Automatically adjustable mattress and smart bed

Abstract

The present invention relates to the technical field of intelligent adjustable beds, and specifically provides a sensor and an automatic adjustable mattress including the sensor. The sensor includes a sensing structure, which includes a sensing layer, which includes, from top to bottom, a flexible upper signal transmission layer, a pressure sensing layer, and a flexible lower signal transmission layer, the pressure sensing layer includes a dot matrix sensor, a strip sensor, or a discrete sensor, and a convex-concave structure or a hard material is provided on one side above and / or on one side below the sensing structure. The technical solution of the present application adopts a combination of an airbag and a flexible sensing structure, which correspond to the functions of adjustment and sensing, respectively. This arrangement can greatly reduce weight and cost while meeting functional requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent adjustable beds, and in particular to a sensor, an automatically adjustable mattress comprising the sensor, and an intelligent bed. Background Art

[0002] According to ergonomics, different parts of the body require different supports and different body pressures in different sleeping positions. From the perspective of maintaining health and balance, the normal physiological curvature of the spine needs to be maintained when lying flat or lying on the side. Ordinary mattresses on the market cannot meet this requirement and cannot give users a healthy sleep.

[0003] Considering the physiological curvature of the spine, the reasonable distribution of body pressure, and the smoothness of muscles and blood supply, it is necessary to make appropriate adjustments to the support of certain areas of the human body. In this case, the mattress needs to meet the requirements of low cost, easy mass production and promotion, light weight, easy transportation, and retain the inherent comfort of the mattress. The current solution is to use motors and mechanical structures to adjust the height of the mattress in multiple areas, and at the same time, it is equipped with a dot matrix sensor module. In theory, it can basically meet the above requirements, but the challenges are weight and cost, and in order to ensure comfort, the entire mattress will eventually be thicker.

[0004] From a technical point of view, it is necessary to sense and detect the pressure of various parts of the user's body and adjust it in real time. However, there is no intelligent adjustable mattress that can well realize this function in the current market.

[0005] Therefore, there is a great demand in the current market for mattresses with multiple zones that automatically adjust according to sleeping positions. Summary of the invention

[0006] The purpose of the embodiments of the present invention is to provide a sensor for a mattress and an automatically adjustable smart mattress, aiming to solve the problem that existing mattresses cannot achieve real-time adjustment according to sleeping posture and pressure at the same time, while taking into account cost, experience, weight and difficulty of industrialization.

[0007] An embodiment of the present invention is implemented as follows: a sensor for a mattress includes a sensing structure, which includes a sensing layer. The sensing layer includes, from top to bottom, a flexible upper signal conduction layer, a pressure sensing layer, and a flexible lower signal conduction layer. The pressure sensing layer includes a dot matrix sensor, a strip sensor, or a discrete sensor, and a convex-concave structure or a hard material is provided on the upper side and / or the lower side of the sensing structure.

[0008] Another object of an embodiment of the present invention is to provide an airbag sensing device, comprising a pressure sensor and an airbag, wherein the sensor is connected to a spring, the sensor and the spring are both located inside the airbag, and the pressure sensor is located at the top or bottom of the airbag.

[0009] Another purpose of an embodiment of the present invention is to provide a mattress, comprising the sensor provided by the present invention and an airbag, wherein a comfort layer is arranged above the sensor and a buffer layer is arranged below the sensor.

[0010] Another object of an embodiment of the present invention is to provide an airbag adjustable mattress, comprising multiple individual airbags, a transit airbag, an air valve and a discrete air tube, wherein the multiple individual airbags are connected to the transit airbag via discrete air tubes, an air valve is provided on the discrete air tube for controlling the flow of gas, and the caliber of the connection between the discrete air tube and the multiple individual airbags is larger than the caliber of the connection between the discrete air tube and the transit airbag.

[0011] The embodiment of the present invention also provides an airbag adjustable mattress, comprising a plurality of individual airbags, air valves and air pipes, wherein two adjacent individual airbags are connected at both ends through air pipes, and each air pipe is provided with an air valve to control the flow of air.

[0012] An embodiment of the present invention further provides an intelligent adjustable bed, comprising the airbag adjustable mattress of the present invention.

[0013] The technical solution of the present application adopts a combination of an airbag and a flexible sensing structure, which correspond to the functions of adjustment and sensing respectively. This setting can greatly reduce the weight and cost while meeting the functional requirements, and because the air pump and the flexible sensor are both non-rigid, it is easier to meet the comfort requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A mattress structure provided by an embodiment of the present invention;

[0015] Figure 2 It is a partial structure of a mattress provided by another embodiment of the present invention;

[0016] Figure 3 is a schematic diagram of the arrangement of the sensing layer in the sensor provided by one embodiment of the present invention;

[0017] Figure 4 A schematic diagram of a sensor structure provided by an embodiment of the present invention;

[0018] Figure 5 A schematic diagram of a sensor structure provided by another embodiment of the present invention;

[0019] Figure 6 A schematic diagram of a sensor structure provided by an embodiment of the present invention;

[0020] Figure 7 A schematic structural diagram of a sensing structure provided by another embodiment of the present invention;

[0021] Figure 8 A schematic structural diagram of a sensing structure provided by another embodiment of the present invention;

[0022] Fig. 9 A schematic diagram of a partition structure of a sensing structure provided by another embodiment of the present invention;

[0023] Fig.10 A schematic structural diagram of a sensing structure provided by another embodiment of the present invention;

[0024] Fig.11 for Fig.10 A cross-sectional view of the sensing structure shown;

[0025] Fig.12 A schematic structural diagram of a sensing structure provided by another embodiment of the present invention;

[0026] Fig.13 A schematic structural diagram of a sensing structure provided by another embodiment of the present invention;

[0027] Fig.14 A schematic structural diagram of a sensing structure provided by another embodiment of the present invention;

[0028] Fig.15 A schematic structural diagram of a sensing structure with a cut buffer layer provided by another embodiment of the present invention;

[0029] Fig.16 A schematic diagram of the structure of an airbag type sensor structure provided by one embodiment of the present invention;

[0030] Fig.17 A schematic diagram of the structure of an airbag type sensor structure provided by one embodiment of the present invention;

[0031] Fig.18 A schematic diagram of the structure of an air pressure sensor provided by an embodiment of the present invention;

[0032] Fig.19A A schematic diagram of the structure of a mattress provided by one embodiment of the present invention;

[0033] Fig.19B for Fig.19A Schematic diagram of the structure of the separate trachea;

[0034] Fig.19C for Fig.19A Schematic diagram of the air pump structure with sound insulation device;

[0035] Fig. 20A schematic structural diagram of a mattress provided by another embodiment of the present invention;

[0036] Fig.21 A schematic diagram of the structure of an airbag mattress provided by one embodiment of the present invention;

[0037] Fig. 22 A schematic diagram of a circuit structure of an embodiment of the present invention;

[0038] Fig.23 A system control flow chart provided for an embodiment of the present invention;

[0039] Fig.24 A schematic diagram of the structure of a low-pass filter used in one embodiment of the present invention;

[0040] Fig.25 A schematic diagram of the structure of a low-pass filter used in one embodiment of the present invention;

[0041] Fig.26 A circuit diagram of a multi-stage instrument amplification filter provided by an embodiment of the present invention;

[0042] Fig. 27 A sensor recognition process method provided by an embodiment of the present invention;

[0043] Fig.28 A torso recognition method process provided by one embodiment of the present invention;

[0044] Fig.29 The specific steps for determining sleeping posture provided by the embodiment of the present invention;

[0045] Fig.30 Specific steps for determining the symmetry (SYM) of the torso region provided by the embodiment of the present invention;

[0046] Fig.31 A schematic diagram of an adjustment algorithm for an intelligent adjustable bed provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] An embodiment of the present invention provides a sensor for a smart bed. The sensor may be a piezoresistive sensor, a pressure-capacitive sensor, or a strain gauge pressure sensor, depending on the material type.

[0049] Specifically, the sensor includes a sensing structure, which includes a sensing layer. The sensing layer includes, from top to bottom: a flexible upper signal conduction layer, a pressure sensing layer and a flexible lower signal conduction layer. The pressure sensing layer includes a dot matrix sensor, a strip sensor or a discrete sensor, and a convex-concave structure or a hard material is provided on the upper side and / or the lower side of the sensing structure.

[0050] In the embodiment of the present invention, the mattress can be divided into: a structure with independent sensing and adjustment modules (see Figure 1 ) and combined sensor airbag structure (such as Figure 2 shown). Figure 1 An embodiment of a mattress in which the sensing structure and the adjustment structure are independent of each other is shown, such as Figure 1 As shown, the mattress includes: a comfort layer, a sensor layer, a buffer layer and an airbag layer from top to bottom, wherein a buffer layer is arranged between the sensor layer and the airbag layer (adjustment structure), and the two are independent in space and do not affect each other. The airbag adjusts the height of the corresponding part of the mattress by inflating and deflating air. The sensor layer mainly includes: a flexible upper signal conduction layer, a flexible lower signal conduction layer, and a pressure sensing layer in the middle.

[0051] Figure 2 The embodiment of the sensor layer and the regulating layer being integrated into one is shown. In this embodiment, a sensor regulating layer is arranged under the comfort layer of the mattress, wherein the airbag is integrated into the sensor-regulating layer. This arrangement integrates the sensor layer and the regulating layer into one. Figure 1 The embodiment significantly reduces the thickness of the mattress and reduces the use of the cushioning layer, which also reduces the cost and weight.

[0052] The sensing layer used in the embodiment of the present invention can be set as a dot matrix sensor, a strip sensor or a discrete sensor. For a dot matrix sensor, also known as a surface dot matrix sensor, the sensor is a whole layered flexible film, which contains distributed sensing units arranged in a matrix, such as Figure 3 As shown, it shows the 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 can obtain the dot matrix pressure value of the sensor membrane.

[0053] In another embodiment, the sensor is a sensor composed of a plurality of strip-shaped sensing units. The sensor in this embodiment has a plurality of sensing units arranged side by side, such as Figure 4 As shown, each strip (sensing unit) includes multiple single sensors. Figure 3 The difference between the embodiments shown is that the strip-shaped sensors can be placed in any target area, that is, the settings are more flexible, and the pressure in certain areas can be monitored intensively through the density of the arrangement.

[0054] In another embodiment, the sensor is a discrete sensor, such as Figure 5 As shown, each point is an independent sensing unit, so that the sensing layer can achieve size adjustment and free position setting, relative to Figure 3 and Figure 4 The embodiment of the present invention is more flexible.

[0055] Figure 6 The distribution diagram of the sensing layer in one embodiment of the present invention is shown, and the sensor includes a flexible top signal layer and a flexible bottom signal layer, and a core sensing layer located between the two. The flexible top signal layer is also called a flexible top wiring layer, and the flexible bottom signal layer is also called a flexible bottom wiring layer. Above the sensing module is a comfort layer, and below is a buffer layer, which is used to isolate the sensing layer and the adjustment layer. The problem with this independent sensing structure is that the pressure on the surface of the mattress will be laterally distributed to the surroundings through the medium layer (comfort layer), resulting in the non-independence of the sensing data, thereby causing a certain deviation between the pressure on the sensing layer and the actual body pressure of the sleeper, making the detection result inaccurate. In order to reduce this deviation, the present invention proposes the following solutions: 1. Thickness compensation method, 2. Hardness compensation method, 3. Cutting separation method.

[0056] The first solution is the thickness compensation method. The specific implementation scheme is to place a convex-concave structure on or below the sensing unit, or to make the comfort layer above the sensing layer structure or the buffer layer below it into a concave-convex structure, or both of them are made into a concave-convex shape.

[0057] Figure 7 A schematic diagram showing a mattress structure in which the bottom cushioning layer is made into a concave-convex shape in one embodiment of the present invention, Figure 8 The embodiment in which both the buffer layer and the comfort layer are configured to be concave-convex is shown. The purpose of the concave-convex structure is that when the signal acts on the comfort layer, it will inevitably cause deformation of all materials in the thickness direction of the force-bearing area. Since the material of the sensing area of ​​the sensor is thicker than that of other areas (non-sensing areas), the pressure acts on the sensing area first. Therefore, under the condition of equivalent thickness, the elastic coefficient of the sensing area should be greater than the elastic coefficient of the surrounding area (non-sensing area, that is, the area that does not contain the sensing unit), such as Fig. 9 As shown, K1 represents the elastic coefficient of the sensing area, and K2 represents the elastic coefficient of the non-sensing area. As mentioned above, K1>K2. In this case, the pressure is preferentially distributed to the sensing area. This setting will reduce the lateral transfer of pressure, while improving the independence of the sensor and the detection sensitivity.

[0058] The second solution is the hardness compensation method, which is to pad a hard module on the top or bottom of the sensor unit, or to dig a groove on the comfort layer above the sensor unit or the buffer layer below the sensor unit and fill it with hard material. Fig.10 As shown in the figure, only the sensing layer structure is shown. A piece of hard material is placed in the sensing area. The elastic coefficient of this hard material is higher than that of the comfort layer. Therefore, the comprehensive elastic coefficient of the sensing area is higher than that of other areas (non-sensing areas), which can also achieve the purpose of making the sensor more independent. Fig.11 for Fig.10 The cross-sectional view of the sensing layer structure shown. The comfort layer of the mattress in the embodiment of the present invention is the structural layer at the top of the mattress closest to the user. The comfort layer may include the following materials: sponge, latex, memory foam, mountain palm, coconut palm, jute, gel factor latex, gel factor memory foam, gel factor sponge and bamboo charcoal fiber cotton.

[0059] Figure 12-14 A block diagram of an embodiment of a mattress with a firm pad (filler) is shown. Fig.12 The mattress shown is a mattress in which a portion of the thickness of the comfort layer is cut out on one side of the contact sensing area, and then filled with hard fillers. In another embodiment, the hard filler is filled into the bottom cushioning layer, such as Fig.13 In another embodiment, both the comfort layer and the cushioning layer are filled with hard pads. In another specific embodiment, the hard pads are placed above the bottom cushioning layer and below the sensing layer, as shown in FIG. Fig.14 shown.

[0060] The third solution is the cutting separation method, which specifically means that in the column direction of the sensor units, the upper comfort layer is cut to a certain thickness (the cutting marks may or may not pass through the comfort layer), so that the sensor units have better independence and avoid mutual interference. The specific structure is as follows: Fig.15 shown. Fig.15 The cutting lines of the middle comfort layer are parallel to each other and to the arrangement direction of the individual sensors.

[0061] In a preferred embodiment, the cutting separation scheme is Figure 4 The strip-shaped sensing unit shown is used in combination. And the cutting mark of the comfort layer corresponds to the edge of the strip-shaped sensing unit, so that the lateral conduction effect of the partition pressure is more significant.

[0062] The mattress provided in the embodiment of the present invention also includes an adjustment device. After the sensor detects the pressure condition of the mattress, it transmits the information to the adjustment device, and the adjustment device adaptively adjusts the height of the mattress surface to enable the user to obtain the most comfortable sleeping posture. The adjustment device used in the embodiment of the present invention can be an airbag adjustment device or other adjustment devices.

[0063] Another embodiment of the present invention provides a combined airbag type sensing structure, in which the sensor and the regulating airbag are an integral structure, namely, a regulating-sensing structure, such as Figure 2 As shown. In this way, after sensor identification, adjustments are made, and at the same time, sensor feedback is continuously performed to achieve more precise adjustments, effectively realizing the integration of sensor adjustment. The airbag-type sensor structure mainly includes three parts: the airbag, the sensor and the airflow meter. When pressure acts on the airbag, the elasticity of the airbag itself will offset part of the pressure, and the rest of the pressure acts on the sensor. Therefore, the force obtained on the sensor is not completely equal to the actual pressure, and there will be a slight deviation. The pressure shared or offset by the elasticity of the airbag itself is related to the air pressure in the airbag, so setting an airflow meter can compensate and correct the pressure of the sensor.

[0064] Specifically, the combined sensor airbag structure can be a sensor located at the top or bottom of the airbag, such as Fig.16 As shown, one end of the spring is connected to the top of the airbag, and the other end is connected to the pressure sensor, which is located at the bottom of the airbag. When pressure acts on the airbag, it is transmitted to the pressure sensor through the spring.

[0065] A pressure sensor may also be provided on the top or bottom of the airbag, and the pressure sensor may collect the pressure of the airbag area. Fig.17 shown. Fig.17 A similar integrated sensing and regulating effect can be achieved by rotating the structure shown in 180° (i.e., the pressure sensor is located above the airbag).

[0066] Another embodiment is Fig.18 As shown, the air pressure sensor is located on the wall of the airbag, or the air pressure sensor can also be located on the inner wall of the airbag. When the airbag is inflated or deflated, the air pressure in the airbag will inevitably change. When the airbag is under pressure, the air pressure sensor will also feel the corresponding change in pressure, thereby detecting the pressure condition.

[0067] The present invention also provides an airbag mattress adjustment structure, which is explained by the following specific embodiments:

[0068] Embodiment 1:

[0069] The mattress provided in this embodiment adopts the airbag adjustment method, such as Fig.19A As shown, the bottom of the mattress is composed of rows of individual airbags, each of which is connected to an air pipe, which is convenient for adjusting the pressure and lifting in a smaller area. The airbags and air pipes are connected to the transfer airbags, which are controlled by air valves in the middle. The transfer airbags are connected to the overall air pipe and air pump. The transfer airbags are used to store air pressure, which is convenient for regulating the individual airbags. The air valve and air pump control the operation of inflating and deflation of each airbag, thereby adjusting the softness and hardness of each airbag.

[0070] On the other hand, the discrete air pipes in the embodiment of the present invention are air pipes with varying calibers, such as Fig.19B As shown, the caliber of the trachea at the individual airbag is larger, and the caliber of the trachea at the transit airbag is relatively small. When the air pump is at the same pressure, the airflow velocity of the airbag can be reduced when inflating and deflating, and the sound of the airflow in the airbag can be reduced.

[0071] Preferably, the air pump is placed in a soundproof box and a buffer layer to slow down the vibration of the air pump and reduce the sound of the air pump. Fig.19C shown.

[0072] Embodiment 2:

[0073] Compared with Embodiment 1, this embodiment adds a motor module, such as Fig. 20 As shown, the motor module is connected to the transfer airbag via a screw and a nut.

[0074] In specific operation, the air pump is used to prefill the transfer airbag with sufficient air, and then the air pump is turned off. When in use, the corresponding air pipe is opened through the air valve, and the motor screw rotates to push the nut to squeeze or move away from the transfer airbag, thereby increasing the air pressure of the transfer airbag to press the air into the airbag inside the mattress, or reducing the air pressure of the transfer airbag to make the air in the airbag inside the mattress enter the transfer airbag, thereby adjusting the softness and hardness of the airbag.

[0075] Example 3

[0076] The mattress in this embodiment is as follows Fig.21 As shown, the bottom of the mattress is composed of a row of air bags, and the adjacent air bags are connected at both ends by air tubes. Each air tube is controlled by an air valve, so that two adjacent individual air bags can directly adjust the flow of air to each other through the air valve.

[0077] When a person lies on a mattress, where the pressure is higher, such as in the buttocks, the gas in the air bag with higher pressure will flow through the air pipe of the opened air valve to the air bag with lower pressure.

[0078] In this mattress, the airbags are divided into three parts by air valves, namely the head part, the spine part, and the leg and foot part, and the individual airbags inside the three parts can realize mutual circulation of airflow. Furthermore, the spine part includes the neck, shoulders, back, waist, and buttocks. When a person lies on the mattress, the pressure on the buttocks is greater and the pressure on the waist is less. The gas in the airbag where the buttocks is located flows into the airbag where the waist is located, thereby supporting the waist.

[0079] In addition, the valve opening and closing can be controlled by an algorithm to connect airbags with the same inflation and deflation, so that the designated airbags can be quickly inflated and deflated. Compared with embodiments 1 and 2, this embodiment has low manufacturing cost, light weight, and is easy to transport and install.

[0080] The improvement of the embodiment of the present invention is: the setting of reducing the sound of airflow: the caliber of the air pipe at the discrete airbag is larger, and the caliber of the air pipe of the transfer airbag is relatively small, which can reduce the sound of the airflow in the air pipe; in embodiment 2, the airbag of the mattress is inflated and deflated by squeezing the transfer airbag by a motor, reducing the sound caused by the air pump, and the speed of inflation and deflation can be controlled by changing the speed of the motor to reduce the sound of the airflow in the air pipe; for the mattress in embodiment 3: when different people lie on the mattress, the positions of the head part, the spine part, and the leg and foot area are different, by changing the position of the air valve switch, the position of the three parts can be adapted to the change in real time. This embodiment can significantly reduce production costs.

[0081] Circuit Structure

[0082] The mattress in the embodiment of the present invention also includes a circuit module structure, which mainly includes a sensor array scanning signal generating unit, a sensor signal amplifying and filtering unit, an AD unit, a main control unit (MCU) and an airbag control unit, such as Fig. 22 shown.

[0083] The circuit modules used in the embodiments of the present invention mainly include the following modules:

[0084] 1. Filtering and amplifying unit: mainly performs low-pass filtering and amplification on the small signals output by the sensor array;

[0085] 2. Signal scanning unit: forms the line scanning signal of the sensor;

[0086] 3. AD unit: converts the filtered and amplified signal into a digital signal through AD processing;

[0087] 4. MCU unit: mainly pre-processes the sensor signal after AD, and then performs sensor recognition algorithm and adjustment algorithm;

[0088] 5. Airbag control unit: mainly controls the driving module of the airbag inflation pump.

[0089] The system control process of the embodiment of the present invention is as follows Fig.23 shown.

[0090] Systematic key technical points of the present invention

[0091] 1. Signal noise processing

[0092] When a person lies still, the pressure is a static DC signal, and the change in pressure can be considered as a change in the DC operating point of the circuit. However, due to environmental factors, such as power frequency interference or micro-vibration of the environment, as well as circuit components and power supplies, noise will be introduced at the output end of the sensor signal. In severe cases, the signal noise will even drown out some effective signals with small amplitudes. Under the premise that the sensitivity of the sensor is certain, it is necessary to reduce the output noise of the signal. To this end, this application proposes to reduce signal noise and improve the signal-to-noise ratio by jointly reducing circuit noise reduction and algorithm noise reduction.

[0093] (1) Circuit noise reduction: using a low-pass filter

[0094] Since pressure is a static signal, it can be considered to have an extremely low frequency, while environmental and circuit noise is a white noise, that is, the noise is distributed in various frequency bands. Therefore, when designing the circuit, adding a low-pass filter at the sensor signal end will greatly reduce the environmental noise.

[0095] like Fig.24 As shown in the figure, a simple low-pass filter is provided. When the sensor produces impedance changes due to deformation, it will cause the output DC level to change. The low-pass filter structure composed of resistor R and capacitor C can realize first-order low-pass filtering, and its cut-off frequency f 0 :

[0096] Fig.25 Another low-pass filter circuit diagram of the sensing structure is given. Among them, R1, R2, R3 and R4 form a full-bridge structure. The resistance values ​​of R1 and R2 change in opposite directions, the resistance values ​​of R3 and R4 change in opposite directions, and the resistance values ​​of R1 and R3 change in opposite directions. When pressure acts on the sensor, it will cause a voltage difference between the + and - ends of the operational amplifier, and RC forms a low-pass feedback loop with a cutoff frequency f 0 for:

[0097] Fig.26 A multi-stage instrument amplifier filter circuit structure diagram is given, where R1=R2=R3=R4=R, R1, R2, R3 and R4 form a full-bridge sensor, the resistance values ​​of R1 and R2 change in opposite directions, the resistance values ​​of R3 and R4 change in opposite directions, and the resistance values ​​of R1 and R3 change in opposite directions. C1 and the output resistance of the sensor will form a first-order low-pass filter, and its cut-off frequency f 1 :

[0098] R5, C2, R6, and C3 form a second-order low-pass filter, where R5 = R6 and C2 = C3. The cutoff frequency f2 of the second-order low-pass filter is:

[0099] At the last output of the amplifier, R13 and C4 perform a third-order passive low-pass RC filter with a cutoff frequency of:

[0100] One or more of these three orders can be selected for filtering.

[0101] (2) Algorithm noise reduction:

[0102] Specific thresholds are set according to the characteristics of the sensor structure and the measured sensor value database to handle noise.

[0103] Algorithmic noise reduction mainly processes digital signals after AD. The main noise reduction methods include: signal digital filter, mean smoothing filter and image denoising.

[0104] The signal digital filter is achieved by adding a multi-order FIR or IIR low-pass filter with a cut-off frequency of 1 Hz to 100 Hz, and a 50 Hz power frequency notch filter to filter out power frequency interference.

[0105] Mean filtering can remove burr noise in some signals, that is,

[0106]

[0107] (3) Image denoising:

[0108] The sensor data is regarded as a piece of picture data, and the data of the sensor dot matrix corresponds to the value of each pixel on the picture. The image-related denoising algorithm is used for denoising, including morphological opening operation or morphological closing operation, etc. That is, the picture formed by the sensor data is binarized, and then the data is denoised by dilation first and then corrosion or corrosion first and then dilation.

[0109] 2. Recognition algorithm

[0110] The embodiment of the present invention also provides a sensor recognition method, which includes: number recognition, whether overweight, body movement, and sleeping posture recognition and adjustment algorithm, specifically as follows Fig. 27 shown.

[0111] 1. Sensor matrix data acquisition

[0112] The sensor array converts the pressure of each sensing area into voltage, which is then converted into a data signal through the ADC to obtain the pressure matrix S[r][c] of the entire bed, where r and c are the number of rows and columns of the array, respectively.

[0113] 2. Is there any human identification?

[0114] Each pressure value of the pressure matrix is ​​judged, and when all the pressure values ​​are less than the threshold value Sth1 for judging that no one is present, it is judged that no one is present.

[0115] 3. Overweight identification

[0116] Sum all the elements of the matrix, Sum(S[i][j]), if it exceeds the threshold Sowth1, it is judged to be overweight; or if an element S[i][j] in the matrix exceeds the second threshold Sowth2, it is also judged to be overweight.

[0117] 4. People recognition

[0118] Find the horizontal gradient, gradSx, of the matrix S, take the extreme value of gradSx[j] in each row, and determine the number of people by the number of extreme values.

[0119] 5. Identification of whether the person is lying normally

[0120] First, the pressure of the block is converted into an image. First, the edge of the image is identified, and then the pressure points are clustered to divide it into pressure blocks. Then the blocks are subjected to torso recognition. One method of torso recognition is to find the width of each row, and then take the number of rows with similar width as the torso part, and then find the length, width and length-to-width ratio of the torso part. If the length, width and length-to-width ratio are within a certain range, it is determined to be a normal lying sleeping posture, such as Fig.28 shown.

[0121] 6. Sleeping posture recognition algorithm based on SVM machine learning

[0122] The matrix pressure collected above is classified by support vector machine (SVM), and the sleeping posture is divided from 0 to 180° according to the angle between the normal vector of the plane of the trunk (direction: from the back to the chest) and the normal vector of the bed surface (direction: facing up), which can be divided into multiple levels, such as 0°, 45°, 90°, 135° and 180°. Among them, since the human trunk is bilaterally symmetrical, it does not distinguish whether the left half of the trunk is the support axis or the right half is the support axis, because for example, 45° with the left half as the support axis is equivalent to 135° with the right half as the support axis. Therefore, it is uniformly assumed here that the left half is divided into the support axis, then it can be found that 0° is supine, 180° is prone, and 90° is lying on the side. Therefore, we divide the sleeping posture into 5 types according to the angle between the normal vector of the trunk and the normal vector of the bed surface.

[0123] Specific steps are as follows Fig.29 As shown, where:

[0124] S1: The pressure matrix of 5 sleeping positions collected for training samples;

[0125] S2: Use the torso part recognition algorithm in [5] to identify the head and neck area, torso area, buttocks, and calf areas of the person;

[0126] S3: Calculate the eigenvalues ​​of the pressure matrix, which mainly include:

[0127] (1) The pressure ratio of the four body areas (head and neck area, trunk area, buttocks and calves),

[0128] (2) The gradient magnitude and gradient direction of the pressure pixel, for example, the gradient of the pixel (i, j):

[0129] Gi(i,j)=F(i+1,j)-F(i-1,j);

[0130] Gj(i,j)=F(i,j+1)-F(i,j-1);

[0131] G(i,j)=sqrt(Gi(i,j) 2 +Gj(i,j) 2 );

[0132] γ(i,j)=arctan(Gj(i,j) / Gi(i,j));

[0133] (3) Trunk area symmetry SYM:

[0134] SYM calculation process:

[0135] (4) SYM of the hip area;

[0136] (5) Variance of the center of gravity of each row of leg regions.

[0137] S4: Use the feature values ​​of each sleeping position obtained in S3 as the input of the SVM classifier

[0138] S5: Find the optimal classification hyperplane (w X) + b = 0 for the classifier between each two sleeping positions, and construct a Lagrangian function

[0139]

[0140] According to the duality of the Lagrangian function, the problem is transformed into:

[0141]

[0142] st α i ≥0, i=1, 2, …, n

[0143]

[0144] Finally, the optimal solution is obtained and the decision function is obtained.

[0145] S6: Find the decision function between two sleeping positions.

[0146] S7: By counting the votes, the one with more votes is recorded as the sleeping posture after final classification.

[0147] 7. Adjust the algorithm. The specific steps are as follows: Fig.31 As shown:

[0148] S1: Obtain the user's basic information, including: gender, height, weight, BMI, torso length, shoulder width, chest circumference, waist circumference, hip circumference and other information.

[0149] S2: Establish a static muscle model and a spinal model. The so-called static state does not consider the spatial position relationship between the trunk and the bed. The length direction of the trunk is consistent with the length direction of the bed, and the angle between the normal of the trunk and the normal of the bed is 0, which is used as a benchmark. The muscle model is the size of each part of the trunk, and the spinal model is the length of the spine and the curvature of several key nodes (cervical, thoracic, lumbar and coccygeal).

[0150] S3: The position of each area of ​​the user and the angle between the body direction and the length direction of the bed obtained through sleeping posture recognition.

[0151] S4: Obtain the angle between the normal phase of the trunk and the normal phase of the bed surface through the sleeping posture recognition in step 6.

[0152] S5: Combining S2, S3, and S4, the spatial model of the human body trunk and the bed can be obtained, that is, the positions of various parts of the human body trunk, including muscles and spine, are determined with the bed as the reference system.

[0153] S6: Calculate the height adjustment of each pixel matrix. The height adjustment can weigh the appropriate height adjustment under the muscle model and the height adjustment under the spine model as the final height adjustment. The ultimate goal of the height adjustment is to obtain the best fit between the bed surface and the spine, and to obtain the best force support for each part of the spine, while also taking into account the comfort of the muscles.

[0154] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sensor for a mattress, comprising a sensing structure, the sensing structure comprising a sensing layer, the sensing layer being arranged from top to bottom in sequence include: A flexible upper signal transmission layer, a pressure sensing layer and a flexible lower signal transmission layer, wherein the pressure sensing layer comprises a dot matrix sensor, a strip sensor or a discrete sensor, and: The upper side and / or the lower side of the sensing structure are provided with a convex-concave structure or a hard material; or: A hard module is placed on or below the pressure sensing layer; or: the structure above the pressure sensing layer is cut in the column direction of the pressure sensing layer; Furthermore, the sensor includes a sensing area and a non-sensing area, and the elastic coefficient of the sensing area is greater than the elastic coefficient of the non-sensing area.

2. The sensor according to claim 1, It is characterized in that The sensor further comprises an airbag structure, which comprises an airbag, a sensor and an airflow meter.

3. An airbag sensing device, comprising a pressure sensor and an airbag, wherein the sensor is connected to a spring, the sensor and the spring are both located inside the airbag, and the pressure sensor is located at the top or bottom of the airbag.

4. A mattress, comprising the sensor according to claim 1, and also comprising an airbag, wherein a comfort layer is arranged above the sensor and a buffer layer is arranged below the sensor, and a cut of a certain thickness is made on the comfort layer, and the cut may or may not penetrate the comfort layer.

5. The mattress according to claim 4, It is characterized in that The pressure sensing layer is a strip sensor, and the cutting direction is parallel to the arrangement direction of the single sensors in the strip sensor.

6. An airbag-adjustable mattress comprising a plurality of individual airbags, an air valve and an air tube, It is characterized in that It also includes a transfer airbag, wherein the trachea is a separate trachea, the plurality of individual airbags are connected to the transfer airbag through the separate trachea, the separate trachea is provided with an air valve for controlling the flow of gas, and the caliber of the connection between the separate trachea and the plurality of individual airbags is larger than the caliber of the connection between the separate trachea and the transfer airbag; Alternatively, two adjacent individual airbags are connected at both ends by tracheas, and each trachea is provided with an air valve to control the flow of airflow. The multiple individual airbags are divided into three parts as a whole, corresponding to the head part, the spine part and the leg and foot parts respectively, and the airflows in the individual airbags in the three parts can flow with each other.

7. The airbag-adjustable mattress according to claim 6, It is characterized in that The airbag-adjustable mattress further comprises a motor module, and the motor module is connected to the transfer airbag via a screw rod and a nut.

8. An intelligent adjustable bed, comprising the airbag adjustable mattress according to any one of claims 4-7.

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