A real-time human sitting posture detection device and detection method

Abstract

A real-time human sitting posture detection device and detection method, belonging to the technical field of driving detection. The physical means of detecting the human posture is carried out through a detection module, which can provide data such as sitting posture changes and force changes in real time. The detection seat is detected in real time through an adjustment part in cooperation with an air flow sensor and a gas density meter. The force condition of the detection seat is calculated through calculation, and three-dimensional fitting is carried out by using a computer, providing analysis data for simulation experiments and driving simulation experiments, improving the detection accuracy of the seat force, and enhancing the recognition rate of driving sitting postures. The hardness of different part adjustment parts is adjusted through an air pump. The present invention can also be used in the field of customized seats, providing data such as dynamic sitting postures and force conditions when customizing seats.

Description

Technical Field

[0001] The present invention belongs to the technical field of driving detection, and more specifically relates to a real-time human sitting posture detection device and a detection method. Background Art

[0002] In the fields of automotive simulation experiments, simulated driving, etc., the two research directions are automotive performance and driver experience. In the research direction of driver experience, there are detections of the driver's eye fixation points, heart rate, skin conductance, etc., and there is also research on the sitting posture of the driver. Currently, there is a lack of means for accurate sitting posture detection. Commonly used methods are to identify through a camera and calculate using algorithms to analyze the sitting posture changes of the test subjects. The sitting posture is judged by the method of image recognition plus algorithm calculation. This type of method identifies sitting posture changes through methods such as bone calculation. The advantages are convenient and simple to use, but the disadvantages are prominent. Limited by the equipment accuracy and algorithm advancement, the recognition rate and accuracy of this type of technology are low, and it is only applicable to low-precision usage scenarios. In the prior art, there are also improvements to the seat itself, but these technologies do not involve improvements in real-time sitting posture recognition. Currently, there is no very directly related technology for sitting posture recognition through physical means.

[0003] In addition, in the technical field of customized seats, the existing technical means are to let a person sit into a mold in a semi-dry state through a mold to shape a human body model, and customize the seat according to the human body model. However, there is a big problem with this type of technology, that is, although there is a human body model, the force application characteristics of different people are different. There is only a static model and a lack of a dynamic model, so the customized seat may not be comfortable.

[0004] Therefore, a real-time human sitting posture detection device and a detection method are provided, which detect the human posture and force application situation through physical means. Summary of the Invention

[0005] In order to overcome the problems in the background art, the present invention provides a real-time human sitting posture detection device. A plurality of detection modules are arranged on the seat. The adjusting part on the detection module moves towards the sealed cavity under the action of a person. The movement of the person is real-time, and the adjusting part follows the person's movement, and this movement is also real-time. Calculate the real-time movement situation of the adjusting part. The real-time movement situations of all adjusting parts are the changes in the human sitting posture. The softness and hardness of the adjusting part can also be adjusted through an air pump, and the softness and hardness of different parts can also be different, which is applicable to a larger population.

[0006] In order to achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0007] A real-time human sitting posture detection device includes a detection seat, a computer, and a detection module. Multiple detection modules are arranged on the detection seat and grouped. Multiple detection modules form a group, and one group is set in one area. The computer centrally controls the entire group. The detection module includes a sealed cavity, an adjustment part, and a detection system. The adjustment part includes a top plane and a bracket. The top plane is installed on the bracket. An insertion hole is provided at the position of the sealed cavity corresponding to the bracket, and the bracket is installed in the insertion hole. A through hole is provided in the middle of the insertion hole of the sealed cavity. The detection device is installed on the sealed cavity. The detection device, the interactive display screen, and the computer are connected, and data is transmitted through a data transmission device.

[0008] Preferably, the detection device includes a connecting air pump, an air delivery pipeline, a compressible sealed sleeve, and an air flow sensor. The compressible sealed sleeve has a structure with openings at both the top and bottom. The compressible sealed sleeve is installed on the bracket. The bracket is inserted into the sleeve of the compressible sealed sleeve and then installed into the insertion hole. The top of the compressible sealed sleeve is fixed to the top plane, and the bottom is fixed to the sealed cavity. The air flow sensor is hermetically installed at the lower end of the through hole. The air flow sensor is connected to the computer. The air pump is installed outside the sealed cavity. The air delivery pipeline connects the air pump and the sealed cavity for gas exchange between the air pump and the sealed cavity. A barometric pressure detector is installed in the sealed cavity, and the internal air pressure is calculated by the barometric pressure detector.

[0009] Preferably, the detection device includes an air delivery pipeline, a compression plate, an adjustment rod, a sealed cavity, and a gas density meter. Below the through hole is the sealed cavity. The sealed cavity is connected to the upper and lower surfaces of the frame body. The sealed cavity is a column with equal cross-sections and is vertically through. The adjustment rod is installed on the lower surface of the top plane. The compression plate is installed at the front end of the adjustment rod. The shape of the compression plate corresponds to the internal cross-sectional shape of the sealed cavity. The compression plate is in seamless contact with the sealed cavity. The air pump is arranged in the sealed cavity. A connection hole is provided at the bottom of the sealed cavity. The air delivery pipeline is connected to the air pump through the connection hole. A cavity electromagnetic valve is provided on the connection hole. The gas density meter is installed at the bottom of the sealed cavity. The gas density meter transmits the real-time gas density change situation in the internal space formed by the sealed cavity and the compression plate to the computer. The computer calculates the displacement data of the adjustment part by calculating all the gas density values. The real-time change situation of the adjustment part is the dynamic change data of the human sitting posture. A temperature sensor is installed in the sealed cavity.

[0010] Preferably, a clamping structure is provided on the bracket. The clamping structure is located in the sealed cavity after the bracket is inserted into the sealed cavity to prevent the adjustment part from being directly pushed out.

[0011] Preferably, a hollow pipeline is provided below the insertion hole on the sealed cavity to restrict the bracket of the adjustment part and prevent the bracket from breaking due to improper sitting postures.

[0012] Preferably, a plurality of gas storage tanks are further provided outside the detection seat. The gas storage tanks are connected to an air pump through a tank pipeline. A tank electromagnetic valve is provided at the position where the gas storage tank is connected to the tank pipeline. Each gas storage tank contains different gases. The air pump is also directly connected to the outside through an air pipeline, and an air electromagnetic valve is also provided on the air pipeline.

[0013] A real-time human sitting posture detection method is applied to a real-time human sitting posture detection device, and includes the following steps:

[0014] Step 1: Turn on the device, and the air pump pressurizes the sealed cavity.

[0015] Step 2: Adjust the seat and start the driving simulation experiment.

[0016] Step 3: Calculate the real-time change of the adjusting block according to the output and perform three-dimensional fitting on the display screen.

[0017] Step 4: The experimenter analyzes the real-time sitting posture through three-dimensional fitting.

[0018] Preferably, in the process of calculating the real-time change of the adjusting part in Step 3, the change of the air flow is detected by an air flow sensor, and the air in the internal space of the adjusting part is converted into the change of the air volume in the internal space of the adjusting part. The relationship between the frequency of the air flow sensor and the flow velocity is:

[0019] F = St × V 速 / D (1)

[0020] In the formula: F is the vortex street generation frequency (Hz), V is the average flow velocity on both sides of the vortex generator (m / s), St is the Strouhal coefficient, and D is the width of the upstream surface of the vortex generator (m);

[0021] After obtaining the change amount of the air volume inside the adjusting part, let the height of the adjusting part relative to the sealed cavity be l0, the change amount of the height of the adjusting part be l, and the real-time height of the adjusting part be L;

[0022] The real-time height of the adjusting part is:

[0023] L = l0 - l (2)

[0024] The change amount of the height of the adjusting part is:

[0025]

[0026] Therefore, the calculation formula for the real-time height of the adjusting part is:

[0027]

[0028] After conversion, the final calculation formula for the real-time height of the adjusting part is:

[0029]

[0030] In formulas (2), (3), (4), and (5): L is the real-time height of the adjusting part, l0 is the maximum height of the adjusting part, l is the height change amount of the adjusting part, V is the volume change amount inside the adjusting part, K is the cross-sectional area of the annular structure, and s is the outer cross-sectional area of the adjusting part;

[0031] The calculation process of the softness of the detection module is as follows. The air pressure inside the sealed cavity is measured by a barometer. When the air pressure inside the sealed cavity, the atmospheric pressure, and the acting area are all known, the resultant force formed by two different air pressures can be calculated through the air pressure difference. The calculation formula for the acting force of the internal air pressure is:

[0032] F n = ρ n (s - K)(9)

[0033] The acting force of the external air pressure is:

[0034] F0 = ρ0s(10)

[0035] When the adjusting part in the seat cushion area is moving up and down and is affected by gravity, the acting force of the adjusting part at this time is:

[0036] F 合 = F n - G - F0 = ρ n (s - K) - mg - ρ0s(11)

[0037] When the adjusting part in the seat back area is moving back and forth and is not affected by gravity, the acting force of the adjusting part at this time is:

[0038] F 合 = F n - F0 = ρ n (s - K) - ρ0s(12)

[0039] In formulas (9), (10), (11), and (12): ρn is the internal air pressure, s is the outer cross-sectional area of the adjusting part, K is the cross-sectional area of the annular structure, ρ0 is the external atmospheric pressure, G is the gravity of the adjusting part, m is the mass of the adjusting part, and g is the acceleration due to gravity;

[0040] When a person leans on the seat, at this time the external air pressure does not do work. Therefore, the acting force on the person is the acting force of the internal air pressure and gravity on the adjusting part. The acting force in the backrest area is Fn, and the acting force in the seat cushion area is Fn - G. The softness of the detection module is reflected by the acting force on the person.

[0041] Preferably, the real-time change calculation process of the adjustment part in the third step is as follows: The gas density meter detects the change of gas density. The change in the volume of the internal space formed by the sealed cavity and the compression plate is proportional to the distance of the up and down movement of the adjustment part, which is a linear change. Its calculation formula is:

[0042] V = Sl (6)

[0043] In the formula, l is the real-time height of the internal space, and S is the cross-sectional area of the sealed cavity;

[0044] The calculation formula for density is:

[0045] ρ = M / v (7)

[0046] During the compression process, the total mass of the gas remains unchanged, and the volume changes. By measuring the change in gas density, the volume change is calculated, and then the distance l of the up and down movement of the adjustment part is measured based on the volume change. Let the maximum height of the adjustment part be l0 and the initial gas density be ρ0. Then the real-time height of the adjustment part is:

[0047]

[0048] In the formula: V is the change in the volume of the sealed cavity, S is the cross-sectional area of the sealed cavity, l is the real-time length of the internal space, l0 is the maximum height of the adjustment part, ρ is the gas density, ρ0 is the initial gas density, and M is the gas mass;

[0049] The detected gas density is converted into the internal air pressure. The conversion formula between gas density and air pressure is:

[0050] PM = nρRT (13)

[0051] n = M / M mol (14)

[0052] Substituting the latter formula into the former formula, we get:

[0053]

[0054] After simplification, we get

[0055]

[0056] In formulas (13), (14), (15), and (16), P is the air pressure, M is the gas mass, Mmol is the molar mass, R is the gas constant, and T is the temperature;

[0057] The air pressure is detected, and the acting area is known. By calculation, the detected air pressure is converted into the force on the adjustment part. The calculation formula for the internal air pressure acting force is:

[0058] F n = Pn s (17)

[0059] The external air pressure force is:

[0060] F0 = p 常 s 外 (18)

[0061] When the adjustment part in the seat cushion area is moving up and down and is affected by gravity, the force on the adjustment part at this time is:

[0062] F 合 = F n -G - F0 = p n s - m g -p 常 s 外 (19)

[0063] When the adjustment part in the seat back area moves back and forth and is not affected by gravity, the force on the adjustment part at this time is:

[0064] F 合 = F n -F0 = p n s - p 常 s 外 (20)

[0065] In formulas (17), (18), (19), and (20): Fn is the internal air pressure force, Pn is the internal air pressure, s is the internal cross-sectional area of the adjustment part, Souter is the outer cross-sectional area, F0 is the external air pressure force, Pconstant is the external atmospheric pressure, G is the gravity of the adjustment part, m is the mass of the adjustment part, g is the acceleration due to gravity, and Fresultant is the force on the adjustment part;

[0066] When a person leans on the seat, at this time the external air pressure does not do work, and the force on the person is the force on the adjustment part by the internal air pressure and gravity. In the seat back area, it is Fn, and in the seat cushion area, it is Fn - G. The softness of the detection module is detected through the force on the person.

[0067] Advantages of the present invention:

[0068] The present invention detects the human body posture by physical means through the detection module, can provide data such as sitting posture changes and force changes in real time, performs real-time detection on the detection seat through the adjustment part in cooperation with the air flow sensor and the gas density meter, calculates the force condition of the detection seat, and uses a computer for three-dimensional fitting to provide analysis data for simulation experiments and driving simulation experiments, improves the accuracy of seat force detection, improves the recognition rate of driving sitting postures, and adjusts the softness and hardness of different parts of the adjustment part through an air pump. The present invention can also be used in the field of customized seats to provide data such as dynamic sitting postures and force conditions when customizing seats. Description of the Drawings

[0069] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention;

[0070] Figure 2 It is a schematic diagram of the sealed cavity of the present invention;

[0071] Figure 3 It is a sectional view of the first embodiment of the present invention;

[0072] Figure 4 It is a schematic structural diagram of the adjustment part of the first embodiment of the present invention;

[0073] Figure 5 It is a schematic diagram of the compressible sealed sleeve of the first embodiment of the present invention;

[0074] Figure 6 It is a schematic diagram of the detection seat of the present invention;

[0075] Figure 7 It is a schematic structural diagram of the second embodiment of the present invention;

[0076] Figure 8 It is a schematic structural diagram of the sealed cavity of the present invention;

[0077] Figure 9 It is a schematic structural diagram of the adjustment part of the second embodiment of the present invention;

[0078] Figure 10 It is a connection diagram of the detection system of the present invention;

[0079] Figure 11 It is a detection flow chart of the present invention.

[0080] In the figure, the reference numerals are: 1 - detection seat; 2 - computer; 3 - interactive display screen; 4 - detection module; 5 - sealed cavity; 501 - insertion hole; 502 - through hole; 6 - air pump; 7 - air delivery pipeline; 8 - adjustment part; 801 - top plane; 802 - bracket; 803 - clamping structure; 804 - adjustment rod; 805 - compression plate; 9 - compressible sealed sleeve; 10 - air flow sensor; 11 - gas storage tank; 12 - tank pipeline; 13 - air pipeline; 14 - hollow pipeline; 15 - air pressure detector; 16 - sealed cavity; 161 - connection hole; 162 - limiting part; 17 - gas density meter; 18 - temperature sensor. Specific Embodiments

[0081] In order to make the objectives, technical solutions and beneficial effects of the present invention clearer, the following will, with reference to the accompanying drawings, provide a detailed description of the preferred embodiments of the present invention for the convenience of those skilled in the art to understand.

[0082] Embodiment 1

[0083] As Figures 1-6As shown in the figure, a real-time human sitting posture detection device includes a detection seat 1, a computer 2, and an interactive display screen 3. The detection seat 1 is in the shape of a car seat, and is provided with a plurality of detection modules 4 on it. The outside of the detection seat 1 is wrapped with a skin, which covers all internal structures including the detection modules 4, and the skin is detachable. The detection modules 4 are grouped, and each detection module 4 is independently controlled. A plurality of detection modules 4 form a group and are numbered. One group number is set for the detection modules 4 in one area, and the computer 2 centrally controls the entire group. The group can be changed according to actual needs to avoid problems such as low efficiency caused by individual detection module 4 control. The detection module 4 is composed of: a sealed cavity 5, an air pump 6, an air delivery pipe 7, an adjustment part 8, a compressible sealed sleeve 9, and an air flow sensor 10.

[0084] The adjustment part 8 is a rigid structure, including a top plane 801 and a bracket 802 perpendicular to the top plane 801. The sealed cavity 5 is provided with an insertion hole 501 corresponding to the position of the bracket 802 of the adjustment part 8. The bracket 802 can be inserted into the insertion hole 501 of the sealed cavity 5, and the bracket 802 can slide straight up and down in the insertion hole 501 and is in seamless sliding contact with the insertion hole 501 to ensure that air cannot pass through this contact position and ensure airtightness. A clamping structure 803 is provided on the bracket 802. The clamping structure is located inside the sealed cavity 5 where the bracket 802 is inserted. When the internal air pressure in the sealed cavity 5 is relatively high, it prevents the adjustment part 8 from being directly pushed out. The sealed cavity 5 is provided with a hollow pipe 14 below the insertion port, that is, after the bracket 802 is inserted into the insertion hole 501, it enters the hollow pipe 14. The setting of the hollow pipe plays a role in restricting the movement of the adjustment part 8 and can also prevent the bracket 802 from breaking due to improper sitting postures. The edge of the top plane 801 of the adjustment part 8 is chamfered and has an arc transition, so as not to prick the human body and not damage the skin during human use.

[0085] The compressible sealed sleeve 9 is a structure with upper and lower openings. Four corners of the compressible sealed sleeve 9 are provided with cylindrical sleeves corresponding to the brackets 802, and a compressible material is connected between adjacent cylindrical sleeves. The bracket 802 is inserted into the cylindrical sleeve and then inserted into the sealed cavity 5 through the insertion hole 501. The top of the compressible sealed sleeve 9 is fixed to the top plane 801 of the adjustment part 8, and the bottom of the compressible sealed sleeve 9 is fixed to the sealed cavity 5. After being fixed, the compressible sealed sleeve 9 can be folded or compressed correspondingly with the movement of the adjustment part 8. The internal space of the whole formed by the three structures of the adjustment part 8, the compressible sealed sleeve 9, and the sealed cavity 5 is airtight.

[0086] A through hole 502 is provided in the middle of the insertion hole 501 on the sealed cavity 5. The internal space formed by the adjusting part 8 and the compressible sealing sleeve 9 exchanges gas only through the through hole 502 and the internal space of the sealed cavity 5. The gas moves only within the overall space formed by these three structures and cannot exchange gas with the outside through these three structures. The air flow sensor 10 is installed at the lower end of the through hole 502 for detecting the gas flow rate in the through hole 502. The air pump 6 is installed outside the sealed cavity 5, and the air delivery pipe 7 connects the air pump 6 and the sealed cavity 5 for gas exchange between the air pump 6 and the sealed cavity 5. By using the air pump 6 to discharge the internal gas to the outside or inhale the external gas into the internal space, the gas density, i.e., air pressure, in the internal space of the overall structure composed of the adjusting part 8, the compressible sealing sleeve 9, and the sealed cavity 5 is changed. When the gas density is relatively high, the adjusting part 8 is not easily moved towards the sealed cavity 5, and the resistance received at this time is relatively large; when the gas density is relatively low, the adjusting part 8 is relatively easily moved towards the sealed cavity 5, and the resistance received at this time is relatively small. The user can change the gas density inside the sealed cavity 5 through the interactive display screen 3, that is, detect the softness and hardness of the seat 1.

[0087] When the device is in use, a person sits on the detection seat 1, and the detection seat 1 wraps the human body. The force exerted by the person on the detection seat 1 will press the adjusting part 8, causing the adjusting part 8 to move towards the sealed cavity 5. Since the internal space of the overall structure composed of the adjusting part 8, the compressible sealing sleeve 9, and the sealed cavity 5 is sealed, the gas in the adjusting part 8 enters the inside of the sealed cavity 5 through the through hole 502. The overall of the adjusting part 8 and the compressible sealing sleeve 9 is a hollow cuboid structure, and the bottom area is the area of the top plane 801 of the adjusting part 8, which is fixed. By detecting the gas flow rate through the through hole 502 with the air flow sensor 10, the reduction amount of the internal space volume of the overall of the adjusting part 8 and the compressible sealing sleeve 9 can be calculated. Since the adjusting part 8 is a rigid structure and the compression change of the compressible sealing sleeve 9 is also linear, the reduction amount of the internal space volume of the overall of the adjusting part 8 and the compressible sealing sleeve 9 is also linear. By the reduction amount and the known cross-sectional area, the descending height of the adjusting part 8 can be known, that is, the change situation of the adjusting part 8 after being stressed when the user is using it. And the change of the air flow rate is real-time, and the change of the adjusting part 8 is also real-time. The air flow sensor 10 transmits the real-time change situation of the air flow rate to the computer 2, and the computer 2 can know all the data detected by all the air flow sensors 10 through calculation, that is, all the change situations of all the adjusting parts 8. The real-time change situations of all the adjusting parts 8 are the change situations of the human body's dynamic sitting posture.

[0088] A real-time human sitting posture detection method is applied to a real-time human sitting posture detection device, including the following steps:

[0089] Step 1: Turn on the device, and the air pump pressurizes the sealed cavity;

[0090] Step 2: The tester sits on the detection seat, feels the softness and hardness of the seat, adjusts the seat according to the feedback of the test subject. After the seat adjustment is completed, start the driving simulation experiment, and the tester controls the simulated vehicle to drive;

[0091] Step 3: Calculate the real-time change of the adjustment block according to the output and perform three-dimensional fitting on the display screen;

[0092] Step 4: The experimenter analyzes the real-time sitting posture through three-dimensional fitting.

[0093] For a real-time human sitting posture detection device according to Embodiment 1, the specific calculation process of Step 3 is as follows:

[0094] The air flow sensor selects a stress type vortex street flowmeter. The stress type vortex street flowmeter consists of a vortex generator, a detection probe and corresponding electronic circuits, etc. When the fluid flows through the vortex generator, two rows of alternating Karman vortices are formed on both sides of it. These alternating vortices form a series of alternating fluid lift forces. This lift force acts on the detection probe based on the piezoelectric effect, generating a series of alternating charge signals. After being converted, shaped and amplified by the preamplifier, a pulse signal with the same frequency as the vortex shedding frequency and proportional to the flow velocity is output. The relationship between the frequency and the flow velocity is:

[0095] F = St×V 速 / D (1)

[0096] In the formula: F is the vortex street generation frequency (Hz), V is the average flow velocity on both sides of the vortex generator (m / s), St is the Strouhal coefficient, and D is the width of the vortex generator's upstream-facing surface (m);

[0097] The air flow sensor detects the change in air flow. The internal space formed by the adjustment part and the compressible sealed sleeve only contains air. The overall structure formed by the adjustment part and the compressible sealed sleeve is only planar at the top and annular at other parts. The cross-sectional area of this annular structure is set as K, and each adjustment part is the same. Therefore, the change in the air in the internal space can be converted into a change in volume; in the non-working or starting working condition, since the air pressure inside the sealed cavity is greater than the outside, the adjustment part is pushed to the outermost part, that is, the clamping structure on the adjustment part contacts the sealed cavity. At this time, the height of the adjustment part relative to the sealed cavity is set as l0, the change amount of the adjustment part height is set as l, and the real-time height of the adjustment part is set as L. The real-time height of the adjustment part is:

[0098] L = l0 - l (2)

[0099] The change amount of the adjustment part height is:

[0100]

[0101] Therefore, the formula for the real-time height of the adjustment part is:

[0102]

[0103] After conversion, the final formula for the real-time height of the adjustment part is:

[0104]

[0105] In the formula: L is the real-time height of the adjustment part, l0 is the maximum height of the adjustment part, l is the height change amount of the adjustment part, V is the volume change amount inside the adjustment part, K is the cross-sectional area of the ring structure, and s is the outer cross-sectional area of the adjustment part.

[0106] Install a barometric pressure detector in the sealed cavity. Before using the device, adjust the air pressure in the sealed cavity. When in use, no external gas enters. When a person uses the device, a force is applied to the adjustment part, which causes the adjustment part to move towards the sealed cavity. The moving distance of the adjustment part can be calculated. At this time, the external air pressure is the atmospheric pressure, and the internal air pressure is measured by the barometric pressure detector. Both the two air pressures and the acting areas are known. The resultant force formed by the two different air pressures can be calculated through the air pressure difference. The formula for the acting force of the internal air pressure is:

[0107] F n =ρ n (s - K)(9)

[0108] The acting force of the external air pressure is:

[0109] F0 = ρ0s(10)

[0110] When detecting the adjustment part in the seat cushion area, it moves up and down and is affected by gravity. Therefore, the acting force of the adjustment part at this time is:

[0111] F 合 =F n - G - F0 = ρ n (s - K)- mg - ρ0s(11)

[0112] When detecting the adjustment part in the seat backrest area, it moves back and forth and is not affected by gravity. Therefore, the acting force of the adjustment part at this time is:

[0113] F 合 =F n - F0 = ρ n (s - K)- ρ0s(12)

[0114] When the human body leans on the detection seat, the external air pressure does no work at this time. Therefore, the force exerted on the human body is the force exerted on the adjustment part by the internal air pressure and gravity. The force on the backrest area is Fn, and the force on the seat cushion area is Fn - G.

[0115] In the formula: Fn is the internal air pressure force, ρn is the internal air pressure, s is the outer cross-sectional area of the adjustment part, K is the cross-sectional area of the ring structure, ρ0 is the external atmospheric pressure, G is the gravity of the adjustment part, m is the mass of the adjustment part, g is the acceleration due to gravity, and F combined is the force on the adjustment part.

[0116] Embodiment 2

[0117] As Figures 6-9 shown, the detection seat 1 is in the shape of a car seat, and multiple detection modules 4 are arranged on it. The outside of the detection seat 1 is wrapped with a layer of skin, and the skin covers all internal structures including the detection module 4, and the skin is detachable; the detection modules 4 are grouped, and each detection module 4 is independently controlled. Multiple detection modules 4 form a group and are numbered. One group number is set for the detection modules 4 in one area. The entire group is centrally controlled by a computer 2, and the group can be changed according to actual needs to avoid problems such as low efficiency caused by the control of a single detection module 4; the detection module 4 consists of: a sealed cavity 5, an air pump 6, an air delivery pipeline 7, an adjustment part 8, a sealed cavity 16, a gas density meter 17, and a temperature sensor 18.

[0118] The adjusting part 8 is of a rigid structure and consists of a top plane 801, a bracket 802 perpendicular to the top plane, and an adjusting rod 803. An insertion hole 501 is provided at the position of the bracket corresponding to the sealed cavity 5. The bracket 802 on the adjusting part 8 can be inserted into the insertion hole 501, and the bracket 802 can slide straight up and down in the insertion hole 501. A through hole 502 is provided in the middle of the insertion hole 501 of the sealed cavity 5, and the position where the through hole 502 is provided corresponds to the adjusting rod 804. Below the through hole 502 is a sealed cavity 16. The sealed cavity 16 connects the upper and lower surfaces of the sealed cavity 5. The sealed cavity 16 is perpendicular to the upper and lower surfaces of the sealed cavity 5. The sealed cavity 16 is a column with equal cross-sections, and the shape of its inner cross-section is the same as the shape of the through hole, and it penetrates up and down. The lower part is fixed to the sealed cavity 5, and the upper part is connected to the position of the through hole 502. The lower part of the sealed cavity 16 is sealed by the sealed cavity 5, and the upper part can exchange gas with the outside through the through hole 502. The shape of the compression plate 805 corresponds to the shape of the inner cross-section of the sealed cavity 16. The adjusting rod 804 is inserted into the sealed cavity 16 through the through hole 502. The adjusting rod 804 can move straight up and down in the sealed cavity 16. The compression plate 805 of the adjusting rod 804 is in seamless contact with the sealed cavity 16, and it is airtight at the contact position. The internal space formed by the sealed cavity 16 and the compression plate 805 is sealed. The volume of this internal space changes with the movement of the compression plate 805, but it always remains sealed. The air pump 6 is arranged in the sealed cavity 5. A connection hole 161 is provided at the bottom of the sealed cavity 16. The sealed cavity 16 is connected to the air pump 6 through an air delivery pipe 7 at the position of the connection hole 161 for gas exchange between the air pump 6 and the sealed cavity 16. A cavity electromagnetic valve is arranged on the connection hole 161 to control the entry and exit of gas. The position where the air delivery pipe 7 is connected to the sealed cavity 16 is located at the lower part of the sealed cavity 16. A gas density meter is arranged in the sealed cavity 16, also at the lower part of the sealed cavity 16. By exhausting the internal gas outward or inhaling external gas into the internal space through the air pump 6, the gas density, that is, the air pressure, in the internal space formed by the adjusting part 8 and the compression plate 805 is changed. When the gas density is high, it is not easy for the adjusting part 8 to move towards the sealed cavity 5, and at this time, the resistance received is large; when the gas density is low, the adjusting part is relatively easy to move towards the sealed cavity 5, and at this time, the resistance received is small. The user can change the initial gas density inside the sealed cavity 16 through the interactive display screen 3, that is, detect the softness and hardness of the seat 1.

[0119] When the device is in use, a person sits on the detection seat 1. The detection seat 1 wraps around the human body, and the person exerts a force on the detection seat 1. The force exerted by the person on the detection seat 1 will press down on the adjustment part 8, causing the adjustment part 8 to move towards the sealed cavity 5. The adjustment rod 804 on the adjustment part 8 also follows the adjustment part 8 and moves towards the sealed cavity 5. Since the internal space formed by the sealed cavity 16 and the compression plate 805 on the adjustment rod 804 is airtight, when the adjustment rod 804 moves towards the sealed cavity 5, it also compresses the air in the internal space formed by the sealed cavity 16 and the compression plate 805 on the adjustment rod 804. This internal space is airtight, so the total amount of air remains fixed. The sealed cavity 16 is a cylinder with the same cross-sectional area, so the change in gas density after compression is also linear. By knowing the change in the gas, the change in the internal space can be determined. The cross-sectional area is fixed and known. According to the change in the internal space, the specific change in the up and down movement of the adjustment rod 804, that is, the change in the up and down movement of the adjustment part 8, can be determined. The gas density meter 17 transmits the real-time gas density change in the internal space formed by the sealed cavity 16 and the compression plate on the adjustment rod 804 to the computer 2. The computer 2 can calculate and obtain the data detected by all gas density meters through calculation, that is, the change in all adjustment parts. The real-time change in all adjustment parts 8 is the dynamic change in the human sitting posture.

[0120] A real-time human sitting posture detection method, applied to a real-time human sitting posture detection device, includes the following steps:

[0121] Step 1: Turn on the device, and the air pump pressurizes the sealed cavity.

[0122] Step 2: The tester sits on the detection seat and feels the softness and hardness of the seat. According to the feedback of the test subject, adjust the seat. After the seat adjustment is completed, start the driving simulation experiment, and the tester controls the simulated vehicle to drive.

[0123] Step 3: Calculate the real-time change of the adjustment block according to the output and perform three-dimensional fitting on the display screen.

[0124] Step 4: The experimenter analyzes the real-time sitting posture through three-dimensional fitting.

[0125] According to a real-time human sitting posture detection device described in Embodiment 1, the specific calculation process of Step 3 is as follows: The gas density meter detects the change in gas density, and the internal space formed by the sealed cavity and the compression plate only contains air. Since the sealed cavity is a cylinder with equal cross-sectional area, the change in the volume of the internal space formed by the sealed cavity and the compression plate is proportional to the distance of the up and down movement of the adjustment part, showing a linear change. Its calculation formula is:

[0126] V = Sl (6)

[0127] Where l is the real-time height of the internal space, and s is the cross-sectional area of the sealed cavity;

[0128] The calculation formula for density is:

[0129] ρ = M / v (7)

[0130] The internal space is sealed. Before compression, the air pump conveys gas to the sealed space. At this time, without compression, the volume remains unchanged, and the gas mass increases or decreases. The gas mass can be calculated through the change in density. During the compression process, the total gas mass remains unchanged, and the volume changes. Therefore, the change in volume can be known by measuring the change in gas density. The sealed cavity is a cylinder with an equal cross-section. Then, according to the change in volume, the distance l that the adjustment part moves up and down can be measured. Let the highest height of the adjustment part, that is, the original height, be l0, and the initial gas density be ρ0. Then the real-time height of the adjustment part is:

[0131]

[0132] Where: V is the change in volume of the sealed cavity, S is the cross-sectional area of the sealed cavity, l is the real-time length of the internal space, l0 is the highest height of the adjustment part, ρ is the gas density, ρ0 is the initial gas density (the gas density after the air pump adjustment), and M is the gas mass.

[0133] A temperature sensor 18 is also provided in the sealed cavity; during operation, no external gas enters. When a person uses the device, a force will be applied to the adjustment part, which will cause the adjustment part to move towards the frame body. The movement distance of the adjustment part can be calculated. At this time, the external air pressure is the atmospheric pressure, the gas density is detected by a gas density meter, and the temperature is detected by a temperature sensor. The detected gas density can be converted into the internal air pressure. The conversion formula between gas density and air pressure is:

[0134] PM = nρRT (13)

[0135] n = M / M mol (14)

[0136] Substituting the latter formula into the former formula, we get:

[0137]

[0138] After simplification, we get

[0139]

[0140] In formulas (13), (14), (15), and (16), P is the air pressure, M is the gas mass, Mmol is the molar mass, R is the gas constant, and T is the temperature;

[0141] After the air pressure is detected and the acting area is known, the detected air pressure intensity can be converted into the force on the adjusting part through calculation. The calculation formula for the internal air pressure acting force is:

[0142] F n =p n s (17)

[0143] The external air pressure acting force is:

[0144] F0=p 常 s 外 (18)

[0145] When the adjusting part in the seat cushion area is moving up and down, it will be affected by gravity. Therefore, the acting force of the adjusting part at this time is:

[0146] F 合 =F n -G-F0=p n s-mg-p 常 s 外 (19)

[0147] When the adjusting part in the seat back area is moving back and forth, it is not affected by gravity. Therefore, the acting force of the adjusting part at this time is:

[0148] F 合 =F n -F0=p n s-p 常 s 外 (20)

[0149] When a person leans on the seat, the external air pressure does not do work at this time. Therefore, the force received by the person is the acting force of the internal air pressure and gravity on the adjusting part. In the seat back area, it is Fn, and in the seat cushion area, it is Fn - G. In the formula: Fn is the internal air pressure acting force, Pn is the internal air pressure, s is the internal cross-sectional area of the adjusting part (the internal contact top surface area), Souter is the outer cross-sectional area (the top plane area), F0 is the external air pressure acting force, and Patm is the external air pressure (atmospheric pressure).

[0150] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any change or replacement that can be thought of without creative work should be covered within the protection scope of the present invention.

Claims

1. A detection device for real-time human sitting postures, characterized in that, Including: A detection seat (1), a computer (2), and a detection module (4); The detection module (4) is arranged on the detection seat (1). The detection modules (4) are grouped, with one group set in one area, and 2 to 8 detection modules (4) in a group. The computer (2) centrally controls the entire group. The detection module (4) includes a sealed cavity (5), an adjustment part (8), and a detection system. The adjustment part (8) includes a top plane (801) and a bracket (802). The top plane (801) is installed on the bracket (802). An insertion hole (501) is provided at the position of the sealed cavity (5) corresponding to the bracket (802). The bracket (802) is installed in the insertion hole (501). A through hole (502) is provided in the middle of the insertion hole (501) of the sealed cavity (5). The detection system is installed on the sealed cavity (5). The detection system and the interactive display screen (3) are connected to the computer (2); The detection system includes: an air delivery pipeline (7), an adjustment rod (804), a compression plate (805), a sealed cavity (16), and a gas density meter (17). Below the through hole is the sealed cavity (16). The sealed cavity (16) is connected to the upper and lower surfaces of the sealed cavity (5). The sealed cavity (16) is a column with equal cross-sections and is vertically through. The adjustment rod (804) is installed on the lower surface of the top plane (801). The compression plate (805) is installed at the front end of the adjustment rod (804). The shape of the compression plate (805) corresponds to the internal cross-sectional shape of the sealed cavity (16). The compression plate (805) is in seamless contact with the sealed cavity (16). An air pump (6) is arranged in the sealed cavity (5). A connection hole (161) is provided at the bottom of the sealed cavity (16). The air delivery pipeline (7) is connected to the air pump (6) through the connection hole (161). A cavity electromagnetic valve is arranged on the connection hole (161). The gas density meter (17) is installed at the bottom of the sealed cavity (16). The gas density meter (17) transmits the real-time gas density change situation in the internal space formed by the sealed cavity (16) and the compression plate (805) to the computer (2). The computer (2) obtains the displacement data of the adjustment part (8) by calculating the values of all gas density meters (17). The real-time change situation of the adjustment part (8) is the dynamic change data of the human sitting posture.

2. The detection device for real-time human sitting postures according to claim 1, characterized in that Also including: A temperature sensor (18); The temperature sensor (18) is installed in the sealed cavity (16).

3. The detection device for real-time human sitting posture according to claim 1, characterized in that: A clamping structure (803) is provided at the front end of the bracket (802). The clamping structure (803) and the bracket (802) are inserted into the sealed cavity (5) together to prevent the adjustment part (8) from popping out after compression and rebound.

4. The detection device for real-time human sitting posture according to claim 1, characterized in that: A hollow pipeline (14) is provided below the insertion hole (501) on the sealed cavity (5). The hollow pipeline (14) restricts the bracket (802) of the adjustment part to prevent the bracket from breaking due to improper sitting postures.

5. The detection device for real-time human sitting posture according to claim 1, characterized in that: An air storage tank (11) is further provided outside the detection seat (1). The air storage tank (11) is connected to the air pump (6) through a tank pipeline (12). A tank electromagnetic valve is provided at the connection position of the air storage tank (11) and the tank pipeline (12). Each air storage tank (11) contains different gases, and the air pump (6) is also directly connected to the outside through an air pipeline (13).

6. A real-time human sitting posture detection method, applied to the real-time human sitting posture detection device according to any one of claims 1-5, characterized in that, It includes the following steps: Step 1: Turn on the device, and the air pump pressurizes the sealed cavity; Step 2: Adjust the seat and start the driving simulation experiment; Step 3: Calculate the real-time change of the adjustment part according to the output and perform three-dimensional fitting on the computer; Specifically, the calculation process of the real-time change of the adjustment part is as follows: The gas density meter detects the change of gas density. The change of the volume of the internal space formed by the sealed cavity and the compression plate is proportional to the distance of the up and down movement of the adjustment part and is a linear change. Its calculation formula is: V1 = S·l1 (6) In the formula, l1 is the real-time height of the internal space, and S is the cross-sectional area of the sealed cavity; The calculation formula of gas density is: ρ = M / v (7) During the compression process, the total mass of the gas remains unchanged and the volume changes. By measuring the change of gas density, the volume change is calculated, and then the change amount of the height of the adjustment part is measured according to the change of volume. Let the maximum height of the adjustment part be l0 and the initial gas density be ρ0. Then the real-time height of the adjustment part is: In the formula: V1 is the change amount of the volume of the sealed cavity, S is the cross-sectional area of the sealed cavity, l1 is the real-time height of the internal space, l0 is the maximum height of the adjustment part, ρ is the gas density, ρ0 is the initial gas density, and M is the gas mass; Step 4: The experimenter analyzes the real-time sitting posture through three-dimensional fitting.

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