Seat back self-adapting adjusting device and development method thereof

Abstract

The application provides a seat back self-adaptive adjusting device and a development method thereof. The development method comprises the following steps: testing the pressure distribution of a conventional seat and a reference seat respectively; arranging at least two air bags in the back of the conventional seat, determining the position of the air bag distribution according to the pressure distribution of the reference seat, adjusting the air pressure of each air bag, analyzing the relationship between the back comfort and the air pressure of the air bag through the relationship between the characteristic parameters and the air pressure of the air bag, and obtaining a comfortable air pressure target value; adjusting the air pressure of each air bag according to the pressure distribution of the reference seat to obtain the comfortable air pressure value of each air bag; and adjusting the back angle to obtain the corresponding comfortable air pressure value of each air bag under each back angle. The application starts from two dimensions of the fitting degree and the stress distribution of the self-adaptive adjusting seat back, actively reaches the comfortable state of the passenger in the sitting posture by identifying the back angle and adjusting the air bag, and meets the demand of the automobile consumers for the electrification and the intelligentization of the cabin.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile seats, in particular to a seat back self-adaptive adjusting device and a development method thereof. BACKGROUND

[0002] The seat is the main part of the car interior, and its comfort is an important indicator for consumers to choose a car. The seat configuration of vehicles of different consumer grades is often from manual to electric, from backrest adjustment, cushion front and rear adjustment, height adjustment, inclination angle adjustment to multi-directional adjustment of the waist support, the main purpose of which is to facilitate the passenger to find a comfortable sitting posture.

[0003] In practical applications, there are two technical solutions for improving the comfort of the seat by adjusting the air bag pressure in the seat backrest:

[0004] 1. Add a passenger fit detection module and a comfort adjustment module to the seat, the fit is detected by the change of the capacitance inside the backrest, and the comfort is adjusted by adjusting the air pressure of each air bag one by one after the capacitance is compared with the threshold value. For example, the adaptive seat comfort system and adjustment method based on the fit between the passenger and the seat disclosed in Chinese patent CN 112092686 A.

[0005] 2. Add a pressure sensor to the seat cushion, determine the passenger's weight information according to the pressure value, and adjust the air bag to the corresponding comfortable air pressure value under the weight information. For example, the adaptive adjustment method of the automobile seat disclosed in Chinese patent CN 111559290 A.

[0006] The evaluation of comfort has human differences, but when optimizing the comfort of the seat, it needs to have a reasonable optimization direction. The above two solutions do not give a clear optimization goal. Specifically, the first solution sets multiple threshold values as the judgment conditions for the inflation and deflation of each air bag, and the given threshold values are directly related to the comfort of the seat, but it does not mention the given standard of the threshold value, and it cannot be determined whether the backrest adjustment is comfortable within the threshold range. The second solution proposes a method of obtaining the corresponding relationship between the weight information and the air bag pressure through a data set, but it does not consider the supporting effect of the seat backrest on the human body when judging the weight through the seat cushion, and it uses the pressure information collected by the seat cushion to adjust the air pressure of the backrest, which is an indirect adjustment method with large errors. And the pressure distribution of the torso on the seat is different at different backrest angles, but both solutions do not mention the influence of the backrest angle on the comfort of the seat.

[0007] The technical solution of adjusting the air pressure of the built-in air bag in the seat to achieve the massage effect has been popularized, and some models arrange air bags on the A surface of the seat and increase the number of air bags to obtain more obvious adjustment effect. For example, Figure 1As shown. Among them, 11 is the cutting foam, 12 is the ten-point massage air bag, 13 is the backrest foam, 14 is the waist support, control valve and air pump. However, there is no reasonable optimization direction for the development of backrest comfort in the technical scheme. SUMMARY

[0008] In view of the above problems, the present application develops a self-adaptive seat with high comfort, fast response and good applicability from two dimensions of self-adaptive adjustment of the fitting degree and stress distribution of the seat backrest, and provides a development method of the self-adaptive seat. The present application actively achieves the comfort state of the occupant in the sitting posture by identifying the backrest angle and adjusting the air bag to the comfortable air pressure value, while meeting the demand of the automobile consumers for the electrification and intelligentization of the cabin.

[0009] The present application provides a development method of a seat backrest self-adaptive adjustment device, and the flow of the development method comprises:

[0010] Step S1, test the pressure distribution of the conventional seat and the reference seat respectively;

[0011] Step S2, set at least two air bags in the backrest of the conventional seat, determine the position of the air bag distribution according to the pressure distribution of the reference seat, adjust the air pressure of each air bag, analyze the relationship between the backrest comfort and the air pressure of the air bag through the relationship between the characteristic parameters and the air pressure of the air bag, and obtain the comfortable air pressure target value;

[0012] Step S3, adjust the air pressure of each air bag according to the pressure distribution of the reference seat to obtain the comfortable air pressure value of each air bag; and

[0013] Step S4, adjust the backrest angle to obtain the corresponding comfortable air pressure value of each air bag under each backrest angle.

[0014] In one embodiment, in the step S1, the reference seat is selected as a memory cotton seat.

[0015] In one embodiment, in the step S1, the method for testing the pressure distribution is specifically: laying pressure sensors on the surface of the seat, placing a dummy, and testing the pressure distribution of the backrest at multiple backrest angles.

[0016] In one embodiment, the characteristic parameters in the step S2 include the total pressure of the backrest, the number of measurement points with pressure greater than the threshold value, and the contact area.

[0017] In one embodiment, in the step S2, the air bag can stably adjust the air pressure, and the air pressure of each air bag can be adjusted individually.

[0018] In one embodiment, the step S2 further comprises: applying air pressure to each air bag, analyzing the relationship between the total pressure of the backrest and the air pressure of the air bag, fitting to obtain the linear relationship between the air pressure of the air bag and the total pressure of the backrest, and adjusting the air pressure of the air bag to simulate the change of the backrest pressure according to the linear relationship.

[0019] In one embodiment, the step S3 specifically comprises: according to the position of the air bag in the pressure distribution map, corresponding partition is carried out in the pressure distribution map, the air pressure of the air bag is adjusted until the pressure value of each area in the conventional seat backrest is equal to the pressure value of the corresponding area in the reference seat backrest, and the total pressure value of the conventional seat backrest is equal to the total pressure value of the reference seat backrest, and the comfortable air pressure value of each air bag is obtained.

[0020] In one embodiment, the step S4 specifically comprises: adjusting to a backrest angle to obtain the comfortable air pressure value of each air bag at the backrest angle.

[0021] The backrest angle is adjusted multiple times to obtain the corresponding comfortable air pressure value of each air bag at multiple backrest angles.

[0022] In one embodiment, the step S4 specifically further comprises: obtaining the comfortable air pressure value of each air bag at each backrest angle by fitting.

[0023] The application also provides a seat backrest self-adaptive adjusting device developed by the development method of the seat backrest self-adaptive adjusting device, which is installed on a seat, the seat is provided with a backrest and an angle adjuster, the backrest of the seat is provided with air bags, and the adjusting device comprises a detection module and a control module.

[0024] The application has the following beneficial effects:

[0025] 1. The development method of the seat backrest self-adaptive adjusting device is widely applicable and is a systematic development solution for the comfort of conventional seats.

[0026] 2. The development method of the seat backrest self-adaptive adjusting device has low cost, low dependence on the computing power of the processor and the accuracy and speed of the air pressure execution mechanism, and the existing conventional seat hardware basically meets the requirements, and only software development is needed, so that the method is easy to implement.

[0027] 3、The seat back self-adaptive adjusting device development method of the present application has a clear optimization target, and considers the influence of the backrest angle on the seat comfort, and the seat back self-adaptive adjusting device developed by the method can read the current passenger adjusted backrest angle, and automatically adjusts to the gas bag pressure value corresponding to the backrest angle, so that the passenger only needs to adjust the backrest angle to obtain comfortable riding feeling. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Prior art schematic diagram of installing gas bag on backrest A surface;

[0029] Figure 2 Flow chart of the seat back self-adaptive adjusting device development method of the embodiment of the present application;

[0030] Figure 3 Schematic diagram of pressure distribution of the memory cotton seat and the conventional seat of the embodiment of the present application;

[0031] Figure 4 Schematic diagram of the conventional seat gas bag arrangement mode of the embodiment of the present application;

[0032] Figure 5 Pressure distribution diagram of changing the gas bag pressure;

[0033] Figure 6a Schematic diagram of the relationship between the backrest total pressure and the gas bag pressure;

[0034] Figure 6b Schematic diagram of the relationship between the number of measurement points with pressure greater than 0.5 N and the gas bag pressure;

[0035] Figure 6c Schematic diagram of the relationship between the contact area and the gas bag pressure;

[0036] Figure 7a Schematic diagram of the relationship between the gas bag 1&2 pressure and the backrest total pressure of the embodiment of the present application;

[0037] Figure 7b Schematic diagram of the relationship between the gas bag 3&4 pressure and the backrest total pressure of the embodiment of the present application;

[0038] Figure 7c Schematic diagram of the relationship between the gas bag 5 pressure and the backrest total pressure of the embodiment of the present application;

[0039] Figure 7d Schematic diagram of the relationship between the gas bag 6 pressure and the backrest total pressure of the embodiment of the present application;

[0040] Figure 7e Schematic diagram of the relationship between the gas bag 7 pressure and the backrest total pressure of the embodiment of the present application; and

[0041] Figure 8An algorithm schematic diagram for acquiring the comfortable air pressure value in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0043] The present application proposes a development method of a seat back self-adaptive adjusting device, and a flow chart is shown in Figure 2 , which specifically comprises:

[0044] In step S1, the pressure distribution of the conventional seat and the reference seat is respectively tested. The method of the pressure distribution test is specifically as follows: a pressure sensor is laid on the surface of the seat, a dummy is placed, and the pressure distribution of the backrest under different backrest angles is tested.

[0045] The memory cotton material is soft, has good human body fitting property, uniform stress distribution and large contact area, and can feedback the pressure characteristics of the human body in the comfortable state, so that the pressure distribution generated by the human body on the seat in the more comfortable state can be found through the memory cotton material. In the present embodiment, the reference seat is selected to be a memory cotton seat. A pressure sensor is laid on the surface of the reference seat, a 50% dummy is placed, the pressure distribution when the backrest angle is 0° / 10° / 20° is measured respectively (the selected seat has a backrest angle of 16.2° at the design position), and the pressure distribution of the conventional seat is tested in the same way as a control, and a pressure distribution schematic diagram is shown in Figure 3 (the minimum pressure measurement unit: 1cm*1cm, the display pressure range is 0.1-0.5N / cm 2 ). Figure 3 The pressure distribution diagram shown in the figure is an interface directly output by a computer after the pressure distribution is tested by an instrument, and the effect can be most clearly expressed. Among them, Figure 3 (a-c) are respectively the pressure distribution of the reference seat when the backrest angle is 0° / 10° / 20°, Figure 3 (d-f) are respectively the pressure distribution of the conventional seat when the backrest angle is 0° / 10° / 20°. It can be seen that the pressure distribution of the reference seat is more uniform and has a larger contact area. It is proved that the pressure distribution generated by the human body on the seat in the more comfortable state can be found through the memory cotton material.

[0046] In step S2, at least two air bags are arranged in the backrest of the conventional seat, the positions of the air bag distribution are determined according to the pressure distribution range of the reference seat, the air pressure of each air bag is adjusted, and the relationship between the backrest comfort and the air bag air pressure is analyzed through the relationship between the characteristic parameters and the air bag air pressure.

[0047] The characteristic parameters of backrest comfort include total backrest pressure, the number of measuring points with pressure greater than a threshold value, and contact area. The set air bags can stably adjust air pressure, and the air pressure of each air bag can be adjusted individually. Meanwhile, air pressure is applied to each air bag, and the relationship between total backrest pressure and air bag air pressure is analyzed, and a linear relationship between air bag air pressure and total backrest pressure is obtained by fitting. According to the linear relationship, the change of backrest pressure is simulated by adjusting the air pressure of the air bag.

[0048] In this embodiment, seven air bags are added to the backrest of a conventional seat, and the arrangement of each air bag is as shown in Figure 4 The air bag air pressure adjustment range is 10-65 kPa, and the air pressure value of each air bag is changed, and the pressure distribution under 10 groups of air pressure is obtained uniformly in the adjustment range. Figure 5 (a-f) show the pressure distribution when the air bag air pressure is 10 kPa, 17.5 kPa, 24.3 kPa, 31.1 kPa, 44.7 kPa, and 65 kPa, respectively. Figure 5 The pressure distribution diagram shown is the interface directly output by the computer after the pressure distribution test, which can best express the effect. In order to intuitively show the pressure distribution law, the total backrest pressure, the number of measuring points with pressure greater than 0.5 N, and the total contact area are selected as the characteristic parameters changing with the air bag air pressure. As shown in Figure 6a , Figure 6b and Figure 6c When the air bag air pressure is less than 17.5 kPa, the total backrest pressure rises, but the number of points with relatively large pressure and the contact area hardly change, indicating that there is little gas distribution in this process, and it is difficult to play a supporting role. When the air bag air pressure is between 17.5 kPa and 31.1 kPa, the total backrest pressure continues to rise, the number of points with relatively large pressure increases rapidly, and the contact area begins to decrease, indicating that the air bag begins to expand in this process, which can balance the pressure. When the air bag air pressure is greater than 31.1 kPa, the total backrest pressure decreases slightly, the number of points with relatively large pressure begins to decrease, and the contact area decreases, indicating that the air bag is obviously extruded in this process, which has a negative impact on comfort. Therefore, in order to improve comfort, the relatively comfortable air pressure value of the air bag should be between 17.5 kPa and 31.1 kPa.

[0049] Meanwhile, air pressure is applied to different air bags, and the relationship between backrest pressure and air bag air pressure is analyzed, and the change trend of total backrest pressure is as shown in Figures 7a-7e Figure 7a The relationship between air bag 1&2 air pressure and total backrest pressure is shown in Figure 7b The relationship between air bag 3&4 air pressure and total backrest pressure is shown in Figure 7c The relationship between air bag 5 air pressure and total backrest pressure is shown in Figure 7d The relationship between air bag 6 air pressure and total backrest pressure is shown in Figure 7e ​The relationship between the air bag 7 air pressure and the backrest total pressure is shown, and the goodness of fit R2>95%. There is a linear relationship between the air bag air pressure and the backrest total pressure, and according to the linear relationship, the change of the backrest pressure is simulated by adjusting the air bag air pressure.

[0050] Step S3, adjusting the air bag air pressure according to the pressure distribution of the reference seat, adjusting the air bag air pressure to obtain the comfortable air pressure value of each air bag. The step S3 specifically includes: according to the position of the air bag in the pressure distribution diagram, corresponding zoning is carried out in the pressure distribution diagram, by adjusting the air bag air pressure, so that the pressure value of each region is equal to the pressure value of the corresponding region of the reference seat, and the total pressure value is equal to the pressure value of the corresponding region of the reference seat, to obtain the comfortable air pressure value of each air bag.

[0051] In this embodiment, the pressure distribution diagram is divided into 5 regions according to the position of the air bag in the pressure distribution diagram, and the zoning is as shown in Figure 8 Figure 8 is the interface directly output by the computer after instrument testing, which has the clearest expression effect. Among them, Figure 8 (a) is the pressure distribution diagram of the conventional seat at a backrest angle of 20°, Figure 8 (b) is the pressure distribution diagram of the memory cotton seat at a backrest angle of 20°. By adjusting the air bag air pressure, the total pressure value of each region is equal to the pressure value of the corresponding region of the reference seat (tolerance ±5%), and the total pressure value of the backrest is equal to the total pressure value of the backrest of the reference seat (tolerance ±5%), to obtain the comfortable air pressure value of each air bag.

[0052] Step S4, adjusting the backrest angle to obtain the corresponding comfortable air pressure value of each air bag at each backrest angle. The step S4 specifically includes: adjusting to a backrest angle, obtaining the comfortable air pressure value of each air bag at the backrest angle. Adjust the backrest angle multiple times to obtain the corresponding comfortable air pressure value of each air bag at multiple backrest angles. By fitting, the comfortable air pressure value of each air bag at each backrest angle is obtained.

[0053] In this embodiment, the backrest angle is changed to 0° / 5° / 10° / 15° / 20°, and the comfortable air pressure value of each air bag is obtained, as shown in the following table 1. Among them, NA represents that the pressure at this position is already large and cannot be filled by the air bag.

[0054] Finally, by fitting, the comfortable air pressure value of each air bag at a certain backrest angle in 0-20° can be obtained.

[0055] Table 1 comfortable air pressure value at different backrest angles (unit: kPa)

[0056] Backrest angle Airbag 1 & 2 Airbag 3 & 4 Airbag 5 Airbag 6 Airbag 7 0° 10.7 8.7 11.9 10.5 4.5 5° 13.7 10.6 6.6 NA 14 10° 18.9 19.3 9.9 NA 11.7 15° 40.3 21.6 4.7 NA 40.8 20° 35.7 30.3 7.7 NA 27.7

[0057] ​The application further provides a seat back self-adaptive adjusting device developed according to the development method of the seat back self-adaptive adjusting device.

[0058] The application has the following beneficial effects:

[0059] 1. The development method of the seat back self-adaptive adjusting device is widely applicable and is a systematic and conventional seat comfort development solution.

[0060] 2. The development method of the seat back self-adaptive adjusting device is low in cost and low in dependence on the computing capacity of the processor and the accuracy and speed of the air pressure executing mechanism, and the existing conventional seat hardware basically meets the requirements, and only software development is needed, so the method is easy to implement.

[0061] 3. The development method of the seat back self-adaptive adjusting device has a clear optimization target and considers the influence of the backrest angle on the seat comfort, and the developed seat back self-adaptive adjusting device can read the current passenger-adjusted backrest angle and automatically adjust to the air pressure value of each air bag corresponding to the backrest angle, so that the passenger only needs to adjust the backrest angle to obtain a comfortable riding experience.

[0062] The above-described embodiments are only further descriptions of the application and do not limit the application in other forms, and the application can have other various embodiments. Those skilled in the art can make various corresponding changes and modifications according to the application without departing from the spirit and essence of the application, and these corresponding changes and modifications shall fall within the protection scope of the claims of the application.

Claims

1. A method for developing a seat back self-adapting adjustment device, characterized in that, The flow of the development method comprises: Step S1, respectively test the pressure distribution of the conventional seat and the reference seat, the reference seat is selected from memory cotton seat, the pressure sensor is laid on the surface of the reference seat, the dummy is placed, the pressure distribution of the backrest under a plurality of backrest angles is tested, the plurality of backrest angles comprises 0°, 10° and 20°, and the pressure distribution of the conventional seat is tested in the same way as the control; Step S2, at least two air bags are arranged in the backrest of the conventional seat, the positions of the air bag distribution are determined according to the pressure distribution of the reference seat, the air pressure of each air bag is adjusted, the relationship between the backrest comfort and the air bag air pressure is analyzed through the relationship between the characteristic parameters and the air bag air pressure, and the comfortable air pressure target value is obtained, wherein the characteristic parameters comprise the total pressure of the backrest, the number of measurement points with pressure greater than the threshold value and the contact area; Step S3, according to the pressure distribution of the reference seat, the air pressure of each air bag is adjusted to obtain the comfortable air pressure value of each air bag, specifically comprising: according to the position of the air bag in the pressure distribution map, the pressure distribution map is correspondingly divided into zones, the air pressure of the air bag is adjusted until the pressure value of each region in the backrest of the conventional seat is equal to the pressure value of the corresponding region in the backrest of the reference seat, and the total pressure value of the backrest of the conventional seat is equal to the total pressure value of the backrest of the reference seat, and the comfortable air pressure value of each air bag is obtained; and Step S4, the backrest angle is adjusted to obtain the corresponding comfortable air pressure value of each air bag under each backrest angle.

2. The method of developing a seat back self-adapting adjustment device according to claim 1, wherein, In the step S2, the air pressure of the air bag can be stably adjusted, and the air pressure of each air bag can be adjusted individually.

3. The method of developing a seat back self-adapting adjustment device according to claim 2, wherein, In the step S2, further comprising: applying air pressure to each air bag, analyzing the relationship between the total pressure of the backrest and the air pressure of the air bag, fitting to obtain the linear relationship between the air pressure of the air bag and the total pressure of the backrest, and according to the linear relationship, the change of the backrest pressure is simulated by adjusting the air pressure of the air bag.

4. The method of developing a seat back self-adapting adjustment device according to claim 1, wherein, The step S4 specifically comprises: adjusting to a backrest angle to obtain the comfortable air pressure value of each air bag under the backrest angle; The backrest angle is adjusted multiple times to obtain the corresponding comfortable air pressure value of each air bag under multiple backrest angles.

5. The method of developing a seat back self-adapting adjustment device according to claim 4, wherein, The step S4 further specifically comprises: obtaining the comfortable air pressure value of each air bag under each backrest angle by fitting.

6. A seat back self-adapting adjustment device, characterized in that, The adjusting device is developed according to the development method of the seat backrest self-adaptive adjusting device in any one of claims 1 to 5, the adjusting device is installed on the seat, the seat is provided with a backrest and an angle adjuster, the seat is provided with air bags in the backrest, the adjusting device comprises a detection module and a control module, after the angle adjuster adjusts the backrest angle, the detection module identifies the backrest angle and sends it to the control module, and the control module reads the backrest angle and automatically adjusts each air bag to the corresponding comfortable air pressure value under the backrest angle.

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