 110 and directly enter the exhaust, interfering with leak testing. Therefore, this application disconnects all air lines connected to the exhaust except for the air bypass line (e.g., air lines connected to the exhaust). Figure 1 (As shown by numbers 1 and 2 in the middle), this can eliminate interfering airflow from entering the exhaust, thereby avoiding interference with the test results.

[0030] Step S202: Disconnect the vent pipe of the fuel cell stack 107 and keep the vent pipe of the fuel cell stack 107 in an open venting state.

[0031] The open venting state mentioned in this application refers to a state where the gas passage is open and directly connected to the outside, without being connected to other gas supply structures, thereby directly venting the air flowing out of the interior. This is achieved by disconnecting the gas outlet pipe of the fuel cell stack 107 (i.e., Figure 1 As shown in the figure 3), on the one hand, it can prevent the air discharged from the fuel cell stack 107 from entering the tail section, and on the other hand, it can ensure the unobstructed air intake passage, thereby avoiding blockage of the air intake passage and preventing the air compressor 103 from surging and damaging the air compressor 103.

[0032] Step S203: Install the calibrated first air flow meter 111 at the tail end.

[0033] Through the aforementioned steps S201 and S202, it can be seen that in this embodiment, all air intake pipes except for the air bypass pipe at the tailpipe have been disconnected. That is, apart from the air bypass pipe, there are no other channels for air to directly enter the tailpipe or enter the tailpipe via the fuel cell stack 107. Therefore, the air flow rate at the tailpipe is the air flow rate through the air bypass valve 110.

[0034] Step S204: Keep the fuel cell system off, close the air bypass valve 110 with unauthorized control, open the first air shut-off valve 106 to the preset opening degree with unauthorized control, and run the air compressor 103 to the preset speed with unauthorized control.

[0035] By controlling the operation of the air compressor 103 to allow air to enter the air pipeline, a certain pressure can be formed before the first air shut-off valve 106. Under this pressure, if there is a leak in the air bypass valve 110, the leaking airflow will flow into the tailpipe.

[0036] Step S205: Read the stable gas flow value on the first air flow meter 111. Since the air bypass valve 110 is closed at this time, the gas flow value is the leakage amount of the air bypass valve 110.

[0037] Through the above design, the vehicle-level air bypass valve leakage detection method of this application can quickly detect and troubleshoot leakage of the air bypass valve 110 at the outlet of the intercooler 104 without disassembling the valve of the fuel cell vehicle. This is achieved by installing a first air flow meter 111 at the exhaust, controlling the on / off of the fuel cell system pipeline on the fuel cell vehicle, and overriding the control of the opening and closing of each valve of the fuel cell system and the operation of the air compressor 103. Compared with existing component-level troubleshooting methods, it is not necessary to disassemble the valve from the vehicle for separate leakage troubleshooting, thus greatly reducing leakage troubleshooting costs, avoiding waste of maintenance costs, and improving the customer's vehicle experience.

[0038] In some embodiments of this application, reference is made to Figure 1 As shown, in step S201, disconnecting the air lines connected to the tailpipe except for the air bypass line includes: disconnecting the bearing cooling purge line from the air compressor 103 to the tailpipe (i.e., Figure 1 (as indicated by number 1 in the middle), and disconnect the hydrogen purging line from the intercooler 104 through the housing of the fuel cell stack 107 to the tailpipe (i.e. Figure 1 (as indicated by the number 2 in the middle), and keep the bearing cooling purging pipeline and hydrogen purging pipeline in an open and vented state.

[0039] Because the air compressor 103 in the fuel cell system can reach speeds of tens of thousands of revolutions per minute, its temperature is very high. Therefore, a portion of the air entering the air compressor 103 needs to be used to cool its bearings. The cooled air will then be discharged through hoses or other means into the exhaust system. Figure 1 (Referring to the number 1 in the middle). Therefore, by disconnecting the bearing cooling purge pipeline, the flow statistics of the tail section can be avoided by the air in this pipeline.

[0040] Furthermore, for safety reasons, in this embodiment, a portion of the intake air from the air compressor 103 is led out to the housing of the fuel cell stack 107 after passing through the intercooler 104, in order to purge any hydrogen that may leak from the housing and allow it to be discharged into the tailpipe (i.e. Figure 1 (as indicated by the number 2 in the middle), thereby avoiding dangers such as hydrogen explosions. Therefore, by disconnecting the hydrogen purging pipeline, the flow statistics of the tail gas can be avoided by the air in this pipeline.

[0041] In actual vehicle design, the bearing cooling purging line and the hydrogen purging line are usually connected to the exhaust in the form of hoses. Therefore, in this embodiment, only a few hoses (such as rubber hoses) need to be disassembled to quickly check whether there is a leak in the air bypass valve 110, which can greatly reduce the inspection cost.

[0042] In some embodiments of this application, such as Figure 1 As shown, in the fuel cell system, the outlet pipe of the stack 107 is connected to the tailpipe sequentially via the second air shut-off valve 108, the wet side channel of the humidifier 105, and the air back pressure valve 109. Furthermore, the method of this application further includes: before the unauthorized control of the air compressor 103 to operate, the unauthorized control of the second air shut-off valve 108 and the air back pressure valve 109 to close. This ensures that no external airflow enters the tailpipe from this point, and also prevents airflow within the tailpipe from escaping through this path during leak detection, thus ensuring the accuracy of the gas flow rate detected by the first air flow meter and consequently guaranteeing the accuracy of the quantitative leak detection by the air bypass valve 110.

[0043] In some embodiments of this application, the vehicle-grade air bypass valve leakage detection method of this embodiment further includes: step S206, calibrating the first air flow meter 111 in advance on a fuel cell vehicle of the same model to obtain a graph or table showing the correspondence between the analog quantity of the first air flow meter 111 and the actual air flow.

[0044] Because the accuracy, repeatability, linearity, stability, and reliability of air flow meters are affected by the structure of the pipeline, it is necessary to calibrate the air flow meters in advance for the same fuel cell system air intake pipeline. In this embodiment, the first air flow meter 111 is calibrated on the same model of fuel cell vehicle. The correspondence between the analog quantity of the first air flow meter 111 and the actual air flow is obtained in a graph or table and written into the test software to accurately read the leakage of the air bypass valve 110.

[0045] In some embodiments of this application, such as Figure 1As shown, in the fuel cell system, the outlet pipe of the stack 107 is connected to the exhaust pipe via a second air shut-off valve 108, the wet side channel of the humidifier 105, and an air back pressure valve 109. A second air flow meter 102 is installed on the air intake pipe at the front end of the air compressor 103. Based on this, in step S206, the first air flow meter 111 is pre-calibrated on a fuel cell vehicle of the same model to obtain a graph or table showing the correspondence between the analog value of the first air flow meter 111 and the actual air flow, including: The uncalibrated first air flow meter 111 was installed at the exhaust outlet of a fuel cell vehicle of the same model. This placed the first air flow meter 111 in the same piping structure as during the leak investigation.

[0046] The system unauthorizedly controls the air bypass valve 110 of the same model of fuel cell vehicle to be fully open, and the first air shut-off valve 106, the second air shut-off valve 108, and the air back pressure valve 109 to be fully closed.

[0047] The system oversteps its authority to control the operation of the air compressor 103 and gradually increases the speed of the air compressor 103 according to a preset step size.

[0048] Read the air flow rate measured by the second air flow meter 102 and the analog signal value of the first air flow meter 111.

[0049] The simulated signal value of the first air flow meter 111 is calibrated using the air flow rate measured by the second air flow meter 102, and the correspondence between the simulated signal value of the first air flow meter 111 and the actual air flow rate is saved to form a graph or table.

[0050] It should be noted that the reference is... Figure 1 As shown, during the above calibration process on the fuel cell vehicle, the bearing cooling purge line (i.e. Figure 1 As shown in number 1), hydrogen purging line (i.e. Figure 1 (as shown by number 2) and the exhaust pipe of fuel cell stack 107 (i.e. Figure 1 (As shown by number 3) remains connected. Therefore, all the air flowing through the second air flow meter 102 will eventually flow into the tailpipe, that is, the actual air flow of the second air flow meter 102 and the first air flow meter 111 are consistent. Therefore, in this embodiment, the reading of the original second air flow meter 102 on the vehicle is used to calibrate the first air flow meter 111.

[0051] For example, during calibration, the unauthorized control fully opens the air bypass valve 110, and fully closes the first air shut-off valve 106, the second air shut-off valve 108, and the air back pressure valve 109. With a preset step size of 5000 rpm, the unauthorized control runs the air compressor 103 from 30000 to 100000 rpm, and the following data is recorded: Table 1 Calibration Table for the First Air Flow Meter

[0052] By creating a calibration table or fitting a calibration curve using the simulated and flow values ​​of the first air flow meter shown in columns three and four of the table above, and then writing this data into the testing software, leak detection can be performed. During leak detection, the actual airflow rate can be obtained by reading the simulated signal voltage value of the first air flow meter 111 and referring to the table or graph. This actual gas flow rate is the leakage value of the air bypass valve 110. Thus, this application achieves quantitative leakage measurement of the air bypass valve 110.

[0053] like Figure 1 As shown in this embodiment, an air filter 101 is provided at the air compressor inlet of the fuel cell system to filter the air, ensuring clean incoming air and protecting equipment such as the fuel cell stack 107. Furthermore, in this embodiment, unauthorized control of the fuel cell system can be achieved by connecting a host computer to the fuel cell controller (FCU) of the fuel cell system. Since the FCU itself has an external interface, this unauthorized control operation is convenient and will not damage the vehicle.

[0054] In some embodiments of this application, in the overreach control of step S204, the preset opening degree of the first air shut-off valve 106 is the minimum allowable opening degree, and the preset speed of the air compressor 103 is the maximum allowable speed. The minimum allowable opening degree and the maximum allowable speed are such that the air compressor 103 just does not surge, and the pressure at the humidifier 105 does not exceed the pressure resistance value of the membrane tube.

[0055] In the leak detection method of this application, the preset opening degree of the first air shut-off valve 106 is not zero, but the minimum allowable opening degree. The purpose is to create sufficient pressure at the front end of the air bypass valve 110 for leak detection without causing surge damage to the air compressor 103. The preset opening degree of the first air shut-off valve 106 needs to be calibrated in advance on the fuel cell system to ensure that the pressure at the front end of the air bypass valve 110 is both high enough and does not exceed the pressure that the membrane tube of the humidifier 105 can withstand.

[0056] Similarly, the preset speed of the air compressor 103 is the maximum permissible speed. This maximum permissible speed is also intended to maximize the pressure value at the front end of the air bypass valve 110, thereby improving the accuracy of leak detection of the air bypass valve 110. This maximum permissible speed of the air compressor also needs to be calibrated in advance on the fuel cell system to match the minimum permissible opening of the first air shut-off valve 106, so that the pressure at the front end of the air bypass valve 110 meets the test requirements.

[0057] This application also discloses a vehicle-grade air bypass valve leakage detection device, which is configured in accordance with the above-mentioned vehicle-grade air bypass valve leakage detection method, and its working principle can be referred to the above description.

[0058] like Figure 3 As shown, this application discloses a vehicle-grade air bypass valve leakage detection device, applied to a fuel cell vehicle equipped with a fuel cell system. The fuel cell system includes: an air compressor 103, an intercooler 104, a humidifier 105, a fuel cell stack 107, and matching valves. The air compressor 103 sequentially supplies air for the reaction to the fuel cell stack 107 via the intercooler 104, the humidifier 105, and a first air shut-off valve 106 among the matching valves. An air bypass pipeline leading to the exhaust is provided on the air pipeline at the outlet end of the intercooler 104, and an air bypass valve 110 is provided on the air bypass pipeline. The vehicle-grade air bypass valve leakage detection device includes: The first disconnect module 301 is used to disconnect the air pipes connected to the tailpipe except for the air bypass pipe, so as to prevent interfering airflow from entering the tailpipe.

[0059] The second disconnect module 302 is used to disconnect the vent pipe of the fuel cell stack 107 and keep the vent pipe of the fuel cell stack 107 in an open venting state.

[0060] Mounting module 303 is used to install the calibrated first air flow meter 111 at the tail end.

[0061] The unauthorized control module 304 is used to keep the fuel cell system off, unauthorizedly control the air bypass valve 110 to close, unauthorizedly control the first air shut-off valve 106 to open to a preset opening degree, and unauthorizedly control the air compressor 103 to run to a preset speed.

[0062] The reading module 305 is used to read the stable gas flow value on the first air flow meter 111, which is the leakage amount of the air bypass valve 110.

[0063] In some embodiments of this application, the first disconnect module 301 is specifically used to: disconnect the bearing cooling purge pipeline from the air compressor 103 to the tailpipe, and disconnect the hydrogen purge pipeline from the intercooler 104 through the housing of the fuel cell stack 107 to the tailpipe, while keeping the bearing cooling purge pipeline and the hydrogen purge pipeline in an open venting state.

[0064] In some embodiments of this application, in the fuel cell system, the outlet pipe of the fuel cell stack 107 is connected to the tailpipe in sequence via the second air shut-off valve 108, the wet side channel of the humidifier 105, and the air back pressure valve 109. The overreach control module 304 is also used to: overreach control the second air shut-off valve 108 and the air back pressure valve 109 to close before the air compressor 103 is operated.

[0065] In some embodiments of this application, the vehicle-grade air bypass valve leakage detection device further includes: a calibration module, used to pre-calibrate the first air flow meter 111 on a fuel cell vehicle of the same model to obtain a graph or table showing the correspondence between the analog quantity of the first air flow meter 111 and the actual air flow.

[0066] In some embodiments of this application, in the fuel cell system, a second air flow meter 102 is provided on the air pipeline at the front end of the air compressor 103. The calibration module is specifically used for: installing an uncalibrated first air flow meter 111 to the exhaust port of a fuel cell vehicle of the same model; unilaterally controlling the air bypass valve 110 of the fuel cell vehicle of the same model to be fully open, and the first air shut-off valve 106, the second air shut-off valve 108, and the air back pressure valve 109 to be fully closed; unilaterally controlling the operation of the air compressor 103, and gradually increasing the speed of the air compressor 103 according to a preset step size; reading the air flow measured by the second air flow meter 102 and the analog signal value of the first air flow meter 111; calibrating the analog signal value of the first air flow meter 111 using the air flow measured by the second air flow meter 102, and saving it to form a correspondence diagram or table between the analog signal value of the first air flow meter 111 and the actual air flow.

[0067] In some embodiments of this application, the overreach control module 304 is specifically used to: control the preset opening degree of the first air shut-off valve 106 to the minimum allowable opening degree, and control the preset speed of the air compressor 103 to the maximum allowable speed. The minimum allowable opening degree and the maximum allowable speed can satisfy the condition that the air compressor 103 just does not surge, and satisfy the condition that the pressure at the humidifier 105 does not exceed the pressure resistance value of the membrane tube.

[0068] In summary, the vehicle-grade air bypass valve leakage detection device of this application, without disassembling the valve of the fuel cell vehicle, can quickly detect and troubleshoot leaks in the intercooler outlet air bypass valve by installing a first air flow meter at the exhaust, controlling the on / off of the fuel cell system pipelines on the fuel cell vehicle, and overriding the authority to control the opening and closing of various valves and the operation of the air compressor in the fuel cell system. Compared with existing component-level troubleshooting methods, it does not require disassembling the valve from the vehicle for separate leak troubleshooting, thus greatly reducing leak troubleshooting costs, avoiding waste of maintenance costs, and improving the customer's vehicle experience.

[0069] This application also discloses a computing device. (Reference) Figure 4As shown, at the hardware level, the computing device includes a processor, and optionally also includes an internal bus, a network interface, and memory. The memory may include main memory, such as high-speed random-access memory (RAM), or it may include non-volatile memory, such as at least one disk drive. Of course, the computing device may also include other hardware required for other business operations.

[0070] The processor, network interface, and memory can be interconnected via an internal bus, which can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. This bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 4 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0071] Memory is used to store programs. Specifically, programs may include program code, which includes computer operation instructions. Memory may include main memory and non-volatile memory, and provides instructions and data to the processor.

[0072] The processor reads the corresponding computer program from non-volatile memory into main memory and then runs it, forming a container application deployment device at the logical level. The processor executes the program stored in memory and specifically performs the following: Disconnect all air lines connected to the tailpipe except for the air bypass line to prevent interfering airflow from entering the tailpipe; disconnect the fuel cell stack's outlet pipe and keep the stack's outlet pipe in an open venting state; install the calibrated first air flow meter at the tailpipe; keep the fuel cell system powered off, and use an overriding control to close the air bypass valve, open the first air shut-off valve to a preset opening degree, and overriding control to run the air compressor to a preset speed; read the stable gas flow value on the first air flow meter, which is the leakage amount of the air bypass valve.

[0073] The vehicle-grade air bypass valve leakage detection method executed by the aforementioned vehicle-grade air bypass valve leakage detection device can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The aforementioned processor can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software module can reside in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0074] This application also proposes a computer-readable storage medium that stores one or more programs, the programs including instructions that, when executed by a computing device comprising multiple applications, enable the computing device to perform... Figure 1 The container application deployment method shown in the embodiment is specifically used for execution: Disconnect all air lines connected to the tailpipe except for the air bypass line to prevent interfering airflow from entering the tailpipe; disconnect the fuel cell stack's outlet pipe and keep the stack's outlet pipe in an open venting state; install the calibrated first air flow meter at the tailpipe; keep the fuel cell system powered off, and use an overriding control to close the air bypass valve, open the first air shut-off valve to a preset opening degree, and overriding control to run the air compressor to a preset speed; read the stable gas flow value on the first air flow meter, which is the leakage amount of the air bypass valve.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus 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.

[0079] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0080] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0081] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0082] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0083] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application 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.

[0084] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for detecting leakage in a vehicle-grade air bypass valve, applied to a fuel cell vehicle equipped with a fuel cell system, the fuel cell system comprising: An air compressor (103), an intercooler (104), a humidifier (105), a fuel cell stack (107), and matching valves are provided. The air compressor (103) sequentially supplies air for the reaction to the fuel cell stack (107) via the intercooler (104), the humidifier (105), and a first air shut-off valve (106) among the matching valves. An air bypass pipeline leading to the tailpipe is provided on the air pipeline at the outlet end of the intercooler (104), and an air bypass valve (110) is provided on the air bypass pipeline. The method is characterized by comprising: Disconnect all air lines connected to the tailpipe except for the air bypass line to prevent interfering airflow from entering the tailpipe; Disconnect the vent pipe of the fuel cell stack (107) and keep the vent pipe of the fuel cell stack (107) in an open venting state; A calibrated first air flow meter (111) is installed at the tail end; Keep the fuel cell system off, and control the air bypass valve (110) to close, control the first air shut-off valve (106) to open to a preset opening degree, and control the air compressor (103) to run to a preset speed. Read the stable gas flow value on the first air flow meter (111), which is the leakage amount of the air bypass valve (110).

2. The method for detecting leakage in a vehicle-grade air bypass valve according to claim 1, characterized in that, Disconnecting the air lines connected to the tailpipe, except for the air bypass line, includes: Disconnect the bearing cooling purge line from the air compressor (103) to the tail section, and disconnect the hydrogen purge line from the intercooler (104) through the housing of the fuel cell stack (107) to the tail section, while keeping the bearing cooling purge line and the hydrogen purge line in an open venting state.

3. The method for detecting leakage in a vehicle-grade air bypass valve according to claim 1 or 2, characterized in that, In the fuel cell system, the air outlet pipe of the stack (107) is connected to the tailpipe in sequence via the second air shut-off valve (108) in the matching valve, the wet side channel of the humidifier (105) and the air back pressure valve (109) in the matching valve; The method further includes: before unauthorized control of the operation of the air compressor (103), unauthorized control of the second air shut-off valve (108) and the air back pressure valve (109) to close.

4. The method for detecting leakage in a vehicle-grade air bypass valve according to claim 1, characterized in that, The method further includes: The first air flow meter (111) is pre-calibrated on a fuel cell vehicle of the same model to obtain a graph or table showing the correspondence between the analog quantity of the first air flow meter (111) and the actual air flow.

5. The method for detecting leakage in a vehicle-grade air bypass valve according to claim 4, characterized in that, In the fuel cell system, the outlet pipe of the stack (107) is connected to the tailpipe via the second air shut-off valve (108) in the matching valve, the wet side channel of the humidifier (105), and the air back pressure valve (109) in the matching valve; a second air flow meter (102) is installed on the air pipeline at the front end of the air compressor (103). The first air flow meter (111) is pre-calibrated on the same type of fuel cell vehicle to obtain a graph or table showing the correspondence between the analog value of the first air flow meter (111) and the actual air flow, including: The first air flow meter (111), which has not yet been calibrated, is installed at the exhaust of the fuel cell vehicle of the same model; The system unauthorizedly controls the air bypass valve (110) of the same model of fuel cell vehicle to be fully open, and the first air shut-off valve (106), the second air shut-off valve (108) and the air back pressure valve (109) to be fully closed. The system oversteps its authority to control the operation of the air compressor (103) and gradually increases the speed of the air compressor (103) according to a preset step size; Read the air flow rate measured by the second air flow meter (102) and the analog signal value of the first air flow meter (111); The analog signal value of the first air flow meter (111) is calibrated using the air flow measured by the second air flow meter (102), and a graph or table showing the correspondence between the analog signal value of the first air flow meter (111) and the actual air flow is saved.

6. The method for detecting leakage in a vehicle-grade air bypass valve according to claim 1, characterized in that, During the unauthorized control process, the preset opening degree of the first air shut-off valve (106) is the minimum allowable opening degree, and the preset speed of the air compressor (103) is the maximum allowable speed. The minimum allowable opening degree and the maximum allowable speed can satisfy the condition that the air compressor (103) just does not surge, and satisfy the condition that the pressure at the humidifier (105) does not exceed the pressure resistance value of the membrane tube.

7. A vehicle-grade air bypass valve leakage detection device, applied to a fuel cell vehicle equipped with a fuel cell system, the fuel cell system comprising: The device comprises an air compressor (103), an intercooler (104), a humidifier (105), a fuel cell stack (107), and matching valves. The air compressor (103) sequentially supplies air for the reaction to the fuel cell stack (107) via the intercooler (104), the humidifier (105), and a first air shut-off valve (106) among the matching valves. An air bypass pipeline leading to the tailpipe is provided on the air pipeline at the outlet end of the intercooler (104), and an air bypass valve (110) is provided on the air bypass pipeline. The device is characterized by comprising: The first disconnect module (301) is used to disconnect the air pipes connected to the tailpipe except for the air bypass pipe, so as to prevent interfering airflow from entering the tailpipe; The second disconnect module (302) is used to disconnect the gas outlet pipe of the fuel cell stack (107) and keep the gas outlet pipe of the fuel cell stack (107) in an open venting state. Mounting module (303) for mounting a calibrated first air flow meter (111) at the tailpipe; The overreach control module (304) is used to keep the fuel cell system off, overreach control the air bypass valve (110) to close, overreach control the first air shut-off valve (106) to open to a preset opening degree, and overreach control the air compressor (103) to run to a preset speed. The reading module (305) is used to read the stable gas flow value on the first air flow meter (111), which is the leakage amount of the air bypass valve (110).

8. The vehicle-grade air bypass valve leakage detection device according to claim 7, characterized in that, The first disconnect module (301) is specifically used for: Disconnect the bearing cooling purge line from the air compressor (103) to the tail section, and disconnect the hydrogen purge line from the intercooler (104) through the housing of the fuel cell stack (107) to the tail section, while keeping the bearing cooling purge line and the hydrogen purge line in an open venting state.

9. A computing device, characterized in that, include: processor; as well as A memory configured to store computer-executable instructions, which, when executed, cause the processor to perform the method as described in any one of claims 1 to 6.

10. A computer-readable storage medium storing one or more programs, characterized in that, When the one or more programs are executed by an electronic device including multiple applications, the electronic device performs the method according to any one of claims 1 to 6.

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