A seat belt force limiting system, seat assembly, and vehicle

Abstract

The application provides a seat belt force limiting system, a seat assembly and a vehicle, which comprises: a winding mechanism configured to wind a seat belt; and a force limiting assembly connected to the winding mechanism and configured to limit the tension of the seat belt. The force limiting assembly has a first force limiting state and a second force limiting state. When the angle of a seat back is greater than or equal to a preset threshold, the force limiting assembly is in the first force limiting state. When the angle of the seat back is less than the preset threshold, the force limiting assembly is in the second force limiting state. The force limiting value of the first force limiting state is less than the force limiting value of the second force limiting state. The safety of the system is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a seat belt force limiting system, a seat assembly, and a vehicle. Background Technology

[0002] As users increasingly demand greater comfort in vehicle cockpits, more and more vehicles are equipped with zero-gravity seats. The difference between zero-gravity seats and ordinary seats is that not only can the backrest be adjusted to a large angle, but the seat cushion is also adjustable, simulating a near-weightless lying posture to alleviate fatigue and improve ride comfort. However, in the event of a collision, the human body will sink in a zero-gravity posture, altering the direction of force on the seatbelt webbing, leading to a significantly increased risk of serious injury and lower safety. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a seatbelt force limiting system to improve safety. Furthermore, a seat assembly and a vehicle are proposed.

[0004] Firstly, in the first aspect, a seatbelt force limiting system is proposed, comprising:

[0005] A retraction mechanism used to retract seat belts;

[0006] A force-limiting component, connected to the retraction mechanism, is used to limit the tension of the seat belt;

[0007] The force limiting component has a first force limiting state and a second force limiting state. When the seat back angle is greater than or equal to a preset threshold, the force limiting component is in the first force limiting state; when the seat back angle is less than the preset threshold, the force limiting component is in the second force limiting state. The force limiting value of the first force limiting state is less than the force limiting value of the second force limiting state.

[0008] The above technical solution addresses the issue that when the seat back angle is greater than or equal to a preset threshold, the pulling force transmitted to the retractor is relatively small. This first force-limiting state, with its smaller force value, prevents excessive pulling force from being applied to the human body during a collision, thus avoiding secondary injuries such as sprains and fractures. Conversely, when the seat back angle is less than the preset threshold, the pulling force transmitted to the retractor is relatively large. This second force-limiting state, with its larger force value, prevents the seatbelt webbing from being pulled out too far under greater deceleration, thus preventing injuries such as forward impact injuries to the occupant. Therefore, the normal operation of the seatbelt force-limiting function is ensured under different backrest angles, effectively reducing the injury caused by the webbing to the human body during a collision and improving safety.

[0009] Optionally, the force limiting component includes a first force limiting rod and a second force limiting rod, wherein the force limiting value of the first force limiting rod is less than that of the second force limiting rod; when the force limiting component is in the first force limiting state, the force limiting component limits the tension of the seat belt through the first force limiting rod; when the force limiting component is in the second force limiting state, the force limiting component limits the tension of the seat belt through the second force limiting rod.

[0010] Optionally, the winding mechanism includes a locking frame and a winding drum, the winding drum being rotatably connected to the locking frame, a first force limiting rod and a second force limiting rod being connected to a connecting portion, the end of the second force limiting rod away from the connecting portion being connected to the locking frame, and the end of the first force limiting rod away from the connecting portion being connected to the winding drum; when the connecting portion is connected to the winding drum, the force limiting component is in the second force limiting state; when the connecting portion is disengaged from the winding drum, the force limiting component is in the first force limiting state.

[0011] Optionally, the force limiting component further includes a force limiting adjustment mechanism, which is used to connect or disconnect the connecting part and the winding drum.

[0012] Optionally, the seatbelt force limiting system further includes a force limiting control unit connected to the force limiting component. The force limiting control unit includes a first input port and a second input port. The first input port is used to acquire the seat back angle signal, and the second input port is used to acquire a collision signal. When the force limiting control unit acquires a signal that the seat back angle is greater than or equal to a preset threshold and a collision signal, the force limiting control unit controls the force limiting component to switch to the first force limiting state; otherwise, the force limiting component is in the second force limiting state.

[0013] Optionally, the force limiting control unit further includes a force limiting trigger unit. When the force limiting control unit obtains a signal that the seat back angle is greater than or equal to a preset threshold and a collision signal from a collision sensor, the force limiting trigger unit drives the force limiting component to switch to the first force limiting state.

[0014] Optionally, the seat belt force limiting system further includes a pretensioning control unit, which is used to drive the seat belt to pretension when a collision signal from a collision sensor is acquired. The force limiting control unit is connected to the pretensioning control unit. When a signal is acquired from a seat back angle sensor that detects a seat back angle greater than or equal to a preset threshold and a collision signal from a collision sensor, the force limiting control unit controls the pretensioning control unit to drive the seat belt to pretension and drives the force limiting component to switch to the first force limiting state.

[0015] Optionally, the force limiting range of the first force limiting rod is 3KN-3.5KN, and / or the force limiting range of the second force limiting rod is 4KN-4.5KN.

[0016] Secondly, a seat assembly is proposed, including the aforementioned seatbelt force limiting system. This seat assembly has the same beneficial effects as the aforementioned seatbelt force limiting system. The aforementioned seatbelt force limiting system is connected to the seat body and can better adapt to the safety protection requirements of zero-gravity seats.

[0017] Thirdly, a vehicle assembly is proposed, including a seatbelt force limiting system as described above or a seat assembly as described above. The vehicle has the same beneficial effects as the aforementioned seatbelt force limiting system or the aforementioned seat assembly.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the structure of a seatbelt force limiting system according to an embodiment of this application;

[0021] Figure 2 This is a control logic flowchart of a seat belt force limiting system according to an embodiment of this application;

[0022] Figure 3 This is a first system architecture block diagram of a seatbelt force limiting system according to an embodiment of this application;

[0023] Figure 4 This is a second system architecture block diagram of a seatbelt force limiting system according to an embodiment of this application;

[0024] Figure 5 This is a block diagram of a third system architecture for a seatbelt force limiting system according to an embodiment of this application.

[0025] Figure label:

[0026] 101. Force limiting assembly; 1011. First force limiting bar; 1012. Second force limiting bar; 1013. Connecting part; 10. Seat back angle sensor; 20. Collision sensor; 30. First ECU; 40. Second ECU; 50. Pretension control unit; 60. Force limiting control unit; 70. Force limiting adjustment mechanism; 80. Rewinding mechanism; 801. Locking frame; 802. Rewinding drum; 90. Seat belt. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0028] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] Please see Figure 1 This application proposes a seatbelt force limiting system, comprising:

[0031] A winding mechanism 80 is used to wind up the safety belt 90;

[0032] Force limiting component 101, connected to the retraction mechanism 80, is used to limit the tension of the seat belt 90;

[0033] The force limiting component 101 has a first force limiting state and a second force limiting state. When the seat back angle is greater than or equal to a preset threshold, the force limiting component 101 is in the first force limiting state; when the seat back angle is less than the preset threshold, the force limiting component 101 is in the second force limiting state. The force limiting value of the first force limiting state is less than the force limiting value of the second force limiting state.

[0034] The above technical solution ensures that when the seat back angle is greater than or equal to a preset threshold, the pulling force transmitted to the retractor is relatively small. This first force-limiting state, with its smaller force value, prevents excessive pulling force from being applied to the human body during a collision, thus avoiding secondary injuries such as sprains and fractures. Conversely, when the seat back angle is less than the preset threshold, the pulling force transmitted to the retractor is relatively large. This second force-limiting state, with its larger force value, prevents the seatbelt webbing from being pulled out too far under greater deceleration, thus preventing injuries such as forward collisions and impacts to the occupant. Therefore, it ensures the normal operation of the seatbelt force-limiting function under different backrest angles, effectively reducing the injury caused by the seatbelt (webbing) to the human body during a collision and improving safety.

[0035] It is understood that the seat back angle is the angle between the backrest and the vertical. For example, a preset threshold is 35°. When the backrest angle is adjusted to 35° or higher, the system defines it as a zero-gravity sitting posture. The force limiting component 101 switches to a smaller seatbelt force, preventing excessive pulling force on the occupant during a collision and better protecting their safety. When the backrest angle is adjusted to less than 35°, the system defines it as a normal sitting posture, maintaining a larger seatbelt force through the force limiting component 101. This prevents the seatbelt webbing from being pulled out excessively during a collision, avoiding injuries such as forward impact injuries. Therefore, it also effectively protects passengers in a normal sitting posture. This seatbelt force limiting system ensures occupant safety in both postures, improving occupant protection in a zero-gravity posture. The backrest angle can be obtained through a seat backrest angle sensor or the seat ECU, or by a limiting transmission structure to determine if the backrest angle is greater than or equal to a preset threshold. Please refer to [link to relevant documentation]. Figure 2 The control method for this seatbelt force limiting system is as follows:

[0036] Step S100: Obtain the seat back angle;

[0037] Step S200: Determine whether the seat back angle is greater than or equal to 35°; if yes, proceed to step S300; if no, proceed to step S400.

[0038] Step S300: The force limiting component switches to the first force limiting state;

[0039] Step S400: The force limiting component remains in the second force limiting state.

[0040] This seatbelt force limiting system ensures that the force limiting function of the seatbelt operates normally in both normal and zero-gravity seating positions, effectively reducing the injury to the human body caused by the webbing during a collision.

[0041] In some embodiments, the force limiting component 101 includes a first force limiting rod 1011 and a second force limiting rod 1012, wherein the force limiting value of the first force limiting rod 1011 is less than that of the second force limiting rod 1012. When the force limiting component 101 is in the first force limiting state, the force limiting component 101 limits the tension of the seat belt 90 through the first force limiting rod 1011; when the force limiting component 101 is in the second force limiting state, the force limiting component 101 limits the tension of the seat belt 90 through the second force limiting rod 1012. This solution achieves different force limiting states through force limiting rods with different force limiting values. The force limiting values ​​are stable and easy to control. Compared with motor-driven clamping mechanisms, it is low in cost, lightweight, and occupies little space.

[0042] In some embodiments, the winding mechanism 80 includes a locking frame 801 and a winding drum 802. The winding drum 802 is rotatably connected to the locking frame 801. A first force-limiting rod 1011 and a second force-limiting rod 1012 are connected to a connecting portion 1013. One end of the second force-limiting rod 1012 away from the connecting portion 1013 is connected to the locking frame 801, and one end of the first force-limiting rod 1011 away from the connecting portion 1013 is connected to the winding drum 802. When the connecting portion 1013 is connected to the winding drum 802, the force-limiting component 101 is in the second force-limiting state; when the connecting portion 1013 is disengaged from the winding drum 802, the force-limiting component 101 is in the first force-limiting state. This design is compact and occupies little space. It should be noted that when the connecting part 1013 is connected to the winding drum 802, since the end of the first force limiting rod 1011 away from the connecting part 1013 is also connected to the winding drum 802, when the winding drum 802 rotates, both ends of the first force limiting rod 1011 rotate simultaneously, and no torque is generated. However, when one end of the connecting part 1013 of the second force limiting rod 1012 rotates and the other end is locked, torque is generated. The second force limiting rod 1012 undergoes torsional energy absorption, and the force limiting assembly 101 is activated. The tension of the seat belt 90 is limited by the second force limiting bar 1012; when the connecting part 1013 is disengaged from the winding drum 802, the first force limiting bar 1011 and the second force limiting bar 1012 work together. Since the force limiting value of the first force limiting bar 1011 is less than that of the second force limiting bar 1012, the system first absorbs energy through torsion by the first force limiting bar 1011, that is, it limits the tension of the seat belt 90 by the first force limiting bar 1011. When the force limiting value of the first force limiting bar 1011 is reached, the force limiting begins.

[0043] In some embodiments, the force limiting component 101 further includes a force limiting adjustment mechanism 70, which is used to connect or disconnect the connecting part 1013 and the winding drum 802. This solution can better ensure the stable connection and timely disconnection of the connecting part 1013 and the winding drum 802. Specifically, the force limiting adjustment mechanism 70 includes an adjusting plate and a sleeve, the sleeve being disposed inside the winding drum; the connecting part is connected to the sleeve; different positions of the adjusting plate can realize the connection or disconnection of the sleeve and the winding drum, thereby realizing the connection or disconnection of the connecting part 1013 and the winding drum 802.

[0044] In other embodiments, the connecting part 1013 may be made of shape memory alloy. Under certain conditions, the connecting part 1013 opens and connects with the inner wall of the winding drum 802. Under other conditions, the connecting part 1013 contracts and disengages from the winding drum 802.

[0045] In some embodiments, please refer to Figure 1 and Figure 3 The seatbelt force limiting system also includes a force limiting control unit 60, which is connected to the force limiting component 101. The force limiting control unit 60 includes a first input port and a second input port. The first input port is used to acquire the seat back angle signal, and the second input port is used to acquire the collision signal from the collision sensor 20. When the force limiting control unit 60 acquires a signal indicating that the seat back angle is greater than or equal to a preset threshold and a collision signal, the force limiting control unit 60 controls the force limiting component 101 to switch to the first force limiting state; otherwise, the force limiting component 101 is in the second force limiting state. This solution triggers the force limiting component 101 to switch force limiting states when the seat back angle is greater than or equal to the preset threshold and a collision signal is acquired, avoiding frequent switching of force limiting states when adjusting the seat, resulting in lower energy consumption and longer lifespan and higher reliability of related components. The collision signal can be acquired by the collision sensor 20 or a signal predicted by a processor from other sensors. It should be noted that the force limiting control unit 60 can be one or more controllers, or a trigger capable of acting based on the acquired signals.

[0046] In some embodiments, please refer to Figure 4 The force limiting control unit 60 further includes a force limiting detonation unit. When the force limiting control unit 60 receives a signal that the seat back angle is greater than or equal to a preset threshold and a collision signal from the collision sensor 20, the force limiting detonation unit drives the force limiting component 101 to switch to the first force limiting state. This solution, through the force limiting detonation unit, can respond quickly and improve the safety of collisions occurring in zero-gravity postures (reclining positions).

[0047] For example, the input terminals of the force limiting control unit 60 are connected to a first ECU 30 and a second ECU 40, respectively. The first ECU 30 is connected to a seat back angle sensor 10 to obtain the seat back angle signal, and the second ECU 40 is connected to a collision sensor to obtain a collision signal. The first ECU 30 can be a seat ECU, and the second ECU 40 can be an airbag ECU. The force limiting deployment unit is connected to the force limiting adjustment mechanism. The pretensioning control unit is connected to the second ECU 40 and the retraction mechanism 80, respectively.

[0048] When the backrest angle signal transmitted to the first ECU 30 is less than the preset threshold of the backrest angle, the first ECU 30 does not intend to transmit a signal to the force limiting control unit 60. When a frontal collision occurs, the airbag ECU receives the signal, processes it, and transmits it to the force limiting control unit 60 and the pretensioning control unit 50 respectively. Since the force limiting control unit 60 only receives the collision signal transmitted by the second ECU 40 and does not simultaneously receive the switching signal transmitted by the first ECU 30, the force limiting control unit 60 is not activated, the generator does not work, the force limiting adjustment mechanism 70 does not switch the force limiting bar, and the second force limiting bar is used for operation. After the pretensioning control unit 50 receives the collision signal from the second ECU 40, the pretensioner is activated and the pretensioning work is completed. When the seat belt retraction mechanism 80 finishes the pretensioning work and reaches the force limiting value of the second force limiting bar, it begins to limit the force under the action of the force limiting bar to reduce the injury of the webbing to the human chest and abdomen.

[0049] When the backrest angle signal transmitted to the first ECU 30 is greater than the preset threshold of the backrest angle, the first ECU 30 transmits a switching signal to the force limiting control unit 60. However, the transmission of a single signal cannot activate it to perform the ignition operation. Only when the second ECU 40 receives the collision signal and transmits the signal to the force limiting control unit 60 again, will the force limiting control unit 60 be activated and work. Then, the force limiting adjustment mechanism 70 will switch the force limiting lever. After switching the force limiting lever, the first force limiting lever and the second force limiting lever will be coaxial and limit the force together. At this time, the pretensioning control unit 50 will also complete the pretensioning work simultaneously. After the pretensioning is completed, the seat belt retraction mechanism 80 will lock. As long as the force limiting value reaches the force limiting value set by the first force limiting lever, the force limiting work will begin. After the force limiting work is completed, the second force limiting lever will not work, thus completing the force limiting work in the zero-gravity posture and improving the protection effect of the occupants in the zero-gravity posture.

[0050] In some embodiments, please refer to Figure 5The seat belt force limiting system further includes a pretensioning control unit 50, which is used to drive the seat belt 90 to pretension when a collision signal from the collision sensor 20 is acquired. The force limiting control unit 60 is connected to the pretensioning control unit 50. When the seat back angle sensor 10 detects a signal that the seat back angle is greater than or equal to a preset threshold and the collision signal from the collision sensor 20 is acquired, the force limiting control unit 60 controls the pretensioning control unit 50 to drive the seat belt 90 to pretension and drives the force limiting component 101 to switch to the first force limiting state. This solution reuses the seatbelt pretensioning control unit 50. When a collision occurs when the seat back angle is less than a preset threshold, the pretensioning control unit 50 only receives the collision signal from the second ECU 40. The pretensioning control unit 50 drives the retraction mechanism 80 to retract the seatbelt for pretensioning. After reaching the force limit value of the second force limiter, it begins to limit the force under the action of the second force limiter, reducing the injury of the webbing to the chest and abdomen of the human body. When a collision occurs when the seat back angle is greater than or equal to the preset threshold, the pretensioning control unit 50 simultaneously receives the collision signal from the second ECU 40 and the switching signal from the force limiter control unit 60. The pretensioning control unit 50 not only drives the retraction mechanism 80 to retract the seatbelt for pretensioning, but also drives the force limiter adjustment mechanism 70 to switch to the operation of the first force limiter 1011. When the force limit value of the first force limiter 1011 is reached, it begins to limit the force to complete the force limit operation in zero gravity posture, thereby improving the protection effect of the occupant in zero gravity posture. For example, the pretension control unit 50 includes a pretension detonator, a first air passage, and a second air passage. The first air passage is connected to the retraction mechanism, and the second air passage is connected to the force limiting adjustment mechanism 70. The force limiting control unit 60 controls the opening and closing of the second air passage. When a collision occurs when the seat back angle is less than a preset threshold, the detonator detonates, and the impact gas drives the retraction mechanism to retract the seat belt through the first air passage. The second air passage closes, and the force limiting component 101 remains in the second force limiting state. When a collision occurs when the seat back angle is greater than or equal to the preset threshold, the force limiting control unit 60 controls the second air passage to open, the detonator detonates, and the impact gas drives the retraction mechanism to retract the seat belt through the first air passage. The force limiting adjustment mechanism 70 is then switched to the first force limiting state via the second air passage.

[0051] In some embodiments, the force limiting range of the first force limiting bar 1011 is 3KN-3.5KN. This force limiting range can improve the safety of occupant protection in lying positions such as zero gravity, and avoid injury to occupants caused by seat belts that are too loose or have excessive tension.

[0052] In some embodiments, the force limiting range of the second force limiting bar 1012 is 4KN-4.5KN. This force limiting range improves occupant safety under normal posture conditions, preventing injury to the occupant caused by an overly loose seatbelt or excessive tension.

[0053] This application proposes a seat assembly including the aforementioned seatbelt force limiting system. This seat assembly has the same beneficial effects as the aforementioned seatbelt force limiting system. The aforementioned seatbelt force limiting system is connected to the seat body and can better adapt to the safety protection requirements of zero-gravity seats.

[0054] This application proposes a vehicle assembly including a seatbelt force limiting system as described above or a seat assembly as described above. The vehicle has the same beneficial effects as the aforementioned seatbelt force limiting system or seat assembly.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A seatbelt force limiting system, characterized in that, include: A retraction mechanism (80) for retracting the seat belt (90); A force limiting component (101), connected to the retraction mechanism (80), is used to limit the tension of the seat belt (90); The force limiting component (101) has a first force limiting state and a second force limiting state. When the seat back angle is greater than or equal to a preset threshold, the force limiting component (101) is in the first force limiting state. When the seat back angle is less than a preset threshold, the force limiting component (101) is in the second force limiting state, and the force limiting value of the first force limiting state is less than the force limiting value of the second force limiting state.

2. The seatbelt force limiting system according to claim 1, characterized in that, The force limiting component (101) includes a first force limiting rod (1011) and a second force limiting rod (1012), wherein the force limiting value of the first force limiting rod (1011) is less than that of the second force limiting rod (1012); when the force limiting component (101) is in the first force limiting state, the force limiting component (101) limits the tension of the seat belt (90) through the first force limiting rod (1011); when the force limiting component (101) is in the second force limiting state, the force limiting component (101) limits the tension of the seat belt (90) through the second force limiting rod (1012).

3. The seatbelt force limiting system according to claim 2, characterized in that, The winding mechanism (80) includes a locking frame (801) and a winding drum (802). The winding drum (802) is rotatably connected to the locking frame (801). A first force limiting rod (1011) and a second force limiting rod (1012) are connected to a connecting part (1013). One end of the second force limiting rod (1012) away from the connecting part (1013) is connected to the locking frame (801), and one end of the first force limiting rod (1011) away from the connecting part (1013) is connected to the winding drum (802). When the connecting part (1013) is connected to the winding drum (802), the force limiting component (101) is in the second force limiting state. When the connecting part (1013) is disengaged from the winding drum (802), the force limiting component (101) is in the first force limiting state.

4. The seatbelt force limiting system according to claim 3, characterized in that, The force limiting assembly (101) further includes a force limiting adjustment mechanism (70), which is used to connect or disconnect the connecting part (1013) and the winding drum (802).

5. The seatbelt force limiting system according to any one of claims 1-4, characterized in that, The seat belt force limiting system also includes a force limiting control unit (60), which is connected to the force limiting component (101). The force limiting control unit (60) includes a first input port and a second input port. The first input port is used to acquire the angle signal of the seat back, and the second input port is used to acquire the collision signal. When the force limiting control unit (60) acquires a signal that the seat back angle is greater than or equal to a preset threshold and a collision signal, the force limiting control unit (60) controls the force limiting component (101) to switch to the first force limiting state; otherwise, the force limiting component (101) is in the second force limiting state.

6. The seatbelt force limiting system according to claim 5, characterized in that, The force limiting control unit (60) further includes a force limiting detonation unit. When the force limiting control unit (60) obtains a signal that the seat back angle is greater than or equal to a preset threshold and a collision signal from the collision sensor (20), the force limiting detonation unit drives the force limiting component (101) to switch to the first force limiting state.

7. The seatbelt force limiting system according to claim 5, characterized in that, The seat belt force limiting system also includes a pretensioning control unit (50), which is used to drive the seat belt (90) to pretension when a collision signal from the collision sensor (20) is acquired. The force limiting control unit (60) is connected to the pretensioning control unit (50). When a signal is acquired from the seat back angle sensor (10) that the seat back angle is greater than or equal to a preset threshold and a collision signal from the collision sensor (20) is acquired, the force limiting control unit (60) controls the pretensioning control unit (50) to drive the seat belt (90) to pretension and drive the force limiting component (101) to switch to the first force limiting state.

8. The seatbelt force limiting system according to claim 2, characterized in that, The first force limiting bar (1011) has a force limiting range of 3KN-3.5KN, and / or the second force limiting bar (1012) has a force limiting range of 4KN-4.5KN.

9. A seat assembly, characterized in that, Includes the seatbelt force limiting system as described in any one of claims 1-8.

10. A vehicle assembly, characterized in that, Includes the seat belt force limiting system as described in any one of claims 1-8 or the seat assembly as described in claim 9.

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