CN117284174B

CN117284174B - Seating sensing method and system for child safety seat

Info

Publication number: CN117284174B
Application number: CN202311325382.0A
Authority: CN
Inventors: 方岩; 沈牧晨
Original assignee: Ousong Technology Hainan Co ltd
Current assignee: Ousong Technology Hainan Co ltd
Priority date: 2023-10-12
Filing date: 2023-10-12
Publication date: 2024-06-04
Anticipated expiration: 2043-10-12
Also published as: CN117284174A

Abstract

The invention relates to the technical field of safety seats, solves the problem that the child seat induction cannot be accurately realized on a child safety seat due to the interference of pets or other articles in the prior art, and provides a seat induction method and a seat induction system on the child safety seat. The method comprises the following steps: the method comprises the steps of obtaining pressure sensing triggering information of a preset area on the child safety seat, wherein the preset area at least comprises: a headrest area, a backrest area, and a seating surface area; according to the pressure sensing triggering information, if the seating surface area is detected to be triggered, determining that a target to be identified is seated; when the target to be identified is determined to be seated, if the backrest area is triggered and/or the headrest area is triggered, determining that the target to be identified is a child; and when the child is determined to be sitting, controlling the safety seat to work. The invention avoids the interference of pets or other articles and improves the accuracy of the child seat sensing on the child safety seat.

Description

Seating sensing method and system for child safety seat

Technical Field

The invention relates to the technical field of safety seats, in particular to a seating induction method and a seating induction system for a child safety seat.

Background

Child safety seats are important equipment for protecting children from riding in vehicles, accurate seating senses can ensure that the child sits correctly in the seat to minimize the risk of injury in traffic accidents, conversely, inaccurate seating senses can lead to unsafe sitting postures or positions for the child, thereby increasing the likelihood of injury, and in many countries, use of child safety seats is legally required, violating these regulations can lead to fines or other legal consequences, and accurate seating senses are an important ring of ensuring compliance with regulations.

The prior art chinese patent CN113386634a discloses a car seat with an intelligent control system, comprising: and when the sum of the pressure values detected by the two edge pressure sensors is smaller than the sum of the pressure values detected by the two center pressure sensors, calculating the difference value of the sum of the pressure values detected by the edge pressure sensors and the sum of the pressure values detected by the center pressure sensors, if the difference value is larger than a threshold value, sending a slim signal to an intelligent control processor, judging that passengers on the seat are slim, and if the difference value is smaller than the threshold value, sending a plump signal to the intelligent control processor, and judging that passengers on the seat are plump. The automobile seat of the intelligent control system can judge the body state of a passenger according to the pressure values of the central pressure sensor and the edge pressure sensor, but the four pressure sensors in the scheme are only arranged on the seat cushion, if the judgment of seating induction is carried out by only using the pressure of the seat cushion area, false alarm can be caused, a pet or other objects are mistakenly identified as children, unnecessary interference and trouble can be caused, and the reliability and usability of the system are reduced.

Therefore, how to accurately realize the child sitting sensing on the child safety seat and avoid the interference of pets or other articles is a problem to be solved.

Disclosure of Invention

In view of the above, the present invention provides a seating sensing method and system for a child safety seat, which are used for solving the problem that the seating sensing of a child cannot be accurately realized on the child safety seat due to the interference of pets or other objects in the prior art.

The technical scheme adopted by the invention is as follows:

In a first aspect, the present invention provides a method of seating sensing on a child safety seat, the method comprising:

S1: the method comprises the steps of obtaining pressure sensing triggering information of a preset area on the child safety seat, wherein the preset area at least comprises: a headrest area, a backrest area, and a seating surface area;

S2: according to the pressure sensing triggering information, if the seating surface area is detected to be triggered, determining that a target to be identified is seated;

S3: when the target to be identified is determined to be seated, if the backrest area is triggered and/or the headrest area is triggered, determining that the target to be identified is a child;

s4: and when the child is determined to be sitting, controlling the safety seat to work.

Preferably, the S1 includes:

S11: acquiring initial densities of supporting materials in each preset area of the child safety seat, wherein the headrest area corresponds to a first initial density of the supporting materials, the backrest area corresponds to a second initial density of the supporting materials, the seat surface area corresponds to a third initial density of the supporting materials, the first initial density is smaller than the second initial density, and the second initial density is smaller than the third initial density;

S12: respectively adjusting the first initial density, the second initial density and the third initial density according to the preset child age and child weight until the supporting material can bear trigger pressures corresponding to the preset child age and child weight, wherein the trigger pressures comprise a first trigger pressure, a second trigger pressure and a third trigger pressure;

S13: if the actual pressure born by the supporting material corresponding to the headrest area after the first initial density adjustment is greater than the first trigger pressure, detecting that the head area is triggered;

S14: if the actual pressure born by the supporting material corresponding to the backrest region after the second initial density adjustment is greater than the second trigger pressure, detecting that the backrest region is triggered;

s15: and if the actual pressure born by the supporting material corresponding to the seat surface area after the third initial density adjustment is greater than the third trigger pressure, detecting that the seat surface area is triggered.

Preferably, the S11 includes:

s111: dividing the seating surface area into a plurality of target areas, wherein the target areas at least comprise: a seat surface front region, a seat surface both side region, and a seat surface rear region;

S112: and adjusting the density of the supporting material in each target area to obtain a target density, wherein the target density at least comprises: a first target density corresponding to the front region of the seat surface, a second target density corresponding to the two side regions of the seat surface and a third target density corresponding to the rear region of the seat surface, wherein the second target density is smaller than the first target density, and the first target density is smaller than the third target density;

S113: and carrying out average processing on the first target density, the second target density and the third target density to obtain the third initial density.

Preferably, the S3 includes:

S31: when the target to be identified is determined to be seated, if the backrest region is detected to be triggered and/or the headrest region is detected to be triggered, acquiring the real-time thermal infrared radiation intensity of each preset region;

s32: calculating a real-time temperature value of each preset area according to the real-time thermal infrared radiation intensity;

S33: and judging whether the real-time temperature value is matched with a preset target temperature, and determining that the target to be identified is a child when the real-time temperature value is matched with the preset target temperature.

Preferably, the S33 includes:

S331: acquiring a first temperature interval corresponding to the seat surface area, a second temperature interval corresponding to the backrest area and a third temperature interval corresponding to the headrest area;

S332: acquiring a first real-time temperature average value corresponding to a seat surface area, a second real-time temperature average value corresponding to a backrest area and a third real-time temperature average value corresponding to a headrest area;

S333: and if the first temperature average value is in the first temperature interval, and/or the second temperature average value is in the second temperature interval, and/or the third temperature average value is in the third temperature interval, determining that the target to be identified is a child.

Preferably, the S332 includes:

S3321: acquiring a preset first time interval;

s3322: acquiring a real-time temperature value set corresponding to each preset area in the first time interval according to the first time interval;

S3323: and carrying out averaging treatment on the real-time temperature value set, and outputting the real-time temperature average value.

Preferably, the S333 includes:

S3331: if the first temperature average value is in the first temperature interval, and/or the second temperature average value is in the second temperature interval, and/or the third temperature average value is in the third temperature interval, acquiring a preset second time interval;

S3332: counting the original data of the expansion of the safety belt in the second time interval according to the second time interval;

S3333: calculating the real-time respiratory rate of the sitting target according to the original data and the second time interval;

s3334: and when the real-time respiratory rate is in a preset respiratory rate interval of children, determining that the target to be identified is the children.

Preferably, the S3333 includes:

s33331: filtering the original data, and outputting the filtered original data;

S33332: inputting the initial data into a pre-trained machine learning model for secondary correction, and outputting corrected target data, wherein the target data at least comprises: the number of belt stretches and the number of belt contracts, the machine learning model being constructed based on at least one of the following algorithms: support vector machine, random forest and deep learning model.

In a second aspect, embodiments of the present invention also provide a seating sensing system on a child safety seat, the system comprising: the seat comprises a seat body, a pressure detection unit, a controller and an infrared pyroelectric sensor, wherein the seat body is detachably arranged in a vehicle and is used for taking a child; the pressure detection unit is arranged in the headrest area, the backrest area and the seat surface area and is used for bearing pressure and transmitting a trigger signal to the controller; the infrared pyroelectric sensor is arranged in the head rest, the backrest and the seat surface area of the seat and is used for collecting real-time thermal infrared radiation intensity and transmitting collected data to the controller; the controller for implementing a seating sensing method on a child safety seat according to any one of claims 1-8.

Preferably, the pressure detection unit includes: the first Mylar film, the supporting material and the second Mylar film, wherein conductive tin foils are respectively stuck on the upper Mylar film and the lower Mylar film.

In summary, the beneficial effects of the invention are as follows:

the invention provides a seating induction method and a system for a child safety seat, wherein the method comprises the following steps: the method comprises the steps of obtaining pressure sensing triggering information of a preset area on the child safety seat, wherein the preset area at least comprises: a headrest area, a backrest area, and a seating surface area; according to the pressure sensing triggering information, if the seating surface area is detected to be triggered, determining that a target to be identified is seated; when the target to be identified is determined to be seated, if the backrest area is triggered and/or the headrest area is triggered, determining that the target to be identified is a child; and when the child is determined to be sitting, controlling the safety seat to work. According to the invention, the triggering conditions on the seat can be monitored more comprehensively by arranging a plurality of preset areas including the headrest, the backrest and the seat surface area, as the headrest and the backrest area are closely related to the seating position of the child, the multi-area triggering recognition can improve the accuracy of seating sensing, meanwhile, by detecting the seating of the object to be recognized and further seating the child, different recognition levels are added, the child seating sensing is further used as starting conditions, the child and other non-child objects such as books, clothes and pets can be further accurately distinguished, when the seating of the object to be recognized is determined, the child seating is recognized if the backrest area is detected to be triggered and/or the headrest area is triggered, the child seating is only recognized, the false-contact condition caused by other objects is further avoided, once the child seating is recognized, the function of controlling the heating of the safety seat is also provided, the child seating sensing is used as starting conditions for ensuring the comfort and safety of the child on the seat, and the child seating is better experience is provided through timely heating control. Therefore, the invention improves the accuracy and the practicability of the child sitting sensing through the multi-region triggering, the differential recognition and the heating control function, and simultaneously considers the comfort and the safety of the child.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described, and it is within the scope of the present invention to obtain other drawings according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a seating sensing system on a child safety seat according to embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of a pressure detecting unit in embodiment 1 of the present invention;

FIG. 3 is a flow chart showing the overall operation of the method for sensing seating in a child safety seat according to embodiment 2 of the present invention;

fig. 4 is a flow chart of acquiring a trigger condition of a preset area in embodiment 2 of the present invention;

FIG. 5 is a flow chart of obtaining initial densities of supporting materials in a seating area according to embodiment 2 of the present invention;

FIG. 6 is a flow chart of the present invention in embodiment 3 for further identifying child seating by real-time thermal infrared radiation intensity of each of the predetermined areas;

FIG. 7 is a schematic flow chart of matching the real-time temperature and the target temperature in embodiment 3 of the present invention;

FIG. 8 is a flow chart of acquiring a real-time temperature average value in embodiment 3 of the present invention;

FIG. 9 is a flow chart of the invention in embodiment 4 for identifying child seat placement based on respiratory rate;

fig. 10 is a schematic flow chart of preprocessing the collected original data of the belt retractor in embodiment 4 of the present invention;

The labels in the figures are as follows:

1-a seat body; a pressure detection unit of 21-seat surface area; a pressure detection unit of the 22-backrest region; 23-a pressure detection unit of the headrest area; 3-an infrared pyroelectric sensor; 41-upper Mylar; 42-lower Mylar; 5-conductive tin foil; 6-supporting material.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. If not conflicting, the embodiments of the present application and the features of the embodiments may be combined with each other, which are all within the protection scope of the present application.

Example 1

Referring to fig. 1, embodiment 1 of the present invention discloses a seating sensing system on a child safety seat, the system comprising: the seat comprises a seat body 1, a pressure detection unit 21, a pressure detection unit 22 and a pressure detection unit 23, a controller (not shown) and an infrared pyroelectric sensor 3, wherein the seat body 1 is detachably arranged in a vehicle and is used for taking a child; the pressure detection units 21, 22 and 23 are arranged in the head rest, the backrest and the seat surface areas of the seat and are used for bearing the seating pressure of children and transmitting trigger signals to the controller; the infrared pyroelectric sensor 3 is arranged in the head rest, the backrest and the seat surface area of the seat and is used for collecting real-time thermal infrared radiation intensity and transmitting collected data to the controller; the controller is used for realizing the seating sensing method on the child safety seat.

Specifically, the seating sensing system on the child safety seat provided by the embodiment of the invention comprises: the seat body 1 is a removable seat, typically mounted in a vehicle interior, for seating a child. It provides a safe and comfortable seat for children to use; the pressure detection unit 2 is positioned in the headrest, backrest and seat surface areas of the seat and is used for sensing and bearing the pressure exerted on the seat when a child sits on the seat; wherein the headrest area is the top portion of the child safety seat for providing support and protection for the head and neck, is generally located at the top of the seat and has a suitable curvature to ensure that head movements can be effectively reduced in the event of an accident, the position of the headrest area should be located directly above the child's head and the height should be adjusted according to the child's age and height to ensure proper support for the head, the headrest area is generally connected to the backrest area to provide overall head and neck protection; the back region is the back portion of the child safety seat for providing support and protection of the torso, and is generally located directly behind the back of the child, ensuring that the torso is firmly supported in the event of an accident, thereby reducing the risk of injury to the spine and torso, and is generally located with the headrest region to ensure overall body support and protection, and is also angled appropriately to maintain the child's body in the correct position; the seat area is the seat portion of the child safety seat for supporting the buttocks and thighs of the child, and is generally positioned in front of the backrest area to ensure proper support and stability of the child's body, the seat area is positioned to ensure that the thighs of the child are in a horizontal position, and the knee bending angle is proper to ensure comfort and safety of the child. The relative positions of the regions are interrelated to provide overall protection, the headrest and backrest regions are typically closely connected to ensure that the head and torso are supported and to mitigate the risk of neck and back injuries, and the seat region is located in front of the two regions to ensure proper support of the child's lower torso. When a child sits on the seat, the pressure detection unit generates a trigger signal and transmits the signal to the controller; the infrared pyroelectric sensors 3 are also arranged in the headrest, backrest and seat surface areas of the seat, and are used for collecting real-time thermal infrared radiation intensity data, providing temperature information of the seat area and being used for assisting the detection of seating of children; and (3) a controller: the controller is the core of the system and receives data from the pressure sensing unit and the infrared pyroelectric sensor. The controller implements a seating sensing method to determine whether a child is seated based on the data. The system avoids the interference of pets or other articles, and improves the accuracy of the child seating induction realized on the child safety seat.

In an embodiment, referring to fig. 2, the pressure detecting unit includes: the first Mylar film 41, the supporting material 6 and the second Mylar film 42, wherein the upper and the lower Mylar film are respectively stuck with the conductive tin foil 5.

In particular, the upper and lower parts of the pressure detecting unit 2 are constituted by Mylar sheets, which are critical supporting structures, said Mylar sheets 41 being able to sense, through bending and stretching, the pressure exerted on the seat when the child sits, their materials and design being generally carefully chosen to ensure that they are not fatigued during long-term use, with good durability. Conductive copper foil 5 (or other alternative material): the Mylar is stuck with conductive copper foil 5 for transmitting the trigger signal of the pressure detection unit 2, and the conductive copper foil can be replaced by other conductive materials, but the main function of the conductive copper foil is to transmit the trigger signal to a controller of the system for further analysis; the supporting material 6 is a key component and is positioned between the Mylar sheets, the design shape of the supporting material 6 is generally in a shape of Chinese character 'ri' to provide uniform support, the triggering sensitivity can be controlled by adjusting the density and the height of the supporting material 6, the necessary characteristics of the supporting material 6 include supporting property, compression deformation, automatic recovery of uncompressed state and water resistance, and the optional characteristics are at least one or more of the following materials: the silica gel sponge, the polyurethane sponge and the memory cotton, because the supporting material 6 supports, upper and lower conductive copper foil 5 does not contact and form the short circuit, when the supporting material 6 bears the preset pressure, the conductive copper foil 5 can form the short circuit, and the greater the density of the supporting material 6 is, the greater the pressure that can bear is, the harder the corresponding area is triggered. Since child safety seats may be used in a variety of environmental conditions, the water resistance is very important, and the connection between the support material 6 and the Mylar is typically glued with a water resistant adhesive to ensure that the interior cavity is not subject to moisture or humidity, which helps maintain the stability and reliability of the device. The pressure detection unit 2 needs to remain stable and reliable in use by the child. Thus, the Mylar sheets 41 and 42, the support material 6 and other related components must have excellent durability to withstand long-term use and stress by children without losing their performance. In summary, the pressure detection unit is designed and constructed to ensure its proper operation on a child safety seat with good durability, waterproof performance and sensitivity to achieve a reliable seating detection function.

Example 2

In a complete system, where hardware alone is not sufficient to achieve the full functionality and optimum performance required, in order to ensure that the hardware is able to function in the intended manner and work in concert with other components, a specially designed software control method is required, and the following example 2 will focus on describing how the previously mentioned hardware components are controlled and managed by software to ensure stable, efficient and reliable operation of the overall system.

Referring to fig. 3, embodiment 2 of the present invention discloses a seating sensing method on a child safety seat, the method comprising:

Specifically, pressure sensing triggering information of a preset area on the child safety seat is obtained, wherein the preset area at least comprises: a headrest area, a backrest area, and a seating surface area; the headrest, backrest and seating surface areas are the most easily triggered areas in a child safety seat because they are typically associated with the child's body support and posture adjustment, when the child sits on the seat, the head will typically rest on the headrest, the back will rest against the back, the bottom will rest on the seating surface, and this typical seating posture will create significant pressure or touch on these three areas, triggering the sensing system. Meanwhile, when a child safety seat is concerned, it is necessary to consider other articles that may be placed on the seat, such as pets, books, clothing, etc., which do not produce trigger conditions similar to those of a child in the headrest, backrest and seating surface areas, for example, the pet is of a different volume and shape than the child, and the book or clothing does not normally produce constant weight in the headrest and backrest areas. Through monitoring the triggering conditions of the backrest, the backrest and the seat surface area, the child safety seat can more accurately identify whether a child is successfully seated, the high accuracy ensures the timeliness of subsequent starting of seat adjustment, and meanwhile, unnecessary waste of working resources is avoided.

In one embodiment, referring to fig. 4, the step S1 includes:

In particular, obtaining an initial density of the support material in the pressure detection unit in each preset zone, for example, the support material of the headrest zone may be set to a first initial density, which is a relatively low density, since the pressure normally exerted by the head is small after seating of the child, said first initial density allowing rapid deformation of the support material when the head approaches, triggering the sensing system, such an arrangement being sensitively detectable even with slight head contact; the support material of the backrest region is provided in a second initial density, the first initial density being less than the second initial density, the support material of the second initial density providing suitable support when a child sits on the seat. When a child sits, pressure is applied to the back area, the support material will deform rapidly, ensuring that the back area is triggered. The seat surface area is provided with a plurality of seating detection units, so the seat surface area is composed of a plurality of supporting materials, the average density of the plurality of supporting materials is the third initial density, meanwhile, the second initial density is smaller than the third initial density, because the pressure on the seat surface area is maximum when a child seats, the pressure on different areas of the seat surface is influenced by the sitting postures of the child, and therefore, the seat surface area can be accurately triggered by the plurality of supporting materials when the child seats.

In one embodiment, referring to fig. 5, the step S11 includes:

Specifically, the seat surface area is divided into a plurality of target areas such as the front part of the seat surface, two sides of the seat surface and the rear part of the seat surface, and the seat surface is divided into different areas, so that the sitting condition of the child can be sensed more carefully, and the different areas can be stressed by different parts, such as thighs and buttocks of the child. The partition can more accurately capture the seating state of the child, and the seating area is ensured to be triggered accurately.

In particular, different body parts require different degrees of support to maintain accuracy of triggering, and by providing different densities of support material in different regions of the seat, the most appropriate triggering conditions can be provided for each part. For example, a first target density corresponding to the front portion of the seat surface, a second target density corresponding to both sides of the seat surface, and a third target density corresponding to the rear portion of the seat surface, the second target density being less than the first target density, the first target density being less than the third target density; since the front of the seat surface is typically subjected to less pressure than the sides of the seat surface while the sides of the seat surface are typically subjected to less pressure than the rear of the seat surface, this pressure distribution pattern can be explained by the physical configuration and sitting posture characteristics of the child, which is typically shorter in the thighs and relatively lighter in the front, and therefore is typically subjected to less weight and pressure when they are seated in the seat, due in part to the child's body shape and sitting posture; the seat surface is typically moderately stressed on both sides because these areas bear the weight of the buttocks and waist of the child, in part because the buttocks and waist are distributed on both sides of the seat when sitting; the rear of the seat is typically subjected to significant pressure because this part bears the weight of the torso and back of the child, which may tilt to the rear of the seat when the child is sitting on the seat, subjecting the rear of the seat to additional pressure. This pressure distribution pattern reflects the natural distribution and sitting posture characteristics of the body parts of the child when sitting in the seat, and in order to improve the comfort and support of the child safety seat, the seat should be designed to take into account this pressure distribution and use different densities of support materials at the front, sides and rear of the seat to ensure that each region is optimally supported, which helps to improve the accuracy of the child sitting sensing trigger.

Specifically, the first, second and third target densities are averaged to obtain a third initial density, and the target densities for different regions are combined to create an overall density setting such that the third initial density is greater than the second initial density.

Specifically, according to the preset age and weight of the child, adjusting each initial density so that the supporting material can bear preset pressure; for example, for infants (0-12 months), for older infants, the density setting of the seat may need to be adjusted according to their weight, as infants are lighter in weight, require softer support, the support material may be set to a lower density to accommodate the light weight and tender body of the infant; infants (1-4 years): as the child grows, their weight increases gradually, so that at this stage the initial density of the seat pre-set area may increase moderately to provide a firmer support, and the support material density may be adjusted gradually upwards to ensure adequate support as the child's weight increases; school-age children (5-12 years): the weight of the school-age children can be increased along with the increase of the age, so that the initial density of the preset area can be further adjusted upwards to meet the larger weight demand of the school-age children, and the density of the supporting material can be gradually adjusted upwards according to the increase of the weight of the school-age children; teenagers (13 years old and older): for teenagers, the initial density of the seat may be set to a higher level to cope with their greater weight, and the preset support material density may be further adjusted up to ensure adequate support is provided to prevent excessive sinking and discomfort, taking into account the weight of the teenager. The density of the seat is adjusted in a personalized way by comprehensively considering the age and the weight of the child, so that the support material can bear preset pressures of different weights and different age stages, and the triggering accuracy of the child sitting safety seat is further improved.

Specifically, the triggering of the corresponding areas of support material is to enhance child safety, when a child sits on the seat, their weight is exerted on the support material, causing pressure, since the support material has a density, i.e. a certain pressure threshold is preset, if the actual pressure exceeds this threshold, the corresponding areas of support material will be triggered to indicate that the child has been sitting on the seat. By setting the preset pressure and the corresponding trigger mechanism, it is ensured that the child is only considered to be seated when actually sitting in the seat and applying sufficient pressure, which avoids false positives or misjudgments, ensuring that the child will only be effective when being confident that it is seated.

specifically, if the seating surface area triggers, it will be identified as a target for seating, where the target may be a child, and possibly other non-child items, and the triggering of the seating surface area does not only indicate that a child is sitting on the seat, but also that other items are misplaced on the seat, such as books, pets, or clothing, and so on, therefore, not only pressure triggering is detected, but further analysis and judgment is required to determine whether the object on the seat is a child or other item; this differential identification is critical to ensure proper operation of the child safety seat, and if a child is identified, corresponding safety measures, such as locking or adjusting the seat, may be taken to ensure child safety, and if a non-child item is identified, false triggers may be avoided to prevent unnecessary tampering or alerting.

Specifically, when the target sitting is identified, whether the sitting surface and the backrest area are triggered simultaneously or not or whether the headrest, the backrest and the sitting surface area are triggered simultaneously is further checked, and if the sitting surface and the backrest area are triggered simultaneously or the headrest, the backrest and the sitting surface area are triggered simultaneously, the child sitting is identified. This is to improve seating accuracy and reliability, and it ensures that not only the bottom of the seat is triggered, but also the simultaneous triggering of the seat and back, or the simultaneous triggering of three areas of the headrest, back and seat are required, which is more likely to indicate that the child is actually sitting on the seat, since the seating condition of the child typically involves intimate physical contact with the bottom of the seat and back. By improving the accuracy of seating a child and reducing the likelihood of false identifications, this helps ensure that the child safety seat will perform the relevant operations only when it is really needed, thereby improving the reliability and safety of the overall system.

Specifically, when the child sits, the thermal insulation mode is automatically started, which is realized by triggering the temperature sensor S2 on the seat when the child sits, so long as the temperature Tt2 detected by the temperature sensor is between the user-defined temperatures T1 and T2, the heating plate will keep the working state, and a proper temperature is provided for the child; when the child leaves the seat, the temperature of Tt2 gradually returns to ambient temperature, and the heating is automatically turned off, so that energy is saved and overheating is prevented. By accurately detecting the child seating sensation, after the child is detected to be successfully seated, the child is provided with a warm and comfortable experience on the seat, and the seat temperature is ensured to be kept within a safe range, so that the energy is saved while the requirements of users are met.

Example 3

In embodiment 2, when the seat surface area is triggered, or the seat surface area and the backrest area are triggered simultaneously, or the seat surface area, the headrest and the backrest area are triggered simultaneously, a child is identified, however, when the seat surface area is triggered, or the seat surface area and the backrest area are triggered simultaneously, or the seat surface area, the headrest and the backrest area are triggered simultaneously, it is not necessarily represented that the child is sitting, which may be that other articles trigger these areas, such as pets, books, clothes or other weights, in order to improve the accuracy of the child sitting sensing, the temperature of the seat surface area, the headrest and the backrest area is introduced to be detected for further improvement.

In one embodiment, referring to fig. 6, the step S3 includes:

in particular, the intensity of thermal infrared radiation refers to the intensity of infrared thermal radiation emitted by an object, which is related to the temperature of the object. In the context of a seat, when a child sits in the seat, their body will emit infrared thermal radiation, while other objects (e.g., books, clothing, etc.) will not typically emit such infrared radiation, and when a seating area is triggered or multiple areas are triggered simultaneously, the real-time thermal infrared radiation intensity of each of the predetermined areas is acquired in a manner that may be accomplished by an infrared pyroelectric sensor or similar device. Monitoring the intensity of thermal infrared radiation in real time helps the system more accurately distinguish between child seating and other items, as only the child's body will generate higher thermal infrared radiation, while other items will not typically. By comprehensively using the pressure sensing of the seat area and the real-time thermal infrared radiation intensity of the infrared pyroelectric sensor, whether the child sits can be determined more reliably, and the child can be confirmed to sit only when the seat area is triggered, or the seat area and the backrest area are triggered simultaneously, or the seat area, the headrest and the backrest area are triggered simultaneously, and the thermal infrared radiation intensities are matched. The multiple sensing and verifying method improves the accuracy of seating sensing, reduces the risk of false triggering and ensures the normal operation of the seat system.

specifically, the real-time temperature value of each preset area is calculated according to a stefan-boltzmann formula, which is a basic physical law for calculating the radiation heat energy of an object, and the formula is as follows:

I＝εσT^4

In this formula, I represents a real-time thermal infrared radiation intensity value, epsilon is the emissivity, sigma is the stefan-boltzmann constant, and T represents a real-time temperature value. The Stefan-Boltzmann formula is established based on the radiation principle of the object, and shows the close relation between the radiation intensity of the object and the temperature of the object, and the temperature of the object is reversely deduced by measuring the thermal infrared radiation intensity radiated by the object. The thermal infrared radiation intensity of the sitting surface, the headrest and the backrest area is detected by the thermal infrared releaser, and since the thermal infrared releaser is a non-contact sensor, the infrared radiation emitted by the object can be measured without directly contacting the surface of the object, which is very advantageous for the sitting sensing of children, physical contact or interference can be avoided while ensuring the accuracy of measurement, and the temperature of the above area needs to be established with the surface of the object directly by the temperature detector, which is inconvenient for children, and furthermore, the temperature detector usually only can measure the temperature of the surface of the object with which it is directly contacted, but cannot accurately measure the temperature of the above area, since children in the above area are usually covered by the object (such as a cloth). In summary, the method for calculating the temperature value by using the thermal infrared releaser is a non-invasive and accurate method, and based on the radiation principle of the object, the method can effectively obtain the real-time temperature value of each preset area by measuring the thermal infrared radiation intensity, thereby providing reliable temperature information for the child sitting induction system.

In particular, big data analysis may provide general data about the temperature of the child's seating rear seat, backrest and headrest area. The data can be used for establishing a target temperature interval, and comparing a temperature value acquired in real time with a target temperature interval preset by big data. If the acquired real-time temperature values are within these intervals, then a match is considered to be made, and the child is identified as sitting.

In one embodiment, referring to fig. 7, the step S33 includes:

S331: obtaining a target temperature interval corresponding to each preset area, wherein the target temperature interval at least comprises: a first temperature interval corresponding to the seat surface area, a second temperature interval corresponding to the backrest area and a third temperature interval corresponding to the headrest area;

S332: acquiring a real-time temperature average value, wherein the real-time temperature average value at least comprises one of a first real-time temperature average value corresponding to a seat surface area, a second real-time temperature average value corresponding to a backrest area and a third real-time temperature average value corresponding to a headrest area;

Specifically, since the sitting postures of children may be different from one another due to individual differences, for example, a forward leaning sitting posture may result in a headrest area, and/or a backrest area is not contacted, real-time temperature means including at least one of a first real-time temperature means corresponding to the sitting surface area, a second real-time temperature means corresponding to the backrest area, and a third real-time temperature means corresponding to the headrest area are obtained in the headrest, sitting surface, and backrest areas.

In one embodiment, referring to fig. 8, the step S332 includes:

S3321: acquiring a preset first time interval;

In particular, a preset first time interval is acquired in order to acquire temperature data of the seat pan, headrest and backrest region during this time, the selection of which may depend on the response speed and performance requirements of the seat system. For example, the time interval may be set to acquire temperature data every 5 seconds.

Specifically, a real-time temperature value set of each preset area on the seat is acquired in each time interval, for example, in a first time interval, a temperature value set of a seat surface area, a backrest area and a headrest area is acquired: the temperature value set of the seat surface area is [30 ℃,31 ℃,29 ℃ and the temperature value set of the backrest area is [28 ℃,27 ℃,26 ℃ and the temperature value set of the headrest area is [32 ℃,33 ℃,31 ℃.

Specifically, the real-time temperature value set of each preset area is subjected to average processing to calculate a real-time temperature average value, wherein the real-time temperature average value reflects the overall temperature condition of different areas on the seat, for example, the real-time temperature average value of the seat surface area= (30 ℃ +31 ℃ +29 ℃)/3=30 ℃; real-time temperature mean of the backrest region= (28 ℃ +27 ℃ +26 ℃)/3=27 ℃; real-time temperature mean of headrest area= (32 ℃ +33 ℃ +31 ℃)/3=32℃. The temperature state of the seat is more comprehensively known by obtaining the real-time temperature average value of each area, and the average value is used for judging whether the child sits in the seat or not and whether the seat reaches a preset target temperature interval or not.

Specifically, if the first temperature average value is within the first temperature interval: assume that the first temperature interval is [28 ℃,32 ℃ ], and the real-time temperature average of the seating surface area is 30 ℃. As 30 ℃ is within this interval, it is identified that the child is sitting; the second temperature average value is within a second temperature interval: assume that the second temperature interval is [25 ℃,29 ℃ ], and the real-time temperature average of the backrest region is 27 ℃. As 27 ℃ is within this interval, it is identified that the child is seated; the third temperature average value is within a third temperature interval: assume that the third temperature interval is [29 ℃,35 ℃ ], and the real-time temperature average of the headrest area is 32 ℃. Since 32 ℃ is within this interval, it is recognized that the child is seated. The plurality of zone temperature averages are within respective intervals: the real-time temperature average of the seating surface area is assumed to be 30 ℃, the real-time temperature average of the backrest area is assumed to be 27 ℃, and the real-time temperature average of the headrest area is assumed to be 32 ℃. In this case, the temperature mean of all three regions is within the respective interval, also identified as child sitting; therefore, at least one real-time temperature average value is obtained, if at least one real-time temperature average value in the three areas is in the corresponding temperature interval, the child is judged to be sitting, and the accuracy of child sitting detection is further improved.

Example 4

In example 3, when the seat area is triggered, or the seat area and the backrest area are triggered simultaneously, or the seat area, the headrest and the backrest area are triggered simultaneously, temperature detection of each area is further introduced to identify that a child is sitting, however, more and more people choose to keep pets now, and the pets play an important role in families, and considering this trend, some people may start to consider the safety problem of the pets, including safety in vehicles, so that the pets may also appear on the safety seats, the body temperatures of the pets and the child are generally similar, and particularly at a certain environmental temperature, the body temperature ranges of the pets and the child may overlap, and for this reason, detection of respiratory frequency is introduced to further distinguish the child and the pet, thereby improving the accuracy of the child sitting detection.

In one embodiment, referring to fig. 9, S333 includes:

Specifically, if the first temperature average value is in the first temperature interval, and/or the second temperature average value is in the second temperature interval, and/or the third temperature average value is in the third temperature interval, obtaining that the child is seated, and obtaining a preset second time interval to be 1min at the moment; if the first, second and third temperature average values are not in the corresponding temperature intervals, the child is not seated, and the second time interval is not acquired.

in particular, during the second time interval, the system will record the extension and retraction of the seat belt. These raw data may include information about the number of stretches and contracts of the harness, and the time intervals between stretches and contracts, which will be used for subsequent calculation of the real-time respiratory rate, and children and pets are often active and may cause errors or noise such that the registration of the number of stretches is not always accurate. For example, a child may move on the seat, causing the seat belt to flex slightly, not necessarily reflecting actual respiratory activity.

In particular, to reduce the effects of errors and noise, some processing methods, such as filtering techniques or data smoothing algorithms, are employed to help remove instabilities due to the movements of children and pets, to improve the stability and accuracy of the data, and in addition, the system may set thresholds or filtering rules to exclude telescoping changes that do not characterize breathing, which helps reduce the effects of errors. Using the statistical raw data of stretch, the real-time respiratory rate of the seated subject is calculated, which typically involves analyzing the stretch and contraction patterns of the seat belt to determine the occurrence of respiratory activity.

Specifically, the calculated real-time respiratory rate is obtained, the real-time respiratory rate is compared with the normal respiratory rate of the child, the preset respiratory rate interval of the child is usually determined according to factors such as the age and physiological characteristics of the child, for example, the respiratory rates of the infant, the young child and the teenager may be different, and thus the interval may be adjusted accordingly. If the real-time respiratory rate falls within the preset child respiratory rate interval, it will be confirmed that the child is sitting, which means that the child is sitting on the seat, not other items or pets. Examples: assuming a preset breath rate interval of 20 to 30 times per minute for a child aged 3 to 5, the system calculates the real-time breath rate on the seat to be 25 times per minute, and since the real-time breath rate is within the preset interval, the system will confirm that the child is seated. The aim of this step is to match the physiological characteristics (breathing rate) with the preset child standard to improve the accuracy of seating the child, and the system will confirm that the child is seated only when the real-time breathing rate matches the child's breathing rate, thereby increasing the reliability of the seating detection.

In one embodiment, referring to fig. 10, S333 includes:

s33331: filtering the original data, and outputting the filtered original data;

In particular, the raw data (a record of the seat belt retractor) may contain movements and disturbances from children and pets. To reduce the effects of these disturbances, the system processes the data using filtering techniques, which typically involve the application of digital signal processing algorithms to remove high or low frequency noise components, thereby making the data smoother and more stable. Common filtering methods include mean filtering, median filtering, low pass filtering, and the like. The filtered initial data is used in subsequent processing steps to improve the reliability and accuracy of the data.

Specifically, the filtered initial data is input into a pre-trained machine learning model for further processing and correction, the task of the machine learning model is to further reduce errors and more accurately calculate the number of stretches and contracts of the seat belt, these target data being used to calculate the real-time breathing frequency. The machine learning model may be built on the basis of different algorithms including support vector machines, random forests and deep learning models, for example if a Support Vector Machine (SVM) is used, first filtered initial data is provided as input features to the SVM model, which may include time series data or sensor measurements, and using a historical dataset, the SVM model learns the relation between belt stretch pattern and actual breathing activity, which may be done by supervised learning, where the historical data includes known belt stretch and shrink times and corresponding actual breathing frequency, which may be used to correct the real time data once the model training is completed. The model maps the input belt stretching mode to more accurate belt stretching times and shrinkage times, and the corrected target data are used for calculating real-time respiratory frequency; if a random forest is utilized, the filtered initial data is also provided as input features to the random forest model. Using a historical data set, constructing a plurality of decision trees by a random forest model, wherein each tree learns the relation between a safety belt telescopic mode and actual respiratory activity, determining a final correction result by the random forest model through voting or averaging, and generating corrected target data for input data by each decision tree when real-time data is input into the model, wherein the final result is obtained by voting or averaging of all trees; the filtered initial data may also be input into the input layer of a deep learning model, typically consisting of multiple neural network layers, trained by a back propagation algorithm, using the deep learning model. The model automatically learns the feature representation, maps the belt retractor pattern to corrected target data to reduce errors, once the deep learning model training is completed, it can be used to correct real-time data, the model passes the input data to the various neural network layers, and generates corrected target data that will be used to calculate the real-time respiratory rate. The algorithm is trained according to historical data to know the relation between the belt stretching mode and the actual respiratory activity, and the output corrected target data comprise the stretching times and the shrinking times of the belt, and the data are used for calculating the real-time respiratory frequency. Through filtering processing and correction of a machine learning model, the system can improve the accuracy of a safety belt telescoping event, so that the real-time respiratory frequency is calculated more reliably, and the accuracy of seating detection is further improved.

In summary, the embodiments of the present invention provide a seating sensing method and system for a child safety seat.

It should be understood that the invention is not limited to the particular arrangements and instrumentality described above and shown in the drawings. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. The method processes of the present invention are not limited to the specific steps described and shown, but various changes, modifications and additions, or the order between steps may be made by those skilled in the art after appreciating the spirit of the present invention.

The functional blocks shown in the above-described structural block diagrams may be implemented in hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine readable medium or transmitted over transmission media or communication links by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include electronic circuitry, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio Frequency (RF) links, and the like. The code segments may be downloaded via computer networks such as the internet, intranets, etc.

It should also be noted that the exemplary embodiments mentioned in this disclosure describe some methods or systems based on a series of steps or devices. The present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, or may be performed in a different order from the order in the embodiments, or several steps may be performed simultaneously.

In the foregoing, only the specific embodiments of the present invention are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present invention is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and they should be included in the scope of the present invention.

Claims

1. A method of seating sensing in a child safety seat, the method comprising:

S4: controlling the safety seat to work when the child is determined to be sitting in the seat;

the S1 comprises the following steps:

s13: if the actual pressure born by the supporting material corresponding to the headrest area after the first initial density adjustment is greater than the first trigger pressure, detecting that the headrest area is triggered;

S15: if the actual pressure born by the supporting material corresponding to the seat surface area after the third initial density adjustment is greater than the third trigger pressure, detecting that the seat surface area is triggered;

the step S11 includes:

2. The method of seating sensing on a child safety seat according to claim 1, wherein S3 comprises:

3. The method of seating sensing on a child safety seat according to claim 2, wherein S33 comprises:

S333: and if the first real-time temperature average value is in the first temperature interval, and/or the second real-time temperature average value is in the second temperature interval, and/or the third real-time temperature average value is in the third temperature interval, determining that the target to be identified is a child.

4. A method of seating sensing in a child safety seat according to claim 3, wherein S332 comprises:

S3321: acquiring a preset first time interval;

5. The method of seating sensing in a child safety seat according to claim 4, wherein S333 comprises:

S3331: if the first real-time temperature average value is in the first temperature interval, and/or the second real-time temperature average value is in the second temperature interval, and/or the third real-time temperature average value is in the third temperature interval, acquiring a preset second time interval;

6. The method of seating sensing on a child safety seat according to claim 5, wherein S3333 comprises:

s33331: filtering the original data, and outputting the filtered original data;

7. A seating sensing system on a child safety seat, the system comprising: the seat comprises a seat body, a pressure detection unit, a controller and an infrared pyroelectric sensor, wherein the seat body is detachably arranged in a vehicle and is used for taking a child; the pressure detection unit is arranged in the headrest area, the backrest area and the seat surface area and is used for bearing pressure and transmitting a trigger signal to the controller; the infrared pyroelectric sensor is arranged in the head rest, the backrest and the seat surface area of the seat and is used for collecting real-time thermal infrared radiation intensity and transmitting collected data to the controller; the controller for implementing a seating sensing method on a child safety seat according to any one of claims 1-6.

8. The seating sensing system on a child safety seat according to claim 7, wherein the pressure detection unit comprises: the first Mylar film, the supporting material and the second Mylar film are respectively stuck with conductive tin foils.