Safety belt system with adjustable pre-tightening force, vehicle with safety belt system and control method

Abstract

The embodiment of the invention provides a pre-tightening force adjustable safety belt system, a vehicle with the same and a control method, and relates to the technical field of automobile safety. The safety belt system with the adjustable pre-tightening force comprises a belt body; the pre-tightening device is connected with the belt body, and the pre-tightening device has a pre-tightening state for tightening the belt body and a releasing state for releasing the belt body; the sensor assembly is connected with at least one of a vehicle seat and an engine, and the sensor assembly is used for collecting angle information of the vehicle seat, weight information of a passenger and distance information of the belt body and the passenger; the control unit is electrically connected with the pre-tightener and the sensor assembly, the control unit is used for controlling the pre-tightener to be in a pre-tightening state and a releasing state according to data information collected by the sensor assembly, and the data information comprises at least one of angle information, weight information and distance information. The technical problem that the pre-tightening force of the safety belt cannot be adjusted in real time according to physical signs of passengers is solved.

Description

Technical Field

[0001] This application relates to the field of automotive safety technology, and more specifically, to a pretension-adjustable seat belt system, a vehicle having the same, and a control method thereof. Background Technology

[0002] To eliminate the gap between occupants and seat belts and reduce the forward momentum, pre-tensioned seat belts are generally used in vehicles. A pre-tensioned seat belt is a safety device that automatically tightens within 0.1 seconds of a collision. Its core components include a control device and a pretensioning device, and it is usually used in conjunction with airbags.

[0003] Existing technology has the following drawbacks: the preload is fixed and cannot be adjusted in real time according to the occupant's body shape, sitting posture and collision intensity, which can easily lead to rib compression or insufficient restraint.

[0004] There is currently no good solution to the above problems. Summary of the Invention

[0005] This application provides a seat belt system with adjustable pretension force, a vehicle having the same, and a control method, to at least solve the technical problem in the prior art that the seat belt pretension force cannot be adjusted in real time according to the occupant's physical condition.

[0006] According to one aspect of the embodiments of this application, a seat belt system with adjustable pretension force is provided, comprising: a belt body; a pretensioner connected to the belt body, the pretensioner having a pretensioned state of tightening the belt body and a released state of releasing the belt body; a sensor assembly connected to at least one of a vehicle seat and an engine, the sensor assembly being used to collect angle information of the vehicle seat, weight information of the occupant, and distance information between the belt body and the occupant; and a control unit electrically connected to the pretensioner and the sensor assembly, the control unit being used to control the pretensioner to be in the pretensioned state and the released state according to the data information collected by the sensor assembly, wherein the data information includes at least one of angle information, weight information, and distance information.

[0007] Furthermore, the surface of the band is coated with a fluorescent layer.

[0008] Further, the pretensioner includes: a take-up shaft, one end of the belt being wound circumferentially around the take-up shaft, the take-up shaft having a first rotational direction for tightening the belt and a second rotational direction for releasing the belt; a drive motor electrically connected to a control unit, the output end of the drive motor being connected to the take-up shaft, the drive motor being used to drive the take-up shaft to rotate, thereby tightening or releasing the belt; wherein the first rotational direction is opposite to the second rotational direction, the take-up shaft tightens the belt by rotating along one of the first or second rotational directions, and the take-up shaft releases the belt by rotating along the other of the first or second rotational directions.

[0009] Furthermore, the sensor assembly includes multiple pressure sensors, multiple distance sensors, and multiple speed sensors. At least one pressure sensor is provided at least one of the bottom and backrest of the vehicle seat, at least one distance sensor is provided at least one of the backrest and side of the vehicle seat, and at least one speed sensor is provided at the output shaft of the engine. The pressure sensors are used to detect the pressure borne by the vehicle seat, the distance sensors are used to detect the tilt angle of the vehicle seat and the distance between the seat and the occupant, and the speed sensors are used to detect the speed of the vehicle.

[0010] Furthermore, the pretensioner also includes a locking member connected to the take-up shaft. The locking member has a limiting position that abuts against the take-up shaft to restrict its rotation, and a clearance position that avoids the take-up shaft. The locking member is used to restrict the rotation of the pretensioner.

[0011] Furthermore, the seat belt system also includes a lower end piece, through which the belt body is connected to the vehicle body. The lower end piece is provided with a communication interface for connecting to the control unit.

[0012] According to another aspect of the embodiments of this application, a vehicle is also provided, the vehicle having a pretension-adjustable seat belt system, the pretension-adjustable seat belt system being the aforementioned pretension-adjustable seat belt system.

[0013] According to another aspect of the embodiments of this application, a control method for a pretension-adjustable seat belt system is also provided. The method is used to control the aforementioned pretension-adjustable seat belt system. The method includes: acquiring the posture information of a target object and the driving information of a target vehicle. The posture information of the target object includes at least the pressure information exerted by the target object on the seat of the target vehicle, the tilt angle information of the seat, and the distance information between the chest of the target object and the belt body. The driving information includes at least the speed information and acceleration information of the target vehicle. Based on the posture information and the driving information, an optimal pretension is determined. Based on the optimal pretension, a control instruction set is generated. The control instruction set is used to control the pretensioner to be in a pretensioned state and a released state.

[0014] Optionally, a control instruction set is generated based on the optimal preload. The method includes: when it is determined that the difference between the optimal preload and the current preload meets a preset threshold, a tightening control instruction is generated in the control instruction set. The tightening control instruction is used to control the preload to switch to the preload state.

[0015] Optionally, based on the optimal preload, a control command set is generated. The method further includes: when it is confirmed that the acceleration information meets the preset conditions, generating a rewind reset command in the control command set, the rewind reset command being used to control the preload to be in the released state.

[0016] In this embodiment, information about the vehicle seat is collected by a sensor assembly, including the seat's angle, pressure, and real-time vehicle speed. The control unit analyzes and processes the data collected by the sensor assembly, controlling the pretensioner to switch between pretensioning and release states to wind or release the belt. This intelligently and dynamically adjusts the pretension force of the belt on the occupant, ensuring the optimal pretension force between the belt and the occupant, thus preventing the belt from compressing the occupant or providing insufficient restraint. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of an optional adjustable pretension seat belt system according to an embodiment of this application;

[0019] Figure 2 This is a flowchart of a control method for an optional pretension-adjustable seat belt system according to an embodiment of this application.

[0020] The above figures include the following reference numerals:

[0021] 10. Belt body; 20. Pretensioner; 30. Lower end plate. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] According to an embodiment of this application, a seat belt system with adjustable pretension force is provided.

[0025] Specifically, such as Figure 1 As shown, the adjustable pretension seat belt system includes a belt body 10, a pretensioner 20, a sensor assembly, and a control unit. The pretensioner 20 is connected to the belt body 10 and has a pre-tensioned state that tightens the belt body 10, and a released state that releases the belt body 10. The sensor assembly is connected to at least one of the vehicle seat and the engine, and is used to collect angle information of the vehicle seat, weight information of the occupant, and distance information between the belt body 10 and the occupant. The control unit is electrically connected to the pretensioner 20 and the sensor assembly, and is used to control the pretensioner 20 to be in the pre-tensioned state and the released state according to the data information collected by the sensor assembly, wherein the data information includes at least one of angle information, weight information, and distance information.

[0026] By applying the technical solution of this embodiment, information on the vehicle seat is collected through sensor components, including the angle of the vehicle seat, the pressure it bears, and real-time speed information of the vehicle. The control unit analyzes and processes the data collected by the sensor components, and controls the pretensioner 20 to switch to different states of pretensioning or release to wind up or release the belt 10. This intelligently and dynamically adjusts the pretension force of the belt 10 on the occupant, so as to adjust the pretension force between the belt 10 and the occupant to the optimal state, and avoids the belt 10 from compressing the occupant or providing insufficient restraint force.

[0027] It should be noted that, in this embodiment, the control unit can quickly control the pretensioner 20 to switch the pretension state according to the real-time data information collected by the sensor components. For example, when the vehicle is in the event of emergency braking or collision, the real-time vehicle speed can be determined according to the engine output speed and other information collected in real time by the sensor components, so that the pretensioner 20 can be quickly activated when the vehicle is in a collision. The pretensioner 20 can switch to the pretension state within 0.1 seconds and wind up the belt 10 to provide sufficient pretension force to ensure the safety of the occupants.

[0028] Specifically, the surface of the belt 10 is coated with a fluorescent layer. By coating the surface of the belt 10 with a fluorescent layer, high visibility is ensured at night or in low-light environments. The fluorescent layer absorbs ambient light and emits light in the dark, allowing external personnel to quickly identify whether occupants are wearing seat belts, improving safety when driving at night, especially during emergency rescues, where rescuers can quickly assess the restraint status of occupants inside the vehicle.

[0029] In one exemplary embodiment of this application, a fluorescent layer with a width ≥ 20 mm is disposed along the entire length of the outer surface of the strip 10, wherein the fluorescent layer is a phosphorescent SrAl2O4:Eu². + Dy³ + The material, namely rare-earth fluorescent material, has an afterglow brightness ≥150mcd / m 2 (10 min), nighttime visibility ≥ 50 m.

[0030] Further, the pretensioner 20 includes a take-up shaft and a drive motor. One end of the belt 10 is wound circumferentially around the take-up shaft. The take-up shaft has a first rotational direction for tightening the belt 10 and a second rotational direction for releasing the belt 10. The drive motor is electrically connected to the control unit, and its output end is connected to the take-up shaft. The drive motor is used to drive the take-up shaft to rotate, thereby tightening or releasing the belt 10. The first rotational direction is opposite to the second rotational direction. The take-up shaft tightens the belt 10 by rotating along one of the first or second rotational directions, and releases the belt 10 by rotating along the other of the first or second rotational directions. The take-up shaft is used to wind and release the belt 10. The output end of the drive motor is connected to the take-up shaft, and the control unit controls the drive motor to rotate, thereby driving the take-up shaft to rotate along the first or second rotational direction, thus winding or releasing the belt 10.

[0031] In this embodiment, the pretensioner 20 operates as follows: When the control unit receives a signal requiring seatbelt tightening (e.g., a collision warning), it instructs the drive motor to rotate in a first rotation direction. This direction allows the retractor to wind more of the seatbelt 10, thereby tightening the seatbelt, reducing the gap between the occupant and the seat, and improving collision safety. When the seatbelt does not need to be pre-tensioned (e.g., after a minor collision), the control unit causes the drive motor to rotate in a second rotation direction opposite to the first rotation direction. The retractor releases the seatbelt 10, allowing the seatbelt to return to its normal state, ensuring passenger comfort while reducing unnecessary maintenance costs. By using a bidirectional (reversible) pretensioner 20, it can be reused, reducing maintenance and replacement costs.

[0032] Furthermore, the sensor assembly includes multiple pressure sensors, multiple distance sensors, and multiple speed sensors. At least one pressure sensor is installed in at least one of the bottom and backrest of the vehicle seat, at least one distance sensor is installed in at least one of the backrest and side of the vehicle seat, and at least one speed sensor is installed at the output shaft of the engine. The pressure sensors are used to detect the pressure borne by the vehicle seat, the distance sensors are used to detect the tilt angle of the vehicle seat and the distance between the belt 10 and the occupant, and the speed sensors are used to detect the vehicle speed. Installing pressure sensors in the bottom and backrest of the vehicle seat to detect the pressure borne by the vehicle seat can determine the occupant's weight and sitting posture, facilitating the control unit to calculate an appropriate pretension force. At the same time, the distance sensor on the vehicle seat can detect the distance between the belt 10 and the occupant's body, facilitating the adjustment of the length and position of the belt 10. The speed sensor installed in the engine and other power transmission systems can detect information such as vehicle speed and acceleration in real time, facilitating the judgment of vehicle operating conditions and enabling the intelligent seat belt system to respond faster and pretension more accurately.

[0033] In one embodiment of this application, information collected by all sensors is transmitted to the control unit in real time via the CAN-FD communication protocol. The control unit fuses and calculates this information according to an algorithm. Based on the occupant status (weight, sitting posture, and distance between the chest and the seat belt) and vehicle status (speed, acceleration) calculated by the algorithm, the control unit can determine whether the seat belt needs to be pretensioned and the magnitude of the pretensioning force.

[0034] Furthermore, the pretensioner 20 also includes a locking element connected to the reel. The locking element has a limiting position that abuts against the reel to restrict its rotation, and a yielding position that avoids the reel. The locking element is used to limit the rotation of the pretensioner 20. When the locking element is in the limiting position, the contact point between the locking element and the reel is in tight contact, locking the rotation of the reel mechanically or electromagnetically. Even if the motor stops working or the system loses power, the reel can remain in its current position, preventing the seat belt from accidentally coming loose and ensuring that the seat belt's protective effect on the occupant is not weakened during a collision or emergency braking. When the locking element is in the yielding position, it leaves the contact with the reel, allowing the reel to rotate freely. This state typically occurs when the seatbelt needs to be released to maintain occupant comfort, such as during normal driving or when the seatbelt needs to be reset after a minor collision. By designing the avoidance position of the locking element, the pretensioner 20 can quickly and smoothly release the seatbelt without applying pretension force, improving occupant comfort and the system's operational flexibility.

[0035] In this embodiment, the safety of the intelligent seat belt system is enhanced by incorporating a locking mechanism, ensuring that the seat belt tightens promptly in any emergency to effectively protect the occupants. Simultaneously, the locking mechanism's avoidance position design improves the system's comfort and user experience during daily driving, reducing unnecessary pretensioning and allowing occupants to enjoy a more free and comfortable driving environment even in non-emergency situations.

[0036] Furthermore, the seatbelt system also includes a lower end piece 30. The belt body 10 is connected to the vehicle body via the lower end piece 30. The lower end piece 30 is equipped with a communication interface for connecting to the control unit. The lower end piece 30 securely connects one end of the seatbelt body 10 to the vehicle structure using mechanical fastening methods, such as bolts or buckles, ensuring that the seatbelt can stably restrain the occupant in the event of a collision or emergency, preventing it from loosening due to external forces. The communication interface uses a vehicle industry-standard communication protocol, such as CAN-FD, to achieve high-speed data transmission between various electronic modules within the vehicle. Through the communication interface, the control unit can obtain real-time status information of the seatbelt system, such as the tension of the belt body 10, the occupant's seating posture, and weight.

[0037] According to another specific embodiment of this application, a vehicle is provided, which has a pretension-adjustable seat belt system, the pretension-adjustable seat belt system being the same as the one described in the above embodiment. Integrating the intelligent seat belt system into the vehicle seat enables linkage with the vehicle's collision warning system. The vehicle communicates with the seat belt system via a CAN-FD bus to monitor occupant status and collision warning information in real time, significantly improving the vehicle's passive safety and reducing occupant injuries in a collision.

[0038] According to another specific embodiment of this application, such as Figure 2 As shown, a control method for a pretension-adjustable seat belt system is also provided. The method is used to control the pretension-adjustable seat belt system in the above embodiments, and includes:

[0039] Step S10: Obtain the posture information of the target object and the driving information of the target vehicle. The posture information of the target object includes at least the pressure information of the target object on the seat of the target vehicle, the tilt angle information of the seat, and the distance information between the chest of the target object and the belt. The driving information includes at least the speed information and acceleration information of the target vehicle.

[0040] Specifically, posture information is obtained through pressure and distance sensors installed on the seat, which can monitor the magnitude and distribution of pressure applied to the seat by the target object in real time to determine the target object's weight and sitting posture; tilt angle information is obtained through an angle sensor to detect the tilt angle of the seat back, which can obtain the contact area and method between the target object and the seat, affecting the optimal distribution of pretension force; distance information is obtained through millimeter-wave radar or infrared distance sensors to measure the distance between the target object's chest and the belt body.

[0041] In step S10, the control unit processes the information collected by the sensor components using a data fusion algorithm to calculate the real-time attitude information of the target object, so that the system can provide personalized seat belt pretension adjustment.

[0042] Step S20: Determine the optimal preload based on attitude state information and driving information;

[0043] Specifically, the control unit processes the above information using its built-in algorithm and calculates the optimal preload.

[0044] Step S30: Based on the optimal preload, generate a control command set. The control command set is used to control the preload to be in the preloaded state and the released state.

[0045] Specifically, once the optimal pretension force is calculated, it can be compared with the current pretension force to determine whether the current state of the target object requires adjustment of the belt. In turn, the pretensioner can be controlled to be in a pretensioned or released state to adjust the winding and releasing of the belt, so that the belt is suitable for the current state of the target object, effectively reducing the injury of the occupant in a collision and improving the protective effect of the seat belt.

[0046] Through the above steps, the posture information of the target object and the driving information of the target vehicle are obtained. The posture information of the target object includes at least the pressure information exerted by the target object on the seat of the target vehicle, the seat tilt angle information, and the distance information between the target object's chest and the seat belt. The driving information includes at least the vehicle speed and acceleration information. Based on the posture and driving information, the optimal pretension force is determined. Based on the optimal pretension force, a control command set is generated, which is used to control the pretensioner in the pretensioned and released states. Sensor data is processed through real-time algorithms to achieve dynamic adjustment of the pretension force. The control unit calculates the optimal pretension force based on the occupant status and vehicle driving conditions, and adjusts the working state of the pretensioner through the control command set to reduce occupant injury in a collision and improve the protective effect of the seat belt.

[0047] Optionally, a control command set is generated based on the optimal preload, the method including:

[0048] Step S21: If the difference between the optimal preload and the current preload meets the preset threshold, generate a tightening control command in the control command set. The tightening control command is used to control the preload to switch to the preload state.

[0049] Specifically, the preset threshold is a pre-set value. The control unit first calculates the optimal pretension force based on the occupant posture information and vehicle driving information in real time, and compares it with the current pretension force. If the condition of the preset threshold is met, it proves that the current pretension force is significantly different from the optimal pretension force, and the tightening belt needs to be adjusted to adjust the current pretension force toward the optimal pretension force.

[0050] Optionally, a control command set is generated based on the optimal preload, the method including:

[0051] Step S22: If the acceleration information is confirmed to meet the preset conditions, a rewind reset command is generated in the control command set. The rewind reset command is used to control the pretensioner to be in the released state.

[0052] Specifically, the acceleration sensor continuously monitors the vehicle's acceleration changes, especially after a collision event is detected. It can quickly capture the acceleration peak and subsequent recovery. When the acceleration information shows that the collision impact suffered by the vehicle is less than the preset minor collision threshold, the system determines that the pretensioner 20 can safely switch from the pretensioned state to the released state and begins to generate the rewind reset command.

[0053] This application also provides a preferred embodiment of a pretension-adjustable seat belt system and its control method, which is a reusable, real-time adaptive, and nighttime-time-sensitive intelligent seat belt system.

[0054] Specifically, the adjustable pretension seat belt system includes a belt body 10, and the outer surface of the belt body 10 is provided with a fluorescent layer with a width ≥20mm along its entire length, wherein the fluorescent layer is a phosphorescent SrAl2O4:Eu² + Dy³ + The material, namely rare-earth fluorescent material, has an afterglow brightness ≥150mcd / m 2 (10min); The pretensioner 20 is driven by a brushless motor to rotate the take-up shaft bidirectionally, with a maximum output torque of 8N*m and a response time ≤50ms. It adjusts the pretension force through a real-time algorithm, reducing occupant chest injury by 25%-40% (based on C-NCAP sled test). The sensor assembly includes a pressure sensor, an angle sensor, and a millimeter-wave radar distance sensor for real-time detection of the distance between the occupant's chest and the seatbelt 10. The control unit communicates with the vehicle collision warning system and calculates the optimal pretension force F(m, θ, d, v) in real-time based on the sensor assembly data, where m is body weight, θ is the seat back angle, d is the distance between the seatbelt and the chest, and v is the relative collision velocity. The locking mechanism automatically locks the take-up shaft when the system loses power. The brushless motor drives the take-up shaft to rotate bidirectionally to perform the pretensioning function. It works with the pressure sensor, angle sensor, and millimeter-wave radar distance sensor to identify the occupant's seating position. When a collision is imminent, the sensors provide a signal, and the reversible electric pretensioner 20 engages to pre-tighten the seatbelt, protecting the occupant's safety.

[0055] The workflow of a pretension-adjustable seatbelt system is as follows:

[0056] Step 1: Initialization, power-on self-test, read calibration parameters k1-k4, ΔF threshold;

[0057] It should be noted that parameters k1-k4 and the ΔF threshold are all preset thresholds, determined according to the specifications of the seat belt system.

[0058] Step two: The sensor assembly collects data in real time on the occupant's weight, seat back angle, vehicle speed, and distance between the occupant and the belt.

[0059] Step 3: Determine if V≥5km / h and if the seat belt is fastened. If not fastened, output an abnormal status with "buzzer + indicator light alarm".

[0060] In abnormal conditions, the locking component is in the restricted position, the system is powered off, and the take-up shaft automatically locks the take-up belt 10.

[0061] Step 4, calculate the optimal preload: F=k1•m+k2•θ+k3•(1 / d)+k4•v (result limit: 50N ≤F≤800N);

[0062] The result limit indicates the effective pretension force range of the seat belt system; exceeding the limit range indicates an abnormal state.

[0063] Step 5: Determine if |F–F_prev|>ΔF. If the threshold adjustment is satisfied, start the drive motor.

[0064] In this embodiment, the control of the adjustable pretension seat belt system also has a rewind reset function, which can automatically rewind reset after a minor vehicle collision (<0.3g acceleration impact) to avoid the seat belt misjudging the vehicle's operating condition.

[0065] As can be seen from the above description, the adjustable pretension seat belt system in the above embodiments has the following beneficial effects:

[0066] 1) When a vehicle is about to collide, the sensor assembly calculates the occupant's weight, posture, and the distance between their chest and the webbing by detecting the occupant's weight, posture, and the distance between their chest and the webbing. The reversible electric pretensioner intervenes in advance to tighten the webbing, thereby protecting the occupant.

[0067] 2) Compared to the widely used gunpowder-type pretensioners, the reversible electric pretensioner is reusable, does not require complete replacement after triggering, and is precise and controllable.

[0068] 3) The distance between the occupant's chest cavity and the belt is detected in real time by millimeter-wave radar (accuracy ±2cm), and the pretension force can be dynamically adjusted to avoid excessive compression, which is especially suitable for pregnant women and children.

[0069] 4) Maintenance costs are reduced by 90% compared to traditional gunpowder-type pretensioners.

[0070] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0072] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pre-tension adjustable seat belt system, characterized by, The safety belt system comprises: a belt body (10); a pretensioner (20) connected with the belt body (10), the pretensioner (20) having a pretension state for tightening the belt body (10), and the pretensioner (20) having a release state for releasing the belt body (10); a sensor assembly connected with at least one of a vehicle seat and an engine, the sensor assembly being used to collect angle information of the vehicle seat, weight information of an occupant, and distance information between the belt body (10) and the occupant; a control unit electrically connected with the pretensioner (20) and the sensor assembly, the control unit being used to control the pretensioner (20) to be in the pretension state or the release state according to data information collected by the sensor assembly, wherein the data information comprises at least one of the angle information, the weight information, and the distance information.

2. The pretensioner-adjustable seatbelt system of claim 1, wherein The belt body (10) is coated with a fluorescent layer.

3. The pretensioner-adjustable seatbelt system of claim 2, wherein The pretensioner (20) comprises: a winding shaft, one end of the belt body (10) being wound on the winding shaft along a circumference of the winding shaft, the winding shaft having a first rotation direction for tightening the belt body (10), and the winding shaft having a second rotation direction for releasing the belt body (10); a drive motor electrically connected with the control unit, an output end of the drive motor being connected with the winding shaft, the drive motor being used to drive the winding shaft to rotate so as to tighten or release the belt body (10); wherein the first rotation direction is opposite to the second rotation direction, the winding shaft is rotated in one of the first rotation direction or the second rotation direction to tighten the belt body (10), and the winding shaft is rotated in the other of the first rotation direction or the second rotation direction to release the belt body (10).

4. The pretension force adjustable seat belt system according to any one of claims 1 to 3, characterized in that The sensor assembly comprises a plurality of pressure sensors, a plurality of distance sensors, and a plurality of speed sensors, at least one of a bottom and a backrest of the vehicle seat being provided with at least one of the pressure sensors, at least one of a backrest and a side of the vehicle seat being provided with at least one of the distance sensors, and an output shaft of the engine being provided with at least one of the speed sensors, the pressure sensors being used to detect pressure borne by the vehicle seat, the distance sensors being used to detect an inclination angle of the vehicle seat and a distance between the belt body (10) and the occupant, and the speed sensors being used to detect a speed of the vehicle.

5. The pretensioner-adjustable seatbelt system of claim 3, wherein The pretensioner (20) further comprises a locking member connected with the winding shaft, the locking member having a limiting position abutting against the winding shaft to limit rotation of the winding shaft, and the locking member having an avoiding position avoiding the winding shaft, the locking member being used to limit rotation of the pretensioner (20).

6. The pretensioner-adjustable seatbelt system of claim 5, wherein The safety belt system further comprises a lower end piece (30), the belt body (10) being connected with a vehicle body through the lower end piece (30), and a communication interface being arranged on the lower end piece (30) and used to be connected with the control unit.

7. A vehicle characterized by comprising: The vehicle has a pre-tightening adjustable seat belt system, and the pre-tightening adjustable seat belt system is the pre-tightening adjustable seat belt system in any one of claims 1-6.

8. A control method of a pretension force adjustable seat belt system, characterized by, The method is used for controlling the pre-tightening adjustable seat belt system in any one of claims 1-6, and the method comprises: Obtaining posture information of a target object and driving information of a target vehicle, wherein the posture information of the target object at least includes pressure information applied by the target object on a seat of the target vehicle, inclination angle information of the seat, and distance information between a chest of the target object and a belt body, and the driving information at least includes vehicle speed information and acceleration information of the target vehicle; Determining an optimal pre-tightening force based on the posture information and the driving information; Generating a control instruction set based on the optimal pre-tightening force, and the control instruction set is used for controlling the pre-tightener to be in the pre-tightening state and the release state.

9. The method of claim 8, wherein, Generating a control instruction set based on the optimal pre-tightening force, and the method comprises: In a case where a difference between the optimal pre-tightening force and a current pre-tightening force satisfies a preset threshold, generating a tightening control instruction in the control instruction set, and the tightening control instruction is used for controlling the pre-tightener to switch to the pre-tightening state.

10. The method of claim 8, wherein, Generating a control instruction set based on the optimal pre-tightening force, and the method further comprises: In a case where the acceleration information satisfies a preset condition, generating a roll-back reset instruction in the control instruction set, and the roll-back reset instruction is used for controlling the pre-tightener to be in the release state.

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