Safety seat rotation and pitch drive control method and safety seat using same

Abstract

A safety seat rotation and pitch drive control method and a safety seat (100) using same. In the method, a first motor (121) drives a lead screw (122) and a nut (124) to achieve linear displacement so as to drive a seat body (10) to perform pitch adjustment, and a second motor (214) drives, by means of gear engagement between a drive plate (213) and a turntable (212), the seat body (10) to perform rotation adjustment. In addition, working currents of the two motors are collected and calculated to obtain a current change rate, and when the current change rate exceeds a preset value, the two motors are controlled to perform an emergency stop to avoid injury to children.

Description

Safety seat rotation and pitch drive control method and its safety seat Technical Field

[0001] This invention belongs to the field of child safety seats, specifically relating to a method for controlling the rotation and pitch of a child safety seat, and a child safety seat. Background Technology

[0002] Child safety seats are crucial for improving the safety of minors riding in cars, significantly reducing the likelihood of injury to children in traffic accidents. However, in daily use, children of different heights and weights have varying seating requirements, and conventional child safety seats are not ideal for children getting in and out of vehicles. Therefore, it is necessary to design child safety seats that can rotate and have adjustable tilt angles. However, different structures have different implementation methods and stability. Considering the widespread adoption of child safety seats, their structure should be easy to manufacture and have good stability in use.

[0003] In addition, rotating or tilting the car seat after a child is seated may cause injury to the child due to the child's movements or hands and feet getting stuck. Although adults can manually stop it to reduce the possibility of injury, it may not be noticed in time due to human negligence. Technical issues

[0004] The purpose of this invention is to provide a method for controlling the rotation and pitch drive of a safety seat that is stable in operation and easy to manufacture, as well as the safety seat itself.

[0005] More preferably, the safety seat of the present invention also has the function of safety control during rotation or pitching. Technical solutions

[0006] As a first aspect of the present invention, a method for controlling the rotation and pitch of a safety seat is provided, comprising the following steps:

[0007] A safety seat is configured to include a seat body and a base, the seat body and the base being connected to form an integral safety seat so that the safety seat can be installed or removed as a whole, the seat body being rotatable relative to the base and having an adjustable tilt angle;

[0008] The pitch movement of the seat body is driven by the first motor and transmitted through the threaded engagement between the lead screw and the nut of the drive component, so that the motor rotation drives the drive component to move in a straight line, thereby adjusting the pitch of the seat body relative to the base.

[0009] The rotation of the seat body is driven by a second motor, and the seat body rotates relative to the base through gear meshing between the drive disc and the turntable. The turntable is an external gear type turntable.

[0010] According to the safety seat rotation and pitching driving control method, the base comprises a base body and a pitching base, and the pitching base is rotatably arranged on the base body.

[0011] The pitching base comprises two first connecting members in arc or L shape, and first sliding holes and second sliding holes are arranged at two ends of each first connecting member respectively; the seat body is correspondingly provided with first connecting seats and second connecting seats, and first sliding rods and second sliding rods are fixedly arranged at first connecting holes of the first connecting seats and second connecting holes of the second connecting seats respectively, and the first sliding rods and the second sliding rods are arranged in the first sliding holes and the second sliding holes respectively.

[0012] The first sliding rod or the second sliding rod is arranged in the third connecting hole of the driving member, so that the first motor drives the first sliding rod or the second sliding rod to move linearly.

[0013] According to the safety seat rotation and pitching driving control method, the first motor is arranged in the first motor seat.

[0014] The seat body is provided with a back cavity, and the back cavity comprises a motor cavity, a motion cavity and a via hole; the first motor seat is fixedly arranged in the motor cavity, the driving member is arranged in the motion cavity, the lead screw is arranged in the via hole, and the first connecting seat is arranged at a side wall of the motion cavity.

[0015] According to the safety seat rotation and pitching driving control method, the rotation of the pitching base relative to the base body is driven by a rotation driving member, the rotation driving member comprises a connecting disc, a rotating disc, a driving disc and a second motor member, the two first connecting members are fixedly connected to the connecting disc, the rotating disc is fixedly connected to the connecting disc, the second motor member comprises a second motor and a second motor seat, the second motor is in transmission connection with the driving disc, and the driving disc is a gear and is in meshing connection with a gear of the rotating disc at an outer side of the rotating disc.

[0016] According to the safety seat rotation and pitching driving control method, the second motor and the driving disc are in transmission connection through a spline hole and a spline.

[0017] According to the safety seat rotation and pitching driving control method, the two first connecting members are fixedly connected by a connecting rod at upper ends of the two first connecting members.

[0018] According to the safety seat rotation and pitching driving control method, the working current of the first motor and / or the second motor is also collected at predetermined time intervals, the current change rate in a corresponding time period range is calculated according to the current values collected at different time points and the time difference, the first motor and / or the second motor are stopped urgently if the current change rate is greater than a preset value, and the time intervals of each collection can be the same or different.

[0019] According to the safety seat rotation and pitching driving control method, the current values of two adjacent time collection points are operated to obtain an interval current change rate, and the current values of non-adjacent time collection points are operated to obtain a cross-zone time change rate, and whether the interval current change rate and the cross-zone time change rate exceed a preset value is judged.

[0020] The working currents of the first motor and the second motor are collected simultaneously, and when the operation result of one of the working currents exceeds a preset value, the two motors are simultaneously stopped.

[0021] As a second aspect of the present application, a safety seat operated based on the above method is also provided, which has a corresponding structure and a controller. Advantages

[0022] The safety seat rotation and pitching driving control method and the safety seat thereof have the following advantages:

[0023] 1. The safety seat has a compact structure to facilitate manufacturing and has good stability after use, and can reduce procurement and maintenance costs, and facilitate the promotion of safety seats.

[0024] 2. Through the current change rate detection in the rotation or pitching adjustment process, problems can be found in time and stopped in time, and harm to children caused by rotation or pitching adjustment can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a schematic view of the safety seat of the present application in a use state, at this time the seat body is oriented to one side and is in a sitting state;

[0026] Fig. 2 is a schematic view of the safety seat of Fig. 1 in a pitching adjustment to a lying state;

[0027] Fig. 3 is a schematic view of the partial structure of the safety seat of the embodiment of Fig. 1 when the seat body is oriented forward;

[0028] Fig. 4 is a schematic view of the back structure of the seat body of the safety seat of Fig. 1 in an exploded state;

[0029] Fig. 5 is a schematic view of the partial enlargement of the seat of Fig. 4;

[0030] Fig. 6 is a schematic view of the assembly of the pitching driving member and the first sliding rod of Fig. 4;

[0031] Fig. 7 is a schematic view of the partial structure of the rotation driving member of the safety seat of the embodiment of Fig. 1 in an exploded state;

[0032] Fig. 8 is a schematic view of the structure of the driving disc and the second motor member of Fig. 7 in an exploded state;

[0033] Fig. 9 is a schematic view of the current data of the second motor for rotation of the safety seat in an embodiment of the present application;

[0034] Figure 10 is a current data diagram of the second motor for pitch adjustment of the safety seat in an embodiment of the present application.

[0035] wherein,

[0036] safety seat 100, seat body 10, base 20, seat 101, headrest 102, drawstring 103, pitch drive 12, back cavity 14, base body 21, pitch seat 22, first motor 121, screw rod 122, drive 123, nut 124, third connecting hole 125, first motor seat 126, first connecting seat 131, first connecting hole 132, second connecting seat 133, second connecting hole 134, first sliding rod 135, second sliding rod 136, motor cavity 141, action cavity 142, via hole 143, connecting disc 211, rotating disc 212, driving disc 213, second motor part 214, spline hole 215, spline 216, first connecting part 221, first sliding hole 222, second sliding hole 223, connecting rod 224. Embodiments of the present application

[0037] The technical solutions in the embodiments of the present application are clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the following embodiments are only some of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application also belong to the scope of protection of the present application.

[0038] As shown in Figures 1-2, a safety seat based on electric control, which is composed of a seat body 10 and a base 20 as a whole, the base 20 is used to be placed on the seat of a car and is preferentially fixed to the car through a safety seat interface, for example, fixed to the car through an ISOFIX interface, so that the base 20 is connected firmly and safely.

[0039] In the present embodiment, the seat body 10 is connected with the base 20 to form a whole safety seat, the user installs or removes the safety seat 100 as a whole on or from the car, and cannot only remove the seat body 10 while keeping the base 20 connected to the car, so the safety seat 10 of the present embodiment is a whole safety seat.

[0040] The seat body 10 can be rotatably moved and the pitch angle of the seat body 10 can be adjusted relative to the base 20, so that the safety seat 100 can be adjusted according to the needs of the child in the use to adjust the riding direction and the sitting or lying manner of the child, so as to meet the needs of different ages and use habits; the angle of the seat body 10 can also be rotated to facilitate the adult to take or get off the child, for example, when the child gets on or off the car (i.e. when the adult takes the child to ride on the safety seat before driving or when the adult takes the child out of the safety seat after parking), the seat body 10 can be rotated to the direction of the door, and the seat body 10 can be rotated forward or backward when the child gets on the car.

[0041] As shown in FIG. 1, the seat body 10 is composed of a seat 101, a headrest 102 and a strap 103. The seat 101 is used for the child to be wrapped and seated therein. The headrest 102 is movably arranged on the seat 101 to adjust to the different heights of the child and to support and protect the head of the child. One end of the strap 103 is connected to the seat 101, and the other end is used to be fixed to the car, for example, the other end of the strap 102 is fixed to the buckle point on the back of the car seat, so that the safety seat 100 is fixedly connected through the strap and the ISOFIX rod.

[0042] As shown in FIGS. 2-3, the base 20 includes a base body 21 and a pitch seat 22. The seat body 10 is fixedly connected to the pitch seat 22 to realize the pitch adjustment of the seat body 10. In addition, the pitch seat 22 is rotatably arranged relative to the base body 21 to realize the rotatable movement of the seat body 10 relative to the base 20. The ISOFIX interface is arranged on the base body 21 to fixedly connect the base body 21 to the car.

[0043] The pitch seat 22 includes two first connecting members 221 which are generally arc-shaped or L-shaped. Long strip-shaped first sliding holes 222 and second sliding holes 223 are respectively arranged at the two ends of the first connecting members 221. The first sliding holes 222 and the second sliding holes 223 can be straight lines or arcs. The distance between the two first connecting members 221 matches the width of the seat body 10, so that the seat body 10 can be connected to the first connecting members 221 at the left and right sides thereof, and the stability of the seat body 10 can be improved by the spaced side fixation. The first connecting members 221 are rotatably and movably connected to the base body 21 at the lower middle positions thereof. Preferably, the two first connecting members 221 are further connected by a connecting rod 224 at the upper ends thereof, i.e. the end portions of the two first connecting members 221 are fixedly connected by the connecting rod 224 near the first sliding holes 222, so that the two first connecting members 221 form a connecting stable structure at the positions away from the base body 21, so as to strengthen the overall stability of the pitch seat 22.

[0044] First connecting seat 131 and second connecting seat 133 are respectively arranged at upper and lower positions on both sides of seat 101, the position of first connecting seat 131 corresponds to first sliding hole 222, the position of second connecting seat 133 corresponds to third sliding hole 223, first connecting hole 132 and second connecting hole 134 are respectively arranged on first connecting seat 133 and second connecting seat 133, seat 101 is connected with pitching seat 22 through first sliding rod 135 and second sliding rod 136 to form a movable connection capable of pitching swing; wherein both ends of first sliding rod 135 are fixedly arranged in first connecting hole 132 and first sliding rod 135 is arranged in first sliding hole 222, both ends of second sliding rod 136 are fixedly arranged in second connecting hole 134 and second sliding rod 136 is arranged in second sliding hole 223, thus the displacement of first sliding rod 135 in first sliding hole 222 and second sliding rod 136 in second sliding hole 223 forms the guide of the pitching movement of seat body 10, at the same time, the two sliding holes can also play the role of limiting the pitching angle.

[0045] As shown in FIGS. 4-6, back cavity 14 is arranged at the bottom surface of seat 101 of seat body 10, pitching driving member 12 is arranged in back cavity 14, and pitching driving member 12 is used to act on first sliding rod 135 to realize the purpose of driving seat body 10 to pitch.

[0046] Back cavity 14 includes motor cavity 141 and action cavity 142, and through hole 143 which communicates motor cavity 141 and action cavity 142, first connecting hole 132 is arranged at both sides of action cavity 142, and through hole 143 is used to arrange screw rod 122 therein.

[0047] The pitch driving member 12 comprises a first motor 121, a screw rod 122 and a driving member 123, the driving member 123 is movably arranged along the length direction of the screw rod 122, the outer surface of the screw rod 122 is provided with a thread, the driving member 123 is provided with a nut 124, the nut 124 has an inner thread matched with the screw rod 122, one end of the screw rod 122 is drivingly connected to the output end of the first motor 121, for example, can be directly or through a speed reduction mechanism, so that the screw rod 122 can rotate under the driving of the first motor 121, so that the driving member 123 is driven to move up and down along the length direction of the screw rod 122; the other end (i.e. the upper end in the figure) of the screw rod 122 is rotatably arranged on the side wall of the action cavity 142, for example, through a bearing connection. The driving member 123 is further provided with a third connecting hole 125, and the first sliding rod 135 is arranged in the third connecting hole 125, so that the first sliding rod 135 is driven to move up and down along the length direction of the screw rod 122, and the driving member 123 can also be limited in movement through the first sliding rod 135 so that it can only move along the length direction of the screw rod 122. Preferably, the first motor 121 is installed in the first motor seat 126, and if there is a speed reduction mechanism, it can also be integrated on the first motor seat 126, and the first motor seat 126 is fixedly connected to the cavity wall of the motor cavity 141.

[0048] As shown in Figures 7-8, the base body 21 is provided with a rotating driving member (not shown in the figure), and the pitch seat 22 is rotatably connected to the base body 21 through the rotating driving member, so as to realize the rotation of the seat body 10 relative to the base 20 to adjust the orientation of the seat body 10, that is, to switch the seat body 10 between the four directions of forward, backward, door or in-car, which are 90° to each other.

[0049] The rotating driving member comprises a connecting disc 211, a rotating disc 212, a driving disc 213 and a second motor member 214, two first connecting members 221 are fixedly connected to the connecting disc 211, the rotating disc 212 is fixedly connected to the connecting disc 211, and the rotating disc 212 is an external tooth rotating disc, which is provided with a plurality of teeth on the outer side wall, the driving disc 213 is drivingly connected to the second motor member 214, and the driving disc 213 is provided with teeth matched with the rotating disc 212, the second motor member 214 is fixedly arranged on the base body 21, and the second motor member 214 comprises a second motor and a second motor seat. The second motor is operated to drive the driving disc 213 to rotate, thereby driving the rotating disc 212, the connecting disc 211 and the two first connecting members 221 to rotate together, and driving the rotating disc 212, the connecting disc 211 and the two first connecting members 221 to rotate as a whole. Preferably, the driving disc 213 is provided with a spline hole 215 to be drivingly connected with the spline 216 of the second motor member 214.

[0050] Therefore, the safety seat 100 of the embodiment has the rotation activity driven by the second motor and transmitted through the gear engagement between the driving disc 213 and the rotating disc 212, and the pitch adjustment activity driven by the first motor 121 and transmitted through the linear motion mechanism composed of the screw rod and the screw nut to drive the seat body 10 to pitch along the pitch track. The rotation driving mechanism and the linear pitch driving mechanism both have good stability and low industrial cost, and can realize accurate control of the angle / travel.

[0051] In addition to the related structure of the safety seat 100 described above, the application also provides a control method based on the motor-driven rotation activity / pitch adjustment activity. The controller (for example, a main control chip) collects the working current of the first motor 121 or the second motor and records and calculates it in real time, so as to obtain the working current change rate or the curve slope of the two motors in a preset time period through the controller operation, and then realize the purpose of emergency stop of the safety seat 100.

[0052] Because the height and weight of the children are different, or the equipment of the safety seat is aging, and the temperature or the lubricating medium and many other reasons, the resistance of the rotation activity or the pitch adjustment activity of the safety seat 100 is not the same. From the perspective of safety in use, only manual operation by the user to stop urgently is safe, and the use of current value judgment will lead to poor efficiency, for example, smaller values may cause the use of older children or trigger the emergency stop after aging, and larger values may cause injuries to younger children.

[0053] Because the motor works under the driving of the controller, after collecting the current in time and operating the current change rate or drawing the time-current curve, the curve slope is obtained and compared with the preset standard value. When the standard value is exceeded, the controller controls the two motors to stop working, so as to avoid the harm to the children caused by the rotation or pitch adjustment of the seat.

[0054] For example, in an embodiment, the controller collects the working current I m of the two motors every n seconds, and starts to operate the current change rate k

[0055] k=(I m+1 -I m ) / n ;

[0056] wherein n is any natural number, for example, 1, 2, 3, 5, 0.1, 0.01, etc. Considering that the smaller the collection interval is, the higher the cost is, therefore n is generally not too small, and 0.5-3 seconds is more appropriate; I m represents the current value collected for the mth time, I m+1 represents the current value collected for the m+1th time, and the unit of k can be A / s or mA / ms, etc. in the form of current / time ratio.

[0057] Of course, in some more preferable embodiments, the controller can save the collected data and further calculate the current change rate across time, for example, the current change rate of the m-5th and mth, or m-2nd and m+2nd, or other time segments, in addition to calculating the current change rate of the latest two collected values.

[0058] For example, as shown in FIG. 9, the working current of the second motor for rotation is collected at the same time interval, for example, 1 second, to obtain the current value I 11 -I 15 which is the rotation current in the sitting state, so the normal state current value is generally smooth, and the line of the current change rate in each time segment is close to horizontal. Under the same conditions, the measurement is repeated once, and a resistance is applied to the seat body 10 at the t3 time point, so that the current value I' 13 It can be seen that the line of the current change rate in the t2-t3 time segment is in the form of a slanted line and exceeds the preset value, and the two motors are simultaneously stopped urgently. Of course, the current change rate can also be calculated for the relatively larger t1-t3 time segment, but in this figure, it does not exceed the preset value.

[0059] Similarly, as shown in FIG. 10, the working current of the first motor for pitch adjustment is collected from the lying state to the sitting state, and under normal circumstances, I 21 -I 25 The line of the current value I 23 and I' 24 It can be seen that the current change rate in the t2-t3 time segment increases but does not exceed the preset value, and the current change rates in the t3-t4 and t2-t4 time segments of different interval lengths both show an increase and exceed the preset value, and the two motors are simultaneously stopped urgently to ensure safety.

Claims

1. A safety seat rotation and pitch drive control method, characterized by, The application relates to a safety seat (100) comprising a seat body (10) and a base (20), the seat body (10) being connected with the base (20) to form an integrated safety seat so that the safety seat (100) can be integrally installed or dismounted, and the seat body (10) being rotatably arranged and pitch-adjustably arranged relative to the base (20). The pitch movement of the seat body (10) is driven by a first motor (121) and is transmitted through the thread cooperation between a screw rod (122) and a nut (124) of a driving member (123) so as to drive the driving member (123) to linearly displace through the rotation of the motor, and drive the seat body (10) to pitch-adjust relative to the base (20). The rotation movement of the seat body (10) is driven by a second motor and is transmitted through the gear meshing between a driving disc (213) and a rotating disc (212) so as to drive the seat body (10) to rotate relative to the base (20), and the rotating disc (212) is an external-tooth rotating disc. The base (20) comprises a base body (21) and a pitch base (22), and the pitch base (22) is rotatably arranged on the base body (21).

2. The safety seat rotation and pitch drive control method of claim 1, wherein, The pitch base (22) comprises two arc-shaped or L-shaped first connecting members (221), and a first sliding hole (222) and a second sliding hole (223) are respectively arranged at two ends of each first connecting member (221); a first connecting seat (131) and a second connecting seat (133) are correspondingly arranged on the seat body (10), a first sliding rod (135) and a second sliding rod (136) are respectively fixedly arranged at a first connecting hole (132) of the first connecting seat (131) and a second connecting hole (134) of the second connecting seat (133), and the first sliding rod (135) and the second sliding rod (136) are respectively arranged in the two first sliding holes (222) and the second sliding holes (223). The first sliding rod (135) or the second sliding rod (136) is arranged in a third connecting hole (125) of the driving member (123), so that the first motor (121) drives the first sliding rod (135) or the second sliding rod (136) to linearly displace. The first motor (121) is arranged in a first motor seat (126), a back cavity (14) is arranged on the seat body (10), the back cavity (14) comprises a motor cavity (141), a movement cavity (142) and a via hole (143), the first motor seat (126) is fixedly arranged in the motor cavity (141), the driving member (123) is arranged in the movement cavity (142), the screw rod (122) is arranged in the via hole (143), and the first connecting seat (131) is arranged at a side wall of the movement cavity (142).

3. The safety seat rotation and pitch drive control method of claim 2, wherein, ​ 4. The safety seat rotation and pitch drive control method of claim 2, wherein, The rotation of the pitching seat (22) relative to the base body (21) is driven by a rotation driving member, which comprises a connecting disc (211), a rotating disc (212), a driving disc (213) and a second motor member (214). The two first connecting members (221) are fixed to the connecting disc (211), the rotating disc (212) is fixed to the connecting disc (211), the second motor member (214) comprises a second motor and a second motor base, the second motor is in transmission connection with the driving disc (213), and the driving disc (213) is a gear and is in gear meshing with the gear of the rotating disc (212) at the outer side of the rotating disc (212).

5. The safety seat rotation and pitch drive control method of claim 4, wherein, The second motor is in transmission connection with the driving disc (213) through a spline hole (215) and a spline (216).

6. The safety seat rotation and pitch drive control method of claim 2, wherein, The two first connecting members (221) are fixed to each other at the upper ends thereof by a connecting rod (224).

7. The safety seat rotation and pitch drive control method of claim 1, wherein, The working current of the first motor (121) and / or the second motor is also collected at predetermined time intervals, and the current change rate in the corresponding time period range is calculated according to the current values collected at different time points and the time difference; If the current change rate is greater than a preset value, the first motor (121) and / or the second motor is / are urgently stopped; wherein the time intervals of each collection can be the same or different.

8. The safety seat rotation and pitch drive control method of claim 7, wherein, The current values of adjacent two time collection points are operated to obtain an interval current change rate, and the current values of non-adjacent time collection points are operated to obtain a cross-zone time change rate, and whether the interval current change rate and the cross-zone time change rate exceed a preset value is judged; The working currents of the first motor (121) and the second motor are collected at the same time, and when the operation result of one of them exceeds a preset value, both of them are urgently stopped.

9. A safety seat, characterized by The safety seat operates according to the method of any one of claims 1-8. The safety seat operates according to the method of any one of claims 1-8.

Images