Seat cushion, fatigue driving monitoring system and vehicle seat

Abstract

The embodiment of the utility model relates to a seat cushion, a fatigue driving monitoring system and a vehicle seat. The seat cushion comprises a physiological detection cushion body and a pressure detection cushion body which are stacked in the thickness direction of the seat cushion. The pressure detection pad body comprises M first conductive wires arranged at intervals along a first direction and N second conductive wires arranged at intervals along a second direction, and the M first conductive wires and the N second conductive wires are mutually crossed to form M * N sensing point positions; the physiological detection pad body comprises a plurality of piezoelectric film sensors; projection is carried out in the thickness direction of the seat cushion, any one piezoelectric film sensor is staggered from any one first electric lead, and any one piezoelectric film sensor is staggered from any one second electric lead. The seat cushion provided by the utility model integrates the pressure detection cushion body and the physiological detection cushion body, so that the seat cushion has the functions of pressure detection and physiological detection, and the pressure detection and the physiological detection can be combined in application so as to improve the monitoring precision of vital sign data.

Description

Technical Field

[0001] This utility model relates to the field of seat cushion technology, and in particular to a seat cushion, a driver fatigue monitoring system, and a vehicle seat. Background Technology

[0002] In existing technology, vehicle seat cushions are typically equipped with pressure sensing pads. These pads determine the pressure applied to their surface by detecting changes in capacitance or resistance at several points, thereby analyzing changes in the user's posture and allowing the user to adjust their sitting, standing, or lying position accordingly. When a specific area of ​​the pressure sensing pad is subjected to pressure, a significant change in electrical signal is generated at that point, thus enabling pressure detection.

[0003] In addition, existing technologies can also include physiological detection pads on vehicle seats to detect the vital signs of occupants and monitor their health. Existing technologies can also include heating pads on vehicle seats to heat the seats and improve the driving and riding experience.

[0004] However, in existing technologies, pressure sensing pads, physiological sensing pads, and heating pads are usually installed independently. When they need to be assembled on a seat simultaneously, installation and fixation are inconvenient, space-consuming, and prone to slippage, thus affecting their individual working accuracy. Furthermore, in intelligent monitoring and feedback, the detection data from the independently installed pressure sensing pads and physiological sensing pads are processed separately, achieving only single pressure and physiological detection functions. The corresponding detection accuracy is limited by the performance of the pads themselves. Utility Model Content

[0005] In view of the above problems, the present invention provides a seat cushion, a driver fatigue monitoring system, and a vehicle seat, which overcomes or at least partially solves the above problems.

[0006] According to one aspect of the present invention, a seat cushion is provided, comprising a physiological detection pad and a pressure detection pad stacked in the thickness direction of the seat cushion; the pressure detection pad includes M first conductive lines spaced apart along a first direction and N second conductive lines spaced apart along a second direction, the M first conductive lines and the N second conductive lines intersecting each other to form M×N sensing points; the physiological detection pad includes a plurality of piezoelectric thin film sensors; projected along the thickness direction of the seat cushion, any one of the piezoelectric thin film sensors is offset from any one of the first conductive lines, and any one of the piezoelectric thin film sensors is offset from any one of the second conductive lines.

[0007] In one alternative embodiment, the pressure sensing pad includes a first fabric layer, a conductive layer, and a second fabric layer stacked sequentially, wherein the first conductive wire is disposed on one side of the first fabric layer facing the conductive layer, and the second conductive wire is disposed on one side of the second fabric layer facing the conductive layer.

[0008] In an alternative embodiment, the pressure sensing pad further includes an insulating layer that surrounds the conductive layer and is stacked between the first fabric layer and the second fabric layer.

[0009] In an alternative embodiment, the pressure sensing pad further includes a first protective layer disposed on the side of the first fabric layer away from the conductive layer.

[0010] And / or, a second protective layer, which is disposed on the side of the second fabric layer away from the conductive layer.

[0011] In one alternative, the physiological detection pad is fixedly attached to the pressure detection pad by weaving or adhesive.

[0012] In one alternative embodiment, the seat cushion further includes a heating pad, wherein the physiological detection pad, the pressure detection pad, and the heating pad are stacked in sequence, and the heating pad covers the pressure detection pad.

[0013] In one alternative embodiment, the heating pad body is provided with a heating resistance wire.

[0014] In one alternative, the heating pad is fixedly attached to the pressure sensing pad by weaving or adhesive.

[0015] According to one aspect of the present invention, a vehicle seat is provided, the vehicle seat including the aforementioned seat cushion.

[0016] According to one aspect of the present invention, a fatigue driving monitoring system is provided, including the aforementioned seat cushion and controller; the controller includes a function for receiving sensing data from the M×N sensing points, and the controller also includes a function for receiving piezoelectric data from the piezoelectric thin film sensor.

[0017] The beneficial effects of this utility model embodiment include: providing a seat cushion comprising a physiological detection pad and a pressure detection pad stacked in the thickness direction of the seat cushion; the pressure detection pad includes M first conductive lines spaced apart along a first direction and N second conductive lines spaced apart along a second direction, the M first conductive lines and N second conductive lines intersecting to form M×N sensing points; the physiological detection pad includes a plurality of piezoelectric thin film sensors; projected along the thickness direction of the seat cushion, any piezoelectric thin film sensor is offset from any first conductive line, and any piezoelectric thin film sensor is offset from any second conductive line. With this seat cushion, not only can sensing data be provided through the M×N sensing points for pressure detection, but piezoelectric data can also be provided through the piezoelectric thin film sensors for physiological detection, expanding the application scenarios of the seat cushion.

[0018] In addition, since the pressure detection pad and the physiological detection pad are stacked and integrated, it is not necessary to install the pressure detection pad and the physiological detection pad separately when installing the seat cushion. This allows for the installation of a pad with both pressure detection and physiological detection functions, making assembly convenient, efficient, and stable, and improving the ease of installation and reliability of the seat cushion.

[0019] At the same time, because the pressure detection pad and the physiological detection pad are stacked and integrated, the seat cushion forms a compact whole, thus occupying less installation space and improving space utilization.

[0020] In addition, by integrating the physiological detection pad and the pressure detection pad, when performing intelligent feedback calculations, the sensor data provided by the M×N sensing points of the pressure detection pad and the piezoelectric data provided by the piezoelectric thin film sensor of the physiological detection pad can be combined simultaneously, thereby providing high-precision physiological monitoring information and improving the accuracy of intelligent feedback regulation.

[0021] In addition, the seat cushion can integrate a heating pad, which provides a warm riding environment for the user. Furthermore, when installing the seat cushion, there is no need to install the heating pad, pressure sensing pad, and physiological sensing pad separately, improving the ease and reliability of installation. The seat cushion also occupies little installation space, increasing space utilization. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0023] Figure 1 This is a three-dimensional structural diagram of the seat cushion provided in this embodiment of the utility model;

[0024] Figure 2This is an exploded view of the seat cushion provided in this embodiment of the utility model;

[0025] Figure 3 yes Figure 1 Enlarged diagram of section A in the middle;

[0026] Figure 4 This is a perspective structural diagram of the seat cushion provided in an embodiment of the present utility model. Detailed Implementation

[0027] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and similar expressions used in this specification are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0029] Please refer to the seat cushion 100 provided in this embodiment of the utility model. Figure 1 , Figure 2 and Figure 3 The seat cushion 100 includes a physiological detection pad 20 and a pressure detection pad 10 stacked in the thickness direction.

[0030] To facilitate reader understanding and description, we define the first direction D1, the second direction D2, and the third direction D3. The third direction D3 is perpendicular to the first direction D1 and the second direction D2, respectively. The direction in which the physiological detection pad 20 and the pressure detection pad 10 are stacked in sequence is the third direction D3, which is also the thickness direction of the seat cushion 100.

[0031] It is worth noting that the first direction D1 and the second direction D2 can be set perpendicularly, or the first direction D1 and the second direction D2 can be set at an angle to each other.

[0032] Please refer to the following: Figures 2 to 4The pressure sensing pad 10 includes M first conductive lines 11 spaced apart along a first direction D1 and N second conductive lines 21 spaced apart along a second direction D2. The M first conductive lines 11 and N second conductive lines 21 intersect to form M×N sensing points. The physiological sensing pad 20 includes a plurality of piezoelectric thin film sensors 201. Projected along the thickness direction D3 of the seat cushion 100, each piezoelectric thin film sensor 201 is offset from any first conductive line 11 and any second conductive line 21. That is, each piezoelectric thin film sensor 201, when projected along the thickness direction of the seat cushion 100, is located within a blank area of ​​the pressure sensing pad 10. These blank areas are specifically the blank grid areas formed by the intersection of the M first conductive lines 11 and the N second conductive lines 21. This arrangement ensures that the pressure sensing pad 10 and the physiological sensing pad 20 do not interfere with each other functionally. The pressure sensing pad 10 is responsible for detecting pressure-related sensor data, while the physiological sensing pad 20 focuses on detecting the user's piezoelectric data, such as physiological signals (heart rate, respiratory rate, etc.). Because the piezoelectric film sensors 201 are located within the blank grid area of ​​the pressure sensing pad 10, they are not affected by interference from the first conductive line 11 and the second conductive line 21, thus enabling accurate collection of the user's physiological data. Furthermore, this design allows the signal processing circuits of the pressure sensing pad 10 and the physiological sensing pad 20 to operate independently, reducing crosstalk between signals and improving stability and data accuracy.

[0033] Specifically, the stacking of the physiological detection pad 20 and the pressure detection pad 10 can be such that the pressure detection pad 10 is stacked on top of the physiological detection pad 20, or the physiological detection pad 20 is stacked on top of the pressure detection pad 10. Preferably, the pressure detection pad 10 is stacked and covers the physiological detection pad 20, so that when the seat cushion 100 is in use, the pressure detection pad 10 is closer to the seater than the physiological detection pad 20.

[0034] The physiological detection pad 20 is used to detect the physiological functions of the occupant acting on the seat cushion 100, such as heart rate and respiratory rate; the pressure detection pad 10 is used to provide pressure sensing data when the occupant acts on the seat cushion 100; the physiological detection pad 20 and the pressure detection pad 10 in the seat cushion 100 can work together to improve the usability and comfort of the seat cushion 100.

[0035] It is worth noting that M is an integer not less than 1, and N is an integer not less than 1.

[0036] It is worth noting that, through the physiological detection cushion 20, when the occupant applies pressure to the seat cushion 100, the piezoelectric thin film sensor 201 can generate a piezoelectric effect and provide piezoelectric data. Thus, by sensing the tiny vibrations caused by the heartbeat, the heart rate and respiratory rate can be monitored, and the activity status of the heart can be reflected in real time and accurately.

[0037] Furthermore, since there is a close relationship between heart rate or respiratory rate and fatigued driving, this relationship can be reflected by changes in heart rate or respiratory rate. When a driver is in a normal driving state, their heart rate or respiratory rate remains within a relatively stable range. When a driver is fatigued, their heart rate or respiratory rate changes. Specifically, due to driving fatigue, the driver's heart rate slows down. Driving with a heart rate less than 20% below the standard value constitutes fatigued driving. Therefore, by detecting the piezoelectric data provided by the piezoelectric film sensor 201, fatigue driving monitoring can be performed on the driver acting on the seat cushion 100.

[0038] In addition, by integrating the physiological detection pad 20 and the pressure detection pad 10, the pressure detection pad 10 provides sensing data from the M×N sensing points, and the physiological detection pad 200 provides piezoelectric data, thereby providing high-precision physiological monitoring information.

[0039] It is worth noting that in some embodiments, the pressure sensing pad 10 includes a first fabric layer 1, a second fabric layer 2, and a conductive layer 3. The second fabric layer 2, the conductive layer 3, and the first fabric layer 1 are stacked sequentially along a third direction D3. The first fabric layer 1 is provided with M first conductive lines 11 spaced apart along a first direction D1, and the M first conductive lines 11 are located on the side of the first fabric layer 1 facing the conductive layer 3. The M first conductive lines 11 can be arranged in the first fabric layer 1 by weaving. The second fabric layer 2 is provided with N second conductive lines 21 spaced apart along a second direction D2, and the N second conductive lines 21 are located on the side of the second fabric layer 2 facing the conductive layer 3. When the seat cushion 100 is compressed, the first conductive lines 11 and second conductive lines 11 in the compressed area approach each other and contact the conductive layer 3, thus achieving conductivity at the sensing points. The N second conductive lines 21 can be arranged in the second fabric layer 2 by weaving. The M first conductive lines 11 and the N second conductive lines 21 intersect to form M×N sensing points. Through the M×N sensing points, when an occupant applies pressure to the seat cushion 100, when a certain area of ​​the pressure sensing pad 10 is compressed, the first fabric layer 1 and the second fabric layer 2 approach each other in that area. The first conductive wire 11 and the second conductive wire 21 contact each other at the corresponding sensing point through the conductive layer 3, forming an electrical connection and generating a clear electrical signal (e.g., voltage, current, capacitance, resistance, etc.). This signal can then be displayed on the host computer as the signal indicating pressure in the corresponding area. The pressure signals at each sensing point constitute the pressure sensing data of the pressure sensing pad 10.

[0040] In some embodiments, the pressure sensing pad 10 further includes an insulating layer 4, which surrounds the conductive layer 3 and is stacked between the first fabric layer 1 and the second fabric layer 2. Through the cooperation of the insulating layer 4 and the conductive layer 3, the insulating layer 4 can reduce the conductive interference between the peripheries of the first fabric layer 1 and the second fabric layer 2, so that the first conductive wire 11 and the second conductive wire 21 are induced and energized only in the area of ​​the corresponding conductive layer 3.

[0041] In some embodiments, the pressure sensing pad 10 further includes a first protective layer 5 and / or a second protective layer 6, wherein the first protective layer 5 may be disposed on the side of the first fabric layer 1 away from the conductive layer 3, and the second protective layer 6 may be disposed on the side of the second fabric layer 2 away from the conductive layer 3. The first protective layer 5 and the second protective layer 6 have a protective function, preventing the occupant from directly contacting the circuit components and reducing damage when the two are connected.

[0042] It is worth noting that the physiological detection pad 20 is fixedly connected to the pressure detection pad 10 by textiles or adhesive.

[0043] It is worth noting that in some embodiments, the seat cushion 100 also includes a heating pad 30. Along the thickness direction D3 of the seat cushion 100, the physiological detection pad 20, the pressure detection pad 10, and the heating pad 30 are stacked sequentially, i.e., the heating pad 30 covers the pressure detection pad 10, and the pressure detection pad 10 covers the physiological detection pad 20. Through the seat cushion 100, not only can M×N sensing points provide sensing data for pressure detection, but also piezoelectric data can be provided by the piezoelectric thin film sensor 201 for physiological detection, and heating can be achieved through the heating pad 30, expanding the application scenarios of the seat cushion 100. Furthermore, since the pressure detection pad 10 covers the physiological detection pad 20, and the heating pad 30 covers the pressure detection pad 10, it is not necessary to separately install the heating pad 30, the pressure detection pad 10, and the physiological detection pad 20 when installing the seat cushion 100, thus improving the ease and reliability of installation. Meanwhile, since the pressure sensing pad 10 covers the physiological sensing pad 20 and the heating pad 30 covers the pressure sensing pad 10, the seat cushion 100 forms a compact whole, thus the seat cushion 100 occupies less installation space and can improve space utilization.

[0044] It is worth noting that in some embodiments, the heating pad body 30 is provided with a heating resistance wire 301, which generates heat when energized, thereby providing a warm and comfortable riding experience for the occupants on the seat cushion 100.

[0045] It is worth noting that in some embodiments, when the seat cushion 100 is installed on a vehicle seat, the heating pad 30 is positioned with its back to the seat, i.e., closer to the occupant, while the physiological detection pad 20 is positioned facing the seat, i.e., further away from the occupant. This arrangement, with the heating pad 30 close to the occupant, reduces the heat transfer distance from the heating pad 30 to the occupant, thus requiring less heat to meet the occupant's needs and saving energy. Simultaneously, the pressure detection pad 10 and physiological detection pad 20 operate on the pressure exerted by the occupant on the seat cushion 100. Their sensitivity to the distance between the occupant and the pressure detection pad 10 and physiological detection pad 20 is low. Therefore, this specific arrangement allows for the provision of heat to the occupant with less energy while ensuring the accuracy of the sensing data provided by the pressure detection pad 10 and the piezoelectric data provided by the physiological detection pad 20.

[0046] It is worth noting that in some embodiments, the heating pad 30 is covered to the pressure sensing pad 10 by means of weaving or pasting.

[0047] It is worth noting that when the pressure detection pad 10 includes a first protective layer 5 and / or a second protective layer 6, the first protective layer 5 and the second protective layer 6 protect the pressure detection pad 10, which can reduce the damage to the pressure detection pad 10 caused by the heat generated by the heating pad 30.

[0048] It is worth noting that in some embodiments, the heating pad 30 is attached to the first protective layer 5 by means of weaving or bonding.

[0049] It is worth noting that in some embodiments, the seat cushion 100 also includes a circuit board 50 and a data acquisition device 40. The circuit board 50 is connected to the first conductive line 11, the second conductive line 21, the piezoelectric film sensor 201, and the heating pad 30, respectively, for power supply. The data acquisition device 40 is mounted on and electrically connected to the circuit board 50, and is used to acquire data from the sensing points of the pressure sensing pad 10, to acquire piezoelectric data from the physiological sensing pad 20, and may also be used to acquire current data from the heating pad 30, etc.

[0050] This utility model embodiment also provides a vehicle seat, which includes a seat cushion 100.

[0051] This utility model embodiment also provides a fatigue driving monitoring system, which includes a seat cushion 100 and a controller. The controller receives sensing data from the M×N sensing points, analyzes the sensing data to obtain pressure data, and issues control commands. The controller also receives piezoelectric data from a piezoelectric film sensor 201 to monitor the occupant's heart rate or respiratory rate, and then monitors fatigue driving based on changes in the occupant's heart rate or respiratory rate. Specifically, the controller can be connected to a data acquisition unit 40 to acquire pressure data from the pressure detection pad and piezoelectric data from the physiological detection pad. The controller can also be connected to a heating pad 30 to control the heating pad 30 to heat up.

[0052] It is worth noting that the program steps involved in the controller are existing program steps, and the controller also uses existing processors, such as Intel's i3 processor, AMD Ryzen processor, etc.

[0053] In this embodiment of the invention, the fatigue driving monitoring system can, on the one hand, obtain sensing data from the M×N sensing points formed by the first conductive wire 11 and the second conductive wire 21 of the seat cushion 100, thereby obtaining pressure data. This pressure data can be used for occupant posture analysis, occupant classification, etc. On the other hand, it can obtain piezoelectric data generated by the piezoelectric film sensor 201 of the seat cushion 100, thereby monitoring the occupant's heart rate or respiratory rate for fatigue driving monitoring. When the seat cushion 100 includes a heating pad 30, it can also provide a heating experience for the occupant. Furthermore, since the seat cushion 100 is a "two-in-one" structure of pressure detection pad 10 and physiological detection pad 20, or a "three-in-one" structure of heating pad 30, pressure detection pad 10, and physiological detection pad 20, the seat cushion 100 forms a compact whole. This makes the seat cushion 100 easy to install and occupies little installation space, thus improving space utilization.

[0054] It should be noted that while the preferred embodiments of this utility model are provided in the specification and accompanying drawings, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this utility model; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A seat cushion, characterized in that, include: Physiological detection pads and pressure detection pads are stacked in the thickness direction of the seat cushion; The pressure detection pad includes M first conductive lines spaced apart along a first direction and N second conductive lines spaced apart along a second direction. The M first conductive lines and the N second conductive lines intersect each other to form M×N sensing points. The physiological detection pad includes a plurality of piezoelectric thin film sensors; projected along the thickness direction of the seat pad, each of the piezoelectric thin film sensors is offset from any of the first conductive lines, and each of the piezoelectric thin film sensors is offset from any of the second conductive lines.

2. The seat cushion according to claim 1, characterized in that, The pressure sensing pad includes a first fabric layer, a conductive layer, and a second fabric layer stacked sequentially. The first conductive line is disposed on one side of the first fabric layer facing the conductive layer, and the second conductive line is disposed on one side of the second fabric layer facing the conductive layer.

3. The seat cushion according to claim 2, characterized in that, The pressure sensing pad also includes an insulating layer that surrounds the conductive layer and is stacked between the first fabric layer and the second fabric layer.

4. The seat cushion according to claim 2, characterized in that, The pressure detection pad also includes a first protective layer, which is disposed on the side of the first fabric layer away from the conductive layer. And / or, the pressure sensing pad further includes a second protective layer disposed on the side of the second fabric layer away from the conductive layer.

5. The seat cushion according to claim 1, characterized in that, The physiological detection pad is fixedly connected to the pressure detection pad by weaving or adhesive.

6. The seat cushion according to any one of claims 1-5, characterized in that, The seat cushion also includes a heating pad, and the physiological detection pad, pressure detection pad and heating pad are stacked in sequence, with the heating pad covering the pressure detection pad.

7. The seat cushion according to claim 6, characterized in that, The heating pad is equipped with a heating resistance wire.

8. The seat cushion according to claim 6, characterized in that, The heating pad is fixedly connected to the pressure sensing pad by weaving or adhesive.

9. A vehicle seat, characterized in that, Includes the seat cushion as described in any one of claims 1-8.

10. A fatigue driving monitoring system, characterized in that, Includes the seat cushion and controller as described in any one of claims 1-8; The controller includes a function for receiving sensing data from the M×N sensing points, and the controller also includes a function for receiving piezoelectric data from the piezoelectric thin film sensor.

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