Hydrogen power system, vehicle and control method of hydrogen power system

Abstract

The invention relates to a hydrogen power system, a vehicle and a control method of the hydrogen power system.The hydrogen power system comprises a hydrogen supply pipeline, a hydrogen storage device, a pressure adjusting assembly and a power piece are sequentially connected to the hydrogen supply pipeline, an openable and closable air exhaust assembly is connected to the side of the hydrogen supply pipeline, and the air exhaust assembly is connected between the pressure adjusting assembly and the power piece; the air exhaust assembly is connected with an air storage tank, and the air storage tank is connected with the hydrogen supply pipeline in an on-off mode. The openable and closable air exhaust assembly is additionally arranged on the hydrogen supply pipeline, and through cooperative work of the air exhaust assembly and the pressure adjusting assembly, the response speed of the hydrogen power system can be increased by quickly responding to the pressure demand change of the power part. According to the hydrogen power system, hydrogen waste caused by emergency pressure relief due to sudden pipeline pressure increase caused by adjustment lag of a traditional system can be avoided, the working stability of the system is improved, the hydrogen utilization rate is increased, meanwhile, the pressure adjustment range adapted to the hydrogen power system can be widened, and the universality of the system is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of hydrogen vehicles, and in particular, to a hydrogen power system, a vehicle, and a control method for the hydrogen power system. Background Art

[0002] In existing hydrogen-powered vehicles, the hydrogen supply system of its hydrogen power system is mainly through high-pressure hydrogen storage bottles and low-pressure liquid hydrogen bottles, which supply hydrogen to different fuel cells or hydrogen internal combustion engines. During the hydrogen supply process, the hydrogen storage bottle's bottle mouth valve receives a command from the hydrogen system controller to open the bottle mouth valve. The hydrogen stored in the hydrogen storage bottle passes through the hydrogen outlet pipeline and is adjusted to the operating pressure of the fuel cell system or hydrogen internal combustion engine by the pressure reducing valve. However, in actual vehicle operation, the hydrogen pressure in its pipeline often fluctuates. Adjusting the pipeline pressure through the pressure reducing valve will cause the system to respond too slowly. Often during the adjustment process, the hydrogen inlet pipeline pressure exceeds the pressure threshold. At this time, the safety valve will be triggered and the atmosphere will be discharged through the safety valve to achieve emergency pressure relief, so as to ensure the normal operation of the vehicle fuel cell system or hydrogen internal combustion engine. This adjustment method not only makes the entire hydrogen power system respond too slowly, but also causes the pressure reducing valve and safety valve to start and stop frequently, which not only shortens the service life of the pressure reducing valve and safety valve, but also leads to the problem of hydrogen waste. Summary of the Invention

[0003] The present disclosure aims to provide a hydrogen power system, a vehicle and a control method for the hydrogen power system, so as to improve the response speed of the hydrogen power system and increase the utilization rate of hydrogen.

[0004] In order to achieve the above-mentioned objectives, the present disclosure provides a hydrogen power system, including a hydrogen supply pipeline, to which a hydrogen storage device, a pressure regulating assembly and a power component are connected in sequence, and an openable and closable air extraction assembly is connected to the hydrogen supply pipeline, and the air extraction assembly is connected between the pressure regulating assembly and the power component, and the air extraction assembly is connected to a gas storage tank, and the gas storage tank can be connected to the hydrogen supply pipeline in an on-off manner.

[0005] Optionally, the air extraction assembly includes a vacuum energy storage tank and a vacuum pump connected in sequence, the vacuum energy storage tank is arranged upstream of the vacuum pump, and the vacuum energy storage tank and the vacuum pump are respectively connected to the gas storage tank.

[0006] Optionally, the air extraction assembly includes a one-way valve arranged upstream of the vacuum energy storage tank.

[0007] Optionally, the pressure regulating assembly includes an overflow valve, a pressure regulating valve and a safety valve connected in sequence.

[0008] According to a second aspect of the present disclosure, a vehicle is provided, comprising the above-mentioned hydrogen power system.

[0009] According to a third aspect of the present disclosure, a method for controlling a hydrogen power system is provided. Using the above-mentioned hydrogen power system, the control method includes: Get the current pressure P between the power component and the air extraction component 实际 , and the target pressure P corresponding to the current working condition 目标 , and obtain the difference △P=P 实际 -P 目标 ; If the difference ΔP is greater than the first deviation threshold P1, the exhaust component is controlled to exhaust gas from the hydrogen supply pipeline.

[0010] Optionally, the gas extraction component includes a vacuum energy storage tank and a vacuum pump connected in sequence. In the step of controlling the gas extraction component to extract gas from the hydrogen supply pipeline if the difference ΔP is greater than a first deviation threshold P1, the control method includes: If the difference ΔP is greater than a second deviation threshold P2, controlling the vacuum pump to evacuate the hydrogen supply pipeline; If P1<ΔP≤P2, control the vacuum energy storage tank to evacuate the hydrogen supply pipeline.

[0011] Optionally, the target pressure P corresponding to the current working condition 目标 When the change occurs, the control method includes: Get the target pressure P of the changed working condition 变动后 Compared with the target pressure P of the working condition before the change 变动前 The difference △P 目标 ; In the difference △P 目标 When the pressure is greater than the change threshold value P3, the operating power of the vacuum pump is first increased, and the vacuum pump is controlled to evacuate the hydrogen supply pipeline; The current pressure P in the hydrogen supply line 实际 When the pressure is less than the adjustment threshold P0, the pressure adjustment component is controlled to adjust the intake pressure; The pressure regulating assembly controls the intake pressure to reach the target pressure P of the working condition after the change. 变动后 Then, reduce the operating power of the vacuum pump.

[0012] Optionally, when the current operating condition of the hydrogen power system is an idle condition, the control method includes: Control the vacuum pump to evacuate the hydrogen supply pipeline until the current pressure P in the hydrogen supply pipeline is 实际 Below the first safety threshold P4; Obtaining a first pressure rise rate v1 of the pressure value between the hydrogen storage device and the pressure regulating assembly within an interval time t; Obtaining a second pressure recovery rate v2 of the pressure value between the power component and the air pumping assembly within an interval time t; When the first pressure recovery rate v1 or the second pressure recovery rate v2 is greater than a rate threshold v, it is determined that the hydrogen supply pipeline is in a leaking state.

[0013] Optionally, when the hydrogen supply pipeline is in a leaking state, the control method includes: The hydrogen storage device is controlled to be disconnected from the pressure regulating assembly, and the vacuum pump is controlled to evacuate the hydrogen supply pipeline.

[0014] Optionally, when the hydrogen power system is shut down, the control method includes: Controlling the hydrogen storage device to be disconnected from the pressure regulating assembly; The exhaust assembly is controlled to exhaust gas from the hydrogen supply pipeline until the pressure in the hydrogen supply pipeline is lower than a second safety threshold value P5.

[0015] Through the above technical solution, an openable and closable exhaust assembly is added to the hydrogen supply pipeline. The coordinated operation of the exhaust assembly and the pressure regulating assembly can quickly respond to changes in the pressure demand of the power components, improving the response speed of the hydrogen power system. This can avoid the sudden increase in pipeline pressure caused by the regulation lag in traditional systems, improve the operating stability of the system, and also expand the pressure regulation range that the hydrogen power system can adapt to, improving the versatility of the system. In addition, the connection of the gas tank can also store the hydrogen extracted during the regulation of the exhaust assembly, so that the extracted hydrogen can be supplied to the hydrogen supply pipeline according to the pressure conditions of the hydrogen supply pipeline, which can effectively avoid the waste of hydrogen caused by emergency pressure relief and improve hydrogen utilization.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic diagram of a hydrogen power system according to an embodiment of the present disclosure.

[0018] Figure 2 It is a flowchart of a method for controlling a hydrogen power system according to an embodiment of the present disclosure.

[0019] Figure 3 is a flow chart of a control method for a hydrogen power system according to another embodiment of the present disclosure.

[0020] Description of Reference Numerals 10-Hydrogen supply pipeline; 100-Gas storage tank; 1-Hydrogen storage device; 11-Bottle mouth valve; 2-Pressure regulating assembly; 21-Overflow valve; 22-Pressure regulating valve; 23-Safety valve; 3-Power component; 4-Vacuum exhaust assembly; 41-Vacuum energy storage tank; 42-Vacuum pump; 43-One-way valve; 5-Three-way valve; 61-First sensor; 62-Second sensor. DETAILED DESCRIPTION

[0021] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0022] In this disclosure, unless otherwise indicated, the terms "first," "second," and the like are used to distinguish between different components and do not imply order or importance. Furthermore, in the following description, when referring to the accompanying drawings, unless otherwise indicated, the same reference numerals in different drawings represent the same or similar elements.

[0023] According to one embodiment of the present disclosure, Figure 1 As shown, a hydrogen power system is provided, including a hydrogen supply pipeline 10, to which a hydrogen storage device 1, a pressure regulating assembly 2 and a power component 3 are connected in sequence, and an openable and closable air extraction assembly 4 is connected to the hydrogen supply pipeline 10, the air extraction assembly 4 is connected between the pressure regulating assembly 2 and the power component 3, and the air extraction assembly 4 is connected to a gas storage tank 100, and the gas storage tank 100 can be connected to the hydrogen supply pipeline 10 in an on-off manner.

[0024] Through the above technical solution, an openable and closable exhaust assembly 4 is added to the hydrogen supply pipeline 10. Through the coordinated work of the exhaust assembly 4 and the pressure regulating assembly 2, the pressure demand changes of the power component 3 can be quickly responded to, improving the response speed of the hydrogen power system. It can avoid the sudden increase in pipeline pressure caused by the regulation lag in the traditional system, improve the working stability of the system, and at the same time, it can also increase the pressure regulation range that the hydrogen power system can adapt to, and improve the versatility of the system. In addition, the connection of the gas storage tank 100 can also store the hydrogen extracted during the regulation of the exhaust assembly 4, so that the extracted hydrogen can be supplied to the hydrogen supply pipeline 10 according to the pressure of the hydrogen supply pipeline 10, which can effectively avoid the waste of hydrogen caused by emergency pressure relief and improve the utilization rate of hydrogen.

[0025] It should be noted that the power component 3 can be at least one of a hydrogen fuel cell and a hydrogen internal combustion engine, that is, the hydrogen supply line 10 can be connected only to the hydrogen fuel cell, and can also be connected only to the hydrogen internal combustion engine, or both are connected at the same time, and the present disclosure does not limit this. A three-way valve 5 can be provided on the hydrogen supply line 10 to connect with the exhaust assembly 4, and the two flow channel openings of the three-way valve 5 located on the hydrogen supply line 10 can be kept long-pass to ensure that the hydrogen power system stably supplies hydrogen, and the flow channel opening connected to the three-way valve 5 and the exhaust assembly 4 can be controlled to open and close according to control requirements. It is also possible that the pipeline of the exhaust assembly 4 is connected to the hydrogen supply line 10, and a valve that can be opened and closed is provided on the pipeline, and the present disclosure does not limit this.

[0026] Further, if Figure 1 As shown, the exhaust assembly 4 may include a vacuum energy storage tank 41 and a vacuum pump 42 connected in sequence, and the vacuum energy storage tank 41 is arranged upstream of the vacuum pump 42. When the pressure of the hydrogen supply line 10 fluctuates within a small range, the vacuum energy of the vacuum energy storage tank 41 can be used preferentially, that is, the hydrogen supply line 10 is evacuated by the negative pressure of the vacuum energy storage tank 41, thereby reducing the number of starts and stops of the vacuum pump 42, reducing the power consumption of the vacuum pump 42, and extending the life of the vacuum pump 42. When the pressure fluctuation range of the hydrogen supply line 10 is large, the vacuum pump 42 is used to evacuate. The specific fluctuation ranges of the vacuum energy storage tank 41 and the vacuum pump 42 will be described in detail below. The vacuum energy storage tank 41 and the vacuum pump 42 can be connected to the gas tank 100 respectively, where the vacuum pump 42 can be directly connected to the gas tank 100, and when the vacuum pump 42 is evacuating, the extracted hydrogen can be directly supplied to the gas tank 100 for storage. Since the vacuum energy storage tank 41 is evacuated by utilizing the pressure difference between the vacuum energy storage tank 41 and the hydrogen supply pipeline 10, an openable and closable valve and an air pump can be connected between the vacuum energy storage tank 41 and the gas storage tank 100. When the gas in the vacuum energy storage tank 41 accumulates to a certain amount and cannot form a pressure difference with the hydrogen supply pipeline 10, the valve and the air pump between the vacuum energy storage tank 41 and the gas storage tank 100 are opened to introduce the gas in the vacuum energy storage tank 41 into the gas storage tank 100. At the same time, the air pressure in the vacuum energy storage tank 41 can be reduced, so that the vacuum energy storage tank 41 can continue to perform negative pressure evacuation.

[0027] To prevent hydrogen from flowing back into the hydrogen supply pipeline 10 and affecting the extraction effect of the extraction component 4, Figure 1 As shown, the exhaust assembly 4 may further include a one-way valve 43 disposed upstream of the vacuum energy storage tank 41 . The one-way valve 43 is located upstream of the vacuum energy storage tank 41 and the vacuum pump 42 to ensure the uniqueness of the exhaust direction.

[0028] According to one embodiment of the present disclosure, Figure 1As shown, the pressure regulating assembly 2 includes an overflow valve 21, a pressure regulating valve 22, and a safety valve 23 connected in sequence. The overflow valve 21 can be closed when the pressure in the hydrogen supply pipeline 10 increases abnormally, thereby cutting off the connection between the hydrogen storage device 1 and the power component 3. The pressure regulating valve 22 can adjust the hydrogen flow rate in the hydrogen supply pipeline 10. When a high-pressure operating condition is required, the opening of the pressure regulating valve 22 can be increased, and when a low-pressure operating condition is required, the opening of the pressure regulating valve 22 can be reduced. The safety valve 23 can be opened when the pressure in the hydrogen supply pipeline 10 suddenly increases and exceeds the set value, so as to quickly discharge the hydrogen into the atmosphere, achieve rapid pressure relief of the hydrogen supply pipeline 10, and prevent safety accidents such as explosions.

[0029] It should be noted that a bottle-mouth valve 11 is provided at the outlet of the hydrogen storage device 1 to control the connection between the hydrogen storage device 1 and the hydrogen supply pipeline 10. The hydrogen supply pipeline 10 can be provided with a sensor to obtain the hydrogen pressure on the hydrogen supply pipeline 10, or a first sensor 61 and a second sensor 62 can be provided respectively, wherein the first sensor 61 can be provided between the bottle-mouth valve 11 and the overflow valve 21, and the second sensor 62 can be provided between the exhaust assembly 4 and the power component 3, so as to obtain the hydrogen pressure at different positions on the hydrogen supply pipeline 10, which is not limited in this disclosure.

[0030] On the basis of the above scheme, the present disclosure also provides a vehicle, which includes the above-mentioned hydrogen power system, and the vehicle has all the beneficial effects of the above-mentioned hydrogen power system, which will not be repeated here. It should be noted that the vehicle may include a braking system, and its braking system is also provided with an exhaust assembly 4. The braking system and the hydrogen power system of the vehicle can be independently provided with exhaust assemblies 4, or they can share a set of exhaust assemblies 4. The present disclosure does not limit this. The power component 3 can be at least one of a hydrogen fuel cell and a hydrogen internal combustion engine, so that the hydrogen power system of the vehicle can be a hydrogen fuel cell power system, a hydrogen internal combustion engine power system, or a hybrid power system of a hydrogen fuel cell and a hydrogen internal combustion engine. The present disclosure does not limit this.

[0031] According to another aspect of the present disclosure, Figure 2 As shown, a control method for a hydrogen power system is provided. Using the above hydrogen power system, the control method includes step 201, that is, obtaining the current pressure P between the power component 3 and the exhaust component 4. 实际 , and the target pressure P corresponding to the current working condition 目标 , the current pressure P between the power component 3 and the suction component 4 实际 It can be obtained by the second sensor 62 mentioned above. After obtaining the two values, the difference between them can be obtained. 实际 -P 目标After obtaining the difference △P, step 202 is executed to determine whether △P>P1. When the difference △P is not greater than the first deviation threshold value P1, the system pressure is stable at this time, and there is no need to use the vacuum component 4 for regulation. The vacuum component 4 can be disconnected from the hydrogen supply pipeline 10, and the opening of the pressure regulating valve 22 is fixed to maintain the normal hydrogen inlet pressure balance. If the difference △P is greater than the first deviation threshold value P1, it means that the pressure value in the hydrogen supply pipeline 10 fluctuates too much at this time, and step 203 is executed, that is, the vacuum component 4 is controlled to pump air from the hydrogen supply pipeline 10. Specifically, the flow channel port connected to the vacuum component 4 in the three-way valve 5 can be opened, and the vacuum component 4 can be opened at the same time to enable the vacuum component 4 to pump air from the hydrogen supply pipeline 10. The vacuum assembly 4 can quickly respond to changes in the pressure demand of the power component 3 to improve the response speed of the hydrogen power system. By regulating the pressure of the hydrogen supply pipeline 10 through the vacuum assembly 4, it can not only avoid the sudden increase in pipeline pressure caused by the adjustment lag in the traditional system, thereby avoiding the waste of hydrogen caused by emergency pressure relief, but also improve the working stability and hydrogen utilization rate of the system, and at the same time, it can also improve the pressure adjustment range that the hydrogen power system can adapt to and improve the versatility of the system.

[0032] It should be noted that if ΔP<−P1, it means that the pressure in the hydrogen supply pipeline 10 is insufficient. At this time, the pressure regulating valve 22 can be controlled to increase its opening to ensure the gas supply to the power component 3.

[0033] Further, if Figure 3 As shown, when the exhaust component 4 includes a vacuum energy storage tank 41 and a vacuum pump 42 connected in sequence, when the difference △P is greater than the first deviation threshold P1 and the exhaust component 4 is controlled to exhaust the hydrogen supply pipeline 10, a second deviation threshold P2 having a value greater than the first deviation threshold P1 can be further set. Since the exhaust capacity of the vacuum pump 42 is higher than that of the vacuum energy storage tank 41, after step 201, step 301 can be executed, that is, judging whether △P>P2. If the difference △P is greater than the second deviation threshold P2, step 302 can be executed, that is, controlling the vacuum pump 42 to exhaust the hydrogen supply pipeline 10. If the difference △P is not greater than the second deviation threshold P2, step 303 is executed, that is, judging whether P1<△P≤P2. If P1<△P≤P2, step 304 is executed to control the vacuum energy storage tank 41 to exhaust the hydrogen supply pipeline 10. In this way, the number of starts and stops of the vacuum pump 42 can be reduced, the power consumption of the vacuum pump 42 can be reduced, and the life of the vacuum pump 42 can be extended. Here, the first deviation threshold P1 can be set to 0.01 MPa, and the second deviation threshold P2 can be set to 0.05 MPa. The first deviation threshold P1 and the second deviation threshold P2 can also be set according to needs, and this disclosure does not limit this.

[0034] The pumping power of the vacuum pump 42 can be adjusted according to the value of the difference △P. When the difference △P is too large, the power of the vacuum pump 42 can be appropriately increased to improve the pumping capacity of the vacuum pump 42. When the difference △P is small, a smaller power can be used when starting the vacuum pump 42 to reduce energy consumption while ensuring the control effect. It should be noted that since the vacuum pump 42 requires hundreds of milliseconds of mechanical response time from complete stop to full power operation, low-speed idling can eliminate this delay. Therefore, when the vacuum pump 42 is not needed to pump air from the hydrogen supply pipeline 10, the vacuum pump 42 can be turned off to reduce energy consumption, or it can be kept idling at a lower power to improve the response speed at startup. The present disclosure does not limit this.

[0035] Furthermore, the target pressure P corresponding to the current working condition 目标 When the pressure changes, the control method may further include the following steps: obtaining the target pressure P of the working condition after the change 变动后 Compared with the target pressure P of the working condition before the change 变动前 The difference △P 目标 , at the difference △P 目标 When the pressure is greater than the change threshold value P3, the vacuum pump 42 can no longer meet the pressure control of the hydrogen supply pipeline 10 by keeping the control power unchanged. Therefore, it is necessary to increase the operating power of the vacuum pump 42 and control the vacuum pump 42 to pump air into the hydrogen supply pipeline 10 until the current pressure P of the hydrogen supply pipeline 10 is 实际 When the pressure regulating component 2 controls the intake pressure to reach the target pressure P of the working condition after the change, the pressure regulating component 2 controls the intake pressure to reach the target pressure P of the working condition after the change. 变动后 After that, the operating power of the vacuum pump 42 is reduced to maintain normal control. Here, the target pressure P of the working condition after the change 变动后This can be predicted by the FCU (Fuel Cell Control Unit). For example, during sudden acceleration, the VCU (Vehicle Control Unit) receives the accelerator pedal signal and transmits it to the FCU. The FCU can then predict a sudden increase in fuel cell power demand and preset a target pressure. This allows the vacuum pump 42 to be activated at high power in advance, rapidly reducing the pressure in the hydrogen supply line 10. The variable threshold P3 can be set based on actual needs. For example, when power unit 3 is a hydrogen fuel cell, the required hydrogen inlet pressure is generally between 1.0 MPa and 1.8 MPa. When power unit 3 is a hydrogen internal combustion engine, the required hydrogen inlet pressure is generally between 2.5 MPa and 4 MPa. In a vehicle with a hybrid power system, that is, the power unit 3 includes both a hydrogen fuel cell and a hydrogen internal combustion engine, when the driving mode needs to be changed from a hydrogen fuel cell drive to a hydrogen internal combustion engine drive, or when the driving mode needs to be changed from a hydrogen internal combustion engine drive to a hydrogen fuel cell drive, the hydrogen inlet pressure usually needs to be changed by more than 1MPa. Therefore, the change threshold P3 can be set to 1MPa. Of course, it can also be set to other values ​​according to needs, and this disclosure does not limit this. The adjustment threshold P0 can also be set according to needs. When P 变动后 >P 变动前 or P 变动后 <P 变动前 When the adjustment threshold P0 can be set to the same value, it is also based on P 变动后 >P 变动前 or P 变动后 <P 变动前 The target working conditions are different, or according to the difference △P 目标 The adjustment threshold P0 is divided into different gears according to the change of the value, and the adjustment threshold P0 is set to different values, which is not limited in the present disclosure.

[0036] It should be noted that, taking the adjustment of the pressure regulating valve 22 in the pressure regulating assembly 2 as an example, when P 变动后 >P 变动前 When the pressure of the hydrogen supply pipeline 10 needs to be increased, if the pressure regulating component 2 is directly increased due to the excessive increase in the pressure, the hydrogen flow in the hydrogen supply pipeline 10 will suddenly increase, resulting in accumulation and wind resistance, which will affect the system response speed. Therefore, it is necessary to first increase the operating power of the vacuum pump 42 and control the vacuum pump 42 to quickly pump air from the hydrogen supply pipeline 10 until the current pressure P of the hydrogen supply pipeline 10 is reached. 实际Less than the adjustment threshold value P0, that is, at this time, the original hydrogen content of the hydrogen supply pipeline 10 will not be affected by the sudden increase in intake air. Then, the opening of the pressure regulating valve 22 is increased. At this time, the intake air in the hydrogen supply pipeline 10 will increase. At this time, since the vacuum pump 42 is already running at high power, hydrogen will not generate wind resistance in the hydrogen supply pipeline 10. After the pressure regulating valve 22 is adjusted to the appropriate opening, the power of the vacuum pump 42 is slowly reduced until the pressure in the hydrogen supply pipeline 10 stabilizes, and then the flow channel port connected to the vacuum component 4 in the three-way valve 5 is closed, and then the vacuum pump 42 is turned off or the vacuum pump 42 is maintained at low speed idling. Here, the operating power of the vacuum pump 42 can be increased to between 80% and 100% of the full power, and the low-speed idling of the vacuum pump 42 can be adjusted to 30% of the full power. This disclosure does not limit this.

[0037] When P 变动后 <P 变动前 When the pressure of the hydrogen supply pipeline 10 needs to be reduced, the pressure reduction range is too large. Therefore, it is necessary to increase the operating power of the vacuum pump 42 to quickly pump gas and improve the system response efficiency. The vacuum pump 42 is pumped until the current pressure P of the hydrogen supply pipeline 10 reaches 实际 When the pressure in the hydrogen supply pipeline 10 is less than the adjustment threshold value P0, that is, the original hydrogen content in the hydrogen supply pipeline 10 has dropped to a hydrogen content suitable for the current working conditions, the opening of the pressure regulating valve 22 is then reduced to reduce the intake flow of the hydrogen supply pipeline 10, and the power of the vacuum pump 42 is gradually reduced until the pressure in the hydrogen supply pipeline 10 stabilizes. Then, the flow channel port in the three-way valve 5 connected to the vacuum assembly 4 is closed, and the vacuum pump 42 is turned off or maintained at low speed idling.

[0038] According to an embodiment of the present disclosure, when the current operating condition of the hydrogen power system is the idle condition, the vacuum pump 42 can be controlled to evacuate the hydrogen supply pipeline 10 until the current pressure P of the hydrogen supply pipeline 10 is 实际Below the first safety threshold P4. Due to the sudden drop in hydrogen demand during idling conditions (no power output to the wheels, maintaining minimal operation of the power unit 3), to prevent hydrogen stagnation within the hydrogen supply line 10, the pressure within the hydrogen supply line 10 can be controlled below the first safety threshold P4 to ensure safety. The first safety threshold P4 can be set based on the actual hydrogen demand during idling conditions, but this disclosure is not limited to this. At this point, a first pressure recovery rate v1 of the pressure between the hydrogen storage device 1 and the pressure regulating assembly 2 within the interval t can be obtained, as can a second pressure recovery rate v2 of the pressure between the power unit 3 and the air extraction assembly 4 within the interval t. Specifically, the pressure between the hydrogen storage device 1 and the pressure regulating assembly 2, and the pressure between the power unit 3 and the air extraction assembly 4, can be monitored using the first sensor 61 and the second sensor 62. When either the first pressure recovery rate v1 or the second pressure recovery rate v2 exceeds the rate threshold v, the hydrogen supply line 10 is determined to be leaking and requires repair. Here, when the hydrogen supply line 10 is leaking, the hydrogen storage device 1 can be disconnected from the pressure regulating assembly 2, and the vacuum pump 42 can be controlled to evacuate the hydrogen supply line 10, discharging the remaining hydrogen in the line to the exterior of the vehicle roof. This not only improves the safety of personnel during maintenance, but also allows for timely detection of leaks, reducing the risk of hydrogen leakage during operation. Depending on the location of the first sensor 61 and the second sensor 62, the values ​​of the first pressure recovery rate v1 and the second pressure recovery rate v2 can also be used to further assist in confirming the leak location, thereby narrowing the scope of investigation, improving investigation efficiency, and improving maintenance convenience.

[0039] According to one embodiment of the present disclosure, when the hydrogen power system is shut down, the hydrogen storage device 1 can be first disconnected from the pressure regulating assembly 2, and then the exhaust assembly 4 can be controlled to exhaust the hydrogen supply line 10 until the pressure in the hydrogen supply line 10 is lower than the second safety threshold P5. If the pressure is lower than the second safety threshold P5, the hydrogen supply line 10 can be considered to be empty, thereby avoiding the accumulation of leaked hydrogen caused by the parking of the vehicle and greatly improving the safety of the vehicle during parking. Here, the second safety threshold P5 can be set as needed and can be 0 or a smaller value such as 0.01MPa or 0.02MPa, and this disclosure does not limit this.

[0040] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0042] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A hydrogen power system, characterized in that: It includes a hydrogen supply pipeline, which is connected to a hydrogen storage device, a pressure regulating component and a power component in sequence. The hydrogen supply pipeline is connected to an openable and closable air extraction component, which is connected between the pressure regulating component and the power component. The air extraction component is connected to a gas storage tank, and the gas storage tank can be connected to the hydrogen supply pipeline in an on-off manner.

2. The hydrogen power system according to claim 1, characterized in that: The air extraction assembly includes a vacuum energy storage tank and a vacuum pump connected in sequence, the vacuum energy storage tank is arranged upstream of the vacuum pump, and the vacuum energy storage tank and the vacuum pump are respectively connected to the gas storage tank.

3. The hydrogen power system according to claim 2, characterized in that: The air extraction assembly includes a one-way valve arranged upstream of the vacuum energy storage tank.

4. The hydrogen power system according to claim 1, characterized in that: The pressure regulating assembly includes an overflow valve, a pressure regulating valve and a safety valve which are connected in sequence.

5. A vehicle, characterized in that: A hydrogen power system comprising the hydrogen power system according to any one of claims 1 to 4.

6. A method for controlling a hydrogen power system, characterized in that: Using the hydrogen power system according to any one of claims 1 to 4, the control method includes: Get the current pressure P between the power component and the air extraction component 实际 , and the target pressure P corresponding to the current working condition 目标 , and obtain the difference △P=P 实际 -P 目标 ; If the difference ΔP is greater than the first deviation threshold P1, the exhaust component is controlled to exhaust gas from the hydrogen supply pipeline.

7. The method for controlling a hydrogen power system according to claim 6, wherein: The gas extraction component includes a vacuum energy storage tank and a vacuum pump connected in sequence. In the step of controlling the gas extraction component to extract gas from the hydrogen supply pipeline if the difference ΔP is greater than the first deviation threshold P1, the control method includes: If the difference ΔP is greater than a second deviation threshold P2, controlling the vacuum pump to evacuate the hydrogen supply pipeline; If P1<ΔP≤P2, control the vacuum energy storage tank to evacuate the hydrogen supply pipeline.

8. The method for controlling a hydrogen power system according to claim 7, wherein: The target pressure P corresponding to the current working condition 目标 When the change occurs, the control method includes: Get the target pressure P of the changed working condition 变动后 Compared with the target pressure P of the working condition before the change 变动前 The difference △P 目标 ; In the difference △P 目标 When the pressure is greater than the change threshold value P3, the operating power of the vacuum pump is first increased, and the vacuum pump is controlled to evacuate the hydrogen supply pipeline; The current pressure P in the hydrogen supply line 实际 When the pressure is less than the adjustment threshold P0, the pressure adjustment component is controlled to adjust the intake pressure; The pressure regulating assembly controls the intake pressure to reach the target pressure P of the working condition after the change. 变动后 Then, reduce the operating power of the vacuum pump.

9. The method for controlling a hydrogen power system according to claim 7, wherein: When the current operating condition of the hydrogen power system is an idle condition, the control method includes: Control the vacuum pump to evacuate the hydrogen supply pipeline until the current pressure P of the hydrogen supply pipeline is 实际 Below the first safety threshold P4; Obtaining a first pressure rise rate v1 of the pressure value between the hydrogen storage device and the pressure regulating assembly within an interval time t; Obtaining a second pressure recovery rate v2 of the pressure value between the power component and the air pumping assembly within an interval time t; When the first pressure recovery rate v1 or the second pressure recovery rate v2 is greater than a rate threshold v, it is determined that the hydrogen supply pipeline is in a leaking state.

10. The method for controlling a hydrogen power system according to claim 9, wherein: When the hydrogen supply pipeline is in a leaking state, the control method includes: The hydrogen storage device is controlled to be disconnected from the pressure regulating assembly, and the vacuum pump is controlled to evacuate the hydrogen supply pipeline.

11. The method for controlling a hydrogen power system according to claim 6, wherein: When the hydrogen power system is shut down, the control method includes: Controlling the hydrogen storage device to be disconnected from the pressure regulating assembly; The exhaust assembly is controlled to exhaust gas from the hydrogen supply pipeline until the pressure in the hydrogen supply pipeline is lower than a second safety threshold value P5.

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