JP2003004688A - Seat stuffiness detecting method, stuffiness eliminating method, and seat ventilation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately detect stuffiness and eliminate it without being affected by changed in a seating attitude or causing complication, etc., in a constitution. SOLUTION: This seat ventilation structure 10 comprises both a stuffiness detecting device 12 comprising right and left detecting electrodes 20-R and 20-L arranged in parallel at an interval in a seat cushion and utilizing the principle of a capacitance-type approximately switch and an air blowing device 14 comprising right and left ventilation path groups 44-R and 44-L formed of a plurality of flexible tubes 42 arranged in parallel on the detecting electrodes in at least the equivalent areas as those of the detecting electrodes. By actuation control over the blowing device 14 by the stuffiness detecting device 12 when the stuffiness detecting device 12 detects and determines the occurrence of stuffiness between a human body on a seat surface and a section in contact with the human body on the basis of the comparison between relative output values of the detecting electrodes 20-R and 20-L and a predetermined set value, it is possible to supply air between the human body and the section in contact with the human body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stuffiness detection method for a sheet, which detects occurrence of stuffiness between a human body and a human body contact portion on a sheet surface, and a stuffiness elimination method for a sheet which eliminates the stuffiness, and The present invention relates to a ventilation structure of a seat using a stuffiness detection method and a stuffiness elimination method.

[0002]

2. Description of the Related Art A seat of a vehicle such as an automobile is formed by covering a seat pad made of urethane or the like with a trim cover formed by laminating skins, wading and the like. The person's hips, thighs, and the like come into contact with the seat surface.

Here, since the seat pad, the wadding of the trim cover, etc. are usually made of urethane or the like having poor air permeability, they are different depending on various conditions such as temperature and humidity in the passenger compartment or continuous sitting time. When seated, so-called stuffiness often occurs between the human body and human body contact portions on the seat surface. The stuffiness between the human body and the human body contact portion on the seat surface may cause discomfort to the seated person in some cases, and this may cause the comfort of the seated person to be impaired.

Therefore, for example, there is known a structure in which stuffiness between the human body and a human body contact portion on the seat surface is detected, and when the stuffiness is detected, air is sent to the seat surface or the like to eliminate the stuffiness. ing.

Generally, a method is adopted in which a humidity sensor is arranged below the seating surface of a seat to detect stuffiness between the human body and human body contact portions on the seat surface. Also,
As a structure for sending air to the surface of the seat, that is, for ventilating air, for example, a structure in which an air passage and an air outlet are formed in a seat pad is known.

[0006]

By the way, the humidity sensor generally used in the known stuffiness detection method has a narrow detection range, and it may be considered that the humidity sensor cannot sufficiently cope with the change in the seating posture. Therefore, conventionally, it has been attempted to eliminate the problem in terms of this detection range by arranging humidity sensors at a large number of places, but by arranging a large number of humidity sensors in parallel, the configuration becomes complicated and the number of parts is increased. It is undeniable that the known configuration using the humidity sensor is inferior in its implementation because the cost is increased due to the increase of

Further, the seat pad undergoes compressive deformation due to seating. That is, in the configuration in which the air passage and the air outlet are formed by perforation in this seat pad,
The air passage due to compressive deformation and the air outlets are likely to be partially blocked. Therefore, there is an undeniable possibility that the performance and function of the ventilation structure will not be fully utilized.

According to the present invention, a stuffiness detection method and a stuffiness elimination method for a seat, which are capable of appropriately detecting stuffiness and eliminating stuffiness without being affected by changes in the seating posture and without inviting complication of the configuration or the like. , And the provision of a ventilation structure for the seat.

[0009]

In order to achieve this object, in the stuffiness detection method for a sheet according to the present invention, an ON / OFF switching is performed by a capacitance that changes depending on the approach of a dielectric. It uses the principle of proximity switches. In other words, the capacitance changes of the left and right detection electrodes that are placed side by side from the hip contact area of the seat cushion to the left and right thigh contact areas are monitored as output values of the detection electrodes, and this output value is The original comparison output value is compared with at least a preset upper limit value of stuffiness, and when the comparison output value of any one of the detection electrodes reaches the upper limit value of stuffiness, the human body on the sheet surface The occurrence of stuffiness is detected and determined.

Specifically, first, the initial value of the output value of each detection electrode is recognized, and then the first variation value calculated by subtracting the initial value from the output value of the detection electrode is compared before the seating detection. The output value is compared with a preset seating determination value, and when the first variation value of any of the detection electrodes exceeds the seating determination value, the seating of the occupant on the seat is detected and determined. Then, after the seating detection, the second fluctuation value calculated by subtracting the first fluctuation value from the output value of the detection electrode is compared with at least a preset upper limit value of stuffiness as a comparison output value after the seating detection, and either When the second variation value of the detection electrode reaches the stuffiness upper limit value, the occurrence of stuffiness between the human body and the human body contact portion on the sheet surface is detected and discriminated.

Further, in the sheet stuffiness eliminating method of the present invention, when the occurrence of stuffiness between the human body and the human body contact portion on the sheet surface is detected and discriminated in the stuffiness detecting method, it is detected at least in an area equivalent to the detection electrode. Air is sent to a ventilation path group consisting of a plurality of flexible tubes juxtaposed on the upper part of the electrode, and the air is sent between the human body-human body contact portion from a single outlet provided for each flexible tube,
When the comparative output value of both detection electrodes falls below a preset stuffiness lower limit value along with the delivery of air from the outlet, the delivery of air to the ventilation path group is stopped.

Further, according to the seat ventilation structure of the present invention, the left and right detection electrodes, which are spaced from the hip contact area of the seat cushion and the left and right thigh contact areas of the seat cushion, are arranged side by side. The mullet utilizing the principle of the electrostatic capacitance type proximity switch, which comprises a comparison / discrimination means for comparing a comparison output value based on the output value from the device with a predetermined set value and outputting an output signal corresponding thereto. A detection device and a group of left and right air passages formed of a plurality of flexible tubes juxtaposed on the detection electrode in the same area as at least the detection electrode, and
Equipped with a blast source for sending air to this ventilation path group, under the blowing of air from the blast source, air is sent between the human body-human body contact area from a single outlet provided for each flexible tube. And a blower formed to be possible.

Then, when the stuffiness detecting device detects and determines the occurrence of stuffiness between the human body and the human body contact portion on the seat surface based on the comparison between the comparison output value of the detection electrode and the predetermined set value, The ventilation structure of this seat is configured so that air can be sent out between the human body and the human body contact portion by controlling the operation of the air blower by the stuffiness detecting device.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a seat ventilation structure 10 according to the present invention includes a stuffiness detecting device 12 utilizing the principle of an electrostatic capacitance type proximity switch, and an air blower whose operation is controlled by the stuffiness detecting device. And a device (14).

As can be seen from FIGS. 2 and 3, in a seat 15 for a vehicle, such as an automobile, a bending portion where the center of the upper surface of the seat cushion 16 is a seating area for an occupant, that is, a seated person. 16a, the upper and left side portions of the upper surface thereof are defined as a sill portion 16b, and the side peripheral surface of the seat cushion is defined as a gusset portion 16c. Then, in the stuffiness detection device 12 using the principle of the electrostatic capacitance type proximity switch used in the present invention, the pair of left and right detection electrodes 20-L, 20-R having substantially the same area are the same as those of the seat cushion 16. Internally provided at the left and right separated positions of the bent portion 16a,
In other words, it is built-in.

As shown in FIG. 3, in the present invention,
Butt contact area where the buttocks of a seated occupant (seat) come into contact
22 and the thigh contact regions 24-L, 2 where the left and right thighs come into contact
The 4-R and the left and right detection electrodes 20-L, 20-R are assumed in advance in the bending portion 16a of the seat cushion, and are located at the left and right separated positions that hang from the hip contact area to the left and right thigh contact areas.
Are arranged respectively.

As can be seen from FIG. 4, the seat cushion 16 has a seat pad 28, which is usually an elastic body,
Since it is formed by covering with the trim cover 34 formed by sticking the outer skin 30 and the wadding 32, for example, as shown in the drawing, the detection electrode 20 for the seat cushion is used for the interposition between the wadding and the seat pad. -L, 20-
It is embodied as an internal part of R in the embodiment of the present invention.

As the detection electrodes 20-L and 20-R, conductive and flexible materials such as a conductive film or a conductive cloth can be used.

As can be seen from FIG. 1, the stuffiness detecting device 12 of the present invention has an oscillation circuit, for example, a high-frequency oscillator 36, and outputs from each detection electrode, in addition to the detection electrodes 20-L and 20-R. A comparison output value based on a value is compared with a predetermined set value, and an output signal corresponding to that is output, for example,
The comparison / determination means 38 including a CPU is provided. Then, the change in the oscillation frequency from the high-frequency oscillator (oscillation circuit) 36 that accompanies the change in the capacitance of the detection electrodes 20-L, 20-R is converted into an electric signal, and this is converted in the CPU (comparison / determination means) 38. The stuffiness detection device 12 is configured to generate an ON / OFF signal as a result of comparison with a predetermined set value.

The left and right detection electrodes 20-L, 20-R are connected to a switching means, for example, an automatically controlled changeover switch 40 having a corresponding number of changeover contacts, and the changeover of the changeover switch by the CPU 38 is performed. Originally, the high frequency oscillator 36 is selectively and alternately connected.

Here, as shown in FIG.
In addition, the seating judgment that is the criterion for seating of the human body (occupant)
Value e_ThThe human body touches the surface of the seat cushion 16.
Of the stuffiness between the human body and the human body
Mure upper limit e which is the criterion _MU, And human-body contact
Lower limit e of stuffiness that is the criterion for eliminating stuffiness between touched parts
_MLAnd are compared with the comparison output value of the detection electrodes 20-L, 20-R.
It is preset in the CPU 38 as a setting value to be set. That
The comparison output value of the detection electrodes 20-L, 20-R to the seating judgment value e
_ThCompared with, the comparison output value of one of the detection electrodes is seated
When the judgment value is exceeded, the seat cushion 16, that is,
While detecting and determining the seating of the occupant on the seat 15 of
After seating is detected, the comparison output value from the detection electrode is set to the upper limit value e
_MU, And stuffiness lower limit e_MLCompare with
When the comparative output value of the output electrode reaches the upper limit of stuffiness,
The comparison output value of both detection electrodes is below the lower limit
When blown, the blower 14 is activated by the stuffiness detector 12.
The seat ventilation structure 10 of the present invention is configured to control
Has been done.

As can be seen from FIG. 1, the blower unit 14 according to the present invention includes left and right ventilation passage groups 44-L, 44-R formed by juxtaposing a plurality of flexible tubes 42 and the ventilation passage groups. And a blower source 46 for sending in air.

Flexible tube 4 forming the ventilation path group 44-L, 44-R
2 is thin, for example, outer diameter φ0.9 mm, inner diameter φ0.4 m
A polyurethane tube of about m can be used, and as shown in FIGS. 2 to 4 and 6, each air passage group is located above the detection electrodes 20-L, 20-R and is in the same area as this detection electrode. ,
That is, they are arranged over almost the same range. As can be seen from FIGS. 4 and 6, in the embodiment of the present invention, the air passage groups 44-L and 44-R are formed between the outer skin 30 and the wadding 32 that form the trim cover 34. It is arranged.

As shown in FIGS. 1 and 7, the flexible tubes 42 forming the ventilation path groups 44-L and 44-R are
For example, it is connected to the air pump 46 via a distribution joint 48. As can be seen from FIG. 6 in addition to FIG. 7, the tip of the flexible tube 42 is closed by the cap 50 so that the air from the air pump (blower source) 46 is, for example, V-cut or U-cut. The single outlet 52 formed in the flexible tube 42 by cutting or the like
The ventilation passage groups 44-L and 44-R are configured so that they can be blown out from.

As shown in FIG. 7, a flexible tube
The blowout port 52 of 42 is provided so that the air can be blown out in almost the entire region of the ventilation path groups 44-L, 44-R, for example, shifted for each flexible tube.

As shown in FIG. 1, the air pump 46 of this blower is a CPU connected to the CPU 38 of the stuffiness detector 12.
Relay contact RL1 of control relay RL1 capable of bias control by
connected to a. That is, according to this configuration, ON / OFF of the air pump 46, and consequently, operation control of the blower 14,
This is performed by the output signal from the CPU 38 of the stuffiness detector.

The operation of the stuffiness detection device 12 and the blower device 14 in this seat ventilation structure 10 will be described below with reference to the circuit diagram of FIG. 1 based on the flowchart of FIG. 8 and the output diagram of FIG. explain.

As can be seen from FIG. 8, the stuffiness detection device
In 12, first, the detection electrodes 20-L, 20- in CPU 38
The output values of R are initialized (initialized), and the output values e ₁ and e ₂ at this point are recognized as their initial values e ₁₀ and e ₂₀ , respectively (102). Then, next, the output values e ₁ and e ₂ of the detection electrodes 20-L and 20-R, which change thereafter, are measured (104), and the initial values e ₁₀ and e ₂₀ are subtracted from these output values to obtain the respective values. First variation value e ₁₁ , e for each detection electrode
₂₁ is calculated (106).

Next, based on the output values e ₁ and e ₂ of the detection electrodes 20-L and 20-R, the first variation values e ₁₁ and e ₂₁ which are comparison output values before seating detection are obtained. , The seating determination value e _Th, and whether or not the seat 15 is seated is detected and determined depending on whether the first fluctuation value of any of the detection electrodes exceeds the seating determination value (108).

The first fluctuation values e ₁₁ and e ₂₁ are the seating determination values e
If it is less than _Th , NO is determined in step (108). When the human body, which is a dielectric body, approaches the detection electrodes 20-L, 20-R due to the sitting, and the first fluctuation values e ₁₁ and e ₂₁ exceed the sitting determination value e _{T h} as shown in FIG. 5, In step (108) of FIG. 8, YES is determined, and seating on the seat 15 is detected.

As shown in FIG. 5, after this seating detection,
The comparison output value of the detection electrodes 20-L, 20-R is changed. That is, after YES is determined in step (108) of FIG.
The output values e ₁ , e _{2 of} the detection electrodes 20-L, 20-R that change after that
By subtracting the first fluctuation values e ₁₁ and e ₂₁ from
The second variation values e ₁₂ and e ₂₂ for each detection electrode are calculated (11
0).

The output values e ₁ , e of the detection electrodes 20-L, 20-R
_Second based on ₂ which is the comparison output value after seating detection
The fluctuation values e ₁₂ and e ₂₂ are compared with the stuffy upper limit value e _MU and the stuffy lower limit value e _ML (112). Then, until the second fluctuation values e ₁₂ and e _{22 of} any of the detection electrodes 20-L and 20-R reach the stuffiness upper limit value e _MU , it is determined to be NO in this step (112), and next, this By comparing the second variation value with the stuffiness lower limit value e _ML , it is determined whether or not the second variation values of both detection electrodes have dropped below the stuffiness lower limit value (11).
Four).

For example, if the second fluctuation values e ₁₂ and e _{22 of} the detection electrodes 20-L and 20-R are less than the stuffiness upper limit value e _MU , as shown in FIG. 5, the blower 14 is turned off, that is, the air pump. Four
OFF of 6 continues. Then, as the humidity rises between the human body and the human body contact portion on the sheet surface, the detection electrodes 20-L, 20-
When the second variation values e ₁₂ and e _{22 of} R increase and the second variation value of any of the detection electrodes reaches the stuffiness upper limit value e _MU , YES is determined in step (112) of FIG. 8, that is, the human body on the seat surface. -It is determined that stuffiness occurs between human body contact parts, and the relay contact RL1a is turned on when the control relay RL1 is energized.
The air pump 46 starts feeding the air between the human body and the human body contact site through the ventilation path groups 44-L, 44-R (116).
(See Figure 5).

When the air is sent in through the ventilation path groups 44-L and 44-R, the humidity between the human body and the human body contact portion on the seat surface is lowered. And this ventilation path group 44-L, 44-R
The second fluctuation values e ₁₂ and e _{22 of the} detection electrodes 20-L and 20-R decrease due to the air flow through the detection electrodes 20-L and 20-R.
When the second fluctuation value of L, 20-R falls below the stuffiness lower limit value e _ML , NO is determined in step (112) of FIG.
When it is determined to be YES in 4) and it is determined that the stuffiness between the human body and the human body contact portion on the seat surface is eliminated, the relay contact RL1a associated with the deactivation of the control relay RL1 is determined.
When the switch is turned off, the air pump 46 stops feeding the air between the human body and the human body contact portion through the ventilation path groups 44-L and 44-R (118) (see FIG. 5).

As described above, the stuffiness detection method and the stuffiness elimination method of the present invention are based on the principle of a capacitance type proximity switch that switches ON / OFF according to the capacitance that changes with the approach of the dielectric. We are using.

According to such a method utilizing the principle of the capacitance type proximity switch, the change in the ambient humidity can be detected in a relatively wide range. Further, in the present invention, the detection electrode 20-
Since L, 20-R are laid side by side from the hip contact area 22 of the seat cushion 16 to the left and right thigh contact areas 24-L, 24-R, when the seating posture changes, However, the reliability of detection of stuffiness between the human body and the human body contact portion on the sheet surface is improved.

Then, it is sufficient if the detection electrodes 20-L, 20-R are placed side by side from the hip contact region 22 to the left and right thigh contact regions 24-L, 24-R, respectively. It is possible to reliably prevent complication.

Further, in the seat stuffiness eliminating method of the present invention, when the occurrence of stuffiness between the human body and the human body contact portion on the seat surface is detected and discriminated, air is supplied to the air passage groups 44-L, 44-R. Air is sent between the human body and the human body contact area.

In this method, since the plurality of flexible tubes 42 are juxtaposed to form the air passage groups 44-L and 44-R, the air permeability of the air passage groups is deteriorated even when seated. Can be reliably prevented. Therefore, the certainty of the blown air is improved, and the stuffiness caused by the blown air is surely eliminated.

Further, by arranging the plurality of flexible tubes 42 side by side, the contact of the ventilation path groups 44-L, 44-R with respect to the human body can be obtained in a state closer to the surface than the line. That is, since it is possible to prevent so-called line contact with the human body, the ventilation path group 44-L, 44-R using the flexible tube 42 is provided from the hip contact area 22 to each of the left and right thigh contact areas 24-L, Even if it is arranged so as to be hung on 24-R, it is possible to surely prevent the seated person from feeling uncomfortable and uncomfortable.

In this sheet stuffiness eliminating method, in addition to forming the ventilation path groups 44-L, 44-R by arranging a plurality of small-sized flexible tubes 42 in parallel, Each of the flexible tubes is formed as a form having only a single outlet 52. That is,
Since the distribution joint 48 can surely disperse and equalize the air, and by suppressing the share of the sitting load per flexible tube 42, the collapse of each flexible tube can be sufficiently reduced. According to this method, the ventilation performance in the entire arrangement area of the ventilation path groups 44-L, 44-R is
Certainly high.

Further, if the outlets 52 are displaced for each flexible tube 42 and distributed over the entire area where the air passage groups 44-L and 44-R are arranged, the arrangement of the air passage groups can be improved from this point as well. The air permeability in the entire area is reliably improved.

Further, according to the seat ventilation structure 10 of the present invention, the seat 15 which can appropriately perform the above-described stuffiness detection method and stuffiness elimination method can be easily formed without complicating the configuration. Can be secured.

Here, as shown in FIG. 8 and FIG.
In the embodiment of the present invention, the output values e ₁ and e ₂ of the detection electrodes 20-L and 20-R at the start of execution are set to the initial values e ₁₀ and e _20.
The first variation values e ₁₁ and e _{2 1} obtained by subtracting the initial value from the subsequent measurement value are used as the comparative output values before the seating detection, and the first variation values are further calculated from the subsequent output values of the detection electrodes. Second variation value e for each detection electrode after subtracting the value
₁₂ and e ₂₂ are set values to be compared with each other, that is, the seating determination value e, as comparison output values after seating detection.
_Th , and the stuffy upper limit e _MU and the stuffy lower limit e _ML are compared. However, the output value e _{1 of} the detection electrodes 20-L, 20-R,
The seating detection on the seat 15 or the human body-human body on the seat surface is also detected by detecting that e ₂ simply exceeds or reaches the seating determination value e _Th , the stuffiness upper limit value e _MU , and the stuffiness lower limit value e _ML. Since it is possible to detect stuffiness between contact portions, the output value of the detection electrode may be directly compared with each set value as a comparison output value.

However, as in the embodiment of the present invention, the first variation value e ₁₁ obtained by subtracting the initial values e ₁₀ and e ₂₀ from the output values e ₁ and e ₂ of the detection electrodes 20-L and 20-R. , e
_{If 21} is the comparison output value before the seating detection, and if the second variation values e ₁₂ and e ₂₂ of the detection electrodes obtained by subtracting the first variation value from the output value are the comparison output values after the sitting detection,
Since detection errors due to the influence of the physique of the seated occupant, the material of the clothes, the thickness, etc. can be reliably eliminated, that detection, that is, seating detection on the seat 15, or stuffiness detection between the human body on the seat surface and the human body contact area, etc. The certainty of is further improved.

Further, in this embodiment, the detection electrodes 20-L, 20-R are provided between the seat pad 28 and the wadding 32, and the air passage groups 44-L, 44-R are provided as the epidermis 30 and the wadding. However, it is sufficient if the ventilation path group is arranged above the detection electrode, and the invention is not limited to this.
For example, both the air passage group and the detection electrode are seat pads,
It may be configured so as to be interposed between the waddings or between the skins and the waddings.

However, in particular, if the detection electrodes 20-L and 20-R are interposed and arranged between the seat pad 28 and the wadding 32, the air will not be sent out through the wadding having poor air permeability, so It is possible to eliminate stuffiness by sending it out smoothly and surely.

In the embodiment of the present invention,
Although an automobile seat is illustrated as the seat, the present invention is not limited to this, and the present invention may be applied to various seats other than trains, airplanes, ships, etc., vehicles, and vehicles.

The above-described embodiments are for explaining the present invention, and are not intended to limit the present invention in any way, and all modifications and alterations made within the technical scope of the present invention are also included in this embodiment. Needless to say, it is included in the invention.

[0051]

As described above, according to the seat stuffiness detection method, the stuffiness elimination method, and the seat ventilation structure of the present invention, the detection electrodes are provided on the left and right thighs of the seat cushion from the hip contact area. Since they are spaced apart and juxtaposed over the partial contact area, the reliability of stuffiness detection between the human body and human body contact portions on the seat surface is improved even when the sitting posture changes. Since it suffices if the detection electrodes are arranged side by side on the left and right sides, it is possible to reliably prevent the configuration from becoming complicated.

Further, in the present invention, when the occurrence of stuffiness between the human body and the human body contact portion on the seat surface is detected and discriminated, the air is sent to the ventilation path group formed by juxtaposing a plurality of flexible tubes. -Because air is sent out between the human body contact portions, it is possible to reliably prevent deterioration of air permeability in the air passage group even when seated. Therefore, the certainty of the blown air is improved, and the stuffiness caused by the blown air is surely eliminated.

By arranging a plurality of flexible tubes side by side, the contact of the ventilation path group with respect to the human body can be obtained as a state closer to the surface than the line, and so-called line contact with the human body can be prevented, so that the flexibility can be improved. Even if the ventilation passage group using tubes is arranged so as to hang from the hip contact area to each of the left and right thigh contact areas, it is possible to reliably prevent the seated person from feeling uncomfortable and uncomfortable.

Further, in addition to the air passage group being formed by juxtaposing a plurality of flexible tubes, each of the plurality of flexible tubes is formed as a form having only a single outlet. Therefore, air can be reliably dispersed and equalized in the distribution joint, and the collapse of each flexible tube can be sufficiently reduced by suppressing the share of the sitting load per flexible tube. . Therefore, the ventilation performance in the entire area where the ventilation path group is arranged can be surely increased.

Further, if the outlets are displaced for each flexible tube, the air permeability in the entire area where the air passage groups are arranged is surely improved also from this point.

If the detection electrode is interposed and arranged between the seat pad and the wadding, air is not sent out through the wadding having poor air permeability, so that the stuffiness caused by sending out the air is smooth and reliable. It becomes possible.

Then, the output value of the detection electrode at the start of execution is recognized as an initial value, and the first variation value obtained by subtracting this initial value from the subsequent measured value is set as the comparative output value before seating detection, and further, The first from the output value of the detection electrode after that
By comparing the second variation value for each detection electrode after subtracting the variation value with the set value to be compared as the comparison output value after seating detection, the physique of the seated occupant, the material of the clothes, the thickness, etc. Since the detection error due to the influence of 1) can be reliably eliminated, the reliability of the detection, that is, the detection of seating on the seat or the stuffiness detection between the human body and the human body contact portion on the seat surface is further improved.

[Brief description of drawings]

FIG. 1 is a schematic circuit diagram of a ventilation structure for a seat according to the present invention.

FIG. 2 is a schematic perspective view of a seat.

FIG. 3 is a schematic plan view of a seat cushion.

FIG. 4 is a partially broken cross-sectional view taken along the line AA of FIG.

FIG. 5 is a schematic output diagram of a ventilation structure of a seat.

FIG. 6 is a partially broken cross-sectional view taken along the line BB of FIG.

FIG. 7 is a partially cutaway schematic perspective view of a ventilation path group.

FIG. 8 is a flowchart showing the operation of the ventilation structure of the seat.

[Explanation of symbols]

Ventilation structure of 10 seats 12 Murre detector 14 Blower 16 seat cushion 20-L, 20-R detection electrode 38 Comparison / discrimination means (CPU) 42 Flexible tube 44-L, 44-R Ventilation path group 46 Blower source (air pump) 52 Air outlet

Claims (9)

[Claims] 1. A method utilizing the principle of an electrostatic capacitance type proximity switch, which switches ON / OFF according to the electrostatic capacitance that changes depending on the proximity of a dielectric material. The changes in the capacitance of the left and right detection electrodes that are placed side by side over the thigh contact area are monitored as the output values of the detection electrodes, and the comparison output value based on this output value is used as at least the preset A method for detecting stuffiness in a sheet, which compares with the upper limit value and detects and determines occurrence of stuffiness between a human body and a human body contact portion on the sheet surface when the comparison output value of any of the detection electrodes reaches the stuffiness upper limit value. 2. A method utilizing the principle of an electrostatic capacitance type proximity switch, which switches ON / OFF according to the electrostatic capacitance that changes depending on the proximity of a dielectric material, and which uses the principle of an electrostatic capacitance type proximity switch. The change in the capacitance of the left and right sensing electrodes that are placed side by side over the thigh contact area is monitored as the output value of the sensing electrode, and the initial value of the output value is first recognized, and then the output of the sensing electrode is detected. The first variation value calculated by subtracting the initial value from the value is compared with a preset seating determination value as a comparison output value before seating detection, and the first variation value of any of the detection electrodes is used as the seating determination value. When crossed, it detects the occupant's seating on the seat,
Along with the determination, after the seating detection, the second fluctuation value calculated by subtracting the first fluctuation value from the output value of the detection electrode is compared with at least the preset stuffiness upper limit value as a comparison output value after the seating detection, A stuffiness detection method for a sheet, which detects and determines the occurrence of stuffiness between a human body and a human body contact portion on the sheet surface when the second variation value of any of the detection electrodes reaches the stuffiness upper limit value. 3. A method utilizing the principle of an electrostatic capacitance type proximity switch, which switches ON / OFF according to the electrostatic capacitance which changes depending on the proximity of a dielectric, and which is provided on the left and right sides of the seat cushion from the buttocks contact area. The changes in the capacitance of the left and right sensing electrodes that are placed side by side over the thigh contact area are monitored as the output values of the sensing electrodes, and the comparative output value based on this output value is used as the preset mullet. When the comparison output value of one of the detection electrodes reaches the upper limit value and the upper limit value, and the lower limit value of stuffiness is detected, at least in the same range as the detection electrodes, a plurality of flexible tubes juxtaposed above the detection electrodes are used. The air is sent to the group of air passages, and the single blow-out port provided for each flexible tube blows out the air between the human body and the human body contact part, and the air is blown out from the blow-out port. When the comparison output values of the detection electrode drops beyond the stuffiness lower limit, stuffiness resolution method of the sheet to stop the feeding of air into the air passage group. 4. A method utilizing the principle of an electrostatic capacitance type proximity switch, which switches ON / OFF according to the electrostatic capacitance that changes depending on the proximity of a dielectric, and which uses the principle of an electrostatic capacitance type proximity switch. The change in the capacitance of the left and right sensing electrodes that are placed side by side over the thigh contact area is monitored as the output value of the sensing electrode, and the initial value of the output value is first recognized, and then the output of the sensing electrode is detected. The first variation value calculated by subtracting the initial value from the value is compared with a preset seating determination value as a comparison output value before seating detection, and the first variation value of any of the detection electrodes is used as the seating determination value. When crossed, it detects the occupant's seating on the seat,
Along with the determination, after the seating detection, the second fluctuation value calculated by subtracting the first fluctuation value from the output value of the detection electrode is compared with at least the preset stuffiness upper limit value as a comparison output value after the seating detection, When the second fluctuation value of any of the detection electrodes reaches this stuffiness upper limit value, air is sent to a ventilation path group composed of a plurality of flexible tubes juxtaposed above the detection electrodes at least in an area equivalent to the detection electrodes. A single blow-out port provided for each flexible tube blows air between the human body and a human body contact portion, and the second fluctuation value of both detection electrodes is stuffed with the blow-out of air from the blow-out port. A method for eliminating stuffiness in a seat that stops sending air into the ventilation passages when the temperature falls below the lower limit. 5. The left and right detection electrodes of the seat cushion, which are arranged side by side from the hip contact area to the left and right thigh contact areas, respectively, and the output values from the respective detection electrodes. Compare the comparison output value with the preset value,
A stuffiness detection device utilizing the principle of a capacitance type proximity switch, comprising a comparison / discrimination means for outputting an output signal in accordance therewith; and a plurality of movable elements arranged in parallel above the detection electrodes at least in the same area as the detection electrodes. A left and right ventilation path group consisting of flexible tubes and an air blowing source for sending air to this ventilation path group are provided, and a single blowout provided for each flexible tube under the air blowing from the air blowing source. A blower formed so that air can be blown out from the mouth between the human body and the human body contact part; and the stuffiness detection device compares the comparison output value of the detection electrode with a predetermined set value, and the sheet Human body on the surface-When detecting and determining the occurrence of stuffiness between human body contact parts, by the operation control of the blower by the stuffiness detection device,
Ventilation structure of the seat that allows air to be sent out between the human body and human body contact areas. 6. The stuffiness detecting device uses the principle of a capacitance type proximity switch that switches ON / OFF by a capacitance that changes depending on the approach of a dielectric, and the capacitance of each detection electrode. The change is monitored as the output value of the detection electrode, the comparison output value based on this output value is compared with the preset stuffiness upper limit value and stuffiness lower limit value, and the comparison output value of one of the detection electrodes When the upper limit value of stuffiness is reached, air is blown into the ventilation channel group by the operation of the air blower, and when the comparative output value of both detection electrodes falls below the lower limit value of stuffiness, the ventilation channel is stopped The ventilation structure for a seat according to claim 5, wherein the sending of air into the group is stopped. 7. The stuffiness detection device uses the principle of a capacitance type proximity switch that switches ON / OFF by a capacitance that changes depending on the proximity of a dielectric, and the capacitance of each detection electrode. The change is monitored as the output value of the detection electrode, the initial value of the output value is first recognized, and then the first variation value calculated by subtracting the initial value from the output value of the detection electrode is compared with that before the seating detection. The output value is compared with a preset seating judgment value, and when the first fluctuation value of any of the detection electrodes exceeds the seating judgment value, the seating of the occupant on the seat is detected and determined, and the seating detection is performed. After that, the second variation value calculated by subtracting the first variation value from the output value of the detection electrode is compared with at least the preset upper limit value of stuffiness as a comparison output value after the seating detection, and the second variation value of any one of the detection electrodes is detected. The second fluctuation value is this stuffy upper limit When air reaches the air passage group, the air is blown into the air passage group by the operation of the air blower, and when the second fluctuation value of both detection electrodes falls below the stuffiness lower limit value, the air blower is stopped due to the operation stop of the air blower. The ventilation structure for a seat according to claim 5, wherein the feeding of air is stopped. 8. The ventilation structure for a seat according to claim 5, wherein the ventilation passage group is interposed between a wadding and an outer skin forming a trim cover arranged on a surface layer of the seat cushion. 9. The sheet according to claim 5, wherein a single outlet is provided for each flexible tube forming the ventilation path group, and the outlets are provided so as to be shifted for each flexible tube. Ventilation structure.