CN213429315U

CN213429315U - Sensing device for mattress and mattress

Info

Publication number: CN213429315U
Application number: CN201821711142.9U
Authority: CN
Inventors: 孙成俊; 卢坤涛; 刘众; 乐勇
Original assignee: Shenzhen Granmore Technology Co ltd
Current assignee: Shenzhen Granmore Technology Co ltd
Priority date: 2018-06-12
Filing date: 2018-10-22
Publication date: 2021-06-15
Anticipated expiration: 2028-10-22
Also published as: WO2019237622A1; CN109171315A

Abstract

The utility model relates to an intelligent regulation bed technical field specifically provides a sensing device and mattress for mattress. This sensing device includes sensing structure, and this sensing structure includes the sensing layer, and this sensing layer top-down includes in proper order: the pressure sensing layer comprises a dot matrix sensor, a strip sensor or a discrete sensor, and a convex-concave structure or a hard material is arranged on one side above and/or one side below the sensing structure. The technical scheme of this application adopts the combination of gasbag and flexible sensing structure, and both correspond the function of regulation and sensing respectively. The arrangement can meet the functional requirements and reduce the weight and cost to a great extent.

Description

Sensing device for mattress and mattress

Technical Field

The utility model relates to an intelligent regulation bed technical field specifically, relates to a self-adjusting mattress and intelligent bed that is used for sensing device of mattress and includes this sensor.

Background

In different sleeping positions of people, according to human engineering mechanics, the support needed by each part of the body is different, and the body pressure of each area is different, so that from the perspective of keeping health and balance, when lying down and lying on the side, the normal physiological bending of the spine needs to be kept. The common mattress on the market at present can not meet the requirement, and the health sleep for the user can not be achieved.

Proper adjustment of the support of certain areas of the human body is required in view of the physiological curvature of the spine, the proper distribution of body pressure, and the smoothness of muscles and blood supply. Under this kind of condition, the mattress need satisfy simultaneously with low costsly, does benefit to the requirement of volume production and popularization, will light in weight simultaneously, does benefit to the transportation, but also needs to remain the originally comfort level of mattress. The existing scheme is that a multi-area height adjustment is achieved on a mattress in a mode of adopting a motor and a mechanical structure, meanwhile, a lattice sensing module is matched with the mattress, the requirements can be basically met theoretically, but the challenges are weight and cost, and finally the whole mattress is thicker in order to ensure comfort.

From a technical point of view, sensing and real-time adjustment of the pressure of various parts of the body of the user are required. But no intelligent adjusting mattress capable of well realizing the function exists in the products in the current market.

Therefore, there is a great need in the current market for a multi-zone mattress that automatically adjusts to sleeping posture.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a sensing device and an intelligent mattress that can automatically regulated for mattress, aim at solving current mattress and can't realize the problem of adjusting in real time according to the appearance of sleeping and pressure simultaneously, compromise simultaneously that the degree of difficulty is realized to cost, experience sense, weight and industrialization etc.

The embodiment of the utility model provides a realize like this, a sensing device for mattress, including sensing structure, this sensing structure includes the sensing layer, and this sensing layer top-down includes in proper order: the pressure sensing layer comprises a dot matrix sensor, a strip sensor or discrete sensing.

Preferably, the upper side and/or the lower side of the sensing structure is/are provided with a convex-concave structure or a hard material.

According to a preferred embodiment of the present invention, the sensor comprises a sensing region and a non-sensing region, and the elastic coefficient of the sensing region is greater than the elastic coefficient of the non-sensing region.

According to another preferred embodiment of the present invention, the sensing device further comprises a balloon structure including a balloon, a sensor and a gas flow meter.

Another object of the embodiment of the utility model is to provide a mattress, include the utility model provides a sensing device still includes the gasbag, the sensing device top is provided with comfortable layer, and the below is provided with the buffer layer, the cutting of certain thickness is carried out on the comfortable layer, the cutting pierces through or does not pierce through comfortable layer.

Preferably, the pressure sensing layer is a strip sensor, and the cutting direction is parallel to the arrangement direction of the individual sensors in the strip sensor.

The technical scheme of this application adopts the combination of gasbag and flexible sensing structure, and both correspond the function of regulation and sensing respectively. The air pump and the flexible sensor are not hard in texture, so that the requirement of comfort level is easily met.

Drawings

Fig. 1 is a mattress structure according to an embodiment of the present invention;

FIG. 2 is a partial structure of a mattress according to another embodiment of the present invention;

fig. 3 is a schematic diagram illustrating an arrangement of a sensing layer in a sensor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a sensor according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a sensor according to another embodiment of the present invention;

fig. 6 is a schematic structural diagram of a sensing structure according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a sensing structure according to another embodiment of the present invention;

fig. 8 is a schematic structural diagram of a sensing structure according to another embodiment of the present invention;

fig. 9 is a schematic view of a partitioned structure of a sensing structure according to another embodiment of the present invention;

fig. 10 is a schematic structural diagram of a sensing structure according to another embodiment of the present invention;

FIG. 11 is a cross-sectional view of the sensing structure shown in FIG. 10;

fig. 12 is a schematic structural diagram of a sensing structure according to another embodiment of the present invention;

fig. 13 is a schematic structural diagram of a sensing structure according to another embodiment of the present invention;

fig. 14 is a schematic structural diagram of a sensing structure according to another embodiment of the present invention;

fig. 15 is a schematic structural diagram of a sensing structure with a cut buffer layer according to another embodiment of the present invention;

fig. 16 is a schematic structural view of a balloon-type sensing structure according to an embodiment of the present invention;

fig. 17 is a schematic structural view of a balloon-type sensing structure according to an embodiment of the present invention;

fig. 18 is a schematic structural diagram of the air pressure including the air pressure sensor according to an embodiment of the present invention;

fig. 19A is a schematic structural view of a mattress according to an embodiment of the present invention;

FIG. 19B is a schematic view of the structure of the divided air tube of FIG. 19A;

FIG. 19C is a schematic view showing the structure of the air pump with a noise-damping device in FIG. 19A;

fig. 20 is a schematic structural view of a mattress according to another embodiment of the present invention;

FIG. 21 is a schematic view of an air bladder mattress according to an embodiment of the present invention;

fig. 22 is a schematic circuit diagram according to an embodiment of the present invention;

fig. 23 is a flowchart illustrating a system control according to an embodiment of the present invention;

fig. 24 is a schematic structural diagram of a low-pass filter according to an embodiment of the present invention;

fig. 25 is a schematic structural diagram of a low-pass filter according to an embodiment of the present invention;

fig. 26 is a circuit diagram of the multistage instrument amplifying and filtering according to an embodiment of the present invention;

fig. 27 is a sensing identification flow method according to an embodiment of the present invention;

fig. 28 is a flow chart of a trunk recognition method according to an embodiment of the present invention;

fig. 29 is a specific step of determining a sleeping posture according to an embodiment of the present invention;

fig. 30 shows specific steps for determining symmetry of torso region (SYM) according to an embodiment of the present invention;

fig. 31 is a schematic diagram of an adjustment algorithm of the intelligent adjustment bed according to an embodiment of the present invention.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

An embodiment of the utility model provides a sensor for intelligent bed, this sensor can be the pressure drag sensor according to the material type, also can be pressure capacity sensor, also can be strain gauge pressure sensor.

Specifically, this sensor includes sensing structure, and this sensing structure includes the sensing layer, and this sensing layer top-down includes in proper order: the pressure sensing layer comprises a dot matrix sensor, a strip sensor or a discrete sensor, and a convex-concave structure or a hard material is arranged on one side above and/or one side below the sensing structure.

In the embodiment of the utility model, the mattress can divide into according to sensing and adjusting module's relation: a sensing and conditioning independent structure (see fig. 1) and a combined sensing balloon structure (as shown in fig. 2). Fig. 1 shows an embodiment of a mattress with independent sensing and adjustment structures, which comprises, from top to bottom, as shown in fig. 1: comfort layer, sensing layer, buffer layer and gasbag layer, wherein be provided with the buffer layer in the middle of sensing layer and gasbag layer (adjusting the structure), both are independent in space, each other do not influence. The air bags are inflated and deflated to adjust the height of the corresponding part of the mattress. The sensing layer mainly comprises: a flexible upper signal conducting layer, a flexible lower signal conducting layer, and an intermediate pressure sensing layer.

Fig. 2 shows an embodiment in which the sensing layer and the adjustment layer are integrated, in which the sensing adjustment layer is provided under the comfort layer of the mattress, in which the air cells are integrated in the sensing-adjustment layer, and this arrangement integrates the sensing layer and the adjustment layer, which significantly reduces the thickness of the mattress and reduces the use of a cushioning layer, and on the other hand reduces the cost and weight, compared to the embodiment of fig. 1.

The embodiment of the utility model provides an in the embodiment used sensing layer can set up to dot matrix sensor, strip sensor or discrete sensing. For a dot matrix sensor, also called a planar dot matrix sensor, the sensor is a whole laminated flexible film, and inside the film is a matrix arrangement of distributed sensing units, as shown in fig. 3, which shows an arrangement of the sensing units, wherein the sensing units are arranged in an array, each row has a row of scanning lines, and each column has a signal output line. This arrangement allows the acquisition of a matrix-like pressure value of the sensor membrane.

In another embodiment, the sensor is a sensor composed of a plurality of strip-shaped sensor units, the sensor in this embodiment has a plurality of sensor units arranged side by side, as shown in fig. 4, each strip (sensor unit) includes a plurality of individual sensors, and this embodiment is different from the embodiment shown in fig. 3 in that the arrangement mode of the strip-shaped sensor can arbitrarily select a target area for placement, that is, the arrangement is more flexible, and the pressure in some areas can be monitored in an important manner by the density of the arrangement.

In another embodiment, the sensor is a discrete sensor, as shown in fig. 5, each point is an independent sensing unit, so that the sensing layer can realize size adjustment and free setting of position, and the arrangement is more flexible compared with the embodiment of fig. 3 and 4.

Fig. 6 shows a diagram of a sensor layer profile in an embodiment of the invention, the sensor including a flexible top signal layer and a flexible bottom signal layer, and a core sensor layer located therebetween. The flexible top signal layer is also referred to as a flexible top routing layer and the flexible bottom signal layer is also referred to as a flexible bottom routing layer. The upper part of the sensing module is a comfortable layer, and the lower part of the sensing module is a buffer layer used for isolating the sensing layer and the adjusting layer. The independent sensing structure has the problems that the pressure borne by the surface of the mattress is transversely distributed to the periphery through the medium layer (comfort layer), so that the independence of sensing data is caused, and the pressure borne by the sensing layer has certain deviation with the body pressure of an actual sleeper, so that the detection result is inaccurate. In order to reduce this kind of deviation, the utility model provides following several kinds of solutions: 1. thickness compensation method, 2 hardness compensation method, 3 cutting and separating method.

The first scheme, thickness compensation method, is to pad a convex-concave structure on or under the sensing unit, or to make the buffer layer on or under the sensing layer structure into a convex-concave structure or both.

Fig. 7 shows a schematic view of a mattress structure in which the bottom cushioning layer is made concave-convex in one embodiment of the present invention, and fig. 8 shows an embodiment in which both the cushioning layer and the comfort layer are provided in a concave-convex shape. The purpose of the concave-convex structure is to inevitably cause all material deformation in the thickness direction of the stressed area when a signal is applied to the comfort layer. Since the material of the sensing region of the sensor is thicker than the material of the other regions (non-sensing regions), pressure is preferentially applied to the sensing region, and therefore, the elastic coefficient of the sensing region should be larger than that of the surrounding region (non-sensing regions, i.e., regions not including the sensing cells) equivalent to the same thickness, as shown in fig. 9, where K1 denotes the elastic coefficient of the sensing region, and K2 denotes the elastic coefficient of the non-sensing region, and as described above, K1> K2. In this case, the pressure is preferentially distributed to the sensing area, and this arrangement will reduce the lateral transfer of pressure, and at the same time improve the independence of the sensor, and improve the detection sensitivity.

The second scheme, hardness compensation, is to fill hard material by padding a layer of hard module on or under the sensing unit, or grooving the buffer layer on or under the sensing unit. As shown in fig. 10, only the sensing layer structure is shown, and a hard material is padded in the sensing area, and the elastic coefficient of the hard material is higher than that of the comfort layer, so that the overall elastic coefficient of the sensing area is higher than that of other areas (non-sensing areas), and the purpose of more independence of the sensor can be achieved. Fig. 11 is a cross-sectional view of the sensing layer structure shown in fig. 10. The utility model discloses embodiment of the mattress comfort layer be the mattress top with the nearest structural layer of user. The comfort layer may include the following materials: sponge, latex, memory cotton, palm fiber, coconut fiber, jute, gel factor latex, gel factor memory cotton, gel factor sponge and bamboo charcoal fiber cotton.

Figures 12-14 show a block diagram of an embodiment of a mattress with hard pillows (fillers). Fig. 12 shows a mattress where the side of the comfort layer contacting the sensing area is cut out a portion of the thickness and then filled with a hard filler. In another embodiment, the hard filler is filled into the bottom cushioning layer, as shown in fig. 13. In another embodiment, both the comfort layer and the cushioning layer are filled with hard pads. In another embodiment, a hard spacer is placed above the bottom buffer layer and below the sense layer, as shown in FIG. 14.

The third scheme, cutting and separating method, specifically means that in the column direction of the sensing units, the upper comfort layer is cut by a certain thickness (the cutting mark can penetrate through the comfort layer or can not penetrate through the comfort layer), so that the sensing units have better independence and avoid mutual interference, and the specific structure is as shown in fig. 15. The cutting lines of the comfort layer in fig. 15 are parallel to each other and to the arrangement direction of the cell sensors.

In a preferred embodiment, this cut-and-separate scheme is used in conjunction with the strip-shaped sensor unit shown in fig. 4. And the cutting mark of the comfort layer corresponds to the edge of the strip-shaped sensing unit, so that the transverse conduction effect of the arranged partition pressure is more remarkable.

The embodiment of the utility model provides a mattress still includes adjusting device, and the sensor detects the pressure situation back that the mattress bore with information transfer for adjusting device, and this adjusting device carries out adaptability to mattress surface height and adjusts to make the user obtain the most comfortable sleep posture. The adjusting device used in the embodiment of the present invention may be an air bag adjusting device, or other adjusting device.

Another embodiment of the present invention provides a combined airbag type sensing structure, wherein the sensor and the adjusting airbag are an integral structure, i.e. an adjusting-sensing structure, as shown in fig. 2. Therefore, after the sensing identification, the adjustment is carried out, and meanwhile, the sensing feedback is continuously carried out so as to achieve more accurate adjustment, so that the integration of sensing adjustment is effectively realized. The combined air bag type sensing structure mainly comprises three parts, namely an air bag, a sensor and an air flow meter. When pressure acts on the air bag, the elasticity of the air bag can counteract part of the pressure, and other pressure acts on the sensor. The force obtained at the sensor is not exactly equal to the actual applied pressure, but will deviate somewhat, and the pressure that is shared out or cancelled out by the elasticity of the bladder itself is related to the air pressure inside the bladder, so that the air flow meter can be arranged to compensate and correct the pressure at the sensor.

Specifically, the integrated sensing airbag structure can be a sensor located at the top or bottom of the airbag, as shown in fig. 16, and one end of the spring is connected to the top of the airbag, and the other end is connected to a pressure sensor located at the bottom of the airbag. When pressure acts on the air bag, the pressure is transmitted to the pressure sensor through the spring.

A pressure sensor may also be provided on the top or bottom of the exterior of the bladder that can collect the pressure level in the area of the bladder as shown in fig. 17. A similar sense-and-adjust integration effect can be achieved with the structure shown in fig. 17 rotated 180 (i.e., the pressure sensor is located above the bladder).

Another embodiment is shown in fig. 18 where the air pressure sensor is located on the wall of the balloon, or alternatively, the air pressure sensor may be located on the inner wall of the balloon, which will necessarily cause a change in air pressure within the balloon when the balloon is inflated and deflated. When the air bag bears pressure, the air pressure sensor can also sense corresponding change of the pressure, and therefore the pressure bearing condition is detected.

The embodiment of the utility model provides a still provide an gasbag type mattress and adjust structure, explain through following specific embodiment:

example 1:

the mattress provided by the embodiment adopts an air bag adjusting mode, as shown in fig. 19A, the bottom of the mattress is formed by arranging a row of individual air bags, and each individual air bag is connected with an air pipe, so that the pressure and the lifting can be conveniently adjusted in a smaller area. The air bag and the air pipe are connected to the transfer air bag, the middle of the transfer air bag is controlled by the air valve, and the transfer air bag is connected with the air pump through the integral air pipe. The transfer air bag is used for storing air pressure, and is convenient for regulating and controlling the individual air bag. The operation of charging and discharging each air bag is controlled by the air valve and the air pump, thereby adjusting the hardness of each air bag.

On the other hand, the embodiment of the utility model provides an in the discrete trachea adopt the trachea of bore change, as shown in fig. 19B, the tracheal bore of individual gasbag department is great, and the trachea bore of transfer gasbag department is smaller, and it can be under the condition of air pump in the same pressure, reduces the air velocity of gasbag when inflating and deflating, reduces the sound of air current in the gasbag.

Preferably, the air pump is disposed in the soundproof case and the buffer layer for damping vibration of the air pump and reducing sound of the air pump, as shown in fig. 19C.

Example 2:

compared with the embodiment 1, the embodiment adds a motor module, as shown in fig. 20, the motor module is connected with the transfer airbag through a screw rod and a nut.

In the specific operation, the transfer airbag is pre-filled with sufficient gas through the gas pump, and then the gas pump is closed. When the air valve is used, the corresponding air pipe is opened through the air valve, the motor screw rod rotates to push the nut to extrude or keep away from the transfer air bag, so that the air pressure of the transfer air bag is increased to press air into the air bag in the mattress or reduce the air pressure of the transfer air bag to enable the air of the air bag in the mattress to enter the transfer air bag, and the hardness of the air bag is adjusted.

Example 3

In this embodiment, the mattress is shown in figure 21, in which the bottom of the mattress is formed by an array of air cells, adjacent cells are connected at both ends by air tubes, each air tube being controlled by an air valve, whereby two adjacent individual cells can directly regulate the flow of air through the air valves to each other.

When a person lies on the mattress, the air in the air bag with higher pressure flows to the air bag with lower pressure through the air pipe of the opened air valve in places with higher pressure, such as buttocks and the like.

In the mattress, the air bag is divided into three parts, namely a head part, a spine part and leg and foot parts through the air valve, and the individual air bags in the three parts can realize mutual communication of air flows. Further, the spine portion includes a neck, a shoulder, a back, a waist, and a hip. When a person lies on the mattress, the pressure of the hip is higher, the pressure of the waist is lower, and the gas in the airbag at the hip flows into the airbag at the waist, so that the waist is supported.

In addition, the valves can be controlled to be opened and closed through an algorithm, so that the air bags which are inflated and deflated in the same way are communicated, and the designated air bags can be inflated and deflated quickly. This embodiment is low in manufacturing cost, light in weight, and easy to transport and install, compared to embodiments 1 and 2.

The embodiment of the utility model provides an improve a little: setting to reduce airflow sound: the caliber of the air pipe at the position of the discrete air bag is larger, and the caliber of the air pipe of the transit air bag is smaller, so that the sound of air flow of the air pipe can be reduced; in the embodiment 2, the transfer air bags are extruded by the motor to inflate and deflate the air bags of the mattress, so that the sound caused by the air pump is reduced, and meanwhile, the speed of inflation and deflation can be controlled by changing the rotating speed of the motor, so that the sound of air flow in the air pipe is reduced; for the mattress in example 3: when different people lie on the mattress, the positions of the head part, the spine part and the leg and foot regions are different, and the position of the air valve switch is changed to adapt to the position change of the 3 parts in real time. This embodiment can significantly reduce production costs.

Circuit structure

The embodiment of the utility model provides an in the mattress still includes circuit module structure, and this circuit module structure mainly includes sensing array scanning signal generating unit, sensing signal amplification filtering unit, AD unit, Main Control Unit (MCU) and gasbag control unit, as shown in fig. 22.

The embodiment of the utility model provides a circuit module who adopts mainly contains following several modules:

1. a filtering and amplifying unit: the method mainly comprises the steps of carrying out low-pass filtering and amplification on small signals output by a sensor array;

2. a signal scanning unit: forming a line scanning signal of the sensor;

an AD unit: AD processing is carried out on the filtered and amplified signals to convert the signals into digital signals;

an MCU unit: preprocessing the AD-processed sensing signals, and then performing a sensing recognition algorithm and an adjustment algorithm;

5. an airbag control unit: mainly a driving module for controlling an inflator of an air bag.

The system control flow of the embodiment of the present invention is shown in fig. 23.

The utility model discloses a systematic key technology point

1. Signal noise processing

When a person lies still, the pressure is a static direct current signal, and the change of the pressure can be considered as the change of the direct current working point of the circuit. However, due to environmental factors such as power frequency interference or environmental micro-vibration, and due to circuit devices and power supplies, noise may be introduced at the output end of the sensing signal, and in severe cases, the noise of the signal may even drown out some effective signals with small amplitude. On the premise that the sensitivity of the sensor is constant, it is necessary to reduce the output noise of the signal. Therefore, the signal noise is reduced through circuit noise reduction and algorithm noise reduction, and the signal to noise ratio is improved.

(1) Circuit noise reduction: using low-pass filters

Since the pressure is a static signal and the frequency can be considered to be extremely low, and the environmental and circuit noises are white noises, that is, the noises are distributed in each frequency band, when the circuit is designed, the low-pass filtering is added at the sensing signal end, so that the environmental noises are reduced to a great extent.

As shown in fig. 24, a simple low-pass filter is provided, when the impedance of the sensor changes due to deformation, the output dc level changes, and the low-pass filtering structure composed of the resistor R and the capacitor C can realize low-pass filtering of the first order with the cut-off frequency f₀:

Fig. 25 shows a low pass filter circuit diagram of another sensing configuration. Wherein R1, R2, R3 and R4 form a group of full-bridge structures, the resistance values of R1 and R2 are opposite in change direction, the resistance values of R3 and R4 are opposite in change direction, and the resistance values of R1 and R3 are opposite in change direction. When a pressure is applied to the sensor, a voltage difference is induced across the operational amplifier +, -, and RC constitutes a low-pass feedback loop with a cut-off frequency f₀Comprises the following steps:

fig. 26 shows a structure diagram of a multi-stage instrument amplifying filter circuit with multi-stage low-pass and high-precision, wherein R1-R2-R3-R4-R, R1, R2, R3 and R4 form a group of sensors in a full-bridge structure, the resistance values of R1 and R2 are opposite in changing direction, the resistance values of R3 and R4 are opposite in changing direction, and the resistance values of R1 and R3 are opposite in changing direction. Wherein C1 and the output resistance of the sensor will form a first order low pass filter with a cut-off frequency f₁:

R5 and C2, R6, and C3 form a second-order low-pass filter, where R5 is R6, and C2 is C3. Cutoff frequency f2 of second-order low-pass:

at the output of the final stage of the amplifier, R13 and C4 are subjected to passive low-pass RC filtering of the third order, with cutoff frequency:

the third order can be arbitrarily selected to be a first order or a plurality of orders for filtering.

(2) And (3) performing algorithm noise reduction:

and setting a specific threshold value according to the characteristics of the sensing structure and the actually measured sensing value database, and processing noise.

The main algorithm noise reduction is to process digital signals after AD, and the noise reduction method mainly comprises the following steps: signal digital filter, mean smoothing filter and image denoising method.

The signal digital filter filters power frequency interference by adding a multi-order FIR or IIR low-pass filter, wherein the cut-off frequency can be 1HZ to 100Hz, and a 50Hz power frequency trap.

The mean filtering is to remove the glitch noise in some signals, i.e.

(3) Denoising an image:

and (3) regarding the sensing data as picture data, wherein the data of the sensing dot matrix corresponds to the value of each pixel point on the picture, and denoising by adopting a related denoising algorithm of the image, wherein the denoising algorithm comprises morphological open operation or morphological closed operation and the like. Namely, the image formed by the sensing data is subjected to binarization processing, and then expansion-first and corrosion-second or corrosion-first and expansion-second methods are carried out, so that the data is subjected to de-noising processing.

2. Recognition algorithm

The embodiment of the utility model provides a still provide a sensing identification method, it includes: the number of people, whether the people are overweight or not, the body movement, and the sleeping posture recognition and adjustment algorithm are specifically shown in fig. 27.

1. Sensing matrix data acquisition

The pressure of each sensing area is converted into voltage by the sensing array, and then the voltage is converted into a data signal by the ADC, so that a pressure matrix S [ r ] [ c ] of the whole bed is obtained, wherein r and c are the row number and the column number of the array respectively.

2. Presence or absence of human recognition

Each pressure value of the pressure matrix is judged, and if all the pressure values are smaller than the unmanned judgment threshold Sth1, the pressure matrix is judged to be unmanned.

3. Overweight identification

Summing all the elements of the matrix, Sum (S [ i ] [ j ]), and if the threshold Sowth1 is exceeded, determining that it is overweight; or if a certain element S [ i ] [ j ] in the matrix exceeds the second threshold Sowth2, it is also determined to be overweight.

4. People number identification

And solving a transverse gradient, gradSx, of the matrix S, taking an extreme value of gradSx [ j ] of each row, and judging the number of people according to the number of the extreme values.

5. Recognition of whether to lie normally

Firstly, the pressure of the block is converted into an image, firstly, the edge of the image is identified, and then, the pressure points are clustered, so that the pressure block is obtained by segmentation. Then, trunk recognition is performed on the block, and one method of trunk recognition is to find the width of each row, then use the number of rows with similar widths as trunk parts, then find the length, width and aspect ratio of the trunk parts, and if the length, width and aspect ratio are within a certain range, determine the sleeping posture of normal lying, as shown in fig. 28.

6. Sleeping posture recognition algorithm based on SVM machine learning

The acquired matrix pressures are classified by a Support Vector Machine (SVM), and the sleeping postures are classified from 0 to 180 degrees according to the included angle between the normal vector (direction: from the back to the chest) of the plane of the trunk and the normal vector (direction: right side up) of the bed surface, and can be classified into a plurality of grades, such as 0 degree, 45 degrees, 90 degrees, 135 degrees and 180 degrees. Since the torso part of the human body is symmetrical left and right, it is not distinguished whether the left torso half part is the supporting shaft or the right torso half part is the supporting shaft, because, for example, 45 ° with the left torso half part as the supporting shaft and 135 ° with the right torso part as the supporting shaft are equivalent. Therefore, by default, the left half is taken as the support axis, and it can be found that 0 ° is supine, 180 ° is prone, and 90 ° is lying on the front side. Therefore, we can divide the sleeping postures into 5 types from the angle between the normal vector of the trunk and the normal vector of the bed surface.

The specific steps are shown in fig. 29, wherein:

s1: collecting a pressure matrix of a training sample in the 5 middle sleeping position;

s2: adopting a trunk part identification algorithm in the step (5) to identify the head and neck region, the trunk region, the hip region and the large and small leg region of the person;

s3: calculating the eigenvalues of the pressure matrix, the eigenvalues mainly comprising:

(1) the pressure specific gravities of the four body regions (head and neck region, torso region, buttocks and calf region),

(2) the gradient magnitude and gradient direction of the pressure pixel, e.g. the gradient of pixel (i, j):

Gi(i,j)＝F(i+1,j)-F(i-1,j)；

Gj(i,j)＝F(i,j+1)-F(i,j-1)；

G(i,j)＝sqrt(Gi(i,j)²+Gj(i,j)²)；

γ(i,j)＝arctan(Gj(i,j)/Gi(i,j))；

(3) trunk area symmetry SYM:

calculation procedure of SYM:

(4) symmetry SYM of the hip region;

(5) variance of center of gravity of each row of leg regions.

S4, using the characteristic values of the sleeping postures obtained in the S3 as the input of the SVM classifier

S5: finding the optimal classification hyperplane (w X) + b ═ 0 of the classifier between every two sleeping postures, and constructing Lagrangian function

According to the duality of the Lagrangian function, the problem is converted into:

s.t.o_i≥0，i＝1，2，…，n

and finally, obtaining an optimal solution to obtain a decision function.

S6: a decision function between every two sleeping positions is obtained,

s7: and counting the votes, and recording the number of the votes as the finally classified sleeping postures.

7. The specific steps of the adjustment algorithm are shown in fig. 31:

s1: acquiring basic information of a user, comprising the following steps: sex, height, weight, BMI, length of torso, shoulder width, chest circumference, waist circumference, hip circumference, etc.

S2: and (3) establishing a muscle model and a vertebra model under a static state, namely, not considering the spatial position relation between the trunk and the bed, wherein the length direction of the trunk is consistent with the length direction of the bed, and the included angle between the normal phase of the trunk and the normal phase of the bed is 0 as a reference. The muscle model is the size of each part of the trunk, the spine model is the length of the spine, and the curvature of several key nodes (cervical, thoracic, lumbar and caudal).

S3: and identifying the positions of all areas of the user and the included angles between the body direction and the length direction of the bed through the sleeping posture.

S4: and (6) acquiring the included angle between the normal phase of the trunk and the normal phase of the bed surface through the sleeping posture identification in the step 6.

S5: by combining S2, S3 and S4, a space model of the human body trunk and the bed can be obtained, namely, the positions of the human trunk, including the positions of muscles and the spine under the reference frame of the bed, are determined.

S6: and calculating the adjusting height of each pixel dot matrix, wherein the adjusting height can balance the proper adjusting height under the muscle model and the adjusting height under the vertebra model to be used as the final adjusting height. The final aim is to obtain the best fit between the bed and the vertebra and the best force support for each part of the vertebra, and of course, to take the comfort of the muscles into account.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A sensing device for a mattress, comprising a sensing structure including a sensing layer, the sensing layer comprising in sequence from top to bottom: the pressure sensing layer comprises a dot matrix sensor, a strip sensor or a discrete sensor.

2. The sensing device according to claim 1, wherein the sensing structure is provided with a convex-concave structure or a hard material on the upper side and/or the lower side.

3. The sensing device of claim 1, wherein the sensing device comprises a sensing region and a non-sensing region, and wherein the sensing region has a higher modulus of elasticity than the non-sensing region.

4. The sensing device of claim 1, further comprising a balloon structure comprising a balloon, a sensor, and a gas flow meter.

5. A mattress comprising a sensing device according to claim 1, further comprising an air bladder, a comfort layer disposed over the sensing device and a cushioning layer disposed under the sensing device, the comfort layer having a thickness cut therein, the cut being made with or without penetrating the comfort layer.

6. The mattress of claim 5 wherein the pressure sensing layer is a strip sensor and the direction of the cut is parallel to the direction of the array of individual sensors in the strip sensor.