Vehicle-mounted liquid hydrogen supply system and vehicle thereof

Abstract

The vehicle-mounted liquid hydrogen supply system comprises a fuel cell system, a liquid hydrogen bottle, a hydrogen supply system, a pressure balance valve and a control system, and a gas phase space of the liquid hydrogen bottle is connected with a safety valve; the hydrogen supply system comprises a hydrogen compressor and a high-pressure buffer tank which are connected in series through a hydrogen supply pipeline, one end of the hydrogen supply pipeline is connected with the liquid phase space of the liquid hydrogen bottle, and the other end is connected with the fuel cell system; one end of the pressure balance valve is connected with the gas phase space of the liquid hydrogen bottle through a balance pipeline, and the other end is connected with the high-pressure buffer tank through a balance pipeline; the control system is connected with the safety valve and the pressure balance valve, when the pressure in the liquid hydrogen bottle is larger than a first set threshold value, the control system controls the safety valve to be opened, when the pressure in the liquid hydrogen bottle is smaller than a second set threshold value, the control system controls the pressure balance valve to be opened, and the first set threshold value is larger than the second set threshold value. Heat exchange paths between the system and the outside are greatly reduced, heat leakage is remarkably reduced, and supercritical risks are avoided.

Description

Technical Field

[0001] This application relates to the field of vehicle-mounted liquid hydrogen supply systems, specifically to a vehicle-mounted liquid hydrogen supply system and the vehicle thereof. Background Technology

[0002] In existing technologies, liquid hydrogen is typically stored in cryogenic liquid form in liquid hydrogen cylinders. A self-pressurization system is needed to increase the pressure in the gas phase region of the liquid hydrogen cylinder, creating a pressure difference with the outlet of the pressure regulating valve. This pressure difference drives the liquid hydrogen out of the cylinder, where it undergoes a phase change in a water bath vaporizer before entering a buffer tank in gaseous form for pressure stabilization and supplying the fuel cell system. To meet the design pressure requirements of the fuel cell system ejector, the inlet pressure of the fuel cell system is usually higher than the critical pressure of liquid hydrogen (12.9 bar). This results in the opening thresholds of the mechanical booster valve in the self-pressurization circuit and the safety valve on the liquid hydrogen cylinder being higher than the critical pressure. This means that during operation or long-term storage, the pressure inside the cylinder exceeds the critical pressure. As the temperature rises, the hydrogen inside the cylinder enters a supercritical state. Since the density of hydrogen is extremely sensitive to temperature and pressure, even a slight temperature rise can trigger an exponential pressure spike, increasing the risk of pressure runaway. Summary of the Invention

[0003] This application provides an on-board liquid hydrogen supply system and the vehicle thereof, which can solve the problem in the prior art where the pressure inside the liquid hydrogen cylinder exceeds the critical pressure when supplying hydrogen through self-pressurization.

[0004] In a first aspect, embodiments of this application provide an on-board liquid hydrogen supply system, comprising: a fuel cell system, a liquid hydrogen cylinder, a hydrogen supply system, a pressure balancing valve, and a control system. A safety valve is connected to the gas phase space of the liquid hydrogen cylinder. The hydrogen supply system includes a hydrogen compressor and a high-pressure buffer tank connected in series via a hydrogen supply pipeline. One end of the hydrogen supply pipeline is connected to the liquid phase space of the liquid hydrogen cylinder, and the other end is connected to the fuel cell system. One end of the pressure balancing valve is connected to the gas phase space of the liquid hydrogen cylinder via a balancing pipeline, and the other end is connected to the high-pressure buffer tank via a balancing pipeline. The control system is connected to the safety valve and the pressure balancing valve. When the pressure inside the liquid hydrogen cylinder is greater than a first set threshold, the control system controls the safety valve to open. When the pressure inside the liquid hydrogen cylinder is less than a second set threshold, the control system controls the pressure balancing valve to open. The first set threshold is greater than the second set threshold. The hydrogen compressor directly vaporizes and compresses liquid hydrogen from the liquid hydrogen cylinder and delivers it to the fuel cell system via a hydrogen supply pipeline. This replaces the self-pressurization circuit that relies on heat exchange, significantly reducing the heat exchange path between the system and the outside environment and substantially reducing heat leakage. Simultaneously, the hydrogen compressor continuously provides power flow, ensuring that the high-pressure buffer tank, acting as an intermediate gas storage unit for stable pressure, forms a closed-loop pressure regulation mechanism with the pressure balancing valve. When the liquid hydrogen cylinder pressure is lower than a second set threshold, the high-pressure buffer tank replenishes hydrogen to the liquid hydrogen cylinder through the balancing pipeline, preventing hydrogen supply interruptions due to excessively low pressure. The safety valve activates to release hydrogen when the pressure exceeds a first set threshold, ensuring that the cylinder pressure remains below the critical pressure of liquid hydrogen, mitigating the risk of supercriticality, and improving system safety while ensuring continuous hydrogen supply.

[0005] In conjunction with the first aspect, in one embodiment, the control system includes: a control unit and a pressure sensor, the control unit being connected to a hydrogen compressor and a high-pressure buffer tank; the pressure sensor being connected to the high-pressure buffer tank and the control unit, the pressure sensor being used to acquire the real-time pressure value of the high-pressure buffer tank and send the real-time pressure value of the high-pressure buffer tank to the control unit.

[0006] In conjunction with the first aspect, in one embodiment, the control unit is also connected to the fuel cell system and is used to output a hydrogen compressor speed control command based on the deviation between the real-time pressure value of the high-pressure buffer tank and the set pressure value, as well as the power of the fuel cell system.

[0007] In conjunction with the first aspect, in one embodiment, the opening pressure threshold of the safety valve is lower than the critical pressure threshold of the liquid hydrogen cylinder. The opening pressure threshold of the pressure balancing valve is lower than the opening pressure threshold of the safety valve.

[0008] In conjunction with the first aspect, in one embodiment, a low-pressure buffer tank and a water bath vaporizer are also connected in series on the hydrogen supply pipeline. Along the direction of liquid hydrogen supply, the hydrogen compressor is located upstream of the high-pressure buffer tank, the low-pressure buffer tank is located upstream of the hydrogen compressor, and the water bath vaporizer is located upstream of the low-pressure buffer tank.

[0009] In conjunction with the first aspect, in one embodiment, a one-way valve is provided between the hydrogen compressor and the high-pressure buffer tank.

[0010] In conjunction with the first aspect, in one embodiment, along the liquid hydrogen supply direction, a liquid outlet solenoid valve and a flow limiting valve are connected in series on the hydrogen supply pipeline, with the flow limiting valve located upstream of the water bath vaporizer.

[0011] In conjunction with the first aspect, in one embodiment, a pressure regulating valve is also connected in series on the hydrogen supply pipeline, and the pressure regulating valve is located between the high-pressure buffer tank and the fuel cell system.

[0012] In conjunction with the first aspect, in one embodiment, a liquid hydrogen pump is provided within the liquid phase space of the liquid hydrogen cylinder.

[0013] Secondly, embodiments of this application provide a vehicle that includes the onboard liquid hydrogen supply system described above.

[0014] The beneficial effects of the technical solutions provided in this application include: This application provides an on-board liquid hydrogen supply system and vehicle thereof. The hydrogen compressor directly vaporizes and compresses the liquid hydrogen in the liquid hydrogen cylinder through the hydrogen supply pipeline and delivers it to the fuel cell system, replacing the self-pressurization circuit that relies on heat exchange. This significantly reduces the heat exchange path between the system and the outside world, and significantly reduces heat leakage. At the same time, the hydrogen compressor continuously provides power flow, ensuring that the high-pressure buffer tank, as an intermediate gas storage unit with stable pressure, forms a closed-loop pressure regulation mechanism with the pressure balance valve. When the liquid hydrogen cylinder pressure is less than a second set threshold, the high-pressure buffer tank replenishes hydrogen into the liquid hydrogen cylinder through the balance pipeline to avoid hydrogen supply interruption caused by excessively low pressure. The safety valve starts to release hydrogen when the pressure is greater than a first set threshold, ensuring that the pressure in the cylinder is always below the critical pressure of liquid hydrogen, avoiding the risk of supercriticality. While ensuring the continuity of hydrogen supply, the system safety is improved. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the on-board liquid hydrogen supply system of this application.

[0016] In the diagram: 1. Hydrogen supply system; 11. Liquid outlet solenoid valve; 12. Flow control valve; 13. Water bath vaporizer; 14. Low-pressure buffer tank; 15. Hydrogen compressor; 16. Check valve; 17. High-pressure buffer tank; 18. Pressure regulating valve; 2. Pressure balancing system; 21. Pressure balancing valve; 3. Fuel cell system; 4. Liquid hydrogen cylinder; 41. Safety valve; 5. Control system; 51. Control unit; 52. Pressure sensor. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0018] This application provides an on-board liquid hydrogen supply system and the vehicle thereof, which can solve the problem in the prior art where the pressure inside the liquid hydrogen cylinder exceeds the critical pressure when supplying hydrogen through self-pressurization.

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0020] See Figure 1 In a first aspect, embodiments of this application provide an on-board liquid hydrogen supply system, comprising: a fuel cell system 3, a liquid hydrogen cylinder 4, a hydrogen supply system 1, a pressure balancing valve 21, and a control system 5. A safety valve 41 is connected to the gas phase space of the liquid hydrogen cylinder 4. The hydrogen supply system 1 includes a hydrogen compressor 15 and a high-pressure buffer tank 17 connected in series via a hydrogen supply pipeline. One end of the hydrogen supply pipeline is connected to the liquid phase space of the liquid hydrogen cylinder 4, and the other end is connected to the fuel cell system 3. One end of the pressure balancing valve 21 is connected to the gas phase space of the liquid hydrogen cylinder 4 via a balancing pipeline, and the other end is connected to the high-pressure buffer tank 17 via a balancing pipeline. The control system 5 is connected to the safety valve 41 and the pressure balancing valve 21. When the pressure inside the liquid hydrogen cylinder 4 is greater than a first set threshold, the control system 5 controls the safety valve 41 to open. When the pressure inside the liquid hydrogen cylinder 4 is less than a second set threshold, the control system 5 controls the pressure balancing valve 21 to open. The first set threshold is greater than the second set threshold.

[0021] In this application, the hydrogen compressor 15 directly vaporizes and compresses the liquid hydrogen in the liquid hydrogen cylinder 4 and delivers it to the fuel cell system 3 through the hydrogen supply pipeline, replacing the self-pressurization circuit that relies on heat exchange. This significantly reduces the heat exchange path between the system and the outside world, and significantly reduces heat leakage. At the same time, the hydrogen compressor 15 continuously provides power flow, ensuring that the high-pressure buffer tank 17, as an intermediate gas storage unit with stable pressure, forms a closed-loop pressure regulation mechanism with the pressure balance valve 21 in the pressure balance system 2. When the pressure in the liquid hydrogen cylinder 4 is less than the second set threshold, the high-pressure buffer tank 17 replenishes hydrogen into the liquid hydrogen cylinder 4 through the balance pipeline to avoid hydrogen supply interruption caused by excessively low pressure. The safety valve 41 starts to discharge hydrogen when the pressure is greater than the first set threshold, ensuring that the pressure inside the cylinder is always lower than the critical pressure of liquid hydrogen, completely avoiding the risk of supercriticality. While ensuring the continuity of hydrogen supply, the system safety is improved.

[0022] In this application, the opening pressure threshold of safety valve 41 is set lower than the critical pressure threshold of liquid hydrogen cylinder 4; the opening pressure threshold of pressure balance valve 21 is lower than the opening pressure threshold of safety valve 41. In this application, the first set threshold is set to 12 bar, the second set threshold is set to 8 bar, and the critical pressure threshold of liquid hydrogen cylinder 4 is 12.9 bar. The pressure state inside liquid hydrogen cylinder 4 is monitored in real time by control system 5. Specifically, control system 5 includes: control unit 51 and pressure sensor 52. Control unit 51 is connected to hydrogen compressor 15 and high-pressure buffer tank 17; pressure sensor 52 is connected to high-pressure buffer tank 17 and control unit 51. Pressure sensor 52 is used to collect the real-time pressure value of high-pressure buffer tank 17 and send the real-time pressure value of high-pressure buffer tank 17 to control unit 51.

[0023] The safety valve 41 is also set to open at a threshold of 12 bar. When the pressure inside the liquid hydrogen cylinder 4 exceeds the first set threshold (12 bar), the safety valve 41 is automatically opened to release excess hydrogen (e.g., by releasing hydrogen into the atmosphere) to prevent pressure accumulation and thus reduce the pressure inside the liquid hydrogen cylinder 4. The threshold (12 bar) of the safety valve 41 is set below the critical pressure of liquid hydrogen (12.9 bar) to ensure that the pressure inside the liquid hydrogen cylinder 4 is always within a safe range. Under the action of the safety valve 41, the pressure inside the liquid hydrogen cylinder 4 is always below the critical pressure of 12.9 bar, whether the liquid hydrogen system is in operation or during long-term storage, thus completely avoiding the risk of supercritical hydrogen supply.

[0024] During the pressure balancing process within liquid hydrogen cylinder 4, one end of pressure balancing valve 21 is connected to the gas phase space of liquid hydrogen cylinder 4 via a pipeline, and the other end is connected to high-pressure buffer tank 17 via a pipeline. Pressure balancing valve 21 opens and closes based on the balance between the preload of its built-in spring and the gas pressure. Optionally, the threshold value of pressure balancing valve 21 can be set to 8 bar. When the pressure within liquid hydrogen cylinder 4 falls below the second set threshold (8 bar), pressure balancing valve 21 opens, allowing hydrogen from high-pressure buffer tank 17 to replenish liquid hydrogen cylinder 4, maintaining pressure stability and keeping the pressure within liquid hydrogen cylinder 4 within a stable range of approximately 8 bar. High-pressure buffer tank 17, as an intermediate gas storage unit for pressure stabilization, works in conjunction with pressure balancing valve 21 to form a closed-loop pressure regulation mechanism, effectively suppressing pressure fluctuations caused by fuel cell power fluctuations and preventing hydrogen supply interruptions.

[0025] In addition to the above-mentioned equipment, the on-board liquid hydrogen supply system also includes a low-pressure buffer tank 14 and a water bath vaporizer 13 connected in series on the hydrogen supply pipeline. Along the liquid hydrogen supply direction, the hydrogen compressor 15 is located upstream of the high-pressure buffer tank 17, the low-pressure buffer tank 14 is located upstream of the hydrogen compressor 15, and the water bath vaporizer 13 is located upstream of the low-pressure buffer tank 14. The water bath vaporizer 13, located upstream of the low-pressure buffer tank 14, is responsible for vaporizing the liquid hydrogen flowing from the liquid hydrogen cylinder 4. The low-pressure buffer tank 14, located upstream of the hydrogen compressor 15, serves as a temporary storage unit for the vaporized hydrogen, maintaining the initial stability of the system pressure. The hydrogen compressor 15, located upstream of the high-pressure buffer tank 17, compresses the hydrogen from the low-pressure buffer tank 14 to the high-pressure buffer tank 17, achieving dynamic adjustment of the hydrogen supply pressure. During system operation, liquid hydrogen flows out from the liquid phase space of liquid hydrogen cylinder 4, is vaporized by water bath vaporizer 13, and then replenishes the low-pressure buffer tank 14. A one-way valve 16 is installed between hydrogen compressor 15 and high-pressure buffer tank 17. When hydrogen compressor 15 starts, hydrogen in low-pressure buffer tank 14 is compressed and transported to high-pressure buffer tank 17 through one-way valve 16, forming a pressure difference that drives liquid hydrogen to continuously flow out of liquid hydrogen cylinder 4, thereby replacing the traditional self-pressurization circuit that relies on heat exchange. This design effectively reduces the heat exchange path between the system and the outside world, significantly reducing heat leakage. At the same time, combined with the closed-loop control mechanism of pressure balance valve 21 and safety valve 41, when the pressure in liquid hydrogen cylinder 4 exceeds the safety threshold, safety valve 41 automatically opens to release hydrogen to avoid supercritical risks. When the pressure is lower than the set value, pressure balance valve 21 opens to replenish hydrogen to maintain pressure stability, ensuring a continuous and reliable hydrogen supply process and providing a safe and efficient liquid hydrogen supply guarantee for fuel cell system 3.

[0026] Furthermore, along the liquid hydrogen supply direction, a liquid outlet solenoid valve 11 and a flow limiting valve 12 are connected in series on the hydrogen supply pipeline, with the flow limiting valve 12 located upstream of the water bath vaporizer 13. A pressure regulating valve 18 is also connected in series on the hydrogen supply pipeline, positioned between the high-pressure buffer tank 17 and the fuel cell system 3. Specifically, the liquid outlet solenoid valve 11 is used to open and close the liquid hydrogen supply channel, enabling rapid response and safe isolation of the hydrogen supply. The flow limiting valve 12, located upstream of the water bath vaporizer 13, limits the flow rate of liquid hydrogen entering the vaporizer, ensuring a stable and controllable vaporization process and preventing vaporizer overload or system pressure fluctuations due to sudden flow changes. The pressure regulating valve 18, positioned between the high-pressure buffer tank 17 and the fuel cell system 3, adjusts the output hydrogen pressure in real time to maintain the stable hydrogen supply pressure required by the fuel cell system 3, improving the system's adaptability to dynamic loads.

[0027] In some embodiments, a liquid hydrogen pump is installed in the liquid phase space of the liquid hydrogen cylinder 4. The liquid hydrogen pump installed in the liquid phase space of the liquid hydrogen cylinder 4 serves as an auxiliary hydrogen supply device, providing initial liquid hydrogen delivery capacity during system startup or under low power demand conditions. It forms a cooperative working mechanism with the hydrogen compressor 15—when the hydrogen compressor 15 starts, the liquid hydrogen pump helps maintain the pressure inside the liquid hydrogen cylinder 4, ensuring that the pressure in the low-pressure buffer tank 14 remains lower than the pressure in the liquid hydrogen cylinder 4, driving a stable outflow of liquid hydrogen, while avoiding additional energy consumption caused by the liquid hydrogen pump working alone.

[0028] The liquid hydrogen supply process is as follows: Before system startup, the hydrogen compressor 15 is in a stopped state. Through the natural regulation of the pressure balance valve 21, the pressure in the low-pressure buffer tank 14 and the pressure in the liquid hydrogen cylinder 4 are maintained in a balance range of approximately 8 bar, ensuring the system is in a stable standby state. When the hydrogen supply command is triggered, the control system 5 starts the hydrogen compressor 15. The compressor continuously compresses the hydrogen in the low-pressure buffer tank 14 and delivers it to the high-pressure buffer tank 17 through the one-way valve 16, causing the pressure in the low-pressure buffer tank 14 to drop rapidly. Since the pressure in the low-pressure buffer tank 14 is lower than the pressure in the liquid hydrogen cylinder 4 (stabilized at around 8 bar), liquid hydrogen flows out steadily from the liquid phase space of the liquid hydrogen cylinder 4 under the drive of the pressure difference. The outflowing liquid hydrogen is vaporized by the water bath vaporizer 13 and then replenished back to the low-pressure buffer tank 14, forming a closed-loop hydrogen supply path. This process does not rely on a self-pressurizing loop that depends on heat exchange; it directly drives the liquid hydrogen flow through the pressure difference, effectively reducing the heat exchange path between the system and the outside world and significantly reducing heat leakage. Meanwhile, the continuous operation of the hydrogen compressor 15 maintains the pressure difference between the low-pressure buffer tank 14 and the liquid hydrogen cylinder 4, ensuring the continuity and stability of the liquid hydrogen supply. The vaporization efficiency of the water bath vaporizer 13 is matched with the replenishment rate of the low-pressure buffer tank 14 to avoid pressure instability caused by flow fluctuations. The entire hydrogen supply process is monitored and dynamically adjusted in real time by the control system 5, ensuring a stable and safe hydrogen supply for the fuel cell system 3 during vehicle operation.

[0029] Based on the above embodiments, in this embodiment, the control unit 51 is also connected to the fuel cell system 3 and is used to output the speed control command of the hydrogen compressor 15 according to the deviation between the real-time pressure value of the high-pressure buffer tank 17 and the set pressure value and the power of the fuel cell system 3.

[0030] The hydrogen compressor 15 is controlled as follows: the control unit 51 communicates with the fuel cell system 3 in real time. Based on the deviation between the real-time pressure value in the high-pressure buffer tank 17 and the set pressure value (16 bar), and the current power demand of the fuel cell system 3, the control unit dynamically outputs the speed control command for the hydrogen compressor 15. The pressure in the high-pressure buffer tank 17 is set to 16 bar to meet the inlet pressure requirement of the ejector and ensure compatibility between the hydrogen supply system 1 and the fuel cell. The speed control of the hydrogen compressor 15 adopts a fuzzy control strategy: the system first receives the hydrogen supply command from the fuel cell system 3, then collects the pressure data of the high-pressure buffer tank 17 in real time and calculates the deviation from the set pressure value, while combining the fuel cell power as the core input parameter. The fuzzy controller makes real-time decisions based on these signals and outputs the compressor speed command. The compressor adjusts its operating speed according to the command, continuously compressing the hydrogen in the low-pressure buffer tank 14 and delivering it to the high-pressure buffer tank 17, thereby stably maintaining the pressure level of the high-pressure buffer tank 17. During operation, the load fluctuations of fuel cell system 3 and the pressure changes caused by hydrogen consumption are monitored in real time, forming a closed-loop feedback mechanism—dynamically balancing hydrogen supply pressure and power demand through a continuous cycle of "monitoring-control-execution-feedback." This control method effectively avoids pressure oscillations caused by sudden power changes, ensuring the continuity and stability of the hydrogen supply process. At the same time, by eliminating the self-pressurization loop and reducing heat exchange paths, it further improves the insulation performance and hydrogen supply reliability of the liquid hydrogen system, providing precise and safe hydrogen source support for fuel cell vehicles.

[0031] Secondly, embodiments of this application provide a vehicle that includes the on-board liquid hydrogen supply system provided in any of the above embodiments of this application.

[0032] In this application, the hydrogen compressor 15 directly vaporizes and compresses the liquid hydrogen in the liquid hydrogen cylinder 4 and delivers it to the fuel cell system 3 through the hydrogen supply pipeline, replacing the self-pressurization circuit that relies on heat exchange. This significantly reduces the heat exchange path between the system and the outside world, and significantly reduces heat leakage. At the same time, the hydrogen compressor 15 continuously provides power flow, ensuring that the high-pressure buffer tank 17, as an intermediate gas storage unit with stable pressure, forms a closed-loop pressure regulation mechanism with the pressure balance valve 21. When the pressure in the liquid hydrogen cylinder 4 is less than the second set threshold, the high-pressure buffer tank 17 replenishes hydrogen into the liquid hydrogen cylinder 4 through the balance pipeline to avoid hydrogen supply interruption caused by excessively low pressure. The safety valve 41 starts to discharge hydrogen when the pressure is greater than the first set threshold, ensuring that the pressure inside the cylinder is always lower than the critical pressure of liquid hydrogen, completely avoiding the risk of supercriticality. While ensuring the continuity of hydrogen supply, the system safety is improved.

[0033] Thirdly, embodiments of this application provide an on-board liquid hydrogen supply system device, which can be a personal computer (PC), laptop computer, server, or other device with data processing capabilities.

[0034] In this embodiment, the on-board liquid hydrogen supply system may include a processor, a memory, a communication interface, and a communication bus.

[0035] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0036] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting devices within the onboard liquid hydrogen supply system, as well as interfaces used for interconnecting the onboard liquid hydrogen supply system with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0037] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0038] The processor can be a general-purpose processor, which can call the on-board liquid hydrogen supply system program stored in the memory and execute the on-board liquid hydrogen supply system provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the on-board liquid hydrogen supply system program is called can be referred to the various embodiments of the on-board liquid hydrogen supply system of this application, and will not be repeated here.

[0039] Fourthly, embodiments of this application also provide a computer-readable storage medium.

[0040] The present application has a computer-readable storage medium storing a program for an on-board liquid hydrogen supply system, wherein when the on-board liquid hydrogen supply system program is executed by a processor, it implements the steps of the on-board liquid hydrogen supply system as described above.

[0041] The method implemented when the on-board liquid hydrogen supply system program is executed can be referred to in the various embodiments of the on-board liquid hydrogen supply system of this application, and will not be repeated here.

[0042] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0043] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0044] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0045] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0046] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0047] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0048] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A vehicle-mounted liquid hydrogen supply system, characterized in that, It includes: Fuel cell system (3); Liquid hydrogen cylinder (4), with a safety valve (41) connected to the gas phase space of the liquid hydrogen cylinder (4). The hydrogen supply system (1) includes a hydrogen compressor (15) and a high-pressure buffer tank (17) connected in series via a hydrogen supply pipeline. One end of the hydrogen supply pipeline is connected to the liquid phase space of the liquid hydrogen cylinder (4), and the other end is connected to the fuel cell system (3). Pressure balancing valve (21), one end of which is connected to the gas phase space of liquid hydrogen cylinder (4) through a balancing pipeline, and the other end is connected to high pressure buffer tank (17) through a balancing pipeline. The control system (5) is connected to the safety valve (41) and the pressure balance valve (21). When the pressure inside the liquid hydrogen cylinder (4) is greater than the first set threshold, the control system (5) controls the safety valve (41) to open. When the pressure inside the liquid hydrogen cylinder (4) is less than the second set threshold, the control system (5) controls the pressure balance valve (21) to open. The first set threshold is greater than the second set threshold.

2. The on-board liquid hydrogen supply system as described in claim 1, characterized in that, The control system (5) includes: Control unit (51), which is connected to hydrogen compressor (15) and high-pressure buffer tank (17); Pressure sensor (52) is connected to high pressure buffer tank (17) and control unit (51). The pressure sensor (52) is used to collect the real-time pressure value of high pressure buffer tank (17) and send the real-time pressure value of high pressure buffer tank (17) to control unit (51).

3. The on-board liquid hydrogen supply system as described in claim 2, characterized in that, The control unit (51) is also connected to the fuel cell system (3) and is used to output a speed control command for the hydrogen compressor (15) based on the deviation between the real-time pressure value of the high-pressure buffer tank (17) and the set pressure value, as well as the power of the fuel cell system (3).

4. The on-board liquid hydrogen supply system as described in claim 1, characterized in that, The opening pressure threshold of the safety valve (41) is lower than the critical pressure threshold of the liquid hydrogen cylinder (4). The opening pressure threshold of the pressure balancing valve (21) is lower than the opening pressure threshold of the safety valve (41).

5. The on-board liquid hydrogen supply system as described in claim 1, characterized in that, The hydrogen supply pipeline is also connected in series with a low-pressure buffer tank (14) and a water bath vaporizer (13). Along the direction of liquid hydrogen supply, the hydrogen compressor (15) is located upstream of the high-pressure buffer tank (17), the low-pressure buffer tank (14) is located upstream of the hydrogen compressor (15), and the water bath vaporizer (13) is located upstream of the low-pressure buffer tank (14).

6. The on-board liquid hydrogen supply system as described in claim 5, characterized in that, A one-way valve (16) is provided between the hydrogen compressor (15) and the high-pressure buffer tank (17).

7. The on-board liquid hydrogen supply system as described in claim 5, characterized in that, Along the direction of liquid hydrogen supply, the hydrogen supply pipeline is also connected in series with a liquid outlet solenoid valve (11) and a flow restriction valve (12), the flow restriction valve (12) being located upstream of the water bath vaporizer (13).

8. The on-board liquid hydrogen supply system as described in claim 5, characterized in that, A pressure regulating valve (18) is also connected in series on the hydrogen supply pipeline. The pressure regulating valve (18) is located between the high-pressure buffer tank (17) and the fuel cell system (3).

9. The on-board liquid hydrogen supply system as described in claim 1, characterized in that: A liquid hydrogen pump is installed in the liquid phase space of the liquid hydrogen bottle (4).

10. A vehicle, characterized in that, It includes the on-board liquid hydrogen supply system as described in any one of claims 1-9.

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