Automobile seat occupant seat occupancy detection device and automobile seat

Abstract

The utility model relates to the technical field of automobile seat, specifically relates to automobile seat passenger occupies seat detection device and automobile seat, including heating resistance wire and touch metal wire, heating resistance wire and touch metal wire are all respectively into spiral shape, heating resistance wire and touch metal wire are mutually set in the clearance of spiral shape. Through the scheme, heating resistance wire and touch metal wire space reasonable arrangement make heating resistance wire and touch metal wire all have installation space, and touch metal wire can be located in the middle part of seat and can be opposite to the hip of human body.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, specifically to an automotive seat occupancy detection device and an automotive seat. Background Technology

[0002] Existing car seats have occupancy detection functions. That is, when someone is sitting in the seat, the seat can detect that someone is sitting in the seat, and then the seat will turn on some functions, such as automatic heating or ventilation. When the person leaves the seat, the seat detects that no one is sitting in the seat, and the seat automatically turns off some functions.

[0003] Current car seat occupancy detection functions are achieved through the car seat SBR technology. However, with this detection method, the seat cannot distinguish between a person sitting on the seat and a non-electrical heavy object placed on the seat. If a non-electrical heavy object is placed on the seat, the seat will mistakenly think that someone is sitting on the seat, resulting in inaccurate seat detection.

[0004] To solve this problem, the inventors used a car seat occupant occupancy detection device to detect capacitance, thereby achieving accurate detection of the human body in the seat. Specifically, since the human body is a conductor and can conduct electricity, the capacitance of the seat when no one is sitting is different from the capacitance when someone is sitting in the seat. The car seat occupant occupancy detection device directly or indirectly detects the change in capacitance, thereby determining whether a person is sitting in the seat.

[0005] Currently, some car seats have a heating function, which is achieved by energizing a heating resistance wire located beneath the seat cover. The occupant detection device for car seats includes a touch wire, which also needs to be installed inside the seat (specifically beneath the seat cover). However, the limited space inside the seat causes the heating resistance wire and the touch wire to encroach on each other's space, hindering their optimal arrangement. If the heating resistance wire is placed in the center of the seat cover, the touch wire can only be placed at the corners, reducing the contact area between the touch wire and the buttocks and thus impacting detection accuracy. Conversely, if the touch wire is placed in the center, the heating resistance wire cannot be positioned in the center of the seat, failing to achieve the necessary heating area and effect. Therefore, currently, the space requirements for installing both the heating resistance wire and the touch wire are mutually exclusive. Utility Model Content

[0006] The present invention aims to provide a vehicle seat occupancy detection device and a vehicle seat, so that the heating resistance wire and the touch metal wire are reasonably arranged in space, so that both the heating resistance wire and the touch metal wire have installation space, and both the touch metal wire and the heating resistance wire can be located in the middle of the seat cover layer and can be directly facing the buttocks of the human body.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a car seat occupancy detection device, comprising a heating resistance wire and a touch metal wire, both of which are wound into a spiral shape, with the touch metal wire located in the gap of the spiral shape of the heating resistance wire.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a car seat, wherein the car seat is equipped with a car seat occupancy detection device.

[0009] The principle and advantages of this solution are as follows: both the heating resistance wire and the touch metal wire are wound into spiral shapes, with the touch metal wire located within the gaps in the spiral shape of the heating resistance wire. This interweaves the heating resistance wire and the touch metal wire, maintaining a certain gap between them and preventing them from being directly attached. After being interlocked, both the heating resistance wire and the touch metal wire can be positioned simultaneously in the middle of the seat cover layer. The spatial arrangement of the heating resistance wire and the touch metal wire is reasonable, providing sufficient installation space for both on the seat.

[0010] The arrangement of the touch wires in this solution ensures a compact layout for both the heating resistance wire and the touch wire, preventing mutual interference during installation. When a person sits on the seat, the touch wire is positioned in the center of the seat, directly facing the person's buttocks. This maximizes the contact area between the touch wire and the buttocks, thereby improving detection sensitivity and accuracy. Simultaneously, the heating resistance wire is also positioned directly facing the buttocks, ensuring sufficient heating area and effective heating of the seat.

[0011] At the same time, the heating resistance wire and the touch metal wire are intertwined, which increases the overall strength of the heating resistance wire and the touch metal wire, making them less prone to breakage and damage.

[0012] Preferably, as an improvement, the spiral shape is a square spiral or a circular spiral.

[0013] Preferably, as an improvement, the heating resistance wire is a single strand wound into a spiral shape.

[0014] Preferably, as an improvement, the heating resistance wire is bent into two strands and wound into a spiral shape.

[0015] Therefore, the heating resistance wire is wound into a spiral shape. The heating resistance wire can be a single wire wound into a spiral shape, or it can be bent into two wires first and then wound into a spiral shape. By using the method of bending the heating resistance wire into two wires and then winding it into a spiral shape, the two free connection ends of the heating resistance wire can be brought close to each other, which facilitates connection with the two pins of other electronic components to form a closed circuit.

[0016] Preferably, as an improvement, it further includes two protective films, with the heating resistance wire and the touch metal wire located between the two protective films. Thus, the two protective films are attached to the outside of the heating resistance wire and the touch metal wire, protecting them and fixing them in place. This prevents the heating resistance wire and the touch metal wire from shifting, maintaining a stable relationship between them.

[0017] Preferably, as an improvement, the inner wall of the protective film is provided with grooves for placing the heating resistance wire and the touch metal wire; the grooves are spiral-shaped.

[0018] Therefore, the groove is used to hold the heating resistance wire and the touch metal wire. The groove also serves to limit the movement of the heating resistance wire and the touch metal wire, thus ensuring better fixation after the heating resistance wire and the touch metal wire are covered by the protective film, and making it less likely for the heating resistance wire and the touch metal wire to shift. Since both the heating resistance wire and the touch metal wire are spiral-shaped, the groove is also designed with a corresponding spiral shape, so as to accommodate the spiral-shaped heating resistance wire and the touch metal wire.

[0019] Preferably, as an improvement, a reinforcing strip is integrally formed on the outer wall of the protective film, and the reinforcing strip is set along the groove. Thus, the reinforcing strip can strengthen the protective film, making it less prone to bending. The reinforcing strip, being set along the groove, strengthens the grooved area, preventing the protective film from becoming weak in the grooved area.

[0020] Preferably, as an improvement, all grooves along the edge of the reinforcement strip are provided.

[0021] Preferably, as an improvement, the groove is provided in part of the reinforcing strip.

[0022] Preferably, as an improvement, it also includes a microcontroller, one end of which is connected to a protective resistor wire, and the other end of which is connected to the power supply ground; one end of the touch wire is electrically connected to the protective resistor wire.

[0023] Therefore, the protective resistor wire protects the entire circuit. Before someone sits on the seat, the entire circuit has parasitic capacitance between the contact wire and the connected wire to the power supply ground, as well as capacitance between the power supply ground and the earth. When someone sits on the seat, because the person is a conductor, the entire circuit also has series capacitance between the person and the earth, capacitance between the contact wire and the person, and capacitance between the person and the power supply ground. This changes the capacitance of the entire circuit. The microcontroller directly or indirectly detects the change in capacitance before and after someone sits on the seat, thus determining whether someone is sitting on it. The detection method of this scheme can distinguish between a human body and a non-energized heavy object. Even if a non-energized heavy object is placed on the seat, the non-energized heavy object will not cause a change in the capacitance of the entire circuit, and the seat will not have a false detection problem.

[0024] Preferably, as an improvement, the microcontroller is an 8-bit microcontroller from ChipON Microelectronics.

[0025] Preferably, as an improvement, the resistance value of the protective resistance wire is 450-500Ω. Attached Figure Description

[0026] Figure 1 A schematic diagram of the spiral structure formed by the touch metal wire and the heating resistance wire.

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of the protective membrane.

[0028] Figure 3 This is a schematic diagram of the capacitor in the circuit when the seat is not occupied.

[0029] Figure 4 This is a schematic diagram of the capacitor in the circuit when someone is sitting on the seat.

[0030] Figure 5 Equivalent block diagram for touch charging and discharging.

[0031] Figure 6 A block diagram illustrating the charging and discharging principle of touchscreens. Detailed Implementation

[0032] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 1. Protective resistance wire; 2. Touch metal wire; 3. Microcontroller; 4. Upper protective film; 5. Lower protective film; 6. Groove; 7. Reinforcing strip; 8. Heating resistance wire.

[0033] The basic implementation examples are as follows: Figures 1-4 As shown: a car seat, equipped with a car seat occupancy detection device.

[0034] The car seat occupancy detection device in this embodiment includes a microcontroller 3, a protective resistor wire 1, and a touch metal wire 2, combined with... Figure 3 As shown, one end of the microcontroller 3 is electrically connected to the protective resistor wire 1, and the other end of the microcontroller 3 is connected to the power ground; one end of the touch metal wire 2 is electrically connected to the protective resistor wire 1. In this embodiment, the resistance value of the protective resistor wire 1 is 450-500Ω, specifically 470Ω.

[0035] In this embodiment, a heating resistance wire 8 is also provided under the seat cover layer, combined with Figure 1 and Figure 2 As shown, the heating resistance wire 8 is bent into two strands, and then the two strands of heating resistance wire 8 are wound into a spiral shape. The touch metal wire 2 is also wound into a spiral shape, and the touch metal wire 2 is located in the gap between the two heating resistance wires 8. In this embodiment, the spiral shape refers to the shape formed by one end of the wire being located in the center and the other end being coiled outwards. In this embodiment, the spiral shape is a square spiral shape (wound into a square), but in other embodiments, the spiral shape can also be a circular spiral shape (wound into a circle). The reason for arranging the heating resistance wire 8 and the touch metal wire 2 in a spiral shape, with the touch metal wire 2 located within the spiral gap between the heating resistance wires 8, is that this arrangement ensures a compact fit between the two wires. Both wires can be mounted on the seat cover without interfering with each other. When mounted on the seat, both wires are positioned in the center, allowing the buttocks to be directly opposite the touch metal wire 2 when the user sits. This maximizes the contact area between the buttocks and the touch metal wire 2, improving the accuracy and sensitivity of the sensor's interaction with the user. Simultaneously, the heating resistance wire 8 is also directly aligned with the user's buttocks, ensuring a sufficient heating area and effective heating effect for the seat.

[0036] Of course, in other embodiments, the heating resistance wire 8 may not be bent into two strands, but may be directly wound into a spiral shape, with the touch metal wire 2 located in the gap of the spiral shape of the heating resistance wire 8.

[0037] In addition, in some implementations, combined with Figure 2As shown, the car seat occupancy detection device also includes two protective films, namely an upper protective film 4 and a lower protective film 5. A heating resistance wire 8 and a touch metal wire 2 are located between the two protective films, which are adhered together. The two protective films protect the heating resistance wire 8 and the touch metal wire 2, achieving relative fixation of the two and preventing relative displacement. Furthermore, grooves 6 for placing the heating resistance wire 8 and the touch metal wire 2 can be provided on the inner sidewalls of the protective films, which are close to each other; the grooves 6 are spiral-shaped. Thus, the heating resistance wire 8 and the touch metal wire 2 are positioned between the two protective films, respectively, within the grooves 6. The grooves 6 accommodate the heating resistance wire 8 and the touch metal wire 2, providing better limiting and fixing effect. In other embodiments, a reinforcing strip 7 is integrally provided on the outer sidewall of the protective film, and the reinforcing strip 7 is provided along part or all of the grooves 6. Since the groove 6 is spiral-shaped and the reinforcing strip 7 is set along the groove 6, the reinforcing strip 7 is also spiral-shaped. The reinforcing strip 7 strengthens the groove 6, making the protective film less prone to bending and less likely to be damaged during transportation and installation of the heating resistance wire 8 and the touch metal wire 2.

[0038] The principle behind this embodiment for detecting whether a seat is occupied is as follows: [Combined with...] Figure 3 As shown, before anyone sits in the seat, the circuit contains a protective resistor wire 1 and a contact metal wire 2. The capacitors in the circuit are: Capacitor Cp: Parasitic capacitance of the touch wire 2 and the connected wire to the power supply ground; Capacitor Cg: Capacitance between power supply ground and earth ground.

[0039] When someone sits in the seat, the capacitance in the circuit changes because the person is a conductor. Figure 4 As shown in the diagram, Rh simulates the resistance of the human body. In addition to capacitors Cp and Cg, the circuit also contains the following capacitors: Capacitor Ch: The series capacitance between the human body and the ground; Capacitance Ct: The capacitance formed between the touch wire 2 and the human body, similar to the structure of a parallel plate capacitor; And the capacitance formed between the human body and the power source ground.

[0040] The microcontroller 3 can directly or indirectly detect the capacitance of the seat before and after someone sits down. By detecting changes in capacitance, it can determine whether someone is sitting in the seat. When a non-charged object is placed on the seat, it will not cause a change in capacitance, thus preventing false detections.

[0041] The spiral distribution of the touch wire 2 in this embodiment ensures that the human buttocks are aligned with the touch wire 2, guaranteeing the area of ​​direct contact between them. This helps to ensure the size of the capacitance Ct formed, thereby improving detection accuracy and sensitivity.

[0042] In this embodiment, the microcontroller 3 specifically adopts an 8-bit machine from ChipON Microelectronics (automotive-grade KF8A series or industrial-grade KF8TS series).

[0043] In this embodiment, "direct detection" refers to directly detecting changes in the capacitance value in the circuit, while "indirect detection" refers to determining changes in the capacitance in the circuit by detecting the charging and discharging time of the capacitor.

[0044] The principle of indirect detection, specifically, involves the microcontroller determining whether a person is sitting in the seat by sampling the time it takes for the voltage value of the touch modulation capacitor Cx to reach the capacitor's touch reference voltage value. Combined with... Figure 5 As shown, the clock generator on the microcontroller controls CLK1 and CLK2 to operate as complementary, non-overlapping switches. This ensures that during the CLK1 closing cycle, VDD charges CS (CS being the parasitic capacitance on the touch channel), and during the CLK2 closing cycle, CS charges Cx. CLK1 and CLK2 can be represented here as a resistor Rs, whose relationship with the touch channel parasitic capacitance and the charging / discharging frequency is as follows: Where Fsw is the charging and discharging switching frequency, it can be seen that the larger the parasitic capacitance (or the larger the charging and discharging frequency), the smaller the equivalent resistance.

[0045] Depend on Figure 5 From the diagram on the right, we can analyze that: the RC charging circuit composed of Rs and Cx gives the voltage Vcx across Cx. The formula (VDD is the chip power supply voltage, τ=RsCx) is: .

[0046] Combination Figure 6 As shown, when Vcx = Vref (Vref is the reference voltage of the microcontroller's built-in comparator), replacing Vcx with Vref, the following relationship is obtained for the charge / discharge time t: .

[0047] As can be seen from the above formula, with VDD, Vref, and Fsw constant, the charging time t is directly proportional to the CX capacitance and inversely proportional to Cs. Therefore, when a person sits down, Cs increases (Cs = Cp + Cf, where Cp is the original parasitic capacitance and Cf is the human body capacitance), and the charging time t decreases. By detecting t, it can be determined whether someone is sitting in the seat.

[0048] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A vehicle seat occupancy detection device, characterized in that: It includes a heating resistance wire and a touch metal wire, both of which are wound into a spiral shape, with the touch metal wire located in the gap of the spiral shape of the heating resistance wire.

2. The vehicle seat occupancy detection device according to claim 1, characterized in that: The spiral shape can be either a square spiral or a circular spiral.

3. The vehicle seat occupancy detection device according to claim 1, characterized in that: It also includes two protective films, with the heating resistance wire and the touch metal wire located between the two protective films.

4. The vehicle seat occupancy detection device according to claim 3, characterized in that: The inner wall of the protective film is provided with grooves for placing the heating resistance wire and the touch metal wire; the grooves are spiral-shaped.

5. The vehicle seat occupancy detection device according to claim 4, characterized in that: A reinforcing strip is integrally provided on the outer wall of the protective film, and the reinforcing strip is arranged along the groove.

6. The vehicle seat occupancy detection device according to claim 1, characterized in that: It also includes a microcontroller, one end of which is connected to a protective resistor wire, and the other end of which is connected to the power ground; one end of the touch metal wire is electrically connected to the protective resistor wire.

7. The vehicle seat occupancy detection device according to claim 6, characterized in that: The microcontroller is an 8-bit machine from ChipON Microelectronics.

8. The vehicle seat occupancy detection device according to claim 6, characterized in that: The resistance of the protective resistance wire is 450-500Ω.

9. A car seat, characterized in that: The seat is equipped with the vehicle seat occupancy detection device as described in any one of claims 1-8.

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