Child safety seat with intelligent furling device and pre-tightening control method thereof

Abstract

The invention provides a child safety seat with an intelligent furling device and a pre-tightening control method thereof.The pre-tightening control method comprises the steps that composite motion data of the child safety seat and current rate data of a driving tool are obtained, and a composite collision risk index is dynamically calculated; when the composite collision risk index exceeds a preset safety boundary value, the furling device is controlled to execute a first protection response strategy; the regulation speed limit data of the road section where the driving tool is located is obtained, and when it is detected that the driving tool is in an overspeed driving state or the current speed data is larger than the preset safety speed, the side wing protection device is triggered to be unfolded; and after the first protection response strategy is executed, dynamically adjusting the buffer protection strategy according to the current rate data and the composite motion data. The child seat solves the technical problems that although an existing child seat can reduce most injuries, the child seat can not fix the body of a child passenger violently rushing forwards when encountering high-speed or offset collision, and protection on the passenger is insufficient.

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 retracting device and a pre-tensioning control method thereof. Background Art

[0002] In recent years, with the popularization of the transportation industry, the travel safety of children as special passengers has become an important research topic in the field of road traffic safety. Statistics show that the injury rate of minors aged 3-12 in traffic accidents is 47% higher than that of adults, and most of their casualties are caused by the lack of adaptability between the passenger restraint system and the physiological structure of children. Specifically, the traditional three-point seat belt is based on adult ergonomics design, and there is a significant adaptation contradiction with the immature musculoskeletal system of children; adult seat belts will get stuck in children's necks or strangle internal organs in collisions. Child safety seats in the prior art use five-point seat belts to secure children, thereby achieving protection for children.

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

[0005] To solve the above problems, the present invention provides a pre-tensioning control method for a child safety seat with an intelligent retracting device, wherein the child safety seat is arranged in a driving tool, and the child safety seat comprises a retracting device and a side wing protection device, and the pre-tensioning control method comprises: obtaining composite motion data of the child safety seat and current speed data of the driving tool, 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 regulatory 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.

[0006] Compared with the prior art, the technical effect achieved by adopting the technical solution is as follows: the method obtains the composite motion data of the child safety seat and the current speed data of the driving tool, and dynamically calculates the composite collision risk index, and compares it with the preset safety boundary value, so as to more accurately judge whether the driving tool has a collision risk, and reduce the possibility of misjudgment and missed judgment; at the same time, after judging that there is a collision risk, the retracting device is controlled to execute the first protection response strategy, and when it is detected that the driving tool is in an overspeeding 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 occupants before the collision occurs, thereby providing timely protection for the occupants and avoiding the occupants from violently rushing forward; 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, so as to better cope with different collision situations and effectively absorb and disperse the impact force generated by the collision.

[0007] In one embodiment of the present invention, a driving tool is built with a CAN bus, and a child safety seat includes a three-axis acceleration sensor and a gyroscope sensor; composite motion data of the child safety seat and current speed data of the driving tool are obtained, and a composite collision risk index is dynamically calculated, 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; calculating the composite collision risk index satisfies the following formula 1; wherein formula 1 is: P=k 1 *(a x 2 +a y 2 +a z 2 ) 1 / 2 +k 2 *V+k 3 *Ω 2 ; Among them, a x 、a y and a z They 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, k 1 = 0.2, k 2 = 0.05, k 3 =0.1.

[0008] Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the traditional method leads to inaccurate calculation of the composite collision risk index due to the single data source. The present invention obtains three-axis acceleration data through a three-axis acceleration sensor, obtains yaw angular velocity data through a gyroscope sensor, and obtains current rate data through a CAN bus, and then uses a clock error model to adopt a synchronous compensation strategy for the three-axis acceleration data and the yaw angular velocity data, and calculates the composite collision risk index in combination with the current rate data, which solves the problem of time base drift between multi-sensor sampling, improves the accuracy of data acquisition and processing, reduces misjudgment and missed judgment, and thus provides more reliable data support for collision risk judgment.

[0009] In one example of the present invention, the child safety seat is also provided with an inflatable cushioning component; the cushioning 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 cushioning component is activated; when it is detected that the current speed data drops to the safety speed threshold, and the composite value of the three-axis acceleration data is less than the preset safety acceleration value, the inflatable cushioning component 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 cushioning component is controlled to execute the 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 in a targeted manner according to the current rate data and the three-axis acceleration data; this method dynamically adjusts the buffer protection strategy according to the current rate data and the composite motion data, thereby improving the targetedness and effectiveness of the buffer protection; in the case of a high-speed collision, more effective buffer protection measures are required. When the current rate data reaches the high-speed interval threshold, this method activates the global inflation mode of the inflatable buffer component, thereby providing a stronger protection effect; in the case of a low-speed collision, over-inflation of the buffer component may lead to waste of resources and unnecessary injuries. When this method detects that the current rate data drops to the safety rate threshold and the composite value of the three-axis acceleration data is less than the preset safety acceleration value, it controls the inflatable buffer component to execute the air pressure gradient release strategy, thereby achieving reasonable control of the buffer component.

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

[0012] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the prior method cannot personalize the buffer protection strategy according to the specific posture or position of the occupant, resulting in poor buffering effect; this method obtains the head image data of the occupant, generates head orientation data according to the head image data, and determines the pop-up position of the inflatable buffer component according to the head orientation data, thereby realizing the personalization adjustment of the buffer protection strategy, ensuring that the buffer component can better protect the key parts of the occupant and improving the buffering effect.

[0013] In one example of the present invention, the reel is connected to the seat belt in the child safety seat, and the driving tool includes a peripheral imaging system; the reel is controlled to execute a first protection response strategy, including: controlling the reel to tighten the seat belt at a basic rate until the seat belt is in contact with the body surface of the occupant; when the peripheral imaging system recognizes that there is a risk of collision with the driving tool, controlling the reel to switch to an emergency rate to tighten the seat belt until the seat belt reaches a target restraint strength; wherein the emergency rate is greater than the basic rate.

[0014] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: this method can achieve a pre-tightening effect by 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; at the same time, when the surrounding imaging system identifies a collision risk, the retracting device is controlled to switch to an emergency rate to tighten the seat belt, so that the seat belt reaches the target restraint strength, which can better restrain the occupant before a collision occurs, thereby ensuring the safety of the occupant.

[0015] In one example of the present invention, the child safety seat is equipped with a built-in pressure detection device; before controlling the retracting device to execute the first protection response strategy, the pre-tensioning control method further includes: detecting the weight parameter of the occupant through the pressure detection device, and 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 effect achieved by adopting this technical solution is as follows: in the traditional method, the restraining force of the seat belt cannot be reasonably set according to the weight of the occupant, resulting in poor protection effect for occupants of different weights; this method detects the weight parameter of the occupant through a 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 adapt to the needs of occupants of different weights and improve the protection effect for occupants of different weights.

[0017] In one example of the present invention, after detecting the weight parameter of the occupant by a pressure detection device, the pretensioning control method further includes: if a change in the weight parameter is detected, and the change in the weight parameter exceeds a preset ratio, and the duration exceeds a first preset time, triggering an occupant posture calibration program; after the occupant posture calibration program is completed, re-detecting the occupant's calibrated weight parameter, and re-determining the restraint strength adjustment coefficient based on the calibrated weight parameter.

[0018] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: changes in the occupant's posture may lead to inaccurate weight detection, thereby affecting the accuracy of determining the target restraint strength; when the method detects that the weight parameter has changed, and the change exceeds a preset ratio, and the duration exceeds a first preset time, the occupant's posture calibration program is triggered, and the occupant's calibrated weight parameter is re-detected after the occupant's posture calibration program is completed, and the restraint strength adjustment coefficient is re-determined based on the calibrated weight parameter, thereby ensuring the accuracy of the target restraint strength and facilitating the safety and comfort of the occupant.

[0019] In one example of the present invention, the child safety seat is equipped with an environmental soundprint collection module, and the pretensioning control method further includes: collecting environmental sound signals through the environmental soundprint collection module; if the current speed data is in a low-speed state, improving the capture sensitivity of the environmental soundprint collection module to high-frequency abnormal noises, so as to focus on identifying high-frequency metal friction sounds; if the current speed data is in a high-speed state, controlling the environmental soundprint collection module to enable a wind noise suppression algorithm, so as to focus on identifying characteristic sounds of glass breakage; identifying environmental sound signals, and if it is identified that the environmental sound signals include high-frequency metal friction sounds or characteristic sounds of glass breakage, executing the first protection response strategy in advance.

[0020] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: in extreme cases, such as when the three-axis acceleration sensor fails, this method collects environmental sound signals through the environmental soundprint collection module, and according to the state of the current rate data, focuses on identifying high-frequency metal friction sounds and glass breakage characteristic sounds, thereby improving the safety performance and early warning capability of child safety seats.

[0021] In one example of the present invention, 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, the side wing protection device is triggered to deploy, including: if the current speed data is lower than a first preset speed value, the side wing protection device is controlled to deploy at a first rotation rate; if the current speed data is higher than the first preset speed value and the current speed data is lower than a second preset speed value, the deployment rate of the side wing protection device is adjusted according to the current speed data; if the current speed data is higher than the second preset speed value, the side wing protection device is controlled to deploy at a second rotation rate; wherein the second preset speed value is greater than the first preset speed value.

[0022] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: the deployment rate of the side wing protection device is controlled according to the current rate data, which can better adapt to different collision situations, avoid the risk of occupant injury caused by unreasonable deployment rate of the side wing protection device, and improve the protection effect on the occupants.

[0023] On the other hand, the present invention also provides a child safety seat with an intelligent winding device, which can implement the pre-tensioning control method as in any of the above examples, wherein the child safety seat comprises a seat body, a winding device, a tightening belt, a three-axis acceleration sensor, an inflatable cushioning assembly and a side wing protection device; the seat body has a relative front and back side, the front side is used to carry a child passenger, and a safety belt is provided on the front side, and the seat body is provided with a winding hole connecting the front and back sides; the winding device is provided on the back side; one end of the tightening belt is connected to the safety belt, and the other end is connected to the winding device through the winding hole; the three-axis acceleration sensor is provided on the back side, and is communicatively connected to the winding device; the inflatable cushioning assembly is provided on the front side; and the side wing protection devices are movably connected to both sides of the seat body.

[0024] Compared with the prior art, the technical effect achieved by adopting this technical solution is: it can achieve the technical effect corresponding to any of the above examples, which will not be repeated here.

[0025] After adopting the technical solution of the present invention, the following technical effects can be achieved: (1) This method obtains the composite motion data of the child safety seat and the current speed data of the driving tool, and dynamically calculates the composite collision risk index, and compares it with the preset safety boundary value, so as to more accurately judge whether the driving tool has a collision risk, thereby reducing the possibility of misjudgment and missed judgment; at the same time, after judging that there is a collision risk, the retracting device is controlled to execute the first protection response strategy. When it is detected that the driving tool is in a speeding 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 the collision occurs, thereby providing timely protection for the occupant and avoiding the occupant from violently rushing forward; 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, so as to better cope with different collision situations and effectively absorb and disperse the impact force generated by the collision; (2) The traditional method has a single data source, which leads to inaccurate calculation of the composite collision risk index. The present invention obtains three-axis acceleration data through a three-axis acceleration sensor, obtains yaw angular velocity data through a gyroscope sensor, and obtains current rate data through a CAN bus. Then, a clock error model is used to adopt a synchronous compensation strategy for the three-axis acceleration data and the yaw angular velocity data, and the composite collision risk index is calculated in combination with the current rate data. This solves the problem of time base drift between multi-sensor sampling, improves the accuracy of data acquisition and processing, and reduces the cases of misjudgment and missed judgment, thereby providing more reliable data support for collision risk judgment. (3) In the traditional method, the buffer protection strategy cannot be adjusted in a targeted manner according to the current speed data and the three-axis acceleration data; this method dynamically adjusts the buffer protection strategy according to the current speed data and the composite motion data, thereby improving the targetedness and effectiveness of the buffer protection; in the case of a high-speed collision, more effective buffer protection measures are required. When the current speed data reaches the high-speed interval threshold, this method activates the global inflation mode of the inflatable buffer component, thereby providing a stronger protection effect; in the case of a low-speed collision, over-inflation of the buffer component may lead to waste of resources and unnecessary injuries. When this method detects that the current speed data drops to the safety speed threshold and the composite value of the three-axis acceleration data is less than the preset safety acceleration value, it controls the inflatable buffer component to execute the air pressure gradient release strategy, thereby achieving reasonable control of the buffer component; (4) In the traditional method, the restraining force of the seat belt cannot be reasonably set according to the weight of the occupant, resulting in poor protection for occupants of different weights. The present method detects the weight parameters of the occupant through a pressure detection device, determines the restraint strength adjustment coefficient according to the weight parameters, and generates a 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 effect for occupants of different weights. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings to be used in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 A flow chart of a pre-tensioning control method of a child safety seat with an intelligent retracting device provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a child safety seat with an intelligent retracting device provided by an embodiment of the present invention; Figure 3 for Figure 2 A schematic diagram of the structure of the child safety seat shown in another perspective; Figure 4 for Figure 2 A schematic diagram of the structure of the child safety seat shown in another perspective; Figure 5 for Figure 2 A schematic structural diagram of a child safety seat from another perspective is shown.

[0027] Description of reference numerals: 100. Child safety seat; 10. Seat body; 11. Safety belt; 12. Retracting hole; 20. Retracting device; 30. Retraction belt; 40. Three-axis acceleration sensor; 50. Inflatable cushioning component; 60. Side wing protection device. DETAILED DESCRIPTION

[0028] The embodiments of the present application will be described in detail below. 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 only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0029] In the description of this 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 can be a fixed connection, or it can be connected, or it can be connected in one piece; it can be a mechanical connection or an electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] See also Figure 1 , which is a flow chart of a pre-tensioning control method of a child safety seat with an intelligent retracting device provided by an embodiment of the present invention, wherein the child safety seat is arranged in a driving tool, the child safety seat comprises a retracting device and a side wing protection device, and the pre-tensioning control method comprises: S100: Acquire composite motion data of the child safety seat and current speed data of the driving tool, and dynamically calculate a composite collision risk index; S200: When the composite collision risk index exceeds a preset safety boundary value, controlling the retracting device to execute a first protection response strategy; S300: 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; 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.

[0032] Specifically, the method obtains the composite motion data of the child safety seat and the current speed data of the driving tool, and dynamically calculates the composite collision risk index, and compares it with the preset safety boundary value, so as to more accurately judge whether the driving tool has a collision risk, and reduce the possibility of misjudgment and missed judgment; at the same time, after determining that there is a collision risk, the retracting device is controlled to execute the first protection response strategy, and when it is detected that the driving tool is in a speeding 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 the collision occurs, thereby providing timely protection for the occupant and avoiding the occupant's violent forward rush; 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, so as to better cope with different collision situations and effectively absorb and disperse the impact force generated by the collision.

[0033] Preferably, the driving tool has a built-in CAN bus, and the child safety seat includes a three-axis acceleration sensor and a gyroscope sensor; the composite motion data of the child safety seat and the current speed data of the driving tool are obtained, and a composite collision risk index is dynamically calculated, 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; Wherein, formula 1 is: P=k 1 *(a x 2 +a y 2 +a z 2 ) 1 / 2 +k 2 *V+k 3 *Ω 2 ; Among them, a x 、a y and a zThey are the three components of the three-axis acceleration data after synchronous compensation; 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, k 1 = 0.2, k 2 = 0.05, k 3 =0.1.

[0034] Furthermore, the preset safety boundary value is 2. When P is greater than 2, the composite collision risk index exceeds the preset safety boundary value.

[0035] Furthermore, due to the time base drift of multi-sensor sampling, such as the sampling frequency of the three-axis acceleration sensor and the sampling frequency of the gyroscope sensor are different; a synchronous compensation strategy is adopted for the three-axis acceleration data and the yaw angular velocity data through the clock error model to satisfy the following formulas 2 and 3: Wherein, formula 2 is: Δt acc =t acc −t sync ; Formula 3 is: Δt gyro =t gyro −t sync ; Among them, Δt acc is the time deviation of the three-axis acceleration data, t acc is the sampling time of the three-axis acceleration data, t sync is the unified time base of the system, Δt gyro is the time deviation of the yaw rate data, t gyro is the sampling time of the yaw rate data.

[0036] Further, the acceleration gradients of the three components of the three-axis acceleration data are obtained according to the three-axis acceleration data; and the yaw velocity gradient is obtained according to the yaw angular velocity data.

[0037] Furthermore, the clock error model is used to calculate the a of the three-axis acceleration data. x0 、a y0 and a z0 The three components and yaw rate data are synchronously compensated and calculated respectively; The synchronous compensation calculation satisfies the following formulas 4, 5, 6 and 7; Wherein, formula 4 is: x =a x0 + 0.2*Δt acc *da x0 / dt; Formula 5 is: y =a y0 + 0.2*Δt acc *day0 / dt; Formula 6 is: z =a z0 + 0.2*Δt acc *da z0 / dt; Formula 7 is: Ω=Ω 0 + 0.2*Δt gyro *dΩ / dt; Among them, a x0 、a y0 and a z0 are the three components of triaxial acceleration, da x0 / dt、da y0 / dt and da z0 / dt are the acceleration gradients of the three components of the three-axis acceleration, Ω 0 is the yaw rate data, and dΩ / dt is the yaw rate data gradient.

[0038] The comparison experiment of compensation effect after adopting synchronous compensation strategy for triaxial acceleration data and yaw angular velocity data through clock error model in different test scenarios is shown in Table 1: Table 1 Comparison of compensation effects of the clock error model in different test scenarios after adopting a synchronous compensation strategy for the three-axis acceleration data and yaw angular velocity data Specifically, in the emergency braking test scenario, according to the data, the negative acceleration of the X-axis is significant during emergency braking, while the yaw angular velocity shows that the child safety seat has almost no rotation. After adopting a synchronous compensation strategy for the three-axis acceleration data and yaw angular velocity data through the clock error model, the synchronization error reduction rate was 92%, and the synchronization of multi-sensor data was significantly improved.

[0039] Specific examples of calculation of composite collision indicators for different driving events are shown in Table 2: Table 2 Calculation examples of composite collision index Specifically, in an urban rear-end driving incident, 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.

[0040] Specifically, the traditional method has inaccurate calculation of the composite collision risk index due to the single data source. The present invention obtains three-axis acceleration data through a three-axis acceleration sensor, obtains yaw angular velocity data through a gyroscope sensor, and obtains current rate data through a CAN bus, and then uses a clock error model to adopt a synchronous compensation strategy for the three-axis acceleration data and the yaw angular velocity data, and calculates the composite collision risk index in combination with the current rate data, which solves the problem of time base drift between multi-sensor sampling, improves the accuracy of data acquisition and processing, and reduces misjudgment and missed judgment, thereby providing more reliable data support for collision risk judgment.

[0041] Preferably, the child safety seat is also provided with an inflatable cushioning component; the cushioning 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 cushioning component is activated; when it is detected that the current speed data drops to the safety speed threshold, and the composite value of the three-axis acceleration data is less than the preset safety acceleration value, the inflatable cushioning component 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 cushioning component is controlled to execute the exhaust reset strategy.

[0042] Furthermore, the high-speed section threshold is that the current speed data is greater than 60km / h; the safety speed threshold is that the current speed data is less than or equal to 60km / h; and the preset safety acceleration value is 2m / s².

[0043] Furthermore, the composite value of the three-axis acceleration data satisfies the following formula 8: Wherein, formula 8 is: X=(a x 2 +a y 2 +a z 2 ) 1 / 2 ; Wherein, X is the composite value of the three-axis acceleration data.

[0044] Specifically, in traditional methods, the buffer protection strategy cannot be adjusted in a targeted manner according to the current rate data and the three-axis acceleration data; the present method dynamically adjusts the buffer protection strategy according to the current rate data and the composite motion data, thereby improving the targetedness and effectiveness of the buffer protection; in high-speed collision situations, more effective buffer protection measures are required, and the present method activates the global inflation mode of the inflatable buffer component when the current rate data reaches the high-speed interval threshold, thereby providing a stronger protection effect; in low-speed collision situations, over-inflation of the buffer component may lead to waste of resources and unnecessary injuries, and when the present method detects that the current rate data drops to the safety rate threshold and the composite value of the three-axis acceleration data is less than the preset safety acceleration value, the inflatable buffer component is controlled to execute the air pressure gradient release strategy, thereby achieving reasonable control of the buffer component.

[0045] Preferably, before dynamically adjusting the buffer protection strategy according to the current rate data and the composite motion data, the preload control method also includes: acquiring head image data of the occupant, generating head orientation data of the occupant according to the head image data; and determining the pop-up position of the inflatable buffer assembly according to the head orientation data.

[0046] Specifically, the existing methods are unable to perform personalized adjustment of the buffer protection strategy according to the specific posture or position of the occupant, resulting in poor buffering effect; the present method obtains the occupant's head image data, generates head orientation data, and determines the pop-up position of the inflatable buffer component according to the head orientation data, thereby achieving personalized adjustment of the buffer protection strategy, ensuring that the buffer component can better protect the occupant's key parts and improving the buffering effect.

[0047] Preferably, the reeling device is connected to the seat belt in the child safety seat, and the driving tool includes a surrounding imaging system; the reeling device is controlled to execute a first protection response strategy, including: controlling the reeling device to tighten the seat belt at a basic rate until the seat belt is in contact with the body surface of the occupant; when the surrounding imaging system recognizes that there is a risk of collision in the driving tool, controlling the reeling device to switch to an emergency rate to tighten the seat belt until the seat belt reaches a target restraint strength; wherein the emergency rate is greater than the basic rate.

[0048] Further, the occupant posture calibration procedure includes controlling the retractor to tighten the seat belt.

[0049] Specifically, the method controls the retracting device to tighten the seat belt at a basic rate until the seat belt is in close contact with the occupant's body surface, thereby achieving a pre-tightening effect; at the same time, when the surrounding imaging system identifies a collision risk, the retracting device is controlled to switch to an emergency rate to tighten the seat belt, so that the seat belt reaches the target restraint strength, which can better restrain the occupant before a collision occurs, thereby ensuring the occupant's safety.

[0050] Preferably, the child safety seat is equipped with a built-in pressure detection device; before controlling the retracting device to execute the first protection response strategy, the pre-tensioning control method also includes: detecting the weight parameter of the occupant by the pressure detection device, and 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.

[0051] Furthermore, when the body weight parameter is less than or equal to 18 kg, the restraint strength adjustment coefficient K is 0.7; when the body 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 body weight parameter is greater than 36 kg, the restraint strength adjustment coefficient K is 1.3; the target restraint strength = restraint strength adjustment coefficient * preset restraint strength, the preset restraint strength is 200N.

[0052] Specifically, in the traditional method, the restraining force of the seat belt cannot be reasonably set according to the weight of the occupant, resulting in poor protection for occupants of different weights; the present method detects the weight parameter of the occupant through a pressure detection device, determines the restraint strength adjustment coefficient according to the weight parameter, and generates a target restraint strength according to the restraint strength adjustment coefficient and the preset restraint strength, which can better adapt to the needs of occupants of different weights and improve the protection effect for occupants of different weights.

[0053] Preferably, after detecting the weight parameter of the occupant by the pressure detection device, the pretensioning control method also includes: if a change in the weight parameter is detected, and the change in the weight parameter exceeds a preset ratio, and the duration exceeds a first preset time, then triggering an occupant posture calibration program; after the occupant posture calibration program is completed, re-detecting the occupant's calibrated weight parameter, and re-determining the restraint strength adjustment coefficient based on the calibrated weight parameter.

[0054] Furthermore, the preset ratio is 15%.

[0055] Furthermore, 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.

[0056] Specifically, changes in the occupant's posture may lead to inaccurate weight detection, thereby affecting the accuracy of determining the target restraint strength. When the method detects that the weight parameter has changed, and the change exceeds a preset ratio and lasts for more than a first preset time, the occupant's posture calibration program is triggered, and the occupant's calibrated weight parameter is re-detected after the occupant posture calibration program is completed, and the restraint strength adjustment coefficient is re-determined based on the calibrated weight parameter, thereby ensuring the accuracy of the target restraint strength and facilitating the safety and comfort of the occupant.

[0057] Preferably, the child safety seat is equipped with an environmental soundprint collection module, and the pre-tensioning control method further includes: collecting environmental sound signals through the environmental soundprint collection module; if the current speed data is in a low-speed state, improving the capture sensitivity of the environmental soundprint collection module to high-frequency abnormal noises, so as to focus on identifying high-frequency metal friction sounds; if the current speed data is in a high-speed state, controlling the environmental soundprint collection module to enable a wind noise suppression algorithm, so as to focus on identifying characteristic sounds of glass breakage; identifying environmental sound signals, and if it is identified that the environmental sound signals include high-frequency metal friction sounds or characteristic sounds of glass breakage, executing the first protection response strategy in advance.

[0058] Furthermore, the low-speed state means that the current speed data is less than or equal to 40 km / h; the high-speed state means that the current speed data is greater than 40 km / h.

[0059] Specifically, in extreme cases, such as when the three-axis acceleration sensor fails, the method collects ambient sound signals through the ambient soundprint collection module, and focuses on identifying high-frequency metal friction sounds and glass breakage characteristic sounds according to the state of the current rate data, thereby improving the safety performance and early warning capability of the child safety seat.

[0060] Preferably, 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, the side wing protection device is triggered to deploy, including: if the current speed data is lower than a first preset speed value, the side wing protection device is controlled to deploy at a first rotation rate; if the current speed data is higher than the first preset speed value and the current speed data is lower than a second preset speed value, the deployment rate of the side wing protection device is adjusted according to the current speed data; if the current speed data is higher than the second preset speed value, the side wing protection device is controlled to deploy at a second rotation rate; wherein the second preset speed value is greater than the first preset speed value.

[0061] Furthermore, when the current speed data V is lower than 40 km / h, the first rotation speed v of the wing protection device is 1 is 20° / s; when the current speed data V is higher than 40km / h and lower than 100km / h, the deployment speed v of the side protection device is 2 =20°+0.5(V-40)° / s; when the current speed data V is higher than 100km / h, the second rotation speed v of the wing protection device 3 =50° / s.

[0062] Specifically, controlling the deployment rate of the side wing protection device according to the current rate data can better adapt to different collision situations, avoid the risk of occupant injury caused by unreasonable deployment rate of the side wing protection device, and improve the protection effect on the occupants.

[0063] On the other hand, an embodiment of the present invention further provides a child safety seat with an intelligent retracting device, see Figure 2-Figure 5 Specifically, the child safety seat 100 includes a seat body 10, a retracting device 20, a tightening belt 30, a three-axis acceleration sensor 40, an inflatable cushioning assembly 50 and a wing protection device 60; the seat body 10 has a relative front and back, the front side is used to carry an occupant, and a safety belt 11 is provided on the front side, and the seat body 10 is provided with a retracting hole 12 connecting the front and back sides; the retracting device 20 is provided on the back side; one end of the tightening belt 30 is connected to the safety belt 11, and the other end is connected to the retracting device 20 through the retracting hole 12; the three-axis acceleration sensor 40 is provided on the back side and is communicatively connected to the retracting device 20; the inflatable cushioning assembly 50 is provided on both sides of the seat body 10; the wing protection device 60 is movably connected to both sides of the seat body 10.

[0064] Furthermore, the side wing protection device includes a left protection part and a right protection part; wherein, when the three-axis acceleration sensor 40 determines that the child safety seat is about to collide, the three-axis acceleration sensor 40 sends a pre-tightening trigger instruction to the retracting device 20, the retracting device 20 tightens the tightening belt 30, the inflatable buffer assembly 50 is started, the left protection part and the right protection part rotate towards each other, merge and splice to form a side wing protection structure, and the occupant is located in the protection area of ​​the side wing protection structure.

[0065] Correspondingly, in this embodiment, the technical effect corresponding to any technical solution in the above embodiments can be achieved, which will not be repeated here.

[0066] It should be noted that the child safety seat with an intelligent retracting device and the pre-tensioning control method thereof in the specification are exemplified by an environment in which they are installed in a vehicle, but the child safety seat with an intelligent retracting device and the pre-tensioning control method thereof are not limited to the use environment in a vehicle, but are also applicable to other means of transportation with similar use environments, or to virtual scenes or real scenes for simulating similar environmental requirements.

[0067] 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 shall 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, 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; 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, the buffer protection strategy is dynamically adjusted according to the current speed data and the composite motion data.

2. The preload control method according to claim 1, characterized in that: The driving tool has a built-in CAN bus, and the child safety seat includes a three-axis acceleration sensor and a gyroscope sensor; the obtaining of composite motion data of the child safety seat and current speed data of the driving tool, and the dynamic calculation of a 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 They 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.

3. The preload control method according to claim 2, 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.

4. The preload control method according to claim 3, 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.

5. 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.

6. The preload control method according to claim 5, 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.

7. The preload control method according to claim 6, 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.

8. The preload control method according to claim 1, characterized in that: The child safety seat is equipped with an environmental sound pattern collection module, and the preload control method further includes: 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.

9. 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 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.

10. A child safety seat with an intelligent retracting device, characterized in that: The preload control method according to any one of claims 1 to 9 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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