seat

Abstract

The objective is to provide a sheet that can detect sweating using a heating element. [Solution] The seat comprises a first heater wire H1 and a second heater wire H2 that generate heat when energized, a control unit 100, and a measurement circuit 90. The second heater wire H2 is not connected to the first heater wire H1. The control unit 100 heats the seat surface of the seat by energizing the first heater wire H1 and the second heater wire H2. The measurement circuit 90 measures the capacitance between the first part of the first heater wire H1 and the second part of the second heater wire H2. The first part becomes the first electrode of the capacitor when measuring capacitance. The second part extends parallel to and adjacent to the first part at a predetermined distance, and becomes the second electrode of the capacitor when measuring capacitance.

Description

Technical Field

[0001] The present invention relates to a seat.

Background Art

[0002] Conventionally, there is known a technique in which heater wires provided in a seat cushion and heater wires provided in a seat back are used as respective electrodes of a capacitor of a capacitance sensor (see Patent Document 1). In this technique, a change in capacitance between each electrode due to the presence or absence of a person is detected by measuring the oscillation frequency of a circuit, and it is determined that a person is sitting when the frequency becomes lower than a predetermined frequency.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the prior art, although it is possible to determine the presence or absence of a person by using heater wires, it is not possible to detect sweating.

[0005] Therefore, an object of the present invention is to provide a seat capable of detecting sweating by using heater wires.

Means for Solving the Problems

[0006] The seat includes a first heater wire, a second heater wire, a control unit, and a measurement circuit. The first heater wire generates heat when energized. The second heater wire generates heat when energized. The second heater wire is not connected to the first heater wire. The control unit heats the seating surface of the seat by energizing the first heater wire and the second heater wire. The measurement circuit measures the capacitance between the first portion of the first heater wire and the second portion of the second heater wire. The first part becomes the first electrode of the capacitor when measuring capacitance. The second part extends parallel to and adjacent to the first part at a predetermined distance, and becomes the second electrode of the capacitor when measuring capacitance.

[0007] Since the first part of the first heater wire and the second part of the second heater wire extend parallel and adjacent to each other, it is possible to detect whether sweat has entered the space between the first and second parts by measuring the capacitance of the capacitor formed by the first and second parts.

[0008] Furthermore, the first and second parts may be formed in a bellows-like shape with multiple folds.

[0009] By forming the first and second parts in a bellows-like shape, the surface area of ​​each electrode in the capacitor can be increased.

[0010] The seat may also be equipped with a pad that has ventilation holes for air to pass through. The first and second parts do not need to overlap with the ventilation holes when viewed from the seated person's side.

[0011] By configuring the first and second parts so that they do not overlap with the ventilation holes when viewed from the seated person's side, capacitance can be measured without being affected by the airflow from the ventilation holes.

[0012] The seat may also have a covering that extends over the pad. The upholstery comprises an upholstery body that comes into contact with the occupant and a backing material located on the back surface of the upholstery body, and the first and second parts may be located between the upholstery body and the backing material.

[0013] By positioning the first and second parts between the main skin and the backing material, it becomes easier to detect sweat compared to, for example, a configuration where the first and second parts are positioned between the skin and the pad.

[0014] Furthermore, the control unit may determine whether or not the seated person has started sweating based on the capacitance measured by the measurement circuit, and if it determines that the person has started sweating, it may reduce the amount of current supplied to the first heater wire and the second heater wire.

[0015] By configuring the system to reduce the amount of electricity supplied to each heater wire when sweating is detected, the comfort of the seated person can be improved.

[0016] Furthermore, the first and second parts may be positioned in a location where the psychological sweating of the seated person can be detected.

[0017] The sheet may also include a first heater having a first heater wire and a second heater wire, and a second heater having a first heater wire and a second heater wire. The first and second parts of the first heater may be positioned to detect psychological sweating of the seated person, and the first and second parts of the second heater may be positioned to detect thermal sweating of the seated person. The control unit may determine that the sweating is psychogenic if it determines that the seated person is sweating based on information obtained from the first heater, and may determine that the sweating is thermogenic if it determines that the sweating is psychogenic if it determines that the seated person is sweating based on information obtained from the second heater.

[0018] This configuration allows us to understand the cause of sweating in seated individuals.

[0019] The seat may also include a seat body comprising a seat cushion and a seat back, a cushion heater provided on the seat cushion having a first heater wire and a second heater wire, and a back heater provided on the seat back having a first heater wire and a second heater wire. When measuring capacitance, the control unit may measure capacitance using a back heater if air is being blown from an outlet below the vehicle's air conditioner, or measure capacitance using a cushion heater if air is being blown from an outlet above the air conditioner.

[0020] According to this configuration, the capacitance can be measured without being affected by the air blowing of the air conditioner.

Effect of the Invention

[0021] According to the present invention, it is possible to provide a seat capable of detecting sweating by using a heater wire.

[0022] Further, by forming the first part and the second part in a bellows shape, the area of each electrode of the capacitor can be increased.

[0023] Further, by adopting a configuration in which the first part and the second part do not overlap the ventilation holes when viewed from the seated person side, the capacitance can be measured without being affected by the wind from the ventilation holes.

[0024] Further, by adopting a configuration in which the first part and the second part are located between the skin body and the backing material, for example, compared with a configuration in which the first part and the second part are located between the skin and the pad, it becomes easier to detect sweating.

[0025] Further, by adopting a configuration in which the energization amount to each heater wire is reduced when it is determined that sweating has occurred, the comfort of the seated person can be improved.

[0026] Further, by adopting a configuration in which the control unit determines that it is mental sweating based on the information obtained from the first heater and determines that it is thermoregulatory sweating based on the information obtained from the second heater, the cause of the sweating of the seated person can be grasped.

[0027] Further, when the air is blown from the air outlet under the air conditioner of the vehicle, the capacitance is measured by the back heater, and when the air is blown from the air outlet above the air conditioner, the capacitance is measured by the cushion heater. By adopting such a configuration, the capacitance can be measured without being affected by the air blowing of the air conditioner.

Brief Description of the Drawings

[0028] [Figure 1] This is a perspective view of a vehicle seat according to the first embodiment. [Figure 2] This diagram shows the cushion heater installed in the pad. [Figure 3] This diagram shows the cushion heater, measurement circuit, and control unit. [Figure 4] This is a diagram showing a cushion heater according to the second embodiment. [Figure 5] This diagram shows the relationship between the pad and the cushion heater according to the third embodiment. [Figure 6] This is a diagram showing the skin according to the fourth embodiment. [Figure 7] This is a diagram showing a vehicle seat according to the fifth embodiment. [Modes for carrying out the invention]

[0029] [First Embodiment] The first embodiment of the present invention will be described in detail below with reference to the drawings as appropriate. As shown in Figure 1, the seat according to the first embodiment is configured as a vehicle seat S used in the driver's seat, passenger seat, etc. of an automobile. The vehicle seat S comprises a seat body S0 and a cushion heater 10. The seat body S0 mainly comprises a seat cushion S1 on which the occupant sits, a seat back S2 that supports the occupant's upper body, and a headrest S3 that can support the occupant's head.

[0030] The seat cushion S1 mainly comprises a metal frame (not shown), a pad 1 made of cushioning material such as urethane foam, and a cover 2 made of synthetic leather or fabric. The pad 1 is placed over the frame, and the cover 2 is then placed over the pad 1.

[0031] The seatback S2 and headrest S3, like the seat cushion S1, consist of a frame, padding, and upholstery, with the padding covering the frame and the upholstery covering the padding.

[0032] The cushion heater 10 is provided in the seat cushion S1. The cushion heater 10 is located between the pad 1 and the upholstery 2.

[0033] As shown in Figure 2, the cushion heater 10 comprises a base fabric 11 made of nonwoven fabric and a first heater wire H1 and a second heater wire H2 that generate heat when electricity is applied.

[0034] The base fabric 11 has a first portion 11A, a second portion 11B, a third portion 11C, and a fourth portion 11D. The first section 11A is positioned to correspond to the seated person's thighs. The third section 11C is positioned to correspond to the seated person's buttocks. The first section 11A and the third section 11C are larger in the lateral direction than the second section 11B and the fourth section 11D.

[0035] The second section 11B is positioned between the first section 11A and the third section 11C, connecting the first section 11A and the third section 11C. The fourth section 11D extends backward from the third section 11C. The rear end of the fourth section 11D is larger in the left-right direction than the front end.

[0036] The first heater wire H1 and the second heater wire H2 are supported by the base fabric 11. The skin 2 sandwiches the first heater wire H1 and the second heater wire H2 between itself and the base fabric 11. The first heater wire H1 and the second heater wire H2 are fixed to the base fabric 11, for example, by being attached to the base fabric 11 with an adhesive. The first heater wire H1 and the second heater wire H2 have a portion that is positioned on the base fabric 11 and a portion that extends outward from the base fabric 11.

[0037] The first heater wire H1 is not connected to the second heater wire H2, and extends parallel to and adjacent to the second heater wire H2 on the base fabric 11 at a predetermined distance. In other words, the first heater wire H1 and the second heater wire H2 are arranged in parallel on the base fabric 11 at a certain distance apart. This allows the first heater wire H1 and the second heater wire H2, arranged in parallel on the base fabric 11, to function as a capacitor.

[0038] The predetermined interval can be, for example, less than or equal to the diameter of the metal wire of the first heater wire H1. Alternatively, the predetermined interval may be less than or equal to three times the diameter of the metal wire of the first heater wire H1, or less than or equal to five times the diameter of the metal wire.

[0039] To maintain a predetermined spacing between the heater wires H1 and H2 on the base fabric 11, for example, the heater wires H1 and H2 can be held together using adhesive tape or the like.

[0040] In this embodiment, the portion of the first heater wire H1 that rests on the base fabric 11 corresponds to the first portion, and the portion of the second heater wire H2 that rests on the base fabric 11 corresponds to the second portion. In the figure, the portions of each heater wire H1 and H2 that extend outward from the base fabric 11 are shown to be parallel at regular intervals, but in these portions, the heater wires H1 and H2 do not necessarily have to be parallel at regular intervals.

[0041] The first heater wire H1 and the second heater wire H2 located in the first part 11A of the base fabric 11 are formed in a bellows-like shape with multiple folds. Specifically, the heater wires H1 and H2 located in the area corresponding to the seated person's thighs are formed in a bellows-like shape.

[0042] The first heater wire H1 and the second heater wire H2, located at the third portion 11C of the base fabric 11, are also formed in a bellows-like shape with multiple folds. More specifically, each heater wire H1 and H2, located at the area corresponding to the seated person's buttocks, is formed in a bellows-like shape.

[0043] At least when a person is seated, a portion of the surface fabric or base fabric is placed between each heater wire H1 and H2 on the base fabric 11. When the fibers or other material placed between each heater wire H1 and H2 on the base fabric 11 absorb moisture, the dielectric constant between each heater wire H1 and H2 increases, causing the capacitance to increase.

[0044] Furthermore, even when no one is seated, the seat may be configured so that the outer skin or a part of the base fabric is positioned between the heater wires H1 and H2 on the base fabric 11. Alternatively, a component other than the outer skin and base fabric may be provided between the heater wires H1 and H2 on the base fabric 11. Examples of such components include sponges or fibers that have voids into which water vapor can enter.

[0045] As shown in Figure 3, the vehicle seat S further includes a measurement circuit 90 and a control unit 100. The measurement circuit 90 is a circuit that measures the capacitance between the first heater wire H1 and the second heater wire H2 on the base fabric 11. For example, a high-frequency oscillation circuit can be used as the measurement circuit 90.

[0046] One end H11 of the first heater wire H1 is connected to the control unit 100 via the measurement circuit 90, and the other end H12 is connected to the control unit 100 via the first switch 81. One end H21 of the second heater wire H2 is connected to the control unit 100 via the second switch 82, and the other end H22 is connected to the control unit 100. For convenience, in Figure 3, the first heater wire H1 is shown with a thick line and the second heater wire H2 is shown with a thin line.

[0047] The control unit 100 is configured to include, for example, a CPU, RAM, ROM, input / output circuits, etc. The control unit 100 is capable of performing a heating process and a capacitance measurement process. The control unit 100 can switch between the heating process and the capacitance measurement process by switching the first switch 81 and the second switch 82.

[0048] In the heating process, the control unit 100 heats the seat surface of the vehicle seat S by energizing the first heater wire H1 and the second heater wire H2. Specifically, the control unit 100 performs the heating process by turning on the first switch 81 and the second switch 82, respectively. In the heating process, the control unit 100 flows, for example, a DC current through each of the heater wires H1 and H2.

[0049] In the capacitance measurement process, the control unit 100 turns off the first switch 81 and the second switch 82, respectively, and measures the capacitance using the measurement circuit 90. Specifically, the control unit 100 causes the measurement circuit 90 to oscillate and measures the capacitance based on the frequency.

[0050] During capacitance measurement, the first heater wire H1 on the base fabric 11 becomes the first electrode of the capacitor. During capacitance measurement, the second heater wire H2 on the base fabric 11 becomes the second electrode of the capacitor.

[0051] The control unit 100 has a function to determine whether or not the seated person has sweated based on the capacitance measured by the measurement circuit 90. Specifically, for example, the control unit 100 determines that the seated person has sweated if the capacitance measured by the measurement circuit 90 exceeds a threshold.

[0052] If the control unit 100 determines that sweating has occurred, it reduces the amount of current supplied to the first heater wire H1 and the second heater wire H2 in the next heating process. For example, when the control unit 100 receives an instruction to heat the cushion heater 10, it executes the heating process and raises the temperature of the cushion heater 10 to the target temperature. Once the temperature of the cushion heater 10 reaches or exceeds the target temperature, the control unit 100 repeatedly executes and stops the heating process to maintain the temperature of the cushion heater 10 at the target temperature.

[0053] When the control unit 10 is maintaining the temperature of the cushion heater 10 at a target temperature, the control unit 100 performs capacitance measurement processing during times when heating is not being performed. If the control unit 100 determines, based on the results of the capacitance measurement processing, that the person sitting is sweating, it lowers the target temperature to reduce the amount of current supplied to each heater wire H1 and H2 during the subsequent heating process.

[0054] Next, a specific example of the operation of the control unit 100 will be described. When a person sitting in the vehicle seat S shown in Figure 1 turns on a heater switch (not shown), the control unit 100 performs a heating process until the temperature of the cushion heater 10 reaches the target temperature. Once the temperature of the cushion heater 10 reaches or exceeds the target temperature, the control unit 100 performs maintenance control to maintain the temperature of the cushion heater 10 at the target temperature by repeatedly starting and stopping the heating process.

[0055] During times when the maintenance control heating process is not being performed, the control unit 100 turns off switches 81 and 82 and activates the measurement circuit 90 to measure the capacitance of each heater wire H1 and H2 on the base fabric 11. If the control unit 100 determines, based on the capacitance, that the occupant has started to sweat, it reduces the target temperature of the cushion heater 10. As a result, the amount of current supplied during the next heating process is less than if the target temperature were not reduced, which can suppress further sweating by the occupant and improve comfort.

[0056] Furthermore, when the heating process is performed by PWM control, the control unit 100 may measure capacitance during periods when no power is supplied during PWM control. In this case, if the control unit 100 determines that the seated person is sweating based on capacitance and reduces the target temperature, the amount of power supplied during the next PWM control can be reduced compared to when the target temperature is not reduced.

[0057] As described above, the following effects can be obtained according to this embodiment. Since the heater wires H1 and H2 on the base fabric 11 extend parallel and adjacent to each other, it is possible to detect whether sweat has entered between the heater wires H1 and H2 on the base fabric 11 by measuring the capacitance of the capacitor formed by the heater wires H1 and H2 on the base fabric 11.

[0058] By forming the heater wires H1 and H2 on the base fabric 11 in a bellows-like shape, the area of ​​each electrode of the capacitor can be increased.

[0059] By configuring the control unit 100 to reduce the amount of current supplied to each heater wire H1 and H2 when it determines that sweating has occurred, the comfort of the seated person can be improved.

[0060] [Second Embodiment] Next, a second embodiment of the present invention will be described in detail with reference to the drawings as appropriate. Since this embodiment modifies some of the structure of the first embodiment described above, components that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0061] As shown in Figure 4, the cushion heater 210 according to the second embodiment has a base fabric 11 similar to that of the first embodiment, a first heater H30, and a second heater H40.

[0062] The first heater H30 is a heater that heats the central and right sides of the seated person's buttocks. The first heater H30 consists of a first heater wire H31 and a second heater wire H32 that generate heat when energized. The first heater wire H31 is formed in a bellows shape in the central and right sides of the third section 11C of the base fabric 11. The portion of the first heater wire H31 located in the central part of the third section 11C is the first portion P31 which functions as the first electrode of a capacitor.

[0063] The second heater wire H32 has a second portion P32 located in the central part of the third portion 11C, which functions as the second electrode of the capacitor. The second portion P32 extends parallel to and adjacent to the bellows-shaped first portion P31 at a predetermined distance. In the following description, the first portion P31 and the second portion P32 of the first heater H30 will also be referred to as the "first detection unit D1".

[0064] The first detection unit D1 is located in the center of the third part 11C. In other words, the first detection unit D1 is positioned to detect the psychological sweating of the seated person. When a person experiences psychological stress, they tend to sweat in areas with apocrine glands, such as around the anus. In this embodiment, by positioning the first detection unit D1 in the center of the third part 11C, which corresponds to the area around the seated person's anus, it is possible to detect the psychological sweating of the seated person.

[0065] The second heater H40 is a heater that heats the left side of the seated person's buttocks and thighs. The second heater H40 consists of a first heater wire H41 and a second heater wire H42 that generate heat when energized. The first heater wire H41 is formed in a bellows shape in the left side of the third part 11C and the right and left sides of the first part 11A of the base fabric 11. The portion of the first heater wire H41 located in front of the left side of the first part 11A is the first part P41 which functions as the first electrode of a capacitor.

[0066] The second heater wire H42 is formed in a bellows-like shape in the central part and the front part of the left side of the first part 11A. The portion of the second heater wire H42 located in the front part of the left side of the first part 11A is the second part P42 which functions as the second electrode of the capacitor. The second part P42 extends parallel to and adjacent to the bellows-shaped first part P41 at a predetermined distance. In the following description, the first part P41 and the second part P42 of the second heater H40 will also be referred to as the "second detection part D2".

[0067] The second detection unit D2 is positioned to detect thermal sweating from the seated person. In this embodiment, the second detection unit D2 is positioned to correspond to the left thigh of the seated person. By positioning the second detection unit D2 in this way, if the vehicle seat S is the driver's seat, the seated person's left foot does not leave the seat surface even if they operate the accelerator or brake with their right foot, making it possible to accurately detect thermal sweating from the left foot.

[0068] The first heater H30 is connected to the control unit 100 via a measurement circuit 90 and switches 81 and 82, similar to those in the first embodiment. The second heater H40 is also connected to the control unit 100 via a measurement circuit 90 and switches 81 and 82, similar to those in the first embodiment.

[0069] If the control unit 100 determines that the seated person is sweating based on the information obtained from the first detection unit D1 of the first heater H30, it determines that it is psychogenic sweating. If the control unit 100 determines that the seated person is sweating based on the information obtained from the second detection unit D2 of the second heater H40, it determines that it is thermogenic sweating.

[0070] As described above, according to the second embodiment, the cause of sweating in a seated person can be identified. If the control unit 100 determines that the sweating is psychological, it may, for example, play music that helps the seated person relax through the speaker. If the control unit 100 determines that the sweating is thermoregulatory, it may, for example, blow cool air from the vehicle's air conditioner.

[0071] [Third Embodiment] Next, a third embodiment of the present invention will be described in detail with reference to the drawings as appropriate. Since this embodiment is a modification of some of the structures of the second embodiment described above, components that are substantially the same as those in the second embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0072] As shown in Figure 5, the pad 1 according to the third embodiment has a ventilation hole 1A through which air passes. Although not shown in the figure, the vehicle seat S is equipped with a blower that blows air into the ventilation hole 1A or sucks air from inside the ventilation hole 1A. The ventilation hole 1A opens toward the occupant, and through the surface 2, it is possible to discharge air from the seat surface toward the occupant or to draw air from the occupant toward the seat surface.

[0073] The ventilation holes 1A are provided in four positions corresponding to the left thigh of the seated person and four positions corresponding to the right thigh. Each ventilation hole 1A is positioned so as viewed from the seated person's side does not overlap with the first detection unit D1 and the second detection unit D2.

[0074] By configuring the first detection unit D1 and the second detection unit D2 so that they do not overlap with the ventilation hole 1A when viewed from the seated person's side, capacitance can be measured without being affected by the airflow from the ventilation hole 1A.

[0075] [Fourth Embodiment] Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings as appropriate. Since this embodiment modifies some of the structure of the first embodiment described above, components that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0076] As shown in Figure 6, the upholstery 2 according to the fourth embodiment includes an upholstery body 2A that comes into contact with the occupant, a backing material 2B located on the back surface of the upholstery body 2A, and a cushion heater 10. The outer layer 2A is made of synthetic leather, fabric, or the like. Backing material 2B consists of urethane sponge or similar material. The cushion heater 10 is located between the outer skin body 2A and the backing material 2B.

[0077] By positioning the cushion heater 10 between the outer skin body 2A and the backing material 2B, it becomes easier to detect sweat compared to, for example, a configuration where the cushion heater 10 is positioned between the outer skin 2 and the pad 1.

[0078] [Fifth Embodiment] Next, a fifth embodiment of the present invention will be described in detail with reference to the drawings as appropriate. Since this embodiment is a modification of some of the structures of the first embodiment described above, components that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0079] As shown in Figure 7, the vehicle seat S according to the fifth embodiment includes a cushion heater 10 and a back heater 20, similar to those in the first embodiment. The back heater 20 is located on the seat back S2. More specifically, the back heater 20 is located between the upholstery and the padding of the seat back S2.

[0080] The back heater 20 has a structure substantially similar to that of the cushion heater 10. More specifically, the back heater 20 has a base fabric and first and second heater wires extending parallel and adjacent to each other at a predetermined interval on the base fabric. The back heater 20 is connected to the control unit 100 via a measurement circuit 90 and switches 81 and 82, similar to those in the first embodiment.

[0081] When measuring capacitance, the control unit 100 measures capacitance using the back heater 20 if air is being blown from the air outlet 310 below the vehicle's air conditioner. When air is being blown from the air outlet 320 above the air conditioner, the control unit 100 measures capacitance using the cushion heater 10. The location of the air conditioner's airflow can be obtained, for example, from the vehicle's ECU.

[0082] This configuration allows for capacitance measurement without being affected by the airflow from the air conditioner.

[0083] The present invention is not limited to the embodiments described above, and can be used in various forms as illustrated below.

[0084] In the above embodiment, a vehicle seat S used in an automobile was given as an example of a seat, but the present invention is not limited thereto and can also be applied to other seats, such as seats used in ships and aircraft, or seats used indoors.

[0085] The capacitance measurement process can be performed at any time during periods when no heating treatment is being performed. For example, the capacitance measurement process may be performed when the temperature inside the vehicle exceeds a predetermined value. In this case, if the control unit determines through the capacitance measurement process that the seated person is sweating, it may activate the vehicle's air conditioner or the fan installed in the seat to provide airflow to the seated person.

[0086] The first and second heater wires only need to be provided on a single component so that their relative positions do not change depending on the seat's orientation. For example, the first and second heater wires may be provided on the headrest and capable of detecting sweat from the occupant's head.

[0087] The first and second heater wires may be formed by printing a heater wire pattern onto a base fabric using methods such as vapor deposition or thermal transfer.

[0088] The elements described in the above embodiments and modifications may be implemented in any combination. [Explanation of Symbols]

[0089] 90 Measurement circuit 100 Control Unit H1 First heater wire H2 Second Heater Wire S Vehicle Seat

Claims

1. The first heater wire generates heat when power is applied, A second heater wire that generates heat when energized, and which is not connected to the first heater wire, A control unit that heats the seat surface by energizing the first heater wire and the second heater wire, The system includes a measuring circuit for measuring the capacitance between a first portion of the first heater wire and a second portion of the second heater wire, The first part becomes the first electrode of the capacitor when measuring capacitance. The sheet is characterized in that the second portion extends parallel to and adjacent to the first portion at a predetermined distance, and becomes the second electrode of a capacitor when measuring capacitance.

2. The sheet according to claim 1, characterized in that the first portion and the second portion are formed in a bellows-like shape that has been folded multiple times.

3. Equipped with a pad that has ventilation holes for air to pass through, The seat according to claim 1, characterized in that the first and second portions do not overlap with the ventilation holes when viewed from the seated person's side.

4. Equipped with a cover for the pad, The aforementioned epidermis is The main surface that comes into contact with the seated person, It has a backing material located on the back surface of the skin body, The sheet according to claim 1, characterized in that the first and second portions are located between the surface body and the backing material.

5. The control unit, Based on the capacitance measured by the aforementioned measurement circuit, it is determined whether or not the seated person has started to sweat. The sheet according to claim 1, characterized in that, when it is determined that sweating has occurred, the amount of current supplied to the first heater wire and the second heater wire is reduced.

6. The sheet according to claim 1, characterized in that the first and second parts are positioned in a location where the psychological sweating of a seated person can be detected.

7. A first heater having the first heater wire and the second heater wire, A second heater having the first heater wire and the second heater wire, The first and second portions of the first heater are positioned to detect the psychological sweating of the seated person. The first and second portions of the second heater are positioned to detect thermal sweating of the seated person. The control unit, If it is determined that the seated person is sweating based on the information obtained from the first heater, it is determined that this is psychogenic sweating. The sheet according to claim 1, characterized in that, if it is determined that a seated person is sweating based on information obtained from the second heater, it is determined that the sweating is due to thermoregulation.

8. The seat body includes a seat cushion and a seat back, A cushion heater provided in the seat cushion, comprising a cushion heater having the first heater wire and the second heater wire, A back heater provided on the seat back, comprising a back heater having a first heater wire and a second heater wire, The control unit, When measuring capacitance, When air is blown from the vent below the vehicle's air conditioner, the capacitance is measured by the back heater. The sheet according to claim 1, characterized in that when air is blown from the air outlet above the air conditioner, the capacitance is measured by the cushion heater.

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