DE102020201965A1 - Method and device for the automatic adjustment of a vehicle seat - Google Patents

Abstract

The invention relates to a method and a device (1) for the automatic adjustment of a vehicle seat, which comprises at least one adjustable seat element and a seat belt, the at least one adjustable seat element being adjustable by at least one actuator (5). According to the invention, at least one seat sensor (3) detects a movement-relevant physical variable of an occupant sitting on the vehicle seat (20), from which a movement of the occupant sitting on the vehicle seat (20) is determined, the at least one actuator (5) being the at least one adjustable The seat element (22, 24, 26) is adjusted so that it automatically follows the specific movement of the occupant sitting on the vehicle seat (20).

Description

The invention is based on a method for automatically adjusting a vehicle seat according to the preamble of independent claim 1. The present invention also relates to a device for performing the method for automatically adjusting a vehicle seat.

In order to sit comfortably and safely in vehicles and to be able to adapt the seat to passengers of different sizes and weights, vehicle seats are known from the prior art, which are typically equipped with a number of adjustment mechanisms. For example, a seat surface in the vehicle can be moved back and forth, a seat height can be varied, an inclination of the backrest or the height of the headrest can be adjusted. The adjustment mechanisms can be operated manually or hydraulically or by electric motors. For example, occupants can adjust the seat individually to their needs by manually operating controls. It is also possible to save preferred individual seat settings and call them up again later.

In addition, vehicles with at least one highly automated or autonomous driving function are known from the prior art, which can at least partially take over an actual driving task. In such automatically driving vehicles, the occupants can assume seating positions with a greater inclination of the backrest, right up to a reclining position with a flat seat back. In order to ensure occupant safety, it can be assumed that the occupants are protected by a belt system which, in particular, connects the upper body to the seat. In addition, it can happen that occupants who are in a relaxed sitting position with a strongly inclined backrest during automatic driving and who are not actively involved in driving the vehicle, want to sit up in certain situations, for example after unexpected vehicle movements, etc. to get a picture of the situation. According to the current state of the art, the occupant is prevented from getting upright quickly by blocking the belt system. Slow movements of the occupant on the seat are possible without the belt system blocking. This means that it is possible to straighten up slowly, with the backrest remaining in its set position.

Furthermore, approaches for the automatic adjustment of the seat, for example to avoid symptoms of fatigue, are known. For example, from the DE 198 11 959 B4 a method for the automatic adjustment of a seat, in particular a driving or aircraft seat, is known, the seat being adjusted continuously or continuously discontinuously to positions within a predeterminable characteristic map as a function of at least two adjustment parameters, in particular the longitudinal position of the seat, the inclination of the seat back and seat cushion. Here, the characteristic field is determined by a positive range of values of the adjustment parameters in relation to a reference point, in particular the starting position of the seat or the pelvic center of gravity of a person sitting on the seat.

Disclosure of the invention

The method for automatically adjusting a vehicle seat with the features of independent claim 1 and the device for automatically adjusting a vehicle seat with the features of independent claim 9 each have the advantage that adjustable seat elements of the vehicle seat are controlled by the movements of an occupant sitting on the corresponding vehicle seat will. This results in a gain in comfort, since no manual operating elements or switches have to be actuated in order to adjust the vehicle seat individually. As an adjustable seat element, at least one backrest can follow the movement of the occupant sitting on the corresponding vehicle seat. If necessary, a seat cushion or a headrest as adjustable seat elements of the vehicle seat can also follow the movement of the occupant sitting on the corresponding vehicle seat. In order to optimally protect occupants in the event of potential accidents, it is advantageous to “sit with your back on the backrest”. Since the backrest, as an adjustable seat element, can follow the movement of the occupant, in addition to the gain in comfort, improved protection of the occupant can always result with intuitive operation of the vehicle seat.

Particularly in vehicles with assisted, partially automated, automated, partially autonomous and / or autonomous driving functions, the occupants have more freedom in their seating positions and can nevertheless be protected in an accident or critical driving situation by embodiments of the invention. In vehicles with assisted, partially automated, automated, partially autonomous and / or autonomous driving functions, depending on the operating mode of the vehicle, new seating positions are possible, such as a comfort position in which a seat back of the vehicle seat is inclined backwards from the upright (90 °) position and has an angle between 100 ° and 120 °, or to assume a reclining position in which the seat back is tilted backwards very far (over 130 °) from the upright (90 °) position. This allows the occupant a take a more comfortable sitting position. It can be the case here, for example, that the occupant is sitting upright, but the vehicle seat still remains in the comfort position or lying position. In an accident situation or in a critical driving situation, the occupant then has less support and there is a risk of a neck and / or neck injury. This can be prevented in an advantageous manner by embodiments of the invention, since the angle of inclination of the backrest can be adapted to the movement of the occupant sitting on the corresponding vehicle seat.

Embodiments of the present invention provide a method for the automatic adjustment of a vehicle seat which comprises at least one adjustable seat element and a seat belt. The at least one adjustable seat element can be adjusted by at least one actuator. In this case, at least one seat sensor detects a movement-relevant physical variable of an occupant sitting on the vehicle seat, from which a movement of the occupant sitting on the vehicle seat is determined, the at least one actuator adjusting the at least one adjustable seat element in such a way that it automatically corresponds to the determined movement of the vehicle seat the vehicle seat occupant follows.

In addition, a device for the automatic adjustment of a vehicle seat, which comprises at least one adjustable seat element and a seat belt, is proposed which is suitable for carrying out the method for the automatic adjustment of a vehicle seat. The device comprises an evaluation and control unit and at least one actuator, the evaluation and control unit being suitable for controlling the at least one actuator in order to adjust the at least one adjustable seat element. At least one seat sensor detects a movement-relevant physical variable of an occupant sitting on the vehicle seat and outputs corresponding sensor signals to the evaluation and control unit. The evaluation and control unit is suitable for determining the movement of the occupant sitting on the vehicle seat from the at least one recorded movement-relevant physical variable and for controlling the at least one actuator so that it adjusts the at least one adjustable seat element so that it automatically follows the determined movement of the occupant sitting on the vehicle seat follows.

An occupant of a vehicle can be understood to mean a driver of the vehicle or a passenger in the vehicle. In vehicles with assisted, partially automated, automated, partially autonomous and / or autonomous driving functions, the proportion of automated vehicle functions increases from a manual operating mode to an assisted operating mode, a partially autonomous operating mode to an autonomous operating mode. A partially autonomous operating mode can also be understood as a partially automated operating mode. For example, driver assistance systems for longitudinal guidance and / or lateral guidance can be activated in the vehicle in the partially automated operating mode, with the driver being able to take control at any time. An autonomous operating mode can also be understood to mean an automated operating mode. An automated operating mode can be understood to mean both a highly automated operating mode and a fully automated operating mode.

In the present case, the evaluation and control unit can be understood to mean an electrical device, such as a control device, in particular a seat control device, which processes or evaluates detected sensor signals. For this purpose, the evaluation and control unit can have at least one processing unit for processing signals or data, at least one storage unit for storing signals or data, at least one interface to a sensor or an actuator for reading in sensor signals from the sensor or for outputting control signals to the Have actuator and / or at least one communication interface for reading in or outputting data, which are embedded in a communication protocol. The at least one interface can be designed in terms of hardware and / or software. In the case of a hardware design, the interfaces can be part of a so-called system ASIC, for example, which contains a wide variety of functions of the evaluation and control unit. However, it is also possible that the interfaces are separate, integrated circuits or at least partially consist of discrete components. In the case of a software-based design, the interfaces can be software modules that are present, for example, on a microcontroller alongside other software modules. The computing unit can be, for example, a signal processor, a microcontroller or the like, wherein the storage unit can be a flash memory, an EEPROM or a magnetic storage unit. The communication interface can be designed to read in or output data wirelessly and / or wired, a communication interface that can read in or output wired data, for example, can read this data electrically or optically from a corresponding data transmission line or output it into a corresponding data transmission line. A computer program product with program code, which is stored on a machine-readable storage medium such as a semiconductor memory, a hard disk memory or an optical memory, and for carrying out the method for adapting, is also advantageous a seating position of an occupant of a vehicle is used at an accident risk when the program is executed by the evaluation and control unit.

The measures and developments listed in the dependent claims allow advantageous improvements of the method for the automatic adjustment of a vehicle seat specified in the independent claim 1 and the device for the automatic adjustment of a vehicle seat specified in the independent claim 9.

It is particularly advantageous that the at least one seat sensor can continuously detect a belt force which can be evaluated to determine the movement of the occupant sitting on the vehicle seat. Force sensors integrated in the seat, which are arranged, for example, at the attachment points of the seat belt, can be used to measure the force on the seat belt that the occupant applies when he moves. This movement can then be converted into an adjustment of the inclination of the backrest, for example, via the at least one actuator. In this way, the occupant can adjust the seat intuitively by moving. In particular, raising the backrest from the rest position while driving in automatic vehicles can take place comfortably in this way.

Additionally or alternatively, the at least one seat sensor can continuously detect a pressure force in the at least one adjustable seat element of the vehicle seat, which pressure force can be evaluated to determine the movement of the occupant sitting on the vehicle seat. In this case, the backrest can follow the occupant when the load is relieved, which is detected when the occupant moves away from the backrest and thus applies less pressure to the backrest by a corresponding control of the at least one actuator or a suitable spring arrangement. In order to prevent accidental adjustment of the adjustable seat elements, the sensor signals can be filtered and processed accordingly.

In an advantageous embodiment of the method, the recorded belt force can be kept constant by adjusting the at least one seat element as soon as the recorded belt force exceeds a predetermined threshold value. This enables the belt force to be evaluated quickly and easily. As the occupant moves against the seat belt, for example when getting up from the lying position, the belt forces will increase. This increase in force is detected and converted into a corresponding movement of the backrest. Of course, more complex algorithms for signal processing or conditioning are also conceivable. In addition, the detected pressure force can also be kept constant by adjusting the at least one seat element as soon as the detected pressure force falls below a predetermined threshold value.

In a further advantageous embodiment of the method, the recorded belt force and / or the recorded pressure force can be correlated with further movement data and / or environment data of the vehicle recorded in the vehicle. Due to the correlation with the recorded movement data and / or environment data, the probability of inadvertent adjustment of the adjustable seat elements can be further reduced. In addition, the at least one seat element can be moved into a protective position and blocked there if an accident situation or a critical driving situation is recognized by evaluating the movement data and / or the environment data.

In a further advantageous embodiment of the method, the at least one seat element can be adjusted accordingly when a manual operating device is actuated. In addition to the automatic adjustment of the vehicle seat, the vehicle seat can also be adjusted manually. In addition, the automatic adjustment can also be deactivated and reactivated via a corresponding manual actuation.

In an advantageous embodiment of the device, different sensor combinations can be used. For example, to adjust the backrest, a first seat sensor designed as a force sensor can be installed in a belt attachment on the shoulder to be ordered. Here, the evaluation and control unit can keep the recorded belt force constant via the at least one actuator by adjusting the seat element designed as a backrest as soon as the recorded belt force exceeds a predetermined threshold value. For example, the first seat sensor designed as a force sensor can be integrated into a belt attachment designed as a belt retractor in the shoulder area. By moving the occupant against the seat belt when getting up from the lying position, the belt forces will increase, especially in the shoulder area. This can be detected in the evaluation and control unit and converted into a corresponding movement of the backrest.

In a further advantageous embodiment of the device, further directions of movement can be evaluated and the corresponding adjustable seat elements can be adjusted. For example, two seat sensors designed as a force sensor can be arranged in a first pelvic belt attachment and / or a third seat sensor designed as a force sensor can be arranged in a second pelvic belt attachment. Here, the evaluation and control unit can keep the recorded belt force constant via the at least one actuator by adjusting a seat element designed as a seat cushion as soon as the recorded belt force exceeds a predetermined threshold value. For example, the second seat sensor, designed as a force sensor, can be integrated into a belt lock and the third seat sensor, designed as a force sensor, can be integrated into a belt anchorage. By evaluating the additional belt forces of the second and / or third seat sensor, the seat cushion can, for example, be moved forwards or backwards or upwards or downwards, or the inclination of the seat cushion can be changed.

In a further advantageous embodiment of the device, a fourth seat sensor embodied as a pressure sensor can be arranged in the seat element embodied as a backrest. Here, the evaluation and control unit can keep the detected pressure force constant via the at least one actuator by adjusting the seat element designed as a backrest as soon as the detected pressure force falls below a predetermined threshold value.

In a further advantageous embodiment of the device, the evaluation and control unit in the vehicle can receive movement data and / or environment data from other vehicle systems and correlate them with the detected belt force and / or the detected pressure force. In particular, information from an airbag system, from an occupant protection system, from vehicle dynamics control systems, from an environment monitoring system, etc. can be received and evaluated to control the at least one actuator. In addition, the evaluation and control unit can move the at least one seat element into a protective position via the at least one actuator and block it there if an accident situation or a critical driving situation is detected by evaluating the movement data and / or the environment data.

In a further advantageous embodiment of the device, the evaluation and control unit can be coupled to a manual operating device and, when an actuation is detected, the at least one seat element can be adjusted accordingly via the at least one actuator. In addition, the activation of the automatic adjustment of the vehicle seat can be activated and deactivated by an operating element such as a switch or button.

Exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the following description. In the drawing, the same reference symbols designate components or elements that perform the same or analogous functions.

Figure list

• 1 shows a schematic flow diagram of an embodiment of a method according to the invention for the automatic adjustment of a vehicle seat.
• 2 shows a schematic block diagram of an embodiment of a device according to the invention for the automatic adjustment of a vehicle seat.
• 3 FIG. 11 shows a perspective illustration of an exemplary embodiment of a vehicle seat with the device according to the invention for the automatic adjustment of a vehicle seat from FIG 2 .

Embodiments of the invention

How out 1 until 3 As can be seen, the illustrated embodiment comprises a method according to the invention 100 for the automatic adjustment of a vehicle seat 20th , which has at least one adjustable seat element 22nd , 24 , 26th and a seat belt 30th includes one step S100 , in which at least one seat sensor 3 , 3A , 3B , 3C , 3D a movement-relevant physical variable on the vehicle seat 20th seated occupant captured. In step S200 the sensor data are evaluated and a movement of the on the vehicle seat 20th seated occupants. In step S300 are control signals for the at least one actuator 5 for adjusting the at least one adjustable seat element 22nd , 24 , 26th determined. In step S400 adjusts the at least one actuator 5 the at least one adjustable seat element 22nd , 24 , 26th so that this automatically follows the specific movement of the vehicle seat 20th seated occupant follows.

How out 2 and 3 As can be seen, the illustrated embodiment comprises a device 1 according to the invention, which is used to carry out the method according to the invention 100 for the automatic adjustment of a vehicle seat 20th , which has at least one adjustable seat element 22nd , 24 , 26th and a seat belt 30th includes, is suitable, an evaluation and control unit 10 and at least one actuator 5 . The evaluation and control unit 10 is suitable for adjusting the at least one adjustable seat element 22nd , 24 , 26th the at least one actuator 5 head for. At least one seat sensor detects this 3 , 3A , 3B , 3C , 3D a movement-relevant physical variable on the vehicle seat 20th seated occupant and sends corresponding sensor signals to the evaluation and control unit 10 the end. The evaluation and control unit 10 determines the movement of the on the vehicle seat from the at least one detected movement-relevant physical variable 20th seated Occupant and controls the at least one actuator 5 so that it has at least one adjustable seat element 22nd , 24 , 26th adjusted so that this automatically follows the specific movement of the vehicle seat 20th seated occupant follows.

How out 3 can also be seen, includes the vehicle seat 20th in the illustrated embodiment of the device 1 as a seat cushion 22A executed first adjustable seat element 22nd , one as a backrest 24A executed second adjustable seat element 24 and one as a headrest 26A executed third adjustable seat element 26th . How out 3 can also be seen is a first seat sensor designed as a force sensor 3A in one example as a belt retractor 36A carried out shoulder-side belt attachment 36 arranged. In addition, in the illustrated embodiment of the device 1, there is a second seat sensor designed as a force sensor 3B in one as a belt lock 32A executed first pelvic belt attachment 32 arranged. A third seat sensor designed as a force sensor 3C is in one as a belt anchorage 34A executed second pelvic belt attachment 34 arranged. There is also a fourth seat sensor designed as a pressure sensor 3D in that as a backrest 24A executed second seat element 24 arranged. In the illustrated embodiment, the seat sensors are 3 , 3A , 3B , 3C , 3D via direct connection lines DV electrical with the evaluation and control unit 10 tied together. Also the at least one actuator 5 is via a direct connection line DV with the evaluation and control unit 10 tied together.

Thus, in the exemplary embodiments shown, the first, second and third seat sensors detect 3A , 3B , 3C in step S100 one belt force continuously in the seat belt 30th , which from the evaluation and control unit 10 in step S200 to determine the movement of the on the vehicle seat 20th seated occupant is evaluated. In addition, the fourth seat sensor records 3D in the illustrated embodiment in step S100 continuously a compressive force in the backrest 24A executed second adjustable seat element 24 of the vehicle seat 20th , which from the evaluation and control unit 10 in step S200 in addition to determining the movement of the on the vehicle seat 20th seated occupant is evaluated.

In the illustrated embodiment, the in the first seat sensor 3A recorded belt force by adjusting the inclination of the backrest 24A executed second seat element 24 kept constant as soon as the recorded belt force exceeds a specified threshold value. That means that the evaluation and control unit 10 in the illustrated embodiment in step S300 a control signal for the at least one corresponding actuator 5 generated in the step S400 the inclination of the backrest 24 adjusted accordingly. This is done by the first seat sensor 3A recorded belt force by adjusting the backrest 24 kept constant as soon as the recorded belt force exceeds a specified threshold value.

In an alternative embodiment, not shown, is the fourth seat sensor 3D recorded pressure force by adjusting the inclination of the backrest 24A executed second seat element 24 kept constant as soon as the detected compressive force falls below a specified threshold value. That means that the evaluation and control unit 10 in this alternative embodiment in step S300 a control signal for the at least one corresponding actuator 5 generated in the step S400 the inclination of the backrest 24 adjusted accordingly. This is done by the fourth seat sensor 3D recorded belt force by adjusting the backrest 24 kept constant as soon as the detected compressive force falls below a specified threshold value.

In the illustrated embodiment, the evaluation and control unit evaluates 10 also in the fourth seat sensor 3D recorded pressure force to adjust the backrest 24A the end. That means that the evaluation and control unit 10 the recorded belt force with the recorded compressive force in the crotch S300 correlated to the tilt of the backrest 24 via the at least one corresponding actuator 5 to be adjusted accordingly. That means the backrest 24A is only adjusted if the evaluation of the sensor signals shows that both seat sensors 3A , 3D indicate a corresponding movement of the occupant. This can reduce the likelihood of accidental adjustment of the backrest 24A be reduced. The likelihood of accidental adjustment of the backrest 24A is further reduced in the illustrated embodiment that in the optional step S110 further movement data and / or environment data of the vehicle can be recorded and made available. In the exemplary embodiment shown, this data is obtained from other vehicle systems 7th , such as provided by an occupant protection system, vehicle dynamics control systems, an environment monitoring system, etc. via a data bus DB. The evaluation and control unit 10 keeps the recorded belt force data, compressive force data, movement data and environmental data in the crotch S200 together and correlates the recorded belt force and the recorded pressure force with the recorded movement data and environmental data. This enables the evaluation and control unit 10 the backrest 24 via the corresponding at least one actuator 5 Adjust to a protective position and block there if by evaluating the movement data and / or the surrounding data an accident situation or a critical driving situation is recognized.

In the illustrated embodiment, the second and third seat sensors 3B , 3C further directions of movement are evaluated and a corresponding adjustment of the corresponding seat cushion 22A executed first adjustable seat element 22nd be made. This is how the evaluation and control unit holds 10 through the two seat sensors 3B , 3C recorded belt forces via the at least one corresponding actuator 5 by adjusting the seat cushion 22A constant as soon as the recorded belt force exceeds a specified threshold value. By evaluating the additional belt forces of the second and third seat sensors 3B , 3C can the seat cushion 22A for example, moved forward or backward or up or down or an inclination of the seat cushion 22nd to be changed.

In a further exemplary embodiment, not shown, in the headrest 26A a fifth seat sensor, not shown, designed as a pressure sensor can be provided. The pressure force detected in the fifth seat sensor can be adjusted by adjusting the inclination of the headrest 26A executed third adjustable seat element 26th kept constant as soon as the detected compressive force falls below a specified threshold value. That means that the evaluation and control unit 10 in this alternative embodiment in step S300 a control signal for the at least one corresponding actuator 5 generated in the step S400 the inclination of the headrest 24 adjusted accordingly.

How out 1 and 2 can be seen further in an optional step S120 Actuations of a manual operating device 9 are recorded. If such actuation of the manual operating device 9 is detected, step S300 the corresponding control signals for the at least one corresponding actuator 5 generated in the step S400 the at least one corresponding seat element 22nd , 24 , 26th adjusted according to manual actuation. In addition, the manual operating device 9 can be used to automatically adjust the vehicle seat 20th activated and deactivated.

The at least one actuator 5 is preferably designed as an electric servomotor. Of course, other suitable hydraulic, pneumatic or electrical drives or spring elements can also be used for adjusting the corresponding adjustable seat element 22nd , 24 , 26th be used.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 19811959 B4 [0004]

Claims (15)

Method (100) for the automatic adjustment of a vehicle seat (20), which comprises at least one adjustable seat element (22, 24, 26) and a seat belt (30), the at least one adjustable seat element (22, 24, 26) by at least one actuator (5) is adjustable, characterized in that at least one seat sensor (3) detects a movement-relevant physical variable of an occupant sitting on the vehicle seat (20), from which a movement of the occupant sitting on the vehicle seat (20) is determined, the at least an actuator (5) adjusts the at least one adjustable seat element (22, 24, 26) in such a way that it automatically follows the specific movement of the occupant sitting on the vehicle seat (20). Method (100) according to Claim 1 , characterized in that the at least one seat sensor (3) continuously detects a belt force which is evaluated to determine the movement of the occupant sitting on the vehicle seat (20). Method (100) according to Claim 1 or 2 , characterized in that the at least one seat sensor (3) continuously detects a pressure force in the at least one adjustable seat element (22, 24, 26) of the vehicle seat (20), which is evaluated to determine the movement of the occupant sitting on the vehicle seat (20) will. Method (100) according to Claim 2 or 3 , characterized in that the recorded belt force is kept constant by adjusting the at least one seat element (22, 24, 26) as soon as the recorded belt force exceeds a predetermined threshold value. Method (100) according to Claim 3 or 4th , characterized in that the detected pressure force is kept constant by adjusting the at least one seat element (22, 24, 26) as soon as the detected pressure force falls below a predetermined threshold value. Method (100) according to one of the Claims 2 until 5 , characterized in that the recorded belt force and / or the recorded pressure force are correlated with further movement data and / or environment data of the vehicle recorded in the vehicle. Method (100) according to Claim 6 , characterized in that the at least one seat element (22, 24, 26) is adjusted to a protective position and blocked there if an accident situation or a critical driving situation is detected by evaluating the movement data and / or the environment data. Method (100) according to one of the Claims 1 until 7th , characterized in that the at least one seat element (22, 24, 26) is adjusted accordingly when a manual operating device (9) is actuated. Device (1) for the automatic adjustment of a vehicle seat (20), which comprises at least one adjustable seat element (22, 24, 26) and a safety belt (30), the device (1) being suitable for the method according to one of the Claims 1 until 8th and an evaluation and control unit (10) and at least one actuator (5), wherein the evaluation and control unit (10) is suitable for adjusting the at least one adjustable seat element (22, 24, 26) the at least one actuator ( 5), characterized in that at least one seat sensor (3) detects a movement-relevant physical variable of an occupant sitting on the vehicle seat (20) and outputs corresponding sensor signals to the evaluation and control unit (10), the evaluation and control unit (10 ) is suitable for determining the movement of the occupant sitting on the vehicle seat (20) from the at least one detected movement-relevant physical variable and for controlling the at least one actuator (5) in such a way that it accommodates the at least one adjustable seat element (22, 24, 26) adjusted so that it automatically follows the specific movement of the occupant sitting on the vehicle seat (20). Device (1) according to Claim 9 , characterized in that a first seat sensor (3A) designed as a force sensor is arranged in a belt attachment (36) on the shoulder. Device (1) according to Claim 9 or 10 , characterized in that a second seat sensor (3B) designed as a force sensor is arranged in a first pelvic belt attachment (32) and / or a third seat sensor (3C) designed as a force sensor is arranged in a second pelvic belt attachment (34). Device (1) according to one of the Claims 9 until 11 , characterized in that a fourth seat sensor (3D) designed as a pressure sensor is arranged in the seat element (24) designed as a backrest (24A). Device (1) according to one of the Claims 9 until 12th , characterized in that the evaluation and control unit (10) receives movement data and / or environment data recorded in the vehicle from other vehicle systems (7) and correlates them with the recorded belt force and / or the recorded pressure force. Device (1) according to Claim 13 , characterized in that the evaluation and control unit (10) moves at least one seat element (22, 24, 26) into a protective position via the at least one actuator (5) and blocks it there if a Accident situation or a critical driving situation is detected. Device (1) according to one of the Claims 9 until 14th , characterized in that the evaluation and control unit (10) is coupled to a manual operating device (9) and when an actuation is detected, the at least one seat element (22, 24, 26) is adjusted accordingly via the at least one actuator (5) or the Method (100) according to one of the Claims 1 until 8th activated.

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