Design method for a fast-lying vehicle seat and vehicle seat

Abstract

The present invention discloses a design method for a fast-retracting vehicle seat and a vehicle seat. The method includes obtaining the vehicle's Z-direction intrusion amount when the vehicle is in a Z-direction space reduction condition and setting a Z-direction avoidance distance for the occupant's head; obtaining the vehicle seat's rotation data based on the vehicle's Z-direction intrusion amount, intrusion duration, and the Z-direction avoidance distance for the occupant's head; obtaining the vehicle seat's torsional driving force based on the vehicle seat's rotation data, the total mass of the occupant and vehicle seat, and the position of the vehicle seat's torsional driving force; and selecting a torsional driving component that meets the requirements based on the vehicle seat's torsional driving force, and installing the component on the vehicle seat based on the position of the vehicle seat's torsional driving force. The seat's fast-retracting function allows the occupant's upper body to enter a safe area in the shortest possible time, thereby increasing the occupant's chance of survival and reducing the probability of injury.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle design, and in particular to a design method for a fast-lying vehicle seat and the vehicle seat. Background Art

[0002] There are many reasons why cars are crushed by overhead vehicles (large trucks, utility poles, etc.) and rear-ended into the bottom of trucks, including rear-end collisions, operational errors, and fatigue driving. When these accidents occur, they will seriously affect the personal safety of vehicle occupants.

[0003] Due to the limitations of the occupant survival space design, when the vehicle is subjected to a large mass top pressure or the vehicle drills into the back of a truck, the survival space for the occupants in the vehicle is smaller in the Z direction.

[0004] Therefore, there is an urgent need for a seat design method that can enable drivers and passengers to quickly enter a smaller living space in the Z direction when the vehicle is subjected to top pressure or enters the bottom of a truck, thereby ensuring the safety of the drivers and passengers. Based on this method, a quick-reclining seat suitable for any vehicle model can be designed. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and provide a design method and vehicle seat that can control the vehicle seat to quickly lie down when the vehicle is subjected to Z-direction space reduction conditions such as being pressed by a large mass or drilling into the bottom of a truck, while driving the occupants to quickly enter the survival space along with the seat, reducing the risk of occupant injury and protecting the safety of the occupants.

[0006] To achieve this objective, the present invention provides a method for designing a fast-retracting vehicle seat: obtaining the vehicle's Z-direction intrusion amount when the vehicle is in a Z-direction space reduction condition and setting the Z-direction avoidance distance for the occupant's head; obtaining the vehicle seat's rotational data based on the vehicle's Z-direction intrusion amount, intrusion duration, and the Z-direction avoidance distance for the occupant's head; obtaining the vehicle seat's torsional driving force based on the vehicle seat's rotational data, the total mass information of the occupant and vehicle seat, and the position of the vehicle seat's torsional driving force; selecting a torsional driving component that meets the requirements based on the vehicle seat's torsional driving force, and installing it on the vehicle seat based on the position of the vehicle seat's torsional driving force. The intrusion duration can be obtained in the first step, or obtained and incorporated in the second step. When simulating a vehicle being pressed against or entering the rear of a truck, with the roof collapsing in the Z direction, the vehicle's Z-direction intrusion amount and intrusion duration can be simultaneously obtained.

[0007] Furthermore, the method for obtaining the vehicle's Z-direction intrusion amount and intrusion duration when the vehicle is in a Z-direction space reduction condition includes: setting the mass of the heavy object pressing the top vehicle or the speed of the vehicle when it rear-ends, and simulating to obtain the vehicle's Z-direction intrusion amount and intrusion duration.

[0008] Furthermore, the method for setting the Z-direction avoidance distance of the occupant's head includes: setting the Z-direction avoidance distance of the occupant's head to be greater than the Z-direction intrusion amount of the vehicle.

[0009] Furthermore, the method for obtaining the rotation data of the vehicle seat includes: setting the seat avoidance angle, calculating the seat angle arc length, the time taken for the vehicle seat to rotate the seat avoidance angle, the seat rotation angular velocity and the seat rotation angular acceleration.

[0010] Furthermore, the method for obtaining the time taken for the vehicle seat to rotate to avoid the seat angle includes: obtaining the ignition duration of the vehicle ACU; the difference between the intrusion duration and the ignition duration of the vehicle ACU is the time taken for the vehicle seat to rotate to avoid the seat angle.

[0011] Furthermore, the method for obtaining the total mass information of the occupant and the vehicle seat includes: setting the total mass of the occupant's upper body and the seat back, and the distance from the center of mass of the occupant's upper body and the seat back assembly to the seat back rotation point.

[0012] Furthermore, the method for obtaining the position of action of the torsional driving force of the vehicle seat includes: setting the distance between the torsional driving force and the rotation point of the seat back.

[0013] Furthermore, the method for obtaining the torsional driving force of the vehicle seat based on the rotation data of the vehicle seat, the total mass information of the occupant and the vehicle seat, and the position of the torsional driving force of the vehicle seat includes: performing data substitution based on the rotation data of the vehicle seat, the total mass of the occupant's upper body and the seat back, the distance from the center of mass of the occupant's upper body and the seat back assembly to the seat back rotation point, and the distance between the torsional driving force and the seat back rotation point to obtain the range of the torsional driving force.

[0014] Furthermore, a vehicle seat designed based on the above-mentioned method for designing a fast-lying vehicle seat includes a seat base frame and a seat back frame, and an angle adjustment locking mechanism is connected between the seat base frame and the seat back frame, which can drive the seat back frame to rotate, lock the seat back frame after rotation, and make the lock fail when the vehicle is in a Z-direction space reduction working condition, and a torsional drive component is connected between the seat base frame and the seat back frame for driving the seat back frame to lie down.

[0015] Furthermore, the angle adjustment locking mechanism includes a recliner fixed to the bottom of the seat back frame and having gear teeth, an angle adjustment locking gear arranged in the seat base frame and meshing with the gear teeth of the recliner, and a locking pin with one end coaxially inserted into the angle adjustment locking gear, and the other end of the locking pin is connected to an igniter for driving it to disengage from the angle adjustment locking gear.

[0016] The beneficial effects of the present invention are: based on the emergency working condition of reduced Z-direction space of the vehicle, the present invention designs a vehicle seat design method with a quick-lying-down function. Through this method, quick-lying-down seats that meet the needs of vehicles of different sizes and models can be quickly designed. Through the quick-lying-down function of the seat, the upper body of the occupant can enter the safe area in the shortest time, thereby increasing the occupant's chance of survival and reducing the probability of injury. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the vehicle in the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of a vehicle in the present invention being pressed by a heavy object;

[0019] Figure 3 This is a schematic diagram of the structure of a vehicle drilling into the bottom of a truck in the present invention;

[0020] Figure 4 This is a schematic diagram of the vehicle seat design in the present invention;

[0021] Figure 5 A perspective view of the frame of the vehicle seat of the present invention;

[0022] Figure 6 A perspective view of the connection between the seat base frame and the seat back frame of the present invention;

[0023] Figure 7 A perspective view of the structure of the connection between the locking pin and the angle adjustment locking gear in the present invention;

[0024] Figure 8 A perspective view of the structure in which the locking pin and the angle adjustment locking gear are disengaged in the present invention;

[0025] Figure 9 This is a schematic structural diagram of the vehicle seat before lying down in the present invention;

[0026] Figure 10 This is a schematic diagram of the structure of the vehicle seat after lying down in the present invention;

[0027] Among them, 1 is the seat base frame, 2 is the seat back frame, 3 is the recliner, 4 is the angle adjustment locking gear, 5 is the locking pin, 6 is the ignition, 7 is the top pressure sensor, 8 is the AEB camera, 9 is the ACU, 10 is the front collision sensor, 11 is the side collision sensor, 12 is the vehicle seat, 13 is the heavy object, 14 is the truck, 15 is the seat belt with pre-tensioning function, 16 is the rear cross pipe of the seat pan, 17 is the torsion bar spring, and 18 is the torsion bar spring bracket. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0029] Definition of noun:

[0030] Z-space reduction conditions: The vehicle encounters pressure from heavy trucks, utility poles, or the back of a truck, which reduces the occupants' Z-space.

[0031] Vehicle Z-direction intrusion: The distance the roof collapses in the Z direction when the vehicle's Z-direction space is reduced.

[0032] Intrusion duration: The duration from the start to the end of the vehicle's Z-direction space reduction.

[0033] Z-direction avoidance distance of the occupant's head: To prevent the vehicle roof from collapsing and contacting the occupant's head, the rotation of the vehicle seat drives the occupant's upper body to rotate around the seatback rotation point, and the occupant's head moves in the Z direction.

[0034] Torsional drive components: such as torsion springs, gear sets, etc., which can drive the seat back to lie down quickly.

[0035] Seat avoidance angle: the angle at which the seat backrest rotates around the rotation point when the seat is quickly reclined.

[0036] Seat corner arc length: The arc length of the seat back apex movement during the process of the seat back rotating around the rotation point to avoid the seat corner.

[0037] Vehicle ACU ignition duration: The time period between when the vehicle determines that it is currently in the Z-direction space reduction condition and when the vehicle ACU ignites.

[0038] The design method of the fast-lying vehicle seat designed in the present invention includes: obtaining the Z-direction intrusion amount and intrusion duration of the vehicle when the vehicle is in a Z-direction space reduction working condition, and setting the Z-direction avoidance distance of the occupant's head; obtaining the rotation data of the vehicle seat according to the Z-direction intrusion amount, intrusion duration and the Z-direction avoidance distance of the occupant's head; setting the total mass information of the occupant and the vehicle seat and the torsional driving force action position of the vehicle seat, and obtaining the torsional driving force of the vehicle seat according to the rotation data of the vehicle seat, the total mass information of the occupant and the vehicle seat and the torsional driving force action position of the vehicle seat; selecting a torsional driving component that meets the requirements according to the torsional driving force of the vehicle seat, and installing it on the vehicle seat according to the torsional driving force action position of the vehicle seat.

[0039] In one embodiment of the present invention, the Z-direction intrusion amount and duration of a vehicle in a Z-direction space reduction condition are determined by simulating the vehicle's Z-direction intrusion amount and duration using a pre-set weight or vehicle speed during a rear-end collision. The Z-direction avoidance distance for an occupant's head is set such that the Z-direction avoidance distance is greater than the vehicle's Z-direction intrusion amount.

[0040] In one embodiment of the present invention, vehicle seat rotation data includes a seat avoidance angle, a seat rotation arc length, a duration of the vehicle seat rotation to avoid the angle, a seat rotation angular velocity, and a seat rotation angular acceleration. The duration of the vehicle seat rotation to avoid the angle is obtained by obtaining the ignition duration of the vehicle's automatic control unit (ACU). The difference between the intrusion duration and the ignition duration of the ACU is the duration of the vehicle seat rotation to avoid the angle.

[0041] In one embodiment of the present invention, setting the total mass information of the occupant and the vehicle seat includes setting the total mass of the occupant's upper body and the seat back, and the distance from the center of mass of the occupant's upper body and the seat back assembly to the seat back rotation point. Setting the position of action of the torsional driving force of the vehicle seat includes setting the distance between the torsional driving force and the seat back rotation point. A method for obtaining the torsional driving force of the vehicle seat based on the rotation data of the vehicle seat, the total mass information of the occupant and the vehicle seat, and the position of action of the torsional driving force of the vehicle seat is as follows: performing data substitution based on the rotation data of the vehicle seat, the total mass of the occupant's upper body and the seat back, the distance from the center of mass of the occupant's upper body and the seat back assembly to the seat back rotation point, and the distance between the torsional driving force and the seat back rotation point to obtain the range of the torsional driving force.

[0042] like Figure 1 FIG10 shows a design method for a fast-reclining vehicle seat according to the present invention and a preferred embodiment of the vehicle seat designed according to the design method.

[0043] The design method of the fast-reclining vehicle seat of the present invention is designed based on the collision sensing structure of the vehicle. Specifically, the collision sensing system of the vehicle is mainly constructed as follows: Figure 1 As shown, it includes collision sensors (front collision sensor 10 and side collision sensor 11 ), AEB camera 8 , ACU 9 , and vehicle seat 12 .

[0044] The AEB camera 8 identifies the preceding vehicle and determines whether its rear end is higher than the vehicle's cabin roof. The ACU9's triggering function is calibrated for conditions such as heavy trucks, utility poles, and other vehicles pressing against or digging into the rear of a truck, as well as misuse conditions such as vehicle rollover. The ACU9 can now identify these conditions. When the ACU9 identifies conditions resulting in reduced Z-direction clearance, such as heavy trucks, utility poles, and other vehicles pressing against or digging into the rear of a truck, it triggers the vehicle seat 12's rapid reclining function.

[0045] The following describes a design method for the vehicle seat 12 by taking the vehicle encountering a top crushing condition and a rear-end collision into the rear of a truck as examples.

[0046] Figure 2 As shown, a heavy object 13 with a mass of M is pressed against the roof at a speed of v. The roof bends and deforms under the force, and the top pressure sensor 7 transmits the acceleration signal to the ACU9. At the same time, the acceleration signals of the relevant side impact sensor 11 and the internal sensor of the ACU9 are weak. The ACU9 determines through the algorithm calibrated in advance that the vehicle did not roll over at this time, but encountered a large mass top pressure condition, so it triggers the rapid reclining function of the vehicle seat.

[0047] Figure 3 The illustration shows a vehicle undermining the rear of a truck. The vehicle impacts an object of mass M at a speed v, located above the hood. At this point, the AEB camera 8 detects the height of mass M and determines whether it is a jamming condition. Simultaneously, the front collision sensor 10 impacts the truck's lower crash barrier, generating acceleration. This acceleration signal is transmitted to the ACU9. The ACU9's calibrated algorithm, combined with the AEB camera 8's determination of mass M's height, determines that the vehicle has undermined the truck, triggering the vehicle seat's rapid reclining function.

[0048] like Figure 4 As shown in the figure, a project sets a weight of 10 tons 13 to press the vehicle to a Z distance of Z1. In addition, the vehicle penetrates the rear of the truck at a speed of 50 km / h, and the Z distance of the truck is also Z1. Through simulation, it is confirmed that under two working conditions, the intrusion time is t1. The upper part of the dummy needs to quickly enter the non-intrusion zone, and the Z movement of the dummy's head center of mass is set to Z2.

[0049] According to the design requirements, after time t1, Z2>Z1, which is formula 1.

[0050] The seat avoidance angle is α, where S is the distance from the center of mass of the dummy's head to the seat back rotation point before it moves. Formula 2 is:

[0051]

[0052] Transform Formula 2 to obtain Formula 3:

[0053]

[0054] Since the seat avoidance angle is α, the resulting seat angle arc length C is expressed as formula 4:

[0055]

[0056] The vehicle ACU ignition time is t, and the time for the seat to rotate to avoid the angle α is t2, then t2 = t1 - t, which is Formula 5, that is, the seat's rapid reclining function does not affect the normal deployment of the airbag.

[0057] Seat rotation angular velocity This is Formula 6.

[0058] Seat rotation angular acceleration This is Formula 7.

[0059] Moment of inertia I, where m is the total mass of the occupant's upper body and seat back, and r is the distance from the center of mass of the occupant's upper body and seat back assembly to the seat back rotation point. I = m·r 2 , which is Formula 8.

[0060] The force F of the torsional drive member in the vehicle seat 12 drives the seat back to lie down quickly. L is the distance between the force F and the rotation point of the seat back. F·L=a·I, which is Formula 9.

[0061] Substituting the above formulas 2, 4, 5, 6, 7, and 8 into formula 9, we get formula 10:

[0062]

[0063] Substituting Equation 10 into Equation 3, we obtain Equation 11:

[0064]

[0065] Substituting Formula 11 into Formula 2, we obtain Formula 12:

[0066]

[0067] Transform Formula 12 to obtain Formula 13:

[0068]

[0069] Therefore, the torsional force generated by the torsional drive must meet the requirements of Formula 13 in order to meet the requirements for the occupants to enter the Z-direction survival space.

[0070] For different vehicles, the parameter values ​​in the above formula 13 can be replaced to ensure that the vehicle seat 12 is adapted to vehicles of different sizes and models.

[0071] Based on the above-mentioned design method of the vehicle seat 12, the structure of the vehicle seat 12 with a quick reclining function designed by the present invention is as follows: Figure 5 As shown, it includes a seat base frame 1 and a seat back frame 2 with a pre-tensioning function seat belt 15 (tightened immediately after a vehicle collision, this is prior art and will not be described in detail in the present invention).

[0072] like Figure 6 As shown in FIG8 , when the ACU9 triggers the seat's rapid reclining function, the quick-detaching recliner comes into play. After the quick-detaching recliner is activated, the seat back quickly reclines, and the seat belt 15 with a pre-tensioning function can quickly bring the occupant along with the seat back to quickly recline.

[0073] The structure of the quick-release angle adjuster is as follows: Figure 7 As shown in FIG8 , the control process of the seat rapid reclining function is as follows: when the ACU 9 triggers the seat rapid reclining function, the igniter 6 ignites, separating the locking pin 5 from the angle adjustment locking gear 4, and the angle adjustment locking gear 4 from the seat frame. After the angle adjustment locking gear 4 is separated from the seat frame, the recliner 3 is not locked, and under the action of the torsion bar spring 17, the seat back will quickly recline. Figure 9 The state is converted to Figure 10 status.

[0074] The present invention provides a fast-lying vehicle seat system that protects the safety of passengers. When the vehicle seat 12 is pressed by a heavy truck, a utility pole, or the like, or penetrates into the rear of a truck, affecting the Z-direction passenger survival space, the vehicle seat 12 can be controlled to lie down quickly, while driving the passengers to lie down together with the seat, ensuring that the passengers quickly enter the survival space, reducing the risk of injury to the passengers, ensuring the safety of the passengers, and improving the survival rate of the passengers.

[0075] In the system structure of the vehicle seat 12 described above, the collision sensor placement is not limited to the positions listed herein and may also be other locations that can be calibrated for relevant operating conditions. The quick release of the recliner is not limited to locking with a locking pin; the recliner 3 may also be unlocked by moving the reclining lock gear 4 to another position. The seat backrest's rapid reclining is not limited to being achieved via the torsion bar spring 17; it may also be achieved through structures such as reverse gear rotation. Operating conditions are not limited to pressure from heavy trucks, utility poles, and other objects, as well as undermining the rear of a truck; other conditions that reduce the occupant's Z-axis survival space may also be considered.

[0076] In summary, the present invention designs a vehicle seat design method with a quick-folding function based on the emergency working condition of reduced Z-direction space of the vehicle. Through this method, quick-folding seats that meet the needs of vehicles of different sizes and models can be quickly designed. The quick-folding function of the seat can enable the upper body of the occupant to enter the safe area in the shortest time, thereby increasing the occupant's chance of survival and reducing the probability of injury.

[0077] It should be noted here that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims. When using "including", "having" and "comprising" described in this specification, there may also be another part or other parts, and the terms used may generally be singular but may also represent plural forms. Finally, it should be pointed out that the above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there may be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be deemed to fall within the scope of protection of the present invention.

Claims

1. A method for designing a fast-reclining vehicle seat, characterized by: Obtain the vehicle's Z-direction intrusion amount when the vehicle is in the Z-direction space reduction working condition and set the Z-direction avoidance distance of the occupant's head; Obtaining vehicle seat rotation data based on the vehicle's Z-direction intrusion amount, intrusion duration, and the Z-direction avoidance distance of the occupant's head; obtaining a torsional driving force of the vehicle seat based on the rotation data of the vehicle seat, the total mass information of the occupant and the vehicle seat, and the position where the torsional driving force acts on the vehicle seat; Select a torsional driving member that meets the requirements according to the torsional driving force of the vehicle seat, and install it on the vehicle seat according to the position where the torsional driving force of the vehicle seat acts; The method for obtaining the total mass information of the occupant and the vehicle seat includes: setting the total mass of the occupant's upper body and the seat back, and the distance from the center of mass of the occupant's upper body and the seat back assembly to the seat back rotation point; The method for obtaining the position of action of the torsional driving force of the vehicle seat comprises: setting the distance between the torsional driving force and the rotation point of the seat back; The method for obtaining the torsional driving force of a vehicle seat based on the rotation data of the vehicle seat, the total mass information of the occupant and the vehicle seat, and the position of the torsional driving force of the vehicle seat includes: performing data substitution based on the rotation data of the vehicle seat, the total mass of the occupant's upper body and the seat back, the distance from the center of mass of the occupant's upper body and the seat back assembly to the seat back rotation point, and the distance between the torsional driving force and the seat back rotation point to obtain the range of the torsional driving force.

2. The method for designing a fast-reclining vehicle seat according to claim 1, wherein: The method for obtaining the vehicle Z-direction intrusion amount and intrusion duration when the vehicle is in a Z-direction space reduction working condition includes: setting the mass of the heavy object pressing the top vehicle or the speed of the vehicle when rear-ending, and simulating to obtain the vehicle Z-direction intrusion amount and intrusion duration.

3. The method for designing a fast-reclining vehicle seat according to claim 1 or 2, characterized in that: The method for setting the Z-direction avoidance distance of the occupant's head includes setting the Z-direction avoidance distance of the occupant's head to be greater than the Z-direction intrusion amount of the vehicle.

4. The method for designing a fast-reclining vehicle seat according to claim 1, wherein: The method for obtaining the rotation data of the vehicle seat includes: setting a seat avoidance angle, calculating the seat angle arc length, the time taken for the vehicle seat to rotate the seat avoidance angle, the seat rotation angular velocity and the seat rotation angular acceleration.

5. The method for designing a fast-reclining vehicle seat according to claim 4, characterized in that: The method for obtaining the time taken for the vehicle seat to rotate to avoid a turning angle includes: obtaining the ignition duration of the vehicle ACU; the difference between the intrusion duration and the ignition duration of the vehicle ACU is the time taken for the vehicle seat to rotate to avoid a turning angle.

6. A vehicle seat designed based on the design method of a fast-reclining vehicle seat according to any one of claims 1 to 5, comprising a seat base frame (1) and a seat back frame (2), characterized in that: An angle adjustment locking mechanism is connected between the seat base frame (1) and the seat back frame (2), which can drive the seat back frame (2) to rotate, lock the seat back frame (2) after rotation, and disable the locking when the vehicle is in a Z-direction space reduction working condition. A torsion drive component is connected between the seat base frame (1) and the seat back frame (2) for driving the seat back frame (2) to lie down.

7. The vehicle seat according to claim 6, wherein: The angle adjustment locking mechanism comprises an angle adjuster (3) fixed to the bottom of the seat back frame (2) and having gear teeth, an angle adjustment locking gear (4) arranged in the seat base frame (1) and meshing with the gear teeth of the angle adjuster (3), and a locking pin (5) with one end coaxially inserted into the angle adjustment locking gear (4), and the other end of the locking pin (5) is connected to an igniter (6) for driving it to disengage from the angle adjustment locking gear (4).

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