Hydrogen fuel cell hydrogen leak detection method, device and computer equipment

Abstract

The present application relates to a hydrogen leakage detection method, device, computer equipment, storage medium and computer program product for a hydrogen fuel cell. The method comprises: determining whether the inlet pressure of the hydrogen injector meets the leakage detection requirements based on the first pressure acquisition result, and determining whether the hydrogen pressure entering the stack meets the leakage detection requirements based on the second pressure acquisition result; when both the inlet pressure and the hydrogen pressure entering the stack meet the requirements, controlling the hydrogen pressure reducing valve and the tail exhaust solenoid valve to close, and when both the hydrogen pressure reducing valve and the tail exhaust solenoid valve are closed, starting the timer, and obtaining the third pressure acquisition result of the second pressure sensor at the same time, and when the timing value of the timer reaches the preset timing value, obtaining the fourth pressure acquisition result of the second pressure sensor; determining whether the hydrogen of the hydrogen fuel cell is leaking based on the third pressure acquisition result, the fourth pressure acquisition result and the preset timing value.

Description

Technical Field

[0001] The present application relates to the field of hydrogen fuel cell technology, and in particular to a hydrogen leakage detection method, device, computer equipment, storage medium and computer program product for a hydrogen fuel cell. Background Art

[0002] The working principle of a hydrogen fuel cell is to send hydrogen to the negative electrode of the hydrogen fuel cell. After the action of the catalyst, an electron in the hydrogen atom is separated, and the hydrogen ion that has lost the electron passes through the proton exchange membrane to reach the positive electrode of the hydrogen fuel cell. Since the electron cannot pass through the proton exchange membrane, it can only reach the positive electrode of the hydrogen fuel cell through the external circuit, thereby generating current in the external circuit.

[0003] However, the existing hydrogen fuel cell technology is not mature enough. After long-term use, the internal circuits and the outer shell of the hydrogen fuel cell are prone to aging, resulting in hydrogen leakage. Since hydrogen is flammable, it is a safety hazard for new energy vehicles. Therefore, a hydrogen leakage detection method for hydrogen fuel cells is urgently needed. Summary of the invention

[0004] Based on this, it is necessary to provide a hydrogen leakage detection method, device, computer equipment, computer readable storage medium and computer program product for a hydrogen fuel cell that can detect hydrogen leakage of a hydrogen fuel cell in response to the above technical problems.

[0005] In the first aspect, the present application provides a method for detecting hydrogen leakage of a hydrogen fuel cell. The method is applied to a fuel cell system, the system comprising a hydrogen pressure reducing valve, a first pressure sensor, a second pressure sensor, a hydrogen ejector, a hydrogen injector, an air compressor, a tail exhaust solenoid valve, a first air shut-off valve, a second air shut-off valve and an air bypass valve; the first pressure sensor is installed after the hydrogen pressure reducing valve, and the second pressure sensor is installed on the hydrogen pipeline between the hydrogen ejector and the hydrogen fuel cell stack; the method comprises:

[0006] When entering the hydrogen leakage detection state, the first air shut-off valve is controlled to be closed, the second air shut-off valve is controlled to be closed, and the air bypass valve is controlled to be opened; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, the air compressor is controlled to start, the speed of the air compressor is set to a preset speed, and whether the speed of the air compressor is within a first preset range is monitored in real time;

[0007] When the speed of the air compressor is within a first preset range, the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve are controlled to open;

[0008] Obtaining a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determining whether an inlet pressure of the hydrogen injector meets the leakage detection requirement based on the first pressure acquisition result, and determining whether an inlet hydrogen pressure of the stack meets the leakage detection requirement based on the second pressure acquisition result;

[0009] When the inlet pressure and the hydrogen pressure entering the stack meet the requirements, the hydrogen pressure reducing valve and the tail exhaust solenoid valve are controlled to be closed. When the hydrogen pressure reducing valve and the tail exhaust solenoid valve are both closed, the timer is started, and the third pressure acquisition result of the second pressure sensor is obtained at the same time. When the timing value of the timer reaches the preset timing value, the fourth pressure acquisition result of the second pressure sensor is obtained;

[0010] Based on the third pressure collection result, the fourth pressure collection result and the preset timing value, it is determined whether hydrogen leakage occurs in the hydrogen fuel cell.

[0011] In one embodiment, determining whether the inlet pressure of the hydrogen injector meets the leakage detection requirement based on the first pressure acquisition result, and determining whether the inlet hydrogen pressure meets the leakage detection requirement based on the second pressure acquisition result includes:

[0012] Obtaining an absolute value of a first difference between the first pressure acquisition result and the first threshold value, and determining that the inlet pressure meets the leakage detection requirement when the absolute value of the first difference is within a second preset range, and determining that the inlet pressure does not meet the leakage detection requirement when the absolute value of the first difference is not within the second preset range;

[0013] The absolute value of the second difference between the second pressure collection result and the second threshold value is obtained. When the absolute value of the second difference is within a third preset range, it is determined that the hydrogen pressure entering the stack meets the leakage detection requirement. When the absolute value of the second difference is not within the third preset range, it is determined that the hydrogen pressure entering the stack does not meet the leakage detection requirement.

[0014] In one embodiment, determining whether hydrogen gas of a hydrogen fuel cell leaks based on the third pressure collection result, the fourth pressure collection result and a preset timing value includes:

[0015] Obtaining a third difference between the third pressure collection result and the fourth pressure collection result, and obtaining a ratio between the third difference and a preset timing value;

[0016] When the ratio is greater than the third threshold, it is determined that hydrogen leakage occurs in the hydrogen fuel cell; otherwise, it is determined that hydrogen leakage does not occur in the hydrogen fuel cell.

[0017] In one embodiment, after determining whether hydrogen gas in the hydrogen fuel cell leaks based on the third pressure collection result, the fourth pressure collection result and the preset timing value, the method includes:

[0018] The tail exhaust solenoid valve is controlled to open, and the fifth pressure collection result of the second pressure sensor is detected in real time. When the fifth pressure collection result is reduced to the fourth threshold, the air compressor and the hydrogen injector are controlled to be closed.

[0019] In one embodiment, the system further comprises a gas-water separator; and the method further comprises:

[0020] When the fuel cell system operates normally, the hydrogen pressure reducing valve, the hydrogen injector, the air compressor, the first air shut-off valve and the second air shut-off valve are controlled to open, the air bypass valve is controlled to close, and the tail exhaust solenoid valve is periodically controlled to open and close.

[0021] In one embodiment, after real-time monitoring of whether the rotation speed of the air compressor is within a first preset range, the method includes:

[0022] When the rotation speed of the air compressor is not within the first preset range, the hydrogen fuel cell enters a hydrogen leakage detection interruption state.

[0023] In a second aspect, the present application also provides a hydrogen leakage detection device for a hydrogen fuel cell. The device comprises:

[0024] A hydrogen pressure reducing valve, a first pressure sensor, a second pressure sensor, a hydrogen ejector, a hydrogen injector, an air compressor, a tail exhaust solenoid valve, a first air shut-off valve, a second air shut-off valve and an air bypass valve; the first pressure sensor is installed after the hydrogen pressure reducing valve, and the second pressure sensor is installed on the hydrogen pipeline between the hydrogen ejector and the hydrogen fuel cell stack;

[0025] A first control module is used to control the first air shut-off valve to close, the second air shut-off valve to close, and the air bypass valve to open when entering a hydrogen leak detection state; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, control the air compressor to start, set the speed of the air compressor to a preset speed, and monitor in real time whether the speed of the air compressor is within a first preset range;

[0026] A second control module is used to control the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve to open when the speed of the air compressor is within a first preset range;

[0027] a first determination module, configured to obtain a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determine whether an inlet pressure of the hydrogen injector meets the leakage detection requirement based on the first pressure acquisition result, and determine whether an inlet hydrogen pressure of the stack meets the leakage detection requirement based on the second pressure acquisition result;

[0028] A third control module is used to control the hydrogen pressure reducing valve and the tail exhaust solenoid valve to close when both the inlet pressure and the hydrogen pressure entering the stack meet the requirements, and when both the hydrogen pressure reducing valve and the tail exhaust solenoid valve are closed, start the timer and simultaneously obtain the third pressure acquisition result of the second pressure sensor, and when the timing value of the timer reaches a preset timing value, obtain the fourth pressure acquisition result of the second pressure sensor;

[0029] The second determination module is used to determine whether hydrogen leakage occurs in the hydrogen fuel cell based on the third pressure collection result, the fourth pressure collection result and the preset timing value.

[0030] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0031] When entering the hydrogen leakage detection state, the first air shut-off valve is controlled to be closed, the second air shut-off valve is controlled to be closed, and the air bypass valve is controlled to be opened; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, the air compressor is controlled to start, the speed of the air compressor is set to a preset speed, and whether the speed of the air compressor is within a first preset range is monitored in real time;

[0032] When the speed of the air compressor is within a first preset range, the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve are controlled to open;

[0033] Obtaining a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determining whether an inlet pressure of the hydrogen injector meets the leakage detection requirement based on the first pressure acquisition result, and determining whether an inlet hydrogen pressure of the stack meets the leakage detection requirement based on the second pressure acquisition result;

[0034] When the inlet pressure and the hydrogen pressure entering the stack meet the requirements, the hydrogen pressure reducing valve and the tail exhaust solenoid valve are controlled to be closed. When the hydrogen pressure reducing valve and the tail exhaust solenoid valve are both closed, the timer is started, and the third pressure acquisition result of the second pressure sensor is obtained at the same time. When the timing value of the timer reaches the preset timing value, the fourth pressure acquisition result of the second pressure sensor is obtained;

[0035] Based on the third pressure collection result, the fourth pressure collection result and the preset timing value, it is determined whether hydrogen leakage occurs in the hydrogen fuel cell.

[0036] In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0037] When entering the hydrogen leakage detection state, the first air shut-off valve is controlled to be closed, the second air shut-off valve is controlled to be closed, and the air bypass valve is controlled to be opened; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, the air compressor is controlled to start, the speed of the air compressor is set to a preset speed, and whether the speed of the air compressor is within a first preset range is monitored in real time;

[0038] When the speed of the air compressor is within a first preset range, the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve are controlled to open;

[0039] Obtaining a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determining whether an inlet pressure of the hydrogen injector meets the leakage detection requirement based on the first pressure acquisition result, and determining whether an inlet hydrogen pressure of the stack meets the leakage detection requirement based on the second pressure acquisition result;

[0040] When the inlet pressure and the hydrogen pressure entering the stack meet the requirements, the hydrogen pressure reducing valve and the tail exhaust solenoid valve are controlled to be closed. When the hydrogen pressure reducing valve and the tail exhaust solenoid valve are both closed, the timer is started, and the third pressure acquisition result of the second pressure sensor is obtained at the same time. When the timing value of the timer reaches the preset timing value, the fourth pressure acquisition result of the second pressure sensor is obtained;

[0041] Based on the third pressure collection result, the fourth pressure collection result and the preset timing value, it is determined whether hydrogen leakage occurs in the hydrogen fuel cell.

[0042] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0043] When entering the hydrogen leakage detection state, the first air shut-off valve is controlled to be closed, the second air shut-off valve is controlled to be closed, and the air bypass valve is controlled to be opened; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, the air compressor is controlled to start, the speed of the air compressor is set to a preset speed, and whether the speed of the air compressor is within a first preset range is monitored in real time;

[0044] When the speed of the air compressor is within a first preset range, the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve are controlled to open;

[0045] Obtaining a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determining whether an inlet pressure of the hydrogen injector meets the leakage detection requirement based on the first pressure acquisition result, and determining whether an inlet hydrogen pressure of the stack meets the leakage detection requirement based on the second pressure acquisition result;

[0046] When the inlet pressure and the hydrogen pressure entering the stack meet the requirements, the hydrogen pressure reducing valve and the tail exhaust solenoid valve are controlled to be closed. When the hydrogen pressure reducing valve and the tail exhaust solenoid valve are both closed, the timer is started, and the third pressure acquisition result of the second pressure sensor is obtained at the same time. When the timing value of the timer reaches the preset timing value, the fourth pressure acquisition result of the second pressure sensor is obtained;

[0047] Based on the third pressure collection result, the fourth pressure collection result and the preset timing value, it is determined whether hydrogen leakage occurs in the hydrogen fuel cell.

[0048] The hydrogen leakage detection method, device, computer equipment, storage medium and computer program product of the above-mentioned hydrogen fuel cell, on the one hand, by controlling the first air shut-off valve to close, the second air shut-off valve to close and the air bypass valve to open when entering the hydrogen leakage detection state; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, controlling the air compressor to start, setting the speed of the air compressor to a preset speed, and monitoring in real time whether the speed of the air compressor is within a first preset range; when the speed of the air compressor is within the first preset range, controlling the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve to open; obtaining the first pressure acquisition result of the first pressure sensor and the second pressure acquisition result of the second pressure sensor The collection result is determined based on the first pressure collection result, whether the inlet pressure of the hydrogen injector meets the leakage detection requirements, and whether the inlet hydrogen pressure meets the leakage detection requirements based on the second pressure collection result; when the inlet pressure and the inlet hydrogen pressure meet the requirements, the hydrogen pressure reducing valve and the tail exhaust solenoid valve are controlled to be closed, and when the hydrogen pressure reducing valve and the tail exhaust solenoid valve are closed, the timer is started, and the third pressure collection result of the second pressure sensor is obtained at the same time, and when the timing value of the timer reaches the preset timing value, the fourth pressure collection result of the second pressure sensor is obtained; based on the third pressure collection result, the fourth pressure collection result and the preset timing value, it is determined whether the hydrogen of the hydrogen fuel cell is leaked, thereby realizing the hydrogen leakage detection of the hydrogen fuel cell. On the other hand, since the present application only uses the existing pressure sensor in the fuel cell system to realize the hydrogen leakage detection of the hydrogen fuel cell, and no new sensors or other components are added, the cost and the layout space of the fuel cell system are greatly saved, and the reliability of the system is improved. On the other hand, since the air output by the air compressor dilutes the hydrogen in the air exhaust pipeline, the safety of the fuel cell system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic flow chart of a method for detecting hydrogen leakage of a hydrogen fuel cell in one embodiment;

[0050] Figure 2A schematic diagram of the structure of a fuel cell system in one embodiment;

[0051] Figure 3 A schematic flow chart of a method for detecting hydrogen leakage of a hydrogen fuel cell in one embodiment;

[0052] Figure 4 is a structural block diagram of a hydrogen leakage detection device for a hydrogen fuel cell in one embodiment;

[0053] Figure 5 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0055] It is understood that the terms "first", "second", etc. used in this application can be used in this article to describe various professional terms, but unless otherwise specified, these professional terms are not limited by these terms. These terms are only used to distinguish one professional term from another professional term. For example, without departing from the scope of this application, the first pressure collection result and the second pressure collection result can be the same or different.

[0056] The working principle of a hydrogen fuel cell is to send hydrogen to the negative electrode of the hydrogen fuel cell. After the action of the catalyst, an electron in the hydrogen atom is separated, and the hydrogen ion that has lost the electron passes through the proton exchange membrane to reach the positive electrode of the hydrogen fuel cell. Since the electron cannot pass through the proton exchange membrane, it can only reach the positive electrode of the hydrogen fuel cell through the external circuit, thereby generating current in the external circuit.

[0057] However, the existing hydrogen fuel cell technology is not mature enough. After long-term use, the internal circuits and the outer shell of the hydrogen fuel cell are prone to aging, resulting in hydrogen leakage. Since hydrogen is flammable, it is a safety hazard for new energy vehicles. Therefore, a hydrogen leakage detection method for hydrogen fuel cells is urgently needed.

[0058] In view of the problems existing in the above-mentioned related technologies, an embodiment of the present invention provides a hydrogen leak detection method for a hydrogen fuel cell, which can be applied to a server, a terminal, or a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. Among them, the server can be implemented with an independent server or a server cluster composed of multiple servers. The terminal can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, Internet of Things devices and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, etc. Portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. It should be noted that the numbers of "multiple" and the like mentioned in each embodiment of the present application all refer to the number of "at least two", for example, "multiple" refers to "at least two".

[0059] In one embodiment, Figure 1 As shown, a hydrogen leakage detection method for a hydrogen fuel cell is provided. This embodiment is illustrated by applying the method to a fuel cell system. The system includes a hydrogen pressure reducing valve, a first pressure sensor, a second pressure sensor, a hydrogen ejector, a hydrogen injector, an air compressor, a tail exhaust solenoid valve, a first air shut-off valve, a second air shut-off valve and an air bypass valve; the first pressure sensor is installed after the hydrogen pressure reducing valve, and the second pressure sensor is installed on the hydrogen pipeline between the hydrogen injector and the hydrogen fuel cell stack; the method includes the following steps:

[0060] 102. When entering the hydrogen leakage detection state, control the first air shut-off valve to close, the second air shut-off valve to close, and the air bypass valve to open; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, control the air compressor to start, set the speed of the air compressor to a preset speed, and monitor in real time whether the speed of the air compressor is within a first preset range.

[0061] For ease of understanding, the positional relationship of the hydrogen pressure reducing valve, the first pressure sensor, the second pressure sensor, the hydrogen ejector, the hydrogen injector, the air compressor, the tail exhaust solenoid valve, the first air shut-off valve, the second air shut-off valve and the air bypass valve in the fuel cell system can be as follows: Figure 2 As shown. Figure 2 As shown, the fuel cell system may include a hydrogen fuel cell stack 1, a hydrogen storage tank 2, a hydrogen pressure reducing valve 3, a first pressure sensor 4, a hydrogen ejector 5, a hydrogen injector 6, a second pressure sensor 7, a gas-water separator 8, a tail exhaust solenoid valve 9, a water storage tank 10, an air compressor 11, a first air shut-off valve 12, a second air shut-off valve 13 and an air bypass valve 14.

[0062] It is understandable that the first air shutoff valve is provided with a position sensor, and the fuel cell system can determine whether the first air shutoff valve is closed by the opening of the position sensor. The second air shutoff valve and the air bypass valve are similar, and will not be described here. By controlling the first air shutoff valve to close and the second air shutoff valve to close, the hydrogen fuel cell stack is in a closed state; by controlling the air bypass valve to open, the air path is opened.

[0063] Among them, the preset speed can be 30,000 rpm.

[0064] 104. When the rotation speed of the air compressor is within a first preset range, the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve are controlled to open.

[0065] It can be understood that by controlling the opening of the hydrogen pressure reducing valve, medium-pressure hydrogen is supplied; by controlling the opening of the hydrogen injector, the hydrogen injector sprays hydrogen into the hydrogen fuel cell stack; and by controlling the opening of the tail exhaust solenoid valve, gas impurities in the hydrogen are removed.

[0066] It should be noted that, since a small amount of hydrogen will also be discharged from the air exhaust pipeline when the tail exhaust solenoid valve is open, the air output by the air compressor dilutes the hydrogen in the air exhaust pipeline, thereby improving the safety of the fuel cell system. The reason for real-time monitoring of whether the speed of the air compressor is within the first preset range is to ensure that the air output by the air compressor has a good dilution effect on the hydrogen in the air exhaust pipeline.

[0067] 106. Obtain a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determine whether an inlet pressure of the hydrogen injector meets the leakage detection requirement based on the first pressure acquisition result, and determine whether an inlet hydrogen pressure of the stack meets the leakage detection requirement based on the second pressure acquisition result.

[0068] Wherein, when both the inlet pressure and the hydrogen pressure entering the stack meet the requirements, the first pressure acquisition result of the first pressure sensor and the second pressure acquisition result of the second pressure sensor are continuously acquired.

[0069] 108. When the inlet pressure and the hydrogen inlet pressure meet the requirements, control the hydrogen pressure reducing valve and the tail exhaust solenoid valve to be closed. When the hydrogen pressure reducing valve and the tail exhaust solenoid valve are both closed, start the timer and obtain the third pressure collection result of the second pressure sensor at the same time. When the timing value of the timer reaches the preset timing value, obtain the fourth pressure collection result of the second pressure sensor.

[0070] It can be understood that by controlling the hydrogen pressure reducing valve and the tail exhaust solenoid valve to be closed, the anode is sealed to maintain the hydrogen pressure in the hydrogen fuel cell stack.

[0071] The preset timing value may be 360 ​​seconds. In practical applications, the preset timing value may be determined according to actual conditions.

[0072] 110. Determine whether hydrogen leakage occurs in the hydrogen fuel cell based on the third pressure collection result, the fourth pressure collection result, and a preset timing value.

[0073] In the above-mentioned hydrogen leakage detection method for a hydrogen fuel cell, when entering a hydrogen leakage detection state, the first air shut-off valve is controlled to be closed, the second air shut-off valve is controlled to be closed, and the air bypass valve is controlled to be opened; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, the air compressor is controlled to start, the speed of the air compressor is set to a preset speed, and whether the speed of the air compressor is within a first preset range is monitored in real time; when the speed of the air compressor is within the first preset range, the hydrogen pressure reducing valve, the hydrogen injector, and the tail exhaust solenoid valve are controlled to be opened; and a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor are obtained. Based on the first pressure acquisition result, determine whether the inlet pressure of the hydrogen injector meets the leakage detection requirements, and based on the second pressure acquisition result, determine whether the hydrogen pressure entering the stack meets the leakage detection requirements; when both the inlet pressure and the hydrogen pressure entering the stack meet the requirements, control the hydrogen pressure reducing valve and the tail exhaust solenoid valve to be closed, and when both the hydrogen pressure reducing valve and the tail exhaust solenoid valve are closed, start the timer and obtain the third pressure acquisition result of the second pressure sensor at the same time, and when the timing value of the timer reaches the preset timing value, obtain the fourth pressure acquisition result of the second pressure sensor; based on the third pressure acquisition result, the fourth pressure acquisition result and the preset timing value, determine whether the hydrogen of the hydrogen fuel cell is leaking.

[0074] On the one hand, hydrogen leakage detection of hydrogen fuel cells is realized. On the other hand, since the present application only uses the existing pressure sensor in the fuel cell system to realize hydrogen leakage detection of hydrogen fuel cells without adding new sensors or other components, the cost and layout space of the fuel cell system are greatly saved, and the reliability of the system is improved. On the other hand, since the air output by the air compressor dilutes the hydrogen in the air exhaust pipeline, the safety of the fuel cell system is improved.

[0075] In one embodiment, Figure 3 As shown, based on the first pressure acquisition result, determining whether the inlet pressure of the hydrogen injector meets the leakage detection requirements, and based on the second pressure acquisition result, determining whether the hydrogen pressure entering the stack meets the leakage detection requirements, includes:

[0076] 302. Obtain an absolute value of a first difference between a first pressure collection result and a first threshold value. When the absolute value of the first difference is within a second preset range, determine that the inlet pressure meets the leakage detection requirement. When the absolute value of the first difference is not within the second preset range, determine that the inlet pressure does not meet the leakage detection requirement.

[0077] Among them, the first threshold value can be 1000kPa, and the second preset range can be set to 0 to 20kPa. Specifically, the first threshold value and the second preset range can be set according to actual needs. For example, the first pressure acquisition result is 990kPa, the first threshold value is 1000kPa, and the second preset range can be set to 0 to 20kPa. Accordingly, the absolute value of the first difference is 10kPa, and the inlet pressure meets the leakage detection requirements.

[0078] 304. Obtain an absolute value of a second difference between the second pressure collection result and the second threshold value. When the absolute value of the second difference is within a third preset range, determine that the hydrogen pressure entering the stack meets the leakage detection requirement. When the absolute value of the second difference is not within the third preset range, determine that the hydrogen pressure entering the stack does not meet the leakage detection requirement.

[0079] The second threshold value may be 150 kPa, and the third preset range may be set to 0 to 20 kPa. Specifically, the second threshold value and the third preset range may be set according to actual needs. For example, the second pressure acquisition result is 140 kPa, the second threshold value is 150 kPa, and the third preset range may be set to 0 to 20 kPa. Accordingly, the absolute value of the second difference is 10 kPa, and the hydrogen pressure entering the stack meets the leakage detection requirements.

[0080] In this embodiment, by obtaining the absolute value of the first difference between the first pressure collection result and the first threshold value, when the absolute value of the first difference is within the second preset range, it is determined that the inlet pressure meets the leakage detection requirement, and when the absolute value of the first difference is not within the second preset range, it is determined that the inlet pressure does not meet the leakage detection requirement; the absolute value of the second difference between the second pressure collection result and the second threshold value is obtained, when the absolute value of the second difference is within the third preset range, it is determined that the hydrogen pressure entering the stack meets the leakage detection requirement, and when the absolute value of the second difference is not within the third preset range, it is determined that the hydrogen pressure entering the stack does not meet the leakage detection requirement.

[0081] In one embodiment, determining whether hydrogen gas in a hydrogen fuel cell leaks based on the third pressure collection result, the fourth pressure collection result, and a preset timing value includes:

[0082] A third difference between the third pressure collection result and the fourth pressure collection result is obtained, and a ratio between the third difference and a preset timing value is obtained.

[0083] Specifically, the process of obtaining the ratio can refer to formula (1):

[0084] S = (P1-P2) / t; (1)

[0085] It should be noted that in Formula 1, P1 represents the third pressure collection result, P2 represents the fourth pressure collection result, t represents the preset timing value, and S represents the hydrogen leakage rate, that is, the ratio.

[0086] When the ratio is greater than the third threshold, it is determined that hydrogen leakage occurs in the hydrogen fuel cell; otherwise, it is determined that hydrogen leakage does not occur in the hydrogen fuel cell.

[0087] Among them, the third threshold can be set to 0.01 kPa / s. The third threshold can be set based on engineering experience or international and domestic technical standards, and the embodiment of the present application does not make any specific limitations on this.

[0088] In this embodiment, since hydrogen leakage detection of the hydrogen fuel cell is achieved only by using the existing pressure sensor in the fuel cell system without adding new sensors or other components, the cost and layout space of the fuel cell system are greatly saved, and the system reliability is improved.

[0089] In one embodiment, after determining whether hydrogen gas in the hydrogen fuel cell leaks based on the third pressure collection result, the fourth pressure collection result and the preset timing value, the method includes:

[0090] The tail exhaust solenoid valve is controlled to open, and the fifth pressure collection result of the second pressure sensor is detected in real time. When the fifth pressure collection result is reduced to the fourth threshold, the air compressor and the hydrogen injector are controlled to be closed.

[0091] Specifically, when the hydrogen leak detection state is stopped, the tail exhaust solenoid valve is controlled to open, so that the hydrogen in the hydrogen fuel cell stack is discharged from the air exhaust pipeline. It can be understood that during the process of hydrogen being discharged from the air exhaust pipeline, the air output by the air compressor dilutes the hydrogen in the air exhaust pipeline, thereby improving the safety of the fuel cell system.

[0092] It can also be understood that when the fifth pressure collection result drops to the fourth threshold value, it can be considered that all the hydrogen in the hydrogen fuel cell stack has been discharged. Therefore, in this case, the air compressor and the hydrogen injector are controlled to be closed.

[0093] In this embodiment, the tail exhaust solenoid valve is controlled to open, and the fifth pressure acquisition result of the second pressure sensor is detected in real time. When the fifth pressure acquisition result drops to the fourth threshold, the air compressor and the hydrogen injector are controlled to close. Since the air output by the air compressor dilutes the hydrogen in the air exhaust pipeline, the safety of the fuel cell system is improved.

[0094] In one embodiment, the system further comprises a gas-water separator; the method further comprises:

[0095] When the fuel cell system operates normally, the hydrogen pressure reducing valve, the hydrogen injector, the air compressor, the first air shut-off valve and the second air shut-off valve are controlled to open, the air bypass valve is controlled to close, and the tail exhaust solenoid valve is periodically controlled to open and close.

[0096] Or take the structure diagram of the fuel cell system as follows Figure 2 As shown in the figure, it can be understood that, through the above control process, the high-pressure hydrogen released from the hydrogen storage tank 2 is pressure-regulated by the hydrogen pressure reducing valve 3 and then enters the hydrogen ejector 5 as the primary fluid of the hydrogen ejector 5;

[0097] During the period when the tail exhaust solenoid valve 9 is closed, the low-pressure hydrogen separated from the gas-water separator 8 returns to the inlet of the hydrogen ejector 5 as the secondary fluid of the hydrogen ejector 5. Since the pressure of the primary fluid is higher and the pressure of the secondary fluid is lower, when the primary fluid flows out of the nozzle of the hydrogen ejector 5 at a high speed and enters the isobaric mixing chamber of the hydrogen ejector 5, a low-pressure area appears at the nozzle outlet. Under the action of the pressure difference, the secondary fluid is sucked into the hydrogen ejector 5, mixed with the primary fluid, and discharged from the diffuser section;

[0098] The mixed hydrogen enters the anode of the hydrogen fuel cell stack 1 through the hydrogen injector 6 to react; the residual hydrogen after the anode reaction exits the stack and enters the gas-water separator 8, and the mixed gas with hydrogen and a small amount of nitrogen after separation is discharged from the gas pipeline of the gas-water separator 8, and the water in the gas-water separator 8 enters the water storage tank 10 to be processed;

[0099] When the tail exhaust solenoid valve 9 is open, the gas is discharged into the air exhaust pipeline and discharged into the atmosphere together with the outgoing air; when the tail exhaust solenoid valve 9 is closed, the gas returns to the inlet of the hydrogen ejector 5, so that the outgoing hydrogen can be recycled;

[0100] When the first air shut-off valve 12 and the second air shut-off valve 13 are open, the air compressor 11 compresses the atmospheric pressure air and enters the cathode of the hydrogen fuel cell stack 1 through the first air shut-off valve 12 for reaction, and then is discharged from the stack air shut-off valve 13 .

[0101] In this embodiment, by periodically controlling the opening and closing of the tail exhaust solenoid valve, when the tail exhaust solenoid valve 9 is not opened, the low-pressure hydrogen separated from the gas-water separator 8 returns to the inlet of the hydrogen ejector 5 as the secondary fluid of the hydrogen ejector 5. Since the primary fluid pressure is high and the secondary fluid pressure is low, when the primary fluid flows out of the nozzle of the hydrogen ejector 5 at high speed and enters the isobaric mixing chamber of the hydrogen ejector 5, a low-pressure area appears at the nozzle outlet. Under the action of the pressure difference, the secondary fluid is sucked into the hydrogen ejector 5, mixed with the primary fluid, and discharged from the diffuser section; so that the hydrogen discharged from the stack is recycled. During the period when the tail exhaust solenoid valve 9 is opened, the hydrogen discharged from the stack is discharged into the air exhaust pipeline and discharged into the atmosphere together with the air discharged from the stack; it can be understood that the air discharged from the air shut-off valve 13 can dilute the hydrogen discharged from the air exhaust pipeline, thereby improving the safety of the fuel cell system.

[0102] In one embodiment, after real-time monitoring of whether the rotation speed of the air compressor is within a first preset range, the method includes:

[0103] When the rotation speed of the air compressor is not within the first preset range, the hydrogen fuel cell enters a hydrogen leakage detection interruption state.

[0104] Specifically, the hydrogen leakage detection interruption state means that subsequent control actions are not performed until the rotation speed of the air compressor is within a first preset range.

[0105] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0106] Based on the same inventive concept, the embodiment of the present application also provides a hydrogen leakage detection device for a hydrogen fuel cell for implementing the hydrogen leakage detection method for a hydrogen fuel cell involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of one or more hydrogen leakage detection devices for hydrogen fuel cells provided below can refer to the limitations of the hydrogen leakage detection method for hydrogen fuel cells above, and will not be repeated here.

[0107] In one embodiment, Figure 4 As shown, a hydrogen leakage detection device for a hydrogen fuel cell is provided, comprising: a first control module 402, a second control module 404, a first determination module 406, a third control module 408 and a second determination module 410, wherein:

[0108] The first control module 402 is used to control the first air shut-off valve to close, the second air shut-off valve to close, and the air bypass valve to open when entering the hydrogen leakage detection state; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, control the air compressor to start, set the speed of the air compressor to a preset speed, and monitor in real time whether the speed of the air compressor is within a first preset range;

[0109] The second control module 404 is used to control the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve to open when the speed of the air compressor is within a first preset range;

[0110] A first determination module 406 is used to obtain a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determine whether the inlet pressure of the hydrogen injector meets the leakage detection requirement based on the first pressure acquisition result, and determine whether the inlet hydrogen pressure meets the leakage detection requirement based on the second pressure acquisition result;

[0111] The third control module 408 is used to control the hydrogen pressure reducing valve and the tail exhaust solenoid valve to close when both the inlet pressure and the hydrogen pressure entering the stack meet the requirements, and when both the hydrogen pressure reducing valve and the tail exhaust solenoid valve are closed, start the timer and obtain the third pressure acquisition result of the second pressure sensor at the same time, and when the timing value of the timer reaches a preset timing value, obtain the fourth pressure acquisition result of the second pressure sensor;

[0112] The second determination module 410 is used to determine whether hydrogen leakage occurs in the hydrogen fuel cell based on the third pressure collection result, the fourth pressure collection result and the preset timing value.

[0113] In one embodiment, the first determining module 406 includes:

[0114] a first acquisition unit, configured to acquire an absolute value of a first difference between a first pressure acquisition result and a first threshold value, and determine that the inlet pressure meets the leakage detection requirement when the absolute value of the first difference is within a second preset range, and determine that the inlet pressure does not meet the leakage detection requirement when the absolute value of the first difference is not within the second preset range;

[0115] The second acquisition unit is used to obtain the absolute value of the second difference between the second pressure collection result and the second threshold value. When the absolute value of the second difference is within a third preset range, it is determined that the hydrogen pressure entering the stack meets the leakage detection requirement. When the absolute value of the second difference is not within the third preset range, it is determined that the hydrogen pressure entering the stack does not meet the leakage detection requirement.

[0116] In one embodiment, the second determining module 410 includes:

[0117] A third acquisition unit, used to acquire a third difference between the third pressure acquisition result and the fourth pressure acquisition result, and acquire a ratio between the third difference and a preset timing value;

[0118] The determination unit is used to determine that the hydrogen in the hydrogen fuel cell has leaked when the ratio is greater than a third threshold value, and vice versa, to determine that the hydrogen in the hydrogen fuel cell has not leaked.

[0119] In one embodiment, the system further comprises:

[0120] The fourth control module is used to control the tail exhaust solenoid valve to open, and detect the fifth pressure collection result of the second pressure sensor in real time. When the fifth pressure collection result drops to a fourth threshold, the air compressor and the hydrogen injector are controlled to be closed.

[0121] In one embodiment, the system further comprises:

[0122] The fifth control module is used to control the opening of the hydrogen pressure reducing valve, the hydrogen injector, the air compressor, the first air shut-off valve and the second air shut-off valve, control the closing of the air bypass valve, and periodically control the opening and closing of the tail exhaust solenoid valve when the fuel cell system is operating normally.

[0123] In one embodiment, the system further comprises:

[0124] The hydrogen leakage detection interruption state module is used to enter the hydrogen leakage detection interruption state of the hydrogen fuel cell when the rotation speed of the air compressor is not within a first preset range.

[0125] Each module in the hydrogen leakage detection device for the hydrogen fuel cell can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0126] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 5As shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store a first pressure acquisition result, a second pressure acquisition result, a third pressure acquisition result, a fourth pressure acquisition result and preset timing value data. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a hydrogen leakage detection method for a hydrogen fuel cell is implemented.

[0127] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0128] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0129] When entering the hydrogen leakage detection state, the first air shut-off valve is controlled to be closed, the second air shut-off valve is controlled to be closed, and the air bypass valve is controlled to be opened; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, the air compressor is controlled to start, the speed of the air compressor is set to a preset speed, and whether the speed of the air compressor is within a first preset range is monitored in real time;

[0130] When the speed of the air compressor is within a first preset range, the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve are controlled to open;

[0131] Obtaining a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determining whether an inlet pressure of the hydrogen injector meets the leakage detection requirement based on the first pressure acquisition result, and determining whether an inlet hydrogen pressure of the stack meets the leakage detection requirement based on the second pressure acquisition result;

[0132] When the inlet pressure and the hydrogen pressure entering the stack meet the requirements, the hydrogen pressure reducing valve and the tail exhaust solenoid valve are controlled to be closed. When the hydrogen pressure reducing valve and the tail exhaust solenoid valve are both closed, the timer is started, and the third pressure acquisition result of the second pressure sensor is obtained at the same time. When the timing value of the timer reaches the preset timing value, the fourth pressure acquisition result of the second pressure sensor is obtained;

[0133] Based on the third pressure collection result, the fourth pressure collection result and the preset timing value, it is determined whether hydrogen leakage occurs in the hydrogen fuel cell.

[0134] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0135] Obtaining an absolute value of a first difference between the first pressure acquisition result and the first threshold value, and determining that the inlet pressure meets the leakage detection requirement when the absolute value of the first difference is within a second preset range, and determining that the inlet pressure does not meet the leakage detection requirement when the absolute value of the first difference is not within the second preset range;

[0136] The absolute value of the second difference between the second pressure collection result and the second threshold value is obtained. When the absolute value of the second difference is within a third preset range, it is determined that the hydrogen pressure entering the stack meets the leakage detection requirement. When the absolute value of the second difference is not within the third preset range, it is determined that the hydrogen pressure entering the stack does not meet the leakage detection requirement.

[0137] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0138] Obtaining a third difference between the third pressure collection result and the fourth pressure collection result, and obtaining a ratio between the third difference and a preset timing value;

[0139] When the ratio is greater than the third threshold, it is determined that hydrogen leakage occurs in the hydrogen fuel cell; otherwise, it is determined that hydrogen leakage does not occur in the hydrogen fuel cell.

[0140] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0141] The tail exhaust solenoid valve is controlled to open, and the fifth pressure collection result of the second pressure sensor is detected in real time. When the fifth pressure collection result is reduced to the fourth threshold, the air compressor and the hydrogen injector are controlled to be closed.

[0142] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0143] When the fuel cell system operates normally, the hydrogen pressure reducing valve, the hydrogen injector, the air compressor, the first air shut-off valve and the second air shut-off valve are controlled to open, the air bypass valve is controlled to close, and the tail exhaust solenoid valve is periodically controlled to open and close.

[0144] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0145] When the rotation speed of the air compressor is not within the first preset range, the hydrogen fuel cell enters a hydrogen leakage detection interruption state.

[0146] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0147] When entering the hydrogen leakage detection state, the first air shut-off valve is controlled to be closed, the second air shut-off valve is controlled to be closed, and the air bypass valve is controlled to be opened; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, the air compressor is controlled to start, the speed of the air compressor is set to a preset speed, and whether the speed of the air compressor is within a first preset range is monitored in real time;

[0148] When the speed of the air compressor is within a first preset range, the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve are controlled to open;

[0149] Obtaining a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determining whether an inlet pressure of the hydrogen injector meets the leakage detection requirement based on the first pressure acquisition result, and determining whether an inlet hydrogen pressure of the stack meets the leakage detection requirement based on the second pressure acquisition result;

[0150] When the inlet pressure and the hydrogen pressure entering the stack meet the requirements, the hydrogen pressure reducing valve and the tail exhaust solenoid valve are controlled to be closed. When the hydrogen pressure reducing valve and the tail exhaust solenoid valve are both closed, the timer is started, and the third pressure acquisition result of the second pressure sensor is obtained at the same time. When the timing value of the timer reaches the preset timing value, the fourth pressure acquisition result of the second pressure sensor is obtained;

[0151] Based on the third pressure collection result, the fourth pressure collection result and the preset timing value, it is determined whether hydrogen leakage occurs in the hydrogen fuel cell.

[0152] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0153] Obtaining an absolute value of a first difference between the first pressure acquisition result and the first threshold value, and determining that the inlet pressure meets the leakage detection requirement when the absolute value of the first difference is within a second preset range, and determining that the inlet pressure does not meet the leakage detection requirement when the absolute value of the first difference is not within the second preset range;

[0154] The absolute value of the second difference between the second pressure collection result and the second threshold value is obtained. When the absolute value of the second difference is within a third preset range, it is determined that the hydrogen pressure entering the stack meets the leakage detection requirement. When the absolute value of the second difference is not within the third preset range, it is determined that the hydrogen pressure entering the stack does not meet the leakage detection requirement.

[0155] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0156] Obtaining a third difference between the third pressure collection result and the fourth pressure collection result, and obtaining a ratio between the third difference and a preset timing value;

[0157] When the ratio is greater than the third threshold, it is determined that hydrogen leakage occurs in the hydrogen fuel cell; otherwise, it is determined that hydrogen leakage does not occur in the hydrogen fuel cell.

[0158] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0159] The tail exhaust solenoid valve is controlled to open, and the fifth pressure collection result of the second pressure sensor is detected in real time. When the fifth pressure collection result is reduced to the fourth threshold, the air compressor and the hydrogen injector are controlled to be closed.

[0160] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0161] When the fuel cell system operates normally, the hydrogen pressure reducing valve, the hydrogen injector, the air compressor, the first air shut-off valve and the second air shut-off valve are controlled to open, the air bypass valve is controlled to close, and the tail exhaust solenoid valve is periodically controlled to open and close.

[0162] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0163] When the rotation speed of the air compressor is not within the first preset range, the hydrogen fuel cell enters a hydrogen leakage detection interruption state.

[0164] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0165] When entering the hydrogen leakage detection state, the first air shut-off valve is controlled to be closed, the second air shut-off valve is controlled to be closed, and the air bypass valve is controlled to be opened; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, the air compressor is controlled to start, the speed of the air compressor is set to a preset speed, and whether the speed of the air compressor is within a first preset range is monitored in real time;

[0166] When the speed of the air compressor is within a first preset range, the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve are controlled to open;

[0167] Obtaining a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determining whether an inlet pressure of the hydrogen injector meets the leakage detection requirement based on the first pressure acquisition result, and determining whether an inlet hydrogen pressure of the stack meets the leakage detection requirement based on the second pressure acquisition result;

[0168] When the inlet pressure and the hydrogen pressure entering the stack meet the requirements, the hydrogen pressure reducing valve and the tail exhaust solenoid valve are controlled to be closed. When the hydrogen pressure reducing valve and the tail exhaust solenoid valve are both closed, the timer is started, and the third pressure acquisition result of the second pressure sensor is obtained at the same time. When the timing value of the timer reaches the preset timing value, the fourth pressure acquisition result of the second pressure sensor is obtained;

[0169] Based on the third pressure collection result, the fourth pressure collection result and the preset timing value, it is determined whether hydrogen leakage occurs in the hydrogen fuel cell.

[0170] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0171] Obtaining an absolute value of a first difference between the first pressure acquisition result and the first threshold value, and determining that the inlet pressure meets the leakage detection requirement when the absolute value of the first difference is within a second preset range, and determining that the inlet pressure does not meet the leakage detection requirement when the absolute value of the first difference is not within the second preset range;

[0172] The absolute value of the second difference between the second pressure collection result and the second threshold value is obtained. When the absolute value of the second difference is within a third preset range, it is determined that the hydrogen pressure entering the stack meets the leakage detection requirement. When the absolute value of the second difference is not within the third preset range, it is determined that the hydrogen pressure entering the stack does not meet the leakage detection requirement.

[0173] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0174] Obtaining a third difference between the third pressure collection result and the fourth pressure collection result, and obtaining a ratio between the third difference and a preset timing value;

[0175] When the ratio is greater than the third threshold, it is determined that hydrogen leakage occurs in the hydrogen fuel cell; otherwise, it is determined that hydrogen leakage does not occur in the hydrogen fuel cell.

[0176] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0177] The tail exhaust solenoid valve is controlled to open, and the fifth pressure collection result of the second pressure sensor is detected in real time. When the fifth pressure collection result is reduced to the fourth threshold, the air compressor and the hydrogen injector are controlled to be closed.

[0178] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0179] When the fuel cell system operates normally, the hydrogen pressure reducing valve, the hydrogen injector, the air compressor, the first air shut-off valve and the second air shut-off valve are controlled to open, the air bypass valve is controlled to close, and the tail exhaust solenoid valve is periodically controlled to open and close.

[0180] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0181] When the rotation speed of the air compressor is not within the first preset range, the hydrogen fuel cell enters a hydrogen leakage detection interruption state.

[0182] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0183] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0184] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0185] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A hydrogen leak detection method for a hydrogen fuel cell, the method being applied to a fuel cell system, the system comprising a hydrogen pressure reducing valve, a first pressure sensor, a second pressure sensor, a hydrogen ejector, a hydrogen injector, an air compressor, a tail exhaust solenoid valve, a first air shut-off valve, a second air shut-off valve and an air bypass valve; the first pressure sensor is installed after the hydrogen pressure reducing valve, and the second pressure sensor is installed on the hydrogen pipeline between the hydrogen ejector and the hydrogen fuel cell stack; characterized in that, The method comprises: When entering the hydrogen leakage detection state, controlling the first air shut-off valve to be closed, the second air shut-off valve to be closed, and the air bypass valve to be opened; when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, controlling the air compressor to start, setting the speed of the air compressor to a preset speed, and monitoring in real time whether the speed of the air compressor is within a first preset range; When the speed of the air compressor is within the first preset range, controlling the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve to open; Obtaining a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determining whether an inlet pressure of the hydrogen injector meets a leakage detection requirement based on the first pressure acquisition result, and determining whether an inlet hydrogen pressure meets the leakage detection requirement based on the second pressure acquisition result; When both the inlet pressure and the hydrogen pressure entering the stack meet the requirements, the hydrogen pressure reducing valve and the tail exhaust solenoid valve are controlled to be closed, and when both the hydrogen pressure reducing valve and the tail exhaust solenoid valve are closed, a timer is started, and a third pressure acquisition result of the second pressure sensor is obtained at the same time, and when the timing value of the timer reaches a preset timing value, a fourth pressure acquisition result of the second pressure sensor is obtained; Based on the third pressure collection result, the fourth pressure collection result and the preset timing value, it is determined whether hydrogen leakage occurs in the hydrogen fuel cell.

2. The method according to claim 1, characterized in that The determining, based on the first pressure acquisition result, whether the inlet pressure of the hydrogen injector meets the leakage detection requirement, and determining, based on the second pressure acquisition result, whether the inlet hydrogen pressure meets the leakage detection requirement, includes: acquiring an absolute value of a first difference between the first pressure acquisition result and a first threshold value, and determining that the inlet pressure meets the leakage detection requirement when the absolute value of the first difference is within a second preset range, and determining that the inlet pressure does not meet the leakage detection requirement when the absolute value of the first difference is not within the second preset range; An absolute value of a second difference between the second pressure collection result and a second threshold value is obtained. When the absolute value of the second difference is within a third preset range, it is determined that the hydrogen pressure entering the stack meets the leakage detection requirement. When the absolute value of the second difference is not within the third preset range, it is determined that the hydrogen pressure entering the stack does not meet the leakage detection requirement.

3. The method according to claim 1, characterized in that The determining whether hydrogen gas of the hydrogen fuel cell leaks based on the third pressure collection result, the fourth pressure collection result and the preset timing value includes: Obtaining a third difference between the third pressure collection result and the fourth pressure collection result, and obtaining a ratio between the third difference and the preset timing value; When the ratio is greater than a third threshold, it is determined that hydrogen leakage occurs in the hydrogen fuel cell; otherwise, it is determined that hydrogen leakage does not occur in the hydrogen fuel cell.

4. The method according to claim 1, characterized in that: After determining whether hydrogen gas of the hydrogen fuel cell leaks based on the third pressure collection result, the fourth pressure collection result and the preset timing value, the method includes: The tail exhaust solenoid valve is controlled to open, and a fifth pressure acquisition result of the second pressure sensor is detected in real time. When the fifth pressure acquisition result decreases to a fourth threshold, the air compressor and the hydrogen injector are controlled to close.

5. The method according to claim 1, characterized in that The system further includes a gas-water separator; and the method further includes: When the fuel cell system operates normally, the hydrogen pressure reducing valve, the hydrogen injector, the air compressor, the first air shut-off valve and the second air shut-off valve are controlled to open, the air bypass valve is controlled to close, and the tail exhaust solenoid valve is periodically controlled to open and close.

6. The method according to claim 1, characterized in that After the real-time monitoring of whether the rotation speed of the air compressor is within a first preset range, the method includes: When the rotation speed of the air compressor is not within the first preset range, the hydrogen fuel cell enters a hydrogen leakage detection interruption state.

7. A hydrogen leakage detection device for a hydrogen fuel cell, characterized in that: The device comprises: A hydrogen pressure reducing valve, a first pressure sensor, a second pressure sensor, a hydrogen ejector, a hydrogen injector, an air compressor, a tail exhaust solenoid valve, a first air shut-off valve, a second air shut-off valve and an air bypass valve; the first pressure sensor is installed after the hydrogen pressure reducing valve, and the second pressure sensor is installed on the hydrogen pipeline between the hydrogen ejector and the hydrogen fuel cell stack; a first control module, configured to control the first air shut-off valve to be closed, the second air shut-off valve to be closed, and the air bypass valve to be opened when entering a hydrogen leakage detection state; and to control the air compressor to be started when the air bypass valve is opened and the first air shut-off valve and the second air shut-off valve are both closed, to set the speed of the air compressor to a preset speed, and to monitor in real time whether the speed of the air compressor is within a first preset range; A second control module, configured to control the hydrogen pressure reducing valve, the hydrogen injector and the tail exhaust solenoid valve to open when the rotation speed of the air compressor is within the first preset range; a first determination module, configured to obtain a first pressure acquisition result of the first pressure sensor and a second pressure acquisition result of the second pressure sensor, determine whether an inlet pressure of the hydrogen injector meets a leakage detection requirement based on the first pressure acquisition result, and determine whether an inlet hydrogen pressure of the stack meets the leakage detection requirement based on the second pressure acquisition result; a third control module, configured to control the hydrogen pressure reducing valve and the tail exhaust solenoid valve to be closed when both the inlet pressure and the hydrogen pressure entering the stack meet the requirements, start a timer when both the hydrogen pressure reducing valve and the tail exhaust solenoid valve are closed, and simultaneously obtain a third pressure acquisition result of the second pressure sensor, and obtain a fourth pressure acquisition result of the second pressure sensor when the timing value of the timer reaches a preset timing value; The second determination module is used to determine whether the hydrogen of the hydrogen fuel cell leaks based on the third pressure collection result, the fourth pressure collection result and the preset timing value.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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