Occupant protection device and seat belt unit for motor vehicle

Abstract

The invention relates to an occupant protection device (1) for a motor vehicle (10), comprising an adaptive restraint system (2) having a restraint device (12) and a sensor device (3) for detecting an occupant-specific parameter and a control device (4), the control device is adapted and configured to control the restraint device (12) in the event of an accident according to the occupant-specific parameter. The sensor device (3) comprises a fabric pressure sensor (13) which is integrated into a belt webbing (15) of the seat belt (5) and provides a large number of spatially distributed pressure signals. The evaluation unit (23) is adapted and configured to record the pressure signals in a spatially resolved manner and to determine a pressure profile describing a spatial profile of forces exerted on the seat belt (5) by a person (20) wearing the seat belt.

Description

Technical Field

[0001] The invention relates to an occupant protection device for a motor vehicle having at least one adaptive restraint system. The restraint system comprises at least one restraint device and at least one sensor device for detecting at least one occupant-specific parameter and at least one control device. The control device is adapted and configured to control the at least one restraint device as a function of the occupant-specific parameter at least in the event of an accident. Background Art

[0002] Such occupant protection devices are intended to minimize or, ideally, completely prevent injuries to the occupants in the event of an accident. However, in the event of an accident, the restrained person is at risk of injury; for example because the airbag or seat belt is not adapted to the seat position or other specific characteristics of the occupant to be restrained. For this reason, so-called adaptive restraint systems are used in modern vehicles, in which the restraint device can be adjusted to the specific characteristics of the occupant to be restrained.

[0003] DE 103 45 726 B4 describes an adaptive restraint system in which the weight of the occupant is measured by means of a pressure-sensitive membrane in the seat cushion or via a weight sensor in the seat. The size and position of the occupant can be determined by a camera via image processing. This data is used to adjust the force of the belt tensioner.

[0004] From DE 10 2020 214 871 A1, an occupant protection device is known, which comprises an observation device with a camera for detecting markings on a seat belt. The markings are used to calculate measurement values, based on which occupant-specific characteristics and, for example, posture, viewing direction or head position are determined. This makes it possible to set safety functions or comfort functions in the vehicle (for example, vehicle seats or steering wheels) according to occupant-specific characteristics in the event of an accident. Summary of the invention

[0005] With this in mind, the object of the present invention is to provide an improved occupant protection device. Preferably, it should be possible to determine occupant-specific parameters in a particularly safe and reliable manner. Preferably, the solution should also be able to be integrated into the vehicle in a space-saving and structurally simple manner.

[0006] This object is achieved by an occupant protection device having the features described below. Another aspect of the invention is a seat belt unit according to the invention. The subject of preferred further developments 2 to 9 of the invention. Further advantages and features of the invention will emerge from the general description and the description of the embodiment examples.

[0007] The occupant protection device according to the invention is provided for a motor vehicle, in particular for a passenger car. The occupant protection device comprises at least one adaptive restraint system, which has at least one (adjustable) restraint device and at least one sensor device for detecting at least one occupant-specific parameter and at least one control device. The control device is adapted and configured to control and in particular adjust at least one restraint device according to the occupant-specific parameter at least in the event of an accident. The sensor device comprises at least one fabric pressure sensor. The pressure sensor is (fixedly) integrated into the belt webbing of the seat belt. The pressure sensor in particular provides a large number of spatially distributed (position-specific) pressure signals. The sensor device comprises at least one evaluation unit (which is operably connected to the pressure sensor). The evaluation unit is adapted and configured to record the (position-specific) pressure signal in a spatially resolved manner and determine the pressure distribution (using the spatially resolved recorded pressure signal). The pressure distribution in particular describes the spatial distribution of the force applied to the seat belt by the person wearing the seat belt. The evaluation unit is adapted and configured to provide the pressure distribution as an occupant-specific parameter to the control device for controlling the restraint device. The control device is in particular adapted and configured to take the pressure distribution into account when controlling the at least one restraint device at least in the event of an accident.

[0008] The invention offers numerous advantages. A sensor arrangement with a fabric pressure sensor integrated into a seat belt offers significant advantages. As a result, occupant-specific parameters can be detected safely and reliably. The pressure distribution is also a particularly meaningful parameter for the individual description of the occupant. This enables a very specific adjustment of the restraint system to the individual characteristics of the occupant. It is also particularly advantageous that the pressure sensor can be integrated into the vehicle in a space-saving and at the same time structurally simple manner.

[0009] Preferably and advantageously, the textile pressure sensor is woven into the belt webbing of the seat belt. This allows a particularly reliable integration of the pressure sensor while saving space. In addition, even over large areas of the seat belt, for example over the entire extendable length, the pressure signal can be detected particularly reliably. The pressure sensor extends in particular over at least one third, preferably over at least half, of the length of the seat belt. The pressure sensor comprises in particular at least one fiber arrangement with a plurality of (conductive) fibers. The fibers are in particular textile. These fibers are in particular at least partially incorporated into and preferably woven into the belt webbing.

[0010] At least one restraint device can be designed as a belt tensioner. A belt tensioner is used in particular to tighten and / or retract (or optionally also loosen) a seat belt equipped with a pressure sensor, in particular in the event of an accident.

[0011] At least one restraint device can be designed as an airbag device. The airbag device comprises in particular at least one airbag unit, which can be controlled according to occupant-specific parameters. The airbag device can also comprise two or three or more airbag units. In particular, all of the airbag units can be controlled individually according to occupant-specific parameters.

[0012] At least one restraint device can be configured as a seat positioning device for positioning at least a portion of a seat. The seat positioning device is particularly used for positioning a seat equipped with a seat belt having a pressure sensor. The seat can be partially or completely positioned. For example, the seat surface and / or the backrest and / or the headrest can be adjustable. The seat as a whole can also be adjusted along at least one axis.

[0013] The occupant protection device may also comprise at least two or at least three or more restraint devices, which are preferably all configured as described above. The control device is particularly adapted and configured to control the above configuration of the restraint devices depending on occupant-specific parameters.

[0014] Preferably and advantageously, the control device is adapted and configured to adjust the restraining force of a seat belt (which is equipped with a pressure sensor) as a function of an occupant-specific parameter and preferably at least as a function of the pressure distribution. The control device in particular sets the restraining force such that no unfavorable or dangerous pressure distribution occurs. In addition to at least one occupant-specific parameter, the control device preferably also takes into account other parameters determined by means of sensors, which describe the forces that occur during an accident.

[0015] Preferably and advantageously, the control device is adapted and configured to adjust the airbag pressure and / or the seat position as a function of occupant-specific parameters, preferably at least the pressure distribution. The control device can particularly preferably match the restraining force of the seat belt and the airbag pressure as well as the seat position to one another as a function of the occupant-specific parameters. For example, if the pressure distribution indicates that the person has a particularly heavy weight, the airbag pressure and the restraining force of the seat belt as well as the seat position can be specifically matched to one another. In particular, the restraining force and / or the seat position and / or the airbag pressure detection are controlled based on the force distribution between the chest and the abdomen detected by the integrated pressure sensor.

[0016] In an advantageous configuration, the pressure sensor is integrated into the belt webbing at least at a location where the seat belt extends across the chest and / or abdomen when the seat belt is used as intended. The evaluation unit is particularly adapted and configured to determine the pressure distribution in the chest area of ​​the seat belt and in the abdomen area of ​​the seat belt, respectively. The seat belt particularly comprises at least one intended chest area and at least one intended abdomen area.

[0017] The evaluation unit is preferably adapted and configured to calculate a chest-specific pressure load and an abdomen-specific pressure load based on the pressure distributions in the chest area and the abdomen area, respectively determined. The evaluation unit can in particular determine the occupant-specific parameter based at least on the force distribution or pressure distribution between the chest and the abdomen. The control device is in particular adapted and configured to adjust the restraining force of the seat belt and / or the seat position and / or the airbag pressure based at least on the force distribution or pressure distribution between the chest and the abdomen.

[0018] The evaluation unit can independently identify which part of the pressure sensor is in the chest area and which part of the pressure sensor is in the abdomen area. The evaluation unit can independently determine and define the chest area and the abdomen area of ​​the seat belt based on the detected pressure distribution. In other words, when a person wears the seat belt, the evaluation unit can independently identify which part of the seat belt extends over the chest and which part of the seat belt extends over the abdomen based on the pressure distribution.

[0019] The control device is preferably adapted and configured to adjust the restraining force of the seat belt and / or the seat position and / or the airbag pressure as a function of the chest-specific pressure load and the abdomen-specific pressure load. The adjustment is performed in particular in such a way that in the event of an accident a targeted load distribution can be set between the chest area and the abdomen area of ​​the seat belt. In other words, the control device, knowing the chest-specific pressure load and the abdomen-specific pressure load, makes a targeted adjustment of the corresponding restraining device, thereby avoiding excessive local loads, for example on the chest and abdomen.

[0020] The determination of the occupant-specific parameters described herein is carried out in particular at least in the event of an accident and / or at least when an accident is detected to be imminent. The adjustment of at least one restraint device is carried out in particular as a function of the occupant-specific parameters at least in the event of an accident and / or at least when an accident is detected to be imminent.

[0021] In an advantageous and preferred further development, the control device is adapted and configured to control the at least one restraint device during normal operation (in particular when no accident is detected) as a function of occupant-specific parameters and preferably at least as a function of the pressure distribution. For example, the comfort of a tall, heavy or pregnant person while driving can be significantly improved.

[0022] The control device is preferably adapted and configured to loosen the seat belt in a defined manner and / or to change the seat position in a defined manner during normal operation. The control device can take into account a chest-specific pressure load and / or an abdomen-specific pressure load so that a particularly comfortable pressure distribution between the chest and the abdomen can be set. The control device in particular performs the above-mentioned adjustments if the pressure distribution between the chest and the abdomen is above a limit value.

[0023] The seat belt unit according to the invention comprises at least one seat belt and at least one fabric pressure sensor integrated into the seat belt. The seat belt unit is provided in particular for use with an occupant protection device according to the invention or one of its configurations. The applicant reserves the right to claim the use of a fabric pressure sensor integrated into the seat belt for an occupant protection device. The seat belt and the pressure sensor are in particular configured as described above for the occupant protection device according to the invention.

[0024] The pressure sensor generates a specific change in resistance and / or a specific change in capacitance, in particular as a function of the force acting on it. The pressure sensor then outputs the pressure signal in particular as a voltage signal. The pressure sensor generates a specific change in resistance and / or a specific change in capacitance, in particular as a function of the force acting on it. The change in resistance and / or the change in capacitance in particular causes a defined change in the corresponding voltage signal.

[0025] In the context of the present invention, the term "pressure" can also be replaced by "force". The pressure sensor is in particular a force sensor and serves to determine the force distribution. The force measurement can then be used, for example, not only to monitor the pressure on the seat belt, but also, for example, to monitor the stretching or other deformations of the seat belt.

[0026] The pressure sensor comprises in particular at least one and preferably at least two electrically conductive (textile) fiber arrangements connected to and in particular woven into a resistive and / or capacitive (textile) layer. The layer changes its resistance and / or capacitance in particular depending on the force applied thereto.

[0027] The pressure sensor comprises in particular a large number of measuring points distributed on a detection surface. Each measuring point in particular provides at least one pressure signal (which depends on the pressure on the pressure sensor). The pressure sensor in particular provides a large number of spatially resolved sensor signals and preferably provides voltage signals. The evaluation unit can in particular detect and evaluate the pressure signals in a spatially resolved manner. The evaluation unit can in particular use the detected spatially resolved pressure signals to determine the pressure distribution. The pressure distribution describes in particular the distribution of the individual pressure signals on the detection surface of the pressure sensor. The detection surface of the pressure sensor extends in particular over at least a portion of the seat belt. When used as intended, the detection surface extends in particular at least over a portion of the seat belt that extends across the chest and / or abdomen of a person secured with the seat belt.

[0028] The pressure sensor may also be referred to as a fabric surface sensor. The pressure signal may also be referred to as a sensor signal. The pressure signal is in particular a voltage signal. In addition to the fabric pressure sensor, the sensor device may also comprise at least one further sensor unit for detecting an occupant-specific parameter. The control device may use at least two occupant-specific parameters to form a higher-level parameter. In addition to the occupant-specific parameters, the control device in particular also takes into account at least one parameter detected by means of the sensor, which describes the forces acting during the accident. For example, a sensor device is provided for detecting accelerations or the like.

[0029] The control device and the evaluation unit can be integrated into the control unit or can also be configured separately. The control device and / or the evaluation unit in particular comprise at least one algorithm for carrying out the steps described herein. The control device and / or the evaluation unit are in particular adapted and configured to carry out the steps formulated in a method-like manner. When in the context of the present invention reference is made to measures in the event of an accident, this is in particular also understood to mean that the measures can be carried out when it is recognized that an accident is about to occur.

[0030] The occupant-specific parameters describe in particular the influence of forces or pressures on the seat belt by a person secured with the seat belt in the event of an accident. The seat belt is in particular at least one three-point seat belt. The applicant reserves the right to claim a motor vehicle with an occupant protection device according to the invention. In particular, at least one occupant protection device is provided for at least some of the provided seats.

[0031] In general, the present invention discloses the following technical solutions of Schemes 1 and 10, and the following Schemes 2-9 are preferred technical solutions:

[0032] Solution 1. An occupant protection device for a motor vehicle, the occupant protection device comprising: at least one adaptive restraint system, the at least one adaptive restraint system having at least one restraint device and at least one sensor device for detecting at least one occupant-specific parameter and at least one control device, wherein the control device is adapted and configured to control the at least one restraint device according to the occupant-specific parameter at least in the event of an accident, wherein:

[0033] The sensor device comprises at least one fabric pressure sensor, which is integrated into the belt webbing of the seat belt and provides a large number of spatially distributed pressure signals, and the sensor device comprises at least one evaluation unit, which is adapted and configured to record the pressure signals in a spatially resolved manner and to determine a pressure distribution, which describes the spatial distribution of the force exerted on the seat belt by a person wearing the seat belt, and to provide the pressure distribution as an occupant-specific parameter to the control device for controlling the restraint device.

[0034] Solution 2. The occupant protection device according to Solution 1, wherein the fabric pressure sensor is woven into the belt webbing of the seat belt.

[0035] Solution 3. An occupant protection device according to one of the preceding solutions, wherein the at least one restraint device is configured as a seat belt tensioning device and / or an airbag device and / or a seat positioning device for positioning at least a portion of a seat.

[0036] Solution 4. An occupant protection device according to one of the preceding solutions, wherein the control device is adapted and configured to adjust the restraining force of the seat belt according to the occupant-specific parameters.

[0037] Solution 5. An occupant protection device according to one of the preceding solutions, wherein the control device is adapted and configured to adjust the airbag pressure and / or the seat position according to the occupant-specific parameters.

[0038] Option 6. An occupant protection device according to one of the preceding options, wherein the pressure sensor is integrated into the seat belt webbing at least at a position where the seat belt extends across the chest and abdomen when the seat belt is used as intended, and wherein the evaluation unit is adapted and configured to determine the pressure distribution in the chest area of ​​the seat belt and in the abdomen area of ​​the seat belt, respectively, and to calculate the chest-specific pressure load and the abdomen-specific pressure load therefrom.

[0039] Option 7. An occupant protection device according to Option 6, wherein the control device is adapted and configured to adjust the restraining force of the seat belt and / or the seat position and / or the airbag pressure according to the chest-specific pressure load and the abdomen-specific pressure load, so that in the event of an accident, a targeted load distribution can be set between the chest area and the abdomen area of ​​the seat belt.

[0040] Solution 8. An occupant protection device according to one of the preceding solutions, wherein the control device is adapted and configured to control the at least one restraint device also during normal operation as a function of the occupant-specific parameters and in particular at least the pressure distribution.

[0041] Solution 9. An occupant protection device according to one of the preceding solutions, wherein the control device relaxes the seat belt in a defined manner and / or changes the seat position in a defined manner during normal operation.

[0042] Solution 10. A seat belt unit for an occupant protection device according to one of the aforementioned solutions 1 to 9, the seat belt unit having at least one seat belt and at least one fabric pressure sensor integrated into the seat belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Further advantages and features of the present invention will emerge from the exemplary embodiments discussed below with reference to the accompanying drawings.

[0044] The accompanying drawings show:

[0045] Figure 1 is a purely schematic diagram of a motor vehicle having an occupant protection device according to the invention; and

[0046] Figure 2 is a detailed cross-sectional view of an occupant protection device according to the present invention. DETAILED DESCRIPTION

[0047] Figure 1 A motor vehicle 10 is shown with an occupant protection device 1 according to the invention having an adaptive restraint system 2 during an exemplary accident. For the sake of clarity, the side doors are not included here. A person 20 on a seat 52, in this case the front passenger seat, wears a seat belt 5. The occupant protection device 1 for the front passenger seat is described here only as an example. The driver's seat or at least one rear seat can also be equipped with an occupant protection device 1 in addition or as an alternative.

[0048] As an example only, the restraint system 2 here comprises three restraint devices 12; namely, a belt tensioner 22 and an airbag device 32 and a seat positioning device 42. The belt tensioner 22 is used to pretension or retract the seat belt 5. Here, as an example, only the airbag unit configured as a front airbag in the airbag device 32 is shown. The seat positioning device 42 can be used to position the entire seat 52 or only a part of the seat 52 (e.g. the seat surface, backrest and / or headrest).

[0049] The restraint system 2 comprises a control device 4 which adjusts the restraint device 12 in a targeted manner in the event of an accident according to occupant-specific parameters. This allows the belt tensioning device 22 and the airbag device 32 as well as the seat positioning device 42 to be specifically adjusted to the individual characteristics of the occupant. This significantly reduces the risk of injury to the restrained person in the event of an accident.

[0050] The occupant-specific parameters are detected using a sensor device 3 having one or more sensor units. In order to determine the occupant-specific parameters in a particularly reliable and at the same time uncomplicated and space-saving manner, at least one of the sensor units is configured as a fabric pressure sensor 13. The pressure sensor 13 is here fixedly integrated and, for example, woven into the seat belt 5. The fabric pressure sensor 13 can also be referred to as a surface sensor and provides a plurality of pressure signals that are spatially distributed over the length of the seat belt 5.

[0051] Such a seat belt 5 can also be referred to as a so-called smart fabric. The advantage of the invention proposed here is therefore that the functions of the sensor device 3, in particular the force and pressure measurement, are integrated into the belt webbing 15. In this respect, the seat belt 5 can thus assume new functions.

[0052] The evaluation unit 23 can record the pressure signals in a spatially resolved manner and use them to determine a pressure distribution. The pressure distribution describes the spatial distribution of the force exerted on the seat belt 5 by the person 20 wearing the seat belt. The pressure sensor 13 extends over the seat belt 5 so that, when used as intended, pressure signals can be detected at least at the location where the chest and abdomen of the secured person 20 are located.

[0053] The evaluation unit 21 supplies the determined pressure profile to the control device 4. For example, the evaluation unit 23 is integrated into the control device 4 here. The control device 4 then takes the pressure profile into account alone or together with other occupant-specific parameters detected by means of sensors in order to individually set the restraining force of the seat belt 5 for the person 20. Additionally or alternatively, the airbag pressure and / or the seat position are also adjusted in this way.

[0054] In particular, a communication and interpretation cycle is performed before actuating each restraining device 12. The pressure distribution and other data are interpreted by the control device 4 in a form related to other components of the vehicle 10 and other vehicle parameters, such as speed or the like.

[0055] In an exemplary variant of the occupant protection device 1, the evaluation unit 23 can determine the pressure distribution in the chest region 25 and in the abdomen region 35 of the seat belt 5 separately and use this pressure distribution to calculate the chest-specific pressure load and the abdomen-specific pressure load. In the event of an accident, the restraining force of the seat belt 5 and / or the seat position and / or the airbag pressure can be adjusted so that a targeted load distribution can be set between the chest region 25 and the abdomen region 35 of the seat belt 5. This allows the load on the body of the person 20 wearing the seat belt to be distributed in a particularly advantageous manner.

[0056] In an advantageous variant, the occupant protection device 1 shown here can also be used to increase comfort during normal operation. The control device 4 then sets the restraining force or the seat position, for example, according to the determined pressure distribution, to avoid unfavorable pressure loads on the person 20 wearing the seat belt while driving.

[0057] Figure 2 A seat belt unit 50 is shown, which has a seat belt 5 with a fabric belt webbing 15. The fabric pressure sensor 13 is fixedly integrated and, for example, woven into the seat belt webbing 15. The seat belt unit 50 shown here can, for example, be used in the above-described occupant protection device 1. The pressure sensor 13 is as previously described with reference to Figure 1 A portion of the sensor device 3 is shown here. A cross-sectional view of a seat belt 5 is shown here. For the sake of better illustration, the individual components are not shown to scale.

[0058] For example, the pressure sensor 13 can undergo a targeted resistance change and / or a targeted capacitance change depending on the force acting on it. The pressure sensor 13 comprises, for example, one or at least two textile fiber arrangements 33, each of which comprises a plurality of conductive fibers. Between the fiber arrangements 33 there is a resistive or capacitive layer 43. The layer 43 changes its resistance or capacitance depending on the pressure. The fibers of the fiber arrangement 33 are connected to the evaluation unit 23 individually or in groups, so that spatially resolved detection of pressure signals or voltage signals is possible.

[0059] List of Figure Numbers:

[0060] 1 Occupant protection device 22 Seat belt tensioner

[0061] 2 Restraint system 23 Evaluation unit

[0062] 3 Sensor device 25 chest area

[0063] 4 Control device 32 Airbag device

[0064] 5 Seat belt 33 Fiber layout

[0065] 10 Motor Vehicles 35 Abdominal Area

[0066] 12 Restraint device 42 Seat positioning device

[0067] 13 Pressure Sensor 43 Layer

[0068] 15 Seat belt webbing 50 Seat belt unit

[0069] 20 people 52 seats

Claims

1. An occupant protection device (1) for a motor vehicle (10), the occupant protection device comprising: At least one adaptive restraint system (2) having at least one restraint device (12) and at least one sensor device (3) for detecting at least one occupant-specific parameter and at least one control device (4), wherein the control device (4) is adapted and configured to control the at least one restraint device (12) as a function of the occupant-specific parameter at least in the event of an accident, It is characterized in that The sensor device (3) comprises at least one fabric pressure sensor (13), which is integrated into the seat belt webbing (15) of the seat belt (5) and provides a large number of spatially distributed pressure signals, and the sensor device (3) comprises at least one evaluation unit (23), which is adapted and configured to record the pressure signals in a spatially resolved manner and to determine a pressure distribution, which describes the spatial distribution of the force applied to the seat belt (5) by a person (20) wearing the seat belt, and to provide the pressure distribution as an occupant-specific parameter to the control device (4) for controlling the restraint device (12).

2. The occupant protection device (1) according to claim 1, wherein the fabric pressure sensor (13) is woven into the belt webbing (15) of the seat belt (5).

3. An occupant protection device (1) according to claim 1 or 2, wherein the at least one restraint device (12) is constructed as a seat belt tensioning device (22) and / or an airbag device (32) and / or a seat positioning device (42) for positioning at least a part of a seat (52).

4. The occupant protection device (1) according to claim 1 or 2, wherein the control device (4) is adapted and configured to adjust the restraining force of the seat belt (5) according to the occupant-specific parameters.

5. Occupant protection device (1) according to claim 1 or 2, wherein the control device (4) is adapted and configured to adjust the airbag pressure and / or the seat position as a function of the occupant-specific parameters.

6. An occupant protection device (1) according to claim 1 or 2, wherein the pressure sensor (13) is integrated into the seat belt webbing (15) at least at a position where the seat belt (5) extends across the chest and abdomen when the seat belt (5) is used as intended, and wherein the evaluation unit (23) is adapted and configured to determine the pressure distribution in the chest area (25) of the seat belt (5) and in the abdomen area (35) of the seat belt (5), respectively, and to calculate the chest-specific pressure load and the abdomen-specific pressure load therefrom.

7. An occupant protection device (1) according to claim 6, wherein the control device (4) is adapted and configured to adjust the restraining force of the seat belt (5) and / or the seat position and / or the airbag pressure according to the chest-specific pressure load and the abdomen-specific pressure load, so that in the event of an accident a targeted load distribution can be set between the chest area (25) and the abdomen area (35) of the seat belt (5).

8. An occupant protection device (1) according to claim 1 or 2, wherein the control device (4) is adapted and configured to control the at least one restraint device (12) also during normal operation as a function of the occupant-specific parameters and in particular at least the pressure distribution.

9. Occupant protection device (1) according to claim 1 or 2, wherein the control device (4) during normal operation relaxes the seat belt (5) in a defined manner and / or changes the seat position in a defined manner.

10. A seat belt unit (50) for an occupant protection device (1) according to one of claims 1 to 9, the seat belt unit having at least one seat belt (5) and at least one fabric pressure sensor (13) integrated into the seat belt (5).

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