Safety monitoring method and equipment of vehicle-mounted hydrogen storage system and storage medium

Abstract

The invention discloses a safety monitoring method and equipment of a vehicle-mounted hydrogen storage system and a storage medium, the vehicle-mounted hydrogen storage system comprises a hydrogen in-pile stop valve, a hydrogen discharge valve, a hydrogen storage bottle, a pressure reducing valve and a hydrogen medium-pressure sensor, and the hydrogen medium-pressure sensor, the pressure reducing valve and the hydrogen in-pile stop valve are sequentially arranged on a pipeline between the hydrogen storage bottle and a fuel cell stack; the method comprises the following steps: acquiring a first opening and closing state of a hydrogen inlet pile stop valve, a second opening and closing state of the hydrogen discharge valve and medium-pressure pressure detected by a hydrogen medium-pressure sensor; determining a fault level threshold according to the first opening and closing state and the second opening and closing state; and determining the fault level of the medium-pressure pressure according to the medium-pressure pressure and the fault level threshold. The fault level is judged by combining the opening and closing states of the hydrogen reactor inlet stop valve and the hydrogen discharge valve, so that the misjudgment and false alarm of the medium-pressure pressure fault under different operation conditions can be effectively avoided, and the accuracy of safety monitoring is improved.

Description

Technical Field

[0001] The present application belongs to the field of vehicle safety technology, and in particular, relates to a safety monitoring method, device and storage medium for a vehicle-mounted hydrogen storage system. Background Art

[0002] Hydrogen energy is regarded as one of the most ideal ultimate energy sources for mankind because of its advantages such as being renewable and zero pollution. In addition, hydrogen energy has been classified by the country from the ranks of hazardous chemicals to the ranks of energy products. At present, the method of using fuel cells to convert hydrogen into electrical energy is widely praised and has been put into practical use in automobiles, ships and fixed power stations, among which the demand for automobiles is particularly huge. The key power source of fuel cell vehicles is that the fuel cell system converts hydrogen in the on-board hydrogen storage system into electrical energy. However, because hydrogen has the characteristics of high energy density, low mass fraction, flammability and explosion, in order to ensure the safe use of hydrogen energy, the on-board hydrogen storage system needs to be safely monitored. Safety monitoring of on-board hydrogen storage systems usually includes temperature monitoring, pressure monitoring and leakage monitoring.

[0003] The hydrogen pressure in the hydrogen storage bottle of the on-board hydrogen storage system is relatively high, and it needs to be reduced to a certain pressure by a pressure reducing valve before it can be used by the fuel cell, otherwise it will damage the internal structure of the fuel cell and form a leak. Therefore, when conducting safety monitoring, it is necessary to monitor the medium pressure after the pressure reducing valve is reduced, which is an important indicator to reflect whether the pressure reducing valve is normal.

[0004] In the related art, the medium pressure is usually monitored by a hydrogen medium pressure sensor, and the monitored medium pressure is compared with a fixed value. When the medium pressure exceeds the fixed value, a fault is reported. This solution is prone to false alarm problems. Summary of the invention

[0005] The embodiments of the present application provide a safety monitoring method, device and storage medium for a vehicle-mounted hydrogen storage system, which can increase the accuracy of safety monitoring of medium pressure and reduce false alarm faults at least to a certain extent.

[0006] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0007] According to a first aspect of an embodiment of the present application, a safety monitoring method for a vehicle-mounted hydrogen storage system is provided, wherein the vehicle-mounted hydrogen storage system comprises a hydrogen inlet shut-off valve, a hydrogen outlet valve, a hydrogen storage bottle, a pressure reducing valve and a hydrogen medium-pressure sensor, wherein the hydrogen medium-pressure sensor, the pressure reducing valve and the hydrogen inlet shut-off valve are sequentially arranged on a pipeline between the hydrogen storage bottle and a fuel cell stack, and the hydrogen outlet valve is arranged at an exhaust port of the fuel cell stack, and the method comprises:

[0008] Acquiring a first opening and closing state of the hydrogen inlet shut-off valve, a second opening and closing state of the hydrogen exhaust valve, and a medium pressure detected by the hydrogen medium pressure sensor;

[0009] Determining a fault level threshold according to the first opening and closing state and the second opening and closing state;

[0010] The fault level of the medium pressure is determined according to the medium pressure and the fault level threshold.

[0011] In some embodiments, determining the fault level threshold according to the first opening and closing state and the second opening and closing state includes:

[0012] When both the first opening and closing state and the second opening and closing state are open, determining at least one first fault level threshold;

[0013] When the first opening and closing state is open and the second opening and closing state is closed, determining at least one second fault level threshold;

[0014] When the first opening and closing state and the second opening and closing state are both closed, at least one third fault level threshold is determined; wherein the first fault level threshold, the second fault level threshold and the third fault level threshold increase in sequence.

[0015] In some embodiments, determining the fault level of the medium pressure according to the medium pressure and the fault level threshold comprises:

[0016] Determining pressure ranges corresponding to different fault levels according to the fault level threshold;

[0017] The fault level corresponding to the pressure range to which the medium pressure belongs is determined as the fault level of the medium pressure.

[0018] In some embodiments, there are multiple hydrogen storage bottles, and the vehicle-mounted hydrogen storage system further includes multiple bottle valves, and the bottle valves are arranged in a one-to-one correspondence with the hydrogen storage bottles. The method further includes:

[0019] obtaining the current of all the bottle valves;

[0020] determining the number of faults of the bottle valve according to the current;

[0021] According to the number of faults, the fault level of the bottle valve is determined.

[0022] In some embodiments, there are multiple hydrogen storage bottles, and the vehicle-mounted hydrogen storage system further includes multiple temperature sensors, and the temperature sensors are arranged in a one-to-one correspondence with the hydrogen storage bottles. The method further includes:

[0023] Acquiring the temperature of the hydrogen storage bottle detected by all the temperature sensors;

[0024] determining two of a maximum temperature, a minimum temperature, and an average temperature based on the temperature;

[0025] The fault level of the temperature of the hydrogen storage bottle is determined according to the difference between the maximum temperature and the minimum temperature, the difference between the maximum temperature and the average temperature, or the difference between the average temperature and the minimum temperature.

[0026] In some embodiments, the safety monitoring method of the vehicle-mounted hydrogen storage system further includes:

[0027] Obtaining all the fault levels of the on-board hydrogen storage system;

[0028] Whether to perform upgrade processing on the same fault level is determined according to the number of the same fault level, the duration and the number of the fault types corresponding to the same fault level.

[0029] In some embodiments, the safety monitoring method of the vehicle-mounted hydrogen storage system further includes:

[0030] Determine whether there is a corresponding level of fault level in order from high to low;

[0031] In the case where there is a corresponding level of fault level, the vehicle is controlled according to a fault handling instruction corresponding to the corresponding level of fault level.

[0032] According to a second aspect of an embodiment of the present application, a safety monitoring device for a vehicle-mounted hydrogen storage system is provided, comprising a processor and a memory, wherein the memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of the method described in any one of the first aspects above are implemented.

[0033] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor is prompted to implement the steps of the method described in any one of the first aspects above.

[0034] According to a fourth aspect of an embodiment of the present application, a computer program product is provided, including a computer program. When the computer program product is executed by a processor, it prompts the processor to implement the steps of the method described in any one of the first aspects above.

[0035] In the present application, the first opening and closing state of the hydrogen inlet shutoff valve, the second opening and closing state of the hydrogen discharge valve, and the medium pressure detected by the hydrogen medium pressure sensor are obtained; the fault level threshold is determined according to the first opening and closing state and the second opening and closing state; the fault level of the medium pressure is determined according to the medium pressure and the fault level threshold. Among them, by combining the opening and closing states of the hydrogen inlet shutoff valve and the hydrogen discharge valve to judge the fault level, it can effectively avoid misjudgment and false alarm of medium pressure faults under different operating conditions, and improve the accuracy of safety monitoring.

[0036] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0038] Figure 1 A schematic structural diagram of a vehicle-mounted hydrogen storage system in one embodiment is shown;

[0039] Figure 2 A schematic diagram of a process flow of a safety monitoring method for a vehicle-mounted hydrogen storage system in one embodiment is shown;

[0040] Figure 3 A schematic flow chart of a safety monitoring method for a vehicle-mounted hydrogen storage system in another embodiment is shown;

[0041] Figure 4 A block diagram of a safety monitoring device for a vehicle-mounted hydrogen storage system in one embodiment is shown;

[0042] Figure 5 A schematic structural diagram of a safety monitoring device for a vehicle-mounted hydrogen storage system in one embodiment is shown.

[0043] Description of Figure Numbers

[0044] 1. Hydrogen storage bottle; 2. Temperature sensor; 3. Bottle valve; 4. Hydrogen high-pressure sensor; 5. Hydrogen medium-pressure sensor; 6. Pressure reducing valve; 7. Manual switch valve; 8. Hydrogen inlet shut-off valve; 9. Hydrogen return assembly; 10. Hydrogen discharge valve; 11. Fuel cell stack; 12. Hydrogen filling port. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0047] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0048] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0049] It should also be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0050] In order to make those skilled in the art better understand the present application, firstly, Figure 1 The vehicle-mounted hydrogen storage system involved in this application is briefly described.

[0051] Figure 1 FIG. 2 shows a schematic diagram of the structure of a vehicle-mounted hydrogen storage system in one embodiment. Figure 1As shown, the on-board hydrogen storage system may include a hydrogen inlet stop valve 8, a hydrogen discharge valve 10, a hydrogen storage bottle 1, a pressure reducing valve 6, a hydrogen medium pressure sensor 5, a bottle valve 3, a hydrogen high pressure sensor 4, a temperature sensor 2, a manual switch valve 7, a hydrogen return assembly 9 and a hydrogen filling port 12, wherein the hydrogen medium pressure sensor 5, the pressure reducing valve 6 and the hydrogen inlet stop valve 8 are sequentially arranged on the pipeline between the hydrogen storage bottle 1 and the fuel cell stack 11, and the hydrogen discharge valve 10 is arranged at the exhaust port of the fuel cell stack 11. During normal operation, the bottle valve 3 and the pressure reducing valve 6 are first opened in sequence, and after the medium pressure is stable, the hydrogen inlet stop valve 8 is opened to supply hydrogen to the fuel cell stack 11, and the hydrogen return assembly 9 sends the hydrogen that has not been completely consumed back to the fuel cell stack 11 for consumption reaction. Because the fuel cell stack 11 reacts to generate water, the hydrogen discharge valve 10 will be opened and closed at a certain frequency to remove excess water. During the whole process of normal operation of the on-board hydrogen storage system, it is necessary to monitor the values ​​of each sensor to determine whether a fault occurs. During hydrogenation, the hydrogenation gun is inserted into the hydrogenation port 12. During the hydrogenation process, the temperature in the hydrogen storage bottle 1 needs to be monitored to prevent the temperature in the hydrogen storage bottle 1 from being too high due to the Joule-Thomson effect. When replacing the gas in the hydrogen storage bottle 1, the bottle valve 3, the pressure reducing valve 6 and the manual switch valve 7 are opened in sequence to exhaust the gas in the hydrogen storage bottle 1.

[0052] When the on-board hydrogen storage system is operating normally and refueling, the on-board hydrogen storage system needs to be safety monitored. This safety monitoring may include medium pressure monitoring, bottle valve monitoring, temperature monitoring in the hydrogen storage bottle, etc. In the existing hydrogen safety monitoring scheme, the fault level is judged only by whether the value fed back by a single sensor exceeds a fixed value, which is prone to misjudgment. This application is based on the architecture of the on-board hydrogen storage system, taking into account the complementary energy efficiency between multiple sensors and the classification judgment under different conditions, so that hydrogen safety monitoring is more reasonable and effective.

[0053] For monitoring of medium pressure, the judgment threshold of fault level in the related art is fixed, and the influence of hydrogen inlet shutoff valve and hydrogen discharge valve on medium pressure is not considered. The judgment threshold is not differentiated according to whether the hydrogen inlet shutoff valve and hydrogen discharge valve are open, which is prone to misjudgment and false alarm of faults. The embodiment of the present application determines multiple different fault level thresholds according to the opening and closing states of the hydrogen inlet shutoff valve and hydrogen discharge valve, and then judges the fault level of medium pressure more precisely, which can effectively avoid misjudgment and false alarm of medium pressure faults under different operating conditions, and improve the accuracy of safety monitoring.

[0054] Figure 2 FIG. 1 is a flow chart of a safety monitoring method for a vehicle-mounted hydrogen storage system in one embodiment. Figure 2 As shown, a safety monitoring method for a vehicle-mounted hydrogen storage system is provided, which may include the following steps 201 to 203.

[0055] In step 201, a first opening and closing state of a hydrogen inlet shut-off valve, a second opening and closing state of a hydrogen outlet valve, and a medium pressure detected by a hydrogen medium pressure sensor are obtained.

[0056] It can be understood that the first opening and closing state includes opening and closing. When the hydrogen inlet cut-off valve is opened, it indicates that the fuel cell stack begins to consume hydrogen. The second opening and closing state also includes opening and closing. When the hydrogen exhaust valve is opened, hydrogen will be discharged from the vehicle-mounted hydrogen storage system.

[0057] In step 202, a fault level threshold is determined according to the first opening and closing state and the second opening and closing state.

[0058] It can be understood that, according to the specific circumstances of the first opening and closing state and the second opening and closing state, a plurality of fault level thresholds can be determined to avoid misjudgment of medium pressure faults under different operating conditions.

[0059] In some embodiments, when the first opening and closing state and the second opening and closing state are both open, at least one first fault level threshold is determined; when the first opening and closing state is open and the second opening and closing state is closed, at least one second fault level threshold is determined; when the first opening and closing state and the second opening and closing state are both closed, at least one third fault level threshold is determined; wherein the first fault level threshold, the second fault level threshold and the third fault level threshold increase sequentially.

[0060] It should be noted that when both the hydrogen inlet shut-off valve and the hydrogen exhaust valve are open, the medium pressure in the on-board hydrogen storage system should be the smallest. When the hydrogen inlet shut-off valve is open but the hydrogen exhaust valve is closed, the medium pressure in the on-board hydrogen storage system is in the middle. When both the hydrogen inlet shut-off valve and the hydrogen exhaust valve are closed, the medium pressure in the on-board hydrogen storage system is the largest because the fuel cell stack does not consume hydrogen.

[0061] Based on this principle, when both the hydrogen inlet shut-off valve and the hydrogen exhaust valve are open, the first fault level threshold should be the smallest; when the hydrogen inlet shut-off valve is open but the hydrogen exhaust valve is closed, the second fault level threshold should be in the middle; when both the hydrogen inlet shut-off valve and the hydrogen exhaust valve are closed, the third fault level threshold is the largest.

[0062] The number of the first fault level threshold, the second fault level threshold and the third fault level threshold can be one or more. When the number of the first fault level threshold, the second fault level threshold and the third fault level threshold is more than one, the fault level can be divided more finely.

[0063] In step 203, the fault level of the medium pressure is determined according to the medium pressure and the fault level threshold.

[0064] In some embodiments, the pressure ranges corresponding to different fault levels can be determined according to the fault level threshold; the fault level corresponding to the pressure range to which the medium pressure belongs is determined as the fault level of the medium pressure.

[0065] It can be understood that, taking the fault levels as level one, level two and level three, and medium pressure being too low and too high as level three, lower and higher as level two, and low and high as level one as an example, when the first opening and closing state and the second opening and closing state are both open, multiple first fault level thresholds that increase in sequence can be determined: A0, A1, A2, A3, A4, A5 and A6, constituting the pressure ranges A0-A1, A1-A2, A2-A3, A3-A4, A4-A5, A5-A6, when the pressure range to which the medium pressure belongs is A0-A1 and A5-A6, the fault level of the medium pressure is determined to be level three; when the pressure range to which the medium pressure belongs is A1-A2 and A4-A5, the fault level of the medium pressure is determined to be level two; when the pressure range to which the medium pressure belongs is A2-A3 and A3-A4, the fault level of the medium pressure is determined to be level one.

[0066] When the first opening and closing state is open and the second opening and closing state is closed, and when both the first opening and closing state and the second opening and closing state are closed, multiple successively increasing second fault level thresholds and third fault level thresholds can also be determined to form multiple pressure ranges, and based on the pressure range to which the medium pressure belongs, determine whether the fault level of the medium pressure is a first-level fault, a second-level fault, or a third-level fault.

[0067] In the medium pressure monitoring in safety monitoring, the embodiment of the present application obtains the first opening and closing state of the hydrogen inlet shutoff valve, the second opening and closing state of the hydrogen exhaust valve, and the medium pressure detected by the hydrogen medium pressure sensor; determines the fault level threshold according to the first opening and closing state and the second opening and closing state; determines the fault level of the medium pressure according to the medium pressure and the fault level threshold. Among them, by combining the opening and closing states of the hydrogen inlet shutoff valve and the hydrogen exhaust valve to judge the fault level, it can effectively avoid misjudgment and false alarm of medium pressure faults under different operating conditions, thereby improving the accuracy of safety monitoring.

[0068] Return to reference Figure 1 In some embodiments, there are multiple hydrogen storage bottles, and the on-board hydrogen storage system also includes multiple bottle valves, which are arranged one-to-one with the hydrogen storage bottles. The safety monitoring method of the on-board hydrogen storage system may also include the following steps: obtaining the current of all bottle valves; determining the number of bottle valve faults based on the current; and determining the fault level of the bottle valve based on the number of faults.

[0069] It can be understood that when the current of the bottle valve is greater than the preset value, the bottle valve can be determined to be open, and when the current is zero, the bottle valve can be determined to be short-circuited. The total number of open bottle valves and short-circuited bottle valves can be determined as the number of bottle valve failures. Only when the number of bottle valve failures is the total number of bottle valves, the fault level of the bottle valve is determined to be a secondary fault. When the number of faults is less than the total number, the fault level is determined to be a primary fault.

[0070] It should be noted that the cylinder valve may have an open circuit or short circuit fault. At this time, the cylinder valve cannot be opened and cannot provide hydrogen to the fuel-electric system. Therefore, it is necessary to monitor whether the cylinder valve is open or short-circuited. In the current hydrogen safety monitoring, when a single cylinder valve is open or short-circuited, a high-level fault is reported and the fuel-electric system is prohibited from operating. This will seriously affect the vehicle's mileage and easily cause the vehicle to break down halfway.

[0071] In the embodiment of the present application, in the monitoring of bottle valve open circuit or short circuit in safety monitoring, the number of bottle valve failures is taken into consideration instead of directly defining them as the same fault level, which can effectively reduce the problem of vehicles breaking down on the road.

[0072] Return to reference Figure 1 In some embodiments, there are multiple hydrogen storage bottles, and the on-board hydrogen storage system also includes multiple temperature sensors, which are arranged one-to-one with the hydrogen storage bottles. The safety monitoring method of the on-board hydrogen storage system may also include the following steps: obtaining the temperatures of the hydrogen storage bottles detected by all temperature sensors; determining two of the highest temperature, the lowest temperature and the average temperature based on the temperature; determining the fault level of the temperature of the hydrogen storage bottle based on the difference between the highest temperature and the lowest temperature, the difference between the highest temperature and the average temperature, or the difference between the average temperature and the lowest temperature.

[0073] During the implementation process, when the difference is small, the fault level of the temperature of the hydrogen storage bottle is determined to be a level one fault, when the difference is in the middle, the fault level of the temperature of the hydrogen storage bottle is determined to be a level two fault, and when the difference is large, the fault level of the temperature of the hydrogen storage bottle is determined to be a level three fault.

[0074] It should be noted that hydrogen is flammable and explosive. The on-board hydrogen storage system usually has multiple hydrogen storage bottles. The temperature in each hydrogen storage bottle needs to be monitored during the entire process of hydrogenation and use. In the related technology, only the temperature in each hydrogen storage bottle is detected, and a fault warning is issued when the temperature exceeds or falls below the preset value. The complementary effect between the temperature sensors is not considered. When a temperature sensor fails or drifts (i.e., is inaccurate), the monitored temperature will fail or the value will be unreasonable, resulting in misjudgment and false alarm of the fault.

[0075] In the embodiment of the present application, in terms of temperature monitoring inside the hydrogen storage bottle in safety monitoring, the numerical values ​​of various temperature sensors are compared and analyzed, thereby eliminating the problem of misjudgment caused by temperature sensor failure or temperature drift.

[0076] In some embodiments, the safety monitoring method of the vehicle-mounted hydrogen storage system may further include the following steps: obtaining all fault levels of the vehicle-mounted hydrogen storage system; determining whether to upgrade the same fault level based on the number of the same fault level, the duration and number of fault types corresponding to the same fault level.

[0077] The current safety monitoring scheme handles primary faults with warnings and does not take other actions. When the fault is restored, the warning is automatically eliminated. It does not take into account the number of primary faults occurring simultaneously, the duration of the same type of fault, and the number of repeated occurrences. This will greatly reduce the life of the fuel cell and pose a safety hazard, which will cause great losses.

[0078] In terms of fault escalation in safety monitoring, the embodiments of the present application take into account the number of fault levels at the same level, the duration and number of fault types corresponding to the same level, thereby reducing system life degradation and eliminating potential higher-level faults.

[0079] In some embodiments, the safety monitoring method of the on-board hydrogen storage system may further include the following steps: judging in order from high to low whether there is a fault level of the corresponding level; if there is a fault level of the corresponding level, controlling the vehicle according to the fault handling instructions corresponding to the fault level of the corresponding level.

[0080] It should be noted that when fault reporting and post-fault action execution are being performed, first determine whether a level 4 fault has occurred (taking level 4 fault as the highest level fault for example). If a level 4 fault has occurred, the fault code of the first fault will be locked and all level 4 fault codes will be played in a loop, the fuel-electric system and the entire vehicle will stop suddenly and high voltage will not be allowed. If a level 4 fault has not occurred, determine whether a level 3 fault has occurred. If a level 3 fault has occurred, the fault code of the first fault will be locked and all level 3 fault codes will be played in a loop, the fuel-electric system will stop suddenly, the entire vehicle can be powered on high voltage, and it can run on pure electricity. If no level 4 or level 3 fault occurs, the system will continue to determine whether a level 2 fault occurs. If a level 2 fault occurs, the fault code of the first fault will be locked and all level 2 fault codes will be played in a loop. The fuel-electric system will be shut down for purging. If the purging is not completed within the specified time, the fuel-electric system will be emergency stopped, and the vehicle can be powered on high voltage and can be driven on pure electricity. If no level 4, level 3 or level 2 fault occurs, the system will determine whether a level 1 fault occurs. If a level 1 fault occurs, the fault code of the first fault will be locked and all level 1 fault codes will be played in a loop. The instrument will flash as a reminder.

[0081] Figure 3 FIG. 2 is a flow chart showing a safety monitoring method for a vehicle-mounted hydrogen storage system in another embodiment. Figure 3 As shown, the safety monitoring method of the vehicle-mounted hydrogen storage system may include the following steps:

[0082] Step 301, determining a fault level threshold according to a first opening and closing state of a hydrogen inlet shut-off valve and a second opening and closing state of a hydrogen outlet valve, and determining a fault level of a medium pressure according to a medium pressure detected by a hydrogen medium pressure sensor and the fault level threshold;

[0083] Step 302, determining the number of bottle valve failures according to the currents of all bottle valves, and determining the level of the bottle valve failures according to the number of failures;

[0084] Step 303, based on the temperature of the hydrogen storage bottle detected by all temperature sensors, determine two of the maximum temperature, the minimum temperature and the average temperature, and determine the fault level of the temperature of the hydrogen storage bottle based on the difference between the maximum temperature and the minimum temperature, the difference between the maximum temperature and the average temperature, or the difference between the average temperature and the minimum temperature.

[0085] The embodiment of the present application improves the defects of the existing solutions in bottle valve monitoring, temperature monitoring of hydrogen storage bottles, and medium pressure monitoring through the above-mentioned safety monitoring method of the on-board hydrogen storage system, thereby improving the rationality and accuracy of monitoring.

[0086] The following describes an embodiment of the device of the present application, which can be used to execute the safety monitoring method of the vehicle-mounted hydrogen storage system in the above embodiment of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the safety monitoring method of the vehicle-mounted hydrogen storage system in the above embodiment of the present application.

[0087] Figure 4 The block diagram of a safety monitoring device for a vehicle-mounted hydrogen storage system in one embodiment is shown. The vehicle-mounted hydrogen storage system includes a hydrogen inlet shutoff valve, a hydrogen outlet valve, a hydrogen storage bottle, a pressure reducing valve, and a hydrogen medium pressure sensor. The hydrogen medium pressure sensor, the pressure reducing valve, and the hydrogen inlet shutoff valve are sequentially arranged on the pipeline between the hydrogen storage bottle and the fuel cell stack. The hydrogen outlet valve is arranged at the exhaust port of the fuel cell stack. Figure 4 As shown, the safety monitoring device of the vehicle-mounted hydrogen storage system of the embodiment of the present application includes: a data acquisition module 401, which is used to obtain a first opening and closing state of the hydrogen inlet shut-off valve, a second opening and closing state of the hydrogen exhaust valve, and a medium pressure detected by the hydrogen medium pressure sensor; a threshold determination module 402, which is used to determine a fault level threshold according to the first opening and closing state and the second opening and closing state; and a level determination module 403, which is used to determine the fault level of the medium pressure according to the medium pressure and the fault level threshold.

[0088] In some embodiments of the present application, based on the aforementioned scheme, the threshold determination module 402 is also used to determine at least one first fault level threshold when the first opening and closing state and the second opening and closing state are both open; determine at least one second fault level threshold when the first opening and closing state is open and the second opening and closing state is closed; determine at least one third fault level threshold when the first opening and closing state and the second opening and closing state are both closed; wherein the first fault level threshold, the second fault level threshold and the third fault level threshold increase sequentially.

[0089] In some embodiments of the present application, based on the aforementioned scheme, the level determination module 403 is also used to determine the pressure ranges corresponding to different fault levels according to the fault level threshold; and determine the fault level corresponding to the pressure range to which the medium pressure belongs as the fault level of the medium pressure.

[0090] In some embodiments of the present application, based on the aforementioned scheme, there are multiple hydrogen storage bottles, and the on-board hydrogen storage system also includes multiple bottle valves, which are arranged one-to-one corresponding to the hydrogen storage bottles. The level determination module 403 is also used to obtain the current of all bottle valves; determine the number of bottle valve faults based on the current; and determine the fault level of the bottle valve based on the number of faults.

[0091] In some embodiments of the present application, based on the aforementioned scheme, there are multiple hydrogen storage bottles, and the on-board hydrogen storage system also includes multiple temperature sensors, and the temperature sensors are arranged in a one-to-one correspondence with the hydrogen storage bottles. The level determination module 403 is also used to obtain the temperature of the hydrogen storage bottles detected by all temperature sensors; determine two of the highest temperature, the lowest temperature and the average temperature based on the temperature; determine the fault level of the temperature of the hydrogen storage bottle based on the difference between the highest temperature and the lowest temperature, the difference between the highest temperature and the average temperature, or the difference between the average temperature and the lowest temperature.

[0092] In some embodiments of the present application, based on the aforementioned scheme, the level determination module 403 is also used to obtain all fault levels of the on-board hydrogen storage system; and determine whether to upgrade the same fault level according to the number of the same fault level, the duration and number of fault types corresponding to the same fault level.

[0093] In some embodiments of the present application, based on the aforementioned scheme, the device also includes a fault handling module (not shown in the figure), which is used to determine whether there is a corresponding level of fault level in order from high to low; when there is a corresponding level of fault level, the vehicle is controlled according to the fault handling instructions corresponding to the corresponding level of fault level.

[0094] Based on the same inventive concept, the present application embodiment also provides a safety monitoring device for a vehicle-mounted hydrogen storage system, referring to Figure 5, shows a schematic diagram of the structure of the safety monitoring device of the vehicle-mounted hydrogen storage system in an embodiment of the present application, wherein the safety monitoring device of the vehicle-mounted hydrogen storage system includes one or more memories 504, one or more processors 502, and at least one computer program (computer program instruction) stored in the memory 504 and executable on the processor 502, and the processor 502 implements the method described above when executing the computer program.

[0095] Among them, Figure 5 In the embodiment of the present invention, a bus architecture (represented by bus 500) is shown, which may include any number of interconnected buses and bridges, and bus 500 links various circuits including one or more processors represented by processor 502 and memory represented by memory 504. Bus 500 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. Bus interface 505 provides an interface between bus 500 and receiver 501 and transmitter 503. Receiver 501 and transmitter 503 may be the same element, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 502 is responsible for managing bus 500 and general processing, while memory 504 may be used to store data used by processor 502 when performing operations.

[0096] Based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium, in which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor is prompted to implement the steps of the method as described above.

[0097] Based on the same inventive concept, an embodiment of the present application provides a computer program product, including a computer program. When the computer program product is executed by a processor, it prompts the processor to implement the steps of the method as described above.

[0098] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0099] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0100] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0101] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly or all or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store computer program instructions.

[0102] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A safety monitoring method for a vehicle-mounted hydrogen storage system, characterized in that: The vehicle-mounted hydrogen storage system comprises a hydrogen inlet shutoff valve, a hydrogen discharge valve, a hydrogen storage bottle, a pressure reducing valve and a hydrogen medium pressure sensor, wherein the hydrogen medium pressure sensor, the pressure reducing valve and the hydrogen inlet shutoff valve are sequentially arranged on a pipeline between the hydrogen storage bottle and the fuel cell stack, and the hydrogen discharge valve is arranged at an exhaust port of the fuel cell stack. The method comprises: Acquiring a first opening and closing state of the hydrogen inlet shut-off valve, a second opening and closing state of the hydrogen exhaust valve, and a medium pressure detected by the hydrogen medium pressure sensor; Determining a fault level threshold according to the first opening and closing state and the second opening and closing state; The fault level of the medium pressure is determined according to the medium pressure and the fault level threshold.

2. The safety monitoring method of the vehicle-mounted hydrogen storage system according to claim 1, characterized in that: The determining of a fault level threshold according to the first opening and closing state and the second opening and closing state includes: When both the first opening and closing state and the second opening and closing state are open, determining at least one first fault level threshold; When the first opening and closing state is open and the second opening and closing state is closed, determining at least one second fault level threshold; When the first opening and closing state and the second opening and closing state are both closed, at least one third fault level threshold is determined; wherein the first fault level threshold, the second fault level threshold and the third fault level threshold increase in sequence.

3. The safety monitoring method of the vehicle-mounted hydrogen storage system according to claim 2, characterized in that: The determining the fault level of the medium pressure according to the medium pressure and the fault level threshold comprises: Determining pressure ranges corresponding to different fault levels according to the fault level threshold; The fault level corresponding to the pressure range to which the medium pressure belongs is determined as the fault level of the medium pressure.

4. The safety monitoring method for a vehicle-mounted hydrogen storage system according to any one of claims 1 to 3, characterized in that: There are multiple hydrogen storage bottles, and the vehicle-mounted hydrogen storage system further includes multiple bottle valves, and the bottle valves are arranged in a one-to-one correspondence with the hydrogen storage bottles. The method further includes: obtaining the current of all the bottle valves; determining the number of faults of the bottle valve according to the current; According to the number of faults, the fault level of the bottle valve is determined.

5. The safety monitoring method for a vehicle-mounted hydrogen storage system according to any one of claims 1 to 3, characterized in that: There are multiple hydrogen storage bottles, and the vehicle-mounted hydrogen storage system further includes multiple temperature sensors, and the temperature sensors are arranged in a one-to-one correspondence with the hydrogen storage bottles. The method further includes: Acquiring the temperature of the hydrogen storage bottle detected by all the temperature sensors; determining two of a maximum temperature, a minimum temperature, and an average temperature based on the temperature; The fault level of the temperature of the hydrogen storage bottle is determined according to the difference between the maximum temperature and the minimum temperature, the difference between the maximum temperature and the average temperature, or the difference between the average temperature and the minimum temperature.

6. The safety monitoring method for a vehicle-mounted hydrogen storage system according to any one of claims 1 to 3, characterized in that: Also includes: Obtaining all the fault levels of the on-board hydrogen storage system; Whether to perform upgrade processing on the same fault level is determined according to the number of the same fault level, the duration and the number of the fault types corresponding to the same fault level.

7. The safety monitoring method of the vehicle-mounted hydrogen storage system according to claim 6, characterized in that: Also includes: Determine whether there is a corresponding level of fault level in order from high to low; In the case where there is a corresponding level of fault level, the vehicle is controlled according to a fault handling instruction corresponding to the corresponding level of fault level.

8. A safety monitoring device for a vehicle-mounted hydrogen storage system, comprising a processor and a memory, characterized in that: The memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of the method according to any one of claims 1 to 7 are implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, which, when executed by a processor, prompt the processor to implement the steps of the method according to any one of claims 1 to 7.

10. A computer program product, comprising a computer program, characterized in that When the computer program product is executed by a processor, the processor is prompted to implement the steps of the method according to any one of claims 1 to 7.

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