JP2006006511A - Vehicle seat device and method of adjusting vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle seat device allowing an occupant to take an optimum driving posture by automatically adjusting a seat cushion when the center-folding angle of a seat back with a center-folding function is changed. <P>SOLUTION: The device is structured so that the center-folding angle θ2 determined by the angle of inclination of a seat back upper part 15 to a seat back lower part 14, which are independently tilted, is detected by seat back upper/lower state detection means 110 and 107, and the seat cushion 11 is lifted by a seat lifter/slide-driving control part 103 according to the increase of the center-folding angle θ2. Accordingly, the occupant can take the seating posture with a reduced load on the vertebral column by bringing the shape of the lumbar vertebrae close to a straight line according to the increase of the center-folding angle θ2 of the seat back 11. Further, impairment of the operability of a steering wheel and the visibility of the occupant can be prevented by the lifting of the seat cushion 11. In this way, the occupant can keep a seating posture with less fatigue in the long-time driving. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle seat device and a method for adjusting the seat device.

  As a conventional vehicle seat device, an ID code that stores each driver's driving position in advance is attached to a key, and the driving position corresponding to the driver is adjusted by inserting the key into a key cylinder, for example, A driving position automatic adjustment system that automatically performs driver seat adjustment, steering position adjustment, door mirror adjustment, and room mirror adjustment has been proposed (see, for example, Patent Document 1).

  In this case, in the driver seat adjustment, a slider that moves the seat cushion back and forth, a lifter that moves the seat cushion up and down, a reclining that tilts the seat back back and forth, a headless lifter that moves the headrest up and down, and the like are driven.

There is also known a vehicle seat in which a seat back is constituted by a seat back upper part and a seat back lower part, which are divided into upper and lower parts, and the upper and lower parts of the seat back are folded (see, for example, Patent Document 2). ).
Japanese Patent Laid-Open No. 9-123924 (page 4, FIG. 1) Japanese Patent Laying-Open No. 2003-210275 (second page, FIG. 2)

  However, in this conventional driving position automatic adjustment system, as shown in Patent Document 1, the driving position set individually by the occupant is reproduced by inserting a key. When the reclining setting of the back is changed, the steering wheel position and the like change with the change of the reclining, and the optimal driving posture cannot be taken in combination with the change of the eye point and the like.

  In addition, even when the vehicle seat having the function of folding the seat back shown in Patent Document 2 is provided with the function of Patent Document 1, the optimal driving posture is similarly lost.

  Therefore, the present invention provides a vehicle seat device and a vehicle seat adjustment method that can automatically adjust the seat cushion and take an optimum driving posture when the angle of the seatback having the center folding function is changed. I will provide a.

The vehicle seat device of the present invention includes a seat back lower part and a seat back upper part obtained by dividing the seat back into upper and lower parts, and a seat back driving means for independently tilting the seat back lower part and the seat back upper part,
A vehicle seat including at least a seat cushion driving means for moving the seat cushion up and down,
A seat back folding angle detecting means for detecting a folding angle determined by an inclination angle of the seat back upper portion with respect to the seat back lower portion;
The most important feature is that a seat cushion control means for raising the seat cushion with an increase in the folding angle is provided.

  According to the vehicle seat device of the present invention, the seat cushion drive means is driven by the seat cushion control means to raise the seat cushion as the seatback folding angle detected by the seatback folding angle detection means increases. As the seatback is lowered, the lumbar vertebrae of the occupant can be brought closer to a straight line to increase the seatback and the seating posture can be reduced, and the operability and visibility of the steering wheel can be improved by raising the seat cushion. There is an advantage that it can be prevented from being damaged, and a seating posture with less fatigue can be secured even by driving for a long time.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 8 show an embodiment of a vehicle seat device according to the present invention, FIG. 1 is a side view showing a seat configuration of the vehicle seat device, and FIG. 2 is a block diagram showing a drive system of the vehicle seat device. FIG. 3 is an explanatory diagram showing a flowchart for executing a control procedure for setting a seating posture with less fatigue by the vehicle seat device, and FIG. 4 shows a normal driving posture in (a) and a fatigue reduction posture A in (b) ( FIG. 5 is an explanatory diagram showing the fatigue reduction posture B, FIG. 5 is an explanatory diagram showing the inclination angles of the seat cushion, lower seat back and upper seat back of the vehicle seat, and FIG. 6 is an illustration of each movable part of the vehicle seat. FIG. 7 is an explanatory diagram illustrating a matrix of criteria for determining each driving posture, and FIG. 8 is a flowchart for executing control of each movable portion of the vehicle seat. Explanation showing It is.

  The vehicle seat device 1 of the present embodiment is applied to a driver's seat 10, and as shown in FIG. 1, a seat cushion 11 of the driver's seat 10 is installed on a vehicle body floor F via a lifter / slide part 13. A seat back 12 is attached to the seat cushion 11.

  The seat back 12 is vertically divided into a seat back lower part 14 and a seat back upper part 15, and the seat back lower part 14 is supported by a lower frame 16, and a lower end part of the lower frame 16 is used as a rear end part of the seat cushion 11. It can be tilted back and forth.

  Further, the seat back upper portion 15 is supported by the upper frame 17, and a substantially central portion in the vertical direction of the upper frame 17 is attached to an upper end portion of the seat back upper support arm 18 so as to be able to tilt forward and backward. Is attached to the rear end of the seat cushion 11 so as to tilt forward and backward.

  Further, a steering wheel 20 serving as a driving operation system including a tilt / telescopic unit 19 is located in front of the driver's seat 10. In addition, although the steering wheel 20 is illustrated as a driving | operation operation system, there exist an operation button etc. of the various functions arrange | positioned at a control lever or an instrument panel besides this.

  That is, the vehicle seat device 1 of the present embodiment has the configuration shown in FIG. 2, and includes a seat drive calculation unit 101, a seat drive determination unit 102, a seat lifter / slide drive control unit 103 as a seat cushion control unit, and a lower seat back. A drive control unit 106, a seat back upper drive control unit 109, a tilt / telescopic drive control unit 112, and road environment detection means 115 are provided.

  The seat drive calculation unit 101 exchanges information with the seat drive determination unit 102. The seat drive determination unit 102 includes a seat lifter / slide drive control unit 103, a seat back lower drive control unit 106, a seat back upper drive control unit 109, a tilt. Information is exchanged with the telescopic drive control unit 112 and the road environment detection unit 115.

  The seat lifter / slide drive control unit 103 receives detection signals for the vertical position and the front / rear position of the seat cushion 11 detected by the seat lifter / slide state detection means 104, and seat lifter / slide drive means as the seat cushion drive means. An up / down / front / rear drive signal of the seat cushion 11 is output to 105 and a feedback signal thereof is input.

  A detection signal for the reclining angle of the lower seat back 14 detected by the lower seat back state detecting means 107 is input to the lower seat back driving control unit 106 and a reclining driving signal is output to the lower seat back driving means 108. At the same time, the feedback signal is input.

  The seat back upper drive control unit 109 receives a detection signal of the front / rear inclination angle of the seat back upper part 15 detected by the seat back upper state detection means 110 and sends a front / rear inclination drive signal to the seat back upper drive means 111. In addition to outputting, the feedback signal is input.

  The tilt / telescopic drive control unit 112 receives detection signals of the vertical position and front / rear position of the steering wheel 20 detected by the tilt / telescopic state detection unit 113 and outputs a drive signal to the tilt / telescopic drive unit 114. In addition, the feedback signal is input.

  The road environment detection means 115 receives the map information stored in advance from the map information providing means 116 and the detection signal of the current traveling position detected by the vehicle position detection means 117.

  Further, the seat drive determination unit 102 receives a detection signal of the presence or absence of a rear seat occupant detected by the rear seat occupant detection means 118 and an elapsed time from the start of operation integrated by the operation time detection means 119. .

  The seat back lower drive means 108 is provided at an attachment portion between the lower frame 16 and the seat cushion 11, and a reclining angle of the seat back lower portion 14 with respect to the seat cushion 11 can be arbitrarily set.

  Further, the seat back upper drive means 111 is provided on the attachment portion between the first drive means 111 a provided at the attachment portion between the upper frame 17 and the seat back upper support arm 18, and the seat back upper support arm 18 and the seat cushion 11. The first driving means 111a arbitrarily sets the front / rear tilt angle of the seat back upper portion 15 with respect to the seat back upper support arm 18, and the second driving means 111b allows the seat cushion 11 to be set. The reclining angle of the seat back upper support arm 18 can be arbitrarily set.

  At this time, as shown in FIG. 1, the seat back lower drive means 108 and the second drive means 111 b are arranged coaxially, and the seat lifter / slide drive means 103 is a lifter / slide part of the seat cushion 11. 13 is provided.

  The seat back lower driving means 108 and the seat back upper driving means 111 including the first and second driving means 111a and 111b constitute a seat back driving means 120.

  Here, in the vehicle seat device 1 according to the present embodiment, the seatback middle folding angle that detects the middle folding angle θ2 (see FIG. 5) determined by the inclination angle of the seatback upper portion 15 with respect to the seatback lower portion 14 of the driver's seat 10 is detected. An angle detection means 121 and a seat cushion control means for raising the seat cushion 11 with the increase of the folding angle θ2 are provided, and the seat lifter / slide drive control unit 103 is used as the seat cushion control means. Yes.

  The seat back folding angle detection means 121 is composed of a seat back lower state detection means stage 107 and a seat back upper state detection means 110, and based on detection information of both the detection means 107 and 110, the seat drive calculation unit 101 and the seat. The drive determination unit 102 calculates the bending angle θ2.

  In the seat adjustment method for the driver's seat 10, the seat cushion 11 is raised so that the front lower angle of the driver D does not deviate from a predetermined range as the middle folding angle θ <b> 2 of the seat back 12 increases. It has become.

  At this time, the seat lifter / slide drive control unit 103 has a function of moving the seat cushion 11 forward of the vehicle as the seat cushion 11 rises with an increase in the folding angle θ2 of the seat back 12.

  That is, in the present embodiment, the vehicle seat device 1 is in a vehicle traveling state according to the driving scene and the number of passengers, and provides a seating posture with less fatigue even when driven for a long time. The control will be described below with reference to FIGS.

  In the flowchart of FIG. 3, first, during normal boarding, the driver operates each movable part of the driver's seat 10 according to the individual driver's physique so that the sitting posture is optimized in step S20 when driving on a general road. As shown in FIG. 4A, the driver D takes a normal driving posture in which the relative relationship between the seat back lower portion 14 and the seat back upper portion 15 is not a bent shape.

  Next, in step S21, the state set by the driver D is detected by the seat lifter / slide state detecting unit 104, the seat back lower state detecting unit 107, and the seat back upper state detecting unit 110.

  In the present embodiment, the movement amount of the seat cushion 11 is calculated based on the physique of the driver D and the sitting posture.

  That is, in step S22, the physique of the driver D is calculated from the detected seat slide position, and in step S23, it is detected by the rear seat occupant detection means 118 whether there is an occupant in the rear seat.

  When the vehicle is in a running state, in step S24, the road environment detecting unit 115 determines what road the host vehicle is traveling from the information provided by the map information providing unit 116 such as navigation and the vehicle position detecting unit 117. Information is always provided to the sheet drive determination unit 102.

  Next, in step S25, the elapsed time from the start of driving is detected by the driving time detecting means 119, and thereby the degree of fatigue due to the posture of the driver D is determined based on a predetermined time.

  In the next step S26, the seat drive calculation unit 102 determines an appropriate posture to be taken by the driver D based on the information on the presence or absence of the rear seat passenger detected in step S23 and the fatigue level determined in step S25. In S <b> 27, the driving amount of the sheet movable unit for realizing the proper posture is calculated by the sheet drive calculation unit 101.

  Then, in step S28, the lifter / slide part 13, the seat back lower part 14 and the seat back upper part 15 are driven according to the state of the proper posture, and at the same time, the necessity of driving the operation system according to the state of the proper posture is determined in step S29. If necessary, after the driving amount is calculated based on the physique of the driver D, the state of the seat movable portion and the appropriate posture in step S30, the tilt / telescopic driving means 114 in step S31 tilts the steering wheel 20. The telescopic unit 19 is driven.

  The flowchart is always repeated at predetermined time intervals during driving of the vehicle, so that the seat back driving means 120 and the seat lifter / slide driving means 105 can be driven to provide the driver D with a proper posture at all times. Fatigue can be reduced.

  At this time, the seat lifter / slide drive control unit 103 as the seat cushion control means calculates the amount of movement of the seat cushion 11 so that the downward viewing angle of the driver D is substantially constant.

  The seat lifter / slide drive control unit 103 calculates the amount of movement of the seat cushion 11 so that the back surface angle of the seat back lower portion 14 is substantially constant with respect to the vehicle (for example, a predetermined position on the floor). ing.

  Further, the seat lifter / slide drive control unit 103 calculates the amount of movement of the seat cushion 11 so that the relative position between the steering wheel 20 and the upper body of the driver D, for example, the rib cage, is substantially constant. Yes.

  In other words, in the present embodiment, the road environment determined in step S24, the presence / absence of the backseat passenger determined in step S23, and the fatigue level of the passenger determined in step S25 are optimal for the driver D. The seat drive determination unit 102 is provided as an appropriate posture determination unit for determining a seating posture. Based on the determination of the seat drive determination unit 102, a seat back drive unit 120 and a seat lifter / slide drive unit 105 as a seat cushion drive unit are provided. It comes to drive.

  Here, as the optimal seating posture of the driver D, as shown in FIG. 4A, as shown in FIG. 4A, the normal driving posture set when the driver D normally drives the urban area, and as shown in FIG. Maintaining the absolute angle of the seat back upper portion 15 in the normal driving posture, the fatigue reduction posture A reclining the seat back lower portion 14, and the seat back upper portion 15 in the fatigue reduction posture A as shown in FIG. There is a fatigue reduction posture B in which the relative relationship between the lower seat back 14 and the absolute angle of the seat cushion 11 is maintained, and the seat cushion 11 is moved forward and upward, and these driving postures are automatically set. Yes.

  At this time, the reason for maintaining the relative relationship between the seat back upper and lower portions 15 and 14 and the state of the seat cushion 11 in the fatigue reduction posture A in the fatigue reduction posture B is that the cause of physical fatigue in the sitting posture is the pelvis and the rib cage This is because it is determined by the spinal column shape and the amount of abdominal compression determined by the relative angle of each other and the relative angle between the thigh and the pelvis.

  Accordingly, the relationship between the angles θ0 and θ1 of the seat cushion 11 and the seat back lower portion 14 shown in FIG. 5 with respect to the floor and the folding angle θ2 of the seat back upper portion 15 with respect to the seat back lower portion 14 is shown in FIG. 6 (a) and 6 (d). On the other hand, in the case of the fatigue reduction posture B, the relationship is as shown in FIGS. 6 (b) and 6 (c). The seat back upper part 15 and the lifter / slide part 13 are driven in accordance with predetermined characteristics.

  At this time, as shown in FIG. 6E, the driving condition is to keep the forward lower angle of the normal driving posture determined from the physique of the driver D and the vehicle within a predetermined allowable range.

  As described above, in the present embodiment, the normal driving posture, the fatigue reduction posture A, and the fatigue reduction posture B described above are selectively used according to the road environment, the presence / absence of a rear seat passenger, and the fatigue level of the driver D. However, the criterion is the matrix shown in FIG.

  That is, by dividing the difference between the driving scenes in the field of view near the vehicle and the availability of the backseat space as distinguished from the urban area and the expressway, by multiplying the fatigue state of the driver D converted from the elapsed driving time, respectively. Each driving posture is determined.

  Such driving postures are created by driving the movable parts of the lifter / slide part 13 of the driver's seat 10, the seat back upper / lower parts 15, 14 and the tilt / telescopic part 19. FIG. 8 shows a flow in which drive signals are sent to the drive means 105, 111, 108, 114 of the 13, 15, 14, 19 and the drive control is performed in response to the signals of the respective state detection means 104, 110, 107, 113. The flowchart will be described.

  That is, in this flowchart, the target value of the state after driving is set by each control unit 103, 106, 109, 112 in step S50 and a driving signal is sent, and in step S51, each driving means 105, 108, 111, 114 is sent. Drive.

  In step S52, the state detection means 104, 107, 110, 113 are driven until the target values are reached while the drive amounts of the movable parts 13, 15, 14, 19 are constantly monitored.

  With the above configuration, according to the vehicle seat device 1 of the present embodiment, the seat lifter / slide drive control unit 103 causes the seat back 12 to detect the folding angle θ2 of the seat back 12 detected by the seat back folding angle detection means 121. Since the seat lifter / sliding drive means 105 is driven to raise the seat cushion 11, the seat back posture is reduced by increasing the folding angle θ2 of the seat back 12 so that the driver's D lumbar vertebra approaches a straight line to reduce the spinal load. In addition to being able to secure a seating posture with less fatigue even during long-time driving, it is possible to reduce the loss of operability and visibility of the steering wheel 20 due to the rise of the seat cushion 11.

  Further, according to the vehicle seat adjustment method of the present embodiment, the seat cushion 11 is moved so that the front lower corner of the driver D does not deviate from a predetermined range as the middle folding angle θ2 of the seat back 12 increases. As the seat cushion 12 is raised, the steering wheel 20 is lifted when the seat cushion 11 is lifted so that the lumbar vertebra of the driver D is brought close to a straight line and the spine load is reduced. Can maintain good operability and visibility.

  The seat lifter / slide drive means 105 has a function of moving back and forth in addition to the up / down movement, and the seat lifter / slide drive control unit 103 is raised along with the rise of the seat cushion 11 as the center folding angle θ2 increases. Since the seat cushion 11 has a function of moving forward of the vehicle, not only the normal driving posture but also the steering wheel 20 when the driving posture with the lumbar spine close to a straight line and the spinal column load is reduced is taken. Without impairing the operability and the visibility of the driver D, it is possible to provide a seating posture with less fatigue even when driving for a long time.

  Further, since the movement amount of the seat cushion 11 is calculated based on the physique and seating posture of the driver D, even if the driver has different physiques, the seat cushion 11 can be seated according to various preferences of the driver. Even when taking a posture, it is possible to provide a seating posture with less fatigue even if the vehicle is driven for a long time without impairing the operability of the steering wheel 20 and the view of the driver D when taking a posture to reduce fatigue. .

  Furthermore, the seat lifter / slide drive control unit 103 calculates the amount of movement of the seat cushion 11 so that the downward viewing angle of the driver D is substantially constant. In this case, the driver D can sufficiently secure a downward view and can achieve safe driving.

  In addition, the seat lifter / slide drive control unit 103 calculates the amount of movement of the seat cushion 11 so that the back surface angle of the seat back lower portion 14 is substantially constant with respect to the vehicle. When taking the driving posture, it is possible to provide a seating posture with less fatigue even if driving for a long time without damaging the space in front of the rear seat occupant.

  Further, the seat lifter / slide drive controller 103 calculates the amount of movement of the seat cushion 11 so that the relative position between the steering wheel 20 and the upper part of the upper body of the driver D is substantially constant. Even in this case, the distance between the driver D and the steering wheel 20 can be kept substantially constant, so that deterioration in steering operability can be prevented.

  Furthermore, the seat drive determination unit 102 determines the optimum seating posture for the occupant from the combination of the road environment, the presence / absence of the rear seat occupant, and the occupant fatigue level, and the seat back driving means 120 and the seat lifter Since the slide driving means 105 is driven, a seating posture with less fatigue can be economically provided even by driving for a long time according to the usage of the vehicle according to the road environment and the number of passengers.

  Further, the seat back driving means 120 and the seat lifter / slide driving means 105 maintain the absolute angle of the seat back upper portion 15 in the normal driving posture set by the driver D when traveling in the city, and recline the seat back lower portion 14 to reduce fatigue. Maintaining the relative relationship between the posture A and the seat back upper portion 15 and the seat back lower portion 14 in the fatigue reduction posture A and the absolute angle of the seat cushion 11, the fatigue reduction posture B in which the seat cushion 11 is moved forward and upward; In the fatigue reduction posture A, the lumbar vertebra can be brought close to a straight line to reduce the spine load caused by the posture and provide a driving posture with less fatigue. In the fatigue reduction posture B, the knee angle can be By using this to change the posture, the rear surface of the driver's seat does not protrude forward and the steering Because it can maintain the relative relationship between Lumpur 20, it is possible to eliminate also the driving of the operation system while narrowing the space requirements.

  At this time, the reason why the posture is changed by the knee angle is that the knee joint has a low passive elastic characteristic and is soft among the joints of the lower limbs, so that a comfortable angle range is widened and sensitivity regarding posture comfort is low.

  In this embodiment, an appropriate posture corresponding to the driving scene is provided by automatic control. However, the driver D can freely select the posture, and the driver D can select the posture so that the driving is not hindered. Is possible.

  In addition, although the front lower angle defined by the eye point of the driver D is used as an index as a posture constraint condition for automatic control, the distance from the rear seat or the relative relationship between the steering and the shoulder point is used as an index, and the same condition is used for normal driving. The same effect can be obtained even when it is within a predetermined range from the posture.

  In this embodiment, the three driving postures are used properly. In the fatigue reduction posture B, the field of view and operability are the same as those in the normal driving posture, and the posture has a great fatigue reduction effect. It is also possible to provide the posture B and the normal driving posture continuously with respect to the reclining angle of the seat back lower portion 14.

  By the way, although the vehicle seat device of the present invention has been described by taking the above embodiment as an example, the present invention is not limited to this embodiment, and various other embodiments can be adopted without departing from the gist of the present invention.

It is a side view showing the seat composition of the vehicular seat device in one embodiment of the present invention. It is a block diagram which shows the drive system of the vehicle seat apparatus in one Embodiment of this invention. It is explanatory drawing which shows the flowchart which performs the control procedure for setting the seating posture with little fatigue by the vehicle seat apparatus in one Embodiment of this invention. It is explanatory drawing which shows the normal driving | running attitude | position to (b), the fatigue reduction attitude | position A to (b), and the fatigue reduction attitude | position B to (c) in one Embodiment of this invention, respectively. It is explanatory drawing which shows the inclination angle of the seat cushion of a vehicle seat, seat back lower part, and seat back upper part in one Embodiment of this invention, respectively. It is explanatory drawing which shows the relationship of the drive amount of each movable part of the vehicle seat in one Embodiment of this invention to (a)-(e), respectively. It is explanatory drawing which shows the matrix of the judgment reference | standard of each driving posture in one Embodiment of this invention. It is explanatory drawing which shows the flowchart which performs control of each movable part of the vehicle seat in one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat apparatus 10 Driver's seat 11 Seat cushion 12 Seat back 13 Lifter slide part 14 Seat back lower part 15 Seat back upper part 19 Tilt / telescopic part 20 Steering wheel 102 Seat drive judgment part (appropriate attitude judgment means)
103 Seat Lifter / Slide Drive Control Unit (Seat Cushion Control Unit)
105 Seat lifter / slide drive means (seat cushion drive means)
107 Seatback lower state detection means 110 Seatback upper state detection means 121 Seatback middle folding angle detection means θ2 Middle folding angle D Driver (occupant)

Claims (9)

A seat back driving means that includes a seat back lower part and a seat back upper part obtained by dividing the seat back into upper and lower parts, and these seat back lower part and seat back upper part respectively tilt independently;
A vehicle seat including at least a seat cushion driving means for moving the seat cushion up and down,
A seat back folding angle detecting means for detecting a folding angle determined by an inclination angle of the seat back upper portion with respect to the seat back lower portion;
A vehicle seat apparatus comprising: a seat cushion control unit that raises the seat cushion with an increase in the angle of folding.   The seat cushion drive means has a function of moving back and forth in addition to the vertical movement, and the seat cushion control means has a function of moving the seat cushion forward of the vehicle as the seat cushion rises with an increase in the folding angle of the seat back. The vehicle seat device according to claim 1, further comprising:   The vehicle seat device according to claim 1 or 2, wherein the movement amount of the seat cushion is calculated based on a physique and a sitting posture of the occupant.   The vehicle seat apparatus according to any one of claims 1 to 3, wherein the seat cushion control means calculates the movement amount of the seat cushion so that the downward view angle of the occupant is substantially constant.   The vehicle according to any one of claims 1 to 3, wherein the seat cushion control means calculates the movement amount of the seat cushion so that the back surface angle of the lower part of the seat back is substantially constant with respect to the vehicle. Sheet equipment.   The seat cushion control means calculates the amount of movement of the seat cushion so that the relative position between the driving operation system and the upper half of the occupant is substantially constant. The vehicle seat device according to claim.   A suitable posture determination means is provided to determine the optimal seating posture for the occupant from the combination of the road environment, the presence or absence of the rear seat occupant, and the fatigue level of the occupant, and the seat is determined based on the determination of the suitable posture determination means. The vehicular seat device according to any one of claims 1 to 6, wherein the back driving means and the seat cushion driving means are driven. The seat back driving means and the seat cushion driving means maintain the absolute angle of the upper part of the seat back in the normal driving posture set by the occupant when traveling in the city, and reduce the lower part of the seat back to reduce fatigue A.
Maintaining the relative relationship between the seat back upper part and the seat back lower part and the absolute angle of the seat cushion in the fatigue reducing attitude A, and automatically setting the fatigue reducing attitude B in which the seat cushion is moved forward and upward, The vehicle seat device according to claim 7. A seat back lower drive unit having a seat back lower part and a seat back upper part obtained by dividing the seat back vertically, and a seat back lower drive means and a seat back drive means having a seat back upper drive means for independently tilting the seat back lower part and the seat back upper part; ,
A vehicle seat including at least a seat cushion driving means for moving the seat cushion up and down,
A method for adjusting a vehicle seat, wherein the seat cushion is raised so as not to deviate from the predetermined range of the front lower corner of the occupant with an increase in the folding angle of the seat back.

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