Seat assembly, seat assembly control method, and vehicle

Abstract

The present invention discloses a seat assembly, a control method for a seat assembly, and a vehicle, comprising: a seat back; a headrest, wherein the headrest comprises two headrest units, the two headrest units being movably mounted on the seat back, the headrest having an open state and a folded state, and both headrest units move to the rear side of the seat back in the folded state; a locking module, wherein the locking module is used to lock the two headrest units in the open state; a driving module, wherein the driving module is connected to the two headrest units and is used to drive the two headrest units to switch between the open state and the folded state; and a control module, wherein the control module is electrically connected to the locking module and the driving module. According to an embodiment of the present invention, the seat assembly comprises two headrest units that are movable relative to the seat back, thereby improving the flexibility of the headrest, and the headrest units are driven to move to the rear side of the seat back by the provided driving module, thereby ensuring that the seat back can be horizontally connected to the rear seat.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle manufacturing, and in particular to a seat assembly, a control method for the seat assembly, and a vehicle having the seat assembly. Background Art

[0002] Seat headrests, also known as cushions, are auxiliary devices designed to enhance comfort and safety in conventional seats and vehicles like cars and airplanes. However, existing designs often fold headrests as a single unit. Because they typically have two connecting rods connected to the seat back, these designs restrict headrests to either vertical extension (retracting into the seat back) or forward and backward movement when folded. This not only limits the flexibility of the headrest's folding and movement, but also poses a potential safety hazard. Specifically, in the event of a horizontal collision, the sudden and powerful force could potentially pull the forward and backward securing mechanism apart, depriving the user's head of effective headrest protection and potentially causing an accident. Summary of the Invention

[0003] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a seat assembly and a control method for the seat assembly, which are used to improve the flexibility and stability of the headrest, thereby reducing safety hazards. Furthermore, the present invention enhances the intelligence level of the seat and improves occupant comfort.

[0004] According to an embodiment of the present invention, a seat assembly includes: a seat back; a headrest, wherein the headrest includes two headrest units, and the two headrest units are movably mounted on the seat back, and the headrest has an open state and a folded state, and in the folded state, the two headrest units move to the rear side of the seat back; a locking module, wherein the locking module is used to lock the two headrest units in the open state; a driving module, wherein the driving module is connected to the two headrest units and is used to drive the two headrest units to switch between the open state and the folded state; and a control module, wherein the control module is electrically connected to the locking module and the driving module.

[0005] According to an embodiment of the present invention, the headrest of the seat assembly comprises two headrest units, each of which is movable relative to the seatback, enhancing the headrest's flexibility. The occupant can transmit instructions via the control module to the drive module and the locking module, causing the locking module to lock and unlock the headrest units. The drive module then drives the headrest units to move to the rear of the seatback, ensuring a horizontal connection between the seatback and the rear seat. This flexibility also avoids the safety risks associated with headrests that can only be folded by moving forward and backward.

[0006] According to the seat assembly of an embodiment of the present invention, the seat back is provided with two movable tracks, the connecting rods of the two headrest units are respectively movably connected to the two movable tracks, and the headrest units are suitable for switching between the open state and the folded state along the movable tracks.

[0007] According to the seat assembly of an embodiment of the present invention, the movable track includes a transverse track and a longitudinal track, the longitudinal track is connected to the transverse outer end of the transverse track, the transverse tracks of the two movable tracks are opposite and spaced apart in the transverse direction, and the longitudinal tracks of the two movable tracks are parallel and spaced apart; wherein, in the open state, the connecting rod of the headrest unit is located at the inner end of the transverse track, and in the folded state, the connecting rod of the headrest unit is located at the rear end of the longitudinal track.

[0008] According to the seat assembly of an embodiment of the present invention, the locking module includes a first magnetic unit and a second magnetic unit, the first magnetic unit and the second magnetic unit are respectively located on the sides of the two headrest units close to each other, and the control module is suitable for controlling the first magnetic unit and the second magnetic unit to be energized and attracted when in the open state.

[0009] According to the seat assembly of an embodiment of the present invention, the locking module includes a first locking unit and a second locking unit, the first locking unit and the second locking unit are respectively arranged on the two headrest units, and the control module is suitable for controlling the mechanical locking of the first locking unit and the second locking unit in the open state.

[0010] The present invention also provides a control method for a seat assembly.

[0011] A control method for a seat assembly according to an embodiment of the present invention is applicable to any one of the seat assemblies described above, and the control method includes: controlling the seat back to fold backward and obtaining a falling tilt angle of the seat back; controlling a locking module to open and controlling a headrest unit to switch from an open state to a folded state when the falling tilt angle reaches a first set angle; and controlling the seat back to stop folding when the seat back falls to be level with the surface of the rear seat.

[0012] According to the control method of the seat assembly according to an embodiment of the present invention, the control method also includes: controlling the seat back to restore forward and obtaining the rising tilt angle of the seat back; controlling the headrest unit to switch from a folded state to an open state and controlling the locking module to lock when the rising tilt angle reaches a second set angle; and controlling the seat back to stop moving forward when the rising tilt angle restores to the set position.

[0013] According to the control method of the seat assembly according to an embodiment of the present invention, controlling the headrest unit to switch from the open state to the folded state includes: driving the two headrest units to move laterally in directions away from each other; controlling the two headrest units to move backward when the two headrest units move laterally to the maximum lateral position; and stopping when the two headrest units move backward to the maximum longitudinal position.

[0014] According to the control method of the seat assembly according to an embodiment of the present invention, controlling the locking module to open includes: controlling the first magnetic unit and the second magnetic unit of the locking module to magnetically engage; or controlling the first locking unit and the second locking unit of the locking module to mechanically lock.

[0015] The present invention also provides a vehicle.

[0016] A vehicle according to an embodiment of the present invention is provided with any one of the seat assemblies described above.

[0017] The vehicle and any one of the above-mentioned seat assemblies have the same advantages over the prior art, which will not be repeated here.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 is a structural diagram of a seat assembly and an automobile cabin controller module according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a front perspective structure of a headrest according to an embodiment of the present invention;

[0022] Figure 3 is a top view of a seat back according to an embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of a mechanical locking device in an open state according to an embodiment of the present invention;

[0024] Figure 5 is a schematic structural diagram of a mechanical locking device in a locked state according to an embodiment of the present invention;

[0025] Figure 6 is a schematic structural diagram of a mechanical locking device according to an embodiment of the present invention;

[0026] Figure 7is a schematic diagram of function execution logic according to an embodiment of the present invention;

[0027] Figure 8 2 is a schematic structural diagram of a clamping structure according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] Seat assembly 100,

[0030] Seat back 1, movable track 11, transverse track 111, mounting hole 1111, longitudinal track 112, headrest 2, headrest unit 21, connecting rod 22, snap-fit ​​structure 23, snap-fit ​​protrusion 231, snap-fit ​​portion 232, snap-fit ​​groove 233,

[0031] Locking module 3, first magnetic unit 31, second magnetic unit 32, first locking unit 33, second locking unit 34, driving module 4, control module 5, power module 6, wiring harness 7,

[0032] Automobile cockpit controller module 200. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0034] Reference below Figures 1-8 The seat assembly 100 according to an embodiment of the present invention includes: a seat back 1, a headrest 2, a locking module 3, a driving module 4, and a control module 5. The seat back 1 and the headrest 2 are connected by a connecting rod 22. Figure 2 As shown, the headrest 2 includes two headrest units 21. The two headrest units 21 are identical in size and structure. In actual installation, the two headrest units 21 can be symmetrically arranged. Each headrest unit 21 is connected to a connecting rod 22, allowing the headrest units 21 to be movably connected above the seat back 1 via the connecting rod 22. Furthermore, the headrest 2 can be opened and folded during operation. In the folded state, both headrest units 21 move to the rear of the seat back 1.

[0035] That is, the two headrest units 21 are symmetrically connected to form a headrest 2, which provides protection for the occupant's neck and improves occupant comfort. When the two headrest units 21 are separated, they can move independently, allowing the headrest units 21 to move relative to the seat back 1 and to the rear of the seat back 1. In other words, the relative position of the headrest units 21 and the seat back 1 changes, so that the headrest 2 will not affect the swinging of the seat back 1 after movement, thereby ensuring that the seat back 1 remains level with the rear seat surface when folded down. It can be understood that by splitting the headrest 2 into two headrest units 21, each headrest unit 21 can move relative to the seat back 1, thereby significantly improving the flexibility of the headrest 2 structure.

[0036] Furthermore, the locking module 3 is used to lock the two headrest units 21 when in the open state. In other words, the locking module 3 proposed in this embodiment can be used to lock and unlock the two headrest units 21. This allows the two headrest units 21 to be connected and disconnected by controlling the locking module 3, while ensuring the stability of the two headrest units 21 when connected.

[0037] Furthermore, the drive module 4 is connected to the two headrest units 21 and is used to drive the two headrest units 21 to switch between an open state and a folded state. That is, after the locking module 3 unlocks the two headrest units 21, the headrest units 2 are in the open state. At this point, the drive module 4 drives the two headrest units 21 to move relative to the seat back 1, allowing them to move to the rear side of the seat back 1, thereby achieving a spacing between the headrest units 21 and the seat back 1 in the Z direction. When the two headrest units 21 merge, the drive module 4 continues to drive the two headrest units 21 relative to the seat back 1, allowing them to move to the upper side of the seat back 1 to achieve reset. Continuing, the drive module 4 drives the two headrest units 21 toward each other. At this point, the locking module 3 locks the two headrest units 21 to form a complete headrest 2 structure.

[0038] In addition, the control module 5 can be designed with a button switch in the vehicle. When the occupant needs to fold down the seat back 1, the button switch can be pressed to transmit the command information of the control module 5 to the drive module 4 and the locking module 3, so that the drive module 4 and the locking module 3 perform the next operation according to the data information of the control module 5. For example, when the locking module 3 is locked or unlocked, the drive module 4 then controls the headrest unit 21 to move.

[0039] The control module 5, locking module 3, and drive module 4 are all electrically connected. That is, the control module 5, drive module 4, and lock module 3 are connected via a power harness 7, which has the advantages of fast transmission speed and relatively stable connection. The power harness 7 can also supply power to the drive module 4 and lock module 3, thereby ensuring stable operation of the entire mechanism.

[0040] In the seat assembly 100 according to the embodiment of the present invention, the headrest 2 is composed of two headrest units 21, each of which is movable relative to the seatback 1, enhancing the flexibility of the headrest 2. The occupant can transmit instructions via the control module 5 to the drive module 4 and the locking module 3, causing the locking module 3 to lock and unlock the headrest units 21. The drive module 4 then drives the headrest units 21 to move to the rear of the seatback 1, thereby ensuring horizontal connection between the seatback 1 and the rear seat. The flexibility of the headrest 2 also avoids the safety risks associated with headrests 2 that can only be folded by moving forward and backward.

[0041] In some embodiments, the contact surface between the two headrest units 21 has a snap-fit ​​structure 23. Figure 8 As shown, the engaging structure 23 includes an engaging protrusion 231 and an engaging portion 232. The engaging protrusion 231 and the engaging portion 232 are integrally formed. Specifically, the engaging portion 232 is configured as a rectangular block, and the engaging protrusion 231 is a block-shaped structure that protrudes upward or downward at the end of the engaging portion 232 facing away from the contact surface, so that an engaging groove 233 is formed between the engaging protrusion 231 and the engaging portion 232.

[0042] like Figure 8 As shown, the snap-fitting protrusions 231 of the contact surface of the left headrest unit 21 are all protruding upward in the snap-fitting portion 232, and the snap-fitting protrusions 231 of the contact surface of the right headrest unit 21 are all protruding downward in the snap-fitting portion 232, and the snap-fitting portions 232 on the left and the right are staggered, so that the snap-fitting protrusion 231 on the left can cooperate with the snap-fitting groove 233 on the right, and the snap-fitting protrusion 231 on the right can cooperate with the snap-fitting groove 233 on the left, and there are multiple snap-fitting portions 232 on both sides, so that multiple snap-fitting portions 232 on both sides can be snap-fitted, thereby realizing the snap-fitting of the entire contact surface, thereby improving the structural stability of the two headrest units 21 when closed.

[0043] In some embodiments, as Figure 3As shown, the seat back 1 is provided with two movable tracks 11. The connecting rods 22 of the two headrest units 21 are movably connected to the two movable tracks 11, respectively. The headrest units 21 are adapted to switch between an open state and a folded state along the movable tracks 11. In other words, each headrest unit 21 moves within each movable track 11, allowing the headrest unit 21 to move within the movable track 11 to achieve relative movement with the seat back 1, thereby placing the headrest 2 in either a folded state or an open state.

[0044] In some embodiments, the movable track 11 includes a transverse track 111 and a longitudinal track 112, and the longitudinal track 112 is connected to the transverse outer end of the transverse track 111. That is, the transverse track 111 and the longitudinal track 112 are bent and connected, and one end of the longitudinal track 112 is connected to the rear side of the seat back 1. Specifically, the transverse tracks 111 of the two movable tracks 11 are arranged to face each other and spaced apart in the transverse direction, and the longitudinal tracks 112 of the two movable tracks 11 are spaced apart in parallel. As a result, the two headrest units 21 can ensure consistency of movement in each other's transverse tracks 111 or longitudinal tracks 112, and the transverse tracks 111 and longitudinal tracks 112 of each movable track 11 are the same length, so that the movement paths of the headrest units 21 are the same, which is beneficial to the movement continuity of the headrest units 21 and avoids dead points.

[0045] Specifically, a connecting rod mounting hole 1111 is provided at the inner end of the transverse rail 111, and the connecting rod mounting hole 1111 can be connected to the transverse rail 111. In the open state, the connecting rod 22 of the headrest unit 21 is located at the connecting rod mounting hole 1111 at the inner end of the transverse rail 111. Under the driving action of the gears or mechanical components provided in the driving module 4, the connecting rod 22 of the headrest unit 21 can move along the movable rail 11, so that when the headrest unit 21 moves to the folded state, the connecting rod 22 of the headrest unit 21 will move to the rear end of the longitudinal rail 112.

[0046] Among them, the connecting rod mounting hole 1111 is connected to the inner end of the transverse rail 111, and the connection between the connecting rod 22 and the inner end of the transverse rail 111 is set at a certain angle, so that the movement of the connecting rod 22 in the front and rear directions is restricted, thereby ensuring that the connecting rod 22 will not move in the front and rear directions after the vehicle is subjected to a violent collision, thereby avoiding causing secondary injuries to the occupants.

[0047] In some embodiments, the locking module 3 includes a first magnetic unit 31 and a second magnetic unit 32, respectively located on the sides of the two headrest units 21 adjacent to each other. The control module 5 is adapted to control the first magnetic unit 31 and the second magnetic unit 32 to be electrically engaged when in the open state. In other words, the first magnetic unit 31 and the second magnetic unit 32 together form a magnetic engagement device, each configured as a combination of magnets or electromagnets. When the magnetic engagement device is energized, the current is converted to generate an electromagnetic force, enabling a secure connection between the first magnetic unit 31 and the second magnetic unit 32. The control module 5 can control the magnitude of the current to flexibly control the engagement force of the magnetic engagement device. For example, when the control module 5 controls the current magnitude to "0," the engagement force is zero, and the two headrest units 21 are unlocked, allowing the drive module 4 to drive the headrest units 21 to move.

[0048] In other embodiments, Figure 4 As shown, the locking module 3 includes a first locking unit 33 and a second locking unit 34, which are respectively arranged on the sides of the two headrest units 21 close to each other, and the control module 5 is adapted to control the first locking unit 33 and the second locking unit 34 to be mechanically locked in the open state. Figure 5 As shown, the first locking unit 33 and the second locking unit 34 together constitute a mechanical locking device. The first locking unit 33 and the second locking unit 34 are both constructed as U-shaped mechanical lock spring structures, and the first locking unit 33 and the second locking unit 34 are symmetrically arranged on the side surfaces of the headrest unit 21. Specifically, when the two headrest units 21 need to be locked, the groove surfaces of the first locking unit 33 and the second locking unit 34 are engaged with each other to complete the locking state. In actual installation, as shown in FIG. Figure 6 As shown, multiple sets of mechanical locking devices can be provided to ensure force balance and structural stability of the entire contact surface.

[0049] In some embodiments, the seat assembly 100 further includes a power module 6, which can be installed within the seat assembly 100 or positioned elsewhere within the vehicle. The power module 6 is electrically connected to the drive module 4, the locking module 3, the control module 5, and the like via a power harness 7, thereby providing power to the headrest units 21, the drive module 4, the locking module 3, and the control module 5. The control module 5 regulates the current flowing through the power module 6 to maintain electromagnetic attraction between the two headrest units 21 in different states of the headrest 2. The attraction can be positively correlated with vehicle speed; for example, higher speeds result in greater attraction, and vice versa. Thus, current regulation ensures the structural stability of the two headrest units 21 and prevents separation in the event of a collision.

[0050] The present invention also provides a control method for the seat assembly 100 .

[0051] The control method of the seat assembly 100 according to the embodiment of the present invention is applicable to any of the above-mentioned seat assemblies 100. Figure 7 As shown, the control method includes the following steps in setting the seat assembly 100 in a reclining process from a vertical state to a horizontal state:

[0052] S1: Control the seat back 1 to fold backward and obtain the falling tilt angle of the seat back 1;

[0053] S2: When the falling tilt angle reaches a first set angle, the locking module 3 is controlled to open and the headrest unit 21 is controlled to switch from the open state to the folded state;

[0054] S3: When the seat back 1 falls down to be level with the surface of the rear seat, the seat back 1 is controlled to stop being folded down.

[0055] In some embodiments, as Figure 7 As shown, the control method further includes the steps of setting the seat assembly 100 in a reset process from a horizontal state to a vertical state:

[0056] S4: Control the seat back 1 to return forward and obtain the upward tilt angle of the seat back 1;

[0057] S5: When the rising tilt angle reaches a second set angle, the headrest unit 21 is controlled to switch from the folded state to the unfolded state and the locking module 3 is controlled to lock;

[0058] S6: When the upward tilt angle returns to the set position, the seat back 1 is controlled to stop moving forward.

[0059] In some embodiments, the step of controlling the headrest unit 21 to switch from the open state to the folded state is as follows:

[0060] S21: driving the two headrest units 21 to move laterally away from each other;

[0061] S22: When the two headrest units 21 move laterally to the maximum lateral position, the two headrest units 21 are controlled to move backward;

[0062] S23: The two headrest units 21 stop when they move rearward to their maximum longitudinal positions.

[0063] And, the step of controlling the headrest unit 21 to switch from the folded state to the unfolded state:

[0064] S51: driving the two headrest units 21 to move from the rear ends toward the front ends in the longitudinal guide rails;

[0065] S52: driving the two headrest units 21 to move along the longitudinal track 112 to a maximum value;

[0066] S53: Control the two headrest units 21 to move toward the transverse track 111 and stop when the movement reaches the maximum value;

[0067] In some embodiments, controlling the locking module 3 to open includes:

[0068] In the embodiment of electromagnetic attraction S61 : controlling the first magnetic attraction unit 31 and the second magnetic attraction unit 32 of the locking module 3 to be magnetically attracted;

[0069] In the mechanical locking embodiment S62 , the first locking unit 33 and the second locking unit 34 of the locking module 3 are controlled to be mechanically locked.

[0070] The present invention also provides a vehicle.

[0071] The vehicle according to the embodiment of the present invention includes a vehicle cabin controller module 200. It should be noted that, if Figure 1 As shown, the vehicle cabin controller module 200 has visual recognition and pressure sensing capabilities, which are used to execute the "autonomous learning algorithm" configured in the control module 5. The main function of this algorithm is that when the function is first used, the sensors under the vehicle cabin control module 5 will use visual or pressure methods to determine and analyze the angle at which the front seats must be reclined to trigger the automatic folding of the two headrest units 21, and then memorize this angle to complete data backup.

[0072] In this way, if the headrest 2 is not adjusted later, the folding function of the headrest 2 will be triggered according to the above-mentioned memorized angle. Through this "autonomous learning algorithm", the headrest 2 can be folded while the front seat back 1 is being reclined. This saves the waiting time of the headrest 2 starting to fold when the seat is reclined, thereby improving the user experience. In addition, if the function needs to be used again after adjusting the seat back 1 angle, the vehicle cabin controller module 200 can be turned on again to achieve another data backup.

[0073] A vehicle according to an embodiment of the present invention is provided with a seat assembly 100 according to any of the above-mentioned items. Two headrest units 21 are provided that are movable relative to the seat back 1. When an occupant needs to adjust the seat back 1, the headrest units 21 can be adjusted relative to the seat back 1 through the combined action of the control module 5, the drive module 4, and the locking module 3, thereby achieving a completely level position between the seat back 1 and the rear seat. This also improves the flexibility of the headrest 2. The headrest units 21 are connected via a magnetic unit, which effectively improves the stability of the connection. The control module 5 controls the suction force by controlling the current, which facilitates precise control of the force and thus adjustment of the suction force. Furthermore, through the coordination of the control module 5 and the vehicle cabin controller, the "autonomous learning algorithm" is utilized to effectively improve the intelligence level of the seat assembly 100, thereby shortening the occupant's waiting time and improving comfort.

[0074] 1. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0075] 2. In the description of the present invention, "first feature" and "second feature" may include one or more of these features.

[0076] 3. In the description of the present invention, “plurality” means two or more.

[0077] 4. In the description of the present invention, a first feature being “above” or “below” a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but via another feature therebetween.

[0078] 5. In the description of the present invention, the phrases “above”, “above” and “above” a first feature to a second feature include the first feature being directly above and obliquely above the second feature, or simply indicate that the first feature is horizontally higher than the second feature.

[0079] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0080] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A seat assembly, characterized in that: include: Seat back (1); A headrest (2), the headrest (2) comprising two headrest units (21), the two headrest units (21) being movably mounted on the seat back (1), the headrest (2) having an open state and a folded state, and in the folded state, the two headrest units (21) both move to the rear side of the seat back (1); A locking module (3), the locking module (3) being used to lock the two headrest units (21) in the open state; a driving module (4), the driving module (4) being connected to the two headrest units (21) and being used to drive the two headrest units (21) to switch between the open state and the folded state; A control module (5), the control module (5) being electrically connected to the locking module (3) and the driving module (4); The seat back (1) is provided with two movable tracks (11), the connecting rods (22) of the two headrest units (21) are respectively movably connected to the two movable tracks (11), and the headrest unit (21) is suitable for switching between the open state and the folded state along the movable tracks (11); The movable track (11) comprises a transverse track (111) and a longitudinal track (112), wherein the longitudinal track (112) is connected to the transverse outer end of the transverse track (111), the transverse tracks (111) of the two movable tracks (11) are arranged opposite to each other and spaced apart in the transverse direction, and the longitudinal tracks (112) of the two movable tracks (11) are spaced apart in parallel.

2. The seat assembly according to claim 1, characterized in that: In the open state, the connecting rod (22) of the headrest unit (21) is located at the inner end of the transverse track (111), and in the folded state, the connecting rod (22) of the headrest unit (21) is located at the rear end of the longitudinal track (112).

3. The seat assembly according to claim 1, characterized in that: The locking module (3) comprises a first magnetic unit (31) and a second magnetic unit (32), wherein the first magnetic unit (31) and the second magnetic unit (32) are respectively located on the sides of the two headrest units (21) close to each other, and the control module (5) is suitable for controlling the first magnetic unit (31) and the second magnetic unit (32) to be energized and attracted in the open state.

4. The seat assembly according to claim 1, wherein: The locking module (3) comprises a first locking unit (33) and a second locking unit (34), the first locking unit (33) and the second locking unit (34) being respectively provided on the two headrest units (21), and the control module (5) is adapted to control the mechanical locking of the first locking unit (33) and the second locking unit (34) in the open state.

5. A method for controlling a seat assembly, characterized in that: Applicable to the seat assembly according to any one of claims 1 to 4, the control method comprises: Controlling the seat back (1) to fold backward and obtaining the falling tilt angle of the seat back (1); When the falling tilt angle reaches a first set angle, the locking module (3) is controlled to open and the headrest unit (21) is controlled to switch from an open state to a folded state; When the seat back (1) falls to the same level as the surface of the rear seat, the seat back (1) is controlled to stop falling down.

6. The control method of the seat assembly according to claim 5, characterized in that: The control method further includes: Controlling the seat back (1) to return forward and obtaining the upward tilt angle of the seat back (1); When the rising tilt angle reaches a second set angle, the headrest unit (21) is controlled to switch from a folded state to an opened state and the locking module (3) is controlled to lock; When the rising tilt angle returns to the set position, the seat back (1) is controlled to stop moving forward.

7. The control method of the seat assembly according to claim 5, characterized in that: Controlling the headrest unit (21) to switch from an open state to a folded state includes: driving the two headrest units (21) to move laterally in directions away from each other; When the two headrest units (21) move laterally to a maximum lateral position, controlling the two headrest units (21) to move backward; The two headrest units (21) stop when they move rearward to their maximum longitudinal position.

8. The control method of the seat assembly according to claim 5, characterized in that: The control locking module (3) opens including: Controlling the magnetic attraction of the first magnetic attraction unit (31) and the second magnetic attraction unit (32) of the locking module (3); Or the first locking unit (33) and the second locking unit (34) of the locking module (3) are controlled to be mechanically locked.

9. A vehicle, characterized in that: A seat assembly according to any one of claims 1 to 4 is provided.

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