Human body detection sensor with capacitance reference and vehicle seat

Abstract

The utility model provides a human body detection sensor with a capacitance reference and a vehicle seat, the human body detection sensor with the capacitance reference comprises a base material, the base material is provided with a sensing part, and the sensing part is used for heating and sensing a human body; the area, away from the human body sitting end, of the base material is an avoiding area. The reference part has conductivity, the reference part is arranged in the avoiding area, the reference part is used for providing a capacitance reference value based on the environment, and the electric connection assembly is electrically connected with the induction part and the reference part. The reference part is arranged in the avoidance area of the human body detection sensor, and the capacitance reference value based on the environment is provided for the induction capacitance of the induction part, so that the measurement accuracy of the sensor can be remarkably improved, and the state of a passenger and the condition that a seat is occupied can be reflected more accurately. The influence of environmental factors and human body interference on the measurement result is reduced, and the capacitance value output by the sensor is more stable and reliable.

Description

Technical Field

[0001] The present application relates to the technical field of human body detection sensors, and in particular to a human body detection sensor with a capacitance reference and a vehicle seat. Background Art

[0002] In today's automotive industry, the comfort and safety of vehicle seats are increasingly important. Monitoring the occupant's status is crucial for improving seat performance and safety. Human detection sensors play a crucial role in this regard, but existing human detection sensors often lack accuracy and stability.

[0003] Due to environmental factors and the human body, the capacitance value sensed by the sensor may deviate, affecting the accurate judgment of the passenger's status. For example, temperature changes and humidity fluctuations can cause instability in the sensing capacitance. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a human body detection sensor and a vehicle seat with a capacitive reference.

[0005] In a first aspect, the present application proposes a human body detection sensor with a capacitance reference, comprising:

[0006] A substrate is provided with a sensing portion for heating and sensing a human body; an area on the substrate away from the seating end of the human body is a avoidance area;

[0007] a reference portion having a conductive property, disposed on the substrate within the avoidance area, and configured to provide a capacitance reference value based on an environment;

[0008] An electrical connection component is electrically connected to the sensing portion and the reference portion.

[0009] According to the technical solution provided in the embodiment of the present application, the sensing part is a first metal wire, and the first metal wire is provided on the substrate by sewing or gluing.

[0010] According to the technical solution provided in the embodiment of the present application, the reference portion includes a second metal wire, and the second metal wire is provided on the base material in the avoidance area by sewing or gluing.

[0011] According to the technical solution provided in the embodiment of the present application, the reference portion includes a conductive layer, and the conductive layer is formed by a conductive paste provided on the substrate in the avoidance area by printing.

[0012] According to the technical solution provided in the embodiment of the present application, the reference portion is a metal cloth, and the metal cloth is provided on the substrate in the avoidance area by gluing.

[0013] According to the technical solution provided in the embodiment of the present application, the reference portion includes a reference capacitor element arranged in the human body detection sensor, the reference capacitor element is provided on a flexible circuit board, and the flexible circuit board is integrally integrated into the substrate in the avoidance area.

[0014] According to the technical solution provided in the embodiment of the present application, a temperature sensor is provided on the substrate, and the temperature sensor is used to sense the heating temperature of the first metal wire during heating.

[0015] According to the technical solution provided in the embodiment of the present application, a positioning portion is provided on the flexible circuit board, and the flexible circuit board is fixed in the avoidance area of ​​the substrate by gluing.

[0016] According to the technical solution provided in the embodiment of the present application, the first metal wire is coiled on the substrate, and the second metal wire is coiled in the avoidance area of ​​the substrate and is placed outside the area formed by the coiling of the first metal wire.

[0017] In the second aspect, the present application proposes a vehicle seat, which includes a seat cushion and a backrest, wherein the area on the seat cushion that engages with the backrest is the avoidance area, and the avoidance area is equipped with a human body detection sensor with a capacitive reference as described above, and also includes a control module connected to the electrical connection component.

[0018] In summary, the present application proposes a human body detection sensor and a vehicle seat with a capacitive reference. The human body detection sensor with a capacitive reference includes: a substrate, a sensing part is provided on the substrate, and the sensing part is used to heat and sense the human body; the area on the substrate away from the seating end of the human body is an avoidance area; the reference part has conductive properties, and the reference part is provided on the substrate in the avoidance area, and the reference part is used to provide a capacitance reference value based on the environment, and the electrical connection component is electrically connected to the sensing part and the reference part.

[0019] Compared with the prior art, the present application has the following advantages: by providing a reference portion within the avoidance zone of the human detection sensor, the present application provides a capacitance reference value based on the environment for the sensing portion's inductive capacitance, significantly improving the accuracy of sensor measurements and more accurately reflecting the passenger's status. For example, under different ambient temperature conditions, this capacitance reference value serves as the reference value for the calculation process of determining whether a seat is occupied, accurately determining whether the seat is occupied, reducing the impact of environmental factors and human interference on the measurement results, and making the capacitance value output by the sensor more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a human detection sensor with a capacitive reference (the reference portion is a second metal wire) provided in an embodiment of the present application installed on a vehicle seat;

[0021] Figure 2 A schematic diagram of the structure of a human body detection sensor with a capacitive reference (the reference portion is a reference capacitor element) provided in an embodiment of the present application installed on a vehicle seat;

[0022] Figure 3 A schematic structural diagram of a human body detection sensor with a capacitive reference (the reference portion is a second metal wire) provided in an embodiment of the present application;

[0023] Figure 4 A schematic structural diagram of a human body detection sensor with a capacitance reference (the reference portion is a reference capacitor) provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the pins of a human body detection sensor with a capacitive reference (the reference portion is a second metal wire) provided in an embodiment of the present application;

[0025] Figure 6 A pin diagram of a human body detection sensor with a capacitive reference (the reference portion is a reference capacitor element) provided in an embodiment of the present application;

[0026] Figure 7 A pin diagram of a human body detection sensor (flexible circuit board) with a capacitive reference provided in an embodiment of the present application;

[0027] Figure 8 A schematic diagram of the pins connecting a human body detection sensor with a capacitive reference (the reference portion is a second metal wire) and a control module provided in an embodiment of the present application;

[0028] Figure 9 A schematic diagram of the pins connecting a human body detection sensor with a capacitive reference (the reference portion is a reference capacitor element) and a control module provided in an embodiment of the present application;

[0029] Figure 10 Schematic diagram of the installation position of the human detection sensor with capacitive reference provided in an embodiment of the present application on a real vehicle.

[0030] The text annotations in the figure represent:

[0031] 1. Base material; 11. Avoidance area; 2. Sensing part; 3. Second metal wire; 4. Flexible circuit board; 5. Reference capacitor element; 6. Backrest; 7. Seat cushion; 8. Temperature sensor; 9. Capacitance detection area; 10. Human seat end; 12. Lead pad; 13. Electrical connection component; 14. First metal wire; 15. Control module. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only the portions relevant to the invention are shown in the accompanying drawings.

[0033] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] Example 1

[0035] As mentioned in the background technology, in order to solve the problems in the prior art, this application proposes a human body detection sensor with a capacitance reference, please refer to Figure 1 Shown, including:

[0036] A substrate 1 is provided with a sensing portion 2 for heating and sensing a human body; an area of ​​the substrate 1 away from a seating end 10 of a human body is a avoidance area 11;

[0037] Specifically, the substrate 1 is commonly made of non-woven fabric, but may also be made of other insulating materials.

[0038] Specifically, the avoidance area 11 may be the engagement area between the seat cushion 7 and the backrest 6 of the automobile seat, or may be an area at the side of the seat.

[0039] The reference portion has a conductive property and is disposed on the substrate 1 within the avoidance area 11 . The reference portion is used to provide a capacitance reference value based on the environment.

[0040] Specifically, since the reference portion is located in the avoidance area 11 and is not covered by the human body, the capacitance reference value obtained by the reference portion is not affected by the human body, is stable and accurate, and only senses environmental changes.

[0041] The electrical connection component 13 is electrically connected to the sensing part 2 and the reference part.

[0042] Specifically, the electrical connection component 13 may be a wiring harness, which includes a plurality of wires electrically connected to the sensing portion 2 , the reference portion, the control module 15 and other structures.

[0043] Because it is not affected by the human body and has the same rate of change as the inductive capacitance of the human body detection sensor, this sensor structure avoids the need for temperature and humidity sensors and avoids overly complex software algorithms. It can determine whether a seat is occupied. Specifically, after the human body detection sensor is installed on the car seat, the seat is first placed in an unoccupied state. At this time, the sensing part 2 and the reference part of the human body detection sensor are in a specific environment. The capacitance value is measured simultaneously by the sensing part 2 and the reference part, and the capacitance reference value C provided by the reference part based on the environment is recorded. jz When someone sits on the car seat, the sensing part 2 will be affected by the human body and its capacitance value will change. The capacitance values ​​of the sensing part 2 and the reference part are measured again and recorded as C gy (someone) and C jz (Someone). Since the reference part is located in the avoidance area, the capacitance value generally changes little, so it can be considered that C jz (Someone) is approximately equal to C jz Calculate the change in capacitance of the inductive part 2 as C gy (Someone) and C jz When the change in the capacitance value of the sensing part 2 exceeds a certain threshold, it is determined that the seat is occupied; when the change in the capacitance value of the sensing part 2 is less than or equal to the threshold, it is determined that the seat is not occupied.

[0044] Furthermore, the sensing portion 2 is a first metal wire 14, which is attached to the substrate by sewing or gluing. For example, the first metal wire 14 includes a metal wire core made of a metal material with good electrical conductivity, such as copper or silver wire, and an insulating material covering the metal wire core. The first metal wire 14 is connected to the capacitive detection area 9 of the substrate 1 and serves as a sensing electrode, and also as a heating wire, achieving both sensing and heating functions.

[0045] Please refer to Figure 1 、 Figure 3 、 Figure 5 (with pin definitions, indicating the electrical connection status of each connection terminal), Figure 9 As shown, in a preferred embodiment, the reference portion includes a second metal wire 3, and the second metal wire 3 is provided on the substrate 1 in the avoidance area 11 by sewing or gluing.

[0046] Specifically, if sewing is used, the second metal wire 3 is securely sewn to the avoidance area 11 of the substrate 1 using sewing thread. During the sewing process, care should be taken to maintain uniform tension on the second metal wire 3 to avoid looseness or excessive tightness. Furthermore, the stitches should be tight to prevent the second metal wire 3 from falling off during use.

[0047] If gluing is used, an adhesive layer is provided on the substrate 1 in the avoidance area 11 , and then the second metal wire 3 is arranged in the avoidance area 11 according to a set shape, and pressed to bond the second metal wire 3 to the substrate 1 .

[0048] In a preferred embodiment, the reference portion includes a conductive layer, and the conductive layer is formed by a conductive paste provided on the substrate 1 in the avoidance area 11 by printing.

[0049] Specifically, the conductive paste is printed on the conductive layer in the avoidance area by screen printing, inkjet printing, etc. During the printing process, it is important to control the thickness and uniformity of the printing to ensure stable conductive properties of the conductive paste.

[0050] In a preferred embodiment, the reference portion is a metal cloth, and the metal cloth is provided on the substrate 1 in the avoidance area 11 by gluing.

[0051] Specifically, the metal cloth is cut into a suitable shape and size according to the size of the avoidance area 11 , ensuring that the metal cloth can meet the capacitance detection requirements without exceeding the avoidance area 11 .

[0052] Please refer to Figure 2 、 Figure 4 、 Figure 6 As shown, in a preferred embodiment, the reference portion includes a reference capacitor element 5 arranged in the human body detection sensor, please refer to Figure 7 As shown, the reference capacitor 5 is provided on the flexible circuit board 4, and the flexible circuit board 4 is integrated as a whole into the substrate 1 within the avoidance area 11; wherein, the lead pads 12 are used to fix each of the wires in the wiring harness of the electrical connection component 13 to the flexible circuit board 4 respectively.

[0053] Furthermore, a temperature sensor 8 is provided on the substrate 1 , and the temperature sensor 8 is used to sense the heating temperature of the first metal wire 14 during heating.

[0054] Specifically, the temperature sensor 8 cooperates with the heating function of the first metal wire 14 to achieve temperature detection.

[0055] In a preferred embodiment, the flexible circuit board 4 is connected to the circuit of the human body detection sensor by welding.

[0056] Specifically, when the reference portion is in the form of a flexible printed circuit board 4 (FPC), it is connected to the circuit of the human body detection sensor by welding, which is stable and reliable.

[0057] In a preferred embodiment, a positioning portion is provided on the flexible circuit board 4 , and the flexible circuit board 4 is fixed in the avoidance area 11 of the substrate 1 by gluing.

[0058] Specifically, the positioning portion on the flexible circuit board 4 can be a positioning hole or a positioning notch, and a positioning mark is provided on the substrate 1. The flexible circuit board 4 is fixed to a specified position within the avoidance area 11 of the substrate 1 by gluing, so that the positioning hole or positioning notch corresponds to the positioning mark, so that the flexible circuit board 4 can be installed at the specified position during installation.

[0059] In a preferred embodiment, the surface of the flexible circuit board 4 is covered with an insulating protective layer.

[0060] In a preferred embodiment, the welding points between the reference capacitor 5 and the flexible circuit board 4 are treated with anti-oxidation treatment.

[0061] Specifically, the surface of the flexible circuit board 4 is covered with an insulating protective layer, and the welding points between the reference capacitor 5 and the flexible circuit board 4 are treated with anti-oxidation to extend the service life and ensure the stability of the capacitance value.

[0062] In a preferred embodiment, the first metal wire 14 is coiled on the substrate 1 , and the second metal wire 3 is coiled in the avoidance area 11 of the substrate 1 and placed in the area formed by the coiling of the first metal wire 14 .

[0063] Specifically, in actual applications, the first metal wire 14 can be coiled on the substrate 1, and the second metal wire 3 can be coiled in the avoidance area 11 of the substrate 1 and placed in the area formed by the coiling of the first metal wire 14, which is equivalent to the first metal wire 14 surrounding the second metal wire 3, achieving a more compact and efficient layout, which helps to improve the integration and space utilization of the sensor.

[0064] In addition, please refer to Figure 1 and Figure 2 As shown, the second metal wire 3 can also be coiled in the avoidance area 11 of the substrate 1 and placed outside the area formed by the coiling of the first metal wire 14. Under this layout, the first metal wire 14 and the second metal wire 3 each occupy an independent area on the substrate and do not interfere with each other.

[0065] The second metal wire 3 is coiled within the avoidance area 11 of the substrate 1 and outside the area formed by the first metal wire 14. This layout offers multiple advantages: First, from a spatial perspective, this arrangement facilitates installation and maintenance of the two wires. Since they are located in separate areas, repair or replacement can be more accurately located without the increased difficulty of tightly entwining the two wires. Second, regarding signal transmission, the separate coiling areas reduce signal interference between the two wires. The first metal wire 14 is primarily used for sensing the human body, and the signal it generates is relatively sensitive. The second metal wire 3, serving as the reference element for providing a capacitance reference value, requires stable signal output. Placing them in separate areas reduces electromagnetic interference and improves signal accuracy and stability. Furthermore, from a design perspective, this layout provides more options for different application scenarios. Based on the specific structure and design requirements of the car seat, the positions of the first metal wire 14 and the second metal wire 3 can be flexibly adjusted to achieve optimal sensing and reference value provision.

[0066] Example 2

[0067] Based on Example 1, this embodiment proposes a vehicle seat, which includes a seat cushion 7 and a backrest 6. The area where the seat cushion 7 engages with the backrest 6 is the avoidance area 11. The human body detection sensor with a capacitive reference as described above is installed in the avoidance area, and also includes a control module 15 connected to the electrical connection component. Please refer to Figure 8 As shown, the connection method of the human detection sensor and the control module 15 in the embodiment in which the reference part is the second metal wire 3 is shown. Please refer to Figure 9 1 is a diagram showing a connection method between a human detection sensor and the control module 15 in which the reference portion is the reference capacitor element 5 .

[0068] Please refer to Figure 10 As shown, a human body detection sensor with a capacitance reference is installed in the engagement area of ​​the seat cushion 7 and the backrest 6, which can provide accurate and stable data support for the intelligent control of the seat and significantly improve the comfort and safety of the seat.

[0069] Specifically, a human body detection sensor with a capacitance reference, as proposed in Example 1, is installed on a vehicle seat. By providing a reference portion within the human body detection sensor, a capacitance reference value is provided. This capacitance reference value serves as the reference value for the seat occupancy determination process, accurately determining seat occupancy and more accurately reflecting the passenger's status. This facilitates intelligent adjustment of vehicle seats based on the passenger's actual situation, improving seat comfort and safety. For example, if the human body detection sensor detects an incorrect sitting posture or uneven pressure distribution, the seat can automatically adjust, reducing passenger fatigue and potential safety risks.

[0070] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A human body detection sensor with a capacitance reference, mounted on a car seat, characterized in that: include: A substrate (1), wherein a sensing portion (2) is provided on the substrate (1), and the sensing portion (2) is used for heating and sensing a human body; The area on the substrate (1) that is away from the end where the human body sits is the avoidance area (11); A reference portion having a conductive property, the reference portion being disposed on the substrate (1) within the avoidance area (11), and being used to provide a capacitance reference value based on an environment; An electrical connection component (13), wherein the electrical connection component (13) is electrically connected to the sensing portion (2) and the reference portion.

2. The human body detection sensor with a capacitance reference according to claim 1, characterized in that: The sensing portion is a first metal wire (14), and the first metal wire (14) is arranged on the base material (1) by sewing or gluing.

3. The human body detection sensor with capacitance reference according to claim 2, characterized in that: The reference portion comprises a second metal wire (3), and the second metal wire (3) is arranged on the base material (1) in the avoidance area (11) by sewing or gluing.

4. The human body detection sensor with capacitance reference according to claim 1, characterized in that: The reference portion includes a conductive layer formed by a conductive paste provided on the substrate (1) in the avoidance area (11) by printing.

5. The human body detection sensor with capacitance reference according to claim 1, characterized in that: The reference portion is a metal cloth, and the metal cloth is arranged on the base material (1) in the avoidance area (11) by gluing.

6. The human body detection sensor with capacitance reference according to claim 1, characterized in that: The reference portion includes a reference capacitance element (5), the reference capacitance element (5) is provided on a flexible circuit board (4), and the flexible circuit board (4) is integrally integrated onto the substrate (1) within the avoidance area (11).

7. The human body detection sensor with capacitance reference according to claim 2, characterized in that: A temperature sensor (8) is provided on the substrate (1), and the temperature sensor (8) is used to sense the heating temperature of the first metal wire (14) during heating.

8. The human body detection sensor with capacitance reference according to claim 6, characterized in that: A positioning portion is provided on the flexible circuit board (4), and the flexible circuit board (4) is fixed in the avoidance area (11) of the substrate (1) by gluing.

9. The human body detection sensor with capacitance reference according to claim 3, characterized in that: The first metal wire (14) is coiled on the substrate (1), and the second metal wire (3) is coiled in the avoidance area (11) of the substrate (1) and is placed outside the area formed by the coiling of the first metal wire (14).

10. A vehicle seat, characterized in that: The vehicle seat comprises a seat cushion (7) and a backrest (6), wherein the engagement area between the seat cushion (7) and the backrest (6) is the avoidance area (11), and the avoidance area (11) is provided with a human body detection sensor with a capacitive reference as described in any one of claims 1 to 9, and further comprises a control module (15) connected to the electrical connection component.

Images