Method and device for analyzing an electrical network on board a vehicle

Abstract

Method and device for analyzing an electrical network on board a vehicle The present invention relates to a method for analyzing an electrical network (30) on board a vehicle, the electrical network (30) comprising electronic cut-off members (32, 34, 36) of different ratings, the analysis method being characterized in that it comprises: - a step of measuring a current (I) flowing through one of the electronic cut-off members (32, 34, 36) when the electronic cut-off member (32, 34, 36) is in an on-state, over an analysis period (p), and - a step of determining an oversizing, an undersizing or a good sizing of the electronic cut-off member (32, 34, 36) with respect to a use of the electronic cut-off member (32, 34, 36) over the analysis period (p), from a rating of the electronic cut-off member (32, 34, 36) and of at least one current measurement from the measurement step. (Figure 1)

Description

Title of the invention: Method and device for analyzing an electrical network on board a vehicle

[0001] The present invention relates to the fields of electricity and automobiles, and more specifically concerns a method and a device for analyzing an electrical power supply network on board a vehicle.

[0002] Such an electrical supply network generally comprises a fuse box connected on the one hand to a service battery of the vehicle, with a nominal no-load voltage generally of the order of 12V (volts), and on the other hand to one or more distribution boxes comprising power transistors for supplying the electrical consumers of the vehicle.

[0003] These power transistors, called electronic cut-off components or "SmartMOS" in English, are chips containing one or more transistors such as MOSFET transistors (for "metal-oxide-semiconductor field-effect transistor"), controlled by a control circuit allowing a circuit to be opened in a short-circuit situation in 10qs (microseconds) to 10ms. These new components therefore have the advantage of meeting the safety requirements of motor vehicles, particularly those with a high software component. However, these components are expensive, especially since they support a high current.

[0004] Now the electrical network of such a vehicle can comprise some two hundred transistors, each electrical consumer of the vehicle being protected by a transistor, the current passing through each transistor being measured to be supervised by a control circuit.

[0005] The transistors used in the on-board electrical network of the vehicle exist in different categories, in particular there are transistors capable of supporting a direct current ranging from 0 to IA (ampere), up to 3A, from 4 to 7A, from 8 to 12A, up to 20A or up to 30A.

[0006] It is therefore important to properly size the transistors of the on-board electrical network. Indeed, an oversized transistor for the power supply of an electrical consumer presents an unnecessary additional cost, and an undersized transistor for this power supply will have a lifespan that is too short compared to the estimated lifespan of the vehicle.

[0007] The evaluation of the sizing of the transistors of the on-board electrical network of the vehicle is done during the design of the latter, by independently evaluating the consumption of each electrical consumer and by adding a safety margin to this evaluation. As a result, this sizing is often oversized.

[0008] The present invention aims to remedy at least in part the aforementioned drawbacks by providing a method and a device for analyzing an electrical network on board a vehicle, which make it possible to correct the dimensioning of the electrical network of a vehicle by using data linked to the use of the electrical consumers of the vehicle.

[0009] To this end, the invention proposes a method for analyzing an electrical network on board a vehicle, the electrical network comprising electronic cut-off devices of different calibers, the analysis method being characterized in that it comprises: - a step of measuring a current flowing through one of the electronic cut-off devices when the electronic cut-off device is in an on state, over an analysis period, and - a step of determining oversizing, undersizing or correct sizing of the electronic cut-off device in relation to use of the electronic cut-off device over the analysis period, based on a rating of the electronic cut-off device and at least one current measurement from the measurement step.

[0010] The measurement step takes place during use of the vehicle over the analysis period, and the determination step takes place after the analysis period, either in a computer of the vehicle or in a computer remote from the vehicle. Thus the analysis method according to the invention makes it possible, starting from a pre-production vehicle for example, to correct the dimensioning of the electrical network to put it on a vehicle of the same type before its production output.

[0011] Preferably of course, the method comprises a current measurement for each electronic cut-off device of the vehicle's electrical network, and a determination for each of these devices of oversizing, undersizing or good sizing in relation to its use over the analysis period. The electronic cut-off devices are preferably transistors, for example MOSFET transistors.

[0012] Furthermore, the current measurement preferably takes place only when the electronic cut-off device is in the on state, in order to limit the data to be processed.

[0013] According to a characteristic of the analysis method according to the invention, the determination step uses at least: - a comparison of a maximum current measured during the measurement step with a maximum or minimum current threshold associated with the rating of the electronic cut-off device, and / or - a comparison of a characteristic value of an average of current measurements made at the measurement stage with a high value or a low value associated with the rating of the electronic cut-off device, and / or - a comparison of a value representative of an average of current measurements carried out at the measurement step in a predetermined range of current values ​​with a current range corresponding to the rating of the electronic cut-off device.

[0014] The maximum current measured during the analysis period makes it easy to see whether the rating of the electronic cut-off device is suitable, because if it exceeds the maximum current threshold corresponding to the maximum current that the electronic cut-off device can withstand, it is because the electronic cut-off device is undersized.

[0015] The characteristic value of the average of the current measurements also makes it possible to detect undersizing if this average is greater than the high value of the rating of the electronic cut-off device. The characteristic value is for example an arithmetic mean or a quadratic mean. A current margin is possibly added or subtracted depending in particular on the expected lifetime of the electronic cut-off device in relation to its use.

[0016] The representative value of an average of current measurements carried out in the measurement step in a predetermined range of current values ​​is also, for example, an arithmetic mean or a quadratic mean of the current measurements over the analysis period, carried out for current measurements whose values ​​are within a current range of a rating of electronic cut-off device. This current range corresponds to the rating of the electronic cut-off device being analyzed or to a rating lower or higher than this rating. Optionally, a current margin is optionally added or subtracted from this current range depending in particular on the expected lifetime of the electronic cut-off device in relation to its use. This representative value is directly linked to a given rating of electronic cut-off device and therefore makes it possible to carry out a precise diagnosis of the sizing of the electronic cut-off device..

[0017] In one embodiment of the invention, during the determination step, the maximum current measured during the measurement step during the analysis period is received, and: - when the maximum current is greater than the maximum current threshold associated with the rating, the determination step determines an undersizing of the electronic cut-off device, - when the maximum current is lower than the minimum current threshold associated with the rating, the determination step determines an oversizing of the electronic cut-off device, and - when the maximum current is lower than the maximum current threshold associated with the rating and higher than the minimum current threshold associated with the rating, the determination step determines the correct sizing of the electronic cut-off device.

[0018] In this embodiment of the invention, only the maximum current measured over the analysis period is therefore used to analyze the sizing of the electronic cut-off device, which only requires the recording of one current measurement per electronic cut-off device.

[0019] In another embodiment of the invention, the determining step comprises receiving or calculating the value representative of an average of current measurements made in the measuring step within a predetermined range of current values, and: - when the representative value is zero while the rating of the electronic cut-off device corresponds to a current range greater than or equal to the predetermined range, the determination step determines an oversizing of the electronic cut-off device, or - when the representative value is non-zero while the rating of the electronic cut-off device corresponds to a current range lower than the predetermined range, the determination step determines an undersizing of the electronic cut-off device.

[0020] In this other embodiment of the invention, for example, for the electronic cut-off member, before the determination step, the integral of the current as measured over all the time intervals during which the electronic cut-off member is conducting and crossed by a current whose value is in the predetermined range of current values, as well as the cumulative duration of these time intervals, is saved. In other words, not all the current measurements made by the control circuit of the electronic cut-off member are recorded, but only a cumulative total of some of these measurements, carried out dynamically during the measurement step. This allows a more detailed analysis of the use of the cut-off member over the analysis period while limiting the number of data to be processed. The calculation of the average of the measurements is then carried out, for example, during the determination step, or at the end of the measurement step.

[0021] It should be noted that the predetermined range may correspond to several calibers, for example to all calibers greater than the caliber of the electronic cut-off member, or to all calibers less than the caliber of the electronic cut-off member. In addition, the representative value is optionally adapted to a temperature measured outside the vehicle, in particular to take into account the fact that in winter the vehicle's defrosting and heating systems operate while in summer it is the vehicle's cooling systems that operate.

[0022] Thus the representative value is for example the average of measurements reduced by a current margin in winter for the electronic cut-off devices linked to the heating and defrosting systems, while in summer the representative value is for example the average of measurements reduced by a current margin for the electronic cut-off devices linked to the cooling systems.

[0023] The current margin is for example different depending on temperature ranges, for example in winter the current margin applied for the electronic cut-off devices linked to the heating and defrosting systems is high if the outside temperature is below -10°C (degrees Celsius), a little lower if the outside temperature is in the range [-10°C; 10°C], and zero when the outside temperature is in the range [10°C; 25°C]. Similarly in summer the current margin applied for the electronic cut-off devices linked to the cooling systems is for example zero when the outside temperature is in the range [10°C; 25°C], and not zero when the outside temperature is above 25°C.

[0024] Preferably in this other embodiment of the invention, the determination step comprises a reception or a calculation of a first value representative of an average of current measurements carried out in the measurement step in a first predetermined range of current values ​​corresponding to the rating of the electronic cut-off member, a reception or a calculation of a second value representative of an average of current measurements carried out in the measurement step in a second predetermined range of current values ​​greater than the first predetermined range, and when the second representative value is non-zero, then the determination step determines an under-sizing of the electronic cut-off member, otherwise, when the first representative value is non-zero, then the determination step determines a good sizing of the electronic cut-off member,otherwise the determination step determines an oversizing of the electronic cut-off device.

[0025] Preferably again, in this other embodiment of the invention, when the determination step determines an oversizing or an undersizing of the electronic cut-off member, then the determination step also determines a higher predetermined range of current values ​​for which a corresponding average of current measurements is non-zero, and the determination step is followed by a step of providing a value representative of a rating associated with this higher predetermined range of current values.

[0026] Thus the analysis method according to the invention provides a caliber value making it possible to correct under-sizing or over-sizing of the electronic cut-off device.

[0027] Of course, variant embodiments using combinations of data recorded in the measurement step in these different embodiments are possible. For example, as a variant, during the determination step, the maximum current measured during the measurement step during the analysis period is received, the characteristic value of an average of current measurements carried out in the measurement step during the analysis period is calculated, and: - when the maximum current is greater than the maximum current threshold, the determination step determines an undersizing of the electronic cut-off device, otherwise - when the characteristic value is lower than a low value associated with the caliber, the determination step determines an oversizing of the electronic cut-off device, otherwise the determination step determines a good dimensioning of the electronic cut-off device.

[0028] This variant does away with current value ranges per rating, which makes it possible to take into account in particular, when the maximum current is in the current value range of the rating of the electronic cut-off device while the characteristic value is lower than this current value range, the fact that a rating lower than that of the electronic cut-off device is perhaps more appropriate for it.

[0029] The invention also relates to a device for analyzing an electrical network on board a vehicle, the electrical network comprising electronic cut-off devices of different calibers, the analysis device being characterized in that it comprises: - means for measuring a current flowing through one of the electronic cut-off devices when the electronic cut-off device is in an on state, over an analysis period, and - means for determining oversizing, undersizing or correct sizing of the electronic cut-off device in relation to use of the electronic cut-off device over the analysis period, based on a rating of the electronic cut-off device and at least one current measurement carried out by the measuring means.

[0030] The analysis device implements the analysis method according to the invention. It comprises, for example, the control circuit of the electronic cut-off device, as well as the main computer of the vehicle. Optionally, the determination means are included in a server external to the vehicle, communicating with the main computer of the vehicle via a telecommunications unit of the vehicle.

[0031] According to a characteristic of the device for analyzing an electrical network according to the invention, it further comprises means for recording a maximum current measured by the measuring means over the analysis period, and / or means for calculating a characteristic value of an average of current measurements carried out by the measuring means and / or means for calculating a value representative of an average of current measurements carried out by the measuring means in a predetermined range of current values, the determination means comprising: - means for comparing the maximum current with a maximum or minimum current threshold associated with the rating of the electronic cut-off device, and / or - means for comparing the characteristic value of an average of current measurements made by the measuring means with a high value or a low value associated with the rating of the electronic cut-off device, and / or - means for comparing the representative value of an average of current measurements carried out by the measuring means in a predetermined range of current values ​​with a current range corresponding to the rating of the electronic cut-off device.

[0032] The recording means of the analysis device according to the invention comprise, for example, a memory space storing only: - a current value of maximum current and / or - a current value of the integral of the current as measured over all the time intervals during which the electronic cut-off device is conducting, as well as the cumulative duration of these time intervals, and / or - a current value of the integral of the current as measured over all time intervals during which the electronic cut-off device is conducting and is crossed by a current whose value is within the predetermined range of current values, as well as the cumulative duration of these time intervals.

[0033] Preferably, several current values ​​of current integrals are in fact stored, corresponding to different ranges of current values ​​associated with different sizes of electronic cut-off devices.

[0034] The current maximum current value evolves as the measurement step implemented by the analysis device progresses, and becomes, at the end of this measurement step, the maximum current value then usable by the determination means.

[0035] Similarly, the other current values ​​evolve as the measurement step implemented by the analysis device progresses, and allow, at the end of this measurement step or at the start of the determination step implemented by the analysis device, the calculation of the characteristic value and / or the representative value, which can then be used by the determination means.

[0036] In one embodiment of the invention, the determination means are capable of determine : - oversizing of the electronic cut-off device when the representative value is zero while the rating of the electronic cut-off device corresponds to a current range greater than or equal to the predetermined range, or - undersizing of the electronic cut-off device when the representative value is non-zero while the rating of the electronic cut-off device corresponds to a current range lower than the predetermined range.

[0037] In this embodiment of the invention, the means for calculating the representative value are capable of calculating a first value representative of an average of current measurements carried out by the measuring means in a first predetermined range of current values ​​corresponding to the rating of the electronic cut-off member, and a second value representative of an average of current measurements carried out by the measuring means in a second predetermined range of current values ​​greater than the first predetermined range, and the determination means are capable of determining an undersizing of the electronic cut-off member when the second representative value is non-zero, otherwise, a good sizing of the electronic cut-off member when the first representative value is non-zero, otherwise an oversizing of the electronic cut-off member.

[0038] The analysis device according to the invention has advantages similar to those of the analysis method according to the invention.

[0039] Other characteristics and advantages of the invention will become apparent from the following description on the one hand, and from several examples of embodiment given for informational and non-limiting purposes with reference to the attached schematic drawings on the other hand, in which:

[0040] [Fig.l] schematically represents an electrical network on board a vehicle, and an analysis device according to the invention of this on-board electrical network, in one embodiment of the invention,

[0041] [Fig.2] schematically represents steps of an analysis method according to the invention of the on-board electrical network of [Fig.l], in one embodiment of the invention, and

[0042] [Fig.3] schematically represents the evolution of a current passing through an electronic cut-off device of the on-board electrical network of [Fig.l], during an analysis period of the analysis method of [Fig.2].

[0043] In one embodiment of the invention, an electrical network 30 shown [Fig.l], is embedded in a vehicle. It makes it possible to electrically supply electrical consumers C1, C2, C3 of the vehicle, from a so-called service battery 38, with a nominal no-load voltage of, for example, 12V.

[0044] In this electrical network 30, each electrical consumer C1, C2, C3 is individually protected by an electronic cut-off device 32, 34, 36 respectively. These electronic cut-off devices are for example MOSFET transistors of different calibers. A control circuit allows them to be controlled and for this purpose comprises means 12, 14, and 16 for measuring the current passing respectively in the electronic cut-off device 32, 34, and 36.

[0045] The measurements carried out by the measuring means 12, 14, 16 are fed back via an analog / digital converter 18 to a computer 20 of the vehicle, comprising an input port 22, a processor 24 and a memory 26. The communication between the analog / digital converter 18 and the computer 20 is done for example via a CAN bus (from the English “Controller Area Network”).

[0046] An analysis device 1 of the electrical network 30 according to the invention comprises the computer 20 and the measuring means 12, 14, 16. This analysis device 1 is possibly supplemented by a computer external to the vehicle, this computer being able to communicate with the computer 20 in particular to access the memory 26, for example a RAM memory (from the English “Random Access Memory”) or a ROM memory (from the English “Read Only Memory”).

[0047] The analysis device 1 implements a method 100 for analyzing the electrical network 30 according to the invention, shown [Fig.2].

[0048] A first step 110 of the analysis method 100 is the measurement of the currents passing through the electronic cut-off members when these are in the on state over an analysis period p (referenced [Fig. 3]), in particular the measurement of the current I (referenced [Fig. 1]) passing through the electronic cut-off member 32 over the analysis period p when this electronic cut-off member 32 allows current to pass. The processing associated with the electronic cut-off member 32 is now mainly described, but it is understood that similar processing operations are carried out in parallel for the electronic cut-off members 34 and 36.

[0049] Certain data from these measurements are recorded in the memory 26. In particular, the computer 20 stores in the memory 26:

[0050] - a current value of a maximum current flowing through the cut-off device 32 during the analysis period p. This current value successively takes the values ​​0, IM1, IM2 and IM3 as represented in [Fig.3], which shows the current curve I in amperes, as a function of time t over the analysis period p.

[0051] - a current value of the integral of the current I measured over the time intervals for which the cut-off device 32 is conducting, these time intervals being referenced Ton and represented by corresponding double arrows under the abscissa line of [Fig.3]. At the end of the analysis period p, this current value is equal to the area between the current curve I and the abscissa axis of [Fig.3].

[0052] - the cumulative duration of the Ton time intervals.

[0053] Furthermore, in [Fig.3], the analysis period p is divided along the axis of ordered into current ranges, each corresponding to the ratings of the cut-off devices. Thus, the smallest rating corresponds to a first range PI of currents from 0 to 1 ampere, the next rating to a second range P2 of currents from 1 to 2 amperes, the next rating to a third range P3 of currents from 2 to 3 amperes, the next rating to a fourth range P4 of currents from 3 to 4 amperes, the next rating to a fifth range P5 of currents from 4 to 7 amperes, and a final rating corresponds to a sixth range P6 of currents from 7 to 12 amperes.

[0054] The caliber of the electronic cut-off device 32 being associated with the fifth range P5 of currents, in this first measurement step 110, the computer 20 also stores in the memory 26:

[0055] - a current value of the integral of the current I measured over the time intervals "Ton & I>4A" for which the electronic cut-off device 32 is conducting and in the fifth current range P5, as well as the cumulative duration of these time intervals represented by double arrows under the abscissa line. At the end of the analysis period p, this current value is worth the grayed area represented in the current range P5 in [Fig.3].

[0056] - a current value of the integral of the current I measured over the time intervals for which the electronic cut-off member 32 is conducting and in the fourth range P4 of currents, as well as the cumulative duration of these corresponding time intervals.

[0057] - a current value of the integral of the current I measured over the time intervals for which the electronic cut-off device 32 is conducting and in the fourth range P6 of currents, as well as the cumulative duration of these corresponding time intervals. At the end of the analysis period p, this current value is worth the grayed-out area represented in the range P6 of currents in [Fig.3].

[0058] At the end of the measurement step 110, the computer 20 divides the current values ​​of the integrals by the corresponding integration times, and stores in the memory 26 the results of these divisions, corresponding to: - an average of the currents measured over the analysis period p during the intervals Ton, - an average of the currents measured over the analysis period p in the P5 range of currents, - an average of the currents measured over the analysis period p in the P4 range of currents, and - an average of the currents measured over the analysis period p in the P6 range of currents.

[0059] In the same way, at the end of the measurement step 110, the computer 20 uses the data stored in the memory 26 concerning the currents having passed through the cut-off members 34, 36, and deduces therefrom an average of the currents having passed through the cut-off member 34 when the latter was closed, an average of the currents having passed through the cut-off member 36 when the latter was closed, and averages of the currents having passed through the cut-off members 34, 36 over at least some of the ranges P1 to P6, for example the ranges corresponding to their respective ratings and the ranges surrounding these ratings.

[0060] The following step 120 of the analysis method according to the invention is the determination of an oversizing, an undersizing or a good sizing of the electronic cut-off member 32 with respect to its use over the analysis period p. This step 120 is for example implemented on a server external to the vehicle, after receiving the data stored in the memory 26. As a variant, the computer 20 receives (reads) this data and implements this determination step 120.

[0061] During this determination step 120, the external server can use all of this data or only part of this data.

[0062] For example, in this determination step 120, the external server compares the maximum current IM3 measured in step 110 with a maximum current threshold. This maximum current threshold corresponds for example to the limit current supported by the electronic cut-off device 32, and is therefore greater than 7A.

[0063] If the maximum current IM3 is greater than this maximum current threshold, then the analysis device 1 concludes that the electronic cut-off member 32 is undersized. Otherwise, the external server compares the maximum current IM3 measured in step 110 with a minimum current threshold associated with the rating of the electronic cut-off member 32. If the maximum current IM3 is greater than this minimum current threshold, then the analysis device 1 concludes that the electronic cut-off member 32 is correctly sized, otherwise the analysis device 1 concludes that the electronic cut-off member 32 is oversized.

[0064] In another example, in this determination step 120, when the average of the currents measured over the analysis period p in the current range P6 is non-zero, then the external server determines an under-sizing of the electronic cut-off member 32, otherwise, when the average of the currents measured over the analysis period p in the current range P5 is non-zero, then the external server determines a good sizing of the electronic cut-off member 32, otherwise the external server determines an over-sizing of the electronic cut-off member 32.

[0065] In the same way, during step 120 of the analysis method according to the invention, the calculator 20 determines an oversizing, an undersizing or a good sizing of the electronic cut-off device 34 in relation to its use over the analysis period p, and the calculator 20 determines an oversizing, an undersizing or a good sizing of the electronic cut-off device 36 in relation to its use over the analysis period p.

[0066] When at the end of the determination step 120, the external server has determined an oversizing or an undersizing of the electronic cut-off member 32, then the determination step 120 is followed by a step 130 of supplying a range of currents corresponding to a suitable caliber for the electrical consumption of the electrical consumer C1, this range of currents corresponding to the highest predetermined range of current values ​​for which an average of corresponding current measurements is non-zero. In the case of [Fig. 3], this is the range P6 of currents.

[0067] Similarly, if at the end of the determination 120, the external server has determined an oversizing or an undersizing of the electronic cut-off device 34, then the analysis method provides in the following step 130 a range of currents corresponding to a suitable caliber for the electrical consumption of the electrical consumer C2.

[0068] Finally, if at the end of the determination 120, the external server has determined an oversizing or an undersizing of the electronic cut-off device 36, then the analysis method provides in the following step 130 a range of currents corresponding to a suitable caliber for the electrical consumption of the electrical consumer C3.

[0069] Of course, numerous variant embodiments of the invention are conceivable.

[0070] For example, the external server may determine undersizing when the maximum current IM3 is greater than the maximum current threshold or otherwise, when the average of the currents measured over the analysis period p in the current range P6 is greater than a predetermined value. Combining the data from the memory 26 to determine a good or bad calibration of the electronic cut-off device 32 makes it possible to refine this diagnosis. In addition, in order to further refine this diagnosis, the values ​​of the current ranges may depend on the temperature outside the vehicle, and the calculated averages may be quadratic averages.

Claims

Claims

1. Method (100) for analyzing an electrical network (30) on board a vehicle, the electrical network (30) comprising electronic cut-off members (32, 34, 36) of different ratings, the analysis method (100) being characterized in that it comprises: - a step (110) of measuring a current (I) passing through one of the electronic cut-off members (32, 34, 36) when the electronic cut-off member (32, 34, 36) is in an on-state, over an analysis period (p), and - a step (120) of determining an oversizing, an undersizing or a good sizing of the electronic cut-off member (32, 34, 36) with respect to a use of the electronic cut-off member (32, 34, 36) over the analysis period (p), from a rating of the electronic cut-off member (32,34,36) and at least one current measurement from the measurement step (110).

2. Method (100) for analyzing an electrical network (30) according to claim 1, wherein the determining step uses at least: - a comparison of a maximum current (IM3) measured during the measuring step (110) with a maximum or minimum current threshold associated with the rating of the electronic cut-off device (32, 34, 36), and / or - a comparison of a characteristic value of an average of current measurements carried out in the measuring step (110) with a high value or a low value associated with the rating of the electronic cut-off device (32, 34, 36), and / or - a comparison of a value representative of an average of current measurements carried out in the measuring step (110) in a predetermined range (P6) of current values ​​with a current range corresponding to the rating of the electronic cut-off device (32, 34, 36).

3. Method (100) for analyzing an electrical network (30) according to claim 2, characterized in that during the determination step (120), the maximum current (IM3) measured during the measurement step (110) during the analysis period (p) is received, and in that: - when the maximum current (IM3) is greater than the maximum current threshold associated with the rating, the determination step (120) determines an undersizing of the electronic cut-off device (32, 34, 36), - when the maximum current (IM3) is less than the minimum current threshold associated with the rating, the determination step (120) determines a

4.

5.

6. oversizing of the electronic cut-off device (32), and - when the maximum current (IM3) is lower than the maximum current threshold associated with the rating and higher than the minimum current threshold associated with the rating, the determination step (120) determines a correct sizing of the electronic cut-off device (32,34,36). Method (100) for analyzing an electrical network (30) according to claim 2, characterized in that the determining step (120) comprises receiving or calculating the representative value of an average of current measurements carried out in the measuring step (110) in a predetermined range (P6) of current values, and in that: - when the representative value is zero while the rating of the electronic cut-off member (32, 34, 36) corresponds to a current range (P5) greater than or equal to the predetermined range, the determining step (120) determines an oversizing of the electronic cut-off member (32, 34, 36), or - when the representative value is non-zero while the rating of the electronic cut-off member (32, 34, 36) corresponds to a current range (P5) less than the predetermined range (P6), the determining step (120) determines an undersizing of the electronic cut-off member (32,34,36). Method (100) for analyzing an electrical network (30) according to claim 4, characterized in that the determining step (120) comprises receiving or calculating a first value representative of an average of current measurements carried out in the measuring step (110) in a first predetermined range (P5) of current values ​​corresponding to the rating of the electronic cut-off device (32, 34, 36), receiving or calculating a second value representative of an average of current measurements carried out in the measuring step (110) in a second predetermined range (P6) of current values ​​greater than the first predetermined range (P5), and in that when the second representative value is non-zero, then the determining step (120) determines an undersizing of the electronic cut-off device (32, 34, 36), otherwise, when the first representative value is non-zero,then the determination step (120) determines a good dimensioning of the electronic cut-off member (32,34,36), otherwise the determination step (120) determines an overdimensioning of the electronic cut-off member (32,34,36)., Method for analyzing (100) an electrical network (30) according to the res indication 5, characterized in that when the determining step (120) determines an oversizing or an undersizing of the electronic cut-off member (32, 34, 36), then the determining step (120) also determines a higher predetermined range (P6) of current values ​​for which a corresponding average of current measurements is non-zero, and the determining step (120) is followed by a step of providing (130) a value representative of a caliber associated with this higher predetermined range (P6) of current values.

7. Analysis device (1) for an electrical network (30) on board a vehicle, the electrical network (30) comprising electronic cut-off devices (32, 34, 36) of different calibers, the analysis device (1) being characterized in that it comprises: - measuring means (12, 14, 16) of a current (I) passing through one of the electronic cut-off members (32, 34, 36) when the electronic cut-off member (32, 34, 36) is in a passing state, over an analysis period (p), and - means for determining (24) oversizing, undersizing or correct sizing of the electronic cut-off device (32, 34, 36) with respect to use of the electronic cut-off device (32, 34, 36) over the analysis period (p), from a rating of the electronic cut-off device and (32, 34, 36) from at least one current measurement carried out by the measuring means (12, 14, 16).

8. An analysis device (1) for an electrical network (30) according to claim 7, further comprising means (26) for recording a maximum current (IM3) measured by the measuring means (12, 14, 16) over the analysis period (p), and / or means for calculating a characteristic value of an average of current measurements carried out by the measuring means (12, 14, 16) and / or means for calculating a value representative of an average of current measurements carried out by the measuring means (12, 14, 16) in a predetermined range (P6) of current values, the determination means comprising: - means for comparing the maximum current (IM3) with a maximum or minimum current threshold associated with the rating of the electronic cut-off device (32,34,36), and / or - means for comparing the characteristic value of an average of current measurements made by the measuring means (12, 14, 16) with a high value or a low value associated with the rating of the electronic cut-off device (32, 34, 36), and / or - means for comparing the value representative of an average of current measurements carried out by the measuring means (12, 14, 16) in a predetermined range (P6) of current values ​​with a current range corresponding to the rating of the electronic cut-off device (32, 34, 36).

9. Analysis device (1) of an electrical network (30) according to claim 8, in which the determination means (24) are capable of determining: - an oversizing of the electronic cut-off member (32,34,36) when the representative value is zero while the rating of the electronic cut-off member (32,34,36) corresponds to a current range (P5) greater than or equal to the predetermined range, or - an undersizing of the electronic cut-off member (32,34,36) when the representative value is not zero while the rating of the electronic cut-off member (32,34,36) corresponds to a current range (P5) less than the predetermined range (P6).

10. An analysis device (1) for an electrical network (30) according to claim 9, in which the calculation means (24) of the representative value are capable of calculating a first value representative of an average of current measurements carried out by the measurement means (12, 14, 16) in a first predetermined range (P5) of current values ​​corresponding to the rating of the electronic cut-off member (32, 34, 36), and a second value representative of an average of current measurements carried out by the measurement means (12, 14, 16) in a second predetermined range (P6) of current values ​​greater than the first predetermined range (P5), and in which the determination means (24) are capable of determining an undersizing of the electronic cut-off member (32, 34, 36) when the second representative value is non-zero, otherwise, a good sizing of the electronic cut-off member (32, 34,36) when the first representative value is non-zero, otherwise an oversizing of the electronic cut-off device (32,34,36).,

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