Vehicle-mounted hydrogen system replacement method and system based on safe organic liquid

Abstract

The invention discloses a vehicle-mounted hydrogen system replacement method and system based on safe organic liquid. The method comprises the steps that the temperature value of each preset point position is collected through a sensor, when the high-low temperature difference exceeds a preset threshold value and the number of temperature abnormal points exceeds a preset threshold value, the replacement process is divided into a plurality of working time periods and interval time periods, and a booster pump is started for replacement in each working time period; and meanwhile, the real-time temperature value of each point location is recorded. Real-time high-low temperature difference and the number of real-time temperature abnormal points are calculated according to the real-time temperature value, when the real-time high-low temperature difference is smaller than the original high-low temperature difference, the working time period is prolonged, and when the number of the real-time temperature abnormal points is larger than the original temperature abnormal point number, the working time period is shortened. And when the real-time high-low temperature difference and the real-time temperature abnormal point number do not exceed the preset threshold value, the preset conventional replacement mode is recovered to complete the remaining replacement process. By implementing the technical scheme provided by the invention, the temperature uniformity of the replacement process of the vehicle-mounted hydrogen system under the extreme temperature condition is improved.

Description

Technical Field

[0001] The present application relates to the field of joint control of vehicle subsystems of different types or functions, and particularly to a method and system for replacing an on-vehicle hydrogen system based on a safe organic liquid. Background Art

[0002] Currently, with the rapid development of the new energy industry, hydrogen energy vehicles have been widely used in the transportation field due to their clean and environmentally friendly characteristics. As the core component of hydrogen energy vehicles, the safe and reliable operation of the on-vehicle hydrogen system has an important impact on the performance of the whole vehicle.

[0003] Currently, in the related art, the replacement operation of the on-vehicle hydrogen system is usually carried out by means of high-pressure gas charging and discharging or vacuum pumping. Among them, the high-pressure gas charging and discharging method dilutes and replaces the nitrogen in the system through multiple charging of high-pressure hydrogen into the system and discharging, and through multiple repeated charging and discharging processes; the vacuum pumping method is to use a vacuum pump to pump out the nitrogen in the system and then charge hydrogen for replacement. These traditional replacement methods are relatively simple to operate and can achieve a certain replacement effect under normal temperature conditions, so they are widely used in the hydrogen replacement process before the on-vehicle hydrogen system is put into use.

[0004] However, when the on-vehicle hydrogen system is replaced under extreme temperature conditions, the temperature distribution inside the system is prone to be uneven. In this case, the fluid flow rate in the high-temperature area is relatively fast, generating more frictional heat, causing the heat to continuously accumulate; while the fluid flow rate in the low-temperature area is relatively slow, and less heat accumulates. This flow rate difference will further exacerbate the vicious cycle of "large flow rate in the high-temperature area and small flow rate in the low-temperature area", making the temperature distribution more uneven and the temperature difference between the high-temperature area and the low-temperature area further expand. This phenomenon of deteriorated temperature distribution not only significantly reduces the replacement efficiency, but also may cause safety hazards due to too high or too low local temperature, seriously affecting the normal operation of the on-vehicle hydrogen system. Summary of the Invention

[0005] The present application provides a method and system for replacing an on-vehicle hydrogen system based on a safe organic liquid, which is used to improve the temperature uniformity in the replacement process of the on-vehicle hydrogen system under extreme temperature conditions.

[0006] In the first aspect of the present application, a method for replacing an on-vehicle hydrogen system based on a safe organic liquid is provided, and the method includes: Collect the temperature values at each preset point in the vehicle-mounted hydrogen system through sensors; when the high-low temperature difference exceeds the preset high-low temperature difference threshold and the number of temperature anomaly points exceeds the preset number threshold of temperature anomaly points, it is determined that the vehicle enters a special working condition; in the special working condition, the replacement process is divided into multiple working time periods and interval time periods; within each working time period, control the booster pump to start for replacement, and record the real-time temperature values of each point within the corresponding working time period; calculate the real-time high-low temperature difference and the number of real-time temperature anomaly points according to the real-time temperature values; when the real-time high-low temperature difference is less than the high-low temperature difference, extend the duration of the working time period; when the number of real-time temperature anomaly points is greater than the number of temperature anomaly points, shorten the duration of the working time period; when the real-time high-low temperature difference does not exceed the preset high-low temperature difference threshold and the number of real-time temperature anomaly points does not exceed the preset number threshold of temperature anomaly points, it is determined to exit the special working condition and resume the preset conventional replacement mode to complete the remaining replacement process.

[0007] In the above embodiment, by adopting an intermittent replacement method in the special working condition, monitoring the temperature change and dynamically adjusting the duration within each working cycle, the high-temperature area is cooled during the interval period, and the low-temperature area obtains more heat accumulation by extending the working time, alleviating the problem of uneven temperature distribution. This adaptive control method based on real-time temperature feedback breaks the vicious cycle of "high flow rate in the high-temperature area and low flow rate in the low-temperature area" in continuous replacement, and improves the replacement effect under extreme temperature conditions. At the same time, through the dual judgment mechanism of the number of temperature anomaly points and the high-low temperature difference, the temperature distribution state can be identified in time and corresponding adjustments can be made, preventing the occurrence of local overheating or overcooling phenomena, ensuring both the replacement efficiency and the operation safety.

[0008] Combined with some embodiments of the first aspect, in some embodiments, after controlling the booster pump to start for replacement within each working time period and recording the real-time temperature values of each point within the corresponding working time period, it further includes: Real-time detect the reflux flow rate and reflux volume of the organic liquid during the interval time period; calculate the cumulative reflux amount and reflux compensation coefficient during the interval time period according to the reflux flow rate and reflux volume; in the next working time period of the interval time period, increase the power of the booster pump by the power compensation value.

[0009] In the above embodiments, by monitoring the reflux state of the organic liquid in real time, the displacement loss caused by reflux is quantified into specific compensation parameters, and compensation is carried out by increasing the power of the booster pump in the next working cycle, eliminating the displacement efficiency loss caused by the reflux phenomenon in intermittent displacement, enabling the actual displacement volume in each working cycle to correspond to the expected target, and improving the continuity and stability of the intermittent displacement process. At the same time, since the compensation power is calculated based on the actual reflux volume, the compensation strategy can be adaptively adjusted according to the reflux characteristics under different working conditions, avoiding both the reduction of displacement efficiency caused by insufficient compensation and the energy waste caused by over-compensation.

[0010] Combined with some embodiments of the first aspect, in some embodiments, in the next working time period of the interval time period, after increasing the power of the booster pump by the power compensation value, it further includes: During the working time period, the working flow rate and working volume of the organic liquid are collected according to the preset flow monitoring period; according to the working flow rate and working volume, the real-time flow rate during the working time period is calculated; when the real-time flow rate deviation in a continuous preset number of flow monitoring periods exceeds the preset flow rate deviation threshold, the power of the booster pump is restored to the preset working power.

[0011] In the above embodiments, by monitoring the working state in real time after reflux compensation, when it is detected that the flow rate deviation in multiple consecutive cycles exceeds the expected range, by restoring the power of the booster pump to the preset level, the problem of over-regulation of power caused by reflux compensation is corrected in time, while ensuring the reflux compensation effect, preventing the adverse impact of the compensation power on the normal displacement process. At the same time, through the judgment mechanism of multiple consecutive cycles, the misjudgment caused by instantaneous fluctuations is avoided, and the accuracy and reliability of power regulation are improved.

[0012] Combined with some embodiments of the first aspect, in some embodiments, in each working time period, the booster pump is controlled to start for displacement, and the real-time temperature value of each point in the corresponding working time period is recorded, specifically including: At the beginning of each working time period, the booster pump is started with the preset working power; the point temperature values corresponding to each point in the working time period are collected and recorded; according to the point temperature values, the temperature change rate and the average temperature change rate corresponding to each point are calculated; when the average temperature change rate is greater than the preset average temperature change rate threshold, the real-time power of the booster pump is reduced by the preset power reduction amount; when the average temperature change rate is less than the preset average temperature change rate threshold, the real-time power of the booster pump is increased by the preset power increase amount.

[0013] In the above embodiments, by comparing the temperature change rate with a preset threshold, a differential power adjustment strategy is adopted. When the temperature changes too fast, the power is reduced to slow down the heat accumulation, and when the temperature changes too slowly, the power is increased to accelerate the heat balance. This avoids drastic fluctuations in the local temperature and keeps the temperature within a controllable range at all times. At the same time, since the power adjustment directly responds to the temperature change rate, it can intervene in the adjustment in a timely manner at the initial stage of abnormal temperature occurrence, preventing the cumulative effect of temperature distribution imbalance and improving the continuity and stability of the replacement process.

[0014] Combined with some embodiments of the first aspect, in some embodiments, when the average temperature change rate is less than the preset average temperature change rate threshold, after increasing the real-time power of the booster pump by a preset power increase amount, it further includes: Recording the temperature response time; calculating the response time deviation between the temperature response time and the preset expected response time; when the response time deviation exceeds the preset deviation range and the response time deviation is positive, increasing the power adjustment step by a preset power adjustment step ratio; when the response time deviation exceeds the preset deviation range and the response time deviation is negative, decreasing the power adjustment step by a preset power adjustment step ratio; adjusting the subsequent power increase amount according to the adjusted power adjustment step; monitoring the adjusted adjusted temperature response time; when the adjusted temperature response time exceeds the preset expected response time, triggering an abnormal prompt.

[0015] In the above embodiments, according to the deviation between the actual response time and the expected time, a differential step adjustment strategy is adopted. When the response lags, the adjustment step is increased to accelerate the adjustment speed, and when the response is ahead, the adjustment step is decreased to improve the adjustment accuracy, improving the response speed while maintaining the adjustment stability. At the same time, by continuously monitoring the adjusted response time and setting an abnormal trigger mechanism, potential abnormalities can be detected and warned in a timely manner, preventing potential safety hazards caused by out-of-control temperature.

[0016] Combined with some embodiments of the first aspect, in some embodiments, under special working conditions, the replacement process is divided into multiple working time periods and interval time periods, specifically including: Under special working conditions, constructing a temperature distribution gradient based on the temperature values at each point; dividing multiple temperature regions according to the temperature distribution gradient; calculating the average temperature within each temperature region; obtaining the average temperature difference between adjacent temperature regions; performing a ratio operation on the average temperature difference and the preset reference temperature difference to obtain a duration coefficient; multiplying the preset reference cycle duration by the duration coefficient to obtain the working time period duration of the corresponding working time period; dividing the replacement process into multiple working time periods and interval time periods according to the working time period duration and the preset interval cycle duration.

[0017] In the above embodiments, by visualizing the temperature distribution as quantifiable gradient data, an association mechanism between the temperature state and the working duration is established through region division and temperature difference calculation, enabling the duration of the working cycle to accurately correspond to the current temperature distribution state. When the temperature difference is large, the working time is extended to promote temperature equilibrium, and when the temperature difference is small, the working time is shortened to improve the replacement efficiency. At the same time, since the duration of the working cycle directly responds to the change in temperature distribution and flexibly adjusts the replacement rhythm according to the temperature characteristics under different working conditions, it not only ensures the continuity and stability of the temperature equilibrium process but also avoids energy waste caused by excessive replacement.

[0018] In combination with some embodiments of the first aspect, in some embodiments, according to the temperature distribution gradient, a plurality of temperature regions are divided, specifically including: According to the temperature distribution gradient, identify the temperature gradient mutation points; divide a plurality of temperature regions with the temperature gradient mutation points as boundaries.

[0019] In the above embodiments, the key boundary points of the temperature distribution are automatically identified through the jump characteristics of the temperature gradient, and based on these natural demarcation points, they are divided into independent regions with significant temperature characteristics, enabling each temperature region to have clear physical meanings and temperature characteristics, and being able to more accurately grasp the key characteristics of the temperature distribution, providing a reliable basis for subsequent temperature control and replacement strategy optimization.

[0020] In a second aspect, an embodiment of the present application provides a vehicle-mounted hydrogen system replacement system, which includes: one or more processors and a memory; the memory is coupled to the one or more processors, and the memory is used to store computer program code, and the computer program code includes computer instructions. The one or more processors call the computer instructions to enable the vehicle-mounted hydrogen system replacement system to execute the method described in the first aspect and any possible implementation manner in the first aspect.

[0021] In a third aspect, an embodiment of the present application provides a computer program product containing instructions. When the computer program product runs on the vehicle-mounted hydrogen system replacement system, it enables the vehicle-mounted hydrogen system replacement system to execute the method described in the first aspect and any possible implementation manner in the first aspect.

[0022] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, including instructions. When the instructions run on the vehicle-mounted hydrogen system replacement system, it enables the vehicle-mounted hydrogen system replacement system to execute the method described in the first aspect and any possible implementation manner in the first aspect.

[0023] Understandably, the on-vehicle hydrogen system replacement system provided in the second aspect above, the computer program product provided in the third aspect, and the computer storage medium provided in the fourth aspect are all used to execute the on-vehicle hydrogen system replacement method based on a safe organic liquid provided in the embodiments of the present application. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method, which will not be elaborated here.

[0024] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: In the present application, an intermittent replacement method is adopted under special working conditions, the temperature change is monitored within each working cycle and the duration is dynamically adjusted, so that the high-temperature area is cooled during the intermittent period, and the low-temperature area obtains more heat accumulation by extending the working time, alleviating the problem of uneven temperature distribution. This adaptive control method based on real-time temperature feedback breaks the vicious cycle of "large flow rate in the high-temperature area and small flow rate in the low-temperature area" in continuous replacement, and improves the replacement effect under extreme temperature conditions. At the same time, through the dual judgment mechanism of the number of temperature anomaly points and the high-low temperature difference, the temperature distribution state can be identified in time and corresponding adjustments can be made, preventing the occurrence of local overheating or overcooling phenomena, ensuring both the replacement efficiency and the operation safety.

[0025] In the present application, by monitoring the reflux state of the organic liquid in real time, the replacement loss caused by reflux is quantified into specific compensation parameters, and compensated by increasing the power of the booster pump in the next working cycle, eliminating the replacement efficiency loss caused by the reflux phenomenon in intermittent replacement, enabling the actual replacement volume in each working cycle to correspond to the expected target, and improving the continuity and stability of the intermittent replacement process. At the same time, since the compensation power is calculated based on the actual reflux volume, the compensation strategy can be adaptively adjusted according to the reflux characteristics under different working conditions, avoiding both the reduction of replacement efficiency caused by insufficient compensation and the energy waste caused by overcompensation.

[0026] 3. In the present application, by monitoring the working state after reflux compensation in real time, when it is detected that the flow deviation exceeds the expected range for multiple consecutive cycles, by restoring the power of the booster pump to the preset level, the problem of overshoot of power caused by reflux compensation is corrected in time, while ensuring the reflux compensation effect, preventing the adverse impact of the compensation power on the normal replacement process. At the same time, through the judgment mechanism of multiple consecutive cycles, false judgment caused by instantaneous fluctuations is avoided, improving the accuracy and reliability of power regulation. Description of the Drawings

[0027] Figure 1 is a flowchart of the on-vehicle hydrogen system replacement method based on a safe organic liquid in the embodiments of the present application; Figure 2It is another process schematic diagram of the on-vehicle hydrogen system replacement method based on a safe organic liquid in the embodiments of the present application; Figure 3 It is a structural schematic diagram of a system architecture to which the on-vehicle hydrogen system replacement method based on a safe organic liquid in the embodiments of the present application can be applied; Figure 4 It is an exemplary hardware structural schematic diagram of the on-vehicle hydrogen system replacement system in the embodiments of the present application. Detailed implementation manners

[0028] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. As used in the specification and appended claims of the present application, the singular forms "a", "an", "the", "above-mentioned", "said", and "this" are also intended to include the plural forms, unless there is a clear indication to the contrary in the context. It should also be understood that the term "and / or" used in the present application refers to and includes any or all possible combinations of one or more of the listed items.

[0029] Hereinafter, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0030] In the related art, the replacement of the on-vehicle hydrogen system mainly adopts the methods of high-pressure gas charging / discharging or vacuum pumping. This method operates well under normal working conditions, but has obvious defects when the system has uneven temperature distribution. Since the fluid flow rate increases in the high-temperature region, generating more frictional heat, while the flow rate slows down in the low-temperature region and less heat accumulates, this difference will lead to a vicious cycle of "higher temperature in the high-temperature region and lower temperature in the low-temperature region". This not only reduces the replacement efficiency, but also may bring safety hazards due to abnormal local temperatures, and cannot meet the operating requirements of the on-vehicle hydrogen system in special temperature environments.

[0031] In the embodiments of the present application, by establishing a temperature monitoring and dynamic adjustment mechanism, the abnormal temperature state can be identified and the special working condition processing mode can be automatically entered. In special working conditions, a periodic replacement scheme is adopted, and the working cycle duration is dynamically adjusted according to the real-time temperature state. When the temperature difference is too large, the replacement time is extended, and when the number of abnormal points increases, the strategy is adjusted in a timely manner. This intelligent temperature management scheme breaks the cycle of deteriorating temperature distribution, improves the replacement efficiency, and at the same time improves the temperature uniformity during the replacement process of the on-vehicle hydrogen system under extreme temperature conditions, providing a reliable guarantee for the stable operation of the on-vehicle hydrogen system in various temperature environments.

[0032] Figure 1 It is a flow chart of a vehicle-mounted hydrogen system replacement method based on a safe organic liquid in an embodiment of the present application, comprising the following steps: S101, collecting temperature values ​​of various preset points in the vehicle-mounted hydrogen system through sensors; Specifically, comprehensive monitoring is achieved by deploying temperature sensor arrays at key points of the on-board hydrogen system replacement system. These preset points include: pipeline connections, bends, before and after stop valves, hydrogen storage tank inlets and outlets, and other locations prone to temperature anomalies. The types of sensors used mainly include thermocouples, thermal resistors, and semiconductor temperature sensors, which are selected and configured according to different measurement environments and accuracy requirements. The sensor converts the temperature signal into a standard electrical signal, which is amplified, filtered, and converted to analog by the signal conditioning circuit, and then collected in real time by the data acquisition module. The cyclic sampling of multiple measuring points is achieved through multiplexing technology, and the sampling frequency can be dynamically adjusted according to actual needs.

[0033] S102, when the high and low temperature difference exceeds a preset high and low temperature difference threshold and the number of temperature abnormality points exceeds a preset temperature abnormality point number threshold, it is determined to enter a special working condition; Specifically, the high and low temperature difference is the difference between the maximum and minimum temperature values; the temperature anomaly point is the temperature average value of the temperature values ​​of all points, and the point exceeds the temperature average value by a preset temperature difference.

[0034] First, the collected temperature data is calculated and processed in real time. The highest and lowest temperature values ​​of all measuring points are determined by a comparison algorithm, and the difference between the two is calculated to obtain the high and low temperature difference. At the same time, the arithmetic mean of the temperature of all measuring points is calculated, and the average value is used as the reference value. The temperature anomaly judgment interval is formed by setting a preset temperature difference. When the temperature value of a certain measuring point exceeds this interval, it is marked as a temperature anomaly point, and the number of temperature anomaly points is counted. The high and low temperature difference calculated in real time is compared with the preset high and low temperature difference threshold, and the number of temperature anomaly points is compared with the preset temperature anomaly point threshold. When both conditions are met at the same time, the special working condition judgment mechanism is triggered.

[0035] S103, under special working conditions, dividing the replacement process into multiple working time periods and interval time periods; Specifically, under special working conditions, an intermittent replacement strategy is adopted to divide the continuous replacement process into multiple alternating time periods. The working time period refers to the period of actual replacement operation, during which the booster pump runs and performs the replacement function; the interval time period refers to the rest period between two working time periods, during which the replacement operation is suspended and a short static state is entered. This periodic switching control method is implemented through a timing controller, and the duration of each time period can be dynamically adjusted according to the actual working conditions.

[0036] In some embodiments of the present application, in the case of a severely uneven temperature field, an adaptive cycle control strategy is adopted: First, determine the initial cycle parameters according to the degree of temperature anomaly. For example, set the working time cycle to 30 seconds and the interval time cycle to 15 seconds. Subsequently, by monitoring the change trend of the temperature field in real time, when the temperature non-uniformity begins to improve, gradually extend the working time cycle and shorten the interval time cycle; when it is found that the temperature field fluctuates more severely, correspondingly shorten the working time cycle and extend the interval time cycle. For example, in an extremely cold environment, a longer interval time cycle (such as 20 seconds) may be adopted to ensure sufficient heat diffusion.

[0037] For the special situation in the start-up stage, a preheating period control strategy is set: In the initial stage of start-up, adopt a shorter working time cycle (such as 15 seconds) and a longer interval time cycle (such as 25 seconds). After the temperature field tends to be stable, then transition to the normal cycle configuration. This strategy can prevent severe temperature fluctuations in the start-up stage.

[0038] By establishing a time cycle allocation mechanism, fine control of the replacement process is achieved. The intermittent operation mode not only provides the necessary time for the natural equilibrium of the temperature field, but also can suppress the deterioration of the temperature field that may be caused by continuous replacement. This control strategy has strong adaptability and adjustability, can flexibly adjust the operation parameters according to different working conditions, improves the replacement efficiency and reduces the safety risk.

[0039] S104. Control the booster pump to start within each working time cycle for replacement, and record the real-time temperature values at each point within the corresponding working time cycle; Specifically, at the beginning of each working time cycle, first send a start command to the booster pump, and control the booster pump to operate at a preset working power through a frequency converter. After the booster pump starts, drive the organic liquid to flow in a directional manner to achieve replacement. At the same time, according to the preset sampling frequency, continuously collect the temperature data of each monitoring point. These real-time temperature data are converted into standard digital signals after signal conditioning and are recorded in the database in real time, forming an association with the corresponding time stamp and point information. The whole process is uniformly scheduled by an industrial controller to ensure that data collection is synchronized with the replacement process.

[0040] In some embodiments of the present application, in the case where temperature control is required when entering special working conditions, a temperature monitoring and power adjustment mechanism based on the working cycle is adopted to monitor the temperature change rate at each point in real time and make a dynamic response, which can avoid the risks brought by severe temperature fluctuations and achieve precise control of the temperature.

[0041] At the start of each working time period, start the booster pump at a preset working power. Specifically, use a high-precision timing controller to monitor the starting point of the working time period in real time. When a new cycle start signal is detected, immediately send a start command to the booster pump and adjust the output power to the preset value.

[0042] Collect and record the point temperature values corresponding to each point within the working time period. Specifically, deploy a high-precision temperature sensor network at key monitoring points to achieve comprehensive collection and recording of temperature data during the working time period. Each sensor node is equipped with a digital signal processor to convert the collected analog temperature signal into a digital signal and perform preliminary processing. Coordinate the data collection timing of each sensor node uniformly according to the preset sampling frequency. After the collected data is calibrated, it is recorded in the database in a standard format, including key information such as temperature values, timestamps, and point numbers.

[0043] According to the point temperature values, calculate the temperature change rate and average temperature change rate corresponding to each point. Specifically, the average temperature change rate is the average of the temperature change rates of all points. First, obtain the temperature values of each point at adjacent time points, and divide the temperature difference by the time interval to obtain the instantaneous temperature change rate of each point. Subsequently, perform an arithmetic average of the temperature change rates of all monitored points to obtain the overall average temperature change rate.

[0044] When the average temperature change rate is greater than the preset average temperature change rate threshold, reduce the real-time power of the booster pump by a preset power reduction amount. Specifically, by comparing the calculated average temperature change rate with the preset threshold in real time, when it is detected that the average temperature change rate exceeds the preset threshold, send a power adjustment command to adjust the real-time working power of the booster pump according to the preset reduction amount.

[0045] When the average temperature change rate is less than the preset average temperature change rate threshold, increase the real-time power of the booster pump by a preset power increase amount. Specifically, by continuously monitoring and comparing the average temperature change rate with the preset threshold in real time, when it is detected that the average temperature change rate is lower than the preset threshold, send a power increase command to adjust the real-time power of the booster pump according to the preset increase amount.

[0046] In some other embodiments of the present application, by monitoring the pressure value in real time, when abnormal pressure is detected, a pressure relief protection mechanism is started in a timely manner, including a series of measures such as stopping the operation of the booster pump, opening the pressure relief valve, and recording system parameters, effectively avoiding damage to the equipment caused by overpressure, ensuring the safe operation of the system, and improving the reliability of the entire replacement process.

[0047] The pressure values at each preset pressure monitoring point of the pressure sensor acquisition system are collected. When the pressure value at any pressure monitoring point exceeds the preset pressure threshold, it is determined that the system enters the overpressure emergency state. Specifically, pressure sensors are installed at important pressure monitoring points such as pipeline nodes, hydrogen storage devices, and the outlets of booster pumps. The pressure data detected by the pressure sensors are analyzed and processed in real time, and the pressure values at each monitoring point are compared with the pre-set safety pressure threshold. The pressure monitoring adopts a high-frequency continuous sampling method to ensure that the instantaneous changes in pressure can be captured in a timely manner. According to the characteristics of different monitoring points, corresponding pressure thresholds are set, and these thresholds fully consider the pressure-bearing capacity and safety margin of system components. When the pressure value at any monitoring point is detected to exceed the pre-set safety pressure threshold, it is determined that the current system is in an overpressure state.

[0048] In the overpressure emergency state, the booster pump is controlled to stop working, and the pressure relief valve of the corresponding pipeline is opened synchronously. Specifically, after entering the overpressure emergency state, first, an emergency shutdown command is sent to the booster pump control unit. The booster pump adopts a variable frequency speed control method. After receiving the shutdown command, the motor is controlled by the frequency converter to quickly decelerate according to the preset deceleration curve until it stops completely. At the same time, according to the position information of the overpressure point, the pressure relief valve group to be opened is determined. The pressure relief valve adopts an electromagnetic drive method and can be quickly opened after receiving the opening command. According to the degree of pressure overlimit, the opening degree of the pressure relief valve is controlled to achieve a smooth release of pressure. The opening sequence and opening degree of the pressure relief valve are dynamically adjusted by the control algorithm according to the real-time pressure condition. During this process, the pressure changes at each point are continuously monitored. Through a closed-loop control strategy, the opening degree of the pressure relief valve is adjusted according to the pressure drop rate to avoid adverse effects on the system caused by a sudden pressure drop. The system also uses check valves in the pipeline to prevent the reverse propagation of pressure waves and protect key components of the system.

[0049] After the pressure value drops to the safe range, the pressure relief valve is closed, the overpressure emergency state is exited, and the replacement process is restored. Specifically, first, the pressure values at each pressure monitoring point are continuously monitored. When the pressure values at all monitoring points drop to the pre-set safe pressure range and remain stable within this range for a certain period of time, it is determined that the pressure has returned to normal. Subsequently, the pressure relief valve closing procedure is executed. The pressure relief valve adopts a segmented deceleration closing strategy, and by controlling the action speed of the valve driver, the pressure relief valve is slowly closed. This progressive closing method can avoid pressure fluctuations caused by the rapid closing of the valve and ensure a smooth transition of the system pressure. After exiting the overpressure emergency state, the replacement process restoration program is started. First, the status of each component is checked to confirm that all equipment is in normal working condition. Then, according to the preset startup sequence, the normal working parameters of each control component are gradually restored, including flow regulation, pressure control, etc.

[0050] During the recovery process, a real-time monitoring strategy is adopted to continuously track the changes in system parameters. By dynamically adjusting the control parameters, a smooth transition to the normal operating state is ensured. The entire recovery process adopts a progressive control method to avoid the impact on the system caused by parameter mutations and improve the stability and reliability of system operation.

[0051] S105. Calculate the real-time high-low temperature difference and the number of real-time temperature anomaly points based on the real-time temperature value; Specifically, dynamic calculation and processing are performed on the collected real-time temperature data. First, the highest temperature value and the lowest temperature value are selected from the temperature values of all measurement points through a numerical comparison algorithm, and the difference between them is calculated to obtain the real-time high-low temperature difference. At the same time, the arithmetic mean method is used to calculate the average temperature value of all measurement points, which is used as the reference value, and a judgment interval is established in combination with a preset temperature deviation threshold. By traversing and comparing the relationship between the temperature value of each measurement point and this interval, the number of points exceeding the interval is counted to obtain the number of real-time temperature anomaly points. These calculation processes are carried out in real time within each data acquisition cycle to ensure the timeliness of the monitoring results.

[0052] S106. When the real-time high-low temperature difference is less than the high-low temperature difference, extend the duration of the working time period; Specifically, the current high-low temperature difference is compared with the preset high-low temperature difference threshold in real time. When it is detected that the real-time high-low temperature difference drops below the threshold, the dynamic adjustment mechanism of the working time period is triggered. According to the preset time adjustment algorithm, the duration of the next working time period is automatically extended. This adjustment process is progressive, and the smoothness of operation is ensured by gradually increasing the working time. The adjustment amount of the time period is accurately calculated according to the improvement degree of the temperature difference to ensure the rationality and effectiveness of the adjustment.

[0053] When the temperature field tends to be uniform, by appropriately extending the working time period, not only the replacement effect is maintained, but also the operation efficiency is improved. This dynamic adjustment method based on the improvement degree of the temperature difference can maximize the replacement efficiency on the premise of ensuring safety. At the same time, the progressive adjustment strategy effectively prevents the fluctuations that may be brought about by drastic adjustments and improves the smoothness and reliability of operation.

[0054] In some embodiments of the present application, in the case where precise monitoring of the temperature response characteristics is required, a closed-loop control mechanism including temperature response time recording, deviation analysis, and step size adaptive adjustment will be established, and a time series monitoring and multi-level early warning strategy will be adopted to dynamically manage the temperature response process, which can achieve precise adjustment and timely early warning of temperature control and prevent potential safety hazards caused by temperature runaway.

[0055] Record the temperature response time. Specifically, the temperature response time is the time required from the issuance of the power increase instruction until the average temperature change rate exceeds the preset average temperature change rate threshold again. Record the issuance time of the power increase instruction through a high-precision timestamp, and continuously calculate the change rate of the average temperature at the same time. The calculation of the average temperature change rate adopts the sliding time window method. Within each sampling period, calculate the change amount of the average temperature per unit time. When it is detected that the average temperature change rate exceeds the preset threshold again, record this moment, and the time difference between the two moments is the temperature response time.

[0056] Calculate the response time deviation between the temperature response time and the preset expected response time. Specifically, compare and calculate the actually measured temperature response time with the preset expected response time to obtain the response time deviation. This calculation process is completed in real time by a digital signal processor, and the calculation result is expressed in time units.

[0057] When the response time deviation exceeds the preset deviation range and the response time deviation is positive, increase the power adjustment step size by a preset power adjustment step size ratio. Specifically, monitor the response time deviation value in real time. When it is detected that the deviation value is positive and exceeds the preset range, trigger the dynamic adjustment mechanism of the power adjustment step size. The controller increases the current power adjustment step size according to the preset power adjustment step size ratio. This adjustment adopts a one-way progressive method, that is, only increase the step size when the response lags, to ensure the stability of the response. The adjusted new power adjustment step size will be applied to the next power adjustment operation until the response characteristics meet the requirements.

[0058] When the response time deviation exceeds the preset deviation range and the response time deviation is negative, decrease the power adjustment step size by a preset power adjustment step size ratio. Specifically, monitor the response time deviation. When it is detected that the deviation value is negative and exceeds the preset range, start the reduction adjustment mechanism of the power adjustment step size. The controller decreases the current power adjustment step size according to the preset power adjustment step size ratio.

[0059] Adjust the subsequent power increase amount according to the adjusted power adjustment step size. Specifically, according to the new power adjustment step size value, recalculate and set the increment value during the subsequent power increase process. The controller uses the adjusted power adjustment step size as the reference increment, and combines the current state and the target power value to formulate a new power increase plan.

[0060] Monitor the adjusted temperature response time. Specifically, immediately start a new round of temperature response time monitoring after the power adjustment step size is adjusted. The monitoring process uses a high-precision time counter to record the time interval from the issuance of the new power increase instruction to the temperature change rate reaching the preset threshold. Continuously collect temperature signals through the data acquisition module, calculate the temperature change rate in real time, and compare and analyze it with the previous response characteristics to evaluate the adjustment effect.

[0061] When the adjusted temperature response time exceeds the preset expected response time, an abnormal prompt is triggered. Specifically, the adjusted temperature response time is compared with the preset expected response time in real time. When it is detected that the response time exceeds the expected range, the abnormal prompt mechanism is automatically triggered. Through a multi-level early warning method, a warning signal is sent to the operator or the monitoring system. This process includes multiple links such as numerical comparison, threshold judgment, signal triggering, and information display to ensure that the abnormal state can be detected and processed in a timely manner.

[0062] In some embodiments of the present application, in extreme environments or special working conditions, the abnormal judgment criteria and early warning strategies are adjusted. For example, in a low-temperature environment, by introducing a temperature compensation factor, the early warning threshold is appropriately relaxed to avoid false alarms. At the same time, the early warning level and response strategy are dynamically adjusted according to the equipment operation status and environmental conditions to ensure the accuracy and practicality of the early warning mechanism. For different types of abnormal situations, corresponding processing suggestions can be automatically generated to assist the operator in fault diagnosis and processing.

[0063] S107. When the number of real-time temperature abnormal points is greater than the number of temperature abnormal points, shorten the duration of the working time period; Specifically, compare the collected temperature data with the preset normal temperature range, and count the number of temperature abnormal points at the current moment. When the number of real-time detected temperature abnormal points exceeds the preset threshold of the number of temperature abnormal points, the working time period adjustment mechanism is automatically triggered, and the duration of the working time period is reduced according to the preset shortening ratio.

[0064] S108. When the real-time high-low temperature difference does not exceed the preset high-low temperature difference threshold and the number of real-time temperature abnormal points does not exceed the preset threshold of the number of temperature abnormal points, it is determined to exit the special working condition and resume the preset conventional replacement mode to complete the remaining replacement process.

[0065] Specifically, the current operation status is evaluated through real-time monitoring and a dual judgment mechanism, continuously comparing the relationship between the real-time high-low temperature difference and the preset threshold, and the number of temperature abnormal points and the preset threshold. When the monitoring data shows that these two key parameters simultaneously meet the conditions for exiting the special working condition, the mode switching program is automatically started. This process uses a digital signal processor for automatic control to ensure the continuity and stability of operation.

[0066] In terms of specific implementation, multiple technical routes can be adopted to complete the determination and switching process. The hard threshold judgment method is applicable to direct switching under stable working conditions by setting a fixed judgment criterion; the fuzzy judgment method makes the judgment more flexible by establishing a complete set of fuzzy rules and comprehensively evaluating multiple parameters; the progressive judgment method realizes step-by-step judgment and switching by setting a transition interval, making the conversion process smoother; the intelligent evaluation method introduces machine learning algorithms, which can adaptively adjust the threshold to improve the judgment accuracy.

[0067] In the above embodiments, by using the intermittent replacement method under special working conditions, monitoring the temperature change within each working cycle and dynamically adjusting the duration, the high-temperature area is cooled during the intermittent period, and the low-temperature area obtains more heat accumulation by extending the working time, alleviating the problem of uneven temperature distribution. This adaptive control method based on real-time temperature feedback breaks the vicious cycle of "high flow rate in the high-temperature area and low flow rate in the low-temperature area" in continuous replacement, improving the replacement effect under extreme temperature conditions. At the same time, through the dual judgment mechanism of the number of temperature anomaly points and the high-low temperature difference, the temperature distribution state can be timely identified and corresponding adjustments can be made, preventing the occurrence of local overheating or overcooling phenomena, ensuring both the replacement efficiency and the operation safety.

[0068] In some other embodiments of the present application, in the above Figure 1 shown steps, there are working interval periods during periodic replacement, and natural reflux phenomena of the organic liquid will occur during these intervals, affecting the replacement effect. To solve this problem, the replacement method of the on-vehicle hydrogen system based on safe organic liquid provided by the present application, by real-time monitoring the reflux characteristics during the interval period, establishes a dynamic correlation mechanism between the reflux amount and power compensation, quantifies the reflux influence during the interval period, and offsets the adverse effects brought by the reflux through the compensation of the booster pump power in the next working cycle, improving the continuity and efficiency of the replacement process, and enhancing the practicability and reliability of the periodic replacement scheme under special working conditions.

[0069] As Figure 2 shown, it is another process schematic diagram of the replacement method of the on-vehicle hydrogen system based on safe organic liquid provided by the embodiment of the present application, including the following steps: S201. Collect the temperature values of each preset point in the on-vehicle hydrogen system through sensors; S202. When the high-low temperature difference exceeds the preset high-low temperature difference threshold and the number of temperature anomaly points exceeds the preset temperature anomaly point threshold, it is determined to enter the special working condition; S203. Under special working conditions, construct a temperature distribution gradient according to the temperature values of each point; Specifically, under special working conditions, based on the real-time temperature data collected by temperature sensors distributed at each monitoring point, a temperature distribution gradient model is constructed through numerical analysis methods. This process first performs spatial mapping on the collected discrete temperature data to establish a temperature distribution lattice in a three-dimensional coordinate system, and then uses an interpolation algorithm to process the lattice data to generate a continuous temperature gradient field.

[0070] In some embodiments of the present application, under special working conditions, a temperature distribution gradient model is further constructed through numerical analysis methods. First, spatial mapping is performed on the discrete temperature data to establish a temperature distribution lattice in a three-dimensional coordinate system, and then algorithms such as linear interpolation method, polynomial interpolation method, inverse distance weighting method, or Kriging interpolation method are used to generate a continuous temperature gradient field.

[0071] S204. Divide multiple temperature regions according to the temperature distribution gradient; Specifically, based on the constructed temperature distribution gradient data, the entire monitoring space is divided into multiple regions with different temperature characteristics through a region division algorithm. This process first determines the temperature threshold and the region division standard, and then uses a clustering analysis method to perform hierarchical processing on the temperature gradient field, and finally forms the temperature region boundary to realize the classification and quantitative description of the temperature distribution characteristics.

[0072] In some embodiments of the present application, dividing multiple temperature regions can be achieved by identifying temperature gradient mutation points, which may include the following steps: Identify temperature gradient mutation points according to the temperature distribution gradient. Specifically, based on the temperature distribution gradient data constructed during the operation of the on-vehicle hydrogen system, the partitioning and anomaly identification of the temperature field are realized. Through the region division algorithm, the entire monitoring space is divided into multiple regions with different temperature characteristics, and a variety of methods such as the fixed threshold method, dynamic clustering method, density clustering method, and hierarchical clustering method are used to realize the hierarchical expression of the temperature distribution. At the same time, the temperature field is deeply analyzed through a mutation point detection algorithm to identify the key positions where the temperature changes violently. This process comprehensively uses a variety of identification methods such as the threshold detection method, wavelet analysis method, curvature analysis method, and deep learning method, and by calculating the first derivative and second derivative of the temperature gradient, combined with the preset mutation determination standard, the positioning of the temperature anomaly region is realized.

[0073] Divide multiple temperature regions with the temperature gradient mutation points as the boundaries. Specifically, after identifying the temperature gradient mutation points, these mutation points are used as natural boundaries, and the entire temperature field is divided through a region segmentation algorithm. This process first determines the spatial distribution characteristics of the mutation points, establishes the connection relationship of the mutation points, forms a closed partition boundary, and then divides the entire monitoring space into multiple regions with relatively uniform temperature characteristics based on the boundary information to realize the natural partitioning of the temperature field.

[0074] S205. Calculate the average temperature in each temperature region; Specifically, first, based on the identified temperature gradient mutation points, taking these mutation points as natural boundaries, through various boundary division algorithms such as the direct connection method, minimum spanning tree method, region growing method, and level set method, the entire monitoring space is divided into multiple regions with relatively uniform temperature characteristics.

[0075] After completing the region division, in-depth statistical analysis is carried out on each temperature region. Through various calculation methods such as the arithmetic average method, weighted average method, volume weighted method, and adaptive weighted method, the average temperature is calculated by calculating the average of the temperature data within the region. When encountering special situations such as uneven temperature distribution, optimization strategies will be automatically activated, including measures such as increasing the sampling points, refining the weight calculation, and optimizing the update strategy, to ensure the accuracy of the calculation results.

[0076] S206. Obtain the average temperature difference between adjacent temperature regions; Specifically, after obtaining the average temperature of each temperature region, establish a regional adjacency relationship graph, identify adjacent region pairs through topological analysis, and then calculate the temperature difference between each pair of adjacent regions.

[0077] First, construct a regional boundary contact matrix to determine the spatial adjacency relationship between regions. Subsequently, extract the average temperature data of adjacent regions and obtain the temperature difference through numerical calculation.

[0078] S207. Perform a ratio operation on the average temperature difference and a preset reference temperature difference to obtain a duration coefficient; Specifically, after obtaining the average temperature difference between adjacent temperature regions, perform a ratio operation on the average temperature difference and the preset reference temperature difference to obtain a duration coefficient. The preset reference temperature difference is artificially set in advance through system safety thresholds, equipment form specifications, and historical operation data. A reference temperature difference database for the sub-region division framework is established, and the corresponding reference temperature difference is selected under different circumstances.

[0079] In the specific implementation, multi-level calculation strategies such as the direct ratio method, weighted ratio method, segmented ratio method, and adaptive ratio method are adopted. Among them, the direct ratio method is based on simple numerical division, establishes a reference temperature difference query table and configures an outlier processing mechanism; the weighted ratio method introduces a temperature difference weight coefficient, constructs a weight calculation model and sets a dynamic correction mechanism; the segmented ratio method realizes non-linear mapping through multi-interval threshold division, establishes a segmented threshold system and optimizes the interval division strategy; the adaptive ratio method realizes dynamic adjustment of the reference temperature difference, constructs a self-learning model and continuously optimizes the update strategy.

[0080] S208. Multiply the preset reference period duration by the duration coefficient to obtain the working time period duration of the corresponding working time period; Specifically, after obtaining the duration coefficient, the specific duration of the working time period is dynamically determined through a multiplication operation with the preset reference cycle duration.

[0081] By establishing such a complete calculation mechanism for the working cycle duration, the dynamic adjustment and precise control of the running time are realized. Through the flexible application of various calculation methods, the accuracy and reliability of the working cycle adjustment are ensured, which not only provides dynamic optimization of the response time but also provides an important basis for the adaptive adjustment of the control strategy.

[0082] S209. Divide the replacement process into multiple working time periods and interval time periods according to the working time period duration and the preset interval period duration; S210. Control the booster pump to start within each working time period for replacement, and record the real-time temperature values at each point within the corresponding working time period; S211. Real-time detect the reflux flow rate and reflux volume of the organic liquid within the interval time period; Specifically, within the interval time period, the real-time monitoring of the reflux flow rate and volume of the organic liquid is realized through a flow sensor network. Multilevel detection strategies such as a flow rate detection scheme, a volume measurement scheme, and a comprehensive monitoring scheme are adopted. Among them, the flow rate detection scheme is realized through various methods such as ultrasonic flow meters, electromagnetic flow meters, and turbine flow meters, and the detection accuracy is ensured through multi-point sensor arrangement and an abnormal warning mechanism; the volume measurement scheme adopts cumulative quantity calculation, real-time integration method, and differential measurement method, and the measurement accuracy is ensured through constructing a measurement model and a compensation mechanism; the comprehensive monitoring scheme realizes the dynamic optimization adjustment of the detection process through multi-parameter fusion and intelligent data processing.

[0083] S212. Calculate the cumulative return flow and return compensation coefficient within the interval time period according to the reflux flow rate and reflux volume; Specifically, the return compensation coefficient is the product of the cumulative return flow and the preset compensation constant. First, according to the reflux flow rate and volume data, the cumulative return flow within the interval time period is obtained by using an integral calculation method, and then the cumulative return flow is multiplied by the preset compensation constant to obtain the return compensation coefficient.

[0084] Multilevel calculation strategies such as cumulative return flow calculation, compensation coefficient calculation, and dynamic optimization scheme are adopted. Among them, the cumulative return flow calculation is realized through methods such as time integration method and segmented summation method, and an update strategy is configured to ensure the calculation accuracy; the compensation coefficient calculation adopts methods such as linear compensation method and non-linear mapping method, and the calculation accuracy is improved through constructing a compensation model and an optimization algorithm; the dynamic optimization scheme realizes the continuous optimization of the compensation process through real-time parameter adjustment and intelligent compensation control.

[0085] S213. In the next working time period of the interval time period, increase the power of the booster pump by the power compensation value; Specifically, first, according to the preset working power reference value, combined with the reflux compensation coefficient obtained in the early stage, the power compensation value is obtained through multiplication operation, and then the output power of the booster pump is increased accordingly.

[0086] Adopt multi-level adjustment strategies such as power compensation calculation, power adjustment execution, and safety protection schemes. Among them, power compensation calculation is realized by means of linear compensation method, step adjustment method, etc., and a protection mechanism is configured to ensure the accuracy of calculation; power adjustment execution adopts smooth transition control and hierarchical adjustment schemes, and improves the execution accuracy by constructing a control model and optimizing the adjustment process; the safety protection scheme realizes the safety and reliability of the adjustment process through multiple limit controls and intelligent protection mechanisms.

[0087] In some embodiments of the present application, since the above steps change the power of the booster pump according to the reflux situation in the interval time period, but the changed power may affect the normal replacement, it is necessary to detect the working data of the organic liquid in the next working time period, and intervene in the power of the booster pump again in case of abnormality. The specific steps are as follows: Collect the working flow rate and working volume of the organic liquid at the preset flow monitoring period within the working time period. Specifically, within the working time period, according to the preset flow monitoring period, the working flow rate and working volume of the organic liquid are collected and monitored in real time through the sensor network.

[0088] Calculate the real-time flow rate within the working time period according to the working flow rate and working volume. Specifically, based on the principle of fluid mechanics, combined with numerical calculation methods, the real-time flow rate value is calculated through the product of the working flow rate and the cross-sectional area, or the change rate of the working volume with time, and the accuracy of the calculation result is ensured through data processing and optimization algorithms.

[0089] When the real-time flow rate deviation within a continuous preset number of flow monitoring periods exceeds the preset flow rate deviation threshold, restore the power of the booster pump to the preset working power. Specifically, by continuously monitoring the difference between the real-time flow rate and the preset standard flow rate, when the deviation within a continuous specified number of flow monitoring periods exceeds the preset threshold, the automatic recovery mechanism of the booster pump power is triggered. First, calculate the real-time flow rate deviation within each monitoring period, judge by comparing with the preset threshold. When the deviation in multiple consecutive periods continues to exceed the limit, issue an instruction to adjust the booster pump power back to the preset working power level, realizing the dynamic adjustment and optimal control of the operating state.

[0090] In some embodiments of the present application, by setting a hydrogen leakage sensor to monitor the hydrogen concentration value in real time, when hydrogen leakage is detected, an emergency protection mechanism is immediately triggered, including a series of measures such as stopping the operation of the booster pump, closing the pipeline, and recording leakage parameters, effectively preventing the expansion of hydrogen leakage accidents, ensuring operation safety, and improving the reliability and safety of the entire replacement process.

[0091] The hydrogen concentration values at each preset hydrogen monitoring point are collected by the hydrogen leakage sensor. When the hydrogen concentration value at any hydrogen monitoring point exceeds the preset concentration threshold, it is determined that the leakage emergency state is entered. Specifically, hydrogen leakage sensors are installed at preset monitoring points where leakage is likely to occur, such as pipeline joints, valve interfaces, and around hydrogen storage devices. The hydrogen concentration data detected by the hydrogen leakage sensors is analyzed and processed in real time, and the hydrogen concentration values at each hydrogen monitoring point are compared with the pre-set safety concentration threshold. When it is detected that the hydrogen concentration value at any hydrogen monitoring point exceeds the preset safety concentration threshold, it is determined that the current is in a hydrogen leakage state. This multi-point real-time monitoring method ensures that abnormalities can be detected in a timely manner at the initial stage of hydrogen leakage, providing sufficient response time for the implementation of subsequent emergency treatment measures. At the same time, by reasonably setting the preset concentration threshold, both the detection sensitivity is ensured and false alarms caused by environmental interference are avoided.

[0092] In the leakage emergency state, the booster pump is controlled to stop working, and the electromagnetic valves of the corresponding pipelines are closed synchronously. Specifically, when the leakage emergency state is entered, the emergency protection program is immediately started. The primary measure is to control the booster pump to stop working. An emergency shutdown instruction is sent to the control unit of the booster pump, causing the booster pump to rapidly reduce its speed according to the safe shutdown procedure until it completely stops. This progressive shutdown method can avoid pressure fluctuations caused by the sudden stop of the pump body, ensuring a smooth transition even in an emergency. At the same time, by executing the electromagnetic valve control program, isolation measures are implemented on the pipelines related to the leakage point. Specifically, according to the position information of the leakage point, the electromagnetic valves that need to be closed are identified, and a closing instruction is sent to these valves. After receiving the instruction, the electromagnetic valves act quickly to seal and isolate the relevant pipelines, effectively blocking the path of continuous hydrogen leakage. This coordinated control strategy for booster pump shutdown and pipeline isolation adopts a timing control method to ensure that each executing component operates according to the predetermined timing, avoiding new safety hazards caused by improper control timing.

[0093] Record the leakage parameters when entering the leakage emergency state. The leakage parameters include the location information of the leakage point, the pressure value, temperature value, and flow value at the leakage moment. Specifically, first, record the specific location information of the leakage point. By analyzing the numbers and installation positions of the hydrogen leakage sensors that trigger the alarm and combining with the pipeline layout diagram, accurately locate the specific area where the leakage occurs. The recording of the location information includes the pipe section number where the leakage point is located, the relative position from the reference point, and the distribution of important components around. At the same time, obtain key parameters such as pressure, temperature, and flow at the leakage moment through the data acquisition module. The pressure value is collected by pressure sensors distributed everywhere, and record the pressure data and pressure gradient information of each measuring point when the leakage occurs; the temperature value is collected by the temperature sensor network to obtain the temperature distribution state of each point; the flow value is recorded by the flowmeter for the flow data of each pipeline when the leakage occurs.

[0094] After receiving the information that the maintenance is completed, conduct a tightness test. When the tightness test result meets the preset tightness requirements, exit the leakage emergency state and resume the replacement process. Specifically, first, after receiving the confirmation signal that the maintenance is completed, start the tightness test program. The test program first conducts zoning management, divides the area to be tested into multiple independent test segments, and pressurize each test segment in turn according to the preset test order. During the specific test process, control the booster pump to pressurize the test segment at a stable pressure increase rate until the preset test pressure value is reached. After reaching the test pressure, enter the pressure holding stage. During this period, continuously monitor the pressure change through a high-precision pressure sensor, and compare the recorded pressure data with the preset allowable range of pressure decay in real time. When the pressure decay rate of all test segments is within the allowable range and the duration reaches the preset requirement, determine that the tightness test is qualified. At this time, send a test pass signal and execute the program to exit the leakage emergency state. The exit process includes restoring the normal working state of each control component, removing the pipeline isolation, and restarting the control program. Finally, gradually resume to the replacement working state according to the normal startup process. The entire recovery process adopts a progressive control strategy to ensure that each component smoothly transitions to the normal working state and avoid the occurrence of sudden failures.

[0095] S214. Calculate the real-time high-low temperature difference and the number of real-time temperature anomaly points according to the real-time temperature value; S215. When the real-time high-low temperature difference does not exceed the preset high-low temperature difference threshold and the number of real-time temperature anomaly points does not exceed the preset temperature anomaly point number threshold, determine to exit the special working condition and resume the preset conventional replacement mode to complete the remaining replacement process.

[0096] Steps S201 - S202, S209 - S210, S214 - S215 and Figure 1In the illustrated embodiments, steps S101 - S105 and S108 are similar. Refer to the descriptions in steps S101 - S105 and S108, and details will not be repeated here.

[0097] In the above - mentioned embodiments, by establishing a regional division mechanism based on temperature gradient and a periodic replacement strategy with dynamic compensation, precise temperature control of the on - vehicle hydrogen system under special working conditions is achieved. The on - vehicle hydrogen system is divided into multiple temperature regions according to the temperature distribution gradient. The working - cycle duration is calculated using the regional temperature - difference ratio, and a quantitative correlation between the working cycle and the temperature distribution is established. At the same time, a reflux compensation mechanism is introduced. By real - time monitoring the reflux characteristics during the interval period, the compensation coefficient is calculated and the power of the booster pump is dynamically adjusted in the next cycle. It can not only adaptively adjust the replacement strategy according to the actual temperature distribution, but also effectively offset the reflux influence during the interval period, ensuring the continuity and uniformity of the replacement process. Through the dual regulation of temperature gradient and reflux compensation, the temperature - equalization ability and replacement efficiency in extreme temperature environments are improved.

[0098] Figure 3 It is a structural schematic diagram of a system framework to which the replacement method of the on - vehicle hydrogen system based on a safe organic liquid in the embodiments of the present application can be applied.

[0099] Please refer to Figure 3 , the on - vehicle hydrogen system replacement system includes an on - vehicle hydrogen system, a liquid storage tank, a hydrogen storage device, and a booster pump.

[0100] The on - vehicle hydrogen system is the core component of the entire replacement system and is the target system that needs to be hydrogen - replaced. Multiple temperature sensors are set in the on - vehicle hydrogen system to monitor the temperature values at various points in the system in real time. These temperature data are used to determine whether the system is in a special working condition and provide a basis for the control strategy during the replacement process. The arrangement of the temperature sensors ensures comprehensive monitoring of the system temperature distribution and helps to detect temperature anomalies in a timely manner.

[0101] The liquid storage tank is used to store the organic liquid for replacement and is the liquid supply source of the entire circulation system. The liquid storage tank supplies the organic liquid to the system through the liquid outlet and receives the organic liquid after replacement through the liquid return port, thus realizing the recycling of the organic liquid. The liquid storage tank is equipped with a liquid - level sensor to monitor the liquid - level state in the tank and ensure the safety of the system operation.

[0102] The main function of the hydrogen storage device is to receive and process the hydrogen replaced from the on - vehicle hydrogen system. It separates the hydrogen in the organic liquid through a gas - liquid separation structure, realizing the safe storage and recycling of hydrogen. The design of the hydrogen storage device ensures that hydrogen will not leak into the atmosphere during the replacement process, improving the environmental protection and safety of the system.

[0103] The booster pump is the power source of the system and is responsible for driving the organic liquid to circulate in the system. It pressurizes the organic liquid in the liquid storage tank and then transports it to the intake port of the vehicle-mounted hydrogen system to ensure that there is sufficient pressure to push the hydrogen out during the replacement process. The start and stop of the booster pump are controlled by the control module according to the working time cycle to achieve the optimal replacement effect.

[0104] The hydrogen replacement system of the vehicle-mounted hydrogen system in this application uses an internal circulation method for hydrogen replacement. Compared with the currently commonly used replacement method of using high-pressure gas for replacement and directly discharging the hydrogen into the atmosphere, this method not only causes waste of hydrogen resources, but also has potential safety hazards. Moreover, the hydrogen discharged into the atmosphere will damage the ozone layer and have an adverse impact on the environment.

[0105] This application realizes the safe recovery and recycling of hydrogen through a closed internal circulation system. Specifically, the organic liquid in the liquid storage tank is transported to the vehicle-mounted hydrogen system for replacement under the action of the booster pump, and the replaced hydrogen then enters the hydrogen storage device. In the hydrogen storage device, through a special gas-liquid separation structure, the hydrogen is dissolved in the organic liquid, and the organic liquid carrying the hydrogen returns to the liquid storage tank through the return pipeline, thus forming a complete closed circulation loop. The entire system is equipped with multiple sensors for real-time monitoring to ensure safe and reliable operation.

[0106] This internal circulation design not only realizes the recycling of hydrogen and avoids resource waste, but also effectively prevents potential safety hazards caused by hydrogen leakage because the entire process is carried out in a closed system. At the same time, it also eliminates the damage to the ozone layer.

[0107] The following introduces the exemplary vehicle-mounted hydrogen system replacement system 400 provided by the embodiments of this application. Figure 4 It is an exemplary hardware structure diagram of the vehicle-mounted hydrogen system replacement system 400 provided by the embodiments of this application.

[0108] In some embodiments, the vehicle-mounted hydrogen system replacement system 400 is a computer device or includes a computer device. The computer device includes a processor, a memory, and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data. The network interface of the computer device is used to communicate with other external terminals or servers through a network connection. In some embodiments, the network interface can be a wired network interface, and in some embodiments, the network interface can also be a wireless network interface. When the computer program is executed by the processor, it implements the method in the embodiments of the present application.

[0109] Those skilled in the art can understand that Figure 4 the structure shown in is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0110] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0111] As used in the above embodiments, depending on the context, the term "when..." can be interpreted as "if...", or "after...", or "in response to determining...", or "in response to detecting...". Similarly, depending on the context, the phrase "when determining..." or "if detecting (the stated condition or event)" can be interpreted as "if determining...", or "in response to determining...", or "when detecting (the stated condition or event)", or "in response to detecting (the stated condition or event)".

[0112] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line) or a wireless manner (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid-state drive), etc.

[0113] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware with a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The foregoing storage medium includes: various media that can store program codes such as ROM or random access memory RAM, magnetic disks, or optical discs.

Claims

1. A vehicle-mounted hydrogen system replacement method based on safe organic liquid, characterized in that: include: The temperature value of each preset point in the vehicle hydrogen system is collected by sensors; When the high and low temperature difference exceeds the preset high and low temperature difference threshold and the number of temperature abnormality points exceeds the preset temperature abnormality point number threshold, it is determined to enter a special working condition; The high and low temperature difference is the difference between the maximum and minimum values ​​of the temperature values; the temperature abnormal point is a point that exceeds the temperature average value by a preset temperature difference; the temperature average value is the average value of the temperature values ​​of all points; Under the special working condition, the replacement process is divided into a plurality of working time periods and interval time periods; the relationship between the working time period and the interval time period is that there is one interval time period between two adjacent working time periods; Controlling the booster pump to start in each working time period, performing replacement, and recording the real-time temperature value of each point in the corresponding working time period; Calculate the real-time high and low temperature difference and the number of real-time temperature abnormal points according to the real-time temperature value; When the real-time high and low temperature difference is less than the high and low temperature difference, extending the duration of the working time period; When the number of the real-time temperature abnormality points is greater than the number of the temperature abnormality points, shortening the duration of the working time period; When the real-time high and low temperature difference does not exceed the preset high and low temperature difference threshold and the number of real-time temperature anomaly points does not exceed the preset temperature anomaly point threshold, it is determined to exit the special working condition and restore the preset regular replacement mode to complete the remaining replacement process.

2. The method according to claim 1, characterized in that After controlling the booster pump to start in each working time period, performing replacement, and recording the real-time temperature value of each point in the working time period, the method further includes: Real-time detection of the reflux flow rate and reflux volume of the organic liquid during the interval time period; According to the reflux flow rate and the reflux volume, the cumulative reflux flow and the reflux compensation coefficient within the interval time period are calculated; the reflux compensation coefficient is the product of the cumulative reflux flow and a preset compensation constant; In the next working time period of the interval time period, the power of the booster pump is increased by a power compensation value; the power compensation value is the product of a preset working power and the reflux compensation coefficient.

3. The method according to claim 2, characterized in that In the next working time period of the interval time period, after increasing the power of the booster pump by the power compensation value, the method further comprises: Collecting the working flow rate and working volume of the organic liquid according to a preset flow monitoring period within the working time period; Calculating the real-time flow rate within the working time period according to the working flow rate and the working volume; When the real-time flow deviation within a preset number of flow monitoring cycles exceeds a preset flow deviation threshold, the power of the boost pump is restored to the preset working power; the real-time flow deviation is the difference between the real-time flow and the preset standard flow.

4. The method according to claim 1, characterized in that The method of controlling the booster pump to start and replace the booster pump in each working time period and recording the real-time temperature value of each point in the working time period specifically includes: At the beginning of each working time period, starting the booster pump with a preset working power; Collect and record the point temperature values ​​corresponding to each point within the working time period; According to the point temperature values, the temperature change rate and the average temperature change rate corresponding to each point are calculated; the average temperature change rate is the average value of the temperature change rates of all points; When the average temperature change rate is greater than a preset average temperature change rate threshold, reducing the real-time power of the boost pump by a preset power reduction amount; When the average temperature change rate is less than a preset average temperature change rate threshold, the real-time power of the boost pump is increased by a preset power increase amount.

5. The method according to claim 4, characterized in that After increasing the real-time power of the boost pump by a preset power increase amount when the average temperature change rate is less than a preset average temperature change rate threshold, the method further includes: Recording the temperature response time; the temperature response time is the time required from the issuance of the power increase instruction to the time when the average temperature change rate exceeds the preset average temperature change rate threshold again; Calculating a response time deviation between the temperature response time and a preset expected response time; When the response time deviation exceeds a preset deviation range and the response time deviation is positive, increasing the power adjustment step by a preset power adjustment step ratio; When the response time deviation exceeds a preset deviation range and the response time deviation is negative, reducing the power adjustment step by a preset power adjustment step ratio; According to the adjusted power regulation step length, the subsequent power boost amount is adjusted; Monitor the adjusted temperature response time after adjustment; When the temperature adjustment response time exceeds the preset expected response time, an abnormal prompt is triggered.

6. The method according to claim 1, characterized in that Under the special working conditions, the replacement process is divided into a plurality of working time periods and interval time periods, specifically including: Under the special working condition, a temperature distribution gradient is constructed according to the temperature value at each point; Dividing a plurality of temperature zones according to the temperature distribution gradient; Calculate the average temperature within each of the temperature zones; Get the average temperature difference between adjacent temperature areas; Perform a ratio operation on the average temperature difference and a preset reference temperature difference to obtain a duration coefficient; Multiplying the preset reference cycle duration by the duration coefficient to obtain the working time cycle duration of the corresponding working time cycle; According to the duration of the working time period and the preset interval period, the replacement process is divided into a plurality of working time periods and interval time periods.

7. The method according to claim 6, characterized in that The step of dividing a plurality of temperature zones according to the temperature distribution gradient specifically includes: According to the temperature distribution gradient, identifying the temperature gradient mutation point; A plurality of temperature zones are divided with the temperature gradient mutation point as the boundary.

8. A vehicle-mounted hydrogen system replacement system, characterized in that: The on-board hydrogen system replacement system includes: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code includes computer instructions, and the one or more processors call the computer instructions to enable the on-board hydrogen system replacement system to execute the method as described in any one of claims 1-7.

9. A computer program product comprising instructions, characterized in that When the computer program product runs on an on-board hydrogen system replacement system, the on-board hydrogen system replacement system is enabled to perform the method according to any one of claims 1 to 7.

10. A computer-readable storage medium comprising instructions, characterized in that: When the instruction is executed on the on-board hydrogen system replacement system, the on-board hydrogen system replacement system is caused to execute the method as described in any one of claims 1-7.

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