A method for arranging a passenger side overhead airbag

Abstract

The present invention provides a method for arranging a front-mounted airbag on the passenger side. The front-mounted airbag is arranged above the ceiling on the passenger side, and the symmetry of the ceilings on the driver side and the passenger side of the vehicle is ensured. The method comprises the following steps: determining the Y coordinate of the top-mounted airbag according to the position of the passenger side seat; determining the limit position of the sun visor in the X-Z two-dimensional section according to the defined position of the dummy on the passenger side, under the premise of ensuring the human-machine field of view and head space; forming a dimension chain according to the limit size relationship between the sun visor, the ceiling, the top-mounted airbag, the front crossbeam of the roof, and the exterior top cover, and performing coordinated adjustment of the two-dimensional section in the computer design software to find the state in which the exterior top cover is lifted to the minimum, and determining the arrangement position of the top-mounted airbag in the X-direction and the Z-direction accordingly. The method reduces the difficulty of the instrument panel structure design and provides more room for the instrument panel modeling design.

Description

Technical Field

[0001] The invention relates to the technical field of automobile passive safety, and in particular to a method for arranging a front passenger side overhead airbag. Background Art

[0002] At present, the mainstream solution for the front passenger side airbag is to place it in the dashboard in front of the front passenger. When a dangerous situation occurs, the airbag pops out from the upper surface of the dashboard to protect the front passenger's head from serious injury. However, the overall structure of the dashboard and the structure of the airbag area are very complex, making development difficult, and the location of the airbag in the dashboard will greatly limit the design of the dashboard.

[0003] In view of the above problems, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the invention

[0004] In order to reduce the difficulty of instrument panel structure design to a certain extent and provide more possibilities for styling design, the present invention provides a method for arranging a passenger side overhead airbag.

[0005] The technical solution adopted by the present invention is:

[0006] A method for arranging a passenger driver's side roof airbag is provided. The roof airbag is arranged above the passenger driver's side ceiling and ensures that the driver's side and the passenger driver's side ceilings of the vehicle are symmetrical. The method comprises the following steps:

[0007] S1, determining the Y coordinate of the overhead airbag according to the position of the passenger side seat;

[0008] S2. According to the defined position of the dummy on the front passenger side, determine the limit position of the sun visor in the XZ two-dimensional section while ensuring the vision and head space of the human and the machine;

[0009] S3. According to the limit size relationship between the sun visor, ceiling, overhead airbag, front roof beam and exterior top cover, a dimension chain is formed, and coordinated adjustment of the two-dimensional cross section is performed in the computer design software to find the state where the exterior top cover is lifted to the minimum, and the layout position of the overhead airbag in the X and Z directions is determined accordingly.

[0010] Furthermore, in step S2, the dummy is a 5% female dummy.

[0011] Further, in step S2, according to the defined position of the dummy on the front passenger side, under the premise of ensuring the vision and head space of the human and the machine, the limit position of the sun visor in the XZ two-dimensional section is determined, which specifically includes:

[0012] When the sun visor is folded, the minimum Z-direction distance between the front edge of the sun visor and the driver's HM1 point is 795mm; during use, a usage distance of at least 5mm is maintained between the sun visor and the dummy's head, and the lower edge of the sun visor should be within the recommended range for the human-machine interface when opened vertically; when the sun visor is opened to the maximum angle, it does not block the human-machine field of vision.

[0013] Furthermore, in step S3, the limit size relationship between the sun visor, the ceiling, the roof airbag, the front crossbeam of the roof, and the exterior top cover is determined according to:

[0014] It is determined by the distance requirements between the sun visor and the ceiling, the minimum thickness of the ceiling, the distance requirements between the ceiling and the roof airbag, the fixed relationship between the roof airbag and the front crossbeam of the roof, and the crossbeam cavity size requirements.

[0015] Furthermore, the arrangement method also includes step S4: adding a bracket on the side of the roof airbag, and connecting the rotating shaft of the sun visor to the front cross beam of the roof through the bracket.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The method for arranging the passenger side roof airbag of the present invention arranges the safety airbag in the passenger side ceiling, which not only takes into account the deterioration of the wind resistance coefficient caused by increasing the roof height, but also ensures the passenger's field of vision and head space. At the same time, the present invention designs the scheme based on the symmetry of the driver side and the passenger side ceiling. It reduces the difficulty of instrument panel structure design and provides more room for instrument panel shape design. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 An XZ cross-sectional view of the arrangement of the overhead airbag on the passenger side of the present invention is shown;

[0020] Figure 2 Shows Figure 1 An enlarged view of the roof airbag and sun visor. DETAILED DESCRIPTION

[0021] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0022] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] The overhead airbag used in the method for arranging the overhead airbag on the passenger side of the present invention is installed on the front crossbeam of the roof sheet metal and arranged above the inner ceiling. The overhead airbag includes an airbag assembly, which includes a gas generator and an inflatable bag. The gas generator is an energy generating component that generates gas to fill the airbag, causing the inflatable bag to expand and unfold. The overhead airbag includes a U-shaped shell, which is a supporting and fixing component of the airbag assembly and is installed on the front crossbeam of the roof sheet metal on the passenger side of the vehicle. An opening is formed on one side close to the front windshield to allow the inflatable bag to expand and unfold toward the front windshield. When the airbag is detonated, it opens from the connection position between the inner ceiling and the front windshield, and the front windshield serves as a path guide. The airbag of the airbag unfolds from top to bottom and from front to back, and is supported on the dashboard until it unfolds to a protective position.

[0024] like Figure 1 , Figure 2 As shown, the passenger side airbag arrangement method of the present invention is as follows: the passenger side airbag 4 is arranged in the passenger side ceiling 3, not only the deterioration effect of increasing the roof height on the drag coefficient should be considered, but also the passenger's field of vision and head space should be guaranteed. At the same time, the design should be based on the symmetry of the driver side and passenger side ceiling heights.

[0025] According to the requirements for the use of the airbag, first determine the Y coordinate of the overhead airbag 4 according to the position of the passenger side seat. Secondly, determine the X and Z coordinates of the passenger side airbag (overhead airbag) according to the defined position of the passenger side dummy 1. The addition of the overhead airbag 4 will inevitably lead to an increase in the height of the car roof, which will have a certain impact on the exterior shape of the car body, the wind resistance coefficient, etc. Therefore, in order to minimize the adverse effects and reduce the height of the car, it is necessary to compress the distance between the roof and the head of the passenger dummy to the greatest extent. The parts involved are, from the outside of the car to the inside of the car, the exterior roof, the front crossbeam 5, the interior molding ceiling 3, and the sun visor 2.

[0026] Therefore, the method for arranging the overhead airbag on the front passenger side is as follows: the overhead airbag is arranged above the ceiling on the front passenger side, and the ceilings on the driver's side and the front passenger side of the vehicle are ensured to be symmetrical.

[0027] Determine the Y coordinate of the overhead airbag according to the position of the passenger side seat;

[0028] According to the defined position of the passenger side dummy 1, under the premise of ensuring the vision and head space of the human and the machine, determine the limit position of the sun visor in the XZ two-dimensional section;

[0029] According to the limit size relationship between the sun visor 2, the ceiling 3, the overhead airbag 4, the front roof beam 5 and the exterior top cover, a dimension chain is formed, and the two-dimensional cross-section is coordinated and adjusted in the computer design software to find the state where the exterior top cover is lifted minimally, and the layout position of the overhead airbag in the X and Z directions is determined accordingly.

[0030] In order to ensure the driver's experience and driving safety, some human-machine requirements must be met. Since the height of the driver's side and the co-driver's side ceilings must be symmetrical, the dummy needs to use a more stringent driver's side dummy - a 5% female dummy, which has more stringent requirements on the human-machine field of view and head space.

[0031] In order to ensure the driving experience of the passengers, the front edge of the sun visor in the folded state cannot be too low, and the Z-direction distance 10 between the front edge and the driver's HM1 point should be at least 795mm, otherwise it will cause a serious sense of oppression. The HM1 point is the hip point of the 95th percentile male human model, which is used to control the vehicle's entry and exit characteristics and eye point position. In order to ensure the use experience of the passengers, the sun visor 2 must be kept at least 5mm away from the head of the dummy 1 during use, and the lower edge of the sun visor 2 should be within the recommended range of the human-machine when opened vertically, avoiding blocking the field of vision while shading. In order not to affect driving safety, the sun visor cannot block the human-machine field of vision line 9 when it is opened to the maximum angle.

[0032] Therefore, the vision and head space of the human and the machine must be guaranteed. Based on this, the limit position of the sun visor is first determined according to the position of the dummy in the XZ two-dimensional section. Then, the limit size relationship between each part is determined according to the distance requirements between the sun visor and the ceiling, the minimum thickness of the ceiling, the distance requirements between the ceiling and the top airbag, the fixed relationship between the top airbag and the crossbeam, and the size requirements of the crossbeam cavity to form a dimension chain, and coordinated adjustment is performed in the two-dimensional section through CATIA to find the state where the roof is lifted the least, such as Figure 2 As shown, 7 is the outline of the original exterior top cover without the top airbag 4 installed, 8 is the outline of the recommended position of the exterior top cover after it is lifted in the present passenger side airbag arrangement method, and 9 is the shape of the exterior top cover after coordination. This is the arrangement position of the top airbag in the X and Z directions.

[0033] Considering the feasibility of the three-dimensional structure, the sun visor 2 can no longer be fixed on the crossbeam due to the lowered Z-direction position. Therefore, the sun visor rotation axis is extended in the Y direction to exceed the Y-direction dimension of the top-mounted airbag, and an additional trapezoidal bracket is added to indirectly fix the sun visor. That is, a trapezoidal bracket is added on the side of the top-mounted airbag, and the sun visor rotation axis is connected to the front crossbeam of the roof through the bracket.

[0034] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. The structures and connection modes of the components in the present invention can be changed, and any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A method for arranging a passenger side overhead airbag, characterized in that: The top airbag is arranged above the ceiling on the passenger side, and the ceilings on the driver side and the passenger side of the vehicle are ensured to be symmetrical; the horizontal length direction of the vehicle body is the X direction, the vertical height direction of the vehicle body is the Z direction, and the horizontal width direction of the vehicle body is the Y direction; the method comprises the following steps: S1, determining the Y coordinate of the overhead airbag according to the position of the passenger side seat; S2. According to the defined position of the dummy on the front passenger side, determine the limit position of the sun visor in the XZ two-dimensional section while ensuring the vision and head space of the human and the machine; S3. According to the limit size relationship between the sun visor, ceiling, overhead airbag, front roof beam and exterior top cover, a dimension chain is formed, and coordinated adjustment of the two-dimensional cross section is performed in the computer design software to find the state where the exterior top cover is lifted to the minimum, and the layout position of the overhead airbag in the X and Z directions is determined accordingly.

2. A method for arranging a passenger side overhead airbag as claimed in claim 1, characterized in that: In step S2, the dummy is a 5% female dummy.

3. The method for arranging a passenger side overhead airbag according to claim 1, characterized in that: In step S2, according to the defined position of the dummy on the front passenger side, the limit position of the sun visor in the XZ two-dimensional section is determined under the premise of ensuring the human-machine field of view and head space, which specifically includes: When the sun visor is folded, the minimum Z-direction distance between the front edge of the sun visor and the driver's HM1 point is 795mm; during use, a usage distance of at least 5mm is maintained between the sun visor and the dummy's head, and the lower edge of the sun visor should be within the recommended range for the human-machine interface when opened vertically; when the sun visor is opened to the maximum angle, it does not block the human-machine field of vision.

4. A method for arranging a passenger side overhead airbag as claimed in claim 1, characterized in that: In step S3, the limit size relationship between the sun visor, the ceiling, the roof airbag, the front crossbeam of the roof, and the exterior top cover is determined according to: It is determined by the distance requirements between the sun visor and the ceiling, the minimum thickness of the ceiling, the distance requirements between the ceiling and the roof airbag, the fixed relationship between the roof airbag and the front crossbeam of the roof, and the crossbeam cavity size requirements.

5. The method for arranging a passenger side overhead airbag according to claim 1, characterized in that: The method further comprises step S4: adding a bracket on the side of the overhead airbag, and connecting the rotating shaft of the sun visor to the front cross beam of the roof through the bracket.

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