Method for checking a measurement of a filling flow rate of a pressurised tank

Abstract

The invention relates to a method for checking a measurement of a filling flow rate of a tank (10) connected to a station (100) for dispensing a pressurised fluid, the station (100) comprising a fluid source (2), a dispenser (4) connected to the source (2) and a supply hose (6) connected to the dispenser (4) and intended to be coupled to the tank (10) to be filled, the dispenser (4) being equipped with a pressure sensor, a temperature sensor and a flow meter, the method comprising the following operations: - measuring (S1) a flow rate datum (I) at a time (t) using the flow meter installed at the dispenser (4); - estimating (S2) a flow rate datum (II) at the dispenser (4) at the time (t), the estimation being based on the following parameters: a first pressure datum (P disp ) of the fluid at the time (t) measured by the pressure sensor installed at the dispenser, a second temperature datum (T disp ) of the fluid at the time (t) measured by the temperature sensor installed at the dispenser (4), a third pressure datum (P tank ) of the fluid at the time (t) in the tank (10) to be filled, the third datum being measured using a pressure sensor arranged in the tank (10) or calculated on the basis of a physical model, a fourth predetermined datum of the hydraulic pressure loss coefficient (k v ) caused by the supply hose (6); - comparing (S3) the measured flow rate datum (I) and the estimated flow rate datum (II) at the time (t); and - generating (S4) a signal representative of the reliability of the estimated flow rate datum (I).

Description

Method for controlling a flow rate measurement of a pressure vessel filling.

[0001] The invention relates to a method for controlling the flow rate measurement of a tank connected to a pressurized fluid dispensing station. The fluid in question may be gaseous hydrogen. The tank in question may be that of a fuel cell vehicle (FCV) running on hydrogen.

[0002] In a distribution station, it is necessary to know the flow rate of the fluid delivered, not only for billing purposes but also for safety reasons during filling operations. Knowing the flow rate also allows for estimating the tank volume, and thus selecting the appropriate filling protocol (SAE J2601) for that tank volume.

[0003] To access data on the flow rate of fluid transferred to a reservoir, the distribution station includes a flow meter.

[0004] In the event of malfunctions, the flow meter provides erroneous flow data. Consequently, the tank volume estimation, which is necessary to determine the tank category, will be inaccurate. Furthermore, the choice of filling protocol will be biased due to the lack of accurate information on the tank category.

[0005] For example, an overestimated mass flow rate will lead to an overestimation of the tank volume. Filling will then be carried out according to a protocol designed for a larger tank.

[0006] Similarly, in the event of erroneous data on mass flow rate, a safety barrier, intended to prevent overfilling or excessive heating of the tank to be filled, can no longer reliably perform its function.

[0007] To check the reliability of the flow measurements provided by a flowmeter, one solution could be, on the one hand, to weigh the tank before and after filling, then to note the difference in the masses obtained; and on the other hand, to integrate over the duration of the filling the flow measured by the flowmeter.

[0008] Assuming that the difference between the masses obtained by weighing the tank before and after filling is accurate, a discrepancy between the result thus obtained and the result obtained by integrating the flow rate measured over the filling time would then be an indication of an error in the flow rate measurement given by the flow meter.

[0009] However, such a control solution introduces several technical difficulties when weighing the tank before and after filling, and requires a relatively long time to perform this weighing.

[0010] Therefore, the control solution described above is not feasible at distribution stations.

[0011] It therefore appears necessary to develop a method for controlling the measurement of the filling flow rate of a tank supplied by a distribution station, which is simple to implement and does not require additional means on the station.

[0012] To this end, the invention proposes a method for controlling a measurement of the filling flow rate of a tank connected to a distribution station of a pressurized fluid.

[0013] The station includes a fluid source, a distributor connected to the source, and a supply hose connected to the distributor and intended to be connected to the tank to be filled. Specifically, the distributor is equipped with a pressure sensor, a temperature sensor, and a flow meter.

[0014] The method according to the invention comprises the following operations: - measurement of a flow rate data at time t using the flow meter installed at the distributor, - estimation of a flow rate data at the distributor at time t, the estimation being based on the following parameters: a first data of the fluid pressure at time t measured by the pressure sensor installed at the distributor, a second data of the fluid temperature at time t measured by the temperature sensor installed at the distributor, a third data of the fluid pressure in the tank to be filled, the third data being measured using a pressure sensor placed in the tank or calculated from a physical model, a fourth predetermined data of the coefficient of hydraulic pressure losses due to the supply hose, - comparison between the measured data and the estimated data of the flow rate at time t.Such a comparison makes it possible to verify the reliability of the measured flow rate data.

[0015] Embodiments of the invention may include one or more of the following features: - the estimated data The filling flow rate at time t is obtained from a predetermined calculation formula. which is a function of a ratio between the predetermined coefficient pressure losses and the square root of the temperature measured at the distributor level, the calculation formula includes: - a first sub-formula allowing estimation of the flow rate for a given pressure in the distributor lower than twice the pressure (t) in the reservoir, the first subformula being a function of the square root of the difference between the pressure in distributor and pressure in the reservoir, and a second sub-formula allowing estimation of the flow rate for a given pressure in the distributor higher than double the pressure in the tank, the second sub-formula given by a linear function with respect to pressure in the dispenser - the first and second sub-formulas , are expressed respectively in the following manner:

[0016] , For , For

[0017] with:

[0018] And : respectively the pressure in the distributor and the pressure in the tank, expressed in [ ;

[0019] : the coefficient of hydraulic pressure losses due to the supply hose and the receiving pipe specific to the tank to be filled, expressed in [ ;

[0020] A: a coefficient dependent on density of the fluid at 0°C and 1.0135 bar (expressed in [ ), the density of air at 0°C and 1.0135 bar (expressed in ] ), the compressibility factor of the fluid in the distributor (expressed without units), - the coefficient (A) depends on a ratio between, on the one hand, the product of the density of the air and the density of the fluid and on the other hand, the compressibility factor of the fluid in the distributor, the expression for the coefficient (A) being given by:

[0021]

[0022] -the process includes at least one stopping phase [ ] of the filling, the pressure in the tank being deducted from the pressure in the distributor measured immediately before the stop phase [ ] of the filling and / or after the stopping phase [ ] of the filling, - at least one stopping phase [ ] of the filling includes two time intervals [ ], [ ] in each of which the pressure The dispenser varies and presents a maximum and a minimum , the estimation of the data the filling flow rate being carried out over any one of said intervals [ ], [ ],- the estimation of the data of the flow rate over the first time interval [ ] is performed starting from an initial piece of data pressure in the dispenser at the first moment , and starting from an initial piece of data pressure in the tank at the first moment the first piece of data pressure in the tank at the first moment being deduced from a second piece of data pressure in the tank at a second moment and a second piece of data pressure in the dispenser at the second moment the first moment being prior to the second instant the second moment coinciding with the second boundary of the first interval [ and / or the estimation of the data of the flow rate over the second time interval [ ] is performed using a fourth piece of data pressure in the dispenser at a fourth moment and based on a fourth piece of data pressure in the tank at the fourth instant the fourth piece of data pressure in the tank being deduced from a third piece of data pressure in the tank at a third instant and a third piece of information pressure in the dispenser at the third instant the fourth moment being subsequent to the third instant the third moment coinciding with the first boundary of the second interval [ ].- the first piece of data pressure fluid in the dispenser at the first moment is equal to the maximum value of the pressure measured by the pressure sensor over the first interval [ ],- the fourth piece of data pressure fluid in the dispenser at the fourth instant is equal to the maximum value of the pressure measured by the pressure sensor on the second interval [ - the second piece of data pressure fluid in the dispenser at the second instant is equal to the minimum value measured by the pressure sensor over the first interval [ ], respectively - the third data pressure fluid in the dispenser at the third instant is equal to the minimum value measured by the pressure sensor on the second interval [ ],- the first data pressure in the tank at the first moment is equal to the second piece of data pressure fluid in the dispenser at the second instant - the fourth piece of data pressure in the tank at the fourth instant is equal to the third piece of data pressure in the dispenser at the third instant - the process comprising a step consisting of comparing: i) the data measured by the flow meter at the second instant , respectively at the third instant with a predefined initial threshold value ; and / yes) the difference between the second piece of data and the first piece of data , respectively between the fourth data and the third piece of data pressure fluid in the dispenser with a second predefined threshold value - the equality between the first data pressure in the tank at the first moment and the second piece of data pressure in the dispenser at the second moment , respectively between the fourth data pressure in the tank at the fourth instant and the third piece of data pressure in the dispenser at the third instant is accepted when one of the following criteria is met: i) the data measured by the flow meter at the second instant , respectively at the third instant is less than the first predefined threshold value ii) the difference between the second data and the first piece of data , respectively between the fourth data and the third piece of data pressure The fluid level in the dispenser is below the second predefined threshold value. - the stopping phase [ The filling process is part of a leak test operation designed to check the tightness of a fluid connection between the supply hose and the tank to be filled; the pressure loss coefficient is the sum of a first component relating to losses due to the supply hose, and a second component relating to losses due to a receiving pipe attached to the tank to be filled.

[0023] Other features and advantages will become apparent upon reading the description below, which refers to the following figures in which:

[0024] illustrates schematically a reservoir connected to a pressurized fluid distribution station, the station comprising in this order: a source, a pressure and / or flow control valve, a distributor and a supply hose, the distributor being equipped with a flow meter, a pressure sensor and a temperature sensor.

[0025] illustrates the steps in the process of controlling a filling flow rate measurement according to the invention;

[0026] illustrates evolution curves of physical parameters during a test filling of a test tank connected to a distribution station: temperature, pressure and flow measured at the distributor, pressure measured in the test tank.

[0027] Laillustre a reservoir 10 to be filled from a station 100 distributing a pressurized fluid.

[0028] The tank 10 to be filled may be that of a vehicle 20, and in particular a fuel cell vehicle. In this case, the tank 10 to be filled may be located inside the vehicle 20.

[0029] The distribution station 100 includes a source 2 containing the pressurized gaseous fluid, a distributor 4 connected to the source 2, and a supply hose 6 connected to the distributor 4 and intended to be connected to the tank 10 to be filled.

[0030] In addition, the distribution station 100 includes a flow and / or pressure control valve 8 located between the source 2 and the distributor 4. In particular, the distributor 4 includes a pressure sensor, a temperature sensor, and a flow meter which measures the flow of the fluid supplied to the tank 10 to be filled.

[0031] The reservoir 10 to be filled can be provided with a receptacle which ensures fluidic and mechanical coupling with the supply hose 6.

[0032] When the tank 10 is located inside a vehicle 20, the receptacle is fixed to the outside of the vehicle to ensure the connection between the tank 20 and the supply hose 6. A receiving conduit then connects the receptacle to the internal volume of the tank 10.

[0033] During the filling of a tank 10 of vehicle 20 attached to the distribution station 100, the flow meter installed at the distributor 4 measures the flow of fluid which is delivered to the tank 10 for several purposes.

[0034] First, the measured flow rate allows us to determine the initial volume of tank 10 and the filling protocol to be applied for the remainder of the process. Second, the measured flow rate ensures compliance with predefined safety criteria by estimating the pressure and temperature of the fluid in tank 10 using physical models at each stage of the filling process. Finally, the measured flow rate allows us to determine the mass of fluid injected into tank 10 for billing purposes.

[0035] In the event of a flow meter failure and an erroneous flow measurement, the data based on this measurement—namely, the initial volume of tank 10, the selected filling protocol, the mass of fluid delivered, etc.—will be affected. This compromises the safety of filling operations and skews the measurement of the quantity of fluid to be billed.

[0036] To prevent the above inconveniences, with reference to the, the invention proposes a new method for controlling the measurement of the filling flow rate of a tank 10 connected to a distribution station 100 as presented above.

[0037] The process includes the following operations: - measurement S1 of a data point of the flow rate at a given time t, measurement S1 being carried out using the flow meter installed at distributor 4, - estimation S2 of a data point of the flow rate at distributor 4 at time t, - comparison S3 between the measured data and the estimated data of the flow rate at time t, - generation S4 of a signal representative of the reliability of the measured data flow rate.

[0038] In particular, the S2 estimate is based on the following parameters: pressure of the fluid measured by the pressure sensor, the temperature of the fluid measured by the temperature sensor, the pressure of the fluid in the tank 10 to be filled, a coefficient predetermined hydraulic pressure losses, the losses being due to the supply hose 6.

[0039] Advantageously, the pressure The pressure of the fluid in the tank 10 to be filled is measured using a pressure sensor located in the tank 10. Alternatively, this pressure is calculated from a physical model or measured at the level of flexible 6.

[0040] The S3 comparison between the measured data of the flow rate and the estimated data The flow rate is measured by a controller and aims to identify any discrepancy between these two data points.

[0041] When the measured deviation exceeds a given threshold value, the controller generates a signal indicating that the data The measured flow rate is incorrect, and therefore the flow meter is defective.

[0042] Thus, based on the discrepancy observed between the estimated data flow rate and measured data The flow rate process allows the condition of the flow meter to be determined.

[0043] Advantageously, the estimated data The filling flow rate at time t is obtained from a mathematical relationship / formula or equation which is a function of a ratio between the coefficient pressure losses and the square root of the temperature measured at the distributor level.

[0044] In particular, the formula includes a first sub-formula and a second sub-formula .

[0045] The first sub-formula allows estimating the flow rate for a given pressure in distributor 4 less than twice the pressure (t) in reservoir 2. This first sub-formula is a function of the square root of the difference between the pressure in distributor 4 and the pressure in tank 10.

[0046] The second sub-formula allows estimating the flow rate for a given pressure in distributor 4 greater than double the pressure in tank 2. This second sub-formula is a linear function of pressure in dispenser 4.

[0047] The sub-formulas And can be expressed in the following way:

[0048] For : (1)for : (2)

[0049] with:

[0050] And : respectively the pressure in the distributor 4 and the pressure in the tank to be filled 10, expressed in (has)];

[0051] : the coefficient of hydraulic pressure losses due to the supply hose 6 and the receiving conduit specific to the tank to be filled 10, expressed in [ ;

[0052] A: a coefficient dependent on density of the fluid at 0°C and 1.0135 bar (expressed in ), the density of air at 0°C and 1.0135 bar (expressed in ), the compressibility factor fluid in the dispenser (unitless).

[0053] The coefficient A in relations (1) and (2) above depends on a ratio between, on the one hand, the product of the density of air by the fluid density and on the other hand the compressibility factor fluid in the dispenser.

[0054] The expression for the coefficient A can be given by:

[0055] (3)

[0056] In the expression of the estimated flow rate given by relation (1) above, the pressure The amount of fluid in the tank 10 to be filled is generally unknown to the dispensing station 100. This pressure can be deduced from the pressure measured by the pressure sensor installed at distributor 4.

[0057] In particular, the pressure The pressure in tank 10 at a given time can be deduced. in distributor 4 measured at a previous or later time.

[0058] To deduce from The invention is based on the findings of a test filling a test tank from a dispensing station as described above. The test includes at least one shutdown phase. The test tank is equipped with at least one pressure sensor.

[0059] Laillustre shows the evolution curves of physical parameters recorded during such a test. These include the pressure, temperature and flow rate of the fluid at the distributor 4 of the station, and the pressure of the fluid in the test tank.

[0060] We observe on this lake, during a stopping phase [ ] of filling (here during the first shutdown phase), the pressure The fluid level in distributor 4 drops from an initial maximum measured at a first instant at a minimum measured at a second instant The second moment being subsequent to the first instant .

[0061] It is also observed that the fluid pressure in distributor 2 reaches a second maximum measured at a fourth instant starting from a minimum measured at a third instant The fourth moment is subsequent to the third instant .

[0062] In particular, at the second moment and at the third moment the pressure measured in distributor 4 is identical to the pressure measured in test tank 10. This marks a pressure balance between distributor 4 and test tank 10, but also between hose 6 and test tank.

[0063] This balance of pressure between moments And translates to the following relationship: .

[0064] More generally, we observe that the pressure in distributor 4 (but also in hose 6) equalizes with the pressure in tank 10 immediately after the mass flow stops. Similarly, immediately after filling resumes, the pressure in distributor 4 (but also in hose 6) is close to or equal to the pressure in tank 10.

[0065] Furthermore, during the shutdown phase [ ], the flow measurement suggests that the mass of fluid introduced into the test tank 10 is negligible compared to the mass already present in said tank 10.

[0066] Thus, the pressure of the fluid in the reservoir 10 at the second instant is approximately equal to the pressure of the fluid in the reservoir 10 at the first instant the first moment being prior to the second Similarly, the pressure of the fluid in the reservoir 10 at the third instant is approximately equal to the pressure of the fluid in the reservoir 10 at the fourth instant the fourth moment being subsequent to the third instant .

[0067] From the above, we can derive the following relationship:

[0068] From relation (4) and relation (5), we deduce:

[0069] Thus, advantageously, in order to determine the pressure in tank 10 to be filled, and estimate the data of the flow rate, the process includes at least one stopping phase [ ].

[0070] This shutdown phase [ ] includes two time intervals [ ], [ ] in each of which the pressure in dispenser 4 varies and presents a maximum and a minimum The S2 estimation of the data the filling flow rate can be achieved over any of the intervals [ ], [ ].

[0071] The S2 estimation of the data of the flow rate over the first time interval [ ] is performed starting from an initial piece of data pressure in dispenser 4 at first moment , and starting from an initial piece of data pressure in tank 10 at the first instant .

[0072] The first piece of data pressure fluid in distributor 4 at the first moment is equal to the maximum value of the pressure measured by the pressure sensor over the first interval [ ].

[0073] The first piece of data pressure in tank 10 at the moment can be deduced from a second piece of data pressure in tank 10 at a second instant and a second piece of data pressure in dispenser 4 at the second instant The second moment is subsequent to the first instant and coincides with the second boundary of the first interval [ ].

[0074] More specifically, the first piece of data pressure in tank 10 at the first instant is equal to the second piece of data pressure in tank 10 at the second instant The latter is equal to the second piece of data. pressure fluid in distributor 4 at the second instant .

[0075] The second piece of data pressure fluid in distributor 4 at the second instant is equal to the minimum value measured by the pressure sensor over the first interval [ ].

[0076] Data estimation of the flow rate over the second time interval [ ] is performed using a fourth piece of data pressure in dispenser 4 at a fourth instant and based on a fourth piece of data pressure in the tank at the fourth instant .

[0077] The fourth piece of data pressure fluid in distributor 4 at the fourth instant is equal to the maximum value of the pressure measured by the pressure sensor on the second interval [ ].

[0078] The fourth piece of data pressure The value in tank 10 is deduced from a third piece of data. pressure in tank 10 at a third instant and a third piece of information pressure in dispenser 4 at the third instant The third moment is prior to the fourth instant and coincides with the first boundary marker of the second interval [ ].

[0079] More specifically, the fourth piece of data pressure in tank 10 at the fourth instant is equal to the third piece of data pressure in tank 10 at the third instant This last piece of data is equal to the third piece of data. pressure in dispenser 4 at the third instant .

[0080] It should be noted that the third piece of data pressure fluid in distributor 4 at the third instant is equal to the minimum value measured by the pressure sensor on the second interval [ ].

[0081] Advantageously, the process includes an S5 operation consisting of comparing the data of the flow rate measured at the second instant (respectively at the third moment) ) with a first predefined threshold value .

[0082] As a complement or alternative, operation S5 compares the difference between the second data point and the first piece of data (respectively the difference between the fourth data point) and the third piece of data ) of the pressure fluid in the dispenser with a second predefined threshold value .

[0083] The equality between the first data pressure in tank 10 at the first instant and the second piece of data pressure in distributor 4 at the second instant (respectively between the fourth data pressure in tank 10 at the fourth instant and the third piece of data pressure in dispenser 4 at the third instant ) is accepted when one of the following criteria is met: i) the data measured at the second instant (respectively at the third moment) ) by the flow meter is lower than the first predefined threshold value ii) the difference between the second data and the first piece of data (respectively between the fourth data and the third piece of data ) of the pressure The fluid level in the dispenser is below the second predefined threshold value. .

[0084] Advantageously, the stopping phase [ ] filling is part of a leak test operation intended to check the tightness of a fluid connection between the supply hose 6 and the tank 10 to be filled.

[0085] Advantageously, the pressure loss coefficient is the sum of a first component relating to pressure losses due to the supply hose 6, and a second component relative pressure losses due to a receiving pipe specific to the tank to be filled.

[0086] The present method offers the advantage of estimating a mass flow rate without a flow meter, using only pressure and temperature data from the filling station 100, data considered reliable and easily accessible using measurement means from the filling station.

Claims

Method for controlling a flow rate measurement for filling a tank (10) connected to a pressurized fluid distribution station (100), the station (100) comprising a fluid source (2), a distributor (4) connected to the source (2) and a supply hose (6) connected to the distributor (4) and intended to be coupled to the tank (10) to be filled, the distributor (4) being equipped with a pressure sensor, a temperature sensor, and a flow meter, the method comprising the following operations: - measurement (S1) of a data ( ) of the flow rate at a specific time (t) using the flow meter installed at the distributor (4), - estimation (S2) of a data point ( ) of the flow rate at the distributor (4) at time (t), the estimate being based on the following parameters: the pressure ( ) of the fluid measured by the pressure sensor, the temperature ( ) of the fluid measured by the temperature sensor, the pressure ( ) of the fluid in the tank (10) to be filled, measured using a pressure sensor located in the tank (10) or calculated from a physical model, a predetermined coefficient ( ) of hydraulic pressure losses, the losses being due to the supply hose (6) and a receiving conduit specific to the tank to be filled (10), - comparison (S3) between the measured data ( ) and the estimated data ( ) of the flow rate at time (t),- generation (S4) of a signal representative of the reliability of the estimated data ( ) of the flow rate. A method according to the preceding claim, wherein the estimated data ( ) of the filling flow rate at time (t) is obtained from a predetermined calculation formula ( which is a function of a ratio between the predetermined coefficient pressure losses and the square root of the temperature ( measured at the distributor level (4), the calculation formula ( including: - a first sub-formula ( allowing estimation of the flow rate for a given pressure ( in the distributor (4) less than twice the pressure (t)) in reservoir (10), the first subformula ( being a function of the square root of the difference between the pressure in distributor (4) and pressure ) in reservoir (10), and a second subformula allowing estimation of the flow rate for a given pressure in the distributor (4) greater than twice the pressure in reservoir (10), the second subformula given by a linear function with respect to pressure in the dispenser (4). A method according to the preceding claim, wherein the first and second subformulas ( , ) are expressed respectively in the following manner: , For , For with: And : respectively the pressure in the distributor (4) and the pressure in the reservoir (10), expressed in [ ; : the coefficient of hydraulic pressure losses due to the supply hose and the receiving pipe specific to the tank to be filled, expressed in [ ;A: a coefficient dependent on the density of the fluid at 0°C and 1.0135 bar (expressed in [ ), the density of air at 0°C and 1.0135 bar (expressed in ] ), the compressibility factor of the fluid in the dispenser (expressed without units). A method according to the preceding claim, wherein the coefficient (A) depends on a ratio between, on the one hand, the product of the air density ( ) and the density of the fluid ( ), and on the other hand the compressibility factor ( ) of the fluid in the distributor (4), the expression for the coefficient (A) being given by: A method according to any one of the preceding claims, comprising at least one stopping phase ([ ]) of the filling, the pressure ( ) in the reservoir (10) being deducted from the pressure ( ) in the distributor (4) measured immediately before the stopping phase ([ ]) of the filling and / or after the stopping phase ([ ]) of the filling. A method according to the preceding claim, wherein at least one stopping phase ([ ]) of the filling includes two time intervals (([ ]), ([ ])) in each of which the pressure in the dispenser (4) varies and presents a maximum and a minimum ( ), the estimation of the data ( ) of the filling flow rate being carried out over any one of said intervals (([ ]), ([ ])). A method according to the preceding claim, wherein a) the estimation of the data ( ) of the flow rate over the first time interval ([ ]) is performed starting from a first piece of data pressure ( ) in the dispenser (4) at a first instant ( ), and starting from a first piece of data ( ) of the pressure ( ) in the reservoir (10) at the first instant ( ), the first piece of data ( ) of the pressure ( ) in the reservoir (10) at the first instant ( ) being deduced from a second piece of data pressure ( ) in the reservoir (10) at a second instant ( ) and a second piece of data ( ) of the pressure ( ) in the dispenser (4) at the second instant ( ), the first instant ) being prior to the second instant ( ), the second instant ( ) coinciding with the second bound of the first interval ([ ]) and / or) the estimation of the data ( ) of the flow rate over the second time interval ([ ]) is performed using a fourth piece of data ( ) of the pressure ( ) in the dispenser (4) at a fourth instant ( ), and from a fourth piece of data ( ) of the pressure ( ) in the reservoir (10) at the fourth instant ( ), the fourth piece of data ( ) of the pressure ( ) in the reservoir (10) being deduced from a third piece of data pressure ( ) in the reservoir (10) at a third instant ( ), and a third piece of data ( ) of the pressure ( ) in the dispenser (4) at the third instant ( ), the fourth instant ( ) being subsequent to the third instant ), the third moment ( ) coinciding with the first bound of the second interval ([ ]). A method according to the preceding claim, wherein the first data pressure ( ) of the fluid in the distributor (4) at the first instant ( ) is equal to the maximum value of the pressure measured by the pressure sensor over the first interval ([ ], respectively - the fourth data point pressure ( ) of the fluid in the distributor (4) at the fourth instant ( ) is equal to the maximum value of the pressure measured by the pressure sensor on the second interval ([ ]. A method according to any one of claims 7 or 8, wherein the second data pressure ( ) of the fluid in the distributor (4) at the second instant ( ) is equal to the minimum value measured by the pressure sensor on the first interval ([ ]), respectively - the third data pressure ( ) of the fluid in the distributor (4) at the third instant ( ) is equal to the minimum value measured by the pressure sensor on the second interval ([ ]). A method according to any one of claims 7 to 9, wherein the first given ( ) of the pressure ( ) in the reservoir (10) at the first instant ( ) is equal to the second data pressure ( ) of the fluid in the distributor (4) at the second instant ( ), respectively - the fourth piece of data ( ) of the pressure ( ) in the reservoir (10) at the fourth instant ( ) is equal to the third data point pressure ( ) in the dispenser (4) at the third instant ( ). A method according to any one of claims 7 to 10, comprising a step (S5) of comparing: i) the data ( ) measured by the flow meter at the second instant ( ), respectively at the third instant ( ), with a first predefined threshold value ( ); and / yes) the difference between the second data and the first piece of data , respectively between the fourth data and the third piece of data , pressure ( ) of the fluid in the distributor (4) with a second predefined threshold value ( ). A method according to the preceding claim, wherein the equality between the first given ( ) of the pressure ( ) in the reservoir (10) at the first instant ( ) and the second piece of data pressure ( ) in the dispenser (4) at the second instant ( ), respectively between the fourth data point ( ) of the pressure ( ) in the reservoir (10) at the fourth instant ( ) and the third piece of data pressure ( ) in the dispenser (4) at the third instant ( ) is admitted when one of the following criteria is met: i) the data ( ) measured by the flow meter at the second instant ( ), respectively at the third instant ( ), is less than the first predefined threshold value ( ),ii) the difference between the second data and the first piece of data , respectively between the fourth data and the third piece of data , pressure ( ) of the fluid in the distributor (4) is less than the second predefined threshold value ( ). A method according to any one of claims 4 to 12, wherein the stopping phase ([ ]) of filling is part of a leak test operation intended to check the tightness of a fluid connection between the supply hose (6) and the tank (10) to be filled. A method according to any one of the preceding claims, wherein the pressure loss coefficient ( ) is the sum of a first component ( ) relating to losses due to the supply hose, and a second component ( ) relating to losses due to a receiving conduit attached to the tank (10) to be filled.

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