WO2023016457A1 - Seat belt system capable of determining level of chest injury and vehicle - Google Patents

Seat belt system capable of determining level of chest injury and vehicle Download PDF

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Publication number
WO2023016457A1
WO2023016457A1 PCT/CN2022/111172 CN2022111172W WO2023016457A1 WO 2023016457 A1 WO2023016457 A1 WO 2023016457A1 CN 2022111172 W CN2022111172 W CN 2022111172W WO 2023016457 A1 WO2023016457 A1 WO 2023016457A1
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WO
WIPO (PCT)
Prior art keywords
seat belt
pressure sensor
vehicle
belt system
injury
Prior art date
Application number
PCT/CN2022/111172
Other languages
French (fr)
Inventor
Mingjun Yang
Zhongka YANG
Original Assignee
Daimler Ag
Daimler Greater China Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler Ag, Daimler Greater China Ltd. filed Critical Daimler Ag
Publication of WO2023016457A1 publication Critical patent/WO2023016457A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R2021/0027—Post collision measures, e.g. notifying emergency services
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R2022/006—Sleeve or tubular members enveloping the seat belt for enhancing comfort or protection

Definitions

  • the present invention relates to the field of safety technology, more particularly to a seat belt system capable of determining the level of chest injury and vehicle.
  • Safety is one of the important performances of vehicles.
  • passive safety technologies such as seat belt and airbag
  • active safety technologies such as lane departure, collision warning, and traction control.
  • the function of automatic emergency call can be triggered for remote agent inquiry after the accident, the injury can only be judged by the injured person. Limited by the medical knowledge and the unavoidable error in determining the physical condition, the people on the vehicle cannot accurately judge their own injuries, especially internal injuries, by visual observation. In addition, it is impossible to inform the remote rescuers of the injury in the case that the injured person is unconscious and unable to speak. In this condition, even the accompanying sober passengers cannot judge the injury, and moving the injured person without knowing his injury may cause irreversible damage. The above factors add to the difficulty for the remote agent to accurately know the on-site conditions. Even if the professional medical staffs are at the site, they have to spend some time in checking the injury conditions, which will delay the rescue.
  • the present invention provides a seat belt system capable of determining the level of chest injury.
  • the present invention is based on the following inventive idea: as a standard configuration on the vehicle, the seat belt is worn by the occupant when the vehicle is running, so the seat belt in the present invention is provided with a detecting device for detecting the chest compression of the seat belt wearer after the collision, so as to determine the level of chest injury.
  • the present invention proposes the following technical solution.
  • a seat belt system capable of determining a level of chest injury, comprising: a seat belt comprising a seat belt body; a pressure sensor disposed on the seat belt body; and a controller receiving data from the pressure sensor and determining the level of chest injury of a seat belt wearer based on the data received from the pressure sensor after a vehicle collision occurs.
  • the pressure sensor is a flexible film pressure sensor.
  • the seat belt body is provided with a double-layer woven structure, and the flexible film pressure sensor is encapsulated in the double-layer woven structure.
  • the controller sends the level of chest injury to an injury receiving and responding device by wired or wireless means.
  • the injury receiving and responding device includes at least one of:
  • the seat belt further comprises a lock tongue and a buckle, the lock tongue being provided with a plug that is electrically connected to the pressure sensor, and a power supply socket being provided in the vicinity of the buckle.
  • the flexible film pressure sensor includes a plurality of pressure sensing points distributed along the length direction of the seat belt.
  • the number of pressure sensing points ranges from 2 to 20.
  • the injury level of ribs of the seat belt wearer is determined by the seat belt system.
  • the data from the pressure sensor includes resistance values of the pressure sensor after the collision occurs.
  • the data from the pressure sensor also includes one or more of the change rate of the resistance value of the sensor after the collision, the vehicle speed and the vehicle acceleration at the time of the collision.
  • the injury level of the seat belt wearer is determined based on the minimum value of the resistance value of the pressure sensor within a predetermined period of time after the collision.
  • the seat belt system further comprises a memory, which stores a predetermined chest compression amount corresponding to the data of the pressure sensor after the collision.
  • the data of the pressure sensor includes the resistance values of the pressure sensor after the collision, and/or at least one of the change rate of the resistance value of the sensor after the collision, the vehicle speed and the vehicle acceleration at the time of the collision, and a corresponding relationship between the data of the pressure sensor and the chest compression amount is established through a neural network algorithm or through polynomial fitting.
  • the present invention further relates to a vehicle comprising the seat belt system according to the above solutions.
  • the injury level determined by the seat belt system is displayed on an on-board display device in a visualized form represented by graphics, text and/or color, and/or is displayed in an audio form by an on-board audio-visual device.
  • a standard/existing safety belt for a vehicle is utilized in the present invention, and a pressure detecting device is provided on the safety belt to determine the degree of chest injury of passengers after a collision, and the data on injury degree can be displayed on the dashboard of the vehicle and sent to the rescue center.
  • the driver or passengers can judge the degree of injury, and at the same time, the passers-by can help according to the display; on the other hand, the rescue center can roughly judge the injury and provide accurate rescue.
  • the present invention is particularly applicable to determine the degree of chest injury of an occupant after a frontal collision or partial offset collision or other types of vehicle collision accidents.
  • the safety belt system of the present invention can be achieved by installing corresponding elements to a vehicle that has already been delivered, or can be configured beforehand in the vehicle before the vehicle leaves the factory according to a preferred embodiment of the invention.
  • the safety belt system can be implemented at a low cost with favorable effects.
  • Fig. 1 is an application diagram of a seat belt system capable of determining the level of chest injury according to an embodiment of the present invention.
  • Fig. 2 is a schematic diagram of the seat belt of the seat belt system capable of determining the level of chest injury and the pressure sensor adopted according to an embodiment of the present invention.
  • Fig. 3 is a schematic diagram of a pressure sensor encapsulated in the seat belt body of the seat belt system capable of determining the level of chest injury according to an embodiment of the present invention.
  • Fig. 4 is a schematic diagram of a flexible film multipoint pressure sensor according to an embodiment of the present invention.
  • Fig. 5 is a schematic diagram of a configuration according to an embodiment of the present invention.
  • Fig. 6 schematically shows the information processing procedure of the seat belt system capable of determining the level of chest injury of the present invention.
  • Fig. 1 shows an application diagram of the seat belt system capable of determining the level of chest injury of the present invention.
  • the seat belt system capable of determining the level of chest injury according to the present invention mainly includes a pressure sensor and a controller provided in the seat belt.
  • the controller In addition to receiving data from the pressure sensor, the controller also receives values from other sensors on the vehicle. For example, the controller receives data from the acceleration sensor and/or the airbag controller (ACU) of the vehicle to determine whether the vehicle has suffered a collision.
  • ACU airbag controller
  • the controller determines that the vehicle has suffered a collision according to the data of the acceleration sensor and/or the airbag controller (ACU) of the vehicle, it processes the data in the pressure sensor and then determines the level of chest injury of seat belt wearers in the vehicle. Hence, the controller can also determine whether the vehicle has suffered a collision by receiving information from the ECU on the vehicle that is adopted for determining whether the vehicle has suffered a collision.
  • ACU airbag controller
  • the controller After the controller determines the level of chest injury of the occupant in the vehicle, it can send relevant information to different organizations or devices. For example, the level of chest injury of the occupant in the vehicle can be sent via CAN bus to a display device on the vehicle such as the dashboard or the central control panel for visual display.
  • the information may be displayed in the form of text, or in the form of a visual still image, or in the form of a dynamic image such as a flashing graphic, or in any combination of two or more of the above methods.
  • relevant information can also be broadcast by voice.
  • the chest injury can be divided into four levels and expressed by different colors: green indicates no injury, yellow indicates slight injury, orange indicates serious injury, and red indicates critical condition.
  • the seat belt system in the present invention can measure the injury of the rib, i.e. it can determine whether the rib is injured, e.g. whether the rib is broken and to which degree the rib is broken.
  • the occupants in the vehicle can immediately know their injuries after the collision, and take the next step on this basis. For example, if the occupant is not injured or slightly injured in the chest, he can move without exerting a force, and if he is seriously injured, he should avoid exerting a force and moving. In addition, other persons, such as passers-by in other vehicles or pedestrians, can immediately know the injury of the occupants in the vehicle to decide how to rescue the occupants and avoid further injury due to improper rescue.
  • the seat belt system capable of determining the injury level in the present invention can include a plurality of pressure sensors, which are provided in a plurality of seat belts on the vehicle.
  • the controller receives the information of each pressure sensor and displays them on the display device such as the dashboard or console/central control panel of the vehicle.
  • the level of chest injury of every occupant in the vehicle can be provided.
  • the controller can send relevant information to the on-board call center to contact the rescue center.
  • the on-board call center will contact the rescue center by means of voice communication; thereby the persons in the vehicle can report the level of chest injury displayed on the display device of the vehicle to the rescue center, so that the rescue center can make corresponding decisions.
  • the controller also sends relevant data to the rescue center. For example, in addition to the level of chest injury, the model of the vehicle, the speed and acceleration of the vehicle at the time of the collision, the position of the vehicle, etc. can also be sent to the rescue center.
  • the controller can send relevant information to devices outside the vehicle, e.g. devices outside the vehicle where relevant programs are installed. In this way, persons holding such a device can know the information related to the level of chest injury.
  • Fig. 2 is a schematic diagram of a seat belt provided with a pressure sensor of the seat belt system capable of determining the injury level of the present invention.
  • the seat belt comprises a seat belt body 11, a seat belt lock tongue 13, and a seat belt buckle 14.
  • a pressure sensor 12 is provided within the seat belt body 11. Since the pressure sensor 12 is disposed at the position corresponding to the chest of the seat belt wearer, the chest pressure can be measured accurately.
  • the pressure sensor in the present invention adopts a flexible film multipoint pressure sensor 12 and is encapsulated in the seat belt body 11.
  • the pressure sensor shall be arranged reasonably.
  • the seat belt body is a flexible structure that needs to be curled in use and cannot be too hard to hurt the passengers.
  • a flexible film pressure sensor is adopted.
  • a pressure sensor for multi-point detection is selected to evaluate the injury degree of the entire chest of the passenger comprehensively.
  • the number of pressure sensing points of the pressure sensor can be set between 2 and 20.
  • the seat belt body is designed as a double-layer structure, e.g. a double-layer woven structure, and the flexible film sensor be encapsulated in the double-layer woven seat belt body, so that the sensor can be avoided from being exposed, be protected from wear or damage in daily use, and will not affect the appearance of the seat belt body.
  • Fig. 4 shows a schematic structure of a flexible film multipoint pressure sensor.
  • the sensor is formed by printing a conductive layer on a flexible polyester substrate e.g. PET, arranging an adhesive and an insulating layer on the conductive layer, encapsulating the double layers obtained thereby in a matched manner, and connecting the conductive layer to the acquisition system via a wire.
  • Multi-point pressure measurement is enabled by providing a plurality of mutually independent sensing areas in the sensor, wherein the output resistance of the respective sensing area varies with the external pressure.
  • the sensor When no force is applied, the sensor has a large resistance value (>10m ⁇ ) .
  • the sensing area is under pressure, the circuits that were not in contact with each other will be energized due to contact, so that the resistance output value varies with the pressure. The greater the pressure is, the smaller the resistance is.
  • Fig. 5 shows a specific structure of the seat belt system capable of determining the injury level of the present invention.
  • the conductive layer of the pressure sensor is connected to the output terminal 15 disposed on the lock tongue 13 of the seat belt, and on the other hand, the power supply socket 16 is arranged on the seat belt buckle 14 connected to a fixed component, e.g. a seat, via a connection section 18. Therefore, when the seat belt is buckled, the output terminal 15 and the power supply socket 16 are also engaged at the same time, and the pressure sensor can start working. When the seat belt is untied, the sensor does not collect signals.
  • the pressure sensor can be connected to the 12V power supply on the vehicle.
  • the controller 17 may be arranged at the power supply socket.
  • the controller may have a wireless communication module, e.g. a WiFi module. Therefore, the seat belt system capable of determining the injury level in the present invention can be simply installed on the vehicle, and can be easily repaired and replaced as well. Hence, the controller in a vehicle engine system can be used alternatively, as long as the function can be fulfilled.
  • Fig. 6 schematically shows the information processing procedure of the seat belt system capable of determining the injury level in the present invention. It can be seen from Fig. 6 that when a collision accident happens in a vehicle provided with a seat belt system capable of determining the injury level of the present invention, the flexible film multi-point pressure sensor collects the pressure on the chest area of the seat belt wearer. When the pressure acts on a sensing area, the upper and lower conductive layers will be energized upon contact, and the resistance value R of the pressure sensor will change. The more the chest is squeezed, the more the energized sensing areas are, and the smaller the resistance value R is. Then, the corresponding chest compression amount S is obtained according to the measured resistance value R. Different chest compression amounts S obtained can be divided into different grades according to the evaluation rules.
  • the resistance value R of the pressure sensor during this period is a physical quantity that changes with time.
  • the present invention adopts the minimum resistance value of the pressure sensor within a predetermined time after the collision to obtain the corresponding chest compression amount.
  • the predetermined time may be 0-2s, preferably 0-0.5s, and more preferably 0-0.1s.
  • the seat belt system of the present invention is also provided with a memory in which the corresponding relationship between the preset resistance value R and the chest compression amount S is stored.
  • the corresponding relationship between different resistance values R and chest compression amounts S can be established in the manners like polynomial fitting through a large number of collision test data.
  • the controller in addition to acquiring the resistance value in the pressure sensor to determine the corresponding chest compression amount, can also acquire one or more of the vehicle speed, the vehicle acceleration, and the change rate of the resistance value of the pressure sensor at the time of the collision to determine the corresponding chest compression amount.
  • the corresponding relationship between the combinations of parameters and the chest compression amounts can also be established through a large number of tests.
  • one or more of the resistance value, the vehicle speed and acceleration at the time of collision, and the change rate of the resistance value can be used as the input layer by using the neural network algorithm, and after they are trained through the neural network algorithm, the chest injury values are output.
  • the well-trained neural network algorithm can be internalized to the controller.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Alarm Systems (AREA)

Abstract

A seat belt system capable of determining the level of chest injury. The seat belt system comprises: a seat belt comprising a seat belt body (11); a pressure sensor (12) disposed on the seat belt body (11); and a controller receiving data from the pressure sensor (12) and determining the injury level of the seat belt wearer according to the data received from the pressure sensor (12) after a vehicle collision occurs. When the vehicle collision occurs, the data of the pressure sensor (12) installed in the seat belt of the vehicle are obtained, the chest injury level is determined based on the data, and the determined chest injury level is sent to a display device in the vehicle, a rescue organization outside the vehicle, and an electronic device outside the vehicle, such that the driver or passengers can judge the degree of injury, and the passersby can also provide assistance based on the displayed information. In addition, the system helps the rescue organization to roughly determine the injury situation, so as to provide accurate rescue.

Description

Seat belt system capable of determining level of chest injury and vehicle Technical Field
The present invention relates to the field of safety technology, more particularly to a seat belt system capable of determining the level of chest injury and vehicle.
Background Art
Safety is one of the important performances of vehicles. In order to ensure the safety of vehicles, a variety of safety technologies have been developed, including passive safety technologies such as seat belt and airbag, and active safety technologies such as lane departure, collision warning, and traction control.
With the development of Internet of vehicles, a function of automatic emergency call has been developed. When a vehicle accident occurs, this function can be triggered automatically, so that the people on the vehicle can communicate with the remote customer service and report the accident.
Although the function of automatic emergency call can be triggered for remote agent inquiry after the accident, the injury can only be judged by the injured person. Limited by the medical knowledge and the unavoidable error in determining the physical condition, the people on the vehicle cannot accurately judge their own injuries, especially internal injuries, by visual observation. In addition, it is impossible to inform the remote rescuers of the injury in the case that the injured person is unconscious and unable to speak. In this condition, even the accompanying sober passengers cannot judge the injury, and moving the injured person without knowing his injury may cause irreversible damage. The above factors add to the difficulty for the remote agent to accurately know the on-site conditions. Even if the professional medical staffs are at the site, they have to spend some time in checking the injury conditions, which will delay the rescue.
Summary of the Invention
To solve the above technical problem, the present invention provides a seat belt system capable of determining the level of chest injury. The present invention is based on the following inventive idea: as a standard configuration on the vehicle, the seat belt is worn by the occupant when the vehicle is running, so the seat belt in the present invention is provided with a detecting device for detecting the chest compression of the seat belt  wearer after the collision, so as to determine the level of chest injury.
Specifically, the present invention proposes the following technical solution.
A seat belt system capable of determining a level of chest injury, comprising: a seat belt comprising a seat belt body; a pressure sensor disposed on the seat belt body; and a controller receiving data from the pressure sensor and determining the level of chest injury of a seat belt wearer based on the data received from the pressure sensor after a vehicle collision occurs.
According to one aspect of the present invention, the pressure sensor is a flexible film pressure sensor.
According to one aspect of the present invention, the seat belt body is provided with a double-layer woven structure, and the flexible film pressure sensor is encapsulated in the double-layer woven structure.
According to one aspect of the present invention, the controller sends the level of chest injury to an injury receiving and responding device by wired or wireless means.
According to one aspect of the present invention, the injury receiving and responding device includes at least one of:
- a display device in a vehicle equipped with the seat belt system;
- a rescue or medical institution communicated with the vehicle;
- an electronic device communicated with the vehicle.
According to one aspect of the present invention, the seat belt further comprises a lock tongue and a buckle, the lock tongue being provided with a plug that is electrically connected to the pressure sensor, and a power supply socket being provided in the vicinity of the buckle.
According to one aspect of the present invention, the flexible film pressure sensor includes a plurality of pressure sensing points distributed along the length direction of the seat belt.
According to one aspect of the present invention, the number of pressure sensing points ranges from 2 to 20.
According to one aspect of the present invention, the injury level of ribs of the seat belt wearer is determined by the seat belt system.
According to one aspect of the present invention, the data from the pressure sensor  includes resistance values of the pressure sensor after the collision occurs.
According to one aspect of the present invention, the data from the pressure sensor also includes one or more of the change rate of the resistance value of the sensor after the collision, the vehicle speed and the vehicle acceleration at the time of the collision.
According to one aspect of the present invention, the injury level of the seat belt wearer is determined based on the minimum value of the resistance value of the pressure sensor within a predetermined period of time after the collision.
According to one aspect of the present invention, the seat belt system further comprises a memory, which stores a predetermined chest compression amount corresponding to the data of the pressure sensor after the collision.
According to one aspect of the present invention, the data of the pressure sensor includes the resistance values of the pressure sensor after the collision, and/or at least one of the change rate of the resistance value of the sensor after the collision, the vehicle speed and the vehicle acceleration at the time of the collision, and a corresponding relationship between the data of the pressure sensor and the chest compression amount is established through a neural network algorithm or through polynomial fitting.
In addition, the present invention further relates to a vehicle comprising the seat belt system according to the above solutions.
Further, the injury level determined by the seat belt system is displayed on an on-board display device in a visualized form represented by graphics, text and/or color, and/or is displayed in an audio form by an on-board audio-visual device.
It can be seen from the above solutions that a standard/existing safety belt for a vehicle is utilized in the present invention, and a pressure detecting device is provided on the safety belt to determine the degree of chest injury of passengers after a collision, and the data on injury degree can be displayed on the dashboard of the vehicle and sent to the rescue center. On the one hand, the driver or passengers can judge the degree of injury, and at the same time, the passers-by can help according to the display; on the other hand, the rescue center can roughly judge the injury and provide accurate rescue. The present invention is particularly applicable to determine the degree of chest injury of an occupant after a frontal collision or partial offset collision or other types of vehicle collision accidents.
The safety belt system of the present invention can be achieved by installing corresponding elements to a vehicle that has already been delivered, or can be configured beforehand in the vehicle before the vehicle leaves the factory according to a preferred  embodiment of the invention. The safety belt system can be implemented at a low cost with favorable effects.
Other advantages, features, and details emerged from at least one embodiment described in detail below with reference to the accompanying drawings. The same, similar and /or functionally identical components are provided with the same reference signs.
Brief Description of the Drawings
Fig. 1 is an application diagram of a seat belt system capable of determining the level of chest injury according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the seat belt of the seat belt system capable of determining the level of chest injury and the pressure sensor adopted according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a pressure sensor encapsulated in the seat belt body of the seat belt system capable of determining the level of chest injury according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a flexible film multipoint pressure sensor according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a configuration according to an embodiment of the present invention.
Fig. 6 schematically shows the information processing procedure of the seat belt system capable of determining the level of chest injury of the present invention.
The accompanying drawings are only schematic and are not necessarily drawn to scale. In addition, they show only the parts necessary to illustrate the invention, and other parts may be omitted or only mentioned simply. That is, the present invention may include other components in addition to those shown in the drawings.
Detailed Description of the Embodiments
The technical solution of the present invention is described in detail below with reference to the accompanying drawings.
Taking a vehicle as an example, Fig. 1 shows an application diagram of the seat belt system capable of determining the level of chest injury of the present invention. The seat belt system capable of determining the level of chest injury according to the present invention mainly includes a pressure sensor and a controller provided in the seat belt. In  addition to receiving data from the pressure sensor, the controller also receives values from other sensors on the vehicle. For example, the controller receives data from the acceleration sensor and/or the airbag controller (ACU) of the vehicle to determine whether the vehicle has suffered a collision. When the controller determines that the vehicle has suffered a collision according to the data of the acceleration sensor and/or the airbag controller (ACU) of the vehicle, it processes the data in the pressure sensor and then determines the level of chest injury of seat belt wearers in the vehicle. Apparently, the controller can also determine whether the vehicle has suffered a collision by receiving information from the ECU on the vehicle that is adopted for determining whether the vehicle has suffered a collision.
After the controller determines the level of chest injury of the occupant in the vehicle, it can send relevant information to different organizations or devices. For example, the level of chest injury of the occupant in the vehicle can be sent via CAN bus to a display device on the vehicle such as the dashboard or the central control panel for visual display. The information may be displayed in the form of text, or in the form of a visual still image, or in the form of a dynamic image such as a flashing graphic, or in any combination of two or more of the above methods. Apparently, relevant information can also be broadcast by voice.
As a specific embodiment, the chest injury can be divided into four levels and expressed by different colors: green indicates no injury, yellow indicates slight injury, orange indicates serious injury, and red indicates critical condition.
Preferably, the seat belt system in the present invention can measure the injury of the rib, i.e. it can determine whether the rib is injured, e.g. whether the rib is broken and to which degree the rib is broken.
Thereby the occupants in the vehicle can immediately know their injuries after the collision, and take the next step on this basis. For example, if the occupant is not injured or slightly injured in the chest, he can move without exerting a force, and if he is seriously injured, he should avoid exerting a force and moving. In addition, other persons, such as passers-by in other vehicles or pedestrians, can immediately know the injury of the occupants in the vehicle to decide how to rescue the occupants and avoid further injury due to improper rescue.
Apparently, the seat belt system capable of determining the injury level in the present invention can include a plurality of pressure sensors, which are provided in a plurality of seat belts on the vehicle. The controller receives the information of each pressure sensor  and displays them on the display device such as the dashboard or console/central control panel of the vehicle. Thus, the level of chest injury of every occupant in the vehicle can be provided.
In addition, the controller can send relevant information to the on-board call center to contact the rescue center. Generally speaking, in case of an accident, the on-board call center will contact the rescue center by means of voice communication; thereby the persons in the vehicle can report the level of chest injury displayed on the display device of the vehicle to the rescue center, so that the rescue center can make corresponding decisions. Preferably, in addition to voice communication, the controller also sends relevant data to the rescue center. For example, in addition to the level of chest injury, the model of the vehicle, the speed and acceleration of the vehicle at the time of the collision, the position of the vehicle, etc. can also be sent to the rescue center.
In addition, the controller can send relevant information to devices outside the vehicle, e.g. devices outside the vehicle where relevant programs are installed. In this way, persons holding such a device can know the information related to the level of chest injury.
Fig. 2 is a schematic diagram of a seat belt provided with a pressure sensor of the seat belt system capable of determining the injury level of the present invention. As shown in the figure, the seat belt comprises a seat belt body 11, a seat belt lock tongue 13, and a seat belt buckle 14. A pressure sensor 12 is provided within the seat belt body 11. Since the pressure sensor 12 is disposed at the position corresponding to the chest of the seat belt wearer, the chest pressure can be measured accurately.
Further, referring to Fig. 3, the pressure sensor in the present invention adopts a flexible film multipoint pressure sensor 12 and is encapsulated in the seat belt body 11. In order to accurately measure the chest pressure of the occupants in the vehicle, the pressure sensor shall be arranged reasonably. Considering that the seat belt body is a flexible structure that needs to be curled in use and cannot be too hard to hurt the passengers, a flexible film pressure sensor is adopted. In addition, because the chest area is a relatively large area and there is more than one stress point, a pressure sensor for multi-point detection is selected to evaluate the injury degree of the entire chest of the passenger comprehensively. For example, the number of pressure sensing points of the pressure sensor can be set between 2 and 20.
The present invention also provides that the seat belt body is designed as a double-layer structure, e.g. a double-layer woven structure, and the flexible film sensor be encapsulated in the double-layer woven seat belt body, so that the sensor can be avoided from being  exposed, be protected from wear or damage in daily use, and will not affect the appearance of the seat belt body.
Fig. 4 shows a schematic structure of a flexible film multipoint pressure sensor. The sensor is formed by printing a conductive layer on a flexible polyester substrate e.g. PET, arranging an adhesive and an insulating layer on the conductive layer, encapsulating the double layers obtained thereby in a matched manner, and connecting the conductive layer to the acquisition system via a wire.
Multi-point pressure measurement is enabled by providing a plurality of mutually independent sensing areas in the sensor, wherein the output resistance of the respective sensing area varies with the external pressure. When no force is applied, the sensor has a large resistance value (>10m Ω) . When the sensing area is under pressure, the circuits that were not in contact with each other will be energized due to contact, so that the resistance output value varies with the pressure. The greater the pressure is, the smaller the resistance is.
Fig. 5 shows a specific structure of the seat belt system capable of determining the injury level of the present invention. As can be seen from Fig. 5, on the one hand, the conductive layer of the pressure sensor is connected to the output terminal 15 disposed on the lock tongue 13 of the seat belt, and on the other hand, the power supply socket 16 is arranged on the seat belt buckle 14 connected to a fixed component, e.g. a seat, via a connection section 18. Therefore, when the seat belt is buckled, the output terminal 15 and the power supply socket 16 are also engaged at the same time, and the pressure sensor can start working. When the seat belt is untied, the sensor does not collect signals. Only when the seat belt is tied, the sensor starts to work and the controller converts and transmits the signal collected by the pressure sensor, thereby avoiding the sensor being in working state all the time and thus saving resources. The pressure sensor can be connected to the 12V power supply on the vehicle. The controller 17 may be arranged at the power supply socket. In addition, the controller may have a wireless communication module, e.g. a WiFi module. Therefore, the seat belt system capable of determining the injury level in the present invention can be simply installed on the vehicle, and can be easily repaired and replaced as well. Apparently, the controller in a vehicle engine system can be used alternatively, as long as the function can be fulfilled.
Fig. 6 schematically shows the information processing procedure of the seat belt system capable of determining the injury level in the present invention. It can be seen from Fig. 6 that when a collision accident happens in a vehicle provided with a seat belt system capable of determining the injury level of the present invention, the flexible film multi-point  pressure sensor collects the pressure on the chest area of the seat belt wearer. When the pressure acts on a sensing area, the upper and lower conductive layers will be energized upon contact, and the resistance value R of the pressure sensor will change. The more the chest is squeezed, the more the energized sensing areas are, and the smaller the resistance value R is. Then, the corresponding chest compression amount S is obtained according to the measured resistance value R. Different chest compression amounts S obtained can be divided into different grades according to the evaluation rules.
Since the restraint of the seat belt to the passenger is a dynamic process after the collision, the resistance value R of the pressure sensor during this period is a physical quantity that changes with time. As a preferred embodiment, the present invention adopts the minimum resistance value of the pressure sensor within a predetermined time after the collision to obtain the corresponding chest compression amount. The predetermined time may be 0-2s, preferably 0-0.5s, and more preferably 0-0.1s.
Specifically, the seat belt system of the present invention is also provided with a memory in which the corresponding relationship between the preset resistance value R and the chest compression amount S is stored. The corresponding relationship between different resistance values R and chest compression amounts S can be established in the manners like polynomial fitting through a large number of collision test data.
As a preferred embodiment of the present invention, in addition to acquiring the resistance value in the pressure sensor to determine the corresponding chest compression amount, the controller can also acquire one or more of the vehicle speed, the vehicle acceleration, and the change rate of the resistance value of the pressure sensor at the time of the collision to determine the corresponding chest compression amount.
Accordingly, when multiple parameters are used to determine the chest compression amounts, the corresponding relationship between the combinations of parameters and the chest compression amounts can also be established through a large number of tests. For example, one or more of the resistance value, the vehicle speed and acceleration at the time of collision, and the change rate of the resistance value can be used as the input layer by using the neural network algorithm, and after they are trained through the neural network algorithm, the chest injury values are output. The well-trained neural network algorithm can be internalized to the controller.
The present invention has been clearly and completely described with reference to the schematic embodiments. It should be understood by those skilled in the art that various other embodiments can be envisaged by modifying the disclosed technical solution without  departing from the spirit and scope of the present invention. These embodiments should be understood as falling within the scope determined by the present invention based on the claims and any equivalent technical solution thereof.

Claims (16)

  1. A seat belt system capable of determining a level of chest injury, comprising:
    a seat belt comprising a seat belt body;
    a pressure sensor disposed on the seat belt body; and
    a controller receiving data from the pressure sensor and determining an injury level of a seat belt wearer based on the data received from the pressure sensor after a vehicle collision occurs.
  2. The seat belt system according to claim 1, characterized in that
    the pressure sensor is a flexible film pressure sensor.
  3. The seat belt system according to claim 2, characterized in that
    the seat belt body is provided with a double-layer woven structure, and the flexible film pressure sensor is encapsulated in the double-layer woven structure.
  4. The seat belt system according to any of claims 1-3, characterized in that
    the controller sends the injury level to an injury receiving and responding device by wired or wireless means.
  5. The seat belt system according to claim 4, characterized in that
    the injury receiving and responding device includes at least one of
    a display device in a vehicle equipped with the seat belt system;
    a rescue or medical institution communicated with the vehicle;
    an electronic device communicated with the vehicle.
  6. The seat belt system according to any of claims 1-3, characterized in that
    the seat belt further comprises a lock tongue and a buckle, the lock tongue being provided with a plug that is electrically connected to the pressure sensor, and a power supply socket being provided in the vicinity of the buckle.
  7. The seat belt system according to claim 2 or 3, characterized in that
    the flexible film pressure sensor includes a plurality of pressure sensing points distributed along the length direction of the seat belt.
  8. The seat belt system according to claim 7, characterized in that
    the number of pressure sensing points ranges from 2 to 20.
  9. The seat belt system according to any of claims 1-3, characterized in that
    the injury level of ribs of the seat belt wearer is determined by the seat belt system.
  10. The seat belt system according to any of claims 1-3, characterized in that
    the data from the pressure sensor includes resistance values of the pressure sensor after the collision occurs.
  11. The seat belt system according to claim 10, characterized in that
    the data from the pressure sensor also includes one or more of the change rate of the resistance value of the sensor after the collision, the vehicle speed and the vehicle acceleration at the time of the collision.
  12. The seat belt system according to claim 10, characterized in that
    the injury level of the seat belt wearer is determined based on the minimum value of the resistance value of the pressure sensor within a predetermined period of time after the collision.
  13. The seat belt system according to any of claims 1-3, characterized by
    a memory, which stores a predetermined chest compression amount corresponding to the data of the pressure sensor after the collision.
  14. The seat belt system according to claim 13, characterized in that
    the data of the pressure sensor includes the resistance values of the pressure sensor after the collision, and/or at least one of the change rate of the resistance value of the sensor after the collision, the vehicle speed and the vehicle acceleration at the time of the collision, and a corresponding relationship between the data of the pressure sensor and the chest compression amount is established through a neural network algorithm or through polynomial fitting.
  15. A vehicle comprising the seat belt system according to any of claims 1-14.
  16. The vehicle according to claim 15, characterized in that
    the injury level determined by the seat belt system is displayed on an on-board display device in a visualized form represented by graphics, text and/or color, and/or is displayed in an audio form by an on-board audio-visual device.
PCT/CN2022/111172 2021-08-13 2022-08-09 Seat belt system capable of determining level of chest injury and vehicle WO2023016457A1 (en)

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