Gas storage control method and system

Abstract

This application relates to the technical field of program control, and particularly to a gas storage control method and system. The method includes the following steps: When the air pressures of the on-vehicle gas cylinder and the medium-pressure gas cylinder are balanced, obtain the first air pressure, where the first air pressure is the current air pressure of the medium-pressure gas cylinder; at the same time, obtain the current air pressure of the high-pressure gas cylinder, denoted as the second air pressure; according to the air pressure difference between the first air pressure and the second air pressure, calculate the risk value of switching the medium-pressure gas cylinder to the high-pressure gas cylinder through a risk value calculation function. If the risk value is greater than a preset risk threshold, then perform the following steps: Stop the hydrogen storage chamber from using the air compressor to boost the pressure of the high-pressure gas cylinder, and make the hydrogen storage chamber use the air compressor to boost the pressure of the medium-pressure gas cylinder until the air pressure in the medium-pressure gas cylinder reaches the medium-pressure switching threshold, and then trigger the medium-pressure gas cylinder to switch to the high-pressure gas cylinder to supply air to the on-vehicle gas cylinder. This method can store hydrogen in the on-vehicle gas cylinder more safely.

Description

Technical Field

[0001] This application relates to the technical field of program control, and particularly to a gas storage control method and system. Background Art

[0002] As a clean and efficient energy source, hydrogen has broad application prospects in the transportation field. Hydrogen fuel cell vehicles use hydrogen as fuel, generate electric energy through hydrogen-oxygen reaction, drive the motor to work, and realize the operation of the vehicle.

[0003] However, to achieve the large-scale application of hydrogen fuel cell vehicles, key issues such as on-vehicle hydrogen storage and hydrogen supply at hydrogen refueling stations must be solved. Currently, hydrogen refueling stations usually adopt high-pressure gas storage technology, and use gas cylinders with different pressure levels to replenish the on-vehicle hydrogen storage cylinders. In the existing gas storage control methods for hydrogen refueling stations, generally, low-pressure, medium-pressure, and high-pressure gas cylinders are used to inflate the on-vehicle gas cylinders in sequence. When the air pressure in the on-vehicle gas cylinder is balanced with the air pressure in the current inflating gas cylinder, or when the air pressure in the on-vehicle gas cylinder reaches the switching threshold of the gas cylinder, the system will switch to the next-level gas cylinder to continue inflating. At the same time, the air compressors in the hydrogen refueling station will replenish the high-pressure, medium-pressure, and low-pressure gas cylinders in sequence to maintain the pressure levels in each gas cylinder.

[0004] The prior art fails to consider a problem. In the scenario of continuous vehicle queuing for hydrogen refueling, there is a technical problem with this traditional gas storage control method. Since the medium-pressure gas cylinder has not been replenished in time after the previous vehicle uses it, the on-vehicle gas cylinder of the next vehicle will reach pressure balance with the medium-pressure gas cylinder at a relatively fast speed and still at a relatively low pressure. When it is necessary to switch to the high-pressure gas cylinder for inflation, since the air compressor has been replenishing the high-pressure gas cylinder, and the medium-pressure gas cylinder has experienced a continuous process of discharging gas to the on-vehicle gas cylinder, its pressure continuously drops, resulting in a large pressure difference between the medium-pressure gas cylinder and the high-pressure gas cylinder. If the inflating gas cylinder is directly switched in this state, the large pressure difference will cause a water hammer effect, resulting in the shaking of the inflating gun, causing wear of the inflating gun interface, and even possibly causing the accidental detachment of the inflating gun from the on-vehicle gas cylinder, leading to safety accidents. Summary of the Invention

[0005] To solve the above technical problems or at least partially solve the above technical problems, this application provides a gas storage control method and system, which can store hydrogen in the on-vehicle gas cylinder more safely.

[0006] In the first aspect, this application provides a gas storage control method, including: sequentially using a low-pressure gas cylinder, a medium-pressure gas cylinder, and a high-pressure gas cylinder to replenish the on-vehicle gas cylinder;

[0007] When the air pressure in the on-vehicle gas tank is balanced with the air pressure in the gas tank for inflating the on-vehicle gas tank or when the air pressure in the on-vehicle gas tank reaches the switching threshold of the gas tank, switch to a gas tank with a higher air pressure to supplement the on-vehicle gas tank with gas;

[0008] The hydrogen storage chamber sequentially uses an air compressor to supplement the high-pressure gas tank, the medium-pressure gas tank, and the low-pressure gas tank with gas;

[0009] It further includes the following steps:

[0010] When the air pressure in the on-vehicle gas tank is balanced with the air pressure in the medium-pressure gas tank, obtain the first air pressure, and the first air pressure is the current air pressure of the medium-pressure gas tank;

[0011] At the same time, obtain the current air pressure of the high-pressure gas tank and set it as the second air pressure;

[0012] According to the air pressure difference between the first air pressure and the second air pressure, calculate the risk value of the medium-pressure gas tank switching to the high-pressure gas tank through a preset risk value calculation function. If the risk value is greater than the preset risk threshold, perform the following steps:

[0013] Stop the hydrogen storage chamber from using the air compressor to boost the pressure of the high-pressure gas tank, and make the hydrogen storage chamber use the air compressor to boost the pressure of the medium-pressure gas tank until the air pressure in the medium-pressure gas tank reaches the medium-pressure switching threshold, and then trigger the medium-pressure gas tank to switch to the high-pressure gas tank to supplement the on-vehicle gas tank with gas, so as to reduce the risk value of the subsequent vehicle switching from the medium-pressure gas tank to the high-pressure gas tank, and then make the hydrogen storage chamber continue to boost the pressure of the high-pressure gas tank.

[0014] Optionally, the gas storage control method further includes the following steps:

[0015] Set the medium-pressure switching threshold of the medium-pressure gas tank as the medium-pressure dynamic switching threshold;

[0016] The medium-pressure dynamic switching threshold is determined through the following steps:

[0017] Every time a predetermined time step is elapsed, obtain the total time consumed by the hydrogen storage chamber using the air compressor to boost the pressure of the medium-pressure gas tank, set it as the first time, and recalculate the risk value of the medium-pressure gas tank switching to the high-pressure gas tank and set it as the first risk value;

[0018] Obtain the air pressure of the medium-pressure gas tank in a preset sliding time window to obtain the gas change trend of the medium-pressure gas tank;

[0019] Input the first risk value, the first time, and the gas change trend of the medium-pressure gas tank into the medium-pressure dynamic switching threshold determination function to adjust the medium-pressure switching threshold to obtain the medium-pressure dynamic switching threshold, so that when the first time is less than the preset time tolerance value, gas can be supplemented to the medium-pressure gas tank as much as possible, and when the first time is greater than the preset time tolerance value, the medium-pressure gas tank can be switched to the high-pressure gas tank to supplement the on-vehicle gas tank with gas as soon as possible while ensuring safety.

[0020] Optionally, the medium-pressure dynamic switching threshold determination function is as follows:

[0021]

[0022] Where is the medium-pressure dynamic switching threshold, is the preset fixed medium-pressure switching threshold, is the first risk value, is the preset risk threshold, T(t) is the first time, is the preset time tolerance value, is the air pressure of the medium-pressure gas tank at time point t, is the length of the preset sliding time window, is the preset minimum allowable medium-pressure switching threshold, and are preset empirical coefficients;

[0023] Where > .

[0024] In a second aspect, the present application provides a gas storage control system, including a processor and a memory. At least one instruction, at least one program, a code set or an instruction set is stored in the memory, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement the gas storage control method according to any one of the first aspects.

[0025] The technical solution provided by the present application has the following advantages compared with the prior art:

[0026] One of its beneficial effects is that, first, in the process of sequentially refilling the vehicle-mounted gas tank with low-pressure, medium-pressure, and high-pressure gas tanks, the present application introduces a risk assessment link. Specifically, when the air pressures of the vehicle-mounted gas tank and the medium-pressure gas tank reach equilibrium, the method of the present application will obtain the air pressure of the medium-pressure gas tank at this time as the first air pressure, and at the same time obtain the current air pressure of the high-pressure gas tank as the second air pressure. Then, through a preset risk value calculation function, the risk value of switching the medium-pressure gas tank to the high-pressure gas tank is calculated based on the pressure difference between the first air pressure and the second air pressure.

[0027] If the calculated risk value exceeds the risk threshold, the method of this application will initiate a pressure regulation process. Specifically, it will suspend the pressurization of the high-pressure gas cylinder and instead use the air compressor to pressurize the medium-pressure gas cylinder until the air pressure in the medium-pressure gas cylinder reaches a specific medium-pressure switching threshold. At this stage, the purpose of the method is to specifically narrow the pressure difference between the medium-pressure gas cylinder and the high-pressure gas cylinder by increasing the air pressure in the medium-pressure gas cylinder, so as to reduce the risk value to a controllable range. Only after ensuring safety will the system restart the switching from the medium-pressure gas cylinder to the high-pressure gas cylinder and resume the gas replenishment to the high-pressure gas cylinder. Therefore, this application can avoid the jitter of the filling gun caused by the excessive pressure difference between the medium-pressure gas cylinder and the high-pressure gas cylinder when multiple vehicles queue up for hydrogen refueling, thus enabling safer hydrogen storage in the vehicle-mounted gas cylinder.

[0028] Moreover, in the case of multiple vehicles queuing up waiting for hydrogen refueling, the control strategy of this application can improve the refueling experience of subsequent vehicles and the overall efficiency of the system by regulating the refueling process of the current vehicle. This is mainly due to the introduction of a key medium-pressure gas cylinder reset mechanism in this application.

[0029] Specifically, when it is detected during the refueling process of the current vehicle that the pressure difference between the medium-pressure gas cylinder and the high-pressure gas cylinder is too large and a risk warning is triggered, the method of this application will suspend the pressurization of the high-pressure gas cylinder and instead use the air compressor in the hydrogen storage chamber to pressurize the medium-pressure gas cylinder. This pressurization process will continue until the air pressure in the medium-pressure gas cylinder reaches a medium-pressure switching threshold. At this stage, the system actually takes advantage of this risk regulation opportunity to reset the air pressure of the medium-pressure gas cylinder.

[0030] Although this reset operation may slightly extend the refueling time of the first vehicle, it significantly improves the refueling safety and efficiency of subsequent vehicles. By raising the air pressure of the medium-pressure gas cylinder to the switching threshold, the method of this application substantially reduces the pressure difference between the medium-pressure gas cylinder and the high-pressure gas cylinder, bringing it back to a relatively safe level. This means that after the current vehicle finishes refueling, subsequent vehicles are very likely not to encounter the problem of excessive pressure difference and risk value exceeding the standard again when switching to fill the high-pressure gas cylinder.

[0031] The method provided by this application optimizes the gas storage method from a global perspective. It does not view the refueling process of each vehicle in isolation, but optimizes the entire queuing scenario as a system. By seizing the opportunity of risk regulation to regulate and reset the system state, the method of this application achieves the effect that the vehicle in front is treated and the vehicle behind benefits. This effect not only ensures the refueling safety of each vehicle, but also improves the operation efficiency of the entire hydrogen refueling station by reducing the occurrence frequency of risk events.

[0032] The second beneficial effect is that the medium-pressure switching threshold should not be set as a fixed value. If this fixed threshold is set too high, when encountering a vehicle with a large on-vehicle gas cylinder capacity, it will take a longer time to fill the medium-pressure gas cylinder to the switching threshold. During this period, even if the condition for switching to the high-pressure gas cylinder for rapid inflation has been met, the system cannot switch in time, resulting in a still not-fast-enough filling speed for the current vehicle. On the contrary, if the fixed threshold is set too low, although the medium-pressure gas cylinder can be switched to the high-pressure gas cylinder in time, when inflating the next vehicle, due to the relatively low pressure level in the medium-pressure gas cylinder, it is very likely to trigger a risk warning again. This requires the system to repeatedly execute the pressure-regulating steps for risk avoidance and cannot directly achieve the switch from medium pressure to high pressure according to the normal process. Such frequent risk events and pressure-regulating operations will not only prolong the filling time of a single vehicle but also reduce the operating efficiency of the entire hydrogen refueling station.

[0033] To address the above problems, the present application adopts a strategy of optimizing the dynamic threshold. This strategy calculates a medium-pressure dynamic switching threshold in real time based on parameters such as the first risk value, the first time, and the gas change trend of the medium-pressure gas cylinder. When the system determines that the risk is controllable and there is still room for improvement, the dynamic threshold will be appropriately increased to extend the medium-pressure inflation time and improve gas utilization efficiency; when the system detects that the inflation time is too long, while ensuring safety, the dynamic threshold will be lowered to ensure a safe and efficient switch to the high-pressure inflation stage.

[0034] Through this dynamic adjustment mechanism, the control strategy of the present application overcomes the defects of the fixed threshold. It enables the system to autonomously optimize control decisions according to the actual situation and seek the best balance between safety and efficiency. On the one hand, the increase in the dynamic threshold can maximize the reset of the medium-pressure gas cylinder and improve the overall efficiency; on the other hand, the decrease in the dynamic threshold can, when the risk is effectively controlled, quickly increase the inflation speed of the current vehicle.

[0035] The third beneficial effect is that the present application proposes a function for determining the medium-pressure dynamic threshold. This function realizes the dynamic optimization of the medium-pressure switching threshold through the following mechanism:

[0036] First, the function introduces the concept of a risk threshold. When the real-time risk value exceeds the risk threshold, the system will prohibit adjusting the switching threshold of the medium-pressure gas cylinder. This hard constraint ensures that in high-risk situations, it can avoid the problem of the inflation gun jitter caused by the medium-pressure gas cylinder still switching to the high-pressure gas cylinder under a large pressure difference due to the decrease in the switching threshold of the medium-pressure gas cylinder.

[0037] Second, the function quantifies the time cost of the pressurization process through a time integral term. When the actual pressurization time exceeds the preset time tolerance value, the function will apply a negative adjustment to the switching threshold to lower the switching threshold of the medium-pressure gas cylinder and prompt a switch to the high-pressure gas cylinder to inflate the on-vehicle gas cylinder as soon as possible.

[0038] Thirdly, the function sets an integral term of the pressure change rate to dynamically evaluate the saturation state of the medium-pressure gas tank. Specifically, when the pressure of the medium-pressure gas tank rises over time and the pressure change rate remains at a relatively large positive value, it indicates that the charging efficiency of the gas tank is relatively high at this time and there is still room for further charging. In this case, multiplying the pressure change rate by the weight coefficient and adding it to the switching threshold can appropriately increase the switching threshold and extend the charging time to the medium-pressure gas tank, so as to charge as much gas as possible into the medium-pressure gas tank to reduce the possibility of a risk alarm still occurring in the next vehicle;

[0039] When the rising speed of the pressure of the medium-pressure gas tank gradually slows down over time and the absolute value of the pressure change rate gradually decreases and approaches zero, it indicates that the boosting pressure of the booster gradually balances with the pressure in the medium-pressure gas tank, and the charging efficiency will decrease significantly if continued. If the switching threshold is not reduced at this time but the medium-pressure charging time is continued instead, it will blindly lengthen the vehicle refueling time and affect the overall efficiency. However, through the medium-pressure dynamic threshold switching function provided in this application, this situation can be recognized because this integral term will give a relatively small threshold correction amount at this time, making the rising amplitude of the switching threshold decrease or even stop, so as to timely minimize the contribution of the integral term and make the switching threshold quickly drop, so as to get out of the low-efficiency state as soon as possible and switch to the high-pressure gas tank to charge the vehicle-mounted gas tank faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic flowchart of the gas storage control method provided by the embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The following will describe the technical solutions in this application in conjunction with the drawings.

[0042] Many specific details are set forth in the following description in order to provide a thorough understanding of this application, but this application may be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of this application, rather than all of the embodiments. It should be noted that, without conflict, the embodiments of this application and the features in the embodiments may be combined with each other.

[0043] In the first aspect, this application provides a gas storage control method, including: sequentially using a low-pressure gas tank, a medium-pressure gas tank, and a high-pressure gas tank to supplement gas to the vehicle-mounted gas tank;

[0044] When the pressure in the vehicle-mounted gas tank is balanced with the pressure in the gas tank used to charge the vehicle-mounted gas tank or the pressure in the vehicle-mounted gas tank reaches the switching threshold of this gas tank, switch to a gas tank with a higher pressure to supplement gas to the vehicle-mounted gas tank;

[0045] The hydrogen storage chamber sequentially uses an air compressor to supplement gas to the high-pressure gas tank, the medium-pressure gas tank, and the low-pressure gas tank.

[0046] It further includes the following steps:

[0047] S101: When the air pressures of the vehicle-mounted gas tank and the medium-pressure gas tank are balanced, obtain the first air pressure, where the first air pressure is the current air pressure of the medium-pressure gas tank;

[0048] Meanwhile, obtain the current air pressure of the high-pressure gas tank and set it as the second air pressure.

[0049] Specifically, the first air pressure and the second air pressure used in this embodiment can be directly retrieved from the inflation management system, and the data of the inflation management system is obtained through sensors.

[0050] S102: According to the air pressure difference between the first air pressure and the second air pressure, calculate the risk value of switching the medium-pressure gas tank to the high-pressure gas tank through a preset risk value calculation function.

[0051] Specifically, the preset risk value calculation function is:

[0052]

[0053] Where, is the artificially preset differential pressure sensitivity coefficient, is the first air pressure, is the second air pressure, is the artificially preset differential pressure safety threshold.

[0054] The risk value calculation function is not limited to the risk value calculation function provided in the embodiment of the present application. As long as its setting rule satisfies the rule that the greater the air pressure difference between the first air pressure and the second air pressure, the higher the risk value, and the appropriate risk threshold is set for the formula.

[0055] S103: If the risk value is greater than the preset risk threshold, then perform the following steps:

[0056] Stop the hydrogen storage chamber from using the air compressor to boost the high-pressure gas tank, and make the hydrogen storage chamber use the air compressor to boost the medium-pressure gas tank until the air pressure in the medium-pressure gas tank reaches the medium-pressure switching threshold, and then trigger the medium-pressure gas tank to switch to the high-pressure gas tank to supplement gas to the vehicle-mounted gas tank to reduce the risk value of the subsequent vehicle switching from the medium-pressure gas tank to the high-pressure gas tank, and then make the hydrogen storage chamber continue to boost the high-pressure gas tank.

[0057] Specifically, in the embodiment of the present application, the gas storage control method further includes the following steps:

[0058] Set the medium-pressure switching threshold of the medium-pressure gas tank as the medium-pressure dynamic switching threshold;

[0059] The medium voltage dynamic switching threshold is determined by the following steps:

[0060] At every predetermined time step, the total time taken by the hydrogen storage chamber to pressurize the medium-pressure gas tank using the air compressor is obtained, which is set as the first time, and the risk value of switching from the medium-pressure gas tank to the high-pressure gas tank is recalculated and set as the first risk value;

[0061] The predetermined time step is 1-10S.

[0062] Obtain the gas pressure of the medium-pressure gas tank in a preset sliding time window to obtain the gas change trend of the medium-pressure gas tank, that is, a matrix composed of data of the preset sliding time window;

[0063] The length of the sliding time window is generally 5, and it generally needs to be associated with a predetermined time step. If the predetermined time step is 1, that is, the length of the preset sliding time window is 5 seconds, the data therein is the air pressure of the medium-pressure gas tank every second.

[0064] The first risk value, the first time and the gas change trend of the medium-pressure gas tank are input into the medium-pressure dynamic switching threshold determination function to adjust the medium-pressure switching threshold to obtain the medium-pressure dynamic switching threshold, so that when the first time is less than the preset time tolerance value, the medium-pressure gas tank can be replenished with gas as much as possible, and when the first time is greater than the preset time tolerance value, the medium-pressure gas tank can be switched to the high-pressure gas tank as soon as possible to replenish the vehicle-mounted gas tank while ensuring safety.

[0065] Specifically, the preset time tolerance is a manually set value that represents the longest acceptable boost time. If this tolerance is exceeded for the first time, the system will tend to lower the switching threshold of the medium-pressure gas tank to speed up the process of switching to the high-pressure gas tank.

[0066] Specifically, the medium voltage dynamic switching threshold determination function is:

[0067]

[0068] in, is the medium voltage dynamic switching threshold, A fixed threshold for switching to medium voltage is preset, is the first risk value, is the preset risk threshold, T(t) is the first time, is the preset time tolerance value, is the gas pressure of the medium pressure gas tank at time t, is the length of the preset sliding time window, is the preset minimum permissible medium voltage switching threshold, and is the preset empirical coefficient;

[0069] in, > .

[0070] Specifically, the fixed threshold for medium pressure switching is generally obtained under ideal conditions without adjustment, at which the medium pressure tank switches to the critical pressure point of the high pressure tank. This value needs to be determined by human beings taking into account the design pressure and safety margin of the current medium pressure tank and high pressure tank. The risk threshold is a manually preset value. The air pressure of the medium pressure tank at time point t can also be directly read from the inflation management system. The preset minimum allowable medium pressure switching threshold is generally taken as The percentage value, in the embodiment of the present application, is 0.8 .

[0071] In summary, the working principle and beneficial effects of this application are discussed as follows:

[0072] One of its beneficial effects is that, first, the present application introduces a risk assessment link in the process of replenishing the on-board gas tank with low-pressure, medium-pressure, and high-pressure gas tanks in sequence. Specifically, when the air pressure of the on-board gas tank and the medium-pressure gas tank reaches equilibrium, the method of the present application will obtain the air pressure of the medium-pressure gas tank at this time as the first air pressure, and at the same time obtain the current air pressure of the high-pressure gas tank as the second air pressure. Then, through a preset risk value calculation function, the risk value of switching from the medium-pressure gas tank to the high-pressure gas tank is calculated based on the pressure difference between the first air pressure and the second air pressure.

[0073] If the calculated risk value exceeds the risk threshold, the method of the present application will start a pressure regulation process. The specific approach is to suspend the pressurization of the high-pressure gas tank and instead use the air compressor to pressurize the medium-pressure gas tank until the air pressure in the medium-pressure gas tank reaches a specific medium-pressure switching threshold. At this stage, the purpose of the method is to increase the air pressure of the medium-pressure gas tank and specifically reduce the pressure difference between it and the high-pressure gas tank, thereby reducing the risk value to a controllable range. Only after confirming safety will the system restart the switch from the medium-pressure gas tank to the high-pressure gas tank and resume the gas replenishment of the high-pressure gas tank. Therefore, the present application can avoid the shaking of the filling gun due to the excessive pressure difference between the medium-pressure gas tank and the high-pressure gas tank when multiple vehicles are queuing for hydrogen refueling, thereby enabling safer storage of hydrogen in the on-board gas tank.

[0074] Furthermore, when multiple vehicles are waiting in line for hydrogen refueling, the control strategy of this application can improve the refueling experience of subsequent vehicles and the overall efficiency of the system by regulating the refueling process of the current vehicle. This is mainly due to the introduction of a key medium-pressure gas tank reset mechanism in this application.

[0075] Specifically, when a large pressure difference between the medium-pressure gas tank and the high-pressure gas tank is detected during the refueling process of the current vehicle and a risk warning is triggered, the method of this application will suspend the pressurization of the high-pressure gas tank and instead use the air compressor in the hydrogen storage chamber to pressurize the medium-pressure gas tank. This pressurization process will continue until the air pressure in the medium-pressure gas tank reaches a medium-pressure switching threshold. At this stage, the system actually takes advantage of this risk regulation opportunity to reset the air pressure level of the medium-pressure gas tank.

[0076] Although this reset operation may slightly extend the refueling time of the first vehicle, it significantly improves the refueling safety and efficiency of subsequent vehicles. By raising the air pressure of the medium-pressure gas tank to the switching threshold, the method of this application substantially reduces the pressure difference between the medium-pressure gas tank and the high-pressure gas tank, bringing it back to a relatively safe level. This means that after the current vehicle is refueled, subsequent vehicles are very likely not to encounter the problem of excessive pressure difference and risk value exceeding the standard again when switching to filling the high-pressure gas tank.

[0077] The method provided by this application optimizes the gas storage method from a global perspective. It does not view the refueling process of each vehicle in isolation, but optimizes the entire queuing scenario as a system. By seizing the opportunity of risk regulation to regulate and reset the system state, the method of this application achieves the effect that the previous vehicle is treated and the subsequent vehicle benefits. This effect not only ensures the refueling safety of each vehicle, but also improves the operation efficiency of the entire hydrogen refueling station by reducing the occurrence frequency of risk events.

[0078] The second beneficial effect is that the medium-pressure switching threshold should not be set as a fixed value. If this fixed threshold is set too high, when encountering a vehicle with a large on-vehicle gas tank capacity, it will take a longer time to fill the medium-pressure gas tank to the switching threshold. During this period, even if the condition for switching to the high-pressure gas tank for rapid filling is already met, the system cannot switch in time, resulting in the refueling speed of the current vehicle still not being fast enough. On the contrary, if the fixed threshold is set too low, although the medium-pressure gas tank can be switched to the high-pressure gas tank in time, when filling the next vehicle, due to the low air pressure level of the medium-pressure gas tank, it is very likely to trigger a risk warning again. This requires the system to repeatedly execute the pressure regulation steps for risk avoidance and cannot directly achieve the switching from medium pressure to high pressure according to the normal process. Such frequent risk events and pressure regulation operations will not only extend the refueling time of a single vehicle, but also reduce the operation efficiency of the entire hydrogen refueling station.

[0079] To address the above problems, this application adopts a strategy for optimizing dynamic thresholds. This strategy calculates a medium-pressure dynamic switching threshold in real time based on parameters such as the first risk value, the first time, and the gas change trend in the medium-pressure gas tank. When the system determines that the risk is controllable and there is room for improvement, the dynamic threshold will be appropriately increased to extend the medium-pressure inflation time and improve gas utilization efficiency; when the system detects that the inflation time is too long, the dynamic threshold will be lowered while ensuring safety to ensure a safe and efficient switch to the high-pressure inflation stage.

[0080] Through this dynamic adjustment mechanism, the control strategy of this application overcomes the defects of fixed thresholds. It enables the system to autonomously optimize control decisions according to the actual situation and seek the best balance between safety and efficiency. On the one hand, the increase in the dynamic threshold can maximize the reset of the medium-pressure gas tank and improve the overall efficiency; on the other hand, the decrease in the dynamic threshold can, when the risk is effectively controlled, increase the inflation speed of the current vehicle as soon as possible.

[0081] The third beneficial effect is that this application proposes a function for determining the medium-pressure dynamic threshold. This function realizes the dynamic optimization of the medium-pressure switching threshold through the following mechanism:

[0082] First, the function introduces the concept of a risk threshold. When the real-time risk value exceeds the risk threshold, the system will prohibit adjusting the switching threshold of the medium-pressure gas tank. This hard constraint ensures that in high-risk situations, it avoids problems such as the inflation gun jitter caused by the medium-pressure gas tank still switching to the high-pressure gas tank under a large pressure difference due to the decrease in the switching threshold of the medium-pressure gas tank.

[0083] Second, the function quantifies the time cost of the pressurization process through a time integral term. When the actual pressurization time exceeds the preset time tolerance value, the function will apply a negative adjustment to the switching threshold to lower the switching threshold of the medium-pressure gas tank and prompt a switch to the high-pressure gas tank as soon as possible to inflate the on-vehicle gas tank.

[0084] Third, the function sets an integral term of the pressure change rate to dynamically evaluate the saturation state of the medium-pressure gas tank. Specifically, when the pressure of the medium-pressure gas tank rises over time and the pressure change rate remains at a relatively large positive value, it indicates that the inflation efficiency of the gas tank is relatively high at this time and there is still room for further inflation. In this case, multiplying the pressure change rate by a weight coefficient and adding it to the switching threshold can appropriately increase the switching threshold and extend the inflation time to the medium-pressure gas tank to inflate as much gas as possible into the medium-pressure gas tank to reduce the possibility of a risk alarm still occurring for the next vehicle;

[0085] When the rising speed of the pressure of the medium-pressure gas tank gradually slows down over time and the pressure change rate When the absolute value gradually decreases and approaches zero, it indicates that the boosting pressure of the booster gradually balances with the pressure in the medium-pressure gas tank, and the efficiency of continuous inflation will significantly decrease. If the switching threshold is not lowered at this time, but instead the medium-pressure inflation time is continuously extended, it will blindly lengthen the vehicle refueling time and affect the overall efficiency. However, through the medium-pressure dynamic threshold switching function provided in this application, this situation can be recognized because the integral term will give a relatively small threshold correction amount at this time, causing the rising amplitude of the switching threshold to decrease or even stop, and timely minimizing the contribution of the integral term, so that the switching threshold quickly drops back to get out of the low-efficiency state as soon as possible, and thus switch to the high-pressure gas tank to inflate the vehicle gas tank faster.

[0086] A gas storage control system includes a processor and a memory. At least one instruction, at least one program, a code set or an instruction set is stored in the memory, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement the gas storage control method as described in any one of the above embodiments.

[0087] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Additionally, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element. Moreover, in the description of the embodiments of this application, unless otherwise specified, " / " means "or". For example, A / B can represent A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. And, in the description of the embodiments of this application, "multiple" means two or more than two.

[0088] The above are only specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to the embodiments described herein, but rather will conform to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas storage control method comprising: Use low-pressure gas tanks, medium-pressure gas tanks and high-pressure gas tanks in sequence to refill the vehicle's gas tank; When the air pressure in the vehicle gas tank is balanced with the air pressure in the gas tank that is used to fill the vehicle gas tank, or when the air pressure in the vehicle gas tank reaches the switching threshold of the gas tank, the vehicle gas tank is replenished with air by switching to a gas tank with a higher air pressure; The hydrogen storage room uses air compressors to replenish high-pressure gas tanks, medium-pressure gas tanks and low-pressure gas tanks in turn; It is characterized in that it also includes the following steps: When the air pressure of the vehicle-mounted gas tank and the medium-pressure gas tank is balanced, obtaining a first air pressure, where the first air pressure is the current air pressure of the medium-pressure gas tank; At the same time, obtain the current air pressure of the high-pressure gas tank and set it as the second air pressure; Based on the pressure difference between the first and second air pressures, a risk value of switching from the medium-pressure gas tank to the high-pressure gas tank is calculated using a preset risk value calculation function. If the risk value is greater than a preset risk threshold, the following steps are performed: Stop the hydrogen storage chamber from using the air compressor to pressurize the high-pressure gas tank, and use the air compressor to pressurize the medium-pressure gas tank until the gas pressure in the medium-pressure gas tank reaches the medium-pressure switching threshold. Then trigger the medium-pressure gas tank to switch to the high-pressure gas tank to replenish gas to the vehicle gas tank, so as to reduce the risk value of subsequent vehicles switching from the medium-pressure gas tank to the high-pressure gas tank. Then, the hydrogen storage chamber continues to pressurize the high-pressure gas tank. The risk value calculation function setting rule satisfies the rule that the greater the pressure difference between the first air pressure and the second air pressure, the higher the risk value; The gas storage control method further comprises the following steps: The medium pressure switching threshold of the medium pressure gas tank is set as the medium pressure dynamic switching threshold; The medium voltage dynamic switching threshold is determined by the following steps: At every predetermined time step, the total time taken by the hydrogen storage chamber to pressurize the medium-pressure gas tank using the air compressor is obtained, which is set as the first time, and the risk value of switching from the medium-pressure gas tank to the high-pressure gas tank is recalculated and set as the first risk value; Obtain the gas pressure of the medium-pressure gas tank within a preset sliding time window to obtain the gas change trend of the medium-pressure gas tank; The first risk value, the first time, and the gas change trend of the medium-pressure gas tank are input into the medium-pressure dynamic switching threshold determination function to adjust the medium-pressure switching threshold to obtain the medium-pressure dynamic switching threshold, so that when the first time is less than the preset time tolerance value, gas can be replenished to the medium-pressure gas tank as much as possible, and when the first time is greater than the preset time tolerance value, gas can be switched from the medium-pressure gas tank to the high-pressure gas tank as quickly as possible to replenish the on-board gas tank while ensuring safety; The medium voltage dynamic switching threshold determination function is: in, is the medium voltage dynamic switching threshold, A fixed threshold for switching to medium voltage is preset, is the first risk value, is the preset risk threshold, T(t) is the first time, is the preset time tolerance value, is the gas pressure of the medium pressure gas tank at time t, is the length of the preset sliding time window, is the preset minimum permissible medium voltage switching threshold, and is the preset empirical coefficient; in, > .

2. Gas storage control system, characterized in that, It includes a processor and a memory, wherein the memory stores at least one instruction, at least one program, code set or instruction set, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by the processor to implement the gas storage control method as described in claim 1.

Images