Vehicle rear protection air bag system

Abstract

The invention relates to the technical field of vehicle passive safety, in particular to a vehicle rear protection air bag system, which comprises the following steps of: acquiring solid geometric information of a seat, a door plate, a seat middle headrest vacancy and a ceiling through structured light coding, image acquisition, structured light decoding, system calibration and three-dimensional coordinate calculation; a three-dimensional Bezier curve is constructed according to solid geometry information to serve as the installation position and shape of the air bag module, and the position of a control point of the three-dimensional Bezier curve serves as the installation position of the guide module, so that the inflation module, the guide module, the air bag module and the drawstring module are installed. The air bag system is flexibly arranged according to the shapes of the seat and the automobile body, and the flexibility and practicability of the air bag system are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle passive safety, and in particular to a vehicle rear protection airbag system. Background Art

[0002] In the current field of vehicle passive safety, the safety of vehicle front and side collisions is the focus of attention. Therefore, among passive safety companies, airbag-related companies will focus on the development of airbags for frontal and side collisions in accordance with national standards and industry standards, and rear collision safety mainly relies on safety seats.

[0004] In response to the above situation, existing patents have proposed solutions: for example, invention patent 200410011890.2 discloses an airbag that is deployed along the rear window glass of a vehicle and has a guide and pulling device; invention patent 03132700.1 discloses a passenger protection device that can at least partially cover the side wall (side window) and the rear wall (rear window) after inflation; invention patent 200710301830.8 discloses a rear collision airbag device including an inflator and an airbag accommodated in a accommodating portion formed by a vehicle roof and having a special-shaped cross-sectional shape; invention patent 202110265927.8 discloses a vehicle rear window collision airbag having an air guide structure that can limit the flow direction of gas entering the airbag and having an elastic deformation support portion that absorbs vibration and avoids collision noise; utility model patent 201420155168.5 discloses a vehicle rear window safety airbag whose top is fixedly connected to the rear window crossbeam of the rear window of the vehicle and whose two sides are slidably connected to two guide rails.

[0005] These patents have made useful attempts in this regard and can provide a certain degree of protection for rear passengers. However, the solutions provided by these invention patents or utility model patents are similar to installing existing side airbags on the rear window ceiling, which are mainly suitable for MPV models with relatively ample top space. The above patents have some or all of the following limitations: First, the position of the airbag is very unfriendly to the sedan where the head space in the rear row is already very tight; secondly, since the space in the rear row is much larger than that on the side, the airbag lacks effective support in the initial stage of deployment and will float away from the occupants, greatly reducing the protective effect; thirdly, the inflated airbag is flat as a whole. Affected by the seat headrest, the airbag and the occupant's head cannot form effective contact during the entire collision process, especially in the middle position of the back row, which makes the airbag lose its due protective effect; fourthly, in the automatic driving state, the driver and passengers in the reversed front seats have not yet received corresponding protection.

[0006] In view of this, we propose a vehicle rear protection airbag system to solve the existing problems. Summary of the invention

[0007] The object of the present invention is to provide a vehicle rear protection airbag system to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: A vehicle rear protection airbag system, applied to a seat and a vehicle body, the rear airbag system includes an inflation module, a guide module, an airbag module, a drawstring module, a projection module, a collection module, and a calculation module, and the working steps include:

[0009] S1: The projection module projects the coded and modulated sequence structured light image onto the seat, door panel, the empty space between the seat headrest, and the ceiling;

[0010] S2: The acquisition module takes structured light images of the seat, door panel, the empty space between the headrests of the seat, and the ceiling surface; the acquisition module uses a binocular camera to take pictures, and the binocular camera is calibrated before taking pictures;

[0011] S3: The computing module decodes and computes the image captured by S2 and obtains the three-dimensional geometric information of the seat, door panel, the vacant space between the seat headrests, and the ceiling;

[0012] S4: The calculation module constructs a three-dimensional Bezier curve as the installation position and shape of the airbag module according to the three-dimensional geometric information;

[0013] S5: Using the control point position of the three-dimensional Bezier curve obtained in S4 as the installation position of the guide module;

[0014] S6: Install the inflation module, the guide module, the airbag module, and the drawstring module according to the installation position and shape of the airbag module and the installation position of the guide module.

[0015] Furthermore, the inflation module includes a gas generator, an installation guide portion, and an air guide portion; the guide module includes a guide hole portion, a guide installation support leg, and a guide accommodating guide portion; the airbag module is formed by sewing or bonding two or more sheets; the drawstring module includes a webbing portion and a locking portion.

[0016] Furthermore, the installation guide part connects the gas generator, the air guide part and the airbag module together and fixes them to the seat back or the vehicle body, and the air guide part is installed between the gas generator and the airbag module.

[0017] Furthermore, the airbag module is folded and placed inside the guide receiving guide portion, and the provided cable tie passes through the guide hole portion to bind the guide module and the airbag module together.

[0018] Furthermore, the airbag module includes a sheet A and a sheet B, the sheet A and the sheet B are of different lengths, the longer sheet A is provided with a Z-shaped fold at a position where the airbag module needs to expand, and the sheet A is equal to the length of the sheet B after the Z-shaped folding process.

[0019] Furthermore, one end of the webbing portion is connected to the airbag module, and the other end is connected to the buckle portion; the buckle portion is fixed to the seat or the vehicle body.

[0020] Furthermore, the installation guide portion includes an installation guide hole portion, an installation guide accommodating guide portion, and an installation guide installation support foot.

[0021] Furthermore, the gas generator is a cylindrical generator or a pancake-shaped generator; the air guide portion has more than two opening portions and an installation and fixing portion; the number of the guide hole portions is more than two; the shape of the guide hole portion is square or circular; the number of the guide mounting legs is more than two; the guide mounting legs pass through the ear portions of the airbag module and are fixed to the seat back or the body; the guide accommodating guide portion is U-shaped; the locking portion has at least two hole portions and one hook portion; the hole portion of the locking portion is square or circular.

[0022] Furthermore, the number of the installation guide holes is more than two; the shape of the installation guide holes is square or circular; the number of the installation guide mounting feet is more than two; the installation guide mounting feet pass through the hanging ears of the airbag module and are fixedly installed on the seat back or the body.

[0023] Furthermore, an air inlet is provided at the junction of the airbag module and the inflation module, and the number is one; a hanging ear portion is provided at the junction of the airbag module and the inflation module, and the number is more than two; a hanging ear portion is provided at the junction of the airbag module and the guide module, and the number is more than two.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention obtains the three-dimensional geometric information of seats, door panels, the vacant space between the seat headrests and the ceiling through structured light coding, image acquisition, structured light decoding, system calibration and three-dimensional coordinate calculation, and constructs a three-dimensional Bezier curve as the installation position and shape of the airbag module according to the three-dimensional geometric information. The control point position of the three-dimensional Bezier curve is used as the installation position of the guide module, so as to install the inflation module, the guide module, the airbag module and the drawstring module, and flexibly arrange the airbag system according to the shape of the seat and the vehicle body, thereby enhancing the flexibility and practicality of the airbag system.

[0026] 2. The rear airbag of the present invention is arranged at the seat or the vehicle body, which provides ample space for arrangement and does not occupy head space, which is more conducive to the optimized design of the vehicle appearance.

[0027] 3. The present invention has its own supporting guide structure and pull strap, which makes the deployment of the airbag more stable and reliable, and the layout is not limited by the position relationship between the seat, ceiling and rear window.

[0028] 4. After the airbag of the present invention is deployed, it can be guided into the space on the side, top and middle of the seat, thereby increasing the effective contact between the airbag and the occupant's head and providing a more comprehensive protection effect.

[0029] 5. The airbag of the present invention is suitable for protecting the driver and passengers whose front seats are placed in reverse in the state of automatic driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A flowchart of the working steps of a vehicle rear protection airbag system of the present invention;

[0031] Figure 2 It is a three-dimensional schematic diagram of the effect of the rear airbag of the present invention being deployed in the cabin;

[0032] Figure 3 A side schematic diagram of the deployment effect of the rear airbag of the present invention in the cabin;

[0033] Figure 4 is a schematic diagram of a rear airbag of the present invention in an uninstalled state;

[0034] Figure 5 A schematic diagram of the arrangement effect of the rear airbag in the seat of the present invention;

[0035] Figure 6 is a schematic diagram of a laminated cross-section of an airbag module of the present invention;

[0036] Figure 7 It is a cross-sectional schematic diagram of an inflation module of a rear airbag of the present invention;

[0037] Figure 8 It is a cross-sectional schematic diagram of a guide module of a rear air bag of the present invention;

[0038] Fig. 9 This is a schematic diagram of the rear airbag of the present invention being arranged in reverse on the front seat.

[0039] In the figure: 1. rear airbag system; 2. seat; 3. vehicle body; 4. front seat; 5. front and rear airbag system; 11. inflation module; 12. guide module; 13. airbag module; 14. drawstring module; 111. gas generator; 112. installation guide portion; 113. air guide portion; 1121. installation guide hole portion; 1122. installation guide accommodating guide portion; 1123. installation guide mounting foot; 121. guide hole portion; 122. guide mounting foot; 123. guide accommodating guide portion; 124. cable tie; 131. sheet A; 132. Z-fold; 133. sheet B; 134. sewing thread; 141. webbing portion; 142. buckle portion. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] Embodiment 1

[0042] Figure 1 A flow chart of the working steps of a vehicle rear protection airbag system is shown. A vehicle rear protection airbag system is applied to a seat 2 and a vehicle body 3. The rear airbag system 1 includes an inflation module 11, a guide module 12, an airbag module 13, a drawstring module 14, a projection module, a collection module, and a calculation module. The working steps include:

[0043] S1: The projection module projects the coded and modulated sequence structured light image onto seat 2, the door panel, the empty space in the middle headrest of seat 2, and the ceiling;

[0044] S2: The acquisition module takes structured light images of seat 2, door panel, the empty space of the middle headrest of seat 2, and the ceiling surface; wherein the acquisition module uses a binocular camera for taking pictures, and the binocular camera is calibrated before taking pictures;

[0045] S3: The computing module decodes and computes the image captured by S2 and obtains the three-dimensional geometric information of the seat 2, the door panel, the vacant space between the headrest of the seat 2, and the ceiling;

[0046] S4: The calculation module constructs a three-dimensional Bezier curve as the installation position and shape of the airbag module 13 according to the three-dimensional geometric information;

[0047] S5: Using the control point position of the three-dimensional Bezier curve obtained in S4 as the installation position of the guide module 12;

[0048] S6: Install the inflation module 11 , the guide module 12 , the airbag module 13 , and the drawstring module 14 according to the installation position and shape of the airbag module 13 and the installation position of the guide module 12 .

[0049] The mathematical model of the Nth-order three-dimensional Bezier curve is:

[0050]

[0051] Where: is the Bessel basis function; p i is the Y value corresponding to the control point of the three-dimensional Bezier curve; q i is the Z value corresponding to the control point of the three-dimensional Bezier curve; u is the X value corresponding to the three-dimensional Bezier curve; P(u) is the Y value corresponding to the three-dimensional Bezier curve; Q(u) is the Z value corresponding to the three-dimensional Bezier curve.

[0052] Figure 2 The rear airbag system 1 is shown in the deployed state in the vehicle cabin. The two ends of the rear airbag system 1 enter the gap between the seat 2 and the door panel to form side wings to protect the side of the occupant. The rear airbag system 1 bulges out at the Z-shaped fold 132 in the middle and enters the vacant headrest in the middle of the seat 2 to effectively protect the head of the occupant in the middle seat. The upper end of the rear airbag system 1 enters the gap between the seat 2 and the ceiling, especially when the vehicle rolls out of control, it effectively protects the upper part of the occupant's head. It is obvious that the rear airbag system 1 of the present invention can provide a more comprehensive protection effect compared with the prior art.

[0053] Figure 3 It is shown that after the rear airbag system 1 is deployed, it enters the gap between the headrest of the seat 2 and the ceiling under the guidance of the rear windshield or the ceiling.

[0054] Figure 4It is shown that the airbag portion of the rear airbag system 1 is folded to form a long strip shape. The rear airbag system 1 includes an inflation module 11, a guide module 12, an airbag module 13, and a drawstring module 14. The inflation module 11 includes a gas generator 111, an installation guide portion 112, and an air guide portion 113. The guide module 12 includes a guide hole portion 121, a guide installation support leg 122, and a guide accommodating guide portion 123. The airbag module 13 is formed by sewing or bonding two or more sheets. The drawstring module 14 includes a webbing portion 141 and a locking portion 142. The installation guide portion 112 includes an installation guide hole portion 1121, an installation guide accommodating guide portion 1122, and an installation guide installation support leg 1123. The gas generator 111 is a cylindrical generator or a pancake generator, the air guide portion 113 has more than two openings and mounting fixing portions, the number of the guide hole portions 121 is more than two, the shape of the guide hole portions 121 is square or circular, the number of the guide mounting legs 122 is more than two, the guide mounting legs 122 pass through the ear portions of the airbag module 13 and are fixedly mounted on the backrest of the seat 2 or the vehicle body 3, the guide accommodation guide portion 123 is U-shaped, the lock portion 142 has at least two holes and one hook portion, and the hole portion of the lock portion 142 is square or circular. One end of the webbing portion 141 is connected to the airbag module 13, and the other end is connected to the lock portion 142; the lock portion 142 is fixed to the seat 2 or the vehicle body 3. The number of the installation guide hole portions 1121 is more than two, the shape of the installation guide hole portions 1121 is square or circular, the number of the installation guide mounting feet 1123 is more than two, and the installation guide mounting feet 1123 pass through the hanging ear portion of the airbag module 13 and are fixedly installed on the backrest of the seat 2 or the vehicle body 3.

[0055] Figure 5 The arrangement of the rear airbag system 1 in the vehicle cabin is shown. The rear airbag system 1 is arranged at the rear or side of two or more vehicle seats 2 placed side by side, and can also be arranged at the rear or side of the vehicle body 3 adjacent to the seat 2. The parts of the ends on both sides that are longer than the width of the seat 2 or the vehicle body 3 are bent at a certain angle and arranged downward or upward on the side of the seat 2 or the vehicle body 3. The number and position of the inflatable modules 11 and the guide modules 12 can be combined as needed. If the number of seats 2 is three, two preferred schemes can be set. Preferred scheme 1: The number of inflatable modules 11 is one, which is arranged at the middle seat 2 position; the number of guide modules 12 is two, which are arranged at the seats 2 on both sides. Preferred scheme 2: The number of inflatable modules 11 is two, which are arranged at the seats 2 on both sides; the number of guide modules 12 is one, which is arranged at the middle seat 2 position.

[0056] Figure 6The specific implementation method of the long section and Z-shaped fold 132 of the airbag module 13 is shown. The sewing line 134 is only one of the preferred embodiments. A bonding implementation scheme can also be used. The airbag module 13 includes a sheet A131 and a sheet B133. The lengths of the sheets A131 and B133 are different. The longer sheet A131 is provided with a Z-shaped fold 132 at the position where the airbag module 13 needs to expand. After the Z-shaped fold 132, the sheet A131 is equal to the length of the sheet B133.

[0057] Figure 7 The cross section of the inflation module 11 along the elongation direction of the airbag module 13 is shown. The installation guide 112 is made of metal material through sheet metal technology, or made of plastic material through injection molding technology. The installation guide 112 installs and connects the gas generator 111, the air guide 113, and the airbag module 13 together, and finally installs and fixes them to the backrest of the seat 2 or the vehicle body 3. The air guide 113 is made of metal material through sheet metal technology, or made of woven fabric or film material by cutting, sewing or bonding. The air guide 113 is installed between the gas generation module 111 and the airbag module 13, which can isolate high-temperature gas to prevent high-temperature gas from burning the airbag, and guide the airflow to both sides of the airbag module 13. The airbag module 13 and the inflation module 11 are provided with an air inlet, the number of which is one; the airbag module 13 and the inflation module 11 are provided with two or more hanging ears at the junction.

[0058] Figure 8 The cross section of the guide module 12 is shown. The guide module 12 is made of metal material through sheet metal technology, or made of plastic material through injection molding technology. The airbag module 13 is folded and placed inside the guide accommodating guide portion 123. The cable tie 124 passes through the guide hole portion 121 to tie the guide module 12 and the airbag module 13 together. The joint of the airbag module 13 and the guide module 12 is provided with a hanging ear portion, and the number is more than two.

[0059] Fig. 9 The figure shows the state where the front row rear airbag system 5 is deployed when the front row seat 4 is placed in reverse. The front row seat 4 of the smart cockpit of the car with autonomous driving capability can be adjusted to the reverse state according to the needs of the usage scenario. At this time, the traditional main driver's seat airbag and the co-driver's seat airbag will lose their protective effect. The arrangement and protective effect of the front row rear airbag system 5 are the same as those of the rear airbag system 1, and will not be repeated.

[0060] The above-mentioned specific embodiments are only several preferred embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. A vehicle rear protection airbag system, applied to a seat (2) and a vehicle body (3), the rear airbag system (1) comprising an inflation module (11), a guide module (12), an airbag module (13), a drawstring module (14), a projection module, a collection module, and a calculation module, characterized in that: The working steps include: S1: The projection module projects the coded and modulated sequence structured light image onto the seat (2), the door panel, the vacant space in the middle headrest of the seat (2), and the ceiling; S2: the acquisition module captures structured light images of the seat (2), the door panel, the empty space in the middle of the headrest of the seat (2), and the ceiling surface; wherein the acquisition module uses a binocular camera to capture the images, and the binocular camera is calibrated before the capture; S3: The computing module decodes and computes the image captured by S2 and obtains the three-dimensional geometric information of the seat (2), the door panel, the vacant space of the middle headrest of the seat (2), and the ceiling; S4: The calculation module constructs a three-dimensional Bezier curve as the installation position and shape of the airbag module (13) according to the three-dimensional geometric information; S5: using the control point position of the three-dimensional Bezier curve obtained in S4 as the installation position of the guide module (12); S6: Install the inflation module (11), the guide module (12), the airbag module (13), and the drawstring module (14) according to the installation position and shape of the airbag module (13) and the installation position of the guide module (12).

2. A vehicle rear protection airbag system according to claim 1, characterized in that: The inflation module (11) comprises a gas generator (111), a mounting guide portion (112), and an air guide portion (113); the guide module (12) comprises a guide hole portion (121), a guide mounting support leg (122), and a guide accommodating guide portion (123); the airbag module (13) is formed by sewing or bonding two or more sheets; and the drawstring module (14) comprises a webbing portion (141) and a locking portion (142).

3. A vehicle rear protection airbag system according to claim 2, characterized in that: The installation guide part (112) is used to install and connect the gas generator (111), the air guide part (113), and the airbag module (13) together and fix them to the backrest of the seat (2) or the vehicle body (3); the air guide part (113) is installed between the gas generator (111) and the airbag module (13).

4. A vehicle rear protection airbag system according to claim 2, characterized in that: The airbag module (13) is folded and placed inside the guide accommodating guide portion (123), and a provided tie (124) passes through the guide hole portion (121) to bind the guide module (12) and the airbag module (13) together.

5. The vehicle rear protection airbag system according to claim 2, characterized in that: The airbag module (13) comprises a sheet A (131) and a sheet B (133), wherein the sheet A (131) and the sheet B (133) are of different lengths, and the longer sheet A (131) is provided with a Z-shaped fold (132) at a position where the airbag module (13) needs to expand, and after the Z-shaped fold (132) is processed, the sheet A (131) is equal in length to the sheet B (133).

6. A vehicle rear protection airbag system according to claim 2, characterized in that: One end of the webbing portion (141) is connected to the airbag module (13), and the other end is connected to the buckle portion (142); the buckle portion (142) is fixed to the seat (2) or the vehicle body (3).

7. A vehicle rear protection airbag system according to claim 2, characterized in that: The installation guide portion (112) comprises an installation guide hole portion (1121), an installation guide receiving guide portion (1122), and an installation guide installation support foot (1123).

8. The vehicle rear protection airbag system according to claim 2, characterized in that: The gas generator (111) is a cylindrical generator or a pancake generator; the air guide portion (113) has more than two opening portions and a mounting fixing portion; the number of the guide hole portions (121) is more than two; the shape of the guide hole portion (121) is square or circular; the number of the guide mounting legs (122) is more than two; the guide mounting legs (122) pass through the ear portion of the airbag module (13) and are fixedly mounted on the backrest of the seat (2) or the vehicle body (3); the guide accommodating guide portion (123) is U-shaped; the locking portion (142) has at least two hole portions and one hook portion; the hole portion of the locking portion (142) is square or circular.

9. The vehicle rear protection airbag system according to claim 7, characterized in that: The number of the installation guide hole portions (1121) is more than two; the shape of the installation guide hole portions (1121) is square or circular; the number of the installation guide mounting legs (1123) is more than two; the installation guide mounting legs (1123) pass through the hanging ears of the airbag module (13) and are fixedly mounted on the backrest of the seat (2) or the vehicle body (3).

10. The vehicle rear protection airbag system according to claim 2, characterized in that: The joint of the airbag module (13) and the inflation module (11) is provided with an air inlet, the number of which is one; the joint of the airbag module (13) and the inflation module (11) is provided with a hanging ear, the number of which is more than two; the joint of the airbag module (13) and the guide module (12) is provided with a hanging ear, the number of which is more than two.

Images