A child safety seat with an intelligent retracting device and its pre-tension control method

Abstract

The present invention provides a child safety seat with an intelligent retracting device and a pre-tightening control method therefor. The pre-tightening control method includes: obtaining the composite motion data of the child safety seat and the current speed data of the driving vehicle, and dynamically calculating a composite collision risk index; when the composite collision risk index exceeds a preset safety boundary value, controlling the retracting device to execute a first protection response strategy; obtaining the legal speed limit data of the section where the driving vehicle is located, and triggering the deployment of the side wing protection device when it is detected that the driving vehicle is in an overspeed state or the current speed data is greater than a preset safety speed; after the first protection response strategy is executed, dynamically adjusting the buffer protection strategy according to the current speed data and the composite motion data. The technical problem solved by this application is that although existing child seats can reduce most injuries, in the event of a high-speed or offset collision, they may not be able to fix the violent forward movement of the child occupant's body, resulting in insufficient protection for the occupant.

Description

Technical Field

[0001] The present invention relates to the technical field of child seats, and in particular, to a child safety seat with an intelligent retractor device and a pre-tightening control method therefor. Background Art

[0002] In recent years, with the popularization and development of the transportation industry, the travel safety of children as special occupants has become an important research topic in the field of road traffic safety. Statistical data shows that the injury rate of minors aged 3 - 12 in traffic accidents is 47% higher than that of adults, and their casualties mostly result from the mismatch between the occupant restraint system and the physiological structure of children. Specifically, the traditional three-point seat belt is designed based on adult ergonomics, and there are significant adaptation contradictions with the immature musculoskeletal system of children; the adult seat belt may strangle a child's neck or injure internal organs during a collision. The existing child safety seats in the prior art use a five-point seat belt to fix children, thereby achieving the protection of children.

[0003] However, there are at least one of the following problems in the related art: Although the existing child seats can reduce most of the injuries, in the event of a high-speed or offset collision, they may not be able to fix the violent forward movement of the child occupant's body, resulting in insufficient protection for the occupant. Summary of the Invention

[0004] The technical problem solved by the present invention is that although the existing child seats can reduce most of the injuries, in the event of a high-speed or offset collision, they may not be able to fix the violent forward movement of the child occupant's body, resulting in insufficient protection for the occupant.

[0005] To solve the above problems, the present invention provides a pre-tightening control method for a child safety seat with an intelligent retractor device. The child safety seat is installed in a vehicle. The child safety seat includes a retractor device and a side wing protection device. The pre-tightening control method includes: obtaining the composite motion data of the child safety seat and the current speed data of the vehicle, and dynamically calculating a composite collision risk index; when the composite collision risk index exceeds a preset safety boundary value, controlling the retractor device to execute a first protection response strategy; obtaining the legal speed limit data of the road section where the vehicle is located, and when it is detected that the vehicle is in an overspeed state or the current speed data is greater than a preset safety speed, triggering the side wing protection device to deploy; after the first protection response strategy is executed, dynamically adjusting a buffer protection strategy according to the current speed data and the composite motion data.

[0006] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: By obtaining the composite motion data of the child safety seat and the current speed data of the driving vehicle, and dynamically calculating the composite collision risk index and comparing it with the preset safety boundary value, it is possible to more accurately determine whether there is a collision risk in the driving vehicle, reducing the possibility of false positives and false negatives. At the same time, after determining that there is a collision risk, the retractor device is controlled to execute the first protection response strategy. When it is detected that the driving vehicle is in an overspeed state or the current speed data is greater than the preset safety speed, the side wing protection device is triggered to deploy, which can better restrain the occupant before a collision occurs, thereby providing timely protection to the occupant and avoiding the violent forward impact of the occupant. After the first protection response strategy is executed, the buffer protection strategy is dynamically adjusted according to the current speed data and the composite motion data, which can better cope with different collision situations and effectively absorb and disperse the impact force generated by the collision.

[0007] In an example of the present invention, the driving vehicle is built-in with a CAN bus, and the child safety seat includes a three-axis acceleration sensor and a gyroscope sensor. Obtaining the composite motion data of the child safety seat and the current speed data of the driving vehicle, and dynamically calculating the composite collision risk index, including: obtaining the three-axis acceleration data of the child safety seat through the three-axis acceleration sensor, obtaining the yaw angular velocity data of the child safety seat through the gyroscope sensor, and obtaining the current speed data through the CAN bus; adopting a synchronous compensation strategy for the three-axis acceleration data and the yaw angular velocity data through a clock error model, and calculating the composite collision risk index in combination with the current speed data; the calculation of the composite collision risk index satisfies the following formula 1; where formula 1 is: P = k1*(a x 2 + a y 2 + a z 2 ) 1 / 2 + k2*V + k3*Ω 2 ; where a x , a y and a z are respectively the three components of the three-axis acceleration data after adopting the synchronous compensation strategy; V is the current speed data; Ω is the yaw angular velocity data after adopting the synchronous compensation strategy; P is the composite collision risk index, k1 = 0.2, k2 = 0.05, k3 = 0.1.

[0008] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: In the traditional method, due to the single data source, the calculation of the composite collision risk index is inaccurate. In the present invention, triaxial acceleration data is obtained through a triaxial acceleration sensor, yaw angular velocity data is obtained through a gyroscope sensor, and the current speed data is obtained through a CAN bus. Then, a synchronous compensation strategy is adopted for the triaxial acceleration data and the yaw angular velocity data by using a clock error model, and the composite collision risk index is calculated in combination with the current speed data, solving the problem of time-base drift between multi-sensor samplings, improving the accuracy of data acquisition and processing, reducing the situations of misjudgment and missed judgment, and thus providing more reliable data support for collision risk judgment.

[0009] In an example of the present invention, the child safety seat is further provided with an inflatable buffer assembly; the buffer protection strategy is dynamically adjusted according to the current speed data and the composite motion data, including: if the current speed data reaches the high-speed interval threshold, activating the full-inflation mode of the inflatable buffer assembly; when it is detected that the current speed data drops to the safe speed threshold and the composite value of the triaxial acceleration data is less than the preset safe acceleration value, controlling the inflatable buffer assembly to execute a pressure gradient release strategy; when it is detected that the composite value of the triaxial acceleration data drops to zero and the current speed data drops to zero, controlling the inflatable buffer assembly to execute an exhaust reset strategy.

[0010] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: In the traditional method, the buffer protection strategy cannot be adjusted specifically according to the current speed data and the triaxial acceleration data; this method dynamically adjusts the buffer protection strategy according to the current speed data and the composite motion data, improving the specificity and effectiveness of the buffer protection; in the case of a high-speed collision, more effective buffer protection measures are required. This method activates the full-inflation mode of the inflatable buffer assembly when the current speed data reaches the high-speed interval threshold, providing a stronger protection effect; in the case of a low-speed collision, over-inflation of the buffer assembly may cause resource waste and unnecessary injuries. This method controls the inflatable buffer assembly to execute a pressure gradient release strategy when it is detected that the current speed data drops to the safe speed threshold and the composite value of the triaxial acceleration data is less than the preset safe acceleration value, realizing reasonable control of the buffer assembly.

[0011] In an example of the present invention, before dynamically adjusting the buffer protection strategy according to the current speed data and the composite motion data, the pre-tightening control method further includes: obtaining the head image data of the occupant, generating the head orientation data of the occupant according to the head image data; determining the pop-up position of the inflatable buffer assembly according to the head orientation data.

[0012] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: In the existing method, the buffer protection strategy cannot be adjusted personalized according to the specific posture or position of the occupant, resulting in poor buffering effect; In this method, by obtaining the head image data of the occupant, generating the head orientation data according to the head image data, and determining the pop-up position of the inflatable buffer component according to the head orientation data, the personalized adjustment of the buffer protection strategy is realized, ensuring that the buffer component can better protect the key parts of the occupant and improving the buffering effect.

[0013] In an example of the present invention, the retractor is connected to the seat belt in the child safety seat, and the driving vehicle includes a panoramic imaging system; Controlling the retractor to execute the first protection response strategy includes: Controlling the retractor to tighten the seat belt at a basic rate until the seat belt is in complete contact with the body surface of the occupant; When the panoramic imaging system recognizes a collision risk in the driving vehicle, controlling the retractor to switch to an emergency rate to tighten the seat belt until the seat belt reaches the target restraint strength; Wherein, the emergency rate is greater than the basic rate.

[0014] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: By controlling the retractor to tighten the seat belt at a basic rate until the seat belt is in complete contact with the body surface of the occupant, this method can achieve a pre-tightening effect; At the same time, when the panoramic imaging system recognizes a collision risk, controlling the retractor to switch to an emergency rate to tighten the seat belt so that the seat belt reaches the target restraint strength can better restrain the occupant before a collision and ensure the safety of the occupant.

[0015] In an example of the present invention, a pressure detection device is built into the child safety seat; Before controlling the retractor to execute the first protection response strategy, the pre-tightening control method further includes: Detecting the weight parameter of the occupant through the pressure detection device, determining the restraint strength adjustment coefficient according to the weight parameter; Determining the target restraint strength according to the restraint strength adjustment coefficient and the preset restraint strength.

[0016] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: In the traditional method, the binding force of the seat belt cannot be reasonably set according to the weight of the occupant, resulting in poor protection effects for occupants of different weights; By detecting the weight parameter of the occupant through the pressure detection device, determining the restraint strength adjustment coefficient according to the weight parameter, and generating the target restraint strength according to the restraint strength adjustment coefficient and the preset restraint strength, this method can better meet the needs of occupants of different weights and improve the protection effects for occupants of different weights.

[0017] In an example of the present invention, after detecting the weight parameter of the occupant through the pressure detection device, the pre-tightening control method further includes: if it is detected that the weight parameter changes, and the change in the weight parameter exceeds a preset ratio and the duration exceeds a first preset time, then trigger the occupant posture calibration program; after the occupant posture calibration program ends, re-detect the calibrated weight parameter of the occupant, and re-determine the restraint strength adjustment coefficient according to the calibrated weight parameter.

[0018] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: The change in the posture of the occupant may cause inaccurate weight detection, which in turn affects the accuracy of determining the target restraint strength. When this method detects that the weight parameter changes, the change exceeds the preset ratio, and the duration exceeds the first preset time, it triggers the occupant posture calibration program, re-detects the calibrated weight parameter of the occupant after the occupant posture calibration program ends, and re-determines the restraint strength adjustment coefficient according to the calibrated weight parameter, ensuring the accuracy of the target restraint strength and being beneficial to ensuring the safety and comfort of the occupant.

[0019] In an example of the present invention, the child safety seat is internally provided with an environmental voiceprint acquisition module, and the pre-tightening control method further includes: collecting environmental sound signals through the environmental voiceprint acquisition module; if the current speed data is in a low-speed state, then increase the capture sensitivity of the environmental voiceprint acquisition module to high-frequency abnormal noises to focus on identifying high-frequency metal friction sounds; if the current speed data is in a high-speed state, then control the environmental voiceprint acquisition module to enable a wind noise suppression algorithm to focus on identifying the characteristic sound of glass breakage; identify the environmental sound signals, and if it is identified that the environmental sound signals include high-frequency metal friction sounds or the characteristic sound of glass breakage, then execute the first protection response strategy in advance.

[0020] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: In extreme cases such as the failure of the triaxial acceleration sensor, this method collects environmental sound signals through the environmental voiceprint acquisition module, and respectively focuses on identifying high-frequency metal friction sounds and the characteristic sound of glass breakage according to the state of the current speed data, improving the safety performance and early warning ability of the child safety seat.

[0021] In an example of the present invention, when it is detected that the driving tool is in an overspeed driving state or the current speed data is greater than the preset safety speed, trigger the deployment of the side wing protection device, including: if the current speed data is lower than the first preset speed value, then control the side wing protection device to deploy at the first rotation speed; if the current speed data is higher than the first preset speed value and lower than the second preset speed value, then adjust the deployment speed of the side wing protection device according to the magnitude of the current speed data; if the current speed data is higher than the second preset speed value, then control the side wing protection device to deploy at the second rotation speed; where the second preset speed value is greater than the first preset speed value.

[0022] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: By controlling the deployment speed of the side protection device according to the current speed data, it can better adapt to different collision situations, avoid the risk of occupant injury caused by unreasonable deployment speed of the side protection device, and improve the protection effect on the occupant.

[0023] On the other hand, the present invention also provides a child safety seat with an intelligent retractor, which can implement the pre-tensioning control method in any of the above examples. The child safety seat includes a seat body, a retractor, a tightening belt, a triaxial acceleration sensor, an inflatable buffer assembly, and a side protection device; the seat body has opposite front and back surfaces, the front surface is used to carry a child occupant, and a seat belt is provided on the front surface. The seat body is provided with a retraction hole communicating the front and back surfaces; the retractor is arranged on the back surface; one end of the tightening belt is connected to the seat belt, and the other end is connected to the retractor through the retraction hole; the triaxial acceleration sensor is arranged on the back surface and is communicatively connected to the retractor; the inflatable buffer assembly is arranged on the front surface; the side protection device is movably connected to both sides of the seat body.

[0024] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: It can achieve the technical effects corresponding to any of the above examples, which will not be elaborated here.

[0025] After adopting the technical solution of the present invention, the following technical effects can be achieved:

[0026] (1) By obtaining the composite motion data of the child safety seat and the current speed data of the driving vehicle, and dynamically calculating the composite collision risk index and comparing it with the preset safety boundary value, this method can more accurately determine whether there is a collision risk for the driving vehicle, reducing the possibility of misjudgment and missed judgment; at the same time, after determining that there is a collision risk, it controls the retractor to execute the first protection response strategy. When it is detected that the driving vehicle is in an overspeed state or the current speed data is greater than the preset safety speed, it triggers the deployment of the side protection device, which can better restrain the occupant before the collision occurs, thereby providing timely protection for the occupant and avoiding the violent forward impact of the occupant; after the first protection response strategy is executed, and dynamically adjusting the buffer protection strategy according to the current speed data and the composite motion data, it can better cope with different collision situations and effectively absorb and disperse the impact force generated by the collision;

[0027] (2) In the traditional method, due to the single data source, the calculation of the composite collision risk index is inaccurate. In the present invention, triaxial acceleration data is obtained through a triaxial acceleration sensor, yaw angular velocity data is obtained through a gyroscope sensor, and the current speed data is obtained through a CAN bus. Then, a synchronous compensation strategy is adopted for the triaxial acceleration data and the yaw angular velocity data by using a clock error model. Combining the current speed data to calculate the composite collision risk index, the problem of time-base drift existing between multi-sensor samplings is solved, the accuracy of data acquisition and processing is improved, the situations of misjudgment and missed judgment are reduced, and thus more reliable data support is provided for collision risk judgment;

[0028] (3) In the traditional method, the buffer protection strategy cannot be adjusted specifically according to the current speed data and triaxial acceleration data; in this method, the buffer protection strategy is dynamically adjusted according to the current speed data and the composite motion data, improving the pertinence and effectiveness of the buffer protection; in the case of high-speed collision, more effective buffer protection measures are required. In this method, when the current speed data reaches the high-speed interval threshold, the global inflation mode of the inflatable buffer component is activated, providing a stronger protection effect; in the case of low-speed collision, over-inflation of the buffer component may cause resource waste and unnecessary injuries. In this method, when it is detected that the current speed data drops to the safe speed threshold and the composite value of the triaxial acceleration data is less than the preset safe acceleration value, the inflatable buffer component is controlled to execute the air pressure gradient release strategy, realizing the reasonable control of the buffer component;

[0029] (4) In the traditional method, the restraint force of the seat belt cannot be reasonably set according to the weight of the occupant, resulting in poor protection effects for occupants with different weights; in this method, the weight parameter of the occupant is detected through a pressure detection device, the restraint strength adjustment coefficient is determined according to the weight parameter, and the target restraint strength is generated according to the restraint strength adjustment coefficient and the preset restraint strength, which can better meet the needs of occupants with different weights and improve the protection effects for occupants with different weights. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts;

[0031] Figure 1 It is a flowchart of a pre-tightening control method for a child safety seat with an intelligent retractor device provided by an embodiment of the present invention;

[0032] Figure 2 It is a structural schematic diagram of a child safety seat with an intelligent retractor device provided by an embodiment of the present invention;

[0033] Figure 3 is Figure 2 A schematic structural view of the child safety seat shown from another perspective;

[0034] Figure 4 is Figure 2 A schematic structural view of the child safety seat shown from another perspective;

[0035] Figure 5 is Figure 2 A schematic structural view of the child safety seat shown from another perspective.

[0036] Explanation of reference numerals:

[0037] 100, child safety seat; 10, seat body; 11, safety belt; 12, retraction hole; 20, retraction device; 30, tightening belt; 40, triaxial acceleration sensor; 50, inflatable buffer assembly; 60, side wing protection device. Detailed implementation manners

[0038] Hereinafter, embodiments of the present application will be described in detail. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0040] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is made with reference to the drawings.

[0041] Referring to Figure 1 , which is a flowchart of a pre-tightening control method for a child safety seat with an intelligent retraction device provided by an embodiment of the present invention. The child safety seat is installed in a driving tool. The child safety seat includes a retraction device and a side wing protection device. The pre-tightening control method includes:

[0042] S100: Obtain the composite motion data of the child safety seat and the current speed data of the driving vehicle, and dynamically calculate the composite collision risk index;

[0043] S200: When the composite collision risk index exceeds the preset safety boundary value, control the retractor to execute the first protection response strategy;

[0044] S300: Obtain the legal speed limit data of the section where the driving vehicle is located. When it is detected that the driving vehicle is in an overspeed state or the current speed data is greater than the preset safety speed, trigger the side wing protection device to deploy;

[0045] S400: After the first protection response strategy is executed, dynamically adjust the buffer protection strategy according to the current speed data and the composite motion data.

[0046] Specifically, by obtaining the composite motion data of the child safety seat and the current speed data of the driving vehicle, dynamically calculating the composite collision risk index, and comparing it with the preset safety boundary value, this method can more accurately determine whether there is a collision risk for the driving vehicle, reducing the possibility of misjudgment and missed judgment; at the same time, after determining that there is a collision risk, control the retractor to execute the first protection response strategy. When it is detected that the driving vehicle is in an overspeed state or the current speed data is greater than the preset safety speed, trigger the side wing protection device to deploy, which can better restrain the occupant before the collision occurs, thereby providing timely protection to the occupant and avoiding the violent forward impact of the occupant; after the first protection response strategy is executed, and dynamically adjust the buffer protection strategy according to the current speed data and the composite motion data, which can better handle different collision situations and effectively absorb and disperse the impact force generated by the collision.

[0047] Preferably, the driving vehicle is built - in with a CAN bus, and the child safety seat includes a three - axis acceleration sensor and a gyroscope sensor; obtaining the composite motion data of the child safety seat and the current speed data of the driving vehicle, and dynamically calculating the composite collision risk index, includes: obtaining the three - axis acceleration data of the child safety seat through the three - axis acceleration sensor, obtaining the yaw angular velocity data of the child safety seat through the gyroscope sensor, and obtaining the current speed data through the CAN bus; adopting a synchronous compensation strategy for the three - axis acceleration data and the yaw angular velocity data through a clock error model, and calculating the composite collision risk index in combination with the current speed data;

[0048] Calculating the composite collision risk index satisfies the following formula 1;

[0049] Wherein, formula 1 is:

[0050] P = k1*(a x 2 +a y 2 +a z2 ) 1 / 2 + k2 * V + k3 * Ω 2 ;

[0051] Among them, a x , a y and a z are respectively the three components after synchronous compensation of the three-axis acceleration data; V is the current speed data; Ω is the yaw angular velocity data after adopting the synchronous compensation strategy; P is the composite collision risk index, k1 = 0.2, k2 = 0.05, k3 = 0.1.

[0052] Furthermore, the preset safety boundary value is 2. When P is greater than 2, that is, the composite collision risk index exceeds the preset safety boundary value.

[0053] Furthermore, due to the time-base drift in multi-sensor sampling, such as the sampling frequencies of the three-axis acceleration sensor and the gyroscope sensor being different; the synchronous compensation strategy for the three-axis acceleration data and the yaw angular velocity data is adopted through the clock error model to satisfy the following formulas 2 and 3:

[0054] Among them, formula 2 is: Δt acc = t acc − t sync ;

[0055] Formula 3 is: Δt gyro = t gyro − t sync ;

[0056] Among them, Δt acc is the time deviation of the three-axis acceleration data, t acc is the sampling moment of the three-axis acceleration data, t sync is the system unified time reference, Δt gyro is the time deviation of the yaw angular velocity data, t gyro is the sampling moment of the yaw angular velocity data.

[0057] Furthermore, obtain the acceleration gradients of the three components of the three-axis acceleration data according to the three-axis acceleration data; obtain the yaw velocity gradient according to the yaw angular velocity data.

[0058] Furthermore, perform synchronous compensation calculations on the three components of a x0 , a y0 and a z0 of the three-axis acceleration data and the yaw angular velocity data respectively through the clock error model;

[0059] The synchronous compensation calculations satisfy the following formulas 4, 5, 6 and 7;

[0060] Among them, Equation 4 is: a x = a x0 + 0.2 * Δt acc * da x0 / dt;

[0061] Equation 5 is: a y = a y0 + 0.2 * Δt acc * da y0 / dt;

[0062] Equation 6 is: a z = a z0 + 0.2 * Δt acc * da z0 / dt;

[0063] Equation 7 is: Ω = Ω0 + 0.2 * Δt gyro * dΩ / dt;

[0064] Among them, a x0 , a y0 and a z0 are the three components of the triaxial acceleration, da x0 / dt, da y0 / dt and da z0 / dt are the acceleration gradients of the three components of the triaxial acceleration respectively, Ω0 is the yaw angular velocity data, and dΩ / dt is the yaw angular velocity data gradient.

[0065] Specifically, in the test scenario of emergency braking, according to the data, the negative acceleration in the X-axis direction is significant during emergency braking, while the yaw angular velocity shows that the child safety seat hardly rotates. After adopting the synchronous compensation strategy for the triaxial acceleration data and the yaw angular velocity data through the clock error model, the synchronous error reduction rate is 92%, and the multi-sensor data synchronization is significantly improved.

[0066] Table 1 Comparative experiment on the compensation effect after adopting the synchronous compensation strategy for the triaxial acceleration data and the yaw angular velocity data through the clock error model under different test scenarios

[0067]

[0068] Specifically, in the test scenario of emergency braking, according to the data, the negative acceleration in the X-axis direction is significant during emergency braking, while the yaw angular velocity shows that the child safety seat hardly rotates. After adopting the synchronous compensation strategy for the triaxial acceleration data and the yaw angular velocity data through the clock error model, the synchronous error reduction rate is 92%, and the multi-sensor data synchronization is significantly improved.

[0069] Specific calculation cases of the composite collision index for different driving events are shown in Table 2:

[0070] Table 2 Calculation cases of the composite collision index

[0071]

[0072] Specifically, in the event of a rear-end collision in the city, based on the current speed, the compensated three-axis acceleration, and the compensated angular velocity, the calculated P value is 2.01, and the first protection response strategy is executed.

[0073] Specifically, due to the single data source of the traditional method, the calculation of the composite collision risk index is inaccurate. In the present invention, the three-axis acceleration data is obtained through a three-axis acceleration sensor, the yaw angular velocity data is obtained through a gyroscope sensor, and the current speed data is obtained through the CAN bus. Then, a synchronous compensation strategy is adopted for the three-axis acceleration data and the yaw angular velocity data by using the clock error model, and the composite collision risk index is calculated in combination with the current speed data, solving the problem of time-base drift between multi-sensor samplings, improving the accuracy of data acquisition and processing, reducing the situations of misjudgment and missed judgment, and thus providing more reliable data support for collision risk judgment.

[0074] Preferably, the child safety seat is further provided with an inflatable buffer assembly; the buffer protection strategy is dynamically adjusted according to the current speed data and the composite motion data, including: if the current speed data reaches the high-speed interval threshold, the global inflation mode of the inflatable buffer assembly is activated; when it is detected that the current speed data drops to the safe speed threshold and the composite value of the three-axis acceleration data is less than the preset safe acceleration value, the inflatable buffer assembly is controlled to execute the air pressure gradient release strategy; when it is detected that the composite value of the three-axis acceleration data drops to zero and the current speed data drops to zero, the inflatable buffer assembly is controlled to execute the exhaust reset strategy.

[0075] Further, the high-speed interval threshold is that the current speed data is greater than 60 km / h; the safe speed threshold is that the current speed data is less than or equal to 60 km / h; the preset safe acceleration value is 2 m / s².

[0076] Further, the composite value of the three-axis acceleration data satisfies the following formula 8;

[0077] Wherein, formula 8 is:

[0078] X=(a x 2 +a y 2 +a z 2 ) 1 / 2 ;

[0079] Wherein, X is the composite value of the three-axis acceleration data.

[0080] Specifically, in the traditional method, the buffer protection strategy cannot be adjusted specifically according to the current speed data and triaxial acceleration data; this method dynamically adjusts the buffer protection strategy according to the current speed data and composite motion data, improving the pertinence and effectiveness of buffer protection; in the case of high-speed collisions, more effective buffer protection measures are required. When the current speed data reaches the high-speed interval threshold in this method, the global inflation mode of the inflatable buffer component is activated, providing a stronger protection effect; in the case of low-speed collisions, over-inflation of the buffer component may cause resource waste and unnecessary injuries. When it is detected that the current speed data drops to the safe speed threshold and the composite value of the triaxial acceleration data is less than the preset safe acceleration value in this method, the inflatable buffer component is controlled to execute the air pressure gradient release strategy, realizing reasonable control of the buffer component.

[0081] Preferably, before dynamically adjusting the buffer protection strategy according to the current speed data and composite motion data, the pre-tension control method further includes: obtaining the head image data of the occupant, generating the head orientation data of the occupant according to the head image data; determining the ejection position of the inflatable buffer component according to the head orientation data.

[0082] Specifically, in the existing method, the buffer protection strategy cannot be adjusted personalized according to the specific posture or position of the occupant, resulting in poor buffer effect; this method realizes personalized adjustment of the buffer protection strategy by obtaining the head image data of the occupant, generating the head orientation data, and determining the ejection position of the inflatable buffer component according to the head orientation data, ensuring that the buffer component can better protect the key parts of the occupant and improving the buffer effect.

[0083] Preferably, the retractor is connected to the seat belt in the child safety seat, and the driving tool includes a panoramic imaging system; controlling the retractor to execute the first protection response strategy includes: controlling the retractor to tighten the seat belt at the basic speed until the seat belt is in complete contact with the surface of the occupant; when the panoramic imaging system recognizes that there is a collision risk for the driving tool, controlling the retractor to switch to the emergency speed to tighten the seat belt until the seat belt reaches the target restraint strength; wherein, the emergency speed is greater than the basic speed.

[0084] Furthermore, the occupant posture calibration program includes controlling the retractor to tighten the seat belt.

[0085] Specifically, this method can achieve a pre-tightening effect by controlling the retractor to tighten the seat belt at the basic speed until the seat belt is in complete contact with the surface of the occupant; at the same time, when the panoramic imaging system recognizes the collision risk, controlling the retractor to switch to the emergency speed to tighten the seat belt so that the seat belt reaches the target restraint strength, which can better restrain the occupant before the collision and ensure the safety of the occupant.

[0086] Preferably, a pressure detection device is built into the child safety seat; before the retractor device executes the first protection response strategy, the pre-tightening control method further includes: detecting the weight parameter of the occupant through the pressure detection device, determining a restraint strength adjustment coefficient according to the weight parameter; and determining a target restraint strength according to the restraint strength adjustment coefficient and a preset restraint strength.

[0087] Further, when the weight parameter is less than or equal to 18 kg, the restraint strength adjustment coefficient K is 0.7; when the weight parameter is greater than 18 kg and less than or equal to 36 kg, the restraint strength adjustment coefficient K is 1; when the weight parameter is greater than 36 kg, the restraint strength adjustment coefficient K is 1.3; the target restraint strength = the restraint strength adjustment coefficient * the preset restraint strength, and the preset restraint strength is 200 N.

[0088] Specifically, in the traditional method, the binding force of the seat belt cannot be reasonably set according to the weight of the occupant, resulting in poor protection effects for occupants of different weights; this method detects the weight parameter of the occupant through the pressure detection device, determines the restraint strength adjustment coefficient according to the weight parameter, and generates the target restraint strength according to the restraint strength adjustment coefficient and the preset restraint strength, which can better meet the needs of occupants of different weights and improve the protection effects for occupants of different weights.

[0089] Preferably, after detecting the weight parameter of the occupant through the pressure detection device, the pre-tightening control method further includes: if it is detected that the weight parameter changes, and the change in the weight parameter exceeds a preset ratio and lasts for more than a first preset time, then trigger an occupant posture calibration program; after the occupant posture calibration program ends, re-detect the calibrated weight parameter of the occupant, and re-determine the restraint strength adjustment coefficient according to the calibrated weight parameter.

[0090] Further, the preset ratio is 15%.

[0091] Further, when the calibrated weight parameter is less than or equal to 18 kg, the restraint strength adjustment coefficient K is 0.7; when the calibrated weight parameter is greater than 18 kg and less than or equal to 36 kg, the restraint strength adjustment coefficient K is 1; when the calibrated weight parameter is greater than 36 kg, the restraint strength adjustment coefficient K is 1.3.

[0092] Specifically, the change in the posture of the occupant may cause inaccurate weight detection, which in turn affects the accuracy of determining the target restraint strength; this method triggers the occupant posture calibration program when it is detected that the weight parameter changes, and the change exceeds the preset ratio and lasts for more than the first preset time, and re-detects the calibrated weight parameter of the occupant after the occupant posture calibration program ends, and re-determines the restraint strength adjustment coefficient according to the calibrated weight parameter, ensuring the accuracy of the target restraint strength and being beneficial to ensuring the safety and comfort of the occupant.

[0093] Preferably, the child safety seat is internally provided with an environmental voiceprint acquisition module, and the pre-tightening control method further includes: collecting environmental sound signals through the environmental voiceprint acquisition module; if the current speed data is in a low-speed state, increasing the capture sensitivity of the environmental voiceprint acquisition module to high-frequency abnormal noises to focus on identifying high-frequency metal friction sounds; if the current speed data is in a high-speed state, controlling the environmental voiceprint acquisition module to enable a wind noise suppression algorithm to focus on identifying glass breakage characteristic sounds; identifying the environmental sound signals, and if it is identified that the environmental sound signals include high-frequency metal friction sounds or glass breakage characteristic sounds, executing a first protection response strategy in advance.

[0094] Further, the low-speed state is that the current speed data is less than or equal to 40 km / h; the high-speed state is that the current speed data is greater than 40 km / h.

[0095] Specifically, in extreme cases such as when the triaxial acceleration sensor fails, this method collects environmental sound signals through the environmental voiceprint acquisition module, and respectively focuses on identifying high-frequency metal friction sounds and glass breakage characteristic sounds according to the state of the current speed data, improving the safety performance and early warning ability of the child safety seat.

[0096] Preferably, when it is detected that the driving tool is in an overspeed driving state or the current speed data is greater than the preset safety speed, triggering the deployment of the side wing protection device, including: if the current speed data is lower than the first preset speed value, controlling the side wing protection device to deploy at the first rotation speed; if the current speed data is higher than the first preset speed value and lower than the second preset speed value, adjusting the deployment speed of the side wing protection device according to the size of the current speed data; if the current speed data is higher than the second preset speed value, controlling the side wing protection device to deploy at the second rotation speed; wherein, the second preset speed value is greater than the first preset speed value.

[0097] Further, when the current speed data V is lower than 40 km / h, the first rotation speed v1 of the side wing protection device is 20° / s; when the current speed data V is higher than 40 km / h and lower than 100 km / h, the deployment speed v2 of the side wing protection device = 20° + 0.5(V - 40)° / s; when the current speed data V is higher than 100 km / h, the second rotation speed v3 of the side wing protection device is 50° / s.

[0098] Specifically, controlling the deployment speed of the side wing protection device according to the current speed data can better adapt to different collision situations, avoid the risk of occupant injury caused by unreasonable deployment speed of the side wing protection device, and improve the protection effect on the occupant.

[0099] On the other hand, the embodiment of the present invention also provides a child safety seat with an intelligent retractor device, see Figures 2 - 5, Specifically, the child safety seat 100 includes a seat body 10, a retractor 20, a tightening belt 30, a triaxial acceleration sensor 40, an inflatable buffer assembly 50, and a side wing protection device 60; the seat body 10 has opposite front and back sides, the front side is for carrying an occupant, and a seat belt 11 is provided on the front side, and the seat body 10 is provided with a retraction hole 12 communicating the front and back sides; the retractor 20 is provided on the back side; one end of the tightening belt 30 is connected to the seat belt 11, and the other end is connected to the retractor 20 through the retraction hole 12; the triaxial acceleration sensor 40 is provided on the back side and is communicatively connected to the retractor 20; the inflatable buffer assembly 50 is provided on both sides of the seat body 10; the side wing protection device 60 is movably connected to both sides of the seat body 10.

[0100] Furthermore, the side wing protection device includes a left protection part and a right protection part; wherein, when the triaxial acceleration sensor 40 determines that the child safety seat is about to collide, the triaxial acceleration sensor 40 sends a pre-tightening trigger instruction to the retractor 20, the retractor 20 tightens the tightening belt 30, the inflatable buffer assembly 50 is activated, the left protection part and the right protection part rotate towards each other, and are combined and spliced to form a side wing protection structure, and the occupant is located in the protection area of the side wing protection structure.

[0101] Correspondingly, in this embodiment, the technical effects corresponding to any of the technical solutions in the above embodiments can be achieved, and details are not described herein again.

[0102] It should be noted that the child safety seat with an intelligent retractor and its pre-tightening control method in the specification content are exemplified by the environment installed in a vehicle, but the child safety seat with an intelligent retractor and its pre-tightening control method are not limited to the use environment in a vehicle, and are also applicable to other means of transportation with similar use environments, or to virtual scenarios or real scenarios for simulating similar environmental requirements.

[0103] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A method for controlling the preload of a child safety seat with an intelligent retracting device, characterized in that: The child safety seat is arranged in a driving tool, the child safety seat comprises a retracting device and a side wing protection device, the driving tool is equipped with a built-in CAN bus, the child safety seat comprises a three-axis acceleration sensor and a gyroscope sensor, the child safety seat is equipped with a built-in environmental sound pattern acquisition module, and the preload control method comprises: Acquiring composite motion data of the child safety seat and current speed data of the driving tool, and dynamically calculating a composite collision risk index; The acquiring of the composite motion data of the child safety seat and the current speed data of the driving tool, and dynamically calculating the composite collision risk index, includes: Acquire the three-axis acceleration data of the child safety seat through the three-axis acceleration sensor, acquire the yaw angular velocity data of the child safety seat through the gyroscope sensor, and acquire the current speed data through the CAN bus; A synchronous compensation strategy is adopted for the three-axis acceleration data and the yaw angular velocity data through a clock error model, and the composite collision risk index is calculated in combination with the current speed data; The composite collision risk index is calculated to satisfy the following formula 1: Wherein, the formula 1 is: P=k1*(a x 2 +a y 2 +a z 2 ) 1 / 2 +k2*V+k3*Ω 2 ; Among them, a x 、a y and a z are the three components of the three-axis acceleration data after the synchronous compensation strategy is adopted; V is the current speed data; Ω is the yaw angular velocity data after the synchronous compensation strategy is adopted; P is the composite collision risk index, k1=0.2, k2=0.05, k3=0.1; When the composite collision risk index exceeds a preset safety boundary value, controlling the retracting device to execute a first protection response strategy; Obtaining the legal speed limit data of the road section where the driving tool is located, and triggering the deployment of the side wing protection device when it is detected that the driving tool is in a speeding state or the current speed data is greater than a preset safety speed; After the first protection response strategy is executed, dynamically adjusting the buffer protection strategy according to the current speed data and the composite motion data; Collecting environmental sound signals through the environmental soundprint collection module; If the current speed data is in a low speed state, the capture sensitivity of the environmental soundprint collection module to high-frequency abnormal sounds is increased to focus on identifying high-frequency metal friction sounds; If the current rate data is in a high-speed state, the environmental soundprint collection module is controlled to enable a wind noise suppression algorithm to focus on identifying characteristic sounds of glass breakage; The environmental sound signal is identified, and if it is identified that the environmental sound signal includes the high-frequency metal friction sound or the glass breakage characteristic sound, the first protection response strategy is executed in advance.

2. The preload control method according to claim 1, characterized in that: The child safety seat is further provided with an inflatable cushioning component; the method of dynamically adjusting the cushioning protection strategy according to the current speed data and the composite motion data comprises: If the current speed data reaches the high-speed interval threshold, activating the global inflation mode of the inflatable cushioning component; When it is detected that the current speed data drops to a safety speed threshold, and the composite value of the three-axis acceleration data is less than a preset safety acceleration value, controlling the inflatable cushioning component to execute an air pressure gradient release strategy; When it is detected that the composite value of the three-axis acceleration data drops to zero and the current speed data drops to zero, the inflatable cushioning component is controlled to execute an exhaust reset strategy.

3. The preload control method according to claim 2, characterized in that: Before dynamically adjusting the buffer protection strategy according to the current speed data and the composite motion data, the preload control method further includes: Acquire head image data of an occupant, and generate head orientation data of the occupant according to the head image data; The pop-up position of the inflatable cushioning component is determined according to the head orientation data.

4. The preload control method according to claim 1, characterized in that: The retracting device is connected to the safety belt in the child safety seat, and the driving tool includes a surrounding imaging system; The controlling the retracting device to execute the first protection response strategy includes: Controlling the retracting device to tighten the seat belt at a basic rate until the seat belt is in close contact with the body surface of the occupant; When the surrounding imaging system identifies that the driving tool is at risk of collision, the retracting device is controlled to switch to an emergency speed to tighten the seat belt until the seat belt reaches a target restraint strength; The emergency rate is greater than the basic rate.

5. The preload control method according to claim 4, characterized in that: The child safety seat has a built-in pressure detection device; before controlling the retracting device to execute the first protection response strategy, the preload control method further includes: The weight parameter of the occupant is detected by the pressure detection device. determining a restraint strength adjustment coefficient according to the weight parameter; The target binding strength is determined according to the binding strength adjustment coefficient and a preset binding strength.

6. The preload control method according to claim 5, characterized in that: After detecting the weight parameter of the occupant by the pressure detection device, the preload control method further includes: If it is detected that the weight parameter changes, and the weight parameter changes by more than a preset ratio, and lasts for more than a first preset time, then triggering an occupant posture calibration procedure; After the occupant posture calibration procedure is completed, the occupant's calibration weight parameter is re-detected, and the restraint strength adjustment coefficient is re-determined based on the calibration weight parameter.

7. The preload control method according to claim 1, characterized in that: When it is detected that the driving tool is in an overspeeding state or the current speed data is greater than a preset safety speed, triggering the side wing protection device to deploy includes: If the current speed data is lower than a first preset speed value, controlling the side wing protection device to deploy at a first rotation speed; If the current speed data is higher than the first preset speed value and the current speed data is lower than the second preset speed value, adjusting the deployment speed of the side wing protection device according to the current speed data; If the current speed data is higher than the second preset speed value, controlling the side wing protection device to deploy at a second rotation speed; Wherein, the second preset rate value is greater than the first preset rate value.

8. A child safety seat with an intelligent retracting device, characterized in that: The preload control method according to any one of claims 1 to 7 can be implemented, wherein the child safety seat comprises: A seat body (10), the seat body (10) having a front side and a back side opposite to each other, the front side being used to carry an occupant, and the front side being provided with a safety belt (11), and the seat body (10) being provided with a retracting hole (12) communicating with the front side and the back side; A reeling device (20), the reeling device (20) being arranged on the back side; A tightening belt (30), one end of the tightening belt (30) being connected to the safety belt (11), and the other end of the tightening belt (30) being connected to the retracting device (20) via the retracting hole (12); a three-axis acceleration sensor (40), the three-axis acceleration sensor (40) being arranged on the back surface and being communicatively connected to the retracting device (20); An inflatable cushioning component (50), the inflatable cushioning component (50) being arranged on the front side; A wing protection device (60), wherein the wing protection device (60) is movably connected to two sides of the seat body (10).

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