Design method and design device for light truck airbag shock absorbing seat

Abstract

The application relates to a design method and a design device for a light truck airbag shock-absorbing seat flattening, characterized by comprising the following steps: acquiring a main driver R point coordinate, a main driver flattening coordinate and a first preset height difference, wherein the first preset height difference is a Z-direction height difference between the main driver R point and a main driver H point; acquiring the main driver H point coordinate based on the acquired main driver R point coordinate, the first preset height difference and a driver field of view requirement, wherein the driver field of view requirement at least includes a front field of view area, an A-pillar binocular obstacle angle, a windshield transparent area and a steering wheel and instrument panel obstruction; acquiring a main driver flattening track and a copilot flattening track based on the main driver H point coordinate and the main driver flattening coordinate; sequentially judging whether the main driver flattening track and the copilot flattening track interfere with a space preset gap; if not, the seat flattening design is completed; and if yes, the main driver R point coordinate and the main driver flattening coordinate are re-acquired.

Description

Technical Field

[0001] This application relates to the field of automobile seat flattening design, and in particular to a design method and device for flattening a light truck airbag shock-absorbing seat. Background Technology

[0002] With the rapid development of the logistics and transportation industry, light trucks, as the main tool for urban delivery, have seen a continuous increase in their number. To improve drivers' working conditions and meet their rest needs during long-distance transport or while waiting for loading and unloading, seats with reclining functions are gradually becoming a trend in commercial vehicle configurations. Meanwhile, to enhance driving comfort, air-suspension seats, due to their excellent vibration isolation performance, are increasingly being used in mid-to-high-end light truck models.

[0003] However, when designing the flat-folding design for the air-suspension seats in pure electric light trucks, the height of the airbags changes under different loads and conditions, making it difficult to control the height difference between the seat in the driving state (R point) and the seat in the parked, flat-folded state (H point). If the H point shifts after the air-suspension seat is flat, it will affect the flatness of the driver and passenger seats, reduce resting comfort, and may even affect the vehicle's center of gravity or operational safety due to excessive height changes. Summary of the Invention

[0004] This application provides a design method and device for flattening the air-cushioned seat of a light truck, in order to solve the technical problem in the related art that the H point and R point are offset after the air-cushioned seat is flattened, which affects the flatness of the driver and passenger seats.

[0005] Firstly, a design method for folding down the air-suspension shock-absorbing seat of a light truck is provided, which includes the following steps: Obtain the coordinates of the driver's R point, the coordinates of the driver's flat position, and the first preset height difference, wherein the first preset height difference is the Z-axis height difference between the driver's R point and the driver's H point; Based on the obtained driver's R point coordinates, the first preset height difference, and the driver's vision requirements, the driver's H point coordinates are obtained. The driver's vision requirements include at least the forward vision area, the A-pillar binocular obstruction angle, the transparent area of ​​the windshield, and the obstruction by the steering wheel and dashboard. Based on the driver's H-point coordinates and the driver's flattening coordinates, obtain the driver's flattening trajectory and the passenger's flattening trajectory; The system sequentially determines whether the driver's seat and passenger's seat folding trajectories interfere with a preset spatial clearance. This preset spatial clearance is a pre-defined gap between the driver's seat and passenger's seat folding trajectories and the cab environment components. If not, then complete the seat folding design; If so, then reacquire the coordinates of the driver's R point and the coordinates of the driver's horizontal position.

[0006] In conjunction with the first aspect, in one implementation, obtaining the coordinates of the driver's side R point and the coordinates of the driver's side when it is level includes: Obtain preset parameters for the cab, which include at least spatial parameters, ergonomic parameters, and airbag shock absorption stroke parameters; Calculate the coordinates of the driver's R point based on the preset parameters of the driver's cab.

[0007] In conjunction with the first aspect, in one implementation, the first preset height difference is set to ±10mm.

[0008] In conjunction with the first aspect, in one implementation, obtaining the driver's driving trajectory based on the driver's H-point coordinates and the driver's driving leveling coordinates includes: Design a driver's seat angle adjustment mechanism based on the driver's seat H-point coordinates and the driver's seat flat coordinates; The driver's H-point coordinate is rotated to the driver's flat coordinate using the driver's angle adjustment mechanism to obtain the driver's flat trajectory.

[0009] In conjunction with the first aspect, in one embodiment, when the driver's seat angle adjustment mechanism rotates the driver's seat H-point coordinate to the driver's seat flat coordinate, the driver's seat angle adjustment mechanism is adjusted to an integer position.

[0010] In conjunction with the first aspect, in one implementation, obtaining the passenger-side leveling trajectory based on the driver's side H-point coordinates and the driver's side leveling coordinates includes: Obtain the second preset height difference between the passenger seat and the driver seat in the Z-direction when the seats are folded down; Based on the driver's H-point coordinates, the driver's flat coordinates, and the second preset height difference, the passenger's flat coordinates are obtained.

[0011] In conjunction with the first aspect, in one implementation, the second preset height difference is set to 5mm.

[0012] In conjunction with the first aspect, in one embodiment, the cab environment components include at least a cab floor, a dashboard, and a steering wheel.

[0013] In conjunction with the first aspect, in one embodiment, a design method for folding down a light truck airbag shock-absorbing seat further includes: After completing the design of the seat lying flat, the comfort and ease of operation of the designed seat were evaluated.

[0014] Secondly, a design device for folding down a light truck air-cushioned shock-absorbing seat is provided, which is used to realize the aforementioned design method for folding down a light truck air-cushioned shock-absorbing seat, comprising: The first unit is used to obtain the coordinates of the driver's R point, the coordinates of the driver's flat position, and the first preset height difference, wherein the first preset height difference is the height difference between the driver's R point and the driver's H point. The second unit is used to obtain the coordinates of the driver's H point based on the obtained driver's R point coordinates, the first preset height difference, and the driver's vision requirements. The driver's vision requirements include at least the forward vision area, the A-pillar binocular obstruction angle, the transparent area of ​​the windshield, and the obstruction by the steering wheel and the instrument panel. The third unit is used to obtain the driver's flattening trajectory and the passenger's flattening trajectory based on the driver's H point coordinates and the driver's flattening coordinates. The fourth unit is used to sequentially determine whether the driver's seat and passenger's seat folding trajectories interfere with the preset spatial clearance. If not, then complete the seat folding design; If so, then reacquire the coordinates of the driver's R point and the coordinates of the driver's horizontal position.

[0015] The beneficial effects of the technical solution provided in this application include: in the early stage of design, obtaining the R-point coordinates of the driver's seat and the first preset height difference, using the R-point coordinates of the driver's seat in the driving state as the reference point, and combining the first preset height difference, designing the H-point coordinates of the driver's seat in the parking state, thereby ensuring that the Z-direction height of the driver's seat when switching from the driving state to the parking state meets the preset requirements of the actual working conditions; and then designing the driver's seat angle adjustment mechanism based on the H-point coordinates of the driver's seat so that the driver's seat can meet the requirement of being laid flat, thereby obtaining the Z-direction height of the driver's seat when laid flat. Based on the Z-axis height of the driver's seat when flat, the target height for the passenger seat when flat is designed so that the passenger seat can form a plane with the driver's seat when flat, thus satisfying the flatness requirement after both the driver and passenger seats are flat. Based on the R-point coordinates of the driver's seat, the Z-axis height of the driver's seat when flat, and the Z-axis height of the passenger seat when flat, the seat mounting surface is obtained. Ensuring that there is no interference between the seat mounting surface and the surrounding environmental components, the seat flatness design can be completed. This solves the technical problem in related technologies where the H-point and R-point shift after the airbag-damped seat is flat, affecting the flatness of the driver and passenger seats. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A flowchart illustrating a design method for flattening a light truck airbag shock-absorbing seat, as provided in this application embodiment. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] This application provides a design method and device for flattening the air-cushioned seat of a light truck, which can solve the technical problem in the related art where the H point and R point are offset after the air-cushioned seat is flattened, affecting the flatness of the driver and passenger seats.

[0020] This application discloses a design method and device for a light truck air-suspension seat that is laid flat. In this application, to clarify the meaning of technical terms, the key reference points in vehicle seat design are first broadly interpreted. The R-point (Reference Point) broadly refers to the position of the intersection of the central axes of the human torso and thighs in the vehicle coordinate system when the seat is in its designed state, representing the standard sitting posture reference for the driver during normal driving. The H-point (Hip Point) broadly refers to the position of the intersection of the central axes of the human torso and thighs on the actual seat when a human model (H-point machine) is installed on the seat. In the technical solution of this application, the R-point is mainly used as the design point in the driving state, i.e., when the air-suspension system is in normal working inflation state, while the H-point is used in the parking state, especially when the seat is laid flat for rest. It should be specifically noted that for air-suspension seats, the driver's H-point referred to in this embodiment preferably specifically refers to the H-point in the state of complete air deflation or natural static reset. This is because when the vehicle is parked and the driver is preparing to rest, the vehicle's power is turned off, and the airbag suspension system may no longer maintain the inflation height used while driving, or the airbag may deflate to achieve a lower resting posture. If the design does not take into account the H-point in this state, the seat height after folding down will not match the expected height.

[0021] One method for designing a flattened air-suspension seat in a light truck includes the following steps: S1: Obtain the coordinates of the driver's R point, the coordinates of the driver's flat position, and the first preset height difference, wherein the first preset height difference is the Z-direction height difference between the driver's R point and the driver's H point; Specifically, in the early design phase, the preset parameters of the cab are obtained, including at least spatial parameters, ergonomic parameters, and airbag suspension travel parameters. Based on the spatial layout of the light truck cab, ergonomic requirements, and the travel parameters of the airbag-suspension seat, the R-point coordinates of the driver's seat are calculated. This is the R-point coordinate of the driver's seat in normal driving conditions, where the airbag suspension system is in normal inflation mode, supporting the driver's weight.

[0022] To ensure the driver's seat maintains consistent height before and after folding down, and to prevent excessive height differences between the seat and the driver's cab floor or passenger seat due to changes in airbag height, the Z-axis height difference between the driver's seat's R-point and H-point needs to be preset based on actual operating conditions; this is known as the first preset height difference. Typically, to ensure the flatness and comfort of the driver's seat after folding down, the first preset height difference is usually set to ±10mm.

[0023] S2: Based on the obtained driver's R point coordinates, the first preset height difference and the driver's vision requirements, obtain the driver's H point coordinates. The driver's vision requirements include at least the forward vision area, the A-pillar binocular obstruction angle, the transparent area of ​​the windshield, and the obstruction by the steering wheel and the dashboard. The driver's seat R-point coordinates are combined with the first preset height difference to initially obtain the driver's seat H-point coordinates. Then, the driver's seat H-point coordinates are verified based on the driver's visibility requirements. For example, it is ensured that the driver's forward visibility through the windshield's transparent area is unobstructed while driving, the A-pillar binocular obstruction angle meets regulatory requirements, and the steering wheel and dashboard do not obstruct key driving information. If the initially calculated driver's seat H-point coordinates do not meet the driver's visibility requirements, the process returns to step S1 to modify the driver's seat H-point coordinates. If the re-obtained driver's seat H-point coordinates within the first preset height adjustment range still do not meet the driver's visibility requirements, the cab preset parameters are modified, and the driver's seat R-point coordinates or the first preset height difference are redesigned until all visibility constraints are met, ensuring both seat flatness during parking and ergonomic compliance while driving.

[0024] S3: Based on the driver's H-point coordinates and the driver's flat coordinates, obtain the driver's flat trajectory and the passenger's flat trajectory; When obtaining the driver's seat's horizontal coordinates during the initial design phase, a flatness error between these coordinates and the vehicle's horizontal coordinate system is considered to be ≤3mm. In the specific design of the driver's seat angle adjustment mechanism, it is necessary to ensure that when rotating the driver's seat's H-point coordinates to the horizontal coordinates (i.e., when the driver's seat back is adjusted to a horizontal position), the mechanism can remain at an integer position to guarantee reliable locking. The design of the driver's seat angle adjustment mechanism should include at least the design of the driver's seat back's rotation center and the parameters of the adjuster.

[0025] After completing the design of the driver's seat angle adjustment mechanism, the target height of the passenger seat after its backrest is folded down is determined based on the Z-axis height of the driver's seat when the backrest is flat. To ensure rest comfort, a second preset height difference in the Z-axis height between the passenger seat and the driver's seat in the folded-down state needs to be pre-set. This second preset height difference is typically set to ≤5mm. If the second preset height difference exceeds 5mm, a noticeable step will appear at the joint between the driver and passenger seats, affecting rest comfort.

[0026] Based on the target flat position of the passenger seat, the flat position trajectory of the passenger seat is derived in reverse. Similarly, the rotation center of the passenger seat backrest is obtained, which is the installation position of the passenger seat angle adjustment mechanism. At the same time, the Z-axis height of the seat side wings is designed with a tolerance controlled within ±3mm to balance lateral support and ease of passage.

[0027] S4: Sequentially determine whether the driver's seat folding trajectory and the passenger seat folding trajectory interfere with the preset space clearance: If not, then complete the seat folding design; If so, then reacquire the coordinates of the driver's R point and the coordinates of the driver's horizontal position.

[0028] Specifically, the system obtains a preset spatial clearance, which is the reserved clearance between the driver's seat folding trajectory, the passenger seat folding trajectory, and the cab environmental components. These components include the cab floor, dashboard, steering wheel, and other parts. In this embodiment, the preset spatial clearance standard is a minimum vertical clearance of 20mm and a minimum horizontal clearance of 25mm. If the folding trajectory of the driver's or passenger seat conflicts with the preset spatial clearance, it is determined that interference has occurred with the cab environmental components. In this case, the system or designer needs to return to step S1, re-obtain the driver's seat R-point coordinates and driver's seat folding coordinates, and perform iterative optimization. If no interference occurs, the seat folding design is considered complete.

[0029] S5: Evaluate the comfort and ease of operation of the redesigned seat.

[0030] Specifically, after completing the geometric design, the comfort evaluation of the designed seat should include at least heel interference. In the 3D model, the heel coordinates and the preset heel gap (i.e., the contact point of the driver's heel) are obtained according to actual working conditions, and the distances between the driver's and passenger's seat folding trajectories and the heel coordinates are compared. If the distances between the driver's and passenger's seat folding trajectories and the heel coordinates are outside the preset heel gap range, it indicates that folding the seat flat will affect the driver's entry and exit from the vehicle or seat adjustment.

[0031] Furthermore, during the actual evaluation process, digital prototype motion simulation was used to verify the interference between the seat and surrounding components during the full range of motion adjustment and folding down. Digital human-machine simulation tools were used to conduct a comprehensive comfort evaluation, including subjective evaluation and objective measurements such as pressure distribution, human-machine posture parameters, vibration transmission characteristics, and foam mechanical properties.

[0032] Regarding ease of operation, in one embodiment of this application, the adjustment force is controlled within 3-8N, and the leveling operation force is ≤150N. Based on actual working conditions and regulatory requirements, CAE analysis is performed on the static strength of the seat back, the strength of the seat fixing points, the dynamic impact strength, and the strength of the leveling mechanism. Specifically, the static strength of the seat back must meet 530 N·m, the dynamic impact strength must meet 20g, and the strength of the leveling mechanism must meet 10,000 leveling and resetting cycles without failure. After the simulation evaluation is passed, a physical prototype is fabricated for actual testing. If the physical test does not meet the requirements, the design is returned to the corresponding design steps for optimization, forming a complete closed loop of design, simulation, and physical feedback.

[0033] Based on the above-disclosed design method for folding down a light truck air-cushioned seat, this application also discloses a design device for folding down a light truck air-cushioned seat, comprising: The first unit is used to obtain the coordinates of the driver's R point, the coordinates of the driver's flat position, and the first preset height difference, wherein the first preset height difference is the height difference between the driver's R point and the driver's H point. The second unit is used to obtain the coordinates of the driver's H point based on the obtained driver's R point coordinates, the first preset height difference, and the driver's vision requirements. The driver's vision requirements include at least the forward vision area, the A-pillar binocular obstruction angle, the transparent area of ​​the windshield, and the obstruction by the steering wheel and the instrument panel. The third unit is used to obtain the driver's flattening trajectory and the passenger's flattening trajectory based on the driver's H point coordinates and the driver's flattening coordinates. The fourth unit is used to sequentially determine whether the driver's seat and passenger's seat folding trajectories interfere with the preset spatial clearance. If not, then complete the seat folding design; If so, then reacquire the coordinates of the driver's R point and the coordinates of the driver's horizontal position.

[0034] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0035] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A design method for folding down the air-cushioned seat of a light truck, characterized in that, It includes the following steps: Obtain the coordinates of the driver's R point, the coordinates of the driver's flat position, and the first preset height difference, wherein the first preset height difference is the Z-axis height difference between the driver's R point and the driver's H point; Based on the obtained driver's R point coordinates, the first preset height difference, and the driver's vision requirements, the driver's H point coordinates are obtained. The driver's vision requirements include at least the forward vision area, the A-pillar binocular obstruction angle, the transparent area of ​​the windshield, and the obstruction by the steering wheel and dashboard. Based on the driver's H-point coordinates and the driver's flattening coordinates, obtain the driver's flattening trajectory and the passenger's flattening trajectory; The system sequentially determines whether the driver's seat and passenger's seat folding trajectories interfere with a preset spatial clearance. This preset spatial clearance is a pre-defined gap between the driver's seat and passenger's seat folding trajectories and the cab environment components. If not, then complete the seat folding design; If so, then reacquire the coordinates of the driver's R point and the coordinates of the driver's horizontal position.

2. The design method for folding down a light truck airbag shock-absorbing seat as described in claim 1, characterized in that: The process of obtaining the coordinates of the driver's side R point and the coordinates of the driver's side when the vehicle is level includes: Obtain preset parameters for the cab, which include at least spatial parameters, ergonomic parameters, and airbag shock absorption stroke parameters; Calculate the coordinates of the driver's R point based on the preset parameters of the driver's cab.

3. The design method for folding down a light truck airbag shock-absorbing seat as described in claim 1, characterized in that: The first preset height difference is set to ±10mm.

4. The design method for folding down a light truck airbag shock-absorbing seat as described in claim 1, characterized in that: The process of obtaining the driver's driving trajectory based on the driver's H-point coordinates and the driver's driving leveling coordinates includes: Design a driver's seat angle adjustment mechanism based on the driver's seat H-point coordinates and the driver's seat flat coordinates; The driver's H-point coordinate is rotated to the driver's flat coordinate using the driver's angle adjustment mechanism to obtain the driver's flat trajectory.

5. The design method for folding down a light truck airbag shock-absorbing seat as described in claim 4, characterized in that: When the driver's seat angle adjustment mechanism is rotated to the H-point coordinate of the driver's seat until the driver's seat is level, the driver's seat angle adjustment mechanism is adjusted to an integer position.

6. The design method for folding down a light truck airbag shock-absorbing seat as described in claim 1, characterized in that: The process of obtaining the passenger-side leveling trajectory based on the driver's H-point coordinates and the driver's leveling coordinates includes: Obtain the second preset height difference between the passenger seat and the driver seat in the Z-direction when the seats are folded down; Based on the driver's H-point coordinates, the driver's flat coordinates, and the second preset height difference, the passenger's flat coordinates are obtained.

7. The design method for folding down a light truck airbag shock-absorbing seat as described in claim 6, characterized in that: The second preset height difference is set to 5mm.

8. The design method for folding down a light truck airbag shock-absorbing seat as described in claim 1, characterized in that: The cab environment components include at least the cab floor, dashboard, and steering wheel.

9. A design method for folding down a light truck airbag shock-absorbing seat as described in any one of claims 1-8, characterized in that, It also includes: After completing the design of the seat lying flat, the comfort and ease of operation of the designed seat were evaluated.

10. A design device for folding down the air-cushioned seat of a light truck, characterized in that, It is used to implement the design method for folding down a light truck airbag shock-absorbing seat as described in any one of claims 1-9, and includes: The first unit is used to obtain the coordinates of the driver's R point, the coordinates of the driver's flat position, and the first preset height difference, wherein the first preset height difference is the height difference between the driver's R point and the driver's H point. The second unit is used to obtain the coordinates of the driver's H point based on the obtained driver's R point coordinates, the first preset height difference, and the driver's vision requirements. The driver's vision requirements include at least the forward vision area, the A-pillar binocular obstruction angle, the transparent area of ​​the windshield, and the obstruction by the steering wheel and the instrument panel. The third unit is used to obtain the driver's flattening trajectory and the passenger's flattening trajectory based on the driver's H point coordinates and the driver's flattening coordinates. The fourth unit is used to sequentially determine whether the driver's seat and passenger's seat folding trajectories interfere with the preset spatial clearance. If not, then complete the seat folding design; If so, then reacquire the coordinates of the driver's R point and the coordinates of the driver's horizontal position.

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