FLUID STORAGE SYSTEM AND METHOD FOR CLEANING VALVES

Abstract

The present development relates to a fluid storage system (10) for a fuel, comprising: - a first fluid tank (20) which can be filled with the pressurised fuel and which is connected to a first fluid outlet (23) via a first electrically controllable valve (22) in a fluid-transmitting manner, wherein the first valve (22) is electrically controllable for regulating a fluid flow in the first fluid outlet (23), - a second fluid tank (30) which can be filled with the pressurised fuel and which is connected to a second fluid outlet (33) via a second electrically controllable valve (32) in a fluid-transmitting manner, wherein the second valve (32) is electrically controllable for regulating a fluid flow in the second fluid outlet (33), - wherein the first fluid outlet (23) and the second fluid outlet (33) open into a collecting line (15) from which a fluid supply (16) for a fuel-consuming unit (5) branches off, - an electronic control (50) which is signal-coupled to the first valve (22) and to the second valve (32) and is designed to throttle or increase a fluid flow through the second valve (32) over a predetermined time interval in order to clean the first valve (22) and while maintaining a fluid flow through the fluid supply (16) to the fuel-consuming unit (5).

Description

Technical area

[0001] The present development relates to a fluid storage system for a liquid or gaseous fuel and a method for cleaning valves of such a fluid storage system. Furthermore, the present development relates to a motor vehicle equipped with a fuel cell and a fluid storage system. background

[0002] Fluid storage systems are known in various forms from the prior art. In these systems, a fluid is stored in a tank and supplied to a consumer, typically a fuel-consuming unit, via a piping system. A valve can be arranged directly on the fluid tank, through which the fluid can be supplied from the tank to the fluid-consuming unit via a fluid outlet. To ensure long and, as far as possible, maintenance-free operation of the fluid storage system, the fluid storage system typically includes several filters through which particles in the fluid can be filtered out.

[0003] In practice, however, it is unavoidable that particles or impurities from the fluid settle on the valve or on a valve seat, which can impair the tightness of the valve.

[0004] Furthermore, WO 2023 / 208440 A1 discloses a method for operating a fluid storage system and an associated fluid storage system. At least one sensor detects an actual pressure of the fluid on a downstream side of a valve unit and compares it with a target pressure range on the downstream side of the valve unit. If an actual pressure outside a target pressure range is detected, a valve cleaning process is performed in a closed functional position of the valve unit, during which the valve unit is moved from the closed functional position to an open functional position and back to the closed functional position.

[0005] In contrast, the present development is based on the task of improving valve cleaning that does not necessarily require sensor detection of an actual pressure downstream of the valve. Furthermore, valve cleaning should be as simple and cost-effective as possible, preferably using existing components of a fluid storage system. Advantageous designs

[0006] The above-described problem is solved with a fluid storage system, a motor vehicle, a method, and a computer program product according to the features of the independent patent claims. Advantageous embodiments are the subject of dependent patent claims.

[0007] In a first aspect, a fluid storage system for a fuel is provided. The fluid storage system comprises a first fluid tank, which is or can be filled with a pressurized fuel and which is fluid-transmittingly connected to a first fluid outlet via a first electrically controllable valve. The first valve is electrically controllable, typically electrically controllable by an electronic controller, to regulate a fluid flow in the first fluid outlet.

[0008] The fluid storage system further comprises a second fluid tank, which is or can be filled with the pressurized fuel and which is fluidly connected to a second fluid outlet via a second electrically controllable valve. The second valve is also electrically controllable to regulate a fluid flow in the second fluid outlet. The first fluid outlet and the second fluid outlet open into a collecting line, from which a fluid supply for a fuel-consuming unit branches off.

[0009] In other words, the first fluid tank and the second fluid tank are connected in parallel via their respective first and second fluid outlets and via the manifold. Each of the two fluid tanks can be used to supply the unit independently of the other fluid tank or operated accordingly.

[0010] The fluid storage system further comprises an electronic controller which is signal-coupled to the first valve and to the second valve and which is further configured to throttle or increase a fluid flow through the second valve over a predetermined time interval in order to clean the first valve and while maintaining a fluid flow through the fluid supply to the fuel-consuming unit.

[0011] In this respect, the fluid storage system is designed to clean the first valve by reducing or increasing the fluid flow through the second valve over a predetermined time interval. The cleaning procedure for the first valve preferably takes place while maintaining the fluid flow through the fluid supply to the fuel-consuming unit. In this way, the first valve can be subjected to a cleaning procedure during continuous operation of the fuel-consuming unit.

[0012] Likewise, the electronic control can also be configured to subject the second valve to a cleaning procedure. The first and second valves can essentially swap roles in this process. The electronic control is then also configured or designed to throttle or increase the fluid flow through the first valve over the specified time interval to clean the second valve while maintaining the fluid flow through the fluid supply.

[0013] The cleaning procedures for the first valve and the second valve should preferably be carried out sequentially.

[0014] The fluid storage system can be implemented, in particular, by modifying the control technology originating from the electronic controller and otherwise relying on an existing fluid storage system architecture. To perform a cleaning procedure for the first valve and / or the second valve, it is only necessary that the fluid outlets downstream of the respective valves and downstream of the corresponding fluid tanks flow into a common manifold.

[0015] A throttling of the fluid flow through the first or the second valve can be compensated by an increase of the fluid flow through the other valve in order to maintain the fluid flow through the fluid supply branching off from the collecting line to the fuel-consuming unit during operation of the unit.

[0016] By throttling the fluid flow through the second valve over a predetermined time interval, the fluid flow is increased to maintain or maintain the fluid flow through the fluid supply in the first valve. Increasing the fluid flow serves to loosen particles and / or contaminants in or on the first valve and to remove such contaminants or particles.

[0017] According to a further embodiment of the fluid storage system, the controller is configured to increase the fluid flow through the first valve for cleaning purposes during a throttling of the fluid flow through the second valve at a predetermined time interval. During normal operation of the fluid storage system and during operation of the fuel-consuming unit, it is typically provided that the volume flows escaping from the first and second fluid tanks are approximately equal, so that both tanks are emptied simultaneously or almost simultaneously in parallel operation.

[0018] In order to increase the fluid flow through the first valve for cleaning purposes while simultaneously maintaining the fluid flow through the downstream fluid supply to the fuel-consuming unit, it is necessary to throttle the fluid flow through the second valve at a predetermined time interval. Conversely, and to clean the second valve, it can be provided to reduce or throttle the fluid flow through the first valve at a predetermined time interval in order to increase the fluid flow through the second valve while maintaining the fluid flow through the fluid supply to the unit.

[0019] According to a further embodiment, the second valve can be completely closed during or at least within the specified time interval to further increase the fluid flow through the first valve. In this respect, for example, for cleaning purposes of the first valve, the fuel-consuming unit can be supplied with fuel exclusively via the first valve and thus from the first fluid tank during the specified time interval.

[0020] For example, if the fluid storage system has only a first fluid tank and a second fluid tank, the volume flow through the first valve can be virtually doubled for cleaning purposes by closing the second valve and maintaining the fluid flow in the fluid supply to the fuel-consuming unit.

[0021] According to a further embodiment, the fluid storage system can also be provided with a third fluid tank, which can be filled with or is filled with the pressurized fuel and which is fluid-transmittingly connected to a third fluid outlet via a third electrically controllable valve. The third valve can also be electrically controlled by the electronic control system to regulate a fluid flow in the third fluid outlet. The third fluid outlet also opens into the collecting line and runs virtually parallel to the first and second fluid outlets.

[0022] In order to increase the fluid flow through the first valve while maintaining the fluid flow through the fluid supply to the fuel-consuming unit, it may even be provided to temporarily transfer the fluid storage system from normal operation to a cleaning mode.

[0023] During normal operation, all valves—i.e., the first, second, and optional third valves—can be opened equally to create approximately equal fluid flows through the first, second, and third fluid outlets. For cleaning purposes, two of the three valves can be closed or throttled simultaneously during the specified time interval, so that, to maintain fluid flow through the fluid supply to the fuel-consuming unit, the fluid flow can be further increased solely or predominantly through the remaining unit-supplying valve.

[0024] With three valves, a total of three times the fluid flow through the valve to be cleaned is possible compared to normal operation. If the fluid storage system even has an additional, such as a fourth, or even a fifth or sixth, fluid tank, only the valve to be cleaned can be open for cleaning purposes, while all other valves in the remaining fluid tanks are closed. In this way, the volume flow through the only open valve to be cleaned can be further increased.

[0025] According to a further embodiment of the fluid storage system, the controller is configured to throttle the fluid flow through the first valve or to close the first valve during the specified time interval. This increases the pressure gradient between the first fluid tank and the manifold. All fluid tanks, in particular the fluid outlets of the respective fluid tanks located downstream of the associated valves, are fluidically connected to one another via the manifold.

[0026] If, for example, the first valve is completely closed during the specified time interval, the fuel flows exclusively from the second fluid tank through the second fluid outlet into the manifold and then via the fluid supply to the fuel-consuming unit. If the first valve is closed for a longer period of time, the pressure in the second fluid tank decreases progressively due to the escaping fluid. This also has a corresponding consequence for the pressure level in the second fluid outlet and the manifold connected to it.

[0027] In this respect, closing the first valve or throttling it for a relatively long period of time can generate a pressure gradient between the first fluid tank and the manifold. This pressure gradient can gradually increase as the valve continues to close.

[0028] According to a further development of this, it is now provided that the control is designed to open the first valve for cleaning purposes after the expiration of the predetermined time interval and by utilizing the increased pressure gradient between the first fluid tank and the collecting line. Due to the pressure gradient between the first fluid tank and the collecting line previously created by closing or throttling the first valve, a subsequent opening of the first valve after the expiration of the predetermined time interval and by utilizing the increased pressure gradient can generate an increased volume flow in the first valve almost abruptly and suddenly, which can cause contaminants or particles to be loosened and carried along in the volume flow.

[0029] After the first valve has been opened after the specified time interval has elapsed and after an increased pressure gradient has been generated between the first fluid tank and the collecting line, a pressure equilibrium can be established between the first fluid tank and the collecting line. It is even conceivable that, due to the increased pressure gradient and the fluidic connection between the first fluid tank and the second fluid tank via the collecting line, fluid will flow out of the first fluid tank and into the second fluid tank. In this respect, a reversal of the fluid flow direction can be realized at the second valve, which may also be advantageous for cleaning the valve.

[0030] According to a further embodiment of the fluid storage system, the specified time interval is greater than one minute, greater than two minutes, greater than three minutes, greater than five minutes, or even greater than 10 minutes. Such comparatively long time intervals allow increased volume flows to be achieved in one or more valves for cleaning purposes over a comparatively long period, deviating from the normal operation of the fluid storage system.

[0031] Furthermore, comparatively long or large time intervals can achieve a comparatively large pressure drop between the first fluid tank and the manifold. At the end of the specified time interval, the pressure drop can be greater than 10 bar, greater than 15 bar, greater than 20 bar, greater than 30 bar, or even greater than 50 bar. For cleaning the first valve by utilizing the increased pressure drop, it is advantageous if the pressure drop is between 30 and 50 bar.

[0032] Finally, according to a further aspect, a motor vehicle with a fuel-consuming unit configured as a fuel cell is provided. The motor vehicle further comprises a previously described fluid storage system, which is connected to the fuel cell in a fluid-transmitting manner, typically to the fluid supply downstream of the fuel cell manifold. Since the motor vehicle has a previously described fluid storage system, all features, properties, and advantages previously described with regard to the fluid storage system apply equally to the motor vehicle; and vice versa.

[0033] According to a further aspect, the present development finally comprises a method for cleaning valves of a fluid storage system. The method comprises the use of a previously described fluid storage system. In this respect, all features, properties, and advantages previously described with regard to the fluid storage system also apply equally to the method; and vice versa.

[0034] The method comprises increasing the fluid flow through the first valve during a predetermined time interval and throttling the fluid flow through the second valve during the predetermined time interval to maintain the fluid flow through the fluid supply. Similarly, or conversely, it is also possible to throttle the fluid flow through the second valve during the predetermined time interval and increase the fluid flow through the first valve during the predetermined time interval to maintain the fluid flow through the fluid supply.

[0035] By increasing the fluid flow through the first valve during the specified time interval, a cleaning effect or cleaning procedure can be performed for the first valve. The second valve can, of course, also be cleaned in the same way. For this purpose, the roles of the first and second valves are essentially reversed. The fluid flow through the second valve is then increased during the specified time interval by throttling the fluid flow through the first valve.

[0036] According to a further aspect, a further method using the previously described fluid storage system is provided. Here, the fluid flow through the first valve is throttled or the first valve is closed during the predetermined time interval. Throttling the fluid flow through the first valve and / or closing the first valve during the predetermined time interval increases a pressure gradient between the first fluid tank and the manifold during the predetermined time interval, since during the first time interval the fuel-consuming unit is supplied with fuel exclusively from the second fluid tank or from optional additional fluid tanks.

[0037] The outflow of fuel from the second and / or additional fluid tanks during the specified time interval leads to a pressure reduction in the second fluid tank and / or in the optional additional fluid tanks, as well as to a pressure reduction in the manifold. During this time, and while the first valve is throttling or closing, the pressure gradient between the first fluid tank and the manifold continues to increase. Then, after the specified time interval has elapsed, the first valve is opened for cleaning purposes, taking advantage of the increased pressure gradient.

[0038] The pressure drop then causes a sudden pressure equalization and a surge of flushing of the first valve with the liquid or gaseous fuel, which allows adhesions or contaminants to be released from the valve and removed.

[0039] Finally, according to a further independent aspect, a computer program product is provided which comprises computer-readable instructions which, when executed by a processor of an electronic controller of a fluid storage system described above, cause the processor to carry out at least one of the methods described above.

[0040] Since the computer program product serves for the computer-implemented execution of one of the previously described methods and for controlling the electronic control of the previously described fluid storage system, all features, advantages and possible applications described previously with regard to the fluid storage system and the method(s) also apply equally to the computer program product; and vice versa. Short description of the characters

[0041] Further objectives, features, and advantageous embodiments of the present development are explained in the following description of an exemplary embodiment. Herein: Fig. 1 a schematic representation of a motor vehicle equipped with a fluid storage system and a fuel cell, Fig. 2 a block diagram of the fluid storage system, Fig. 3 a flow diagram of a process for cleaning valves, Fig. 4 a flow diagram of another method for cleaning valves of a fluid storage system. Detailed description

[0042] The Fig. The motor vehicle 1 shown schematically in Figure 1 comprises a self-supporting vehicle body 2 and an interior 3 functioning as a passenger compartment. The motor vehicle 1 further comprises a drive 4 and a fuel cell 6, which functions as a fuel-consuming unit 5. The vehicle 1 further comprises a fluid storage system 10 for a fuel, such as hydrogen. The fluid storage system 10 is shown in Fig. 2 is shown schematically and in the form of a block diagram. The fluid storage system 10 comprises a first fluid tank 20 and a first electrically controllable valve 22 directly connected thereto.

[0043] The fluid storage system 10 further comprises a second fluid tank 30 and a corresponding second electrically controllable valve 32. Furthermore, the fluid storage system 10 can optionally be equipped with a further, for example, a third fluid tank 40 and a further, for example, a further electrically controllable valve 42. Furthermore, the fluid storage system 10 can also comprise additional fluid tanks 60 or associated electrically controllable valves 62.

[0044] Downstream of the first valve 22, a first fluid outlet 23 is provided, via which the pressurized fuel in the first fluid tank 20 can be fluidly conveyed into a collecting line 15. Likewise, downstream of the second valve 32, a second fluid outlet 33 is fluidly connected to the collecting line 15. In a similar or identical manner, the optional third fluid tank 40 can also be connected to the collecting line 15 via its third valve 42 and a third fluid outlet 43.

[0045] The collecting line 15 is in flow connection with all fluid outlets 23, 33, 43 of the respective fluid tanks 20, 30, 40, or their outlet valves 22, 32, 42. As can be seen in particular from the Fig. As can be seen in Figure 2, the first fluid tank 20, the second fluid tank 30, and the optional third fluid tank 40 are connected in parallel for fluid flow purposes. The corresponding fluid outlets 23, 33, 43 all flow into one and the same collecting line 15.

[0046] A fluid supply 16 for the fuel-consuming unit 5, such as a fuel cell 6, is provided from the manifold 15. The fluid supply 16 can have a pressure reducer 12, so that a constant or approximately constant pressure level can always be set downstream of the pressure reducer 12 and for supplying the fuel-consuming unit 5. By successively or continuously emptying the pressurized fluid tanks 20, 30, 40, 60, the pressure in the corresponding respective fluid outlets 23, 33, 43 as well as in the manifold 15 decreases when the fuel-consuming unit 5 is operated as intended.

[0047] The fluid storage system 10 further includes an electronic controller 50, which is signal-coupled to all valves 22, 32, 42 and is designed to control or regulate a fluid flow through the respective valves 22, 32, 42. The electronic controller 50 can also be signal-coupled or data-coupled to the fuel-consuming unit 5 in order to regulate or control the fuel supply to the unit 5, for example, to the fuel cell 6, as needed.

[0048] The fluid storage system 10 is specifically designed and configured for self-cleaning of individual valves 22, 32, 42. For this purpose, the fluid storage system 10 can be switched or transferred from normal operation to a cleaning mode, for example, by the electronic controller 50. During normal operation of the fluid storage system 10, it is typically provided that all valves 22, 32, 43 are opened at least partially or in a cyclical manner in order to empty the parallel-connected fluid tanks 20, 30, 40 more or less simultaneously. In this way, a constant pressure level can be achieved in the respective fluid outlets 23, 33, 43.

[0049] However, if the fluid storage system is transferred to a cleaning mode, it can be provided that in one valve, namely in the valve to be cleaned, for example in the first valve 22, the fluid flow through the first valve 22 is specifically increased over a predetermined time interval, but that the fluid flow in the fluid supply 16 for the unit 5 is maintained, i.e. left unchanged. In order to increase the fluid flow through the first valve 22, a throttling of the fluid flow by one of the further valves 32 and / or 42 is provided. In order to maximize the fluid flow through the valve to be cleaned, for example through the first valve 22, it can even be provided to interrupt one or even both of the remaining valves 32, 42 at least temporarily or for the entire predetermined time interval, i.e. to close the respective valves 32, 42 completely.In this way, the fluid flow through the first valve 22 can be further maximized while maintaining the fluid flow through the fluid supply 16.

[0050] Likewise, the remaining valves 32, 42 can also be cleaned sequentially or successively. For example, the volume flow through the second valve 32 can be increased by reducing the volume flow through the first valve 22 during the predetermined time interval. The predetermined time interval can be one or more minutes, so that a corresponding cleaning effect can be achieved over a comparatively long period of time. Furthermore, it is conceivable that, in a configuration with at least three fluid tanks, only the valve to be cleaned, such as the first valve 22, is open, while the remaining valves 32, 42 are throttled with regard to their fluid flow or even completely closed.

[0051] This cleaning procedure is also reflected in the flow chart of the Fig. 3. In a first step 100, the fluid storage system is operated in normal mode. Here, an approximately equal fluid flow or volume flow of fuel flows from all fluid tanks 20, 30, 40 towards the unit 5. In step 102, the fluid storage system is switched to a cleaning mode. For this purpose, in step 104, the fluid flow through the second valve 32 and the fluid flow through the third valve 42 are throttled. Likewise and simultaneously, the fluid flow through the first valve 22 is increased in step 104 before the method ends in step 106 after the expiration of the predetermined time interval and the fluid storage system is transferred from the cleaning mode back to normal operation in step 108.

[0052] In the flowchart of the Fig.4 describes a further cleaning procedure. Here, too, in a step 200, the fluid storage system is initially operated in normal mode. In step 202, for example, the valve to be cleaned, for example, the first valve 22, is completely closed. Subsequently, and in step 204, the unit 5 is then supplied with fuel exclusively from the remaining fluid tanks 30, 40 and via the remaining valves 32, 42. By decoupling the first fluid tank 20 from the unit 5 during the predetermined time interval, the remaining tanks 30, 40 are successively emptied, so that the fluid pressure in the collecting line 15 drops accordingly.

[0053] Consequently, in step 206 and during the predetermined time interval, a pressure gradient is established between the pressure inside the first fluid tank 20 and the collecting line 15. Following this and in step 208, the first valve 22 is preferably opened suddenly, so that, by utilizing the increased pressure gradient, the first valve 22 is purged in a quasi-surge manner of the fluid escaping from the first fluid tank 20.

[0054] After this and in step 210, a pressure equilibrium is established between the fluid tanks 20, 30, 40 and in step 212 the fluid storage system can then be returned to normal operation.

[0055] The illustrated embodiments merely show possible configurations of the development, for which numerous further variants are conceivable within the scope of the development. The exemplary embodiments shown are in no way to be interpreted as limiting the scope, applicability, or configuration options of the development. This description merely shows the person skilled in the art one or several possible implementations of an exemplary embodiment. Thus, a wide variety of modifications can be made to the function and arrangement of the described elements without departing from the scope of protection defined by the following claims or their equivalents. List of reference symbols 1 motor vehicle 2 Motor vehicle body 3 Interior 4 Drive 5 aggregate 6 Fuel cell 10 fluid reservoirs 12 pressure reducers 15 Collective line 16 Fluid supply 20 fluid tank 22 Valve 23 Fluid outlet 30 fluid tank 32 valve 33 Fluid outlet 40 fluid tank 42 Valve 43 Fluid outlet 50 Control 60 fluid tank 62 Valve QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] WO 2023 / 208440 A1

[0004]

Claims

[1] A fluid storage system (10) for a fuel, comprising: - a first fluid tank (20) which can be filled with the pressurised fuel and which is connected to a first fluid outlet (23) via a first electrically controllable valve (22) in a fluid-transmitting manner, wherein the first valve (22) is electrically controllable for regulating a fluid flow in the first fluid outlet (23), - a second fluid tank (30) which can be filled with the pressurised fuel and which is connected to a second fluid outlet (33) via a second electrically controllable valve (32) in a fluid-transmitting manner, wherein the second valve (32) is electrically controllable for regulating a fluid flow in the second fluid outlet (33), - wherein the first fluid outlet (23) and the second fluid outlet (33) open into a collecting line (15) from which a fluid supply (16) for a fuel-consuming unit (5) branches off, - an electronic control (50) which is signal-coupled to the first valve (22) and to the second valve (32) and is designed to throttle or increase a fluid flow through the second valve (32) over a predetermined time interval in order to clean the first valve (22) and while maintaining a fluid flow through the fluid supply (16) to the fuel-consuming unit (5). [2] Fluid storage system (10) according to claim 1, wherein the controller (50) is configured to increase the fluid flow through the first valve (22) for cleaning purposes during a throttling of the fluid flow through the second valve (32) in the predetermined time interval. [3] Fluid storage system (10) according to claim 2, wherein the controller (50) is configured to close the second valve (32) at the predetermined time interval to further increase the fluid flow through the first valve (22). [4] Fluid storage system (10) according to one of the preceding claims, wherein the controller (50) is configured to throttle the fluid flow through the first valve (22) or to close the first valve (22) during the predetermined time interval in order to increase a pressure gradient between the first fluid tank (20) and the collecting line (15) during the predetermined time interval. [5] Fluid storage system (10) according to claim 4, wherein the controller (50) is designed to open the first valve (22) after the expiration of the predetermined time interval for cleaning purposes and by utilizing the increased pressure drop. [6] Fluid storage system (10) according to any one of the preceding claims, wherein the predetermined time interval is greater than one minute, greater than two minutes, greater than three minutes, greater than five minutes or greater than 10 minutes. [7] Motor vehicle (1) with a fuel-consuming unit (5) designed as a fuel cell (6) and with a fluid storage system (10) according to one of the preceding claims, which is connected to the fuel cell (5) in a fluid-transmitting manner. [8] A method for cleaning valves (22, 32, 42) of a fluid storage system (10) according to any one of the preceding claims, comprising the steps: - increasing a fluid flow through the first valve (22) during the predetermined time interval and - throttling the fluid flow through the second valve (32) during the predetermined time interval to maintain the fluid flow through the fluid supply (16). [9] A method for cleaning valves (22, 32, 42) of a fluid storage system (10) according to any one of the preceding claims 1 to 6, comprising the steps: - throttling the fluid flow through the first valve (22) or closing the first valve (22) during the predetermined time interval, - increasing a pressure gradient between the first fluid tank (20) and the collecting line (15) during the predetermined time interval, - Opening the first valve (22) for cleaning purposes by utilizing the increased pressure drop after the specified time interval has elapsed. [10] A computer program product comprising computer-readable instructions which, when executed by a processor of an electronic controller (50) of a fluid storage system (10) according to any one of the preceding claims 1 to 6, cause the processor to perform at least one of the methods according to claims 8 or 9.

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