JP2022154161A - Seat hardness adjustment system and seat hardness adjustment method - Google Patents

Abstract

To provide a vehicle seat hardness adjustment system capable of automatically adjusting the seat hardness on the basis of the seat hardness previously set by a user.SOLUTION: A vehicle seat hardness adjustment system includes a seat hardness adjustment mechanism that adjusts the hardness of a seat mounted on a vehicle, and a control unit that controls the seat hardness adjustment mechanism. The vehicle seat hardness adjustment system further includes a storage unit that stores the seat hardness previously set by a user in association with identification information on the user. The control unit sets a target seat hardness on the basis of the seat hardness associated with the identification information input by the user, and controls the seat hardness adjustment mechanism.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle seat hardness adjustment system and a seat hardness adjustment method.

Patent Literature 1 discloses a vehicle capable of adjusting seat hardness.

JP 2020-157944 A

In the case of a vehicle owned by a user (for example, a driver), once the seat hardness is set, the user does not need to set the seat hardness every time the vehicle is driven.
On the other hand, in the case of a vehicle that is not owned by the user, such as a rental car or a shared car, there is a problem that the seat hardness needs to be set each time the user drives the vehicle.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a vehicle seat hardness adjustment system capable of automatically adjusting the seat hardness based on the seat hardness previously set by the user.

A seat hardness adjustment system according to one aspect of the present invention includes:
A seat hardness adjustment mechanism that adjusts the hardness of the seat mounted on the vehicle,
A seat hardness adjustment system for a vehicle, comprising a control unit that controls the seat hardness adjustment mechanism,
further comprising a storage unit that stores the seat hardness previously set by the user in association with the identification information of the user;
The control unit sets a target seat hardness based on the seat hardness associated with the identification information input by the user, and controls the seat hardness adjustment mechanism.

A seat hardness adjustment system according to an aspect of the present invention includes a storage unit that stores a seat hardness previously set by a user in association with identification information of the user. A target seat hardness is set based on the seat hardness associated with the identification information, and the seat hardness adjustment mechanism is controlled. With such a configuration, if the user inputs the identification information, the seat hardness can be automatically adjusted based on the previously set seat hardness.

The storage unit stores, in addition to the seat hardness previously set by the user, first vehicle type information indicating a first vehicle type for which the seat hardness is set, in association with the identification information. In addition, the seat hardness correspondence relationship between different vehicle models is stored, and when the control unit controls the seat hardness adjustment mechanism, the first vehicle model information stored in the storage unit and the A comparison is made with second vehicle type information indicating the type of the second vehicle used by the user, and if the first vehicle type information and the second vehicle type information match, the first vehicle type information stored in the storage unit When the seat hardness of the vehicle is set to the target seat hardness, and the second vehicle model information does not match the first vehicle model information, the seat hardness of the first vehicle stored in the storage unit is used. The seat hardness of the second vehicle to be set may be set to the target seat hardness. With such a configuration, the seat hardness can be appropriately adjusted even when the type of vehicle for which the seat hardness is stored in the storage unit is different from the type of vehicle used by the user.

The seat hardness adjustment mechanism includes a rubber bag-like member installed inside the seat, a compressor connected to the bag-like member, and a pressure reducing mechanism provided between the bag-like member and the compressor. and a valve, and the seat hardness may be adjusted by adjusting the internal pressure of the bag-like member. With such a configuration, the seat hardness can be easily adjusted.

The storage unit stores data indicating changes over time in the relationship between the internal pressure and hardness of the bag-shaped member, and the control unit refers to the data to control the bag corresponding to the target sheet hardness. The internal pressure of the shaped member may be controlled.
Alternatively, a sensor for measuring the hardness of the bag-shaped member is further provided, and the control unit adjusts the internal pressure of the bag-shaped member based on measurement data of the hardness of the bag-shaped member measured by the sensor. Feedback control may be used.
With such a configuration, the desired seat hardness set by the user can be adjusted regardless of changes over time in the relationship between the internal pressure of the bag-shaped member and the hardness.

When the seat hardness adjustment system shuts down, the controller may set the internal pressure of the bag-shaped member to atmospheric pressure. Degradation of the rubber bag-like member can be suppressed by keeping the internal pressure of the bag-like member at the atmospheric pressure while the sheet is not used.

A sheet hardness adjustment method according to an aspect of the present invention includes:
A vehicle seat hardness adjustment method for adjusting the hardness of a seat mounted on a vehicle, comprising:
The seat hardness previously set by the user is stored in association with the identification information of the user,
A target seat hardness is set based on the seat hardness associated with the identification information input by the user, and the seat hardness is adjusted.

In the seat hardness adjustment method according to one aspect of the present invention, the seat hardness previously set by the user is stored in association with the user's identification information, and the seat hardness associated with the identification information input by the user is stored. Based on this, the target seat hardness is set and the seat hardness is adjusted. With such a configuration, if the user inputs the identification information, the seat hardness can be automatically adjusted based on the previously set seat hardness.

According to the present invention, it is possible to provide a vehicle seat hardness adjustment system capable of automatically adjusting the seat hardness based on the seat hardness previously set by the user.

1 is a schematic block diagram of a seat hardness adjustment system according to a first embodiment; FIG. 1 is a schematic block diagram of a seat hardness adjustment system according to a first embodiment; FIG. 3 is a schematic block diagram of a control unit in the seat hardness adjustment system according to the first embodiment; FIG. 4 is a schematic graph of measurement data of change over time of the relationship between internal pressure and hardness of the bag-shaped member. 4 is a schematic graph of data stored in a storage unit and showing changes over time in the relationship between internal pressure and hardness of the bag-shaped member. FIG. 7 is a schematic block diagram of a seat hardness adjustment system according to a second embodiment;

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Also, for clarity of explanation, the following description and drawings are simplified as appropriate.

(First embodiment)
<Configuration of seat hardness adjustment system>
First, a seat hardness adjustment system according to a first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 and 2 are schematic block diagrams of the seat hardness adjustment system according to the first embodiment.

As shown in FIGS. 1 and 2, the seat hardness adjustment system according to the present embodiment is a seat hardness adjustment system for vehicles such as automobiles, and includes a seat 10, a control unit 20, and a pressure adjustment mechanism 30. I have it. Therefore, the seat 10, the control unit 20, and the pressure adjustment mechanism 30 are all mounted on the vehicle. Although the vehicle is not particularly limited, it may be a vehicle that is not owned by the user, such as a rental car or a shared car.

Although FIGS. 1 and 2 are the same block diagram, FIG. 1 shows the flow of various signals when adjusting the seat hardness for the first time, and FIG. It shows the flow of various signals during adjustment.
First, with reference to FIG. 1, the configuration of the seat hardness adjustment system according to the present embodiment and the flow of signals when adjusting the seat hardness for the first time will be described.

The seat 10 is, but not limited to, a driver's seat, for example. Here, inside the sheet 10, a bag-like member BM made of rubber is installed. The hardness of the sheet 10 is adjusted by adjusting the internal pressure of the bag-shaped member BM. Specifically, the higher the internal pressure of the bag-like member BM, the harder the sheet 10 becomes.

As shown in FIG. 1, a user's (for example, driver's) identification information id and a user's request rq are input to the control unit 20 .
The identification information id is predetermined numbers, characters, symbols, bar codes, two-dimensional codes, biometric authentication information, etc. for identifying users. The identification information id is not limited at all, but is input via a touch panel, buttons, or the like (not shown) provided on the dashboard of the vehicle, for example. Alternatively, if the identification information id is a bar code, two-dimensional code, biometric information, or the like, it may be read by a reader (not shown) provided on the vehicle.

The request rq is an input signal corresponding to the seat hardness set by the user. The request rq is input via, for example, a touch panel, buttons, or the like provided on the dashboard of the vehicle, although it is not limited in any way.
The control unit 20 sets the request rq input by the user as the target seat hardness. Then, the control unit 20 generates the control signal cs (cs1 to cs3) based on this target seat hardness, and controls the pressure adjustment mechanism 30. FIG.

Here, FIG. 3 is a schematic block diagram of the controller in the seat hardness adjustment system according to the first embodiment. As shown in FIG. 3, the control unit 20 includes, as hardware, a CPU (Central Processing Unit) 21, a ROM (Read Only Memory) 22, a RAM (Random Access Memory) 23, and an I/O (Input/Output) 24. It has

The CPU 21 is, for example, a calculation unit that performs control processing, calculation processing, and the like, and generates control signals cs (cs1 to cs3) based on control programs, calculation programs, and the like.
ROM22 is a memory|storage part which memorize|stores a control program, an arithmetic program, etc. which are performed by CPU21, for example.
The RAM 23 is a storage unit that temporarily stores processing data and the like.
The I/O 24 is an input/output device that inputs data and signals from the outside and outputs data and signals to the outside.
That is, the control unit 20 has a function as a computer, and performs seat hardness adjustment processing based on the control program and the like.

Here, the ROM 22 or RAM 23, which is the storage unit, may store data indicating the temporal change in the relationship between the internal pressure and the hardness of the bag-like member BM. Based on the user's request rq, the control unit 20 refers to the data and controls the internal pressure of the bag-like member BM corresponding to the seat hardness requested by the user. Therefore, the desired seat hardness set by the user can be adjusted regardless of the change over time of the relationship between the internal pressure of the bag-shaped member BM and the hardness.
Note that this data is not essential. Moreover, the storage unit in which the data is stored is not limited to the ROM 22 or the RAM 23 and may be provided outside the control unit 20 . Details of the data will be described later.

The pressure adjustment mechanism 30 adjusts the internal pressure of the bag-like member BM based on the control signal cs (cs1 to cs3) output from the control section 20. FIG.
As shown in FIG. 1, the pressure regulating mechanism 30 includes a compressor CMP, a pressure reducing valve V1, and an exhaust valve V2. Although the configuration of the pressure adjustment mechanism 30 is not particularly limited, the configuration can easily adjust the internal pressure of the bag-like member BM.
In the seat hardness adjustment system according to this embodiment, the seat hardness adjustment mechanism includes the bag-like member BM and the pressure adjustment mechanism 30.

The compressor CMP is connected to the bag-shaped member BM by piping. The compressor CMP compresses air (AIR_IN) taken in from outside the system and supplies it to the bag-shaped member BM. The control unit 20 controls the operation of the compressor CMP, such as driving, stopping, rotation speed, and the like. In the example shown in FIG. 1, the operation of the compressor CMP is controlled by a control signal cs1 output from the control section 20. FIG.

The pressure reducing valve V1 is a valve for reducing the pressure of the air compressed by the compressor CMP and supplying it to the bag-shaped member BM. Therefore, the pressure reducing valve V1 is provided on the pipe between the compressor CMP and the bag-shaped member BM. When air is supplied to the bag-like member BM to raise the internal pressure, the exhaust valve V2 is closed. The control unit 20 controls the opening/closing and opening degree of the pressure reducing valve V1. In the example shown in FIG. 1, the operation of the pressure reducing valve V1 is controlled by the control signal cs2 output from the control section 20 so that the internal pressure of the bag-shaped member BM becomes a desired pressure.

The exhaust valve V2 is a valve for releasing air (AIR_OUT) from the inside of the bag-like member BM to the outside of the system. Therefore, the exhaust valve V2 is provided on a branched pipe between the bag-like member BM and the pressure reducing valve V1. When releasing air from the inside of the bag-shaped member BM to the outside of the system, the pressure reducing valve V1 is closed and the exhaust valve V2 is opened. The control unit 20 controls the opening/closing and opening degree of the exhaust valve V2. In the example shown in FIG. 1, the operation of the exhaust valve V2 is controlled by the control signal cs3 output from the control section 20. As shown in FIG.

For example, when the seat hardness adjustment system according to this embodiment shuts down, the controller 20 closes the pressure reducing valve V1 and opens the exhaust valve V2 to bring the internal pressure of the bag-shaped member BM to the atmospheric pressure. By setting the internal pressure of the bag-shaped member BM to atmospheric pressure while the sheet 10 is not used, deterioration of the rubber-made bag-shaped member BM can be suppressed.

The management server 40 includes a storage unit that stores the user's request rq, ie, the seat hardness set by the user, in association with the user's identification information id. The management server 40 is, for example, a cloud server and has computer functions. That is, the management server 40 is provided outside the vehicle and wirelessly connected to the control unit 20 . The identification information id and the user's request rq input by the user to the control unit 20 are transmitted to the management server 40, and the user's request rq is stored in association with the identification information id.

Note that the management server 40 is not essential. For example, instead of the storage unit of the management server 40, the storage unit of the control unit 20 (for example, the ROM 22, the RAM 23, etc.) may store the identification information id and the user's request rq. Also, the management server 40 may be a user's mobile terminal (for example, a smart phone) or the like.

Next, with reference to FIG. 2, the flow of various signals when adjusting the seat hardness for the second and subsequent times will be described.
From the second time onward, the management server 40 stores the request rq of the user at the first time, that is, the seat hardness set by the user at the first time. Therefore, when the user inputs the identification information id, the management server 40 transmits the sheet hardness (request rq) stored in association with the identification information id to the control unit 20 .
In addition, in FIG. 2 , the user's identification information id is input to the management server 40 via the control unit 20 , but may be directly input to the management server 40 .

The control unit 20 sets the request rq acquired from the management server 40 as the target seat hardness. Then, the control unit 20 generates the control signal cs (cs1 to cs3) based on this target seat hardness, and controls the pressure adjustment mechanism 30. FIG. Therefore, the user does not need to set the sheet hardness.

Here, if the vehicle is a rental car or a sharing car, the type of vehicle (first vehicle) whose request rq is stored in the management server 40 for the first time and the vehicle (second vehicle) that the user will use next time are types can be different. Therefore, in addition to the request rq, the management server 40 stores vehicle type information (first vehicle type information) indicating the type of the vehicle in association with the identification information id, and also stores the correspondence relationship of seat hardness between different vehicle types. You may remember.

In this case, the control unit 20 compares the vehicle type information stored in the management server 40 with vehicle type information (second vehicle type information) indicating the type of vehicle used by the user.
When the vehicle type information stored in the management server 40 matches the vehicle type information of the vehicle used by the user, the seat hardness of the vehicle stored in the management server 40 is set as the target seat hardness. On the other hand, when the vehicle type information stored in the management server 40 and the vehicle type information of the vehicle used by the user do not match, the seat hardness of the vehicle used by the user corresponding to the seat hardness of the vehicle stored in the management server 40 is determined. is set as the target sheet hardness.
With such a configuration, even if the type of vehicle for which the seat hardness is stored in the management server 40 is different from the type of vehicle used by the user, the seat hardness can be appropriately adjusted.

The type of vehicle is not particularly limited, but includes, for example, sedans, wagons, minivans, compact cars, sports, SUVs (Sport Utility Vehicles), and the like. For example, the seat hardness set for vehicles such as sedans, wagons, minivans, compact cars, etc., in which ride comfort is emphasized, is made to correspond to a harder seat hardness for vehicles in which ride comfort is not emphasized, such as sports cars and SUVs.
The types of vehicles may be more simply classified into sports-type vehicles and other vehicles (including self-driving vehicles).

As described above, in the seat hardness adjustment system according to the present embodiment, the seat hardness (request rq) previously set by the user is stored in the management server 40 in association with the user's identification information id. . Therefore, if the user inputs the identification information id, the seat hardness can be automatically adjusted based on the previously set seat hardness. In particular, even in a vehicle that the user does not own, such as a rental car or a shared car, the user does not need to set the seat hardness every time the vehicle is driven.

<Data showing changes over time in the relationship between the internal pressure and hardness of the bag-shaped member>
Next, with reference to FIGS. 4 and 5, the details of the data showing the change over time of the relationship between the internal pressure and hardness of the bag-like member will be described.
FIG. 4 is a schematic graph of measurement data of the change over time of the relationship between the internal pressure and hardness of the bag-shaped member. FIG. 5 is a schematic graph of data stored in the storage unit showing changes over time in the relationship between the internal pressure and hardness of the bag-shaped member.

The horizontal axis of FIG. 4 indicates the elapsed time from the manufacture of the bag-like member, and the vertical axis indicates the hardness of the bag-like member. FIG. 4 shows changes over time in hardness at different internal pressures X, Y, and Z [hPa] of the bag-shaped member. Each point arranged in a straight line indicates measurement data. The magnitude relationship among X, Y, Z and the atmospheric pressure is atmospheric pressure<Z<Y<X. That is, the higher the internal pressure, the higher the hardness of the bag-shaped member. The data shown in FIG. 4 are obtained by measuring the hardness of the bag-shaped member at internal pressures X, Y, Z [hPa] at each elapsed time.

As a matter of course, the data shown in FIG. 4 cannot be acquired using the bag-like member BM installed on the seat 10. In FIG. Therefore, for example, the data shown in FIG. 4 is acquired using a bag-shaped member having the same specifications as the bag-shaped member BM installed on the seat 10 . In other words, the bag-shaped member is used only for acquiring data on changes over time in the relationship between the internal pressure and hardness of the bag-shaped member, and is not used as a product. The hardness of the bag-like member can be measured by, for example, a sheet-like pressure-sensitive sensor that can be attached to the surface of the bag-like member.

It should be noted that FIG. 4 is only a schematic diagram and does not show actual measurement results.
In addition, in practice, data is acquired at more internal pressures than just the three internal pressures X, Y, and Z [hPa].
Furthermore, in the example shown in FIG. 4, the rubber bag-shaped member softens with the passage of time from manufacture, and the hardness of the bag-shaped member decreases at any internal pressure. On the other hand, it is possible that the rubber bag-shaped member hardens with the lapse of time from its manufacture, and the hardness of the bag-shaped member increases.

FIG. 5 is a graph of data showing changes over time in the relationship between the internal pressure and hardness of the bag-like member. This data is stored in the storage section (ROM 22, RAM 23) of the control section 20. FIG. The data shown in FIG. 5 are the measurement data of the change over time of the relationship between the internal pressure and the hardness of the bag-shaped member shown in FIG. It is generated based on the measured data. The sheet hardness can be controlled more accurately than using the measurement data of the change with time of the relationship between the internal pressure and the hardness of the bag-like member shown in FIG. 4 as it is.
As the data indicating the change over time of the relationship between the internal pressure and hardness of the bag-shaped member stored in the storage unit, the measurement data of the change over time of the relationship between the internal pressure and hardness of the bag-shaped member shown in FIG. may be used.

As shown in FIG. 5, in the three straight lines related to the internal pressures X, Y, and Z [hPa], only the hardness at the time of manufacture is measured data, and the other portions are predicted data. The measurement data of the hardness at the time of manufacture may be measured for all products of the bag-shaped member, or may be measured for each predetermined production lot. By measuring each predetermined production lot, the number of hardness measurements during production can be reduced.

Here, the slope of the straight line at the internal pressure X [hPa] shown in FIG. 4 is used as the slope of the straight line at the internal pressure X [hPa] shown by the dashed line in FIG. Similarly, the internal pressure Y , Z[hPa] is used.

Based on the user's request rq, the control unit 20 refers to the data shown in FIG. 5 and controls the internal pressure of the bag-shaped member to correspond to the sheet hardness requested by the user (i.e., the hardness of the bag-shaped member). . As shown in FIG. 5, the internal pressure set for the user's request rq changes according to the elapsed time from manufacture.

The example shown in FIG. 5 will be described in detail. Here, let t be the elapsed time from manufacture, and P be the internal pressure of the bag-like member BM.
At t<T1, the controller 20 controls the internal pressure P to a predetermined value that satisfies P<Z [hPa].
At the elapsed time t=T1, the controller 20 controls the internal pressure P to Z [hPa].
At T1<t<T2, the controller 20 controls the internal pressure P to a predetermined value that satisfies Z[hPa]<P<Y[hPa].

At t=T2, the controller 20 controls the internal pressure P to Y [hPa].
At T2<t<T3, the controller 20 controls the internal pressure P to a predetermined value that satisfies Y[hPa]<P<X[hPa].
At t=T3, the controller 20 controls the internal pressure P to X [hPa].
When t>T3, the controller 20 controls the internal pressure P to a predetermined value that satisfies P>X [hPa].

(Second embodiment)
Next, a seat hardness adjustment system according to a second embodiment will be described with reference to FIG. FIG. 6 is a schematic block diagram of a seat hardness adjustment system according to the second embodiment. FIG. 6 corresponds to FIG.
As shown in FIG. 6, the seat hardness adjustment system according to this embodiment includes a pressure sensor PS in addition to the seat 10, controller 20, and pressure adjustment mechanism 30 shown in FIG.

The pressure sensor PS is a sensor that measures the hardness of the bag-shaped member BM. The pressure-sensitive sensor PS is, for example, a sheet-like sensor and is attached to the surface of the bag-like member BM.
As shown in FIG. 6, the control unit 20 feedback-controls the internal pressure of the bag-shaped member BM based on measurement data of the hardness of the bag-shaped member BM measured by the pressure sensor PS. Therefore, without using the data shown in FIG. 5, it is possible to adjust the sheet hardness to the desired one set by the user, regardless of changes over time in the relationship between the internal pressure of the bag-shaped member BM and the hardness.
Since other configurations are the same as those of the first embodiment, description thereof is omitted.

In the above examples, the various control programs can be stored and provided to the computer using various types of non-transitory computer readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-transitory computer readable media include magnetic recording media (eg, floppy disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical discs), CD-ROMs, CD-Rs, CD-R/Ws , semiconductor memory (eg, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM). The program may also be delivered to the computer on various types of transitory computer readable medium. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. Transitory computer-readable media can deliver the program to the computer via wired channels, such as wires and optical fibers, or wireless channels.

It should be noted that the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the invention.

10 seat 20 control unit 30 pressure regulating mechanism 40 management server BM bag-like member CMP compressor PS pressure sensor V1 pressure reducing valve V2 exhaust valve id identification information rq request

Claims (7)

A seat hardness adjustment mechanism that adjusts the hardness of the seat mounted on the vehicle,
A seat hardness adjustment system for a vehicle, comprising a control unit that controls the seat hardness adjustment mechanism,
further comprising a storage unit that stores the seat hardness previously set by the user in association with the identification information of the user;
The control unit sets a target seat hardness based on the seat hardness associated with the identification information input by the user, and controls the seat hardness adjustment mechanism.
Seat hardness adjustment system. The storage unit
In addition to the seat hardness previously set by the user, first vehicle type information indicating a type of a first vehicle for which the seat hardness is set is stored in association with the identification information. It memorizes the corresponding relationship of sheet hardness between
The control unit
When controlling the seat hardness adjustment mechanism, the first vehicle type information stored in the storage unit is compared with the second vehicle type information indicating the type of the second vehicle used by the user,
when the first vehicle type information and the second vehicle type information match, setting the seat hardness of the first vehicle stored in the storage unit to the target seat hardness;
When the first vehicle type information and the second vehicle type information do not match, the seat hardness of the second vehicle corresponding to the seat hardness of the first vehicle stored in the storage unit is set as the target. set the sheet hardness,
The seat hardness adjustment system according to claim 1. The seat hardness adjustment mechanism is
a rubber bag-like member installed inside the sheet;
a compressor connected to the bag-like member;
a pressure reducing valve provided between the bag-shaped member and the compressor,
The sheet hardness is adjusted by adjusting the internal pressure of the bag-shaped member.
The seat hardness adjustment system according to claim 1 or 2. The storage unit stores data indicating changes over time in the relationship between internal pressure and hardness of the bag-shaped member,
The control unit refers to the data and controls the internal pressure of the bag-shaped member corresponding to the target sheet hardness.
The seat hardness adjustment system according to claim 3. Further comprising a sensor for measuring the hardness of the bag-shaped member,
The control unit feedback-controls the internal pressure of the bag-shaped member based on measurement data of the hardness of the bag-shaped member measured by the sensor.
The seat hardness adjustment system according to claim 3. When the seat hardness adjustment system shuts down,
The control unit sets the internal pressure of the bag-shaped member to atmospheric pressure,
The seat hardness adjustment system according to any one of claims 3-5. A vehicle seat hardness adjustment method for adjusting the hardness of a seat mounted on a vehicle, comprising:
The seat hardness previously set by the user is stored in association with the identification information of the user,
setting a target seat hardness and adjusting the seat hardness based on the seat hardness associated with the identification information input by the user;
Sheet hardness adjustment method.

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