Method, device and equipment for obtaining head restraint of rear seat of vehicle

Abstract

The application discloses a kind of head restraint surface acquisition methods of vehicle rear seat, according to the design backrest angle of target vehicle rear seat and head Z direction design value, obtain head Z direction restriction surface;According to the design backrest angle, obtain the first head movement curve tangent to first dummy model;According to the maximum backrest angle of the rear seat, obtain the second head movement curve tangent to second dummy model;According to the minimum backrest angle of the rear seat, obtain the third head movement curve tangent to third dummy model;According to the first head movement curve, the second head movement curve and the third head movement curve, obtain the target head restraint surface of the target vehicle.The head restraint surface acquisition method, device and equipment of vehicle rear seat disclosed in the application can reduce the probability of passenger head hitting the ceiling under the condition that the backrest angle of the seat in the car is adjustable, and improve the safety performance of the car head space.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and in particular to a method, apparatus, and electronic device for obtaining the head restraint surface of a vehicle's rear seat. Background Technology

[0002] As ergonomics has become a major factor for consumers when purchasing cars, it has been widely applied in automotive engineering. Headroom design, a key performance indicator within automotive ergonomics, has garnered increasing attention from designers and users.

[0003] In existing technologies, the headroom design typically utilizes the SAE head envelope method to restrict the roof. However, with the headroom designed in this way, passengers' heads may hit the roof when the seat back angles are adjustable. Summary of the Invention

[0004] This invention provides a method, device, and equipment for obtaining the head restraint surface of a vehicle's rear seat, which can reduce the probability of passengers' heads hitting the roof when the seat back angle is adjustable, thereby improving the safety performance of the vehicle's headroom.

[0005] A first aspect of this invention provides a method for obtaining the head restraint surface of a rear seat in a vehicle, the method comprising:

[0006] Based on the design backrest angle and Z-direction design value of the rear seats of the target vehicle, obtain the Z-direction head constraint surface;

[0007] Based on the designed backrest angle, a first head motion curve tangent to the first dummy model is obtained, wherein the first dummy model is obtained based on the designed backrest angle, the head Z-direction limiting surface, and the constraint conditions when the digital human body model is located in the rear seat;

[0008] Based on the maximum backrest angle of the rear seat, a second head motion curve tangent to the second dummy model is obtained, wherein the second dummy model is obtained based on the maximum backrest angle and the rearward rotation parameters of the digital human body model;

[0009] Based on the minimum backrest angle of the rear seat, a third head motion curve tangent to the third dummy model is obtained, wherein the third dummy model is obtained based on the minimum backrest angle and the forward rotation parameters of the digital human body model.

[0010] The target head restraint surface of the target vehicle is obtained based on the first head motion curve, the second head motion curve, and the third head motion curve.

[0011] Optionally, obtaining the head Z-direction limiting surface based on the design backrest angle and head Z-direction design value of the rear seats of the target vehicle includes:

[0012] Based on the designed backrest angle and the designed Z-direction head angle, the passenger head envelope is offset in the Z-direction to obtain the Z-direction head constraint surface.

[0013] Optionally, the step of obtaining the first dummy model includes:

[0014] Based on the designed backrest angle and the head Z-direction limiting surface, obtain the backrest angle condition corresponding to the designed backrest angle and the head limiting condition of the head Z-direction limiting surface;

[0015] The constraint conditions are obtained based on the backrest angle condition and the head restraint condition;

[0016] The parameters of the digital human body model are adjusted according to the constraints to obtain the first dummy model.

[0017] Optionally, the step of obtaining the second dummy model includes:

[0018] Based on the maximum backrest angle and the designed backrest angle, the rearward rotation angle of the digital human body model is obtained, wherein the rearward rotation parameter includes the rearward rotation angle;

[0019] In the ZX plane, the backward rotation of the digital human body model is controlled using the backward rotation parameters to obtain the second dummy model.

[0020] Optionally, the step of obtaining the third dummy model includes:

[0021] Based on the minimum backrest angle and the designed backrest angle, the forward rotation angle of the digital human body model is obtained, wherein the forward rotation parameter includes the forward rotation angle;

[0022] In the ZX plane, the forward rotation of the digital human body model is controlled by the forward rotation parameters to obtain the third dummy model.

[0023] Optionally, obtaining the first head motion curve tangent to the first dummy model based on the designed backrest angle includes:

[0024] When the digital human body model is in the position corresponding to the designed backrest angle, the first seat reference point, the first rear point and the second rear point corresponding to the first dummy model are obtained, wherein the first rear point and the second rear point are both located above and behind the first seat reference point;

[0025] The first head motion curve is obtained based on the first curve corresponding to the first seat reference point, the second curve corresponding to the first rear point, and the third curve corresponding to the second rear point, wherein the first head motion curve is tangent to the first dummy model.

[0026] Optionally, obtaining the second head motion curve tangent to the second dummy model based on the maximum backrest angle of the rear seat includes:

[0027] When the digital human body model is in the position corresponding to the maximum backrest angle, the second seat reference point, the third rear point and the fourth rear point of the second dummy model are obtained, wherein the third rear point and the fourth rear point are both located above and behind the second seat reference point;

[0028] The second head motion curve is obtained based on the fourth curve corresponding to the second seat reference point, the fifth curve corresponding to the third rear point, and the sixth curve corresponding to the fourth rear point, wherein the second head motion curve is tangent to the second dummy model.

[0029] Optionally, obtaining the third head motion curve tangent to the third dummy model based on the minimum backrest angle of the rear seat includes:

[0030] When the digital human body model is in the position corresponding to the minimum backrest angle, the third seat reference point, the fifth rear point, and the sixth rear point of the third dummy model are obtained, wherein the fifth rear point and the sixth rear point are both located above and behind the third seat reference point;

[0031] The third head motion curve is obtained based on the seventh curve corresponding to the third seat reference point, the eighth curve corresponding to the fifth rear point, and the ninth curve corresponding to the sixth rear point, wherein the third head motion curve is tangent to the third dummy model.

[0032] A second aspect of the present invention also provides a device for obtaining the head restraint surface of a rear seat in a vehicle, the device comprising:

[0033] Z-direction constraint surface acquisition unit is used to acquire the head Z-direction constraint surface based on the design backrest angle of the rear seat and the head Z-direction design value of the target vehicle.

[0034] The head motion curve acquisition unit is used to acquire a first head motion curve tangent to a first dummy model based on the designed backrest angle, wherein the first dummy model is obtained based on the designed backrest angle, the Z-axis head constraint surface, and the constraint conditions when the digital human body model is located in the rear seat; to acquire a second head motion curve tangent to a second dummy model based on the maximum backrest angle of the rear seat, wherein the second dummy model is obtained based on the maximum backrest angle and the backward rotation parameters of the digital human body model; and to acquire a third head motion curve tangent to a third dummy model based on the minimum backrest angle of the rear seat, wherein the third dummy model is obtained based on the minimum backrest angle and the forward rotation parameters of the digital human body model.

[0035] The head restraint surface acquisition unit is used to obtain the target head restraint surface of the target vehicle based on the first head motion curve, the second head motion curve and the third head motion curve.

[0036] A third aspect of the present invention provides an electronic device including a memory and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by one or more processors, the one or more programs containing operation instructions for performing the method for obtaining the head restraint surface of the rear seat of a vehicle as provided in the first aspect.

[0037] The above-described one or more technical solutions in the embodiments of this application have at least the following technical effects:

[0038] Based on the above technical solution, a head Z-axis constraint surface is obtained according to the design backrest angle and head Z-axis design value of the rear seats of the target vehicle; a first head motion curve tangent to the first dummy model is obtained according to the design backrest angle; a second head motion curve tangent to the second dummy model is obtained according to the maximum backrest angle; a third head motion curve tangent to the third dummy model is obtained according to the minimum backrest angle; the target head constraint surface of the target vehicle is obtained based on the first head motion curve, the second head motion curve, and the third head motion curve; due to the first head motion curve... The first head motion curve is tangent to the first dummy model, the second head motion curve is tangent to the second dummy model, and the third head motion curve is tangent to the third dummy model. The first dummy model is obtained based on the design backrest angle, the second dummy model is obtained based on the maximum backrest angle, and the third dummy model is obtained based on the minimum backrest angle. Therefore, it can be seen that the target head restraint surface obtained by the first, second, and third head motion curves will not collide with the car roof at the above three angles. This can reduce the probability of passengers' heads hitting the roof when the seat backrest angle of the car is adjustable, thereby improving the safety performance of the car's head space. Attached Figure Description

[0039] Figure 1 A flowchart illustrating the method for obtaining the head restraint surface of the rear seat of a vehicle, as provided in an embodiment of this application.

[0040] Figure 2 This is a schematic diagram of the structure of the first dummy model provided in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram of the structure of the second dummy model provided in an embodiment of this application;

[0042] Figure 4 A block diagram of a device for acquiring the head restraint surface of a vehicle's rear seat, provided in an embodiment of this application;

[0043] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0044] The main implementation principles, specific implementation methods, and corresponding beneficial effects of the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0045] Example

[0046] Please refer to Figure 1 This application provides a method for obtaining the head restraint surface of a vehicle's rear seat, the method comprising:

[0047] S101. Based on the design backrest angle and Z-direction design value of the rear seats of the target vehicle, obtain the Z-direction head restraint surface.

[0048] S102. Based on the designed backrest angle, obtain the first head motion curve that is tangent to the first dummy model, wherein the first dummy model is obtained based on the designed backrest angle, the head Z-direction limiting surface, and the constraint conditions when the digital human body model is located in the rear seat.

[0049] S103. Based on the maximum backrest angle of the rear seat, obtain a second head motion curve that is tangent to the second dummy model, wherein the second dummy model is obtained based on the maximum backrest angle and the rearward rotation parameters of the digital human body model;

[0050] S104. Based on the minimum backrest angle of the rear seat, obtain the third head motion curve that is tangent to the third dummy model, wherein the third dummy model is obtained based on the minimum backrest angle and the forward rotation parameters of the digital human body model.

[0051] S105. Based on the first head motion curve, the second head motion curve, and the third head motion curve, the target head restriction surface of the target vehicle is obtained.

[0052] The method for obtaining the head restraint surface of the rear seat of a vehicle in the embodiments of this specification is typically used in a server or user terminal. The server may be an electronic device such as a laptop, desktop computer, tablet computer, or all-in-one computer, and the user terminal may be an electronic device such as a smartphone, tablet computer, laptop, desktop computer, tablet computer, or all-in-one computer.

[0053] In step S101, the original angle of the rear seat can be pre-designed as the design backrest angle, and the minimum backrest angle and maximum backrest angle of the rear seat can also be set. The maximum backrest angle refers to the maximum angle that the rear seat can be adjusted, excluding the angle when the rear seat is folded down.

[0054] Specifically, after obtaining the design backrest angle, the passenger head envelope can be offset in the Z direction based on the design backrest angle and the Z-direction design value of the head, thus obtaining the Z-direction constraint surface of the head.

[0055] Specifically, based on the designed backrest angle, the Z-axis space design value for the head can be obtained as H1mm. Then, the standard head envelope is obtained as the passenger head envelope, and the passenger head envelope is offset by H1mm in the Z-axis direction to obtain the head Z-axis limiting surface. For example, taking the SAEJ1052 standard head envelope as an example, the SAEJ1052 standard head envelope can be offset by H1mm in the Z-axis direction, and this limiting surface can be output as the head Z-axis limiting surface.

[0056] After obtaining the Z-axis constraint surface of the head, step S102 is executed.

[0057] Before step S102, the first dummy model needs to be obtained. After obtaining the first dummy model, step S102 is then executed.

[0058] The steps for obtaining the first dummy model include: obtaining the backrest angle conditions and head constraint conditions corresponding to the design backrest angle and the head constraint surface in the Z direction based on the design backrest angle and the head constraint surface; obtaining the constraint conditions based on the backrest angle conditions and the head constraint conditions; and adjusting the parameters of the digital human body model according to the constraint conditions to obtain the first dummy model.

[0059] The digital human body model can be, for example, a RAMSIS dummy. The following example uses a RAMSIS dummy. Furthermore, the backrest angle condition refers to the RAMSIS dummy's torso angle being a set backrest angle, or it can be within an adjacent angle range. The adjacent angle range refers to the range of angles within which the dummy can move left or right without exceeding the set angle, with the set backrest angle as the origin. The set angle can be set according to actual needs, or it can be set manually or by the equipment. For example, if the set backrest angle is A2° and the set angle is 1°, then the adjacent angle range can be (A2-1)° to (A2+1)°. Additionally, the head restriction condition can be that the RAMSIS dummy's head is tangent to the head restriction surface, or that the RAMSIS dummy's head is not in contact with the head restriction surface, etc. This specification does not specify specific restrictions.

[0060] In another embodiment, the constraints may also include the hip point (H point) coinciding with the seat reference (SgRP) point of the rear seat. Of course, the constraints may also include the feet of the RAMSIS dummy being tangent to the carpet surface of the target car, etc. Here, the H point refers to the connection point between the human torso and the thigh in a two-dimensional or three-dimensional human body model.

[0061] Thus, after obtaining the constraints, the parameters of the digital human body model can be adjusted according to the constraints to obtain model parameters such as height and position of the digital human body model. The model parameters are then input into the digital human body model to obtain the first dummy model.

[0062] For example, see Figure 2 If the backrest angle is designed to be A2, then the RAMSIS dummy 20 follows the following constraints: the H point of the RAMSIS dummy 20 coincides with the SgRP point of the rear seat; the head of the RAMSIS dummy 20 is tangent to the Z-direction head constraint surface 21; the torso angle of the RAMSIS dummy 20 is A2; and the feet of the RAMSIS dummy 20 are tangent to the carpet surface. At this point, the height of the RAMSIS dummy 20 can be obtained as X mm, and its position as A21. The dummy model B2 is then output, where B2 is the first dummy model.

[0063] After obtaining the first dummy model, proceed to step S102.

[0064] Specifically, when the digital human body model is positioned at the designed backrest angle, the first seat reference point, first rear point, and second rear point corresponding to the first dummy model can be obtained. Both the first and second rear points are located above and behind the first seat reference point. Based on the first curve corresponding to the first seat reference point, the second curve corresponding to the first rear point, and the third curve corresponding to the second rear point, the first head motion curve is obtained, where the first head motion curve is tangent to the first dummy model. Alternatively, other methods can be used to obtain the first head motion curve. A head motion curve model can be created, and parameters used to input the model can be obtained when the digital human body model is positioned at the designed backrest angle. These parameters may include the parameters of the first dummy model itself, the designed backrest angle, the minimum backrest angle, and the maximum backrest angle. The curve output by the model can then be used as the first head motion curve. Furthermore, the motion trajectory of the first dummy model can be simulated when the digital human body model is positioned at the designed backrest angle, and the first head motion curve can be obtained based on the simulation results. This specification does not impose specific limitations on this method.

[0065] Specifically, when obtaining the first rear point and the second rear point, the ZX plane passing through the first seat reference point can be obtained. Based on the ZX plane, the point where the vertical line passing through the first set length behind the first seat reference point intersects with the head of the first dummy model can be obtained as the first rear point. Also, based on the ZX plane, the second set length above the first seat reference point can be obtained, the horizontal line passing through the second set length can be obtained, and the third set length behind the first seat reference point can be obtained from the horizontal line as the second rear point.

[0066] Furthermore, after obtaining the first rear point, the second rear point, and the first seat reference point, arcs are sequentially drawn using the first rear point, the second rear point, and the first seat reference point to obtain the arc corresponding to the first seat reference point as the first curve, the arc corresponding to the first rear point as the second curve, and the arc corresponding to the second rear point as the third curve. The first curve and the second curve are then tangent to each other and connected, and the first curve and the third curve are then tangent to each other and connected to obtain a combined curve as the first head motion curve. At this time, the first head motion curve is tangent to the head of the first dummy model.

[0067] Since the first head motion curve is tangent to the head of the RAMSIS dummy (first dummy model) located at the designed backrest angle, the roof is designed according to the first head motion curve so that the roof matches the first head motion curve, thereby reducing the probability that the user will hit the roof when the rear seat is adjusted to the designed backrest angle.

[0068] After performing step S102, step S103 is performed. Steps S103 and S102 can be performed simultaneously, or step S103 can be performed first and then step S102. This specification does not impose specific restrictions.

[0069] Before step S103, the second dummy model needs to be obtained first. After obtaining the second dummy model, step S103 is then executed.

[0070] The steps for obtaining the second dummy model include: obtaining the rearward rotation angle of the digital human body model based on the maximum backrest angle and the designed backrest angle, wherein the rearward rotation parameter includes the rearward rotation angle; and controlling the rearward rotation of the digital human body model in the ZX plane using the rearward rotation parameter to obtain the second dummy model.

[0071] Specifically, after obtaining the first dummy model, a digital human body model can be obtained from the first dummy model. This digital human body model is then rotated backward to the maximum backrest angle to obtain the second dummy model. In this way, the backward rotation angle can be the first difference between the maximum backrest angle and the designed backrest angle. Alternatively, it can be the product of the first difference and a weight; this specification does not impose specific limitations. The following example uses the backward rotation angle as the first difference.

[0072] Specifically, when controlling the backward rotation of the digital human body model using the backward rotation parameter, the digital human body model can rotate around the seat reference point. Of course, it can also rotate around point H. This manual does not impose any specific restrictions.

[0073] For example, if the maximum backrest angle is A3, in the ZX plane, if the RAMSIS dummy located at A21 is obtained, the backward rotation angle can be determined to be (A3-A2)°. Thus, the RAMSIS dummy can be controlled to rotate backward around the SgRP point by (A3-A2)° to obtain the RAMSIS dummy position as A22, and the dummy model B3 is output, where B2 is the second dummy model.

[0074] After obtaining the second dummy model, proceed to step S103.

[0075] Specifically, when the digital human body model is positioned at the maximum backrest angle, the second seat reference point, third rear point, and fourth rear point of the second dummy model can be obtained. The third and fourth rear points are both located above and behind the second seat reference point. Based on the fourth curve corresponding to the second seat reference point, the fifth curve corresponding to the third rear point, and the sixth curve corresponding to the fourth rear point, the second head motion curve is obtained, where the second head motion curve is tangent to the second dummy model. Alternatively, other methods can be used to obtain the second head motion curve. A head motion curve model can be created, and parameters used as input to the model can be obtained when the digital human body model is positioned at the maximum backrest angle. These parameters may include the second dummy model's own parameters, the minimum backrest angle, and the maximum backrest angle. The resulting curve is then used as the second head motion curve. Furthermore, the motion trajectory of the second dummy model can be simulated when the digital human body model is positioned at the maximum backrest angle, and the second head motion curve can be obtained based on the simulation results. This specification does not impose specific limitations on this method.

[0076] Specifically, when obtaining the third and fourth rear points, the ZX plane passing through the second seat reference point can be obtained. Based on the ZX plane, the point where the vertical line passing through the fourth predetermined length behind the second seat reference point intersects with the head of the second dummy model can be obtained as the third rear point. Also, based on the ZX plane, the fifth predetermined length above the second seat reference point can be obtained, the horizontal line passing through the fifth predetermined length can be obtained, and the sixth predetermined length behind the second seat reference point can be obtained from the horizontal line as the fourth rear point.

[0077] Furthermore, after obtaining the third rear point, the fourth rear point, and the second seat reference point, arcs are successively drawn using the third rear point, the fourth rear point, and the second seat reference point to obtain the arc corresponding to the second seat reference point as the fourth curve, the arc corresponding to the third rear point as the fifth curve, and the arc corresponding to the fourth rear point as the sixth curve. The fourth curve and the fifth curve are then tangent to each other and connected. The fourth curve and the ninth curve are then tangent to each other and connected to each other to obtain a combined curve as the second head motion curve. At this time, the second head motion curve is tangent to the head of the second dummy model.

[0078] Since the second head motion curve is tangent to the head of the RAMSIS dummy (second dummy model) located at the maximum backrest angle, the roof can be designed according to the second head motion curve to match the second head motion curve, thereby reducing the probability of the user hitting the roof when the rear seat is adjusted to the maximum backrest angle.

[0079] After performing step S103, step S104 is performed. Steps S104 and S103 can be performed simultaneously, or step S104 can be performed first and then step S103. This specification does not impose specific restrictions.

[0080] Before step S104, the third dummy model needs to be obtained first. After obtaining the third dummy model, step S104 is then executed.

[0081] The steps for obtaining the third dummy model include: obtaining the forward rotation angle of the digital human body model based on the minimum backrest angle and the design backrest angle, wherein the forward rotation parameter includes the forward rotation angle; and controlling the forward rotation of the digital human body model in the ZX plane using the forward rotation parameter to obtain the third dummy model.

[0082] Specifically, after obtaining the first dummy model, a digital human body model can be obtained from the first dummy model. This digital human body model is then rotated forward to the minimum backrest angle to obtain the third dummy model. In this way, the forward rotation angle can be the second difference between the designed backrest angle and the minimum backrest angle. Alternatively, it can be the product of the second difference and a weight; this specification does not impose specific limitations. The following example uses the forward rotation angle as the second difference.

[0083] Specifically, when controlling the forward rotation of the digital human body model using the forward rotation parameter, the digital human body model can rotate around the seat reference point. Of course, it can also rotate around point H. This manual does not impose any specific restrictions.

[0084] For example, if the minimum backrest angle is A1, in the ZX plane, if the RAMSIS dummy is located at A21, the forward rotation angle can be determined to be (A2-A1)°, so the RAMSIS dummy can be controlled to rotate backward around the SgRP point by (A2-A1)°, and the RAMSIS dummy position is A23, and the dummy model B1 is output; where B1 is the third dummy model.

[0085] And, after obtaining the third dummy model, step S104 is executed.

[0086] Specifically, when the digital human body model is positioned at the minimum backrest angle, the third seat reference point, fifth rear point, and sixth rear point of the third dummy model are obtained. The fifth and sixth rear points are both located above and behind the third seat reference point. Based on the seventh curve corresponding to the third seat reference point, the eighth curve corresponding to the fifth rear point, and the ninth curve corresponding to the sixth rear point, the third head motion curve is obtained. This third head motion curve is tangent to the third dummy model. Of course, other methods can also be used to obtain the third head motion curve; for details on other methods, please refer to the description of the second head motion curve. For the sake of brevity, these will not be elaborated upon here.

[0087] Specifically, when obtaining the fifth and sixth rear points, the ZX plane passing through the third seat reference point can be obtained. Based on the ZX plane, the point where the vertical line passing through the seventh predetermined length behind the third seat reference point intersects with the head of the third dummy model can be obtained as the fifth rear point. Also, based on the ZX plane, the horizontal line passing through the eighth predetermined length above the third seat reference point can be obtained, and the ninth predetermined length behind the third seat reference point can be obtained from the horizontal line as the sixth rear point.

[0088] Furthermore, after obtaining the fifth rear point, the sixth rear point, and the third seat reference point, arcs are successively drawn using the fifth rear point, the sixth rear point, and the third seat reference point to obtain the arc corresponding to the third seat reference point as the seventh curve, the arc corresponding to the fifth rear point as the eighth curve, and the arc corresponding to the sixth rear point as the ninth curve. The seventh curve and the eighth curve are then tangent to each other and connected, and the seventh curve and the ninth curve are then tangent to each other and connected to obtain a combined curve as the third head motion curve. At this time, the third head motion curve is tangent to the head of the third dummy model.

[0089] In the embodiments described in this specification, the first seat reference point, the second seat reference point, and the third seat reference point are the same point, namely, the seat reference point of the rear seat.

[0090] For example, see Figure 3 When obtaining the third head motion curve, when the torso angle of RAMSIS dummy 20 is A1, the ZX plane passing through the SgRP point is obtained: at dx2 (seventh set length) behind the SgRP point, the point where the vertical line passing through dx2 connects with the head of RAMSIS dummy 20 is obtained as point P1 (fifth rear point). With P1 as the center and radius R1 (R1 = 90), an arc is drawn to obtain the eighth curve; at dz (eighth set length) above the SgRP point, the horizontal line passing through dz is obtained. From the horizontal line, the point at dx1 (ninth set length) behind the SgRP point is taken as point P2 (sixth rear point). With P2 as the center and radius R2, an arc is drawn to obtain the ninth curve; and with the SgRP point as the center and radius R3, an arc is drawn to obtain the seventh curve. Wherein, dx1=-0.0558×A1×A1+13.54×A1-180.91, dz=-0.0688×A1×A1+0.4972×A1+682.06, dx2=8.0473×A1+84.8.

[0091] When obtaining the third head motion curve C1 based on the above three curves, constraints can be added such that the seventh curve is tangent to and connected to the eighth curve, and the seventh curve is tangent to and connected to the ninth curve. Thus, the seventh curve, the eighth curve, and the ninth curve are connected to obtain the third head motion curve C1. At this time, the third head motion curve C1 is tangent to the RAMSIS dummy 20 located at the minimum backrest angle.

[0092] Since the third head motion curve is tangent to the head of RAMSIS dummy 20 (third dummy model) located at the minimum backrest angle, the roof can be designed according to the third head motion curve so that the roof matches the third head motion curve, thereby reducing the probability of the user hitting the roof when the rear seat is adjusted to the minimum backrest angle.

[0093] In another embodiment, the first set length can be -0.0558×A2×A2+13.54×A2-180.91, the second set length can be -0.0688×A2×A2+0.4972×A2+682.06, the third set length can be 8.0473×A2+84.8; and the fourth set length can be -0.0558×A3×A3+13.54×A3-180.91, the fifth set length can be -0.0688×A3×A3+0.4972×A3+682.06, and the sixth set length can be 8.0473×A3+84.8, where A2 is the designed backrest angle and A3 is the maximum backrest angle.

[0094] And, after obtaining the first, second and third head motion curves, step S105 is executed.

[0095] Specifically, after obtaining the first, second, and third head motion curves, the first, second, and third head motion curves are connected to obtain the target head constraint surface; of course, the first head motion curve can also be tangent to and connected with the second head motion curve, and the first head motion curve can be tangent to and connected with the third head motion curve to obtain the target head constraint surface.

[0096] Since the first head motion curve is tangent to the head of the RAMSIS dummy (first dummy model) located at the designed backrest angle, the second head motion curve is tangent to the head of the RAMSIS dummy (second dummy model) located at the maximum backrest angle, and the third head motion curve is tangent to the head of the RAMSIS dummy (third dummy model) located at the minimum backrest angle, the target head restraint surface obtained from the first, second, and third head motion curves can be tangent to the head of the digital human body model at any position from the minimum to the maximum backrest angle. This reduces the probability of passengers' heads hitting the roof when the seat backrest angle of the car is adjustable, thereby improving the safety performance of the car's headroom.

[0097] The above-described one or more technical solutions in the embodiments of this application have at least the following technical effects:

[0098] Based on the above technical solution, a head Z-axis constraint surface is obtained according to the design backrest angle and head Z-axis design value of the rear seats of the target vehicle; a first head motion curve tangent to the first dummy model is obtained according to the design backrest angle; a second head motion curve tangent to the second dummy model is obtained according to the maximum backrest angle; a third head motion curve tangent to the third dummy model is obtained according to the minimum backrest angle; the target head constraint surface of the target vehicle is obtained based on the first head motion curve, the second head motion curve, and the third head motion curve; due to the first head motion curve... The first head motion curve is tangent to the first dummy model, the second head motion curve is tangent to the second dummy model, and the third head motion curve is tangent to the third dummy model. The first dummy model is obtained based on the design backrest angle, the second dummy model is obtained based on the maximum backrest angle, and the third dummy model is obtained based on the minimum backrest angle. Therefore, it can be seen that the target head restraint surface obtained by the first, second, and third head motion curves will not collide with the car roof at the above three angles. This can reduce the probability of passengers' heads hitting the roof when the seat backrest angle of the car is adjustable, thereby improving the safety performance of the car's head space.

[0099] In relation to the above embodiments that provide a method for obtaining the head restraint surface of a vehicle's rear seat, this application also provides a corresponding device for obtaining the head restraint surface of a vehicle's rear seat. Please refer to... Figure 4 The device includes:

[0100] Z-direction constraint surface acquisition unit 401 is used to acquire the head Z-direction constraint surface based on the design backrest angle of the rear seat and the head Z-direction design value of the target vehicle.

[0101] The head motion curve acquisition unit 402 is used to acquire a first head motion curve tangent to a first dummy model based on the designed backrest angle, wherein the first dummy model is obtained based on the designed backrest angle, the Z-axis head constraint surface, and the constraint conditions when the digital human body model is located in the rear seat; to acquire a second head motion curve tangent to a second dummy model based on the maximum backrest angle of the rear seat, wherein the second dummy model is obtained based on the maximum backrest angle and the backward rotation parameters of the digital human body model; and to acquire a third head motion curve tangent to a third dummy model based on the minimum backrest angle of the rear seat, wherein the third dummy model is obtained based on the minimum backrest angle and the forward rotation parameters of the digital human body model.

[0102] The head restraint surface acquisition unit 403 is used to obtain the target head restraint surface of the target vehicle based on the first head motion curve, the second head motion curve and the third head motion curve.

[0103] In one optional embodiment, the Z-direction limiting surface acquisition unit 401 is used to perform Z-direction offset processing on the passenger head envelope according to the design backrest angle and the Z-direction design value of the head, so as to obtain the Z-direction limiting surface of the head.

[0104] In one alternative implementation, it further includes:

[0105] The dummy model acquisition unit is used to acquire, based on the designed backrest angle and the head Z-direction constraint surface, the backrest angle condition corresponding to the designed backrest angle and the head Z-direction constraint surface; acquire the constraint conditions based on the backrest angle condition and the head constraint conditions; and adjust the parameters of the digital human body model according to the constraint conditions to obtain the first dummy model.

[0106] In one optional embodiment, the dummy model acquisition unit is used to acquire the rearward rotation angle of the digital human body model based on the maximum backrest angle and the designed backrest angle, wherein the rearward rotation parameter includes the rearward rotation angle; and in the ZX plane, the rearward rotation of the digital human body model is controlled using the rearward rotation parameter to obtain the second dummy model.

[0107] In one optional embodiment, the dummy model acquisition unit is used to acquire the forward rotation angle of the digital human body model based on the minimum backrest angle and the designed backrest angle, wherein the forward rotation parameter includes the forward rotation angle; and in the ZX plane, the forward rotation of the digital human body model is controlled by the forward rotation parameter to obtain the third dummy model.

[0108] In one optional embodiment, the head motion curve acquisition unit 402 is used to acquire a first seat reference point, a first rear point, and a second rear point corresponding to the first dummy model when the digital human body model is at the position corresponding to the designed backrest angle, wherein the first rear point and the second rear point are both located above and behind the first seat reference point; and to obtain the first head motion curve based on the first curve corresponding to the first seat reference point, the second curve corresponding to the first rear point, and the third curve corresponding to the second rear point, wherein the first head motion curve is tangent to the first dummy model.

[0109] In one optional embodiment, the head motion curve acquisition unit 402 is used to acquire the second seat reference point, the third rear point, and the fourth rear point of the second dummy model when the digital human body model is at the position corresponding to the maximum backrest angle, wherein the third rear point and the fourth rear point are both located above and behind the second seat reference point; and to obtain the second head motion curve based on the fourth curve corresponding to the second seat reference point, the fifth curve corresponding to the third rear point, and the sixth curve corresponding to the fourth rear point, wherein the second head motion curve is tangent to the second dummy model.

[0110] In one optional embodiment, the head motion curve acquisition unit 402 is used to acquire the third seat reference point, the fifth rear point, and the sixth rear point of the third dummy model when the digital human body model is in the position corresponding to the minimum backrest angle, wherein the fifth rear point and the sixth rear point are both located above and behind the third seat reference point; and to obtain the third head motion curve based on the seventh curve corresponding to the third seat reference point, the eighth curve corresponding to the fifth rear point, and the ninth curve corresponding to the sixth rear point, wherein the third head motion curve is tangent to the third dummy model.

[0111] Regarding the apparatus in the above embodiments, the specific manner in which each unit performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0112] Figure 5 This is a block diagram illustrating an electronic device 800 for a method of obtaining the head restraint surface of a rear seat in a vehicle, according to an exemplary embodiment. For example, the electronic device 800 may be a mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, medical device, fitness equipment, personal digital assistant, etc.

[0113] Reference Figure 5 The electronic device 800 may include one or more of the following components: a processing component 802, a memory 804, a power supply component 806, a multimedia component 808, an audio component 810, an input / display (I / O) interface 812, a sensor component 814, and a communication component 816.

[0114] Processing component 802 typically controls the overall operation of electronic device 800, such as operations associated with display, telephone calls, data communication, camera operation, and recording operations. Processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the methods described above. Furthermore, processing component 802 may include one or more modules to facilitate interaction between processing component 802 and other components. For example, processing component 802 may include a multimedia module to facilitate interaction between multimedia component 808 and processing component 802.

[0115] Memory 804 is configured to store various types of data to support the operation of device 800. Examples of this data include instructions for any application or method operating on electronic device 800, contact data, phonebook data, messages, pictures, videos, etc. Memory 804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0116] Power supply component 806 provides power to various components of electronic device 800. Power supply component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 800.

[0117] Multimedia component 808 includes a screen that provides a display interface between the electronic device 800 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of the touch or swipe action but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 808 includes a front-facing camera and / or a rear-facing camera. When the device 800 is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0118] Audio component 810 is configured to display and / or input audio signals. For example, audio component 810 includes a microphone (MIC) configured to receive external audio signals when electronic device 800 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 804 or transmitted via communication component 816. In some embodiments, audio component 810 also includes a speaker for displaying audio signals.

[0119] I / O interface 812 provides an interface between processing component 802 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0120] Sensor assembly 814 includes one or more sensors for providing state assessments of various aspects of electronic device 800. For example, sensor assembly 814 may detect the on / off state of device 800, the relative positioning of components such as the display and keypad of electronic device 800, changes in position of electronic device 800 or a component of electronic device 800, the presence or absence of user contact with electronic device 800, orientation or acceleration / deceleration of electronic device 800, and temperature changes of electronic device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 814 may also include an accelerometer, gyroscope, magnetometer, pressure sensor, or temperature sensor.

[0121] Communication component 816 is configured to facilitate wired or wireless communication between electronic device 800 and other devices. Electronic device 800 can access wireless networks based on communication standards, such as WiFi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 816 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0122] In an exemplary embodiment, the electronic device 800 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0123] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 804 including instructions, which can be executed by a processor 820 of an electronic device 800 to perform the above-described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0124] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0125] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0126] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for obtaining the head restraint surface of a vehicle's rear seat, characterized in that, The method includes: Based on the design backrest angle and Z-direction design value of the rear seats of the target vehicle, obtain the Z-direction head constraint surface; The step of obtaining the head Z-direction constraint surface based on the design backrest angle and head Z-direction design value of the rear seats of the target vehicle includes: Based on the designed backrest angle and the designed Z-direction head value, the passenger head envelope is offset in the Z-direction to obtain the Z-direction head constraint surface. Based on the designed backrest angle, a first head motion curve tangent to the first dummy model is obtained, wherein the first dummy model is obtained based on the designed backrest angle, the head Z-direction limiting surface, and the constraint conditions when the digital human body model is located in the rear seat; The constraints of the first dummy model include "the H point of the digital human body model coincides with the SgRP point of the rear seat, and the feet are tangent to the carpet surface"; The step of obtaining the first head motion curve tangent to the first dummy model based on the designed backrest angle includes: When the digital human body model is in the position corresponding to the designed backrest angle, the first seat reference point, the first rear point and the second rear point corresponding to the first dummy model are obtained, wherein the first rear point and the second rear point are both located above and behind the first seat reference point; The first head motion curve is obtained based on the first curve corresponding to the first seat reference point, the second curve corresponding to the first rear point, and the third curve corresponding to the second rear point, wherein the first head motion curve is tangent to the first dummy model. When obtaining the first rear point and the second rear point, the ZX plane passing through the first seat reference point can be obtained. Based on the ZX plane, the point where the vertical line passing through the first set length behind the first seat reference point intersects with the head of the first dummy model can be obtained as the first rear point. Also, based on the ZX plane, the second set length above the first seat reference point can be obtained, the horizontal line passing through the second set length can be obtained, and the third set length behind the first seat reference point can be obtained from the horizontal line as the second rear point. Furthermore, after obtaining the first rear point, the second rear point, and the first seat reference point, arcs are drawn sequentially using the first rear point, the second rear point, and the first seat reference point to obtain the arc corresponding to the first seat reference point as the first curve, the arc corresponding to the first rear point as the second curve, and the arc corresponding to the second rear point as the third curve. The first curve and the second curve are tangent and connected, and the first curve and the third curve are tangent and connected to obtain a combined curve as the first head motion curve. At this time, the first head motion curve is tangent to the head of the first dummy model. Based on the maximum backrest angle of the rear seat, a second head motion curve tangent to the second dummy model is obtained, wherein the second dummy model is obtained based on the maximum backrest angle and the rearward rotation parameters of the digital human body model; the second dummy model rotates around the SgRP point in the ZX plane, and the rotation angle is "the difference between the maximum backrest angle and the designed backrest angle"; Based on the minimum backrest angle of the rear seat, a third head motion curve tangent to the third dummy model is obtained, wherein the third dummy model is obtained based on the minimum backrest angle and the forward rotation parameters of the digital human body model; the third dummy model rotates around the SgRP point in the ZX plane, and the rotation angle is "the difference between the minimum backrest angle and the designed backrest angle"; The target head restraint surface of the target vehicle is obtained based on the first head motion curve, the second head motion curve, and the third head motion curve.

2. The method as described in claim 1, characterized in that, The steps for obtaining the first dummy model include: Based on the designed backrest angle and the head Z-direction limiting surface, obtain the backrest angle condition corresponding to the designed backrest angle and the head limiting condition of the head Z-direction limiting surface; The constraint conditions are obtained based on the backrest angle condition and the head restraint condition; The parameters of the digital human body model are adjusted according to the constraints to obtain the first dummy model.

3. The method as described in claim 1, characterized in that, The step of obtaining the second head motion curve tangent to the second dummy model based on the maximum backrest angle of the rear seat includes: When the digital human body model is in the position corresponding to the maximum backrest angle, the second seat reference point, the third rear point and the fourth rear point of the second dummy model are obtained, wherein the third rear point and the fourth rear point are both located above and behind the second seat reference point; The second head motion curve is obtained based on the fourth curve corresponding to the second seat reference point, the fifth curve corresponding to the third rear point, and the sixth curve corresponding to the fourth rear point, wherein the second head motion curve is tangent to the second dummy model.

4. The method as described in claim 3, characterized in that, The step of obtaining the third head motion curve tangent to the third dummy model based on the minimum backrest angle of the rear seat includes: When the digital human body model is in the position corresponding to the minimum backrest angle, the third seat reference point, the fifth rear point, and the sixth rear point of the third dummy model are obtained, wherein the fifth rear point and the sixth rear point are both located above and behind the third seat reference point; The third head motion curve is obtained based on the seventh curve corresponding to the third seat reference point, the eighth curve corresponding to the fifth rear point, and the ninth curve corresponding to the sixth rear point, wherein the third head motion curve is tangent to the third dummy model.

5. A device for acquiring the head restraint surface of a vehicle's rear seat, characterized in that, The device includes: Z-direction constraint surface acquisition unit is used to acquire the head Z-direction constraint surface based on the design backrest angle of the rear seat and the head Z-direction design value of the target vehicle. The step of obtaining the head Z-direction constraint surface based on the design backrest angle and head Z-direction design value of the rear seats of the target vehicle includes: Based on the designed backrest angle and the designed Z-direction head value, the passenger head envelope is offset in the Z-direction to obtain the Z-direction head constraint surface. The head motion curve acquisition unit is used to acquire a first head motion curve tangent to the first dummy model based on the designed backrest angle, wherein the first dummy model is obtained based on the designed backrest angle, the head Z-direction constraint surface, and the constraint conditions when the digital human body model is located in the backrest of the rear row. The constraints of the first dummy model include "the H point of the digital human body model coincides with the SgRP point of the rear seat, and the feet are tangent to the carpet surface"; The step of obtaining the first head motion curve tangent to the first dummy model based on the designed backrest angle includes: When the digital human body model is in the position corresponding to the designed backrest angle, the first seat reference point, the first rear point and the second rear point corresponding to the first dummy model are obtained, wherein the first rear point and the second rear point are both located above and behind the first seat reference point; The first head motion curve is obtained based on the first curve corresponding to the first seat reference point, the second curve corresponding to the first rear point, and the third curve corresponding to the second rear point, wherein the first head motion curve is tangent to the first dummy model. When obtaining the first rear point and the second rear point, the ZX plane passing through the first seat reference point can be obtained. Based on the ZX plane, the point where the vertical line passing through the first set length behind the first seat reference point intersects with the head of the first dummy model can be obtained as the first rear point. Also, based on the ZX plane, the second set length above the first seat reference point can be obtained, the horizontal line passing through the second set length can be obtained, and the third set length behind the first seat reference point can be obtained from the horizontal line as the second rear point. Furthermore, after obtaining the first rear point, the second rear point, and the first seat reference point, arcs are drawn sequentially using the first rear point, the second rear point, and the first seat reference point to obtain the arc corresponding to the first seat reference point as the first curve, the arc corresponding to the first rear point as the second curve, and the arc corresponding to the second rear point as the third curve. The first curve and the second curve are tangent and connected, and the first curve and the third curve are tangent and connected to obtain a combined curve as the first head motion curve. At this time, the first head motion curve is tangent to the head of the first dummy model. Based on the maximum backrest angle of the rear seat, a second head motion curve tangent to the second dummy model is obtained, wherein the second dummy model is obtained based on the maximum backrest angle and the backward rotation parameters of the digital human body model; based on the minimum backrest angle of the rear seat, a third head motion curve tangent to the third dummy model is obtained, wherein the third dummy model is obtained based on the minimum backrest angle and the forward rotation parameters of the digital human body model; the second dummy model rotates around point SgRP in the ZX plane, and the rotation angle is "the difference between the maximum backrest angle and the designed backrest angle"; The head restraint surface acquisition unit is used to obtain the target head restraint surface of the target vehicle based on the first head motion curve, the second head motion curve and the third head motion curve.

6. An electronic device, characterized in that, It includes a memory and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by one or more processors, the one or more programs containing operation instructions for performing the methods described in any one of claims 1 to 4.

Images