Method and device for analysing an electrical network on board a vehicle
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- AMPERE SAS
- Filing Date
- 2024-07-08
- Publication Date
- 2026-05-20
AI Technical Summary
The existing electrical network in vehicles often results in oversized transistors, leading to unnecessary costs and reduced lifespan due to incorrect sizing during design, which is not accurately reflected by pre-production evaluations.
A method and device for analyzing the electrical network on board a vehicle that measures current usage over an analysis period to determine if transistors are oversized, undersized, or correctly sized, using thresholds and averages to provide precise diagnosis and adjust sizing accordingly.
Enables correction of transistor sizing in real-world conditions, reducing unnecessary costs and extending transistor lifespan by accurately assessing usage patterns and adjusting transistor ratings based on actual current demands.
Smart Images
Figure EP2024069246_16012025_PF_FP_ABST
Abstract
Description
Description Title of the invention: Method and device for analyzing an electrical network embedded in a vehicle
[0001] The present invention relates to the fields of electricity and automobiles, and more specifically concerns a method and device for analyzing an electrical power supply network embedded in a vehicle.
[0002] Such an electrical supply network generally includes a fuse box connected on one side to a vehicle service battery, with a nominal open-circuit voltage generally of around 12V (volts), and on the other side to one or more distribution boxes containing power transistors to supply the vehicle's electrical consumers.
[0003] These power transistors, called electronic switching components or "SmartMOS" chips, as they are known in English, contain one or more transistors, such as MOSFETs (metal-oxide-semiconductor field-effect transistors), controlled by a driver circuit that can open a short circuit in 10 microseconds to 10 milliseconds. These new components therefore have the advantage of meeting the safety requirements of automobiles, particularly those with a significant software component. However, these components are expensive, especially given the high current they can handle.
[0004] However, the electrical network of such a vehicle can include 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 vehicle's on-board electrical network come in different categories, including transistors capable of supporting a direct current ranging from 0 to 1 A (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 in the onboard electrical system. Indeed, an oversized transistor for powering an electrical load represents an unnecessary additional cost, and an undersized transistor for that power supply will have a lifespan that is too short compared to the estimated lifespan of the vehicle.
[0007] The sizing of transistors in the vehicle's onboard electrical system is determined during the design phase, by independently evaluating the power consumption of each electrical component and 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 embedded in a vehicle, which allows the sizing of the electrical network of a vehicle to be corrected by using data related to the use of the vehicle's electrical consumers.
[0009] To this end, the invention proposes a method for analyzing an electrical network embedded in a vehicle, the electrical network comprising electronic switching devices of different sizes, the analysis method being characterized in that it comprises: - a step of measuring the current flowing through one of the electronic switching devices when the electronic switching device is in a conducting state, over an analysis period, and - a step to determine whether the electronic switching device is oversized, undersized or properly sized in relation to the use of the electronic switching device over the analysis period, based on a rating of the electronic switching device and at least one current measurement from the measurement step.
[0010] The measurement step takes place during vehicle use over the analysis period, and the determination step takes place after the analysis period, either in the vehicle's computer or on a computer located away 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 sizing of the electrical network for use on a vehicle of the same type before its mass production.
[0011] Preferably, the procedure includes a current measurement for each electronic switching device in the vehicle's electrical system, and a determination for each of these devices whether it is oversized, undersized, or correctly sized relative to its use over the analysis period. The electronic switching devices are preferably transistors, for example, MOSFET transistors.
[0012] Furthermore, current measurement preferably takes place only when the electronic switching device is in the conducting state, in order to limit the data to be processed.
[0013] According to one feature of the analytical 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 switching device, and / or - a comparison of a characteristic value of an average of current measurements taken at the measurement stage with a high value or a low value associated with the caliber of the electronic switching device, and / or - a comparison of a representative value of an average of current measurements carried out at the measurement stage in a predetermined range of current values with a current range corresponding to the rating of the electronic switching device.
[0014] The maximum current measured during the analysis period makes it easy to see if the size of the electronic switching device is suitable, because if it exceeds the maximum current threshold corresponding to the maximum current that the electronic switching device can withstand, then the electronic switching device is undersized.
[0015] The characteristic value of the average current measurements can also detect undersizing if this average is higher than the upper limit of the electronic circuit breaker's rating. The characteristic value is, for example, an arithmetic mean or a root mean square. A current margin may be added or subtracted from this value, depending in particular on the expected lifespan of the electronic circuit breaker relative to its intended use.
[0016] The representative value of an average of current measurements taken during the measurement stage within a predetermined range of current values is also, for example, an arithmetic mean or a root mean square of the current measurements over the analysis period, performed for current measurements whose values fall within the current range of a specific electronic switching device rating. This current range corresponds to the rating of the electronic switching device being analyzed, or to a rating lower or higher than this rating. Optionally, a current margin is added to or subtracted from this current range, depending, in particular, on the expected lifespan of the electronic switching device in relation to its intended use. This representative value is directly linked to a given electronic switching device rating and therefore allows for a precise diagnosis of the electronic switching device's sizing.
[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 exceeds the maximum current threshold associated with the rating, the determination step results in an undersizing of the electronic switching device. - when the maximum current is lower than the minimum current threshold associated with the rating, the determination step results in an oversizing of the electronic switching device, and - when the maximum current is less than the maximum current threshold associated with the rating and greater than the minimum current threshold associated with the rating, the determination step determines a good sizing of the electronic switching device.
[0018] In this embodiment of the invention, only the maximum current measured over the analysis period is used to analyze the sizing of the electronic switching element, which requires recording only one current measurement per electronic switching element.
[0019] In another embodiment of the invention, the determination step comprises receiving or calculating the representative value of an average of current measurements taken during the measurement step within a predetermined range of current values, and: - when the representative value is zero while the rating of the electronic switching device corresponds to a current range greater than or equal to the predetermined range, the determination step determines an oversizing of the electronic switching device, or - when the representative value is non-zero while the rating of the electronic switching device corresponds to a current range lower than the predetermined range, the determination step determines an undersizing of the electronic switching device.
[0020] In this alternative embodiment of the invention, for example, the integral of the current measured over all time intervals during which the electronic switching device is conducting and carrying a current within the predetermined range of current values, as well as the cumulative duration of these time intervals, is saved for the electronic switching device before the determination step. In other words, not all current measurements taken by the control circuit of the electronic switching device are recorded, but only a cumulative total of some of these measurements, performed dynamically during the measurement step. This allows for a more detailed analysis of the switching device's usage over the analysis period while limiting the amount of data to be processed. The calculation of the average of the measurements is then performed, for example, during the determination step, or at the end of the measurement step.
[0021] It should be noted that the predetermined range can correspond to several gauges, for example, all gauges above the gauge of the electronic cutoff device, or all gauges below the gauge of the electronic cutoff device. Furthermore, the representative value is optionally adapted to a temperature measured outside the vehicle, specifically to account for 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 electronic switching devices related to heating and defrosting systems, while in summer the representative value is for example the average of measurements reduced by a current margin for electronic switching devices related to cooling systems.
[0023] The current margin varies depending on temperature ranges. For example, in winter, the current margin applied to electronic switching devices for heating and defrosting systems is high if the outside temperature is below -10°C (degrees Celsius), slightly lower if the outside temperature is between -10°C and 10°C, and zero when the outside temperature is between 10°C and 25°C. Similarly, in summer, the current margin applied to electronic switching devices for cooling systems is zero when the outside temperature is between 10°C and 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 receiving or calculating a first representative value of an average of current measurements taken at the measurement step within a first predetermined range of current values corresponding to the rating of the electronic switching device, receiving or calculating a second representative value of an average of current measurements taken at the measurement step within a second predetermined range of current values higher than the first predetermined range, and when the second representative value is non-zero, then the determination step determines an undersizing of the electronic switching device; otherwise, when the first representative value is non-zero, then the determination step determines a correct sizing of the electronic switching device.Otherwise, the determination step results in an oversized electronic switching device.
[0025] Preferably still, in this other embodiment of the invention, when the determination step determines an oversizing or undersizing of the electronic switching element, then the determination step also determines a higher predetermined range of current values for which a corresponding average current measurement is non-zero, and the determination step is followed by a step of supplying a representative value of a gauge associated with this higher predetermined range of current values.
[0026] Thus, the analysis method according to the invention provides a calibration value enabling correction of an undersizing or oversizing of the electronic switching element.
[0027] Of course, alternative embodiments using combinations of data recorded at the measurement stage in these different embodiments are possible. For example, in the alternative, at the determination stage, the maximum current measured at the measurement stage during the analysis period is received, the characteristic value of an average of current measurements taken at the measurement stage 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 switching device, otherwise - when the characteristic value is less than a low value associated with the caliber, the determination step determines an oversizing of the electronic cutting element, otherwise the determination step determines a good sizing of the electronic cutting element.
[0028] This variant does not require current value ranges per size, which allows us to take into account, in particular, when the maximum current is within the current value range of the size of the electronic switching device while the characteristic value is below this current value range, the fact that a size lower than that of the electronic switching device may be more appropriate for it.
[0029] The invention also relates to a device for analyzing an electrical network embedded in a vehicle, the electrical network comprising electronic switching devices of different sizes, the analysis device being characterized in that it comprises: - means for measuring the current flowing through one of the electronic switching devices when the electronic switching device is in a conducting state, over an analysis period, and - means of determining oversizing, undersizing or proper sizing of the electronic switching device in relation to the use of the electronic switching device over the analysis period, based on a rating of the electronic switching 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 includes, for example, the control circuit for the electronic cut-off device, as well as the vehicle's main computer. Optionally, the determination means are contained in a server external to the vehicle, communicating with the vehicle's main computer via a telecommunications unit in the vehicle.
[0031] According to a characteristic of the device for analyzing an electrical network according to The invention 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 taken by the measuring means, and / or means for calculating a representative value of an average of current measurements taken by the measuring means within a predetermined range of current values, the determination means comprising: - means of comparing the maximum current with a maximum or minimum current threshold associated with the rating of the electronic switching device, and / or - means of comparing the characteristic value of an average of current measurements taken by the measuring means with a high or low value associated with the rating of the electronic switching device, and / or - means of 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 switching device.
[0032] The recording means of the analysis device according to the invention include, 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 time intervals during which the electronic switching 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 switching device is conducting and through which a current flows whose value is within the predetermined range of current values, as well as the cumulative duration of these time intervals.
[0033] Preferably several current integral values are actually stored, corresponding to different ranges of current values associated with different sizes of electronic switching devices.
[0034] The current value of maximum current evolves as the measurement step implemented by the analysis device progresses, and at the end of this measurement step, becomes the maximum current value that can then be used 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 beginning 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 suitable for determine : - an oversizing of the electronic switching device when the representative value is zero while the rating of the electronic switching device corresponds to a current range greater than or equal to the predetermined range, or - an undersizing of the electronic switching element when the representative value is non-zero while the rating of the electronic switching element 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 representative value of an average of current measurements taken by the measuring means in a first predetermined range of current values corresponding to the rating of the electronic switching element, and a second representative value of an average of current measurements taken by the measuring means in a second predetermined range of current values higher than the first predetermined range, and the means for determining an undersizing of the electronic switching element when the second representative value is non-zero, otherwise, a good sizing of the electronic switching element when the first representative value is non-zero, otherwise an oversizing of the electronic switching element.
[0038] The analysis device according to the invention has advantages similar to those of the analysis method according to the invention.
[0039] Other features and advantages of the invention will become apparent from the following description on the one hand, and from several illustrative and non-limiting examples of embodiments given with reference to the attached schematic drawings on the other hand, in which:
[0040] [Fig. 1] schematically represents an electrical network embedded in a vehicle, and an analysis device according to the invention for this embedded electrical network, in one embodiment of the invention.
[0041] [Fig. 2] schematically represents steps in an analysis process according to the invention of the on-board electrical network of [Fig. 1], in one embodiment of the invention, and
[0042] [Fig.3] schematically represents the evolution of a current passing through an electronic switching device of the on-board electrical network of [Fig.1], during a period of analysis of the analysis process of [Fig.2].
[0043] In one embodiment of the invention, an electrical network 30, shown [Fig. 1], is installed in a vehicle. It provides electrical power to electrical consumers C1, C2, C3 of the vehicle, from a battery 38, referred to as a service battery, with a nominal open-circuit voltage, for example, of 12V.
[0044] In this electrical network 30, each electrical consumer C1, C2, C3 is individually protected by an electronic switching device 32, 34, 36 respectively. These electronic switching devices are, for example, MOSFET transistors of different ratings. A control circuit allows them to be operated and includes, for this purpose, measuring means 12, 14, and 16 for the current flowing respectively through the electronic switching device 32, 34, and 36.
[0045] The measurements taken by the measuring means 12, 14, 16 are sent 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. 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 optionally 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 an analysis method 100 of the electrical network 30 according to the invention, represented [Fig.2],
[0048] A first step 110 of the analysis procedure 100 is the measurement of the currents flowing through the electronic switching elements when they are in the conducting state over an analysis period p (referenced [Fig. 3]), specifically the measurement of the current I (referenced [Fig. 1]) flowing through the electronic switching element 32 over the analysis period p when this electronic switching element 32 conducts current. The processing associated with the electronic switching element 32 is now primarily described, but it is understood that similar processing is carried out in parallel for the electronic switching elements 34 and 36.
[0049] Some data from these measurements is recorded in memory 26. In particular, the calculator 20 stores the following in memory 26:
[0050] - a current value of a maximum current through the switching element 32 during the analysis period p. This current value successively takes the values 0, IM1, IM2 and IM3 as represented on the [Fig.3], which shows the curve of current 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 switching element 32 is conducting, these time intervals being referenced Ton and represented by corresponding double arrows below the x-axis 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 x-axis of [Fig.3].
[0052] - the cumulative duration of the time intervals Ton.
[0053] Furthermore, in [Fig.3], the analysis period p is divided along the ordinate axis into current ranges, each corresponding to a specific size of switching device. Thus, the smallest size corresponds to a first range PI of currents from 0 to 1 amp, the next size to a second range P2 of currents from 1 to 2 amps, the next size to a third range P3 of currents from 2 to 3 amps, the next size to a fourth range P4 of currents from 3 to 4 amps, the next size to a fifth range P5 of currents from 4 to 7 amps, and a final size corresponds to a sixth range P6 of currents from 7 to 12 amps.
[0054] Since the range of the electronic switching device 32 is associated with the fifth current range P5, in this first measurement step 110, the calculator 20 also stores in 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 switching element 32 is conducting and in the fifth current range P5, as well as the cumulative duration of these time intervals represented by double arrows below the x-axis. At the end of the analysis period p, this current value equals the shaded area shown 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 switching element 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 switching element 32 is conducting and in the fourth current range P6, as well as the cumulative duration of these corresponding time intervals. At the end of the analysis period p, this current value is equal to the shaded area shown in the current range P6 in [Fig.3],
[0058] At the end of measurement step 110, the calculator 20 divides the current values of the integrals by the corresponding integration times, and stores the results of these divisions in memory 26, 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 within the current range P5, - an average of the currents measured over the analysis period p within the current range P4, and - an average of the currents measured over the analysis period p in the range P6 of currents.
[0059] Similarly, at the end of measurement step 110, the calculator 20 uses the data stored in memory 26 concerning the currents that have passed through the switching elements 34, 36, and deduces an average of the currents that have passed through the switching element 34 when it was closed, an average of the currents that have passed through the switching element 36 when it was closed, and averages of the currents that have passed through the switching elements 34, 36 over at least some of the ranges PI to P6, for example the ranges corresponding to their respective sizes and the ranges framing these sizes.
[0060] The next step 120 of the analysis method according to the invention is the determination of an oversizing, an undersizing or a correct sizing of the electronic cutting element 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. Alternatively, 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 switching 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 switching device 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 switching device 32. If the maximum current IM3 is greater than this minimum current threshold, then the analysis device 1 concludes that the electronic switching device 32 is correctly sized; otherwise, the analysis device 1 concludes that the electronic switching device 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 undersizing of the electronic switching element 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 switching element 32, otherwise the external server determines an oversizing of the electronic switching element 32.
[0065] Similarly, during step 120 of the analysis process according to the invention, the calculator 20 determines an oversizing, an undersizing, or a good sizing of the electronic switching element 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 switching element 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 that the electronic switching device 32 is oversized or undersized, then the determination step 120 is followed by a supply step 130 of a current range corresponding to a suitable rating for the electrical consumption of the electrical consumer Cl. This current range corresponds to the highest predetermined range of current values for which a corresponding average current measurement is non-zero. In the case of [Fig. 3], this is the current range P6.
[0067] Similarly, if at the end of the determination 120, the external server has determined an oversizing or undersizing of the electronic switching device 34, then the analysis process provides in the next step 130 a range of currents corresponding to an appropriate rating 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 undersizing of the electronic switching device 36, then the analysis process provides in the next step 130 a range of currents corresponding to an appropriate rating for the electrical consumption of the electrical consumer C3.
[0069] Of course, many variations in the implementation of the invention are conceivable.
[0070] For example, the external server can detect undersizing when the maximum current IM3 exceeds the maximum current threshold, or alternatively, when the average of the currents measured over the analysis period p within the current range P6 exceeds a predetermined value. Combining the data from memory 26 to determine whether the electronic cutoff device 32 is properly calibrated allows for a more precise diagnosis. Furthermore, to refine this diagnosis even further, the current range values can be adjusted according to the vehicle's ambient temperature, and the calculated averages can be root mean squares.
Claims
Claims
1. Method for analyzing (100) 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 method (100) being characterized in that it comprises: - a step of measuring (110) 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 - a step of determining (120) 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 for analyzing (100) an electrical network (30) according to claim 1, in which the determining step uses at least: - a comparison of a maximum current (I M3 ) measured during the measurement 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 measurement 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 lower than the minimum current threshold associated with the rating, the determination step (120) determines a 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).
4. Method (100) for analyzing an electrical network (30) according to claim 2, characterized in that the determining step (120) comprises receiving or calculating the value representative 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 device (32, 34, 36) corresponds to a current range (P5) greater than or equal to the predetermined range, the determination step (120) determines an oversizing of the electronic cut-off device (32, 34, 36), or - when the representative value is non-zero while the rating of the electronic cut-off device (32,34,36) corresponds to a current range (P5) lower than the predetermined range (P6), the determination step (120) determines an undersizing of the electronic cut-off device (32,34,36).
5. Method (100) for analyzing an electrical network (30) according to claim 4, characterized in that the determining step (120) comprises a reception or a calculation of 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), a reception or a calculation of 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).,
6. Method for analyzing (100) an electrical network (30) according to re- 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 of comparing the maximum current (I M3 ) 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 caliber 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: - oversizing of the electronic cut-off device (32.34.36) when the representative value is zero while the rating of the electronic cut-off device (32,34,36) corresponds to a current range (P5) greater than or equal to the predetermined range, or - undersizing of the electronic cut-off device (32.34.36) when the representative value is non-zero while the rating of the electronic cut-off device (32,34,36) corresponds to a current range (P5) lower than the predetermined range (P6).
10. Analysis device (1) of 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 device. (32.34.36), and a second value representative of an average of current measurements carried out by the measuring means (12, 14, 16) in a second predetermined range (P6) of current values greater than the first predetermined range (P5), and in which the determining 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 member (32,34,36).