Method for checking the quantity of hydrogen gas released into the vehicle during a refueling process at a hydrogen filling station, and system comprising the vehicle and the hydrogen filling station

Description

[0001] The present invention relates to a method for checking the amount of hydrogen gas delivered to a vehicle during a refueling process at a hydrogen filling station. Furthermore, the invention relates to a system comprising a vehicle and a hydrogen filling station.

[0002] Along with electromobility and the use of electrical energy storage systems, hydrogen is one of the most important energy sources for future individual mobility. Hydrogen filling stations (also known as "H2 filling stations") are planned to refuel hydrogen-powered vehicles, and their gas meters will be required to be calibrated in the future.

[0003] The driver of such a hydrogen-powered vehicle must then rely on the calibrated gas meter at the hydrogen filling station. However, if the gas meter is defective, there is a gas leak, or for other reasons the amount of hydrogen entering the driver's vehicle tank is less than the amount measured by the gas meter, for which they must pay, the driver or customer of the hydrogen filling station has no means of verifying this. They must rely on the information provided by the hydrogen filling station operator.

[0004] Methods for carrying out refueling operations are known from US 2013 / 0146176 A1 and US 2005 / 0247123 A1.

[0005] It is therefore an object of the present invention to at least partially remedy the disadvantages described above. In particular, it is an object of the present invention to provide a means of verifying the amount of hydrogen gas released during the refueling process.

[0006] The above object is achieved by a method having the features of claim 1 and by a system having the features of claim 13. Further features and details of the invention emerge from the respective subclaims, the description, and the drawings. Features and details described in connection with the method according to the invention naturally also apply in connection with the system according to the invention, and vice versa, so that with regard to the disclosure of the individual aspects of the invention, reference is always made to each other.

[0007] The above object is achieved according to a first aspect of the invention by a method for checking the amount of hydrogen gas delivered to a vehicle during a refueling process at a hydrogen filling station. The method comprises the following steps: (a) filling a vehicle tank of the vehicle during the refueling process at the hydrogen refueling station, (b) measuring the amount of hydrogen gas delivered to the vehicle tank during the refueling process by means of a gas meter of the hydrogen refueling station, (c) establishing a communication connection between the hydrogen refueling station and the vehicle or an external device connected to the vehicle, (d) transmitting at least one item of meter information from the gas meter, which contains the amount of hydrogen gas measured by the gas meter, to the vehicle or the external device by means of the communication connection, and (e) determining the amount of hydrogen gas taken up into the vehicle tank during the refueling process.

[0008] The method according to the invention thus provides both the amount of hydrogen gas supposedly released by the hydrogen filling station or measured by the gas meter, as well as the amount of hydrogen gas actually delivered or absorbed into the vehicle tank. The driver of the vehicle or the customer of the hydrogen filling station, or the vehicle or external device, can thus compare or determine whether the amount of hydrogen gas measured by the hydrogen filling station's gas meter corresponds to the amount of hydrogen absorbed.

[0009] In addition, the driver can determine whether they have actually received the amount of hydrogen gas they are paying for or have paid for. Furthermore, if the driver, customer, vehicle, or external device reports the amount of hydrogen gas consumed back to the hydrogen refueling station or its operator, the hydrogen refueling station operator can also verify whether the gas meter is functioning properly or whether there are or have been other problems, such as leaks in the hydrogen refueling station or during refueling, that have caused or are causing a discrepancy.

[0010] The communication connection can be established before filling the vehicle tank, during filling, or after filling the vehicle tank or the refueling process is complete. The amount of hydrogen gas released is measured during the filling process. The meter information can be transmitted after filling the vehicle tank or at intermediate points during the refueling process. The amount of hydrogen gas absorbed into the vehicle tank can also be determined after filling the vehicle tank or at intermediate points during the refueling process.

[0011] The refuelling process may in particular be a refuelling process at a hydrogen filling station initiated by a user, such as the driver of the vehicle.

[0012] The vehicle can be designed as a motor vehicle and / or passenger vehicle and / or truck and / or fuel cell vehicle, which has at least one vehicle tank for hydrogen. This vehicle tank can be filled during the refueling process in accordance with the amount of gas delivered. The hydrogen filling station, i.e. a filling station for refueling such vehicles with hydrogen, can have one or more filling pumps. The energy supply of such vehicles, i.e. mobile hydrogen consumers, in particular fuel cell vehicles, can be replenished using the filling pump. The liquid or compressed gaseous hydrogen can be kept in tanks for the hydrogen filling station. A hydrogen filling station can, for example, have pumps and filling devices for connection to the respective vehicle tanks of the vehicles.

[0013] The gas meter may provide meter information by measuring the gas flow during the refueling process. Since the determination of the gas flow during the refueling process at a hydrogen refueling station may be subject to the Measurement and Calibration Act, increased technical requirements may be placed on this measurement. In other words, to ensure the reliable determination of the gas volume and thus the amount of energy delivered, the hydrogen refueling station may be subject to calibration.

[0014] The meter information can directly display the meter reading of the hydrogen gas quantity measured during the refueling process. The gas meter can then be reset to zero after each refueling process.

[0015] The meter information can also contain an initial meter reading before the start of the refueling process and a current meter reading or an intermediate or final meter reading after the end of the refueling process. In this case, the meter information can contain the measured amount of hydrogen gas in such a way that it can be calculated by subtraction. Either the hydrogen filling station, in particular a control unit of the hydrogen filling station, or the vehicle, in particular a control unit of the vehicle, or the device can be set up accordingly to carry out the subtraction in order to determine the measured amount of hydrogen gas based on the meter readings of the gas meter. In the first case, the meter information therefore directly contains the measured amount of hydrogen gas, and in the second case, the meter information contains the initial meter reading and a current meter reading oran intermediate or final meter reading from which the vehicle or the external device can calculate the measured amount of hydrogen gas.

[0016] The determined amount of hydrogen gas absorbed represents the amount of hydrogen gas actually entered or absorbed into the vehicle tank.

[0017] Accordingly, the amount of hydrogen gas taken up in the vehicle tank during the refueling process is advantageously determined by the vehicle or on the vehicle side.

[0018] This way, external influences on the determination of the amount of gas absorbed can be avoided. This can be done by knowing or determining the amount of gas present in the vehicle tank before refueling. The absorbed amount of hydrogen gas can then be determined by subtracting the total amount of hydrogen gas present in the vehicle tank currently, between, or after refueling from the amount of hydrogen gas present before refueling.

[0019] For this purpose, the vehicle can rely on a measurement of the pressure and temperature in the vehicle tank to determine the amount of hydrogen gas in the vehicle tank. For safety reasons, these values are usually measured and monitored continuously in such vehicles. The thermal equation of state of ideal gases can be used to determine the amount of hydrogen gas in the vehicle tank. The volume of the vehicle tank is known and constant. If the pressure and temperature in the vehicle tank are unknown, an alternative is to use measured values from the hydrogen filling station, which can be transmitted to the vehicle or an external device via the communication connection.

[0020] According to the invention, the method further comprises the step of determining a difference in gas quantity between the released gas quantity of hydrogen and the absorbed gas quantity of hydrogen.

[0021] By means of the difference gas quantity, the extent of a deviation between the amount of hydrogen gas released and the amount of hydrogen gas absorbed can be determined or checked.

[0022] It can be provided that the determination of the differential gas quantity is carried out by a control unit of the vehicle or the external device.

[0023] Accordingly, the determination of the gas difference is automated. The result, i.e., the gas difference, can be displayed to the driver or user of the vehicle, for example, on a display at the hydrogen filling station, on a display in the vehicle, or on a display on an external device. This allows the driver or customer to track the refueling process. Alternatively or additionally, it is conceivable that the driver can also be shown the amount of hydrogen released and the amount of hydrogen absorbed.

[0024] The invention also provides that a message based on the determined difference gas quantity is transmitted to the hydrogen filling station by means of the communication connection.

[0025] This message can be transmitted from the vehicle's control unit or the external device. The message can contain meter information. The meter information can include the gas difference and / or the amount of hydrogen consumed. This provides a simple way to notify the hydrogen filling station and its operator of a possible gas difference. Furthermore, the hydrogen filling station can display the potential gas difference. The operator can then check the hydrogen filling station for errors or problems, for example, by having the gas meter recalibrated prematurely or by having a missed calibration performed.

[0026] In this case, it can be provided that a success message is transmitted to the hydrogen filling station as a message, which indicates to the water filling station that the filling process was error-free if the determined difference gas quantity is zero or does not exceed a predetermined limit, and / or an error message is transmitted to the hydrogen filling station as a message, which indicates to the hydrogen filling station that the filling process was faulty if the determined difference gas quantity exceeds the predetermined limit.

[0027] As an alternative to transmitting a message, it can also be provided that neither a success message nor an error message is transmitted. In this case, a control unit at the hydrogen filling station can determine that the refueling process must have been faulty based on the omitted message. However, this has the disadvantage that the control unit must start a timer for receiving a message. In this way, the hydrogen filling station can be informed very specifically by the vehicle or the external device that the refueling process was successful. In the case of a success message, for example, an invoice or payment request can be created for the driver or user of the vehicle and the driver or user at the hydrogen filling station itself can be informed of the successful refueling process.However, if an error message is transmitted or a success message is not received during the running timer, the invoice creation or payment request can be interrupted or postponed and a solution for the faulty refueling process can be sought for the time being.

[0028] The predetermined limit value can also be referred to as a tolerance value. This results from the typically higher measurement accuracy of the gas meter, especially if it is calibrated, which directly determines the gas flow compared to the method used in the vehicle to determine the gas quantity in the vehicle tank, as well as possible hydrogen diffusion. If no limit value were predetermined, even small differential gas quantities attributable to such tolerance deviations in the measurement method in the vehicle tank would be taken into account, although these cannot be attributed to a faulty gas meter or an overall faulty hydrogen filling station.

[0029] It may be provided that the message is signed by a security feature of the vehicle or the external device.

[0030] For example, this could be a digital signature. The message contains a secret signature key. The hydrogen filling station can verify the authorship and integrity of the message using a public verification key for the secret signature key. It could also be a CRC, RSA, or ECDSA signature, for example. This reliably prevents tampering.

[0031] Furthermore, it can be provided that the method further comprises an electronic payment process for the refueling process at the hydrogen refueling station, wherein a payment is made within the scope of the payment process on the basis of the amount of hydrogen gas taken up in the vehicle tank or on the basis of the amount of hydrogen gas taken up in the vehicle tank and reduced by the predetermined limit value.

[0032] This ensures that the user or customer of the hydrogen filling station actually only pays for the amount of hydrogen dispensed by the hydrogen filling station, and not just the amount measured by the possibly faulty gas meter. The inclusion of the predetermined limit has the advantage that, in principle, the more accurate gas meter is used to determine the relevant gas quantity for payment, unless there is a significant deviation, i.e., one that exceeds the predetermined limit. In this case, the customer is prevented from paying an incorrect price.

[0033] It may also be provided that the meter information is signed by a security feature of the hydrogen filling station, in particular the gas meter.

[0034] For example, this could be a digital signature. The message contains a secret signature key. The vehicle or external device can verify the authorship and integrity of the message using a public verification key for the secret signature key. It could also be a CRC, RSA, or ECDSA signature, for example. This reliably prevents tampering.

[0035] Furthermore, it can be provided that a smartphone or a tablet computer is used as an external device.

[0036] Accordingly, the driver or user of the vehicle can have the refueling process checked using their personal smartphone or tablet computer. This has the advantage that not every vehicle needs the functionality to establish a communication connection with the hydrogen refueling station. It may be more cost-effective to use the driver's or user's personal smartphone or tablet computer, which already has a wireless interface, for example. However, this requires that the smartphone or tablet computer receive information about the amount of hydrogen consumed from the vehicle, particularly its control unit.

[0037] Furthermore, it can be provided that the verification process regarding the refueling process is linked to the payment process. For example, it is known to carry out a payment process using near-field communication. For example, the same near-field communication as the communication link for the payment process can also be used to verify the amount of hydrogen dispensed.

[0038] Alternatively, other common wireless technologies, such as LTE, 5G, Wi-Fi, Bluetooth®, or similar, on a smartphone or tablet computer can be used to establish communication. A corresponding app can be installed on the smartphone or tablet computer to monitor the refueling process. Accordingly, the external device can establish a communication connection to the hydrogen filling station, receive the meter information from the hydrogen filling station, and obtain the amount of hydrogen consumed from the vehicle as information, further comparing it if necessary, determining the difference in gas volume, and / or transmitting one of the previously described messages to the hydrogen filling station.

[0039] It can also be provided that the hydrogen filling station has a control unit connected to the gas meter, wherein the control unit is configured to transmit the at least one piece of meter information.

[0040] This control unit can be the aforementioned control unit of the hydrogen filling station, which is configured to process the message. For this purpose, the control unit can be connected to a second wireless communication device or have a second wireless communication device that performs the actual transmission of the at least one piece of meter information. However, the control unit can initiate the transmission and transmit the corresponding meter information from the gas meter to the second wireless communication device.

[0041] It can be provided that the gas meter and the control unit are arranged in a common measuring capsule.

[0042] This prevents tampering with the control unit. Furthermore, the gas meter can be sealed to prevent software tampering.

[0043] It can also be provided that the vehicle or the external device has a first wireless communication device and the hydrogen filling station has a second wireless communication device for establishing a wireless communication connection.

[0044] Accordingly, the communication connection can advantageously be wireless. Compared to wired communication via an electrical data line, this avoids the potential risk of explosion at the hydrogen filling station. The wireless communication connection can be implemented, for example, using Wi-Fi, Bluetooth ®, LTE, 5G, according to a car-to-car communication standard, or in another similar way.

[0045] Finally, it can also be provided that the method is carried out during the ongoing refueling process for a portion of the total amount of hydrogen gas measured during the refueling process.

[0046] In other words, after a predetermined refueling time, which corresponds to a portion of the total refueling time for the complete refueling process, a check can be made to determine whether the measured hydrogen gas quantity after the predetermined refueling time corresponds to the amount of hydrogen gas absorbed into the vehicle tank. This makes it possible to determine, even before the refueling process is complete, whether the refueling process is proceeding correctly or with errors. In particular, this allows for a continuous or discrete check of the refueling process, i.e., at discrete times.

[0047] According to a second aspect of the invention, the object mentioned at the outset is achieved by a system comprising a vehicle with a vehicle tank for holding hydrogen, optionally an external device and a hydrogen filling station for delivering a quantity of hydrogen gas to the vehicle tank of the vehicle during a filling process and with a gas meter, wherein the system is set up to carry out the method according to the first aspect of the invention.

[0048] Thus, the system according to the second aspect of the invention has the same advantages as described with respect to the method according to the first aspect of the invention. Furthermore, the system can have the features of the method described above, so that repetition of these features is omitted in this regard.

[0049] Further advantages, features, and details of the invention will become apparent from the following description, which describes embodiments of the invention in detail with reference to the drawings. The features mentioned in the claims and in the description may be essential to the invention individually or in any combination, provided these modifications do not exceed the scope of the claims. They show schematically: Fig. 1 shows a representation of a refueling process with a user on a system according to an embodiment of the invention with a hydrogen refueling station, an external device and a vehicle; Fig. 2 shows a schematic representation of the system from Fig. 1 with hydrogen filling station and vehicle; Fig. 3 a schematic representation of the system Fig. 1with hydrogen filling station, external device and vehicle; Fig. 4 a schematic representation of a refueling process with a method for its verification according to an embodiment of the invention in the system of Fig. 1 ; and

[0050] Fig. 5 an example of a pressure curve over time during the refueling process.

[0051] In the following figures, identical reference numerals are used for the same technical features, even in different embodiments.

[0052] Figure 1 shows a system comprising a vehicle 100, a hydrogen filling station 200 and an external device 400 during a refueling process 500 initiated by a user or driver 430 of the vehicle 100.

[0053] The system can comprise the vehicle 100, the hydrogen filling station 200 as well as the external device 400 or use them for the method described below, as in Figure 3shown, but alternatively only have the vehicle 100 and the hydrogen filling station 200 or use it for the method described below, as in Figure 2 is shown.

[0054] While the Figure 1 The refueling process 500 is illustrated by the Figures 2 , 3 , 4 and 5 the refueling process 500 and an inventive embodiment of a method for checking the refueling process 500 purely schematically.

[0055] The vehicle 100 is embodied as a fuel cell vehicle having a vehicle tank 110 for storing hydrogen as an energy source for operating the vehicle 100. In the present case, the vehicle tank 110 comprises two gas cylinders, but can also be configured with only one or more gas cylinders or with one or more other tank containers.

[0056] The vehicle tank 110 is connected to a control unit 120 in the vehicle 100, which in turn is connected to a first wireless communication device 130 in the vehicle 100. The control unit 120 and the first wireless communication device 130 are shown only as examples with regard to their arrangement in the vehicle 100 and their schematic design.

[0057] The hydrogen filling station 200 is shown here with only a single pump, but may also have multiple pumps. The vehicle tank 110 is refueled by the user 430 with hydrogen from the pump of the hydrogen filling station 200. For this purpose, the user 430 has connected the fuel nozzle 270 to the gas hose 260 of the hydrogen filling station 200 in a gas-tight manner to a tank opening of the vehicle tank 110. A meter reading display 280 displays the meter reading of the gas meter 220 or the amount of hydrogen gas measured during the refueling process 500.

[0058] As a result, a quantity of hydrogen gas from the hydrogen filling station 200 is provided in the vehicle tank 110. A gas meter 220 in the hydrogen filling station 200 counts or measures the quantity of hydrogen gas delivered by the hydrogen filling station 200, which is hereinafter referred to as the measured quantity of hydrogen gas.

[0059] User 430 is holding an optional external device 400. This device is a smartphone or tablet computer belonging to user 430. User 430 wants to ensure that he only pays for the amount of hydrogen gas that is actually absorbed into or arrives at his vehicle tank 100.

[0060] Based on Figure 2 and 4 It is explained below how this is ensured on the vehicle side using only the vehicle 100 in conjunction with the hydrogen filling station 200.

[0061] In addition to the gas meter 220, the hydrogen filling station 200 has a hydrogen tank 210, from which the hydrogen is transported to the vehicle tank 110 via the gas hose 260, past the gas meter 220, which measures its gas quantity. The gas meter 220 is calibrated and includes a control unit 230. The gas meter 220 and the control unit 230 are arranged in a common measuring capsule 240. The control unit 230 is further connected to a second wireless communication unit 250 in or on the hydrogen filling station 200.

[0062] A communication connection 300 is established between the hydrogen filling station 200 and the vehicle 100 before, during, or after completion of the refueling process 500 via the second wireless communication unit 250 of the hydrogen filling station 200 and the first wireless communication unit 130 of the vehicle 100. Using this communication connection 300, the vehicle 100 and the hydrogen filling station 200 can exchange information with each other.

[0063] As an alternative to the communication connection 300 between the vehicle 100 and the hydrogen filling station 200, the communication connection 300 in a system with an external device 400 can also be established between the external device 400 and the hydrogen filling station 200, as Figure 3 For this purpose, it is necessary for the external device 400 to communicate wirelessly with the vehicle 100 in order to obtain information from the vehicle 100, in particular the control unit 120.

[0064] For this purpose, the external device 400 itself has a first wireless communication device 410 for direct communication with the second wireless communication device 250 of the hydrogen filling station 200 and communicates wirelessly with the vehicle 100, or, as shown, wirelessly with the first wireless communication device 130 of the vehicle 100 by means of a further communication connection 440. Instead of the control unit 120, the external device 400 has a computing unit 420 that can perform calculations.

[0065] Figure 4 shows schematically the sequence during and after the refueling process 500 according to the method of an embodiment of the invention for the system according to Figure 2 . For the system according to Figure 3 The modification of the procedure described above applies accordingly.

[0066] The vehicle 100 on the right and the hydrogen filling station 200 on the left are in the Figure 4shown only schematically. The process flow is shown by a time axis with elapsed time t, on the right in Figure 4 , symbolizes.

[0067] First, the refueling process 500 is initiated by the user 430 at the hydrogen refueling station 200. Hydrogen is then supplied to the vehicle tank 110 via the gas hose 260. The gas meter 220 measures the amount of hydrogen released.

[0068] Subsequently, in a communication establishment step 510, the communication connection 300 is established between the vehicle 100 and the hydrogen filling station 200. Alternatively, the communication connection 300 can also be established before the refueling process 500 or during the refueling process 500.

[0069] Subsequently, i.e., after completion of the refueling process 500 or at an intermediate point in the refueling process 500, in a meter information transmission step 520, a piece of meter information 310 is transmitted from the gas meter 220 by means of the control unit 230 via the communication link 300 to the vehicle 100. The meter information 310 contains the amount of hydrogen measured by the gas meter 220 or its value. The meter information 310 also has a security feature 315, in this case in the form of a digital signature, which must be decrypted by the vehicle 100 or the control unit 120 before the meter information 310 is trusted.

[0070] In addition to the counter information 310, the amount of hydrogen gas absorbed in the vehicle tank 110 is determined on the vehicle 100 or the control unit 120 in a corresponding determination step 530 and made available to the control unit 120.

[0071] In the subsequent comparison step 540, the control unit 120 compares the counter information 310, or the measured hydrogen gas quantity, with the absorbed hydrogen gas quantity. In doing so, a possible difference in gas quantity between the measured hydrogen gas quantity and the absorbed hydrogen gas quantity is determined.

[0072] If the determined differential gas quantity is zero or does not exceed a predetermined limit, a success message 330 provided with a security feature 335 is transmitted to the hydrogen filling station 200 via the communication connection 300, which indicates to the water filling station 200 that the refueling process 500 was error-free. This process corresponds to the success message step 550.

[0073] If, however, it is determined, as shown below merely for illustrative purposes, that the determined differential gas quantity exceeds the predetermined limit, an error message 340 provided with a security feature 345 is transmitted to the hydrogen filling station 200 via the communication connection 300, which indicates to the water filling station 200 a faulty refueling process 500. This process corresponds to the error message step 560.

[0074] Figure 5shows an exemplary temporal profile of a pressure p in the vehicle tank 110 during the refueling process 500. At various times t 1 , t 2 , t 3 , where t 3 is an end time of the refueling process 500 and t 1 and t 2 are intermediate points in time, the differential gas quantity is checked to determine whether the respective differential gas quantity exceeds the predetermined limit value by determining the quantity of hydrogen gas absorbed in the vehicle tank 110 at the times t 1 , t 2 , t 3 on the basis of the pressure p 1 , p 2 , p 3 prevailing at that time using the thermal equation of state for ideal gases. This makes it possible to detect a faulty refueling process 500 even before it ends.

[0075] The above explanation of the embodiments describes the present invention exclusively within the framework of exemplary embodiments. Of course, individual features of the embodiments can be freely combined with one another, provided they are technically feasible, without departing from the scope of the claims. List of reference symbols

[0076] 100Vehicle 110Vehicle tank 120Control unit 130First wireless communication device 200Hydrogen refueling station 210Hydrogen tank 220Gas meter 230Control unit 240Measuring capsule 250Second wireless communication device 260Gas hose 270Fuel nozzle 280Meter reading display 300Communication connection 310Meter information 330Message, success message 335Security feature 340Message, error message 345Security feature 400External device 410First wireless communication device 420Computing unit 430User, driver 440Further communication connection 500Refueling process 510Communication setup step 520Meter information transmission step 530Determination step 540Comparison step 550Success message step 560Error message step tTime pPressure

Claims

1. A method of checking an amount of a hydrogen gas delivered to a vehicle (100) at a hydrogen refueling station (200) during a refueling process (500) of the vehicle (100), the method comprising the steps of: (a) Filling a vehicle tank (110) of the vehicle (100) during the refueling process at the hydrogen refueling station (200), (b) Measuring the amount of hydrogen gas delivered to the vehicle tank (110) during the refueling process (500) by means of a gas meter (220) of the hydrogen refueling station (200), (c) Establishing a communication link (300) between the hydrogen refueling station (200) and the vehicle (100) or an external device (400) connected to the vehicle (100), (d) Transmitting at least one meter information (310) of the gas meter (220), which contains the amount of hydrogen gas measured by the gas meter (220), to the vehicle (100) or the external device (400) by means of the communication link (300), and (e) Determining the amount of hydrogen gas absorbed in the vehicle tank (110) during the refueling process (500), - Determining a differential gas quantity between the measured gas quantity of hydrogen and the absorbed gas quantity of hydrogen, characterized in that the method further comprises the step: - Transmission of a message (330, 340) based on the determined differential gas quantity to the hydrogen refueling station (200) by means of the communication link (300).

2. The method according to claim 1, wherein the determination of the amount of hydrogen gas absorbed in the vehicle tank (110) during the refueling process (500) is performed by the vehicle (100).

3. The method according to any one of the preceding claims, wherein the determination of the amount of differential gas is performed by a control unit (120) of the vehicle (100) or the external device (400).

4. The method according to claim 3, wherein (a) a success message (330) is transmitted to the hydrogen refueling station (200) as a message (330, 340), which indicates to the hydrogen refueling station (200) an error-free refueling process (500) if the determined differential gas quantity is zero or does not exceed a predetermined limit value, and / or (b) an error message (340) is transmitted to the hydrogen refueling station (200) as a message (330, 340), which indicates to the hydrogen refueling station (200) a faulty refuelling process (500) if the determined differential gas quantity exceeds the predetermined limit value.

5. The method according to any one of the preceding claims, wherein the message (330, 340) is signed by a security feature (335, 345) of the vehicle (100) or the external device (400).

6. The method according to claim 4 or 5, the method further comprising an electronic payment process for the refueling process (500) at the hydrogen refueling station (200), wherein a payment is made in the payment process based on the amount of gas of the hydrogen received in the vehicle tank (110) or based on the amount of gas of the hydrogen received in the vehicle tank (110) and reduced by the predetermined limit value.

7. The method according to any one of the preceding claims, wherein the meter information (310) is signed by a security feature (315) of the hydrogen refueling station (200).

8. The method according to any one of the preceding claims, wherein a smartphone or a tablet computer is used as the external device (400).

9. The method according to one of the preceding claims, wherein the hydrogen refueling station (200) comprises a control unit (230) connected to the gas meter (220), wherein the control unit (220) is arranged to transmit the at least one meter information (310).

10. The method according to claim 9, wherein the gas meter (220) and the control unit (230) are arranged in a common measuring capsule (240).

11. The method according to any one of the preceding claims, wherein the vehicle (100) or the device (400) comprises a first wireless communication device (130, 410) and the hydrogen refueling station (200) comprises a second wireless communication device (250) for establishing a wireless communication link (300).

12. The method according to any one of the preceding claims, wherein the method is performed during the ongoing refueling process (500) for a partial amount of the total amount of hydrogen gas measured during the refueling process (500).

13. A system comprising a vehicle (100) having a vehicle tank (110) for holding hydrogen and a hydrogen refueling station (100) for delivering a gas quantity of a hydrogen to the vehicle tank (110) of the vehicle (100) during a refueling process (500) and having a gas meter (220), wherein the system is adapted to perform the method according to any one of the preceding claims.