Vehicle seat system and vehicle seat backboard adjustment method

Abstract

The present application discloses a vehicle seat system and a method for adjusting a vehicle seat back. The system includes a seat, a back panel, an upper slider assembly, a lower slider assembly, an upper link, a lower link, a drive motor, and a controller. After the seat back is deflected, the controller obtains the current position of the upper link and the current position of the lower link. The controller sets a back panel target position and obtains the upper link target position and the lower link target position corresponding to the back panel target position. The upper slider displacement is obtained based on the upper link current position and the upper link target position. The lower slider displacement is obtained based on the lower link current position and the lower link target position. The back panel target position is adjusted to minimize the total displacement of the upper slider displacement and the lower slider displacement. The drive motor is controlled to move the upper slider assembly, the lower slider assembly, and the lower link according to the corresponding displacements and angles. The back panel position can be adaptively adjusted as the seat tilts, and the adjustment occupies less space, providing better comfort and convenience.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle component control, and in particular to a vehicle seat system and a method for adjusting a vehicle seat back. Background Art

[0002] As people's requirements for the functionality and comfort of vehicle interiors increase, more and more vehicles are equipped with back panels behind the seats, which can be used as functional devices such as small tables or display screens.

[0003] However, the existing technology often only realizes the free adjustment of the opening angle of the back panel body. When the seat leans back, the back panel cannot automatically adjust its position with the seat, which affects the user experience and needs to be manually adjusted by the user, which is less convenient. Summary of the Invention

[0004] In view of this, the present application provides a vehicle seat system and a method for adjusting a vehicle seat backboard, which can adaptively adjust the position of the backboard as the seat tilts, and takes up less space during adjustment, providing better comfort and convenience.

[0005] To solve the above problems, the technical solutions provided by this application are as follows:

[0006] In a first aspect, the present application provides a vehicle seat system, comprising: a seat, a back panel, an upper slider assembly, a lower slider assembly, an upper connecting rod, a lower connecting rod, a drive motor, and a controller;

[0007] The upper slider assembly and the lower slider assembly are both fixed to the seat back;

[0008] The first end of the upper connecting rod is connected to the upper slider assembly; the second end of the upper connecting rod is connected to the upper connecting rod fixed shaft of the back plate;

[0009] The first end of the lower connecting rod is connected to the lower slider assembly; the second end of the lower connecting rod is connected to the lower connecting rod fixed shaft of the back plate;

[0010] Controller for:

[0011] After the seat back is deflected, the current position of the upper link and the current position of the lower link are obtained;

[0012] Set the backplate target position, and obtain the upper link target position and the lower link target position corresponding to the backplate target position;

[0013] The displacement of the upper slider is obtained according to the current position of the upper link and the target position of the upper link; the displacement of the lower slider is obtained according to the current position of the lower link and the target position of the lower link;

[0014] Adjust the target position of the back plate so that the total displacement of the upper slider and the lower slider is the shortest;

[0015] The drive motor is controlled to move the upper slider assembly according to the upper slider displacement when the total displacement is the shortest; the drive motor is controlled to move the lower slider assembly according to the lower slider displacement when the total displacement is the shortest; the drive motor is controlled to make the azimuth angle of the lower connecting rod the angle corresponding to the target position of the lower connecting rod when the total displacement is the shortest.

[0016] Preferably, the controller is specifically used to obtain the upper link target position and the lower link target position corresponding to the backboard target position based on the backboard target position, the deflection angle of the chair back, the length of the upper link, the length of the lower link and the backboard axis width; the backboard axis width is the width between the upper link fixed axis and the lower link fixed axis.

[0017] Preferably, the seat includes a seat back rotation axis; the connection between the upper connecting rod and the upper slider assembly is the first rotation center; the connection between the lower connecting rod and the lower slider assembly is the second rotation center;

[0018] Controller, specifically for:

[0019] Establish a plane rectangular coordinate system with the side of the seat as the plane and the center of the seat back rotation axis as the origin;

[0020] In the coordinate system, the position of the upper link is represented by the coordinates of the first rotation center and the coordinates of the fixed axis of the upper link; the position of the lower link is represented by the coordinates of the second rotation center and the coordinates of the fixed axis of the lower link; the position of the back plate is represented by the coordinates of the fixed axis of the upper link and the coordinates of the fixed axis of the lower link.

[0021] Preferably, the controller is specifically configured to:

[0022] Establishing a first positional relationship between the first rotation center and the second rotation center based on an initial angle between the seat back and the coordinate axis, a deflection angle of the seat back, and an offset between the center of the slider and the seat rotation axis;

[0023] Establishing a second positional relationship between the first rotation center and the fixed axis of the upper link according to the length of the upper link and the azimuth angle of the upper link;

[0024] establishing a third positional relationship between the second rotation center and the fixed axis of the lower link according to the length and the azimuth angle of the lower link;

[0025] Establishing a fourth positional relationship between the upper link fixed axis and the lower link fixed axis according to the back plate axis width and the azimuth angle of the back plate;

[0026] Based on the first positional relationship, the second positional relationship, the third positional relationship, and the fourth positional relationship, a relationship between the coordinates of the first rotation center, the coordinates of the second rotation center, and the target position of the back plate is obtained.

[0027] Preferably, one side of the back panel serves as a small table top; the other side of the back panel serves as a display screen;

[0028] When the back panel is used as a display screen, the controller is also used to control the lower slider assembly and the upper slider assembly so that the lower connecting rod fixed axis is higher than the upper connecting rod fixed axis.

[0029] Preferably, the upper slider assembly specifically includes a first upper slider assembly and a second upper slider assembly; the lower slider assembly specifically includes a first lower slider assembly and a second lower slider assembly; the upper connecting rod specifically includes a first upper connecting rod and a second upper connecting rod; and the lower connecting rod specifically includes a first lower connecting rod and a second lower connecting rod.

[0030] The drive motors specifically include: a first drive motor, a second drive motor and a third drive motor;

[0031] The first upper slider assembly, the second upper slider assembly, the first lower slider assembly, and the second lower slider assembly are all fixed to the seat back;

[0032] The first end of the first upper connecting rod is connected to the first upper slider assembly, and the second end of the first upper connecting rod is connected to the first end of the upper connecting rod fixed shaft;

[0033] The first end of the second upper connecting rod is connected to the second upper slider assembly, and the second end of the second upper connecting rod is connected to the second end of the upper connecting rod fixed shaft;

[0034] The first end of the first lower connecting rod is connected to the first lower slider assembly, and the second end of the first lower connecting rod is connected to the first end of the lower connecting rod fixed shaft;

[0035] The first end of the second lower connecting rod is connected to the second lower slider assembly, and the second end of the second lower connecting rod is connected to the second end of the lower connecting rod fixed shaft;

[0036] The first drive motor is used to control the displacement of the first lower slider assembly; the second drive motor is used to control the azimuth angle of the lower connecting rod; and the third drive motor is used to control the displacement of the first upper slider assembly.

[0037] Preferably, the first lower slider assembly specifically includes: a lower slider shaft, a first bearing, a second bearing, a lower slider gear, a lower slider rack, a first lower slider and a first lower slider guide rail;

[0038] The first drive motor is connected to the lower slider shaft by a key; the lower slider shaft and the lower slider gear are connected by a key;

[0039] The lower slider shaft is connected to the first lower connecting rod through the first bearing; the lower slider shaft is connected to the first lower slider through the second bearing; the first lower slider and the first lower slider guide rail are connected by a moving pair; the first lower slider guide rail, the lower slider rack and the seat are fixedly connected.

[0040] Preferably, the second lower slider assembly specifically includes: a lower connecting rod shaft, a third bearing, a second lower slider and a second lower slider guide rail;

[0041] The second drive motor is connected to the lower connecting rod shaft by a key; the lower connecting rod shaft is connected to the second lower connecting rod by a key;

[0042] The lower connecting rod shaft is connected to the second lower slider through the third bearing; the second lower slider and the second lower slider guide rail are connected by a moving pair; and the second lower slider guide rail and the seat are fixedly connected.

[0043] A second aspect of the present application provides a method for adjusting a vehicle seat back panel, which is applied to a vehicle seat system, the system comprising: a seat, a back panel, an upper slider assembly, a lower slider assembly, an upper connecting rod, a lower connecting rod, a drive motor, and a controller;

[0044] The upper slider assembly and the lower slider assembly are both fixed to the seat back;

[0045] The first end of the upper connecting rod is connected to the upper slider assembly; the second end of the upper connecting rod is connected to the upper connecting rod fixed shaft of the back plate;

[0046] The first end of the lower connecting rod is connected to the lower slider assembly; the second end of the lower connecting rod is connected to the lower connecting rod fixed shaft of the back plate;

[0047] Methods include:

[0048] After the seat back is deflected, the current position of the upper link and the current position of the lower link are obtained;

[0049] Set the backplate target position, and obtain the upper link target position and the lower link target position corresponding to the backplate target position;

[0050] The displacement of the upper slider is obtained according to the current position of the upper link and the target position of the upper link; the displacement of the lower slider is obtained according to the current position of the lower link and the target position of the lower link;

[0051] Adjust the target position of the back plate so that the total displacement of the upper slider and the lower slider is the shortest;

[0052] The upper slider assembly is controlled to move according to the upper slider displacement when the total displacement is the shortest; the lower slider assembly is controlled to move according to the lower slider displacement when the total displacement is the shortest; and the azimuth angle of the lower link is controlled to be the angle corresponding to the target position of the lower link when the total displacement is the shortest.

[0053] Preferably, obtaining the upper connecting rod target position and the lower connecting rod target position corresponding to the back plate target position specifically includes:

[0054] According to the backboard target position, the deflection angle of the seat back, the length of the upper link, the length of the lower link and the backboard axis width, the upper link target position and the lower link target position corresponding to the backboard target position are obtained; the backboard axis width is the width between the upper link fixed axis and the lower link fixed axis.

[0055] Preferably, the seat includes a seat back rotation axis; the connection between the upper connecting rod and the upper slider assembly is the first rotation center; the connection between the lower connecting rod and the lower slider assembly is the second rotation center;

[0056] The positions of the upper link, lower link, and back plate are represented as follows:

[0057] Establish a plane rectangular coordinate system with the side of the seat as the plane and the center of the seat back rotation axis as the origin;

[0058] In the coordinate system, the position of the upper link is represented by the coordinates of the first rotation center and the coordinates of the fixed axis of the upper link; the position of the lower link is represented by the coordinates of the second rotation center and the coordinates of the fixed axis of the lower link; the position of the back plate is represented by the coordinates of the fixed axis of the upper link and the coordinates of the fixed axis of the lower link.

[0059] Preferably, obtaining the upper connecting rod target position and the lower connecting rod target position corresponding to the back plate target position specifically includes:

[0060] Establishing a first positional relationship between the first rotation center and the second rotation center based on an initial angle between the seat back and the coordinate axis, a deflection angle of the seat back, and an offset between the center of the slider and the seat rotation axis;

[0061] Establishing a second positional relationship between the first rotation center and the fixed axis of the upper link according to the length of the upper link and the azimuth angle of the upper link;

[0062] establishing a third positional relationship between the second rotation center and the fixed axis of the lower link according to the length and the azimuth angle of the lower link;

[0063] Establishing a fourth positional relationship between the upper link fixed axis and the lower link fixed axis according to the back plate axis width and the azimuth angle of the back plate;

[0064] Based on the first positional relationship, the second positional relationship, the third positional relationship, and the fourth positional relationship, a relationship between the coordinates of the first rotation center, the coordinates of the second rotation center, and the target position of the back plate is obtained.

[0065] It can be seen that this application has the following beneficial effects:

[0066] The vehicle seat system provided in this application includes: a seat, a back panel, an upper slider assembly, a lower slider assembly, an upper connecting rod, a lower connecting rod, a drive motor, and a controller; the upper and lower slider assemblies are both fixed to the seat back; the first end of the upper connecting rod is connected to the upper slider assembly; the second end of the upper connecting rod is connected to the upper connecting rod fixed shaft of the back panel; the first end of the lower connecting rod is connected to the lower slider assembly; the second end of the lower connecting rod is connected to the lower connecting rod fixed shaft of the back panel. The controller is used to: obtain the current position of the upper and lower connecting rods after the seat back is deflected; set the back panel target position, and obtain the upper and lower connecting rod target positions corresponding to the back panel target position. Under the above-described structure and connection relationship, since the lengths of the upper and lower connecting rods are fixed, and the upper and lower slider assemblies are both fixed to the seat back, the angle of the seat back does not change after deflection is completed. The upper and lower slider assemblies slide along the straight line on which the seat back is located; therefore, the corresponding upper and lower connecting rod target positions can be determined by setting the back plate target position. The upper slider displacement is obtained based on the current position of the upper connecting rod and the upper connecting rod target position; the lower slider displacement is obtained based on the current position of the lower connecting rod and the lower connecting rod target position; the back plate target position is adjusted to minimize the total displacement of the sum of the upper and lower slider displacements. The drive motor is controlled to move the upper slider assembly according to the upper slider displacement when the total displacement is minimized; the drive motor is controlled to move the lower slider assembly according to the lower slider displacement when the total displacement is minimized; and the drive motor is controlled to adjust the azimuth angle of the lower connecting rod to the angle corresponding to the lower connecting rod target position when the total displacement is minimized. Controlling the position of the upper and lower slider assemblies and the connecting rod angle can ensure the stability of the back panel after adjustment; by controlling according to the parameters when the total displacement is the shortest, the displacement is minimized during the adjustment process, the occupied space is also correspondingly minimized, and the impact on surrounding people and objects is small, thereby improving the comfort and convenience of using the vehicle seat back panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 A schematic diagram of a vehicle seat system provided in an embodiment of the present application;

[0068] Figure 2 A schematic diagram of a coordinate system for a vehicle seat system provided in an embodiment of the present application;

[0069] Figure 3 A schematic diagram of various structures of a vehicle seat system provided in an embodiment of the present application in a coordinate system;

[0070] Figure 4 A schematic diagram of a back panel of a vehicle seat system provided in an embodiment of the present application;

[0071] Figure 5 A schematic diagram of switching back panel modes of a vehicle seat system provided in an embodiment of the present application;

[0072] Figure 6 A schematic diagram of adjusting the back panel of a vehicle seat system provided in an embodiment of the present application;

[0073] Figure 7 A schematic diagram of a first lower slider assembly provided in an embodiment of the present application;

[0074] Figure 8 A schematic diagram of a second lower slider assembly provided in an embodiment of the present application;

[0075] Figure 9 A schematic diagram of a first upper slider assembly provided in an embodiment of the present application;

[0076] Figure 10 A schematic diagram of a second upper slider assembly provided in an embodiment of the present application;

[0077] Figure 11 A flowchart of a method for adjusting a vehicle seat back panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0078] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0079] See also Figure 1 , which is a schematic diagram of a vehicle seat system provided in an embodiment of the present application.

[0080] The vehicle seat system provided in the embodiment of the present application includes: a seat 101, a back panel 102, an upper slider assembly 103, a lower slider assembly 104, an upper connecting rod 105, a lower connecting rod 106, a drive motor 107 and a controller (not shown in the figure).

[0081] The upper slider assembly 103 and the lower slider assembly 104 are both fixed to the backrest of the seat 101 .

[0082] A first end of the upper connecting rod 105 is connected to the upper slider assembly 103 ; a second end of the upper connecting rod 105 is connected to the upper connecting rod fixing shaft 121 of the back plate 102 .

[0083] A first end of the lower connecting rod 106 is connected to the lower slider assembly 104 ; a second end of the lower connecting rod 106 is connected to the lower connecting rod fixing shaft 122 of the back plate 102 .

[0084] In order to conveniently and clearly introduce the vehicle seat system provided by the embodiment of the present application, Figure 1The following description uses two upper connecting rods and two lower connecting rods as an example. It should be understood that the use of two upper connecting rods and two lower connecting rods makes the back plate more stable; however, in other possible implementations, one upper connecting rod and one lower connecting rod may also be used in the middle of the back plate, and this application does not make specific limitations on this.

[0085] Corresponding to the case of two upper connecting rods and two lower connecting rods, the upper slider assembly specifically includes the first upper slider assembly and the second upper slider assembly; the lower slider assembly specifically includes the first lower slider assembly and the second lower slider assembly; the upper connecting rod specifically includes the first upper connecting rod and the second upper connecting rod; and the lower connecting rod specifically includes the first lower connecting rod and the second lower connecting rod.

[0086] The two upper slider assemblies, the two lower slider assemblies, the two upper connecting rods and the two lower connecting rods are respectively arranged on the left and right sides of the seat back. This application does not limit the specific location of the above structure on the seat back.

[0087] The first upper slider assembly, the second upper slider assembly, the first lower slider assembly and the second lower slider assembly are all fixed to the seat back.

[0088] The first end of the first upper connecting rod is connected to the first upper slider assembly, and the second end of the first upper connecting rod is connected to the first end of the upper connecting rod fixed shaft. The first end of the second upper connecting rod is connected to the second upper slider assembly, and the second end of the second upper connecting rod is connected to the second end of the upper connecting rod fixed shaft.

[0089] The first end of the first lower connecting rod is connected to the first lower slider assembly, and the second end of the first lower connecting rod is connected to the first end of the lower connecting rod fixed shaft. The first end of the second lower connecting rod is connected to the second lower slider assembly, and the second end of the second lower connecting rod is connected to the second end of the lower connecting rod fixed shaft.

[0090] The three drive motors 107 are also only used as a possible implementation method, which are respectively connected to the second upper link, the first lower link and the second lower link; this application does not specifically limit the number of drive motors used and the installation position; for example: the drive motor of the second upper link can also be installed on the first upper link.

[0091] Controller for:

[0092] After the seat back is deflected, the current positions of the upper link and the lower link are obtained.

[0093] It should be understood that when the seat back deflects, the previously properly positioned back panel changes position, necessitating adjustment. The current positions of the upper and lower links obtained here refer to their positions after the seat back deflects and before adjustment.

[0094] for Figure 1In the vehicle seat system shown, since the first and second upper links are both connected to the upper link fixed axis, they are always parallel. Therefore, by obtaining the position of an upper link, the position of any upper link can be determined. Similarly, since the first and second lower links are always parallel, the position of any lower link can be determined.

[0095] Set the backplate target position and obtain the upper link target position and lower link target position corresponding to the backplate target position.

[0096] Among them, the backboard target position is set, and specifically the distance between the backboard and the seat back, the backboard angle, etc. can be set; since the lengths of the upper connecting rod and the lower connecting rod are fixed, and the upper slider assembly and the lower slider assembly are fixed to the seat back, the angle of the seat back no longer changes after the deflection is completed, and the upper slider assembly and the lower slider assembly slide along the straight line where the seat back is located; therefore, the corresponding upper connecting rod target position and lower connecting rod target position can be determined by setting the backboard target position.

[0097] Since there are many possible backplane target positions, the backplane target position can be set without setting specific parameters and can be represented by variables.

[0098] The displacement of the upper slider is obtained according to the current position of the upper link and the target position of the upper link; the displacement of the lower slider is obtained according to the current position of the lower link and the target position of the lower link.

[0099] Adjust the target position of the back plate so that the total displacement of the sum of the upper slider displacement and the lower slider displacement is the shortest.

[0100] In order to reduce the space occupied by the backboard during adjustment, the controller obtains the upper and lower slider displacements between the target position and the current position respectively, and adjusts the target position of the backboard with the shortest total displacement of the sum of the upper and lower slider displacements as the goal.

[0101] For the case where the backplane target position is represented by a variable in the above example, the total displacement expression with the backplane target position variable can be obtained, and conversely, the value of the backplane target position variable when the total displacement expression reaches the minimum value can be solved.

[0102] The drive motor is controlled to move the upper slider assembly according to the upper slider displacement when the total displacement is the shortest; the drive motor is controlled to move the lower slider assembly according to the lower slider displacement when the total displacement is the shortest; the drive motor is controlled to make the azimuth angle of the lower connecting rod the angle corresponding to the target position of the lower connecting rod when the total displacement is the shortest.

[0103] After controlling the positions of the upper and lower slider assemblies, if the angles of the upper and lower connecting rods are not controlled, the angle of the back panel will still be difficult to fix, and the unstable adjustment of the back panel will still affect user use; therefore, while controlling the positions of the upper and lower slider assemblies, it is also necessary to control the azimuth angle of the lower connecting rod.

[0104] Since the control is based on the angle of the upper slider displacement, lower slider displacement and lower link target position corresponding to the shortest total displacement, the displacement is minimized during the adjustment process, the occupied space is also minimized, the impact on surrounding people and objects is small, and the convenience of using the vehicle seat back is improved.

[0105] The vehicle seat system provided in an embodiment of the present application includes: a seat, a back panel, an upper slider assembly, a lower slider assembly, an upper connecting rod, a lower connecting rod, a drive motor, and a controller; the upper slider assembly and the lower slider assembly are both fixed to the seat back; the first end of the upper connecting rod is connected to the upper slider assembly; the second end of the upper connecting rod is connected to the upper connecting rod fixed shaft of the back panel; the first end of the lower connecting rod is connected to the lower slider assembly; the second end of the lower connecting rod is connected to the lower connecting rod fixed shaft of the back panel. The controller is configured to: obtain the current position of the upper connecting rod and the current position of the lower connecting rod after the seat back deflects; set the back panel target position, and obtain the upper connecting rod target position and the lower connecting rod target position corresponding to the back panel target position. Under the above-described structure and connection relationship, since the lengths of the upper and lower connecting rods are fixed, and the upper and lower slider assemblies are both fixed to the seat back, the angle of the seat back does not change after deflection is completed. The upper and lower slider assemblies slide along the straight line on which the seat back is located; therefore, the corresponding upper and lower connecting rod target positions can be determined by setting the back plate target position. The upper slider displacement is obtained based on the current position of the upper connecting rod and the upper connecting rod target position; the lower slider displacement is obtained based on the current position of the lower connecting rod and the lower connecting rod target position; the back plate target position is adjusted to minimize the total displacement of the sum of the upper and lower slider displacements. The drive motor is controlled to move the upper slider assembly according to the upper slider displacement when the total displacement is minimized; the drive motor is controlled to move the lower slider assembly according to the lower slider displacement when the total displacement is minimized; and the drive motor is controlled to adjust the azimuth angle of the lower connecting rod to the angle corresponding to the lower connecting rod target position when the total displacement is minimized. Controlling the position of the upper and lower slider assemblies and the connecting rod angle can ensure the stability of the back panel after adjustment; by controlling according to the parameters when the total displacement is the shortest, the displacement is minimized during the adjustment process, the occupied space is also correspondingly minimized, and the impact on surrounding people and objects is small, thereby improving the comfort and convenience of using the vehicle seat back panel.

[0106] In some embodiments, the controller is specifically used to obtain the upper link target position and the lower link target position corresponding to the backboard target position based on the backboard target position, the deflection angle of the chair back, the length of the upper link, the length of the lower link and the backboard axis width; the backboard axis width is the width between the upper link fixed axis and the lower link fixed axis.

[0107] The following describes a specific process of obtaining the upper connecting rod target position and the lower connecting rod target position corresponding to the back plate target position through the back plate target position with reference to the accompanying drawings.

[0108] See also Figure 2 , this figure is a schematic diagram of a coordinate system for building a vehicle seat system provided in an embodiment of the present application.

[0109] The seat includes a seatback rotation axis about which the seatback rotates when deflected.

[0110] The connection point between the upper connecting rod and the upper slider assembly is the first rotation center; the connection point between the lower connecting rod and the lower slider assembly is the second rotation center.

[0111] The controller is specifically used to establish a plane rectangular coordinate system with the side of the seat as a plane and the center of the seat back rotation axis as the origin.

[0112] As a possible implementation, the seat may have the function of moving forward and backward in addition to the deflection of the seat back. Figure 2 In the diagram, point O represents the center of the seat back rotation axis before the seat is adjusted forward and backward; point O1 represents the center of the seat back rotation axis after the seat is adjusted forward and backward. Figure 2 A coordinate system is established at point O. It should be understood that the coordinate system can also be established at point O1, and this application does not limit this.

[0113] Figure 2 In the figure, point A represents the second rotation center; point B represents the first rotation center; point C represents the fixed axis of the lower link; and point D represents the fixed axis of the upper link.

[0114] θ0 is the angle between the initial position of the seat and the y-axis, which is positive clockwise; θs is the angle between the seat and the initial position after the seat is adjusted forward and backward and the seat back is deflected, which is positive clockwise.

[0115] exist Figure 2 In the coordinate system shown, the position of the upper link can be represented by the coordinates of the first rotation center B and the coordinates of the upper link fixed axis D; the position of the lower link can be represented by the coordinates of the second rotation center A and the coordinates of the lower link fixed axis C; the position of the back plate can be represented by the coordinates of the upper link fixed axis D and the coordinates of the lower link fixed axis C.

[0116] Extract the above parameters from the three-dimensional seating system, see Figure 3 , this figure is a schematic diagram of the various structures of a vehicle seat system provided in an embodiment of the present application in a coordinate system.

[0117] Figure 3In addition to the second rotation center A and the first rotation center B described above, the two parallel oblique lines represent the line along the seatback's rotation axis (hereinafter referred to as the seat rotation axis) and the line along which the upper and lower slider assemblies are located. It should be understood that due to the thickness of the seat and slider, there is an offset d between the slider center and the seat rotation axis.

[0118] θ1, θ2, and θ3 are the azimuth angles of the lower link AC, upper link BD, and back plate CD, respectively, and counterclockwise is positive.

[0119] l1, l2, and l3 are the backplate axis widths of the lower link AC, upper link BD, and backplate CD, respectively. The backplate axis width is the width between the upper link's fixed axis and the lower link's fixed axis.

[0120] x0 is the distance between point O and point O1, which is the displacement of the seat moving forward and backward.

[0121] Assume that the coordinates of the second rotation center A, the first rotation center B, the lower connecting rod fixed axis C, and the upper connecting rod fixed axis D are: A(x1, y1), B(x2, y2), C(x3, y3), and D(x4, y4).

[0122] Based on the initial angle θ0 between the seat back and the coordinate axis, the deflection angle θs of the seat back, and the offset d between the slider center and the seat rotation axis, a first positional relationship between the first rotation center B and the second rotation center A is established:

[0123] Points A and B are on the same straight line, that is:

[0124]

[0125] Where: k = cot(θ0 + θ s ), b=-cot(θ0+θ s )x0-d / sin(θ0+θ s ).

[0126] According to the length l2 of the upper link BD and the azimuth angle θ2 of the upper link BD, a second positional relationship between the first rotation center B and the upper link fixed axis D is established:

[0127]

[0128] According to the length of the lower link AC and the azimuth angle θ1 of the lower link AC, a third positional relationship between the second rotation center A and the lower link fixed axis C is established:

[0129]

[0130] According to the back plate axis width l3 and the azimuth angle θ3 of the back plate CD, the fourth position relationship between the upper connecting rod fixed axis D and the lower connecting rod fixed axis C is established:

[0131]

[0132] Based on the first positional relationship, the second positional relationship, the third positional relationship, and the fourth positional relationship, a relationship between the coordinates of the first rotation center, the coordinates of the second rotation center, and the target position of the back plate is obtained.

[0133] The combined equations (1) to (4) can be used to obtain the relationship between the direction angle θ1 of the second rotation center A, the first rotation center B, and the lower link AC and the target position of the back plate, that is, the coordinate change of the upper link fixed axis D and the lower link fixed axis C:

[0134]

[0135]

[0136]

[0137] in,

[0138] On this basis, the principle of minimum total displacement is adopted to solve the values ​​of x1 and x2 when the total displacement is the shortest, thereby obtaining the displacement of the upper slider and the lower slider, and the direction angle of the lower connecting rod through formula (7).

[0139] In some embodiments, in order to improve the functional diversity of the vehicle seat system, one side of the back panel serves as a small table; the other side of the back panel serves as a display screen. Figure 4 , which is a schematic diagram of the back panel of a vehicle seat system provided in an embodiment of the present application.

[0140] Figure 4 (a) shows a schematic diagram of the back panel serving as a small table. Reference numeral 401 denotes a cup holder. The two grooves on the upper edge of the rectangular shape represent the connection points between the first upper connecting rod and the second upper connecting rod.

[0141] Figure 4 (b) shows the other side of the back panel, which is the side that serves as the display screen, where 402 is the display screen.

[0142] When the back panel is used as a display screen, the controller is also used to control the lower slider assembly and the upper slider assembly so that the lower connecting rod fixed axis is higher than the upper connecting rod fixed axis.

[0143] In order to enable those skilled in the art to more intuitively understand the use of the dual-purpose back panel of the small table and display screen provided in the embodiment of the present application, see Figure 5, this figure is a schematic diagram of switching the back panel mode of a vehicle seat system provided in an embodiment of the present application.

[0144] Starting from the initial position of the backplane, in order to prevent interference and dead points in movement, the following describes a movement method when the backplane is switched.

[0145] Figure 5 (a) shows the initial position of the back plate. It can be seen that the upper slider and the lower slider are at their farthest positions. First, the upper slider moves downward, while the lower slider does not move, until the lower link reaches its first limit position. Figure 5 (b) As shown. Then the upper slider does not move, the lower slider moves upward, and at the same time the lower connecting rod rotates clockwise to reach the upper connecting rod limit position, as shown Figure 5 (c). Then the lower link continues to move clockwise, and the lower slider continues to move upward, making the small table horizontal and reaching the initial position of the small table. Figure 5 (d) The above process realizes the process of switching the back panel from the initial position (i.e., the folded position) to the initial position of the small table.

[0146] exist Figure 5 (d) The tabletop is in its initial position, the upper and lower sliders are stationary, and the lower link rotates counterclockwise to reach its second limit position. Figure 5 (e) Then the lower link continues to rotate counterclockwise to make the display perpendicular to the ground and reach the preset display position. Figure 5 (f). Then the lower slider moves upward and the lower connecting rod rotates counterclockwise to reach the initial position of the display screen. Figure 5 (g) The above process realizes the process of switching the back panel from the initial position of the small table to the initial position of the display screen.

[0147] When returning, just follow the reverse order to return to the initial position of the small table and the initial position of the back panel. The switching process will not be repeated here.

[0148] In order to enable those skilled in the art to more intuitively understand the adjustment effect of the backplane provided by the embodiment of the present application, see Figure 6 , this figure is a schematic diagram of the adjustment of the back panel of a vehicle seat system provided in an embodiment of the present application.

[0149] After solving the corresponding upper slider displacement, lower slider displacement and lower connecting rod direction angle according to the principle of shortest total displacement in the above process, when the seat posture changes, the seat back can keep the small table level and at an unchanged height based on the above data.

[0150] Figure 6 (a) Adjust the position of the front tray table for the seat; Figure 6 (b) The position of the seat and tray table when the seat back is tilted 10 degrees but adaptive adjustment is not performed; Figure 6(c) Indicates the position of the seat and small table after the seat back is tilted back 10 degrees and adaptive adjustment is performed.

[0151] Similarly, Figure 6 (d) shows the position of the display screen before seat adjustment; Figure 6 (e) The position of the seat and display screen when the seat back is tilted 10 degrees but adaptive adjustment is not performed; Figure 6 (f) indicates the position of the seat and display screen after the seat back is tilted back 10 degrees and adaptive adjustment is performed.

[0152] It can be seen that the vehicle seat system provided in the embodiment of the present application can flexibly and automatically adjust the angle and position of the back panel when the seat back is deflected. Whether used as a small table or as a display screen, it can be easily adjusted to bring a more comfortable experience to the user.

[0153] In some embodiments, to facilitate control of the upper slider assembly, lower slider assembly, and lower connecting rod angular orientation, three drive motors are provided for separate control, resulting in simple and easy implementation. Specifically, the drive motors include: a first drive motor, a second drive motor, and a third drive motor.

[0154] The first drive motor is used to control the displacement of the first lower slider assembly; the second drive motor is used to control the azimuth angle of the lower connecting rod; and the third drive motor is used to control the displacement of the first upper slider assembly.

[0155] The possible specific structures of the upper slider assembly and the lower slider assembly provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0156] by Figure 1 As the overall structure of the vehicle seat system, the specific structure of the first lower slider assembly is introduced below. Figure 7 , this figure is a schematic diagram of a first lower slider assembly provided in an embodiment of the present application.

[0157] The first lower slider assembly specifically includes: a lower slider shaft 701 , a first bearing 702 , a second bearing 703 , a lower slider gear 704 , a lower slider rack 705 , a first lower slider 706 and a first lower slider guide rail 707 .

[0158] like Figure 7 (a) and Figure 7 (b), the first driving motor 610 is connected to the lower slider shaft 701 by a key 711. Figure 7 (c) The lower slider shaft 701 and the lower slider gear 704 are connected by a key 712.

[0159] Under the above connection relationship, the rotation of the first driving motor 610 can drive the lower slider gear 704 to rotate on the lower slider rack 705 through the lower slider shaft 701 .

[0160] like Figure 7 (b), the lower slider shaft 701 is connected to the first lower connecting rod 1061 through the first bearing 702; Figure 7 (d) and Figure 7 (e) The lower slider shaft 701 is connected to the first lower slider 706 via the second bearing 703, thereby keeping the lower slider gear 704 and the first lower slider 706 displacing in the same direction.

[0161] like Figure 7 (e) The first lower slider 706 is connected to the first lower slider guide rail 707 by a moving pair. The first lower slider guide rail 707, the lower slider rack 705 and the seat are fixedly connected.

[0162] Under the above-mentioned structure and connection relationship of the first lower slider assembly, the first drive motor 610 can rotate and drive the gear to move on the rack, and the rack and the lower slider both move on the lower slider guide rail. Therefore, the first drive motor 610 can control the displacement of the first lower slider assembly.

[0163] See also Figure 8 , this figure is a schematic diagram of a second lower slider assembly provided in an embodiment of the present application.

[0164] The second lower slider assembly specifically includes: a lower connecting rod shaft 801 , a third bearing 802 , a second lower slider 803 and a second lower slider guide rail 804 .

[0165] like Figure 8 (a) The second driving motor 620 is connected to the lower connecting rod shaft 801 by a key; the lower connecting rod shaft 801 is connected to the second lower connecting rod 1062 by a key.

[0166] Under the above connection relationship, the rotation of the second drive motor 620 can drive the rotation of the second lower connecting rod 1062. Therefore, the second drive motor 620 can control the azimuth angle of the second lower connecting rod.

[0167] like Figure 8 (b), the lower connecting rod shaft 801 is connected to the second lower slide block 803 through the third bearing 802; Figure 8 (c) The second lower slider 803 and the second lower slider guide rail 804 are connected by a moving pair; the second lower slider guide rail 804 and the seat are fixedly connected.

[0168] Under the above-mentioned connection relationship, the second lower slider 803 can produce synchronous displacement with the first lower slider 706 under the action of the first lower link, the second lower link and the lower link fixed axis; similarly, the first lower link 1061 also produces synchronous azimuth rotation with the second lower link 1062 under the action of the lower link fixed axis.

[0169] Figure 7 and Figure 8 The present invention discloses the possible lower slider structure and connection relationship when the drive motor controls the lower slider assembly and the lower connecting rod. Among them, the third drive motor controls the displacement of the first upper slider assembly, and its principle is similar to that of the first drive motor controlling the displacement of the first lower slider assembly.

[0170] See also Figure 9 , this figure is a schematic diagram of a first upper slider assembly provided in an embodiment of the present application.

[0171] The first upper slider assembly specifically includes: a first upper connecting rod shaft 901 , a fourth bearing 902 , a fifth bearing 903 , an upper slider gear 904 , an upper slider rack 905 , an upper slider 906 and a first upper slider guide rail 907 .

[0172] like Figure 9 (a) and Figure 9 (b) The third driving motor 630 is connected to the first upper connecting rod shaft 901 by a key. The first upper connecting rod shaft 901 is connected to the upper slider gear 904 by a key.

[0173] like Figure 9 (a), the first upper connecting rod shaft 901 is connected to the first upper connecting rod 1051 through the fourth bearing 902; Figure 9 (c) The first upper slider 906 is connected to the first upper connecting rod shaft 901 through the fifth bearing 903, thereby keeping the upper slider gear 904 and the first upper slider 906 displaced in the same direction.

[0174] like Figure 9 (d) The first upper slider 906 is connected to the first upper slider guide rail 907 by a moving pair. The first upper slider guide rail 907, the upper slider rack 905 and the seat are fixedly connected.

[0175] See also Figure 10 , this figure is a schematic diagram of a second upper slider assembly provided in an embodiment of the present application.

[0176] The second upper slider assembly specifically includes: a second upper slider 1001 , a sixth bearing 1002 , and a second upper slider guide rail 1003 .

[0177] like Figure 10 (a), the second upper slider 1001 is connected to the second upper connecting rod 1052 through the sixth bearing 1002.

[0178] like Figure 10 (b) The second upper slider 1001 and the second upper slider guide rail 1003 are connected by a moving pair; the second upper slider guide rail 1003 is fixedly connected to the seat.

[0179] The second upper slider 1001 can generate synchronous displacement with the first upper slider 906 under the action of the first upper link, the second upper link and the upper link fixed shaft.

[0180] When the position of the upper slider assembly, the position of the lower slider assembly and the direction angle of the lower connecting rod are fixed, the direction angle of the upper connecting rod will also be fixed; therefore, there is no need to control the direction angle of the upper connecting rod separately.

[0181] Based on the vehicle seat system provided in the above embodiments, the embodiments of the present application further provide a method for adjusting a vehicle seat back panel, which is described in detail below with reference to the accompanying drawings.

[0182] See also Figure 11 , which is a flow chart of a method for adjusting a vehicle seat back panel provided in an embodiment of the present application.

[0183] The vehicle seat back adjustment method provided in the embodiments of the present application is applied to the vehicle seat system introduced in the above embodiments.

[0184] The adjustment methods for the vehicle seat back include:

[0185] S1101: After the seat back is deflected, the current position of the upper link and the current position of the lower link are obtained.

[0186] S1102: Set the back plate target position, and obtain the upper link target position and the lower link target position corresponding to the back plate target position.

[0187] Since the lengths of the upper and lower links are fixed, and the upper and lower slider assemblies are fixed to the seat back, the angle of the seat back no longer changes after the deflection is completed, and the upper and lower slider assemblies slide along the straight line where the seat back is located; therefore, the corresponding upper and lower link target positions can be determined by setting the backboard target position.

[0188] S1103: Obtain the displacement of the upper slider according to the current position of the upper link and the target position of the upper link; obtain the displacement of the lower slider according to the current position of the lower link and the target position of the lower link.

[0189] S1104: Adjust the target position of the back plate so that the total displacement of the sum of the displacement of the upper slider and the displacement of the lower slider is the shortest.

[0190] S1105: Control the upper slider assembly to move according to the upper slider displacement when the total displacement is the shortest; control the lower slider assembly to move according to the lower slider displacement when the total displacement is the shortest; and control the azimuth angle of the lower connecting rod to be the angle corresponding to the target position of the lower connecting rod when the total displacement is the shortest.

[0191] Since the adjustment is performed according to the angle of the upper slider displacement, the lower slider displacement and the target position of the lower link corresponding to the shortest total displacement, the displacement is minimized during the adjustment process, the occupied space is also minimized, and the impact on surrounding people and objects is small, thereby improving the comfort and convenience of using the vehicle seat back.

[0192] In some embodiments, step S1102 may be implemented as follows:

[0193] S1121: Set the backplane target position;

[0194] S1122: Obtain the upper link target position and the lower link target position corresponding to the backboard target position based on the backboard target position, the deflection angle of the seat back, the length of the upper link, the length of the lower link, and the backboard axis width; the backboard axis width is the width between the upper link fixed axis and the lower link fixed axis.

[0195] In some embodiments, the seat includes a seat back rotation axis; the connection between the upper link and the upper slider assembly is the first rotation center; the connection between the lower link and the lower slider assembly is the second rotation center; the positions of the upper link, lower link, and back plate can be represented as follows:

[0196] Establish a plane rectangular coordinate system with the side of the seat as the plane and the center of the seat back rotation axis as the origin;

[0197] In the coordinate system, the position of the upper link is represented by the coordinates of the first rotation center and the coordinates of the fixed axis of the upper link; the position of the lower link is represented by the coordinates of the second rotation center and the coordinates of the fixed axis of the lower link; the position of the back plate is represented by the coordinates of the fixed axis of the upper link and the coordinates of the fixed axis of the lower link.

[0198] When the coordinate system is used to represent the position of each structure, step S1122 can be further implemented as follows:

[0199] S1201: Establishing a first positional relationship between a first rotation center and a second rotation center based on an initial angle between the seat back and the coordinate axis, a deflection angle of the seat back, and an offset between the center of the slider and the seat rotation axis;

[0200] S1202: Establishing a second positional relationship between the first rotation center and the fixed axis of the upper link according to the length and the azimuth angle of the upper link;

[0201] S1203: Establishing a third positional relationship between the second rotation center and the fixed axis of the lower link according to the length and the azimuth angle of the lower link;

[0202] S1204: Establishing a fourth positional relationship between the upper link fixed axis and the lower link fixed axis according to the back plate axis width and the azimuth angle of the back plate;

[0203] S1205: Based on the first positional relationship, the second positional relationship, the third positional relationship, and the fourth positional relationship, obtain the relationship between the coordinates of the first rotation center, the coordinates of the second rotation center, and the target position of the backplane.

[0204] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0205] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vehicle seat system, characterized in that: include: Seat, back panel, upper slider assembly, lower slider assembly, upper connecting rod, lower connecting rod, drive motor and controller; The upper slider assembly and the lower slider assembly are both fixed to the seat back of the seat; The first end of the upper connecting rod is connected to the upper slider assembly; the second end of the upper connecting rod is connected to the upper connecting rod fixing shaft of the back plate; The first end of the lower connecting rod is connected to the lower slider assembly; the second end of the lower connecting rod is connected to the lower connecting rod fixing shaft of the back plate; The controller is used to: After the seat back is deflected, obtaining a current position of the upper connecting rod and a current position of the lower connecting rod; Setting a backplate target position, and obtaining an upper link target position and a lower link target position corresponding to the backplate target position; Obtaining the displacement of the upper slider according to the current position of the upper connecting rod and the target position of the upper connecting rod; Obtaining a displacement of the lower slider according to the current position of the lower link and the target position of the lower link; Adjusting the target position of the back plate so that the total displacement of the upper slider and the lower slider is the shortest; controlling the driving motor to move the upper slider assembly according to the upper slider displacement when the total displacement is the shortest; controlling the driving motor to move the lower slider assembly according to the displacement of the lower slider when the total displacement is the shortest; The driving motor is controlled so that the azimuth angle of the lower link is an angle corresponding to the target position of the lower link when the total displacement is the shortest.

2. The system according to claim 1, wherein: The controller is specifically used to obtain the upper connecting rod target position and the lower connecting rod target position corresponding to the back panel target position based on the back panel target position, the deflection angle of the chair back, the length of the upper connecting rod, the length of the lower connecting rod and the back panel axis width; the back panel axis width is the width between the upper connecting rod fixed axis and the lower connecting rod fixed axis.

3. The system according to claim 2, characterized in that The seat includes a seat back rotation axis; the connection between the upper connecting rod and the upper slider assembly is the first rotation center; the connection between the lower connecting rod and the lower slider assembly is the second rotation center; The controller is specifically used for: Establishing a plane rectangular coordinate system with the side surface of the seat as a plane and the center of the seat back rotation axis as the origin; In the coordinate system, the position of the upper link is represented by the coordinates of the first rotation center and the coordinates of the upper link fixed axis; the position of the lower link is represented by the coordinates of the second rotation center and the coordinates of the lower link fixed axis; the position of the back plate is represented by the coordinates of the upper link fixed axis and the coordinates of the lower link fixed axis.

4. The system according to claim 3, characterized in that The controller is specifically used for: establishing a first positional relationship between the first rotation center and the second rotation center based on an initial angle between the seat back and the coordinate axis, a deflection angle of the seat back, and an offset between a center of a slider and a seat rotation axis; establishing a second positional relationship between the first rotation center and the fixed axis of the upper link according to the length of the upper link and the azimuth angle of the upper link; establishing a third positional relationship between the second rotation center and the fixed axis of the lower link according to the length of the lower link and the azimuth angle of the lower link; establishing a fourth positional relationship between the upper link fixing axis and the lower link fixing axis according to the back plate axis width and the azimuth angle of the back plate; Based on the first positional relationship, the second positional relationship, the third positional relationship, and the fourth positional relationship, a relationship between the coordinates of the first rotation center, the coordinates of the second rotation center, and the back plate target position is obtained.

5. The system according to any one of claims 1 to 4, characterized in that: One side of the back panel is used as a small table top; the other side of the back panel is used as a display screen; When the back panel is used as a display screen, the controller is further used to control the lower slider assembly and the upper slider assembly so that the lower connecting rod fixed axis is higher than the upper connecting rod fixed axis.

6. The system according to any one of claims 1 to 4, characterized in that: The upper slider assembly specifically includes a first upper slider assembly and a second upper slider assembly; the lower slider assembly specifically includes a first lower slider assembly and a second lower slider assembly; the upper connecting rod specifically includes a first upper connecting rod and a second upper connecting rod; the lower connecting rod specifically includes a first lower connecting rod and a second lower connecting rod; The drive motor specifically includes: a first drive motor, a second drive motor and a third drive motor; The first upper slider assembly, the second upper slider assembly, the first lower slider assembly, and the second lower slider assembly are all fixed to the seat back of the seat; The first end of the first upper connecting rod is connected to the first upper slider assembly, and the second end of the first upper connecting rod is connected to the first end of the upper connecting rod fixed shaft; The first end of the second upper connecting rod is connected to the second upper slider assembly, and the second end of the second upper connecting rod is connected to the second end of the upper connecting rod fixed shaft; The first end of the first lower connecting rod is connected to the first lower slider assembly, and the second end of the first lower connecting rod is connected to the first end of the lower connecting rod fixed shaft; The first end of the second lower connecting rod is connected to the second lower slider assembly, and the second end of the second lower connecting rod is connected to the second end of the lower connecting rod fixed shaft; The first drive motor is used to control the displacement of the first lower slider assembly; the second drive motor is used to control the azimuth angle of the lower connecting rod; and the third drive motor is used to control the displacement of the first upper slider assembly.

7. The system according to claim 6, characterized in that The first lower slider assembly specifically includes: a lower slider shaft, a first bearing, a second bearing, a lower slider gear, a lower slider rack, a first lower slider and a first lower slider guide rail; The first driving motor is connected to the lower slider shaft by a key; the lower slider shaft is connected to the lower slider gear by a key; The lower slider shaft is connected to the first lower connecting rod through the first bearing; the lower slider shaft is connected to the first lower slider through the second bearing; the first lower slider and the first lower slider guide rail are connected by a moving pair; the first lower slider guide rail, the lower slider rack and the seat are fixedly connected.

8. The system according to claim 6, characterized in that The second lower slider assembly specifically includes: a lower connecting rod shaft, a third bearing, a second lower slider and a second lower slider guide rail; The second drive motor is connected to the lower connecting rod shaft by a key; the lower connecting rod shaft is connected to the second lower connecting rod by a key; The lower connecting rod shaft is connected to the second lower slider through the third bearing; the second lower slider and the second lower slider guide rail are connected by a moving pair; the second lower slider guide rail and the seat are fixedly connected.

9. A method for adjusting a vehicle seat backboard, characterized in that: Applicable to a vehicle seat system, the system comprising: a seat, a back panel, an upper slider assembly, a lower slider assembly, an upper connecting rod, a lower connecting rod, a drive motor, and a controller; The upper slider assembly and the lower slider assembly are both fixed to the seat back of the seat; The first end of the upper connecting rod is connected to the upper slider assembly; the second end of the upper connecting rod is connected to the upper connecting rod fixing shaft of the back plate; The first end of the lower connecting rod is connected to the lower slider assembly; the second end of the lower connecting rod is connected to the lower connecting rod fixing shaft of the back plate; The method comprises: After the seat back is deflected, obtaining a current position of the upper connecting rod and a current position of the lower connecting rod; Setting a backplate target position, and obtaining an upper link target position and a lower link target position corresponding to the backplate target position; Obtaining the displacement of the upper slider according to the current position of the upper link and the target position of the upper link; obtaining the displacement of the lower slider according to the current position of the lower link and the target position of the lower link; Adjusting the target position of the back plate so that the total displacement of the upper slider and the lower slider is the shortest; The upper slider assembly is controlled to move according to the upper slider displacement when the total displacement is the shortest; the lower slider assembly is controlled to move according to the lower slider displacement when the total displacement is the shortest; and the azimuth angle of the lower connecting rod is controlled to be the angle corresponding to the target position of the lower connecting rod when the total displacement is the shortest.

10. The method according to claim 9, characterized in that The obtaining of the upper connecting rod target position and the lower connecting rod target position corresponding to the back plate target position specifically includes: According to the backboard target position, the deflection angle of the chair back, the length of the upper link, the length of the lower link and the backboard axis width, the upper link target position and the lower link target position corresponding to the backboard target position are obtained; the backboard axis width is the width between the upper link fixed axis and the lower link fixed axis.

11. The method according to claim 10, characterized in that The seat includes a seat back rotation axis; the connection between the upper connecting rod and the upper slider assembly is the first rotation center; the connection between the lower connecting rod and the lower slider assembly is the second rotation center; The positions of the upper link, the lower link, and the back plate are represented as follows: Establishing a plane rectangular coordinate system with the side surface of the seat as a plane and the center of the seat back rotation axis as the origin; In the coordinate system, the position of the upper link is represented by the coordinates of the first rotation center and the coordinates of the upper link fixed axis; the position of the lower link is represented by the coordinates of the second rotation center and the coordinates of the lower link fixed axis; the position of the back plate is represented by the coordinates of the upper link fixed axis and the coordinates of the lower link fixed axis.

12. The method according to claim 11, characterized in that The obtaining of the upper connecting rod target position and the lower connecting rod target position corresponding to the back plate target position specifically includes: establishing a first positional relationship between the first rotation center and the second rotation center based on an initial angle between the seat back and the coordinate axis, a deflection angle of the seat back, and an offset between a center of a slider and a seat rotation axis; establishing a second positional relationship between the first rotation center and the fixed axis of the upper link according to the length of the upper link and the azimuth angle of the upper link; establishing a third positional relationship between the second rotation center and the fixed axis of the lower link according to the length of the lower link and the azimuth angle of the lower link; establishing a fourth positional relationship between the upper link fixing axis and the lower link fixing axis according to the back plate axis width and the azimuth angle of the back plate; Based on the first positional relationship, the second positional relationship, the third positional relationship, and the fourth positional relationship, a relationship between the coordinates of the first rotation center, the coordinates of the second rotation center, and the back plate target position is obtained.

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