JP2020164133A - Seat - Google Patents

Abstract

To provide a seat which can change its form to an optimal form in accordance with a sitting state.SOLUTION: A seat 10 analyzes an aspect of a sitting posture of an occupant P and changes an inclination of a seat cushion 11 on the basis of the analysis result. Therefore, a form of the seat 10 can be changed to an optimal form on the basis of a sitting state. In addition, by changing the form of the seat 10, it can reduce pains and fatigue of the occupant P. Furthermore, by changing the form of the seat 10, it is capable of making the occupant P assume a stable sitting posture and appropriately receive protection when an occupant protection device such as an air bag operates in a vehicle collision.SELECTED DRAWING: Figure 7

Description

The present invention relates to seats, especially seats provided in vehicles.

When a seat of a vehicle or the like is seated for a long time, distortion is concentrated on a specific part of the seated occupant, and fatigue is likely to occur. Therefore, a vehicle seat device has been proposed in which a reference spinal column shape that reduces the load is set in advance and the support surface of the seat back is controlled so as to have this standard spinal column shape (see Patent Document 1).
Here, in general, an S-shaped sitting posture with a slightly extended back muscle is considered to be an ideal shape. Therefore, the conventional device operates so as to correct the posture of the occupant to this ideal S-shaped sitting posture.

Further, especially in the case of a vehicle seat, an airbag or other occupant protection device is activated for an occupant seated in the seat in the event of a vehicle collision. Therefore, from the viewpoint of appropriate protection for the occupant, the seat seat It is desirable that the occupants are seated in a stable manner.

Japanese Patent Application Laid-Open No. 8-308679

However, in elderly people and fat people (obese body shape), the sitting posture may be a C-shape with a rounded back muscle. In this way, the occupants who sit on the seats have various body shapes and postures, and also have various habits when sitting. For this reason, the occupants have different sitting modes, such as sitting shallowly or deeply with respect to the seating surface of the seat. Here, for example, if a person whose sitting posture is C-shaped is forcibly corrected to an S-shaped sitting posture, the load may increase, which is more than the S-shaped sitting posture. In some cases, the load may be reduced by taking a predetermined sitting posture. Therefore, in some cases, there is a possibility that pain and tiredness may be increased by controlling the posture so as to be a preset ideal posture as in the conventional case. In addition, even though the sitting posture is C-shaped, the state is different between the C-shaped shape with a bent waist like an old man and the simple leaning posture (the state where the upper body remains behind). , I couldn't respond according to my posture.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a seat seat that can be changed into an optimum seat seat form according to a seated state.

The seat according to the present invention is a seat of a vehicle provided with a seat cushion that supports the buttocks of the occupant and a seat back that supports the back of the occupant. The seat cushion control means includes a seat cushion control means for variably controlling the inclination of the seat cushion, and the seat cushion control means is based on the analysis result by the seat cushion analysis means. It is characterized in that the inclination of is variable.

Further, in the seat seat according to the present invention, when the seat cushion control means is determined by the seating posture analysis means that the seating posture is not an appropriate seating posture, the inclination of the seat cushion may be changed.

Further, in the seat seat according to the present invention, the seat cushion can be tilted backward by the seat cushion control means by lowering the rear portion of the seat surface of the seat cushion or raising the front portion of the seat surface of the seat cushion. You may let it.

Further, in the seat according to the present invention, when the seating posture analysis means detects that the position of the buttocks of the occupant is an appropriate position and the center of gravity of the occupant is detected to be in front of the appropriate position. , It may be determined that the first special posture is not an appropriate sitting posture.

Further, in the seat seat according to the present invention, when the seat cushion control means determines by the seating posture analysis means that the seating posture of the occupant is the first special posture, the seat cushion is lowered backward. It may be changed to the inclination.

Further, in the seat according to the present invention, the seating posture analysis means detects that the position of the buttocks of the occupant is in front of the appropriate position, and the center of gravity of the occupant is in the appropriate position or in front of the appropriate position. If it is detected, it may be determined that the second special posture is not an appropriate sitting posture.

Further, the seat according to the present invention has a seat back control means for variably controlling the inclination of the seat back, and the seating posture analysis means indicates that the seating posture of the occupant is the second special posture. If it is determined, the seat cushion control means may change the seat cushion to a backward downward inclination, and the seat back control means may raise the inclination of the seat back forward.

According to the present invention, it is possible to provide a seat seat that can be changed into an optimum seat seat form according to a seated state.

It is sectional drawing which shows the outline of a part of the vehicle which provided the seat in embodiment of this invention. It is a schematic block diagram of a seat in an embodiment of the present invention. It is a figure which shows an example of the cushion pressure sensor provided in the seat cushion. It is a figure which shows an example of the cushion shape changing device provided in a seat. It is a vertical cross-sectional view which shows an example of the seat back provided with the back shape changing apparatus. It is a figure which shows the sitting posture of the occupant in a seat. It is a flowchart which shows the operation outline of the control part in a seat. It is a figure which shows the operation when the seating posture of an occupant is a 1st C-shape. It is a figure which shows the operation when the seating posture of an occupant is a 2nd C-shape.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an outline of a part of a vehicle provided with a seat according to an embodiment of the present invention. Further, FIG. 2 is a schematic block diagram of a seat in the embodiment of the present invention.

(Structure of vehicle 1)
As shown in FIG. 1, the passenger compartment of the vehicle 1 is provided with an underfloor 3 at the lower part and a roof 4 at the upper part. Further, a seat 10 is provided on the underfloor 3.

(Seat 10)
The seat 10 is seated by the occupant P who is in the vehicle 1. Further, the seat seat 10 includes a seat cushion 11 (seat portion) that supports the thigh from the buttocks of the occupant P, a seat back 12 (backrest portion) that is reclining and supports the back of the occupant P, and an occupant. It is provided with a headrest 13 (head portion) that supports the head of P.
Further, the seat seat 10 includes a pressure detecting unit 100, a seat shape changing device 200, and a control unit 300.

In the seat seat 10, the seat cushion 11 and the seat back 12 are connected to each other. Further, the headrest 13 is detachably attached to the seat back 12.
Further, as will be described later, in the seat cushion 11, the inclination of the seat surface portion on which the occupant P is seated can be changed. Further, the seat back 12 can change the inclination and unevenness of the backrest portion with which the back of the occupant P abuts.

Further, in the present embodiment, the control unit 300 determines the sitting posture of the occupant P based on the information detected by the pressure detection unit 100, but the vehicle-mounted camera 60 is inside the vehicle 1. , And the image taken by the in-vehicle camera 60 may be used. That is, the vehicle-mounted camera 60 photographs the occupant P seated on the seat 10. Then, the control unit 300 determines the sitting posture of the occupant P based on the posture of the occupant P photographed by the vehicle-mounted camera 60. In this case, the in-vehicle camera 60 functions as a photographing means for photographing the occupant P seated on the seat 10.

(Pressure detector 100)
The pressure detection unit 100 detects the pressure from the occupant P on the seat cushion 11 and the seat back 12. Therefore, the pressure detecting unit 100 can detect the center of gravity of the occupant P (pressure detecting means) by detecting the pressure from the occupant P on the seat cushion 11 and the seat back 12.
Further, the pressure detection unit 100 includes a cushion pressure sensor 110 and a back pressure sensor 120.

(Cushion pressure sensor 110)
FIG. 3 is a diagram showing an example of a cushion pressure sensor 110 provided on the seat cushion 11. In FIG. 3A, the left direction of the paper surface indicates the front direction of the seat seat 10, and the upward direction of the paper surface indicates the upward direction of the seat seat 10. Further, in FIGS. 3 (b), 3 (c), and 3 (d), the left direction of the paper surface indicates the front direction of the seat seat 10, and the upward direction of the paper surface indicates the right direction of the seat seat 10.

As shown in FIG. 3B, the cushion pressure sensor 110 is composed of a plurality of pressure sensors provided in the lower portion near the seat surface of the seat cushion 11. Further, the cushion pressure sensor 110 detects the pressure from the upper surface (seat surface) with respect to the seat cushion 11 by a plurality of pressure sensors. As the pressure sensor, one using a piezoelectric element, a strain gauge type force sensor, or the like can be used.

The cushion pressure sensor 110 can detect the position of the buttocks of the occupant P supported by the seat cushion 11 based on the respective detection values of the pressure sensor. Therefore, the cushion pressure sensor 110 functions as a seating position detecting means.
As shown in FIG. 3 (c), the cushion pressure sensor 110 may use a strain sensor on the entire seat surface of the seat cushion 11, or as shown in FIG. 3 (d). Load meters may be provided on all four sides of the seat surface of the seat cushion 11.

(Back pressure sensor 120)
The back pressure sensor 120 is composed of a plurality of pressure sensors provided on the front surface of the seat back 12 and in the lower portion near the backrest portion where the back of the occupant P hits. Further, the back pressure sensor 120, like the cushion pressure sensor 110, detects the pressure from the front surface (backrest surface) with respect to the seat back 12 by a plurality of pressure sensors.

The back pressure sensor 120 can detect the contact area on the back of the occupant P supported by the seat back 12 based on the respective detection values of the pressure sensor. Therefore, the back pressure sensor 120 functions as a contact area detecting means.

(Sheet shape changing device 200)
The seat shape changing device 200 changes the inclination, unevenness, and the like of the seat cushion 11 and the seat back 12.
Further, the seat shape changing device 200 includes a cushion shape changing device 210 and a back shape changing device 220.

(Cushion shape changing device 210)
The cushion shape changing device 210 changes the inclination of the seat cushion 11. For example, the cushion shape changing device 210 moves the seat cushion 11 up and down at the rear portion of the seat surface (rear side with respect to the traveling direction of the vehicle 1) and the seat surface front portion of the seat cushion 11 (relative to the traveling direction of the vehicle 1). The front side) can be moved up and down.

FIG. 4 is a diagram showing an example of the cushion shape changing device 210 provided in the seat seat 10.
As shown in FIG. 4, the cushion shape changing device 210 includes an actuator that moves the rear portion of the seat surface of the seat cushion 11 up and down, and an actuator that moves the front portion of the seat surface of the seat cushion 11 up and down.

Therefore, the cushion shape changing device 210 can incline the seat cushion 11 downward by lowering the rear portion of the seat surface of the seat cushion 11. Further, the cushion shape changing device 210 can also raise the front portion of the seat surface of the seat cushion 11 so that the seat cushion 11 is tilted backward. Further, the cushion shape changing device 210 can tilt the seat cushion 11 downward by raising the rear portion of the seat surface of the seat cushion 11 or lowering the front portion of the seat surface of the seat cushion 11.

The cushion shape changing device 210 may raise or lower both the rear portion of the seat surface and the front portion of the seat surface of the seat cushion 11 to incline the seat cushion 11. However, even when the seat cushion 11 is tilted backward in the same manner, the seat surface of the seat cushion 11 depends on whether the rear portion of the seat surface of the seat cushion 11 is lowered or the front portion of the seat surface of the seat cushion 11 is raised. The height of the rear part etc. will be different. The same applies to the case of falling forward.

Therefore, in the case of the seat 10 provided with the driver's seat, the height of the front part of the seat surface of the seat cushion 11 should not change because the occupant P operates the operation pedals such as the accelerator and the brake. Therefore, it is desirable that the cushion shape changing device 210 changes the inclination of the seat surface by adjusting the height of the rear portion of the seat surface without changing the height of the front portion of the seat surface of the seat cushion 11. Further, even if the seat 10 is provided other than the driver's seat, it is better that the feet of the occupant P do not separate from the floor (underfloor 3). Therefore, similarly, only adjusting the height of the rear part of the seat surface It is desirable to change the inclination of the seat surface.

Further, in the present embodiment, only the front-rear inclination of the seat surface of the seat cushion 11 can be changed, but the present invention is not limited to this, and the left-right inclination and the like may be changed. Further, the cushion shape changing device 210 is supposed to change the inclination of the seat surface of the seat cushion 11 by an actuator, but the present invention is not limited to this, and is provided with a closed airbag-like device to move gas in and out to seat. It may change the inclination of the surface. Further, a plate-shaped member having a support shaft or the like may be provided in the central portion, and the inclination of the seat surface may be directly changed by a motor or the like.

(Back shape changing device 220)
The back shape changing device 220 changes the inclination of the seat back 12. Further, the back shape changing device 220 may change the unevenness of the seat back 12. For example, the back shape changing device 220 can change the cross-sectional shape of the seat back 12 parallel to the width direction of the seat seat 10.
Further, the back shape changing device 220 may be capable of changing the vertical cross-sectional shape of the seat back 12 with respect to the vertical direction of the seat seat 10. Specifically, the back shape changing device 220 can change the vertical cross-sectional shape of the seat back 12 by changing the position, shape, height, etc. of the convex shape of the seat back 12 toward the occupant side. .. Further, the back shape changing device 220 can change the vertical cross-sectional shape of the seat back 12 by inclining the lower part of the seat back 12 forward from a predetermined position and inclining the upper part rearward from the predetermined position. It may be. At this time, the back shape changing device 220 lowers the seat back 12 in conjunction with the lowering of the rear portion of the seat surface of the seat cushion 11.

FIG. 5 is a vertical cross-sectional view showing an example of the seat back 12 provided with the back shape changing device 220.

As shown in FIG. 5, the back shape changing device 220 includes a back tilting device 223 and a back tilting member 224.
The back tilting device 223 is controlled by the control unit 300 to change the angle of the back tilting member 224 and change the tilting angle of the seat back 12. The back tilting device 223 may have the same function as the reclining device of the seat 10 and may be shared, but it is desirable that the back tilting device 223 is different from the reclining device.

The back tilting member 224 is integrated with the seat back 12, and is driven by the back tilting device 223 to change the tilt angle of the seat back 12.
In this way, the back shape changing device 220 can change the inclination of the seat back 12.

(Control unit 300)
The control unit 300 is for controlling the operation of the seat 10. The control unit 300 may also be used as an ECU that controls the entire vehicle 1. Further, the control unit 300 temporarily includes a CPU (Central Processing Unit) as a central processing unit, a control program executed by the CPU, a data table, a ROM (Read Only Memory) for storing each command and data, and the like. Equipped with a RAM (Random Access Memory) for storing data, an EEPROM (Electrically Erasable and Programmable Read Only Memory) consisting of a rewritable non-volatile memory, and an input / output interface circuit to control the operation of the seat 10. It has become.
It should be noted that the ROM stores a predetermined appropriate sitting posture data and a predetermined sitting posture data determined to be inappropriate.

Further, the control unit 300 analyzes the sitting posture of the occupant P based on the information of the pressure detection unit 100 and the like, controls the seat shape changing device 200, and controls the shape and shape of the seat cushion 11 and the seat back 12. Is variable.

Specifically, the control unit 300 analyzes and determines the sitting posture of the occupant P based on the position of the buttocks of the occupant P detected by the pressure detection unit 100 and the center of gravity of the occupant P, and determines the occupant. It is determined whether or not the mode of the sitting posture of P is an appropriate predetermined sitting posture. Therefore, the control unit 300 functions as a sitting posture analysis means and an appropriate sitting posture determination means.

Further, the control unit 300 determines the sitting posture of the occupant P based on the position of the buttocks of the occupant P detected by the pressure detection unit 100 and the contact area of the back of the occupant P supported by the seat back 12. The mode is determined, and it is determined whether or not the determined seating posture of the occupant P is an appropriate predetermined sitting posture. Therefore, the control unit 300 functions as an appropriate sitting posture determining means.

Further, the control unit 300 determines that the seating posture is not appropriate when the position of the buttocks of the occupant P is an appropriate position and the center of gravity of the occupant P is in front of the appropriate position. Further, the control unit 300 determines that the sitting posture is not appropriate when the position of the buttocks of the occupant P is ahead of the appropriate position and the center of gravity of the occupant P is in the appropriate position or in front of the appropriate position. ..

Further, the control unit 300 variably controls the inclination of the seat cushion 11 when it is determined that the seating posture is not appropriate. Further, the control unit 300 variably controls the inclination of the seat back 12 as well as the seat cushion 11 depending on the sitting posture. Therefore, the control unit 300 functions as a seat cushion control means. Further, the control unit 300 functions as a seat back control means.

Here, the sitting posture of the occupant P in the seat 10 will be described.
FIG. 6 is a diagram showing a sitting posture of the occupant P on the seat 10.

First, the ideal sitting posture of the occupant P will be described.
FIG. 6A is a diagram showing an ideal sitting posture of the occupant P on the seat 10.

As shown in FIG. 6A, the ideal sitting posture is a state in which the seat cushion 11 is deeply seated, the back muscles are stretched, and the back is attached to the seat back 12. In addition, even if the top of the steering wheel (steering wheel) is held, both elbows cannot be fully extended. Further, the position of the head is a front position slightly away from the headrest 13 (about three fingers can be inserted).

In such an ideal sitting posture, the line L1 of the spine of the occupant P has a gentle S-shape. Then, in the seat back 12, pressure is applied from the occupant P at the upper position near the shoulder of the occupant P and the lower position near the buttocks. Further, in the seat cushion 11, since the occupant P is seated at the rear, the center of gravity is at the rear, and the pressure becomes higher at the rear.

Next, a case where the spine line has a C shape will be described.
FIG. 6B is a diagram in which the seating posture of the occupant P on the seat 10 is the first C-shape.

As shown in FIG. 6B, in the case of an elderly person, a fat person (obese body shape), or a person with a bad posture, the sitting posture may be the first C-shape. In this first C-shaped sitting posture, the seat is seated in front of the seat cushion 11 rather than the ideal sitting posture, the back is curled up, and the head is in a front position considerably away from the headrest 13.

In such a first C-shaped sitting posture, the line L2 of the spine of the occupant P has a C-shape. Then, in the seat back 12, pressure is applied from the occupant P at one point slightly below the center. Further, in the seat cushion 11, the center of gravity is in front of the ideal sitting posture, there is no pressure in the rear, and the pressure in the center or in the front is high.

Next, a case where the spine line has a second C-shape will be described.
FIG. 6C is a diagram in which the seating posture of the occupant P on the seat 10 has a second C-shape.

As shown in FIG. 6C, the second C-shape may be different from the first C-shape. In this second C-shaped sitting posture, the seat cushion 11 is seated further in front of the seat cushion 11 than in the first C-shaped sitting posture, and the upper body is tilted backward. In addition, since the upper body is tilted backward, the elbow holding the steering wheel may be fully extended.

In such a second C-shaped sitting posture, the line L3 of the spine of the occupant P has a C-shape. Then, in the seat back 12, pressure is applied further downward from the occupant P than in the case of the first C-shape. Further, in the seat cushion 11, the position where the pressure is applied is forward as compared with the case of the first C-shape, but the center of gravity is higher than that in the case of the first C-shape because the upper body is tilted backward. Behind.

(Operation of the control unit 300 on the seat 10)
Next, the operation of the control unit 300 in such a seat 10 will be described.
FIG. 7 is a flowchart showing an outline of the operation of the control unit 300 on the seat 10.

In the seat 10, when the vehicle 1 is activated (the ignition key is turned on), the control unit 300 determines whether or not the occupant P is seated (step S11). For example, the control unit 300 can determine whether or not the detected value detected by the cushion pressure sensor 110 is equal to or greater than a predetermined value, and if it is equal to or greater than a predetermined value, it can be determined that the cushion pressure sensor 110 is in a seated state. It should be noted that not only the detected value detected by the cushion pressure sensor 110 but also the detected value detected by the back pressure sensor 120 may be taken into consideration to comprehensively determine whether or not the occupant P is seated. ..

Then, when it is determined that the occupant P is not seated (NO in step S11), the control unit 300 repeats the determination of whether or not the occupant P is seated until it is determined that the occupant P is seated.
On the other hand, when it is determined that the occupant P is seated (YES in step S11), the control unit 300 resets the counter T (step S12). This counter T is incremented by a timer interrupt process generated every second by the timer.

Next, the control unit 300 determines whether or not the counter T has reached 300 (seconds) or more (step S13). That is, the control unit 300 determines whether or not 5 minutes or more have passed since the occupant P was seated.
Then, when the control unit 300 determines that the counter T is not 300 (seconds) or more (NO in step S13), the control unit 300 repeats this determination until the counter T becomes 300 (seconds) or more.

On the other hand, when the control unit 300 determines that the counter T has reached 300 (seconds) or more (YES in step S13), the control unit 300 performs a sitting posture information acquisition process (step S14). Here, the control unit 300 acquires information on the position of the buttocks of the occupant P and information on the position of the center of gravity of the occupant P.

Specifically, the control unit 300 acquires the detected values from the cushion pressure sensor 110 and the back pressure sensor 120, respectively. Then, the control unit 300 calculates the position of the buttocks of the occupant P from each detected value acquired from the cushion pressure sensor 110. Further, the control unit 300 calculates the position of the center of gravity of the occupant P from each detected value acquired from the cushion pressure sensor 110 and the back pressure sensor 120.

The control unit 300 may acquire the contact area of the back of the occupant P with respect to the seat back 12 instead of the information on the position of the center of gravity of the occupant P. In this case, the control unit 300 acquires each detected value from the back pressure sensor 120, and calculates the contact area on the back of the occupant P from each detected value acquired from the back pressure sensor 120.

Next, the control unit 300 determines the mode of the sitting posture of the occupant P (step S15). Here, the control unit 300 determines the mode of the sitting posture of the occupant P from the acquired sitting posture information. Thereby, the mode of the sitting posture of the occupant P is determined, such as whether the seating posture of the occupant P is an ideal S-shape with the back muscles slightly extended or a C-shape with the back muscles curled up.

For example, the control unit 300 determines that the seating posture is an ideal S-shape if the information on the position of the buttocks of the occupant P is the rear position and the position of the center of gravity of the occupant P is the rear position. .. Further, the control unit 300 determines that the seating posture is the first C-shape if the information on the position of the buttocks of the occupant P is the central position and the position of the center of gravity of the occupant P is also the center. .. Further, the control unit 300 is in a sitting posture in which the occupant P has a second C-shape when the information on the position of the buttocks of the occupant P is the center or the front position and the position of the center of gravity of the occupant P is the rear. decide.

It should be noted that the process of determining the sitting posture of the occupant P and the process of acquiring the previous sitting posture information naturally correspond to the "appropriate sitting posture" determination method of the next processing. The mode of the above and the sitting posture information will be acquired.

In addition, the shape of the seat cushion 11 can be changed in more detail and accurately depending on how the seating posture of the occupant P is determined. For example, in addition to the position of the buttocks and the position of the center of gravity of the occupant P, information such as a position where pressure is strongly applied to the seat back 12 and whether or not the position where pressure is applied is concentrated at a predetermined position is obtained. As a result, the seating posture of the occupant P is C-shaped, and it is possible to detect where the seat back 12 is supported, and the seat cushion 11 and the seat back 12 can be adjusted in more detail.

Next, the control unit 300 determines whether or not the sitting posture of the occupant P is an appropriate sitting posture (step S16). That is, the control unit 300 determines whether or not the mode of the seating posture of the occupant P determined in the above process corresponds to a predetermined appropriate sitting posture, and also determines the predetermined inappropriate sitting posture. Judge whether it is applicable or not.
For example, the control unit 300 determines that the seating posture is not appropriate when the position of the buttocks of the occupant P is an appropriate position and the center of gravity of the occupant P is in front of the appropriate position. To do. Further, the control unit 300 is appropriate when the position of the buttocks of the occupant P is in front of the appropriate position and the center of gravity of the occupant P is in the appropriate position or in front of the appropriate position in a sitting posture. Judge that it is not a sitting posture.

When the control unit 300 determines that the seating posture of the occupant P is an appropriate sitting posture (YES in step S16), the control unit 300 shifts to the timer determination process in step S19.
On the other hand, when the control unit 300 determines that the seating posture of the occupant P is not an appropriate sitting posture (NO in step S16), the sitting posture of the occupant P has a second C-shaped shape. However, it is determined (step S17). That is, the control unit 300 determines whether or not the mode of the seating posture of the occupant P determined in the above process is the second C-shape.

When the control unit 300 determines that the seating posture of the occupant P is the second C-shape (YES in step S17), the control unit 300 proceeds to step S21 and is not in the second C-shape. If it is determined (NO in step S17), the process proceeds to step S18.

When the control unit 300 determines that the seating posture of the occupant P is not the second C-shape (NO in step S17), the control unit 300 changes the shape of the seat cushion 11 for the first C-shape. (Step S18). In the present embodiment, if the seating posture of the occupant P is not appropriate and it is not the second C-shape, it is determined that the occupant P has the first C-shape. Here, the control unit 300 performs a process of changing the inclination of the seat cushion 11.

Specifically, the control unit 300 performs a process of lowering the rear portion of the seat surface of the seat cushion 11 by the cushion shape changing device 210 based on the determined mode of the seating posture of the occupant P. More specifically, the control unit 300 drains oil from the actuator corresponding to the rear portion of the seat surface to lower the rear portion of the seat surface of the seat cushion 11 and lower the seat surface of the seat cushion 11 to the rear.

Here, the operation when the seating posture of the occupant P is the first C-shape will be specifically described.
FIG. 8 is a diagram showing an operation when the seating posture of the occupant P is the first C-shape.

When the control unit 300 detects, for example, that the position of the buttocks of the occupant P is at an appropriate position and the center of gravity of the occupant P is in front of the appropriate position, the seating posture of the occupant P is the first C-shape. Judge that there is. In this way, when the seating posture of the occupant P is the first C-shape, as shown in FIG. 8A, the back of the occupant P is rounded, the distance to the steering wheel is short, and the arms are contracted. ..

Therefore, as shown in FIG. 8B, the control unit 300 lowers the rear of the seat cushion 11 so that the seat cushion 11 is tilted backward. As a result, the upper body of the occupant P can be raised and the distance to the steering wheel can be secured. From the first C-shaped posture, the contracted arm is extended and the posture suitable for driving operation with less fatigue. Can be made to.

Next, the control unit 300 determines whether or not the counter T has reached 1800 (seconds) or more (step S19). That is, the control unit 300 determines whether or not 30 minutes or more have passed since the occupant P was seated. After the first 30 minutes have passed, the progress is determined every 30 minutes.
Then, when the control unit 300 determines that the counter T is not 1800 (seconds) or more (NO in step S19), the control unit 300 repeats this determination until the counter T becomes 1800 (seconds) or more. On the other hand, when the control unit 300 determines that the counter T has reached 1800 (seconds) or more (YES in step S19), the control unit 300 proceeds to step S20.

Further, when the control unit 300 determines that the counter T has reached 1800 (seconds) or more (YES in step S19), the control unit 300 resets the counter T (step S20). Then, when the counter T is reset after 30 minutes have elapsed, the control unit 300 returns to the seating posture information acquisition process in step S14 and repeats the above process. Therefore, the seating posture of the occupant P can be determined every 30 minutes, and if the sitting posture is not appropriate, the form of the seat 10 can be changed.

On the other hand, when the control unit 300 determines in step S17 that the seating posture of the occupant P is the second C-shape (YES in step S17), first, for the second C-shape. The form of the seat cushion 11 is changed (step S21).

Specifically, the control unit 300 performs a process of lowering the rear portion of the seat surface of the seat cushion 11 by the cushion shape changing device 210 based on the second C-shaped seating posture. More specifically, the control unit 300 lowers the rear portion of the seat surface of the seat cushion 11 and lowers the seat surface of the seat cushion 11 rearward.

Next, the control unit 300 performs a shape change process of the seat back 12 for the second C shape (step S22).
Specifically, the control unit 300 causes the back shape changing device 220 to change the shape of the seat back 12 based on the sitting posture of the second C shape. For example, the control unit 300 controls the back shape changing device 220 to raise the seat back 12 forward.

Here, the operation when the seating posture of the occupant P is the second C-shape will be specifically described.
FIG. 9 is a diagram showing an operation when the seating posture of the occupant P is the second C-shape.

When the control unit 300 detects, for example, that the position of the buttocks of the occupant P is ahead of the appropriate position and the center of gravity of the occupant P is in the appropriate position or in front of the appropriate position, the seating posture of the occupant P is the first. It is determined that the shape is 2 C-shaped.

When the seating posture of the occupant P is the second C-shape, the occupant P and the steering wheel are separated from each other, and the arms are extended. Therefore, when the control unit 300 determines that the seating posture of the occupant P is the second C-shape, the seat cushion 11 is lowered backward and the seat back 12 is raised forward so as to be above the occupant P. The body can be raised and the posture can be adjusted to be suitable for driving with the elbows bent appropriately.

In the present embodiment, the seating posture of the occupant P is corrected by changing the inclination of the seat cushion 11, but the present invention is not limited to this, and the unevenness of the seat surface of the seat cushion 11 is changed. By changing the form of the seat cushion 11, the sitting posture of the occupant P may be corrected.

As described above, the seat 10 in the present embodiment analyzes the seating posture of the occupant P and changes the inclination of the seat cushion 11 based on the analysis result. Therefore, the optimum seat seat according to the seated state. It can be changed into 10 forms. Further, by changing the form of the seat 10, the pain and fatigue of the occupant P can be reduced. Further, by changing the form of the seat 10, the occupant P can take a stable sitting posture, and the occupant protection device such as an airbag generated in the event of a vehicle collision can be appropriately operated. Can be protected.

In the present embodiment, the first C-shape constitutes the first special posture of the present application, and the second C-shape constitutes the second special posture of the present application.

1 vehicle, 3 underfloor, 4 roof, 10 seat seat, 11 seat cushion, 12 seat back, 13 headrest, 60 in-vehicle camera, 100 pressure detector, 110 cushion pressure sensor, 120 back pressure sensor, 200 seat shape changer, 210 Cushion shape changing device, 220 Back shape changing device, 223 Back tilting device, 224 Back tilting member, 300 Control unit

Claims (7)

A seat cushion that supports the buttocks of the occupant,
A seat back that supports the occupant's back and
In the seat of a vehicle equipped with
A seating posture analysis means for analyzing the sitting posture of an occupant seated on a seat, and
A seat cushion control means that variably controls the inclination of the seat cushion,
Have,
The seat cushion control means is
The inclination of the seat cushion is changed based on the analysis result by the sitting posture analysis means.
A seat that features that. The seat cushion control means is
When the seating posture analysis means determines that the seating posture is not appropriate, the inclination of the seat cushion is changed.
The seat according to claim 1. The seat cushion control means is
By lowering the rear portion of the seat surface of the seat cushion or raising the front portion of the seat surface of the seat cushion, the seat cushion can be changed to a downwardly downward inclination.
The seat according to claim 1 or 2. The sitting posture analysis means
When it is detected that the position of the buttocks of the occupant is an appropriate position and the center of gravity of the occupant is detected to be in front of the appropriate position, it is determined that the first special posture is not an appropriate sitting posture.
The seat according to any one of claims 1 to 3, wherein the seat is characterized in that. The seat cushion control means is
When the seating posture analysis means determines that the seating posture of the occupant is the first special posture, the seat cushion is changed to a backward downward inclination.
The seat according to claim 4. The sitting posture analysis means
When it is detected that the position of the buttocks of the occupant is in front of the appropriate position and the center of gravity of the occupant is detected in the appropriate position or in front of the appropriate position, the second special posture which is not the appropriate sitting posture is obtained. Judge,
The seat according to any one of claims 1 to 5, characterized in that. A seatback control means that variably controls the inclination of the seatback,
Have,
When the seating posture analysis means determines that the seating posture of the occupant is the second special posture,
The seat cushion control means changes the seat cushion so as to tilt backward.
The seat back control means raises the inclination of the seat back forward.
The seat according to claim 6.