System and method for estimating the height of a seat user and a method for manufacturing such a system

Abstract

The invention relates to a system (1) for estimating the height of a seat user (10). The estimation system (1) comprises: the seat (10) including a seat (12) and a backrest (11); at least one first pressure sensor (21) arranged in the backrest (11) at a first height relative to the seat (12), the first height being adapted so that the first pressure sensor (11) is subjected to the pressure of the user's back only when the user is taller than a first predefined height; a processing unit (40) configured to determine an estimated value of the user's height based on a first pressure value provided by the first pressure sensor (11). The invention further relates to a method for manufacturing and a method for estimating the height of a seat user. Figure for the abstract: Figure 1

Description

Title of the invention: System and method for estimating the height of a seat user and a method for manufacturing such a system. Technical field

[0001] The invention relates to the field of seat equipment and interfacing, such as vehicle seats.

[0002] The invention thus relates more specifically to a system for estimating the height of a seat user, a method for manufacturing such a system and a method for estimating the height of a seat user. Prior state of the art

[0003] In order to optimize the ergonomics and / or safety of the space associated with a certain seat, it may be necessary to estimate the height of the seat's user. While this is particularly relevant in the context of motor vehicles, where the configuration of the safety airbag and certain vehicle controls can be adapted to the user's height, this type of information can be applied to other spaces, such as a workspace, for example, by adjusting the height of a desk and / or chair to the user's height.

[0004] Currently, and in accordance with the teaching of documents US 7630804 and WO 2016 / 164793, the estimation of the size of a seat user is generally carried out from an imaging system, such as one or more cameras arranged near the central rearview mirror of a vehicle.

[0005] While such an estimation provides a relatively reliable estimate of a seat user's height, it is not always feasible and requires additional information about the seat's configuration relative to the imaging system. Ideally, the camera(s) comprising the imaging system should be installed facing the seat and, in any case, at a distance from it. Therefore, it is not possible to provide a height estimation system that can be directly integrated into the seat and thus be independent of the other elements of the space in which the seat is located. Furthermore, these systems require information regarding the seat's configuration relative to the imaging system (seat height, distance between the seat and the camera(s), etc.).

[0006] Thus, systems for estimating the size of a seat user such as those proposed by US patents 7630804 and WO2016 / 164793 can be relatively complex to implement and are not necessarily suitable for all spaces where Such an estimation of a user's size would be necessary. Description of the invention

[0007] The invention aims to remedy at least some of these drawbacks and thus aims to provide a user height estimation system that is simpler to implement than an estimation system proposed by the prior art and which allows, at least in certain configurations, an implementation that does not require any element external to the seat.

[0008] The invention relates to a system for estimating the height of a seat user, the estimation system comprising: - the seat comprising a seat and a backrest to respectively accommodate the user's buttocks and back, - at least one first pressure sensor arranged in the backrest at a first height relative to the seat, the first height being adapted so that the first pressure sensor is subjected to the pressure of the user's back only when the latter is taller than a first predefined height, the first pressure sensor being capable of providing a first pressure value corresponding to the forces exerted by the pressure of the user's back on the first pressure sensor, - a processing unit configured to determine an estimated value of the user's size based on said first pressure value.

[0009] Such a height estimation system allows for obtaining an estimated value of the user's height, such as, for example, a status value indicating whether the user's estimated height is greater than or equal to the predefined height, without necessarily requiring any elements other than those integrated into the seat, since the first pressure sensor is integrated into the backrest and the processing unit can, if necessary, be integrated either into the backrest or the seat. Integration is therefore simplified compared to prior art systems that require a camera external to the seat.

[0010] Moreover, when the system is based solely on pressure measurements, it does not require additional information, such as seat configuration and the distance between the seat and an external element (the camera) as is the case for prior art systems.

[0011] It should be noted that in this document and in accordance with the understanding generally given to it, the term "back" of the user means the rear part of the user's trunk including the hips and shoulders.

[0012] Similarly, by "first pressure sensor subjected to the pressure of the user's back only when the latter is larger than a first predefined size", it is understood that there is a threshold size, the first predefined size, at From this point, on average, the user's back will exert forces on the first sensor exceeding a threshold value. Thus, according to this possibility, this threshold value will correspond to an initial pressure threshold value from which it can be estimated that the user's height exceeds said threshold height, that is to say, the first height.

[0013] Such a first threshold pressure value can be, for example, a value equal to 2.5 g.cm2, or even to 5 g.cm2.

[0014] It should be noted that the first size can be greater than 1.60 m, or even 1.65 m, or even 1.70 m or 1.75 m.

[0015] The estimation system may further include a second pressure sensor arranged in the backrest at a second height relative to the seat, the second height being lower than the first height in such a way that the second sensor is subjected to the pressure of the user's back when the latter is shorter than the first height, the second pressure sensor being able to provide a second pressure value corresponding to the forces exerted by the pressure of the user's back on the second pressure sensor, the processing unit being configured to determine the estimation value of the user's height on the basis of the second pressure value.

[0016] With such a second sensor, it is possible to obtain a relatively accurate estimation value of the user's height, since the two sensors make it possible to provide representative values ​​of the user's back support at distinct heights corresponding to two respective user heights.

[0017] Similarly, by "second height relative to the seat, the second height being lower than the first height in such a way that the second sensor is subjected to the support of the user's back when the latter is shorter than the first height," it is understood that for a user shorter than the first threshold height, the user's back is likely to apply forces on the second sensor exceeding a second threshold pressure value. Of course, just as with the first sensor, there may be a threshold height, lower than the first predefined height, above which, on average, the user's back will apply forces on the second sensor exceeding the second threshold pressure value.

[0018] Said second threshold pressure value may be, for example, a value equal to 1.5 g.cm 2, or even to 2.5 g.cm 2.

[0019] The estimation system may further include a third pressure sensor arranged in the backrest at a third height relative to the seat, the third height being distinct from the first and second heights and being adapted so that the third pressure sensor is subjected to the pressure of the user's back, the a third pressure sensor capable of providing a third pressure value corresponding to the forces exerted by the user's back against the third pressure sensor, the processing unit being configured to determine the estimated value of the user's size based on, in addition, the third pressure value.

[0020] With such a third pressure value provided by the third pressure sensor, the processing unit is able to provide a particularly precise estimation value, having at its disposal, thanks to the third pressure sensor, a reference pressure value of the forces applied by the user's back.

[0021] the first pressure sensor can be arranged in the backrest in correspondence to an average support point of a shoulder of users having a height within a first size range whose sizes are greater than or equal to the first size, the second pressure sensor being arranged in the backrest in correspondence to an average support point of a shoulder of users having a height within a second size range smaller than at least part, or even all, of the sizes in the first size range.

[0022] In this way, with the first and second pressure sensors arranged in relation to two very distinct user size ranges, the pressure values ​​obtained will be particularly suitable for providing a size estimation value allowing good discrimination between users of these two size ranges.

[0023] The estimation system may further include an imaging system arranged such that at least an upper part of the backrest, intended to receive the head or a shoulder of the user, is in the field of vision of the imaging system, the imaging system being adapted to capture at least one first image of the user installed in the seat, the processing unit being configured to determine the estimation value of the user's size on the basis of further an image analysis carried out from at least one first image.

[0024] Such a method of estimating size, complementary to pressure sensors, allows for a more precise estimation of the size value. Furthermore, given the use of pressure values ​​provided by at least one pressure sensor, the constraints related to image analysis, particularly those concerning knowledge of the seat configuration, are reduced. Consequently, the estimation system remains simpler compared to prior art systems, which rely solely on the use of imaging.

[0025] The estimation system may further include a fourth pressure sensor arranged in the seat, the fourth sensor being capable of providing a fourth pressure value corresponding to the forces exerted by the user's buttocks on the fourth pressure sensor, the processing unit is further configured to determine an estimated value of the user's weight based on the fourth pressure value.

[0026] In this way, the system is also able to provide an estimated value for the user's weight. Such information is particularly useful for optimizing the ergonomics of the seat and / or the space in which the seat is arranged with respect to the user's morphology.

[0027] The processing unit can further be configured to determine the estimated value of the user's weight based on, in addition to, a pressure value measured at the backrest level, such as the first pressure value.

[0028] In this way, the estimated value of the user's weight makes it possible to take into account the support provided by the backrest in the context of taking into account the forces applied by the user's buttocks to the fourth pressure sensor.

[0029] The seat can be fitted to a vehicle.

[0030] Such a seat is particularly suitable for such equipment since it allows the ergonomics of the vehicle to be adapted to the morphology of the user.

[0031] The invention further relates to a method for manufacturing a system for estimating the height of a seat user, the method comprising the following steps: - provision of the seat comprising a seat and a backrest to respectively accommodate the buttocks and back of the user, said seat having a first pressure sensor arranged in the backrest at a first height relative to the seat, the first height being adapted so that the first pressure sensor is subjected to the pressure of the user's back only when the latter is taller than a first predefined height, the first pressure sensor being capable of providing a first pressure value corresponding to the forces exerted by the pressure of the user's back on the first pressure sensor, - provision of a processing unit configured to determine an estimated value of the user's size based on said first pressure value.

[0032] Such a method allows the provision of an estimation system according to the invention and therefore to benefit from the advantages associated therewith.

[0033] When supplying the seat, the seat may have a second pressure sensor arranged in the backrest at a second height relative to the seat, the second height being lower than the first height, in such a way that the second sensor is subjected to the pressure of the user's back when the latter is shorter than the first height, the second pressure sensor being capable of providing a second pressure value corresponding to the forces exerted by the pressure of the user's back on the second pressure sensor, and During the stage of supplying the processing unit, a sub-stage may be planned calibration to determine a relationship between at least the first and second pressure values ​​provided by the first and second pressure sensors and a user size value installed in the seat, and a processing unit configuration substep to implement the relationship determined during the calibration substep to determine the user size estimate value based on at least the first and second pressure values.

[0034] Such use of two pressure sensors arranged in the case in association with such a calibration sub-step, allows the manufacture of an estimation system capable of providing a particularly accurate size value estimate.

[0035] When supplying the seat, the seat may further have a fourth pressure sensor arranged in the seat, the fourth sensor being capable of providing a fourth pressure value corresponding to the forces exerted by the user's buttocks on the fourth pressure sensor; when supplying a processing unit, the processing unit may further be configured to determine an estimate of the user's weight based on the fourth pressure value.

[0036] In this way, the system is able to provide an estimated value of the user's weight.

[0037] The invention further relates to a method for estimating the height of a seat user, the seat may include a seat and a backrest to accommodate the user's buttocks and back respectively, the method comprising the following steps: - measurement of at least one initial pressure value corresponding to the forces exerted by the user's back against the backrest, at a first height of the backrest, the first height being chosen in such a way that the user's back applies pressure at said first height only when the user is taller than a predefined height, - determination of an estimated value for the user's size based on said first pressure value.

[0038] Such a method makes it possible to provide a size estimation value with an estimation system according to the invention and therefore to benefit from the advantages associated with it.

[0039] The method for estimating the height of a seat user may further include a step of measuring at least a second pressure value corresponding to the forces exerted by the user's back against the backrest, at a second height of the backrest, the second height being chosen to be lower than the first such that the user's back applies pressure at said second height when the user is shorter than the first height, and wherein, during the step of determining the height estimate value of the user, the said determination is carried out on the basis of the said second pressure value.

[0040] In this way the value provided by the estimation process makes it possible to provide a more refined size estimation value.

[0041] The method for estimating the size of a seat user may further include the following steps: - measurement of at least a fourth pressure value corresponding to the forces exerted by the user's buttocks at a specific location on the seat, - determination of an estimated value for the user's weight based on the fourth pressure value.

[0042] With such a capability of the method, it is also possible to estimate the user's weight and therefore, from their height and weight, to estimate the user's morphology. Such an estimation of morphology allows for a good adaptation of the ergonomics of the seat and the space in which it is installed to said morphology.

[0043] It may also be provided for a step of adjusting the seat from the determined weight estimate value.

[0044] In this way, it is possible to adapt the ergonomics of the seat to the vase of the size estimation value. Brief description of the drawings

[0045] The present invention will be better understood upon reading the description of exemplary embodiments, given purely by way of illustration and in no way limiting, with reference to the accompanying drawings in which:

[0046] [Fig-1] illustrates a system for estimating the height of a seat user according to a first embodiment of the invention,

[0047] [Fig.2] graphically illustrates, in greyscale, the average distribution of efforts exerted by the pressure of the user's back against the back of a seat, the locations of a first, second, and third pressure sensor according to the first embodiment of the invention being shown in relation to these forces,

[0048] [Fig.3] graphically illustrates, in greyscale, the average distribution of efforts exerted by the pressure of the user's buttocks on the seat, the locations of a fourth, fifth, and sixth pressure sensor according to the first embodiment of the invention being shown in relation to these forces,

[0049] [Fig.4] graphically illustrates, in greyscale, the average distribution of efforts exerted by the pressure of the user's back against the back of a seat, the locations of five pressure sensors according to a second embodiment of the invention being shown in relation to these forces,

[0050] [Fig.5] graphically illustrates, in greyscale, the average distribution of efforts exerted by the pressure of the user's buttocks on the seat of a chair, the locations of five pressure sensors, according to a third embodiment being shown in relation to these efforts.

[0051] Identical, similar or equivalent parts of the different figures bear the same numerical references so as to facilitate the transition from one figure to another.

[0052] The different parts represented in the figures are not necessarily shown on a uniform scale, in order to make the figures more legible.

[0053] The different possibilities (variants and embodiments) should be understood as not being mutually exclusive and can be combined. Description of embodiments

[0054] Fig. 1 illustrates a system for estimating the size of a user of a seat 10 according to the invention, and more specifically according to a first embodiment of the invention, which allows the estimation of the size of a user on the basis of the use of at least a first pressure sensor 21 arranged in a backrest 11 of said seat 10.

[0055] Such a seat 10 is a seat with a backrest 11 comprising a seat 12 and a backrest 11 to accommodate the user's buttocks and back respectively. The seat 10 can be either a seat in a vehicle, such as a motor vehicle, a public transport vehicle, or an aircraft, or a seat for sedentary use, such as an office chair or massage chair. First embodiment of the invention

[0056] For the seat 10, each of the seat 12 and of the backrest 11, has a covering and a trim, the covering allowing the trim to be dressed.

[0057] The user height estimation system 1 according to this first embodiment of the invention comprises, as illustrated in [Fig. 1]: - seat 10 with backrest, - the first pressure sensor 21 arranged in the backrest 11 at a first height relative to the seat 12, the first height being adapted so that the first pressure sensor 11 is subjected to the pressure of the user's back only when the latter is taller than a first predefined height, the first pressure sensor 11 being able to provide a first pressure value corresponding to the forces exerted by the pressure of the user's back on the first pressure sensor 11, - a second pressure sensor 22 arranged in the backrest 11 at a second height relative to the seat 12, the second height being lower than the first height, in such a way that the second sensor is subjected to the pressure of the user's back when the latter is shorter than the first height, the second pressure sensor 22 being capable of providing a second pressure value corresponding to the forces exerted by the user's back pressing on the second pressure sensor 22, - a third pressure sensor 23 arranged in the backrest 11 at a third height relative to the seat 12, the third height being distinct from the first and second heights and being adapted so that the third pressure sensor 23 is subjected to the pressure of the user's back, the third pressure sensor 23 being capable of providing a third pressure value corresponding to the forces exerted by the pressure of the user's back on the third pressure sensor 23, - a fourth, a fifth and a sixth pressure sensor 31, 32, 33 arranged in the seat 12, the fourth, fifth and sixth pressure sensors 31, 32, 33 being capable of providing respectively a fourth, a fifth and a sixth pressure value corresponding to the forces exerted by the user's buttocks on respectively the fourth, fifth and sixth pressure sensors 31, 32, 33,- an imaging system 50 arranged such that at least an upper part of the backrest 11, intended to receive the head or a shoulder of the user, is within the field of vision of the imaging system 50, the imaging system 50 being adapted to capture at least a first image of the user seated in the seat, , - a processing unit 40 configured to determine the estimated value of the user's height based on the first, second and third pressure values ​​and an image analysis performed from at least one first image and to determine an estimated value of the user's weight based on the fourth, fifth and sixth pressure values.

[0058] The first, second, and third pressure sensors 21, 22, 23, as well as the fourth, fifth, and sixth pressure sensors 31, 32, 33, can be pressure sensors of any type, such as, for example, piezoelectric or capacitive pressure sensors, and are capable of providing a pressure value corresponding to the forces applied to them. The first, second, and third pressure sensors 21, 22, 23 are preferably arranged between the upholstery and the padding of the backrest 11 so that the upholstery can transmit the forces from the user's back. According to one embodiment, at least one of the first, second, and third pressure sensors 21, 22, 23 can be at least partially housed within the padding of the backrest 11.

[0059] Estimating the size estimation value

[0060] In order to provide a good estimate of the user's size, the positioning of the first, second, and third pressure sensors 21, 22, 23 in the backrest 11 can be optimized. An example of optimized positioning of the first, second, and third pressure sensors is illustrated in Figures 1 and 2.

[0061] More specifically, [Fig.2] shows such a positioning of the first, second and third pressure sensors 21, 22, 23 vis-à-vis the file this in correspondence to a recording of the average pressure distribution applied to the file recorded by the inventors for 50 people whose height is between 1.55 m and 2 m. the average pressure distribution is thus represented in grey scale, the light parts corresponding to a maximum pressure the black parts corresponding to an absence of pressure applied by the user.

[0062] In this example of optimized positioning, the first pressure sensor 21 can be arranged to correspond to an average support point of a shoulder, here the left shoulder, of users whose height falls within a first range of heights greater than or equal to the first height. Thus, for example, the inventors selected a first height range from 1.80 m to 2 m. Of course, this first range is only an example, and other height ranges are perfectly conceivable; the inventors could thus have, for example, selected a height range from 1.75 m to 1.90 m, or even from 1.78 m to 1.95 m. Therefore, the first pressure sensor 21 can be positioned at a first height between 50 and 54 cm from the seat, or even between 51 and 53 cm, this first height preferably being approximately 52 cm.

[0063] It should be noted that such an average support point of a shoulder can be determined from recordings of the pressure distribution applied to the backrest for different users / persons, such as those recorded by the inventors for 50 people whose height ranges from 1.55 m to 2 m. Indeed, from such recordings, it is easy to determine for each of these people a pressure peak associated with one of their shoulders and the positioning of said peak. From these different positions, by selecting only the people corresponding to a given criterion, such as a height range, it is easy to calculate an average positioning of the pressure peak associated with said shoulder for said people corresponding to said criterion. According to another possibility, it is also possible to average the recordings, as shown in [Fig.2] and to identify the pressure peak associated with one of the shoulders of said persons in said averaged recording.

[0064] With such a positioning of the first pressure sensor 21, the inventors measured, during the recording of the average pressure distribution applied to the backrest for 50 people, a first pressure value corresponding to the forces exerted by the support of the user's back on the first sensor which varies between 0 g.cm2 (i.e. that the person is smaller than the first size), and 50 g.cm2.

[0065] The second pressure sensor 22 can be arranged to correspond to a mean support point of a shoulder, here the right shoulder, of users whose height falls within a second size range, the sizes of which are at least partly smaller than the sizes of the first size range and preferably smaller than sizes from the first size range. Thus, for example, the inventors selected a second size range from 1.70 m to 1.80 m, which is much smaller than those in the first size range selected. Of course, other size ranges are perfectly conceivable; the inventors could have selected a size range from 1.60 m to 1.75 m, or even 1.55 m to 1.70 m. Therefore, the second pressure sensor 22 can be positioned at a second height between 41 and 45 cm from the seat, or even between 42 and 44 cm, this second height preferably being approximately 43 cm.

[0066] With such a positioning of the second pressure sensor 22, the inventors measured, during the recording of the average pressure distribution applied to the backrest for 50 people, a first pressure value corresponding to the forces exerted by the support of the user's back on the first sensor which varies between 0 g.cm2 (i.e. that the person has a height less than the lowest value in the range), and 23 g.cm2.

[0067] According to this optimization example, preferably, when the positioning of the first and second pressure sensors 21, 22 correspond to a support point of a shoulder, the first pressure sensor 21 is then associated with one of the right shoulder and the left shoulder, the second sensor being then associated with the other of the right shoulder and the left shoulder.

[0068] The third pressure sensor 23 can be arranged above the average support point of an iliac crest (here the right one) of the users so that the third pressure sensor 23 is subjected to the pressure of the user's back when the user is of average height, i.e., a height within an average range, for example, between 1.60 m and 1.75 m. Of course, if in the present example the positioning of the pressure sensor 23 is located on a right portion of the backrest 11, it can also be located on a left portion, or even a central portion, of the backrest 11.

[0069] With such a positioning of the third pressure sensor 23, the inventors measured, during the recording of the average pressure distribution applied to the backrest for 50 people, a first pressure value corresponding to the forces exerted by the support of the user's back on the first sensor which varies between 0 g.cm2 (i.e. that the size of said person is outside the average range indicated above) and 24 g.cm2.

[0070] With such an arrangement of the first, second and third pressure sensors 21, 22, 23, pressure values ​​are provided that are representative of the forces exerted by the user's back on the backrest at several locations on the latter, including a location corresponding to relatively tall users, the location of the first pressure sensor 21, and a location corresponding to users of a certain height average, the location of the second pressure sensor 22, and a location corresponding to all users, the location of the third pressure sensor 23.

[0071] The imaging system 50 comprises at least one camera whose field of view includes the backrest 11, and therefore the user when the latter is seated in the seat 10, and which preferentially faces the seat 10 (and thus the user). Thus, for example, in an application in which the estimation system 1 is fitted to a motor vehicle and integrated into the driver's seat, said camera may be installed near the vehicle's rearview mirror. Alternatively, in a stationary installation for which the seat 10 is an office chair, the camera may be a camera fitted to a computer monitor in the office, such as a webcam integrated into said monitor, or a camera integrated into office furniture, such as a lamp.The imaging system 40 and / or the processing unit 40 is adapted to determine, from the first image provided by at least one camera, the height of at least one reference point of the user, such as the nose, eyes, mouth... It should be noted that, preferably, the camera and the imaging system can also be adapted to determine information on a distance between the at least one camera and the user's reference point(s).

[0072] The processing unit is configured to provide an estimated user height based on the first, second, and third pressure values ​​and the analysis of the first image. Such an estimated user height can be the user's height itself, another value related to the user's height, such as, for example, the height of the user's head or shoulder relative to the seat, or a state value representative of the estimated height.Such a representative state value could be, for example, a state value that takes a true value when it is estimated that the user's height is greater than or equal to a threshold size, such as the first size, and a false value otherwise; or a state value that takes a true value when it is estimated that the user's height is within a predefined range of sizes, and a false value otherwise. Based on this, the processing unit can determine several state values ​​corresponding to different thresholds and / or ranges.

[0073] To do this, the processing unit 40 can be configured to use a first relationship determined by calibration between the first, second and third pressure values ​​provided by the first, second and third pressure sensors 21, 22, 23 and a size value of the user installed in the seat, this value being able to be corrected from a size value estimated on the basis of the analysis of the first image.

[0074] Thus, such a relationship can, for example, take the form of the following equation:

[0075] [Math.l] the estimated — a ^'sensor1 4- h X Feapteiir 2 4" ( X Fcaptgur 1 4" 5^

[0076] With Testimated the estimated value of the user's size, Fsensor1, Fsensor2, Fsensor3, the pressure values ​​obtained for the first, second and third pressure sensors 21, 22, 23, here averaged forces calculated from the measurements obtained with said pressure sensors 21, 22, 23, a, b, c the multiplicative coefficients associated respectively with the first, second and third pressure sensors 21, 22, 23 and g 1 a correction coefficient.

[0077] It should be noted that such a first relationship, as described below in relation to [Fig. 4], can be obtained, for example, by simple linear regression or other statistical analysis methods on the calibration data. Of course, other learning methods can be implemented to determine such a relationship, such as deep learning methods based on the use of neural networks. Such methods make it possible to determine more complex relationships than the linear equation indicated above, allowing for a more precise estimation from the first, second, and third pressure values.

[0078] Thus, on the basis of calibration and in application of this latter possibility, the processing unit can also determine the user's size estimation value on the basis of prior learning, for example based on neural networks, based on pressure values ​​and image analysis data obtained during calibration carried out from a panel of representative users.

[0079] Such calibration, as implemented by the inventors within the framework of the invention, may consist of having a panel of users representative of the expected users of the seat sit down and recording, for each of these representative users, the pressure values ​​provided by the various pressure sensors 21, 22, 23 and the imagery provided by the imaging system 50 in association with the height of said representative user. From these pressure values, the images, and the height of said users, a calibration database is then obtained which can be used to determine the first relationship used by the processing unit 40.

[0080] Estimating the user's weight estimate value

[0081] In the same way as for the first, second, and third pressure sensors 21, 22, 23, and in order to provide a good estimation of the user's weight, the positioning of the fourth, fifth, and sixth pressure sensors 31, 32, 43 in the seat 11 can be optimized. An example of optimized positioning of the fourth, fifth, and third pressure sensors 31, 32, 33 is thus illustrated in Figures 1 and 3.

[0082] More specifically, [Fig. 3] illustrates such a positioning of the fourth, fifth, and sixth pressure sensors 31, 33, 33 with respect to the seat, corresponding to a recording of the average pressure distribution applied to the seat recorded by the inventors for 50 people weighing between 45 kg and 115 kg. The average pressure distribution is thus shown on a gray scale, with light areas corresponding to maximum pressure and black areas corresponding to no pressure applied by the user.

[0083] According to this example of optimized positioning, the fourth pressure sensor 31 can be arranged in the seat 12 to correspond to a maximum average pressure applied by one of the user's buttocks, here the left buttock, a few centimeters from the user towards the backrest 11 and outwards from the seat (here towards the left side). As shown in [Fig. 3], the inventors have determined that the maximum average pressure applied by the user's buttocks is located approximately 14 cm in front of the rear of the seat, and approximately 6 cm on each side of the seat's central axis. It should be noted that by a few centimeters of a maximum average pressure, we mean that the fourth pressure sensor 32 is arranged at a distance of between 1 and 10 cm, or even between 2 and 6 cm from said maximum pressure, the offset according to each of the said external directions and towards the backrest being between 1 and 10 cm, or even between 2 and 6 cm.

[0084] Similarly, the fifth pressure sensor 32 can also be arranged in the seat 12, corresponding to a maximum average pressure applied by one of the buttocks, here the right buttock, of the users, a few centimeters from this pressure in a direction opposite to the backrest 11 and outwards from the seat (here towards the right side). It should be noted that by a few centimeters from a maximum average pressure, we mean that the fifth pressure sensor 32 is arranged at a distance of between 2 and 15 cm, or even between 4 and 10 nm, from said maximum pressure, the offset in each of the said directions, outwards and towards the backrest, being between 1 and 10 cm, or even between 2 and 6 cm.

[0085] Naturally, as with the first and second pressure sensors 21, 22, the fourth and fifth pressure sensors 31, 32 are preferably arranged to correspond to a maximum average pressure, one on the right buttock and the other on the left buttock of the users. It is nevertheless perfectly conceivable that the fourth and fifth pressure sensors 31, 32 could be arranged to correspond with the same maximum pressure towards the outside of the seat 12, the fourth pressure sensor 31 being further offset towards the backrest, and the fifth pressure sensor 32 being further offset in the opposite direction.

[0086] According to this same example of optimized positioning, the sixth pressure sensor 33 can be arranged in the seat 12 in a median position of the seat at the front of the fifth pressure sensor 32. Such a position corresponds to an intermediate position between the average position of the pressure exerted by the user's thighs near the users' crotch.

[0087] The processing unit is configured to provide an estimated user weight based on the fourth, fifth, and sixth pressure values. This estimated user weight can be the user's own estimated weight, another value related to the user's weight, such as a weight corresponding to a part of the user's body, such as the upper body, or a representative state value of the estimated weight. For example, a representative state value can be true when the user's weight is estimated to be greater than or equal to a threshold weight, and false otherwise; or a state value that is true when the user's weight is estimated to be within a predefined weight range, and false otherwise.Based on this, the processing unit may be able to determine several state values ​​corresponding to different thresholds and / or ranges.

[0088] To achieve this, the processing unit 40 can be configured to use a second relationship determined by calibration between the fourth, fifth, and sixth pressure values ​​provided by the fourth, fifth, and sixth pressure sensors 31, 32, 23 and a weight value of the user installed in the seat. The type of statistical analysis / learning that can be implemented for determining the estimated value of the user's height can also be used for determining the estimated value of the user's weight.

[0089] It should be noted that, according to one possibility of the invention, when determining the second relationship, this relationship can also take into account at least one of the first, second, and third pressure values ​​in addition to the fourth, fifth, and sixth pressure values. Said at least one value can, for example, be the third pressure value, which, according to this present embodiment, represents the forces applied by the user's back on the third pressure sensor 23, since the arrangement of the latter ensures that force is applied regardless of the user's size.

[0090] Thus, the second relation can, for example, take the form of the following equation:

[0091] [Math.2] fEstimated = d X Fgapteur 4 "be * ^sensor 5 + f ^sensor 6 "b 5 2

[0092] With Pestilenced the estimated value of the user's weight, Fsensor4, Fsensor5, Fsensor6 the pressure values ​​obtained for the fourth, fifth and sixth sensors of pressure 31, 32, 33, here averaged forces calculated from the measurements obtained with said pressure sensors 21, 32, 23, d, e, f multiplicative coefficients associated respectively with the fourth, fifth and sixth pressure sensors 31, 32, 33 and g2 a correction coefficient.

[0093] Of course, according to a possibility similar to that described in the context of estimating the user's size, if such a second relationship can be obtained for example by simple linear regression or other method of statistical analysis of calibration data, other learning methods can be implemented to determine this second relationship, so as to provide a more complex second relationship allowing a more precise weight estimation.

[0094] Similarly, during the calibration step specified in the user height estimation, the pressure values ​​of the fourth, fifth, and sixth pressure sensors 31, 32, 33 can also be recorded, in association with the weight of the users in the representative user panel of users expected for the seat and to be recorded. From these pressure values ​​and the weight of said users, the calibration database can be used to determine the second relationship used by the processing unit 40.

[0095] The processing unit and processes associated with the estimation system

[0096] The processing unit 40 can be provided either in the form of one or more dedicated processing circuits, integrated or not into the seat 10, or as a sub-circuit and / or subprograms of a vehicle's on-board computer or of the control electronics of a work environment. The dedicated processing circuit(s) or sub-circuit / subprogram(s) are adapted to retrieve the pressure values ​​provided by the various pressure sensors 21, 22, 23, 31, 32, 33, and to provide the estimated height and weight values ​​of the seat 10 user.This information can be provided to electronic control systems for safety features of the vehicle, such as the vehicle's airbag electronics, as well as to ergonomic features of the vehicle, such as the steering wheel adjustment system and the mirror height and orientation adjustment system, or even to ergonomic features of an office, such as a seat height and suspension adjustment system.

[0097] The user height estimation system 1 according to this first embodiment can be manufactured using a manufacturing process comprising the following steps: - supply of seat 10, seat 10 integrating in its backrest 11 the first, second and third pressure sensors 21, 22, 23, and in the seat 12 the fourth, fifth and sixth pressure sensors 31, 32, 33, - provision of the imaging system 50 and its arrangement in such a way that at least an upper part of the backrest 11, intended to receive the user's head or shoulder, is within the field of vision of the imaging system 50, - provision of the processing unit 40 with a configuration adapted to determine an estimate of the user's height based on the first, second and third pressure values ​​provided by the first, second and third pressure sensors 21, 22, 23 and the analysis of the first image provided by the imaging system 50, and to determine an estimate of the user's weight based on the fourth, fifth and sixth pressure values ​​provided by the fourth, fifth and sixth pressure sensors 31, 32, 33.

[0098] The step of supplying the processing unit 40 may include the following sub-steps: - first calibration of seat 10 in order to determine a first relationship between the first, second and third pressure values ​​provided by the first, second and third pressure sensors 21, 22, 23 and an estimated value of the user's size, - second calibration of seat 10 in order to determine a second relationship between the fourth, fifth and sixth pressure values ​​provided by the fourth, fifth and sixth pressure sensors 31, 32, 33 and an estimated value of the user's weight, - configuration of the processing unit so that it implements the first relationship determined during the first calibration substep to determine the estimated value of the user's height based on the first, second and third pressure values ​​and takes into account an image analysis carried out from at least one first image provided by the imaging system, and so that it implements the second relationship determined during the second calibration substep to determine the estimated value of the user's weight based on the fourth, fifth and sixth pressure values.

[0099] It will be noted that according to a usual implementation of the invention, the first and second calibrations can be simultaneous, the pressure values ​​of the first, second, third, fourth, fifth and sixth pressure sensors 21, 22, 23, 31, 32, 33 being recorded for each user in a single step, so as to limit the time required to carry out these calibrations.

[0100] Once manufactured, such an estimation system 1 can allow an estimation of the size of a user from an estimation process comprising the following steps: - measurement of a first, second and third pressure value corresponding to the forces applied by the user's back on the first, second and third pressure sensors 21, 22, 23, - capture of a first image from the imaging system 50 and analysis of the first image, - determination of the user's size from the first, second and third pressure values ​​and the analysis of the first image.

[0101] The estimation system according to this first embodiment is also adapted to implement a method for estimating a user weight value comprising the following steps: - measurement of a fourth, fifth and sixth pressure value corresponding to the forces applied by the user's buttocks on the fourth, fifth and sixth pressure sensors 31, 32, 33, - optional measurement of at least one pressure value from a first, second and third pressure value corresponding to the forces applied by the user's back on the first, second and third pressure sensors 21, 22, 23, - determination of the user's weight from the fourth, fifth and sixth pressure values ​​and possibly at least one value from the first, second and third pressure values.

[0102] It should be noted that, for estimating the user's height and weight, the pressure measurements are preferably averaged over a period of between 1 and 30 seconds, or even between 10 and 20 seconds, in order to limit any potential user movement during pressure measurements by the pressure sensors 21, 22, 23, 31, 32, 33. Of course, these duration values ​​are given only as examples and must be adapted to the use of the invention. Thus, in certain specific applications of the invention, particularly the adaptation over time of the ergonomics of the space and the seat for a predefined user, the pressure measurements may be averaged over longer periods, such as between 30 seconds and 1 hour. Example of an implementation of the invention

[0103] In order to illustrate the principle of the invention, the inventors have implemented an example of an embodiment of the invention with regard to estimating the size of the user in a configuration according to this first embodiment and determined a relationship to allow an estimation of an estimate value of the size of the user for this example embodiment.

[0104] According to this embodiment, a first, second, and third pressure sensor 21, 22, 23 were arranged in the housing 11 in accordance with the optimized arrangement described in this first embodiment. The first, second, and third pressure sensors 21, 22, 23 have a measuring surface of 2.5 cm by 3.8 cm. From the measurements of the first, second, and third sensors of pressure 21, 22, 23, it is possible to determine a force in kilograms applied by the user's back on said pressure sensors by multiplying the measured pressure by the measurement surface of pressure sensor 21, 22, 23.

[0105] In such a configuration, the inventors were able to determine the following values ​​for equation Math 1: a = 23.2 cm.kg⁻¹, b = 61.9 cm.kg⁻¹, c = 38.1 cm.kg⁻¹, and gl = 165.2 cm. Thus, according to this embodiment, equation Math 1 for an estimated value of the user's height in centimeters becomes:

[0106] [Math.3] ^estimated = 23.2 X j + 61.9 X Fsensor g + 38.1 X ^sensor 1 + 165.2

[0107] Based on these coefficients, the inventors obtained a root mean square error, more commonly known by its English name Root Mean Square Error, between the user's height and the estimated value of the user's height of 5.7 cm and a Pearson correlation between the user's height and the estimated value of the user's height of 0.80.

[0108] It should be noted that while in this first embodiment the estimation system 1 is capable of estimating both an estimated value for the user's height and an estimated value for the user's weight, these two estimates are independent of each other. Thus, it is perfectly conceivable, without departing from the scope of the invention, that the estimation system 1 could be adapted to estimate only the estimated value for the user's height without estimating the user's weight. According to this possibility, the estimation system 1 does not include the fourth, fifth, and sixth pressure sensors 31, 32, 33.

[0109] Variant not included in the scope of the invention

[0110] Similarly, alternatively and according to a possibility not included in According to the invention, the estimation system 1 can be a user weight estimation system. According to this possibility not included in the invention, the estimation system does not include an imaging system and may, in the case where none of the first, second and third pressure values ​​are used for determining the user weight estimation value, not include first, second and third pressure sensors 21, 22, 23.

[0111] It should also be noted that, since these estimates of the user's height and weight are independent of each other, the teachings of this document, with regard to measuring the weight estimate value, while applicable within the scope of the invention, can also be applied independently of the invention. Thus, the teachings of the third embodiment, as specified therein, can be applied independently of the user's height estimate and therefore independently of the scope of the invention.

[0112] Similarly, in the context of such a variant not included in the scope of the invention, it is possible to obtain an estimated value of the user's weight based solely on the fourth and fifth pressure sensors 31, 32 with the arrangement described in the first embodiment above. The use of the sixth pressure sensor 33 according to the arrangement described in the first embodiment allows for a more precise weight estimation compared to a configuration with two pressure sensors.

[0113] Thus, such a variant not included in the scope of the invention allows the estimation of the user's weight with a reduced number of pressure sensors, prior art systems generally being based on a large number of pressure sensors arranged in a matrix. Second embodiment

[0114] Of course, the seat 10 according to this first embodiment corresponds to an advantageous configuration of the invention in which the seat 10 is equipped with three pressure sensors 21, 22, 23 for estimating the user's height, in combination with the imaging system, and three pressure sensors 31, 32, 33 for estimating the user's weight. Thus, it is perfectly feasible to estimate the user's height with a number of pressure sensors 21, 22, 23 arranged in the backrest 11 other than three and / or without implementing an imaging system.

[0115] Thus, in accordance with this possibility, in a second embodiment of the invention and in accordance with [Fig.4], the size estimation system 1 may further comprise a seventh and an eighth pressure sensor 24, 25 arranged in the backrest 11 so that the seventh and eighth pressure sensor 24, 25 are subjected to the forces transmitted by the user's back and the processing unit 40 may further implement the first relationship between the first, second, third, seventh and eighth pressure values ​​and the user's size estimation value to determine said value.

[0116] An estimation system 1 according to this second embodiment differs from an estimation system according to the first embodiment in that it further provides such a seventh and eighth pressure sensor 24, 25 and in that the processing unit 40 is configured to determine the estimation value of the user's size on the basis of further the seventh and eighth pressure values.

[0117] Fig. 4 thus shows an example of positioning of these seventh and eighth pressure sensors 24, 25 vis-à-vis the backrest 11, corresponding to the recording of the average pressure distribution applied by the user's back on the backrest recorded by the inventors for 50 people whose height is between 1.55 m and 2 m.

[0118] The seventh pressure sensor 24 can thus be positioned above the point The average support point is positioned on the user's iliac crest (here, the left), at a height relative to the seat greater than that of the third pressure sensor, so that the seventh pressure sensor 24 is supported by the user's back, regardless of their height. It should be noted that, preferably, the third and seventh pressure sensors 24 and 25 are associated, respectively, with the right iliac crest and the left iliac crest. The eighth pressure sensor 25 can be positioned at a support point on the lower back of the user.

[0119] According to this second embodiment, the processing unit 40 can be configured to use a first relationship determined by calibration between the first, second, third, seventh and eighth pressure values ​​provided by the first, second, third, seventh and eighth pressure sensors 21, 22, 23, 24, 25 and a size value of the user installed in the seat, this value can then possibly be corrected from a size value estimated on the basis of the analysis of a first image provided by an optional imaging system 50.

[0120] A method for manufacturing an estimation system according to this second embodiment differs from a method for manufacturing according to the first embodiment in that, during the seat supply step, the seat further integrates the seventh and eighth pressure sensors 24, 25 into its backrest, and in that, during the supply of the processing unit 40, the processing unit is configured to determine the size estimation value based on the first, second, third, seventh, and eighth pressure values ​​provided by the first, second, third, seventh, and eighth pressure sensors 21, 22, 23, 24, 25. Third embodiment

[0121] In the same way as in the second embodiment where it is possible to use more than three pressure sensors 21, 22, 23, to determine an estimate value of the user's size, it is also possible to use a number of pressure sensors 31, 32, 33 arranged in the seat 12 other than three.

[0122] Thus, in accordance with this possibility, in a third embodiment of the invention and in accordance with [Fig.5], the size estimation system 1 may further comprise a ninth and tenth pressure sensors 34, 35 arranged in the seat 13 so that the ninth and tenth pressure sensors 34, 25 are subjected to the pressure of the user's buttocks and the processing unit 40 may further implement the second relationship between the fourth, fifth, sixth, ninth and tenth pressure values ​​and the estimated value of the user's weight to determine said value.

[0123] An estimation system 1 according to this third embodiment differs from an estimation system according to the first embodiment in that it further provides for such ninth and tenth pressure sensors 34, 35 and in that the unit of Processing 40 is configured to determine the estimated value of the user's weight based on, in addition, the ninth and tenth pressure values.

[0124] Fig. 5 thus shows an example of positioning of these ninth and tenth pressure sensors 34, 35 opposite the seat 12, corresponding to the average pressure distribution applied to the seat 12 by the user's buttocks recorded by the inventors for 50 people whose weight is between 45 kg and 115 kg.

[0125] The ninth and tenth pressure sensors 34, 35 can thus be arranged symmetrically, with respect to the plane of symmetry of the seat 10, respectively to the fourth and fifth pressure sensors 31, 32.

[0126] According to this third embodiment, the processing unit 40 can be configured to use a second relationship determined by calibration between the fourth, fifth, sixth, ninth and tenth pressure values ​​provided by the fourth, fifth, sixth, ninth and tenth pressure sensors 31, 32, 33, 34, 35 and a weight value of the user installed in the seat.

[0127] A manufacturing method for an estimation system according to this third embodiment differs from a manufacturing method according to the first embodiment in that, during the seat supply step 10, the seat further integrates the ninth and tenth pressure sensors 34, 35 into its seat 12, and in that, during the supply of the processing unit 40, the processing unit is configured to determine the weight estimation value on the basis of the fourth, fifth, sixth, ninth and tenth pressure values ​​provided by the fourth, fifth, sixth, ninth and tenth pressure sensors 31, 32, 33, 34, 35.

[0128] In contrast to these second and third embodiments, a number of pressure sensors less than three may also be provided, in particular for determining the estimated value of the user's size. First variant of the invention

[0129] Thus, according to a first variant not illustrated, it is perfectly conceivable that the estimation system 1 includes only two pressure sensors for determining the estimation value of the user's size, the processing unit being configured to determine an estimation value of the user's size on the basis of the first and second pressure values ​​and, possibly, an image analysis carried out from at least one first image provided by the imaging system.

[0130] It should be noted that, according to this first variant, the positions of the first and second sensors are adapted so that the first and second pressure sensors 21, 22 exhibit significantly different responses to the forces exerted by the user's back support, depending on their size. Thus, for example, in accordance with the teaching of the positioning of the first and second pressure sensors 21, 22 described in the first embodiment, the first and second sensors 21, 22 can be matched to an average support point, for example that of the user's shoulders, associated with two distinct size ranges.

[0131] In this way, within the framework of the present first variant of the invention, the processing unit makes it possible to estimate the size of the user on the basis of pressure obtained at two different heights with in particular a good distinction between the size ranges corresponding to the first and second pressure sensors 21, 22 when the latter are associated with such ranges.

[0132] A manufacturing method for an estimation system 1 according to this first variant of the invention differs from a manufacturing method according to the first embodiment in that, when supplying the seat, only the first and second pressure sensors 21, 22 are arranged in the backrest 11 and in that the processing unit 40 is adapted to determine the estimated value of the user's size from the pressure values ​​provided by the first and second pressure sensors 21, 22 and a possible analysis of a first image provided by an optional imaging system 50. Second variant of the invention

[0133] According to a second, unillustrated embodiment, the estimation system 1 may comprise only a single pressure sensor to determine the estimated value of the user's height. According to this second embodiment of the invention, the estimated value of the user's height is a state value that takes the true value when it is estimated that the user has a height greater than or equal to a first size, and a false value otherwise.

[0134] Thus, according to this second variant, the first pressure sensor 21 is arranged in the backrest 11 at a first height relative to the seat 12, the first height being adapted so that the first pressure sensor 11 is subjected to the pressure of the user's back only when the latter is taller than the first predefined height. Such an arrangement of the first sensor can therefore correspond to that of the first sensor 21 as described in the first embodiment.

[0135] In this way, the processing unit can be able to determine that the user has a size greater than the first size when a pressure greater than the first sensor 21 is measured at a threshold corresponding to a back support of the user having a size greater than the first size.

[0136] A manufacturing method for an estimation system 1 according to this second variant differs from a manufacturing method according to the first embodiment in that, when the seat is supplied, only the first pressure sensor 21 is arranged in the backrest 11 and in that the processing unit 40 is adapted to determine a state value as an estimation value of the user's size from the only pressure value provided by the first pressure sensor.

Claims

Demands

1. A system (1) for estimating the height of a user of a seat (10), the estimation system (1) comprising: - the seat (10) comprising a seat (12) and a backrest (11) to accommodate the buttocks and back of the user respectively, - at least one first pressure sensor (21) arranged in the backrest (11) at a first height relative to the seat (12), the first height being adapted so that the first pressure sensor (11) is subjected to the pressure of the user's back only when the latter is taller than a first predefined height, the first pressure sensor (11) being capable of providing a first pressure value corresponding to the forces exerted by the pressure of the user's back on the first pressure sensor (11), - a processing unit (40) configured to determine an estimate value of the user's height on the basis of at most five pressure values ​​including said first pressure value.

2. Estimation system (1) according to claim 1 further comprising a second pressure sensor (22) arranged in the backrest (11) at a second height relative to the seat (12), the second height being lower than the first height in such a way that the second sensor is subjected to the pressure of the user's back when the latter is shorter than the first height, the second pressure sensor (22) being capable of providing a second pressure value corresponding to the forces exerted by the pressure of the user's back on the second pressure sensor (22), wherein the second pressure value is included in the at most five pressure values ​​on the basis of which the processing unit determines the estimation value of the user's height.

3. Estimation system (1) according to claim 2 further comprising a third pressure sensor (23) arranged in the backrest (11) at a third height relative to the seat (12), the third height being distinct from the first and second heights and being adapted so that the third pressure sensor (23) is subjected to the pressure of the user's back, the third pressure sensor (23) being capable of providing a third pressure value corresponding to the forces exerted by the pressure of the user's back on the third pressure sensor (23), wherein the third pressure value is included in the at most five pressure values ​​on the basis of which the processing unit determines the estimated value of the user's size.

4. Estimation system (1) according to claim 2 or 3, wherein the first pressure sensor (21) is arranged in the backrest (11) corresponding to a mean support point of a user's shoulder having a size within a first size range whose sizes are greater than or equal to the first size, the second pressure sensor (22) being arranged in the backrest (11) corresponding to a mean support point of a user's shoulder having a size within a second size range smaller than at least some, or even all, of the sizes in the first size range.

5. Estimation system (1) according to any one of claims 1 to 4 further comprising an imaging system (50) arranged such that at least an upper part of the backrest (11), intended to receive the head or a shoulder of the user, is in the field of vision of the imaging system (50), the imaging system (50) being adapted to capture at least one first image of the user installed in the seat (10), the processing unit (40) being configured to determine the estimated value of the user's height on the basis of further image analysis carried out from at least one first image.

6. Estimation system (1) according to any one of claims 1 to 5 further comprising a fourth pressure sensor (31) arranged in the seat, the fourth sensor (31) being capable of providing a fourth pressure value corresponding to the forces exerted by the user's buttocks on the fourth pressure sensor (31), wherein the processing unit (40) is further configured to determine an estimate value of the user's weight on the basis of the fourth pressure value.

7. Estimation system (1) according to claim 6, wherein the processing unit (40) is further configured to determine the estimated value of the user's weight on the basis of further a pressure value measured at the backrest, such as the first pressure value.

8. Estimation system (1) according to any one of claims 1 to 7, wherein the seat is fitted to a vehicle.

9. A method for manufacturing a system (1) for estimating the size of a seat user (10), the method comprising the following steps: - supply of the seat (10) comprising a seat (12) and a backrest (11) to accommodate the buttocks and back of the user respectively, said seat (10) having a first pressure sensor (21) arranged in the backrest (11) at a first height relative to the seat (12), the first height being adapted so that the first pressure sensor (11) is subjected to the pressure of the user's back only when the latter is taller than a first predefined height, the first pressure sensor (21) being able to provide a first pressure value corresponding to the forces exerted by the pressure of the user's back on the first pressure sensor (21), - supply of a processing unit (40) configured to determine an estimate of the user's height based on a maximum of five pressure values ​​including said first pressure value.

10. A method for manufacturing an estimation system (1) according to claim 9, wherein, upon delivery of the seat (10), the seat has a second pressure sensor (22) arranged in the backrest (11) at a second height relative to the seat (12), the second height being lower than the first height, such that the second sensor is subjected to the pressure of the user's back when the latter is shorter than the first height, the second pressure sensor (22) being capable of providing a second pressure value corresponding to the forces exerted by the pressure of the user's back on the second pressure sensor (22), and wherein, during the delivery step of the processing unit (40), a calibration substep is provided to determine a relationship between at most five pressure values ​​including the first and second pressure values ​​provided by the first and second pressure sensors (21,22) and a user size value installed in the seat, and a processing unit configuration substep so that it implements the relationship determined during the calibration substep to determine the user size estimate value based on at most five pressure values ​​including the first and second pressure values.

11. A method for manufacturing an estimation system according to claim 9 or 10, wherein, upon delivery of the seat (10), the seat further comprises a fourth pressure sensor (31) arranged in the seat (12), the fourth sensor (31) being capable of providing a fourth pressure value corresponding to the forces exerted by the user's buttocks on the fourth pressure sensor (31), and in which, when supplying a processing unit (40), the processing unit (40) is further configured to determine an estimate of the user's weight based on the fourth pressure value.

12. Method for estimating the height of a seat user, the seat (10) comprising a seat (12) and a backrest (11) to accommodate the buttocks and back of the user respectively, the method comprising the following steps: - measuring at least a first pressure value corresponding to the forces exerted by the support of the user's back on the backrest (11), this at a first height of the backrest (11), the first height being chosen in such a way that the user's back applies support at said first height only when the user is taller than a first predefined height, - determining an estimate value of the user's height on the basis of at most five pressure values ​​including said first pressure value.

13. A method for estimating the height of a seat user (10) according to claim 12 further comprising a step of measuring at least a second pressure value corresponding to the forces exerted by the support of the user's back on the backrest (11), this at a second height of the backrest (11), the second height being chosen lower than the first such that the user's back applies support at said second height when the user is shorter than the first height, and wherein, during the step of determining the estimated value of the user's height, said second pressure value is included in the at most five pressure values ​​on the basis of which the estimated value of the user's height is determined.

14. A method for estimating the size of a seat user (10) according to claim 11 or 12 further comprising the following steps of: - measuring at least a fourth pressure value corresponding to the forces exerted by the user's buttocks at a location on the seat, - determination of an estimated value for the user's weight based on the fourth pressure value.

15. Method for estimating the size of a seat user (10) according to any one of claims 11 to 14, wherein a step of adjusting the seat from the determined weight estimate value is further provided.

Images