Train hydrogen storage system valve drive control method and device and medium

Abstract

The invention discloses a train hydrogen storage system valve drive control method and device and a medium, and the method comprises the steps: in a starting stage, a control valve drive circuit outputs PWM drive current to a bottle opening valve of each hydrogen bottle in a hydrogen storage system so as to control each bottle opening valve to be opened; in the output maintaining stage, the duty ratio of the PWM driving current output by the valve driving circuit is adjusted; in the control process of the starting stage and the output maintaining stage, a driving current feedback value is detected in real time, the fault state of the valve coil is judged according to the driving current feedback value detected in real time, and the temperature rise value of the coil is calculated; and calculating a health state prediction value of the hydrogen storage system according to the driving current feedback values of the starting stage and the output maintenance stage and the temperature rise value so as to predict and evaluate the health state of the hydrogen storage system. The method has the advantages of simple implementation method, low cost, high control efficiency, fault monitoring function, safety, reliability and the like.

Description

Technical Field

[0001] This invention relates to the field of hydrogen storage system control technology for hydrogen-powered trains, and in particular to a valve drive control method, device, and medium for a train hydrogen storage system. Background Technology

[0002] The hydrogen storage system is responsible for storing and supplying hydrogen, serving as the direct energy source for hydrogen-powered trains. As demands for train range and operating speed increase, the primary method is to increase the hydrogen capacity of the storage system by using high-pressure (70 MPa) hydrogen cylinders and increasing the number of cylinders. However, hydrogen is a colorless, flammable, and explosive gas, and the increased pressure and capacity necessitate increasingly stringent safety requirements for the control and monitoring of the system's components. To prevent the risk of hydrogen accumulation, current hydrogen-powered trains typically install their storage systems on the roof, using a porous design with a protective cover. However, this exposes the system's components to the air, making them susceptible to wind, rain, dust, and other contaminants. Furthermore, if a malfunction occurs during operation, timely repairs are difficult, requiring the train to be returned to a depot for maintenance. Furthermore, the key control components of the hydrogen storage system, such as the bottle neck valve and the solenoid valve, are mechanically driven by open-loop coils. When a valve malfunctions, the system cannot detect the fault in time. If a bottle neck valve cannot open properly or closes due to a malfunction, the pressure difference between the hydrogen cylinders will continue to increase, creating a safety hazard. At this time, the calculated remaining hydrogen capacity will deviate from the actual usable hydrogen capacity. The more bottle neck valves malfunction, the greater this deviation will be, which will seriously affect the normal operation of the train.

[0003] Chinese patent application CN113540532A discloses a method for diagnosing faulty valves in a fuel cell hydrogen system. This method divides the pressure increase process of the hydrogen supply pipeline into multiple stages, opening the hydrogen cylinder with the lowest stored hydrogen pressure at each stage. Pressure sensors are placed in each hydrogen cylinder, and after opening the valve of one cylinder sequentially at each stage, the valve is then closed to diagnose the faulty valve. However, this diagnostic method is not only complex and inefficient, making real-time fault monitoring difficult, but it can only diagnose faults in a single valve and cannot predict the overall health status of the hydrogen storage system. Summary of the Invention

[0004] The technical problem to be solved by this invention is: in view of the technical problems existing in the prior art, this invention provides a valve drive control method, device and medium for a train hydrogen storage system that is simple to implement, low in cost, highly efficient in control, has fault monitoring function and is safe and reliable. It can realize real-time monitoring of the fault status of the cylinder valve of the train hydrogen storage system, and can also predict the overall health status of the hydrogen storage system, so as to ensure the overall safe and reliable operation of the system.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0006] A valve actuation control method for a train hydrogen storage system, the hydrogen storage system comprising multiple hydrogen cylinders, each of which is equipped with a corresponding cylinder valve, the method comprising the following steps:

[0007] During the startup phase, the control valve drive circuit outputs PWM (Pulse Width Modulation) drive current to the valve opening of each hydrogen cylinder in the hydrogen storage system to control the opening of each valve. During the startup phase and the output maintenance phase, the duty cycle of the PWM drive current output by the valve drive circuit is adjusted.

[0008] During the control process of the startup phase and the output maintenance phase, the drive current feedback value is detected in real time, and the fault status of the corresponding valve coil is determined and the temperature rise value of the corresponding valve coil is calculated based on the real-time detected drive current feedback value.

[0009] The health status of the hydrogen storage system is predicted based on the drive current feedback values ​​during the startup and output maintenance phases, as well as the temperature rise of the coil.

[0010] Furthermore, determining the fault state of the valve coil based on the real-time detected drive current feedback value includes:

[0011] During the startup phase, if the detected drive current feedback value is less than the preset minimum startup current, it is determined that the valve coil has a breakage fault; if the detected drive current feedback value is greater than a specified multiple of the rated startup current, it is determined that the valve coil has a short circuit fault.

[0012] During the output sustaining phase, if the detected drive current feedback value is less than the preset minimum sustaining current, the valve coil is determined to have a breakage fault; if the detected drive current feedback value is greater than a specified multiple of the rated sustaining current, the valve coil is determined to have a short circuit fault.

[0013] Furthermore, after determining the fault state of the valve coil based on the real-time detected drive current feedback value, the method further includes determining whether an abnormality warning needs to be issued based on the real-time detected drive current feedback value, wherein if I is satisfied during the startup phase... feed-on >I on +ΔI on Or I feed-on <I on -ΔI on During the output maintenance phase, I is satisfied. feed-hold >I hold +ΔI hold Or I feed-hold <I hold -ΔI holdIf so, it is determined that an abnormality warning needs to be issued, where I feed-on I is the drive current feedback value detected during the startup phase. on The rated starting current, ΔI on The normal current variation range during the startup phase, I hold For the rated holding current, ΔI hold To maintain the normal range of current variation during the phase.

[0014] Furthermore, the calculation expression for the temperature rise of the corresponding valve coil is as follows:

[0015]

[0016] Among them, T coil T represents the temperature rise of the valve coil, U represents the measured value of the drive voltage, and T represents the temperature rise of the valve coil. e At an ambient temperature of 20℃, T k R is the reciprocal of the temperature coefficient of resistance of the coil material at 0℃. e This is the resistance value of the coil at an ambient temperature of 20℃.

[0017] Furthermore, it also includes calculating the total equivalent lifetime already lost based on the calculated temperature rise of the valve coil, as expressed by the following formula:

[0018]

[0019] Among them, L cy This represents the total equivalent lifetime that has been lost so far, HIC is the material half-life, and T is the total equivalent lifetime that has been lost. coil-i t represents the i-th operating temperature of the valve coil during actual operation. i For operating temperature at T coil-i The working time is M, where M represents the number of all temperature values ​​during the actual operation of the coil.

[0020] Furthermore, the step of predicting the health status of the hydrogen storage system based on the drive current feedback values ​​of the startup phase and the output maintenance phase, as well as the temperature rise value of the coil, includes: calculating the abnormality level value of the startup phase and the abnormality level value of the output maintenance phase based on the drive current feedback values ​​of each valve in the startup phase and the output maintenance phase, respectively; weighting the abnormality level value and the abnormality level value of the output maintenance phase with the equivalent life index to obtain the predicted health status value corresponding to each valve for assessing the health status; wherein the equivalent life index is the ratio between all the equivalent life values ​​that have been lost so far and the time when the total equivalent life lost due to temperature aging equals the temperature index of the insulating material.

[0021] Furthermore, the predicted health status value corresponding to each bottle valve is calculated according to the following formula:

[0022]

[0023] w on =|I feed-on -I on |

[0024] w hold =|I feed-hold -I hold |

[0025] Among them, W j β represents the predicted health status value of the j-th valve. j Let θ be the abnormal early warning constraint factor for the output maintenance phase of the j-th bottle valve. j Let α be the constraint factor for the equivalent life of the j-th bottle neck valve. j w is the constraint factor for abnormal early warning during the startup phase of the j-th bottle valve. on w is the abnormal warning value during the startup phase. hold To output abnormal early warning values ​​during the maintenance phase, I feed-on I is the drive current feedback value detected during the startup phase. on For the rated starting current, I feed-hold I is the drive current feedback value detected during the startup phase. hold This is the rated holding current;

[0026] The predicted health status of the entire hydrogen storage system is:

[0027]

[0028] Where N represents the number of bottle neck valves.

[0029] Furthermore, a batch-by-batch, time-based start-up control method is adopted, first controlling the start-up of a batch of bottle valves and entering the output maintenance stage, and then starting the next batch of bottle valves.

[0030] A valve drive control module for a train hydrogen storage system includes a processor and a memory, wherein the memory stores a computer program and the processor executes the computer program to perform the method described above.

[0031] A valve actuation device for a train hydrogen storage system includes a valve actuation control module and multiple valve actuation modules. Each valve actuation module is connected to the valve actuation control module, and each valve actuation module is connected to a valve at the mouth of a hydrogen cylinder. The valve actuation control module performs valve actuation control as described above.

[0032] Furthermore, the valve driving module includes a current acquisition circuit, a PWM driving circuit, and a freewheeling circuit connected in sequence, with the freewheeling circuit located at both ends of the bottle valve.

[0033] Furthermore, the input terminal of the current acquisition circuit is also equipped with a master drive switch. By controlling the master drive switch to open and the PWM drive circuit to output normally, the opening of the corresponding bottle valve can be controlled.

[0034] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described above.

[0035] Compared with the prior art, the advantages of this invention are as follows: This invention provides an adjustable duty cycle PWM drive current to the cylinder valves of each hydrogen cylinder through a control valve drive circuit. Based on PID closed-loop control, it realizes the opening and output maintenance of each cylinder valve. At the same time, during the control process of the start-up and output maintenance phases, the drive current feedback value is detected in real time. The fault status of each cylinder valve is judged and the temperature rise value of each cylinder valve is calculated using the drive current feedback value and the temperature rise value. Then, the overall health status of the hydrogen storage system is predicted using the drive current feedback value and the temperature rise value of each cylinder valve. This not only effectively realizes the cylinder valve drive, but also realizes the monitoring of the fault status of each cylinder valve and the prediction of the overall health status of the hydrogen storage system through the cylinder valve drive process. This allows for timely and accurate detection of faults when cylinder valves fail, and also allows for early prediction of the overall health status of the hydrogen storage system, thereby facilitating early fault warning or execution of corresponding protective actions. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure and principle of the hydrogen storage system in this embodiment.

[0037] Figure 2 This is a schematic diagram of the structural principle of the valve drive module in this embodiment.

[0038] Figure 3 This is a schematic diagram illustrating the implementation process of the valve drive control method for the train hydrogen storage system in this embodiment. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0040] Traditional hydrogen storage system controllers typically use a single DO (Digital Output) to drive a relay, which then controls the energization of multiple cylinder valves via contacts. Without direct feedback signals, they cannot individually sense the operating status of each hydrogen cylinder. Therefore, if a valve fails to open properly or closes due to a malfunction, the pressure difference between the cylinders will continuously increase, leading to safety hazards and affecting the normal operation of the train. Real-time online fault monitoring of the hydrogen storage system, predicting its health status during operation, and enabling fault warnings and lifespan assessments would significantly improve the intelligence and ease of maintenance of trains.

[0041] The train hydrogen storage system used in this embodiment is as follows: Figure 1 As shown, each hydrogen storage unit is equipped with N or more (>10) hydrogen cylinders. Each hydrogen cylinder is equipped with a cylinder valve and a solenoid valve, forming a combined cylinder valve. The hydrogen outlet of the cylinder valve is connected in parallel to supply hydrogen to the downstream fuel cell. To achieve real-time sensing and health status diagnosis of each cylinder valve, this embodiment configures a separate valve drive circuit for each cylinder valve (corresponding to valve drive module 1 to valve control module N). The control module controls each valve drive circuit to provide PWM drive current to the corresponding cylinder valve, and simultaneously detects the drive current feedback value to form a closed-loop PID (Proportional Integral Differential) control of the valve. The PWM duty cycle of the valve is adjusted in real time to adjust the drive current, so as to meet the requirements of the valve opening and maintenance phases.

[0042] Understandably, the number of valve-controlled drive circuits can be selected according to actual needs. For example, an integrated valve drive circuit can be used to control all bottle valves in a unified manner, or a valve drive circuit can control the drive of two or more valves simultaneously.

[0043] like Figure 2As shown, the valve drive module specifically includes a current acquisition circuit, a PWM drive circuit, and a freewheeling circuit connected in sequence. The freewheeling circuit is located at both ends of the bottle neck valve. By setting up the freewheeling circuit, the impact of the back electromotive force when the coil is de-energized can be reduced. The input end of the current acquisition circuit is also equipped with a master drive switch. By controlling the master drive switch to open and the PWM drive circuit to output normally, the opening of the corresponding bottle neck valve can be controlled. By adding a master drive switch at the end, during circuit control, the master drive switch is opened first, and then the valve is driven by the PWM output. That is, the valve can only be controlled to open when both the master drive switch and the PWM drive circuit are outputting normally, avoiding the risk of the circuit not being able to disconnect when the PWM drive circuit is abnormal, thereby enhancing the safety of the circuit. In addition, a short circuit protection is also set to prevent the excessive current in the drive circuit from causing damage to other components when there is water in the valve or other short circuit faults. Specifically, the short circuit protection current limit value can be set based on the maximum conduction current value of the valve. When there is water in the valve coil or other short circuit faults, it plays a protective role and prevents the instantaneous excessive current in the drive circuit from causing damage to other circuits.

[0044] It is understood that the above description of the devices that can be included in the system is not limited but merely illustrative. Optionally, the system may also include other types of protection circuits, other types of monitoring circuits, etc. The above-described hydrogen storage system can be applied to rail transit trains, especially hydrogen fuel cell urban rail trains, and of course, it can also be applied to other types of trains.

[0045] This embodiment addresses the aforementioned train hydrogen storage system by providing an adjustable duty cycle PWM drive current to the cylinder valves of each hydrogen cylinder through a control valve drive circuit. Based on PID closed-loop control, the opening and output maintenance of each cylinder valve are achieved. Simultaneously, during the control process of startup and output maintenance, the drive current feedback value is detected in real time. This feedback value is used to determine the fault status of each cylinder valve and calculate its temperature rise. Furthermore, the drive current feedback value and temperature rise value of each cylinder valve are used to predict the overall health status of the hydrogen storage system. This not only effectively drives the cylinder valves but also monitors their fault status and predicts the overall health status of the hydrogen storage system. This allows for timely and accurate detection of faults when cylinder valves malfunction and early prediction of the overall health status of the hydrogen storage system, facilitating early fault warnings or the execution of corresponding protective actions.

[0046] like Figure 3 As shown, the steps of the valve drive control method applied to the above-mentioned train hydrogen storage system in this embodiment include:

[0047] Step S1. During the startup phase, the control valve drive circuit outputs PWM drive current to the valve opening of each hydrogen cylinder in the hydrogen storage system to control the opening of each valve. During the startup phase and the output maintenance phase, the duty cycle of the PWM drive current output by the control valve drive circuit is adjusted by PID closed-loop control.

[0048] In this embodiment, a PWM drive circuit is used to control the valve's conduction current. A voltage sensor is set to collect the drive voltage value, and a current sensor is set to collect the drive current feedback value. The rated drive current PWM during the start-up phase is output through the control valve drive module. on And the drive current PWM during the adjustment and maintenance phase hold The duty cycle forms a closed-loop current control for the valve. That is, the rated drive PWM for the rated start-up phase is first output by the PWM circuit. on The corresponding valve is started, and then the PWM circuit adjusts the duty cycle of the drive current to maintain the output of the drive current PWM during the maintenance phase. hold Then, it enters the output maintenance phase.

[0049] Step S2. During the control process of the startup phase and the output maintenance phase, the drive current feedback value is detected in real time, and the fault status of the valve coil is determined and the temperature rise value of the coil is calculated based on the real-time detected drive current feedback value.

[0050] In this embodiment, during the control process of the startup phase and the output maintenance phase, the corresponding drive current feedback value I is detected. feed Using this drive current feedback value I feed Determine the fault status of the valve coil to form a real-time status diagnosis of the valve.

[0051] As an optional implementation, the fault state of the valve coil can be determined based on the real-time detected drive current feedback value:

[0052] During the startup phase, the drive current feedback value I is detected. feed-on If the detected drive current feedback value I feed-on Less than the preset minimum starting current I min-on , that is I feed-on <I min-on If the valve coil is broken, it is determined that the valve cannot be opened; if the detected drive current feedback value I... feed-on Greater than the rated starting current I on The specified multiple, i.e., I feed-on >m*I on This indicates that the valve coil resistance is very low, suggesting a short circuit fault such as water ingress in the valve coil. Here, m is the short-circuit current multiple, which can be set according to actual needs. If the drive current feedback value I... feed-on If the value falls within any range other than those mentioned above, it indicates that the coil is in normal condition.

[0053] During the output sustain phase, the drive current feedback value I is detected. feed-hold If the detected drive current feedback value I feed-hold Less than the preset minimum sustaining current I min , that is I feed-on <I min If the valve coil is broken, it is determined that the valve cannot be opened. If the detected drive current feedback value I... feed-hold Greater than the rated holding current I hold The specified multiple, i.e., I feed-hold >m*I hold I hold If the rated holding current is not met, it indicates that the valve coil resistance is very low, suggesting a short circuit fault in the valve coil. If the drive current feedback value I... feed-on If the value falls within any range other than those mentioned above, it indicates that the coil is in normal condition.

[0054] In this way, different valve fault modes can be combined, based on the PWM drive value during valve startup and maintenance phases, as well as the real-time drive current feedback value I. feed Appropriate fault diagnosis strategies are adopted for valve fault diagnosis during the valve startup and maintenance phases, thereby achieving real-time status diagnosis of the valve throughout its entire operating lifecycle.

[0055] It is understandable that the short-circuit current multiple m during the startup phase and the short-circuit current multiple m during the output sustaining phase can be the same or different, depending on the actual requirements.

[0056] Furthermore, when a valve malfunction is detected, a corresponding fault alarm can be issued, such as prompting the vehicle to perform maintenance via a network interface. At the same time, when the train control device calculates the remaining available hydrogen capacity of this hydrogen storage unit, it corrects the number of faulty hydrogen cylinders to ensure the accuracy of the real-time calculated remaining available hydrogen capacity and achieve precise calculation.

[0057] As an optional implementation, after determining the fault state of the valve coil based on the real-time detected drive current feedback value, it is also possible to determine whether an abnormality warning is needed based on the real-time detected drive current feedback value. Specifically, if during the startup phase, if I... feed-on >I on +ΔI on Or I feed-on <I on -ΔI on This indicates that the coil has experienced aging or burnt-out, or other abnormal conditions. During the output sustaining phase, the I condition must be met. feed-hold >I hold +ΔI hold Or I feed-hold<I hold -ΔI hold This indicates that the coil is in an abnormal state such as aging or burning, and an abnormality warning needs to be issued. Among them, I feed-on I is the drive current feedback value detected during the startup phase. on The rated starting current, ΔI on The normal current variation range during the startup phase, I hold For the rated holding current, ΔI hold To maintain the normal range of current variation during the phase.

[0058] Compared to faults such as coil breakage or short circuits, abnormal conditions such as coil aging or burning may not affect the normal operation of the coil in the short term. However, as the abnormality progresses, it may lead to coil failure. Therefore, if the abnormal conditions of coil aging or burning can be detected in advance, early warnings can be issued to avoid failure. Using the above method, abnormal conditions such as coil aging or burning can be determined based on the real-time operating current of the coil, enabling timely warnings when abnormal conditions such as coil aging or burning are present in the valve coil, thus preventing failure.

[0059] As mentioned above, during the startup phase, if I feed-on >I on +ΔI on Or I feed-on <I on -ΔI on This indicates that the coil is aging or burned. During the output sustaining phase, if I feed-hold >I hold +ΔI hold Or I feed-hold <I hold -ΔI hold This indicates that the coil has aged or burned. To quantify the degree of degradation / deterioration during the deterioration phase and provide early warning of abnormalities, the degree of degradation / deterioration can be characterized by the difference between the real-time current value and the normal range value, thus enabling continuous monitoring during the gradual performance decline process. For example, it can be based on w on =|I feed-on -I on |Calculate the anomaly level value w during the startup phase. on According to w hold =|I feed-hold -I hold |Calculate the anomaly level value w during the output maintenance phase. hold Using the anomaly level value w during this startup phase on Output the abnormality level value w during the maintenance phase. holdIt can effectively characterize the degree of degradation and deterioration of valve coils, and thus assess the health status of valve coils.

[0060] This embodiment is based on the detected drive current feedback value I. feed-on After determining the fault state of the valve coil, and simultaneously based on the detected drive current feedback value I... feed-on The temperature rise of the valve coil is calculated, and this temperature rise value can be used to determine the temperature rise status of the valve coil, thereby predicting the health status of the valve coil.

[0061] As an optional implementation, the temperature rise of the valve coil can be calculated using the following formula:

[0062]

[0063] Among them, T coil T represents the temperature rise of the valve coil, U represents the measured value of the drive voltage, and T represents the temperature rise of the valve coil. e T represents the ambient temperature when the valve is in a cold state (i.e., not working) (for example, 20°C). k R is the reciprocal of the temperature coefficient of resistance of the coil material at 0℃. e For the coil at T e The resistance value I measured at ambient temperature feed This is the real-time detected drive current feedback value.

[0064] Step S3. Evaluate the remaining lifespan of each valve coil based on the drive current feedback values ​​during the startup and output maintenance phases, as well as the temperature rise of the coils. Combine the remaining lifespans of all valve coils to predict the health status of the hydrogen storage system.

[0065] A higher drive current and a higher temperature rise indicate a greater degree of coil aging; that is, the drive current and coil temperature rise reflect the degree of coil aging. This embodiment comprehensively assesses the health status of each valve coil by combining the drive current feedback values ​​during the startup and output maintenance phases with the coil temperature rise. By combining the health status of all valve coils, the overall health status of the hydrogen storage system can be predicted. This allows for a comprehensive and accurate prediction of the overall health status of the hydrogen storage system, taking into account the aging of all valve coils.

[0066] As an optional implementation, the temperature rise T of the valve coil can be used as a reference. coil Based on the temperature aging rate of the coil insulation material, T was evaluated. coil The equivalent life loss Lc of the valve coil at a given temperature. The equivalent life loss Lc is the difference between the actual life and the rated life. Using the equivalent life loss Lc, the total equivalent life loss of the valve coil can be further calculated.

[0067] Alternatively, the loss equivalent lifetime Lc can be calculated using the following formula:

[0068]

[0069] Where t is the coil operating temperature at T coil The operating time is TI, which stands for Temperature Index.

[0070] The total equivalent lifetime value that has been lost can be calculated using the following expression:

[0071]

[0072] Among them, L cy This represents the total equivalent lifetime value that has been lost so far. TI stands for Temperature Index, HIC for Material Half-Difference, and T... coil-i t represents the i-th operating temperature of the valve coil during actual operation. i For operating temperature at T coil-i The working time of the coil is M, which represents the number of all temperature values ​​when the coil is actually working. For example, the actual working temperature of the coil can be divided into the following categories: 50℃, 55℃, 60℃, 65℃, 70℃, 75℃, 80℃, then M is 8, and i is 1 to 8 respectively.

[0073] As an optional implementation, the health status of the hydrogen storage system can be predicted based on the drive current feedback values ​​during the startup phase and the output maintenance phase, as well as the temperature rise of the coil, in the following manner: Calculate the abnormality value w during the startup phase based on the drive current feedback values ​​during the startup phase and the output maintenance phase, respectively. on And the abnormality value w during the output maintenance phase. hold The abnormality level value w on Output the abnormality level value w during the maintenance phase. hold The predicted health status value is obtained by weighting the equivalent life index, where the equivalent life index is the sum of all currently lost equivalent life values ​​L. cy The total equivalent lifetime due to temperature aging loss is equal to the time L when the temperature index (TI) of the insulation material is reached. All The ratio between them.

[0074] For example, by applying factor constraints to the abnormal warning value and the loss equivalent lifetime respectively, the predicted health status value of each valve coil can be calculated according to the following formula:

[0075]

[0076] w on =|I feed-on -I on | (5)

[0077] whold =|I feed-hold -I hold | (6)

[0078]

[0079] Among them, W j β represents the predicted health status value of the j-th valve. j Let θ be the abnormal early warning constraint factor for the output maintenance phase of the j-th bottle valve. j Let α be the constraint factor for the equivalent life of the j-th bottle neck valve. j w is the constraint factor for abnormal early warning during the startup phase of the j-th bottle valve. on w represents the degree of abnormality during the startup phase. hold To output the anomaly level value during the maintenance phase, I feed-on I is the drive current feedback value detected during the startup phase. on For the rated starting current, I feed-hold I is the drive current feedback value detected during the startup phase. hold For the rated holding current, L All The total equivalent lifetime loss due to temperature aging is equal to the time when the temperature index (TI) of the insulation material is reached.

[0080] The above α j β i and θ j All can be configured according to actual needs, for example, based on the extracted w on w hold and L cy The changing trends of the three performance parameters, combined with subjective and objective methods, determine the weight of each parameter based on its degradation. For example, if w on w hold Impact ratio L cy The more significant the impact on health status, the corresponding w on w hold The corresponding weight values ​​are larger, and the specific values ​​need to be configured based on the actual valve material and performance degradation state. Alternatively, intelligent algorithms such as vector machines can be used to diagnose specific factor values ​​based on test data.

[0081] The predicted health status of the entire hydrogen storage system is as follows:

[0082]

[0083] Where j represents the j-th bottle valve, and N represents the number of bottle valves.

[0084] This embodiment obtains the predicted health status value W of each valve coil by applying factor constraints to the abnormal warning value and the loss equivalent life based on the fault and aging characteristics of the coil. j This allows for the prediction of the health status of the entire hydrogen storage system, enabling accurate prediction of the system's health status, reducing system failure rates and impacts, effectively improving system safety and reliability, and building an intelligent train operation and maintenance system.

[0085] Taking a 70MPa bottle neck valve as an example, it features high-current start-up and low-current maintenance. This embodiment further employs a batch-by-batch, time-sharing start-up control method for each valve. That is, after controlling and starting a batch of bottle neck valves and entering the output maintenance phase, the next batch of bottle neck valves is started. This effectively smooths the overall start-up current of the system, avoiding excessive instantaneous current and power requirements caused by simultaneous start-up of all valves. Figure 1 As shown, when starting up in batches and at different times, x (configurable) valves are started each time. When the first batch of valves is in the maintenance phase, the second batch of valves is started, and so on, until all N bottle valves are open.

[0086] This embodiment also provides a valve drive control module for a train hydrogen storage system, including a processor and a memory. The memory is used to store a computer program, and the processor is used to execute the computer program to perform the method described above.

[0087] This embodiment also provides a valve driving device for a train hydrogen storage system, including a valve driving control module and multiple valve driving modules. Each valve driving module is connected to the valve driving control module, and each valve driving module is connected to the valve of a hydrogen cylinder. The valve driving control module performs valve driving control using the method described above.

[0088] It is understood that the method described in this embodiment can be executed by a single device, such as a computer or server, or it can be applied to a distributed scenario where multiple devices cooperate to complete the task. In a distributed scenario, one of the multiple devices may execute only one or more steps of the method described in this embodiment, and the multiple devices interact to complete the method. The processor can be implemented using a general-purpose CPU, microprocessor, application-specific integrated circuit, or one or more integrated circuits, and is used to execute relevant programs to implement the method described in this embodiment. The memory can be implemented using read-only memory (ROM), random access memory (RAM), static storage devices, and dynamic storage devices. The memory can store the operating system and other applications. When the method described in this embodiment is implemented through software or firmware, the relevant program code is stored in the memory and called and executed by the processor.

[0089] This embodiment further provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described above.

[0090] Those skilled in the art will understand that the above embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create an implementation for the process. Figure 1 One or more processes and / or boxes Figure 1 The computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A valve drive control method for a train hydrogen storage system, the hydrogen storage system comprising multiple hydrogen cylinders, each of the hydrogen cylinders being equipped with a corresponding cylinder valve, characterized in that, The method includes the following steps: During the startup phase, the control valve drive circuit outputs PWM drive current to the valve opening of each hydrogen cylinder in the hydrogen storage system to control the opening of each valve. During the startup phase and the output maintenance phase, the duty cycle of the PWM drive current output by the control valve drive circuit is adjusted through PID closed-loop control. During the control process of the startup phase and the output maintenance phase, the drive current feedback value is detected in real time, and the fault status of the corresponding valve coil is determined and the temperature rise value of the corresponding valve coil is calculated based on the real-time detected drive current feedback value. The health status of the hydrogen storage system is predicted based on the drive current feedback values ​​during the startup and output maintenance phases, as well as the temperature rise of the coil.

2. The valve drive control method for a train hydrogen storage system according to claim 1, characterized in that, The step of determining the fault state of the valve coil based on the real-time detected drive current feedback value includes: During the startup phase, if the detected drive current feedback value is less than the preset minimum startup current, it is determined that the valve coil has a breakage fault; if the detected drive current feedback value is greater than a specified multiple of the rated startup current, it is determined that the valve coil has a short circuit fault. During the output sustaining phase, if the detected drive current feedback value is less than the preset minimum sustaining current, the valve coil is determined to have a breakage fault; if the detected drive current feedback value is greater than a specified multiple of the rated sustaining current, the valve coil is determined to have a short circuit fault.

3. The valve drive control method for a train hydrogen storage system according to claim 1, characterized in that, After determining the fault state of the valve coil based on the real-time detected drive current feedback value, the method further includes determining whether an abnormality warning needs to be issued based on the real-time detected drive current feedback value. Specifically, if during the startup phase, if I... feed-on >I on +ΔI on Or I feed-on on -ΔI on During the output maintenance phase, I is satisfied. feed-hold >I hold +ΔI hold Or I feed-hold hold -ΔI hild If so, it is determined that an abnormality warning needs to be issued, where I feed-on I is the drive current feedback value detected during the startup phase. on The rated starting current, ΔI on The normal current variation range during the startup phase, I hold For the rated holding current, ΔI hold To maintain the normal range of current variation during the phase.​​ 4. The valve drive control method for a train hydrogen storage system according to claim 1, characterized in that, The calculation expression for the temperature rise of the corresponding valve coil is as follows: Among them, T coil T represents the temperature rise of the valve coil, U represents the measured value of the drive voltage, and T represents the temperature rise of the valve coil. e At an ambient temperature of 20℃, T k R is the reciprocal of the temperature coefficient of resistance of the coil material at 0℃. e This is the resistance value of the coil at an ambient temperature of 20℃.

5. The valve drive control method for a train hydrogen storage system according to claim 1, characterized in that, It also includes calculating the total equivalent lifetime lost based on the calculated temperature rise of the valve coil, using the following expression: Among them, L cy This represents the total equivalent lifetime that has been lost so far, HIC is the material half-life, and T is the total equivalent lifetime that has been lost. coil-i t represents the i-th operating temperature of the valve coil during actual operation. i For operating temperature at T coil-i The working time is M, where M represents the number of all temperature values ​​during the actual operation of the coil.

6. The valve drive control method for a train hydrogen storage system according to any one of claims 1 to 5, characterized in that, The method of predicting the health status of the hydrogen storage system based on the drive current feedback values ​​of the startup phase and the output maintenance phase, as well as the temperature rise value of the coil, includes: calculating the abnormality value of the startup phase and the abnormality value of the output maintenance phase based on the drive current feedback values ​​of each valve in the startup phase and the output maintenance phase, respectively; weighting the abnormality value and the abnormality value of the output maintenance phase with the equivalent life index to obtain the predicted health status value corresponding to each valve for assessing the health status; the equivalent life index is the ratio between all the equivalent life values ​​that have been lost so far and the total equivalent life lost due to temperature aging, which is equal to the time when the temperature index of the insulation material ...

7. The valve drive control method for a train hydrogen storage system according to claim 6, characterized in that, The predicted health status value corresponding to each bottle valve is calculated according to the following formula: w on =|I feed-on -I on | w hold =|I feed-hold -I hold | Among them, W j β represents the predicted health status value of the j-th valve. j Let θ be the abnormal early warning constraint factor for the output maintenance phase of the j-th bottle valve. j Let α be the constraint factor for the equivalent life of the j-th bottle neck valve. j w is the constraint factor for abnormal early warning during the startup phase of the j-th bottle valve. on w is the abnormal warning value during the startup phase. hold To output abnormal early warning values ​​during the maintenance phase, I feed-on I is the drive current feedback value detected during the startup phase. on For the rated starting current, I feed-hold I is the drive current feedback value detected during the startup phase. hold This is the rated holding current; The predicted health status of the entire hydrogen storage system is: Where N represents the number of bottle neck valves.

8. The valve drive control method for a train hydrogen storage system according to any one of claims 1 to 5, characterized in that, The system adopts a batch-by-batch, time-based start-up control method. First, a batch of bottle valves is started and enters the output maintenance phase before the next batch of bottle valves is started.

9. A valve drive control module for a train hydrogen storage system, comprising a processor and a memory, wherein the memory is used to store a computer program, characterized in that, The processor is used to execute the computer program to perform the method as described in any one of claims 1 to 8.

10. A valve driving device for a train hydrogen storage system, characterized in that, The device includes a valve drive control module and multiple valve drive modules. Each valve drive module is connected to the valve drive control module, and each valve drive module is connected to a corresponding valve of a hydrogen cylinder. The valve drive control module performs valve drive control using the method described in any one of claims 1 to 8.

11. The valve driving device for a train hydrogen storage system according to claim 10, characterized in that, The valve drive module includes a current acquisition circuit, a PWM drive circuit, and a freewheeling circuit connected in sequence, with the freewheeling circuit located at both ends of the bottle valve.

12. The valve driving device for a train hydrogen storage system according to claim 11, characterized in that, The input terminal of the current acquisition circuit is also equipped with a master drive switch. By controlling the master drive switch to open and the PWM drive circuit to output normally, the opening of the corresponding bottle valve can be controlled.

13. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1 to 8.

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