JP5369470B2 - Vehicle seat device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular seat device capable of allowing an occupant to take an adequate seating posture in a seat without needing many load sensors. <P>SOLUTION: Based on information related to the seat condition, the floor reaction force received by soles of an occupant, and the physical constitution of the occupant, the seat reaction force received by each section of a body of the occupant is obtained to determine whether or not the occupant is in a target seating posture. If the occupant is not in the target seating posture, the seat condition is changed so as to become the target seating posture. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

    The present invention relates to a vehicle seat device.

Various ingenuity has been provided for vehicle seats, such as a comfortable seating posture with less fatigue, a stable seating posture with less shaking, and a seating posture that is less likely to cause drowsiness. Has been made. An example of such a vehicle seat device is described in Patent Document 1. That is, load sensors are placed on each of the seat cushion, upper seat back and lower seat back to detect the occupant's load acting on each part, and the occupant's seating posture becomes easy based on the load value of each part. Thus, the reclining angle of the seat back upper part and the seat back lower part is adjusted.
JP 2005-82043 A

    However, the conventional method of arranging load sensors in each part of the seat and detecting the occupant's load acting on each part requires many load sensors and increases the cost. Moreover, it is difficult to say that the seating posture can be determined with high accuracy by the method of detecting the load applied to each part of the seat from the occupant.

    Therefore, the present invention enables the occupant to take an appropriate sitting posture by accurately determining the occupant's sitting posture and changing the seat state without requiring many load sensors.

    In order to solve such a problem, the present invention pays attention to the fact that what kind of load is applied to the floor from the sole of the occupant seated on the seat has a great influence on the occupant's sitting posture. Using the sole load applied to the floor from the sole of the foot, it is determined whether or not the occupant is taking the target sitting posture.

The invention according to claim 1 is a seat state detecting means for detecting the state of the rear seat of the vehicle;
A seat state changing means for changing the state of the rear seat ;
Front seat movement means for moving the front seat of the vehicle in the front-rear direction;
Floor reaction force detection means provided on the floor of the vehicle for detecting floor reaction force received from the floor by the soles of the passengers seated on the rear seat ;
A physique information acquisition means for obtaining information related to the physique of the occupant;
Based on the state of the rear seat, the floor reaction force, and the physique-related information, a seat reaction force calculation means for obtaining a seat reaction force received from the rear seat by a plurality of seated occupant body parts, Seating posture determination means for determining whether or not the occupant has a predetermined target seating posture based on the distribution of the seat reaction force received by the part;
A seat state control means for controlling the operation of the seat state changing means so as to be in the target seating posture when the occupant is not in the target seating posture;
The seat state changing means changes at least the seating surface angle of the rear seat.
In the vehicle seat device, the seat state control unit moves the front seat forward when the target seating posture cannot be obtained by changing the seating surface angle of the rear seat. is there.

In other words, if Sadamare the state of the physical structure of the occupant and the rear seat, the floor reaction force that the rear seat seat seated occupant of the sole to receive, seat reaction force received by the occupant's body each site, of the occupant seated posture It depends on. Accordingly, the seat reaction force received by each part of the seated occupant body can be obtained based on the state of the rear seat, the floor reaction force of the soles, and the physique-related information. Then, by comparing the seat reaction force distribution of each part of the occupant's body and the seat reaction force distribution in the target sitting posture, it can be determined whether or not the occupant is in the target sitting posture. By changing the state of the rear seat , the occupant can be in the target sitting posture.

If there is a clearance between the occupant's thigh and the seat surface, the thigh will be supported by the seat surface of the rear seat if the seat angle of the rear seat is increased (the front end of the seat becomes higher). The range to be widened. As a result, the occupant's load is widely distributed on the seating surface, and the pressure applied to the buttocks (buttock) is reduced. That is, the pressure applied to the occupant's buttocks varies greatly depending on the seating surface angle of the rear seat . Therefore, in the present invention, the target seating posture is obtained by changing the seat seat surface angle that greatly affects the pressure applied to the buttocks. Further, when the target seating posture cannot be obtained by changing the seating surface angle of the rear seat, the front seat is moved forward . As a result, a space for the rear seat occupant is widened, and the occupant can easily take a desired sitting posture.

The invention according to claim 2 is the invention according to claim 1,
The seating posture determination means is characterized in that when the operating frequency of the seat state changing means is equal to or greater than a predetermined value, the criterion for determining the target seating posture is changed in a higher direction.

    In other words, the fact that the operating frequency of the seat state changing means is a predetermined value or more means that the occupant frequently changes its seating posture, for example, the vehicle travels for a long time and the occupant's fatigue level increases. It can be assumed that the user feels uncomfortable on the seat. Therefore, in that case, the criterion for determining the target sitting posture is increased (for example, when the target is a comfortable sitting posture, the criterion is changed so that the seating posture has a higher degree of comfort), and the seat state has a high target value. Is to change.

The invention according to claim 3 is the invention according to claim 1,
When the operating frequency of the seat state changing means is equal to or higher than a predetermined value, there is provided an informing means for notifying the passenger of that fact.

    As described above, the fact that the operating frequency of the seat state changing means is a predetermined value or more means that the occupant frequently changes its seating posture, that is, it can be assumed that the vehicle has traveled for a long time. In order to ensure safe driving and occupant health, attention is urged (the vehicle is stopped and encouraged to take a break).

As described above, according to the invention according to claim 1, based on the floor reaction force and the physical structure of the occupant-related information occupant sole seated state of the rear seat and to the rear seat sheet is subjected, passenger The seat reaction force received by each part of the body is determined to determine whether or not the occupant is in the target seating posture. When the occupant is not in the target seating posture, at least the seating surface angle of the rear seat is changed. In addition, when the target seating posture cannot be obtained by changing the seating surface angle, the front seat is moved forward, so that the seating posture of the occupant can be accurately determined without using a large number of sensors. And the passenger can easily take the desired seating posture by moving the front seat forward when the target seating posture cannot be obtained. It made.

According to the second aspect of the invention, when the operating frequency of the seat state changing means is equal to or higher than a predetermined value, the criterion for determining the target seating posture is changed in the direction of increasing, so that the occupant is in accordance with its fatigue level. An appropriate sitting posture can be obtained.

According to the third aspect of the invention, when the operating frequency of the seat state changing means is equal to or higher than the predetermined value, the passenger is informed of this, so the passenger's attention regarding safe driving and ensuring the health of the passenger is obtained. Can be aroused.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

    In the vehicle 1 shown in FIG. 1, 2 is a front seat, and 3 is a rear seat. On the front seat 2 side, a seat position sensor 4 for detecting the position of the front seat 2 in the vehicle front-rear direction and an actuator (front seat seat moving means) 5 for moving the seat 2 in the vehicle front-rear direction are provided. ing. On the rear seat 3 side, a seat surface angle sensor (seat state detecting means) 6 for detecting the seat surface angle (seat surface angle) of the rear seat 3 and an actuator (seat state changing means) for changing the seat angle. 7) and a 6-axis sensor 9 for detecting the sole load of the occupant M seated on the rear seat 3 is provided on the floor 8. The actuator 5 for moving the front seat and the actuator 7 for changing the seating angle are integrated with the CPU, RAM and ROM based on signals from the seat position sensor 4, the seating angle sensor 6 and the 6-axis sensor 9. The ECU 11 is controlled.

    The 6-axis sensor 8 is a sensor having a function capable of converting an external force acting on one point into an electric signal by converting three force components in each axial direction orthogonal to each other and three moment components around each axis, and simultaneously detecting them. The sole of the occupant M seated on the rear seat 3 serves as a floor reaction force detecting means for detecting a floor reaction force received from the floor 8 and serves as a physique information acquiring means for obtaining information related to the physique of the occupant M. .

    Explaining the terms used in the description of the embodiment, as shown in FIG. 2, a floor reaction force WL in the vertical direction and a floor reaction force TL in the front-rear direction are used as the floor reaction force. The seating surface angle θ is an upward inclination angle of the seating surface of the seat cushion 3a with respect to the horizontal line. The seat back angle η is a backward tilt angle of the seat back 3b with respect to the vertical line. The hip point height H is the height from the floor surface to the hip point of the occupant 6. The seat surface angle θ, the seat back angle η, and the hip point height H are all elements that define the seat state. In the present embodiment, the seat surface angle θ and the hip point height H define the seat state. It becomes important as an element.

    FIG. 3 is an explanatory diagram of joint angles that define the sitting posture of the occupant. The sitting posture includes a torso angle that is a backward tilt angle of the trunk center line B with respect to the vertical line, a rhino angle that is an upward tilt angle of the thigh with respect to the horizontal line, a knee angle that is an angle between the thigh T and the lower leg L, and the lower leg L and the foot. It can be defined by an ankle angle which is an angle formed with F and a shoe angle which is an angle of the foot F with respect to the horizon.

<Embodiment 1>
In this embodiment, the physique of the occupant seated in the rear seat 3 is estimated, and the seat state is changed so that the occupant is in a comfortable sitting posture. For this purpose, the ECU 11 functions as an occupant physique determination unit, an occupant seating posture detection unit, a seat reaction force calculation unit, an occupant seating posture determination unit, and a seat state control unit that controls the operation of the actuators 5 and 7. Further, the ECU 11 is provided with various databases for detecting the sitting posture, calculating the seat reaction force, determining the sitting posture, and the like.

    Hereinafter, a specific description will be given according to the flowchart of FIG.

    After the start, the signals of the seat position sensor 4, the seat surface angle sensor 6 and the 6-axis sensor 9 are read, and the physique of the occupant is determined in step A1. This physique determination is specifically shown in FIG. First, in step B1, the rear seat actuator 7 is actuated to minimize the seating surface angle θ. In the subsequent step B2, the measured value of the sole load Wfw by the 6-axis sensor 9 is read. The sole load Wfw corresponds to the floor reaction force WL in the vertical direction. In subsequent step B3, it is determined whether or not the sole load Wfw is a value within a predetermined load range (a range of Wfwmin to Wfwmax). This is a determination as to whether or not the occupant is seated in the rear seat, and a minimum value Wfwmin and a maximum value Wfwmax that are assumed as sole loads in the occupant seated state are set in advance.

    If the sole load Wfw is within a predetermined load range, it is determined that the occupant is seated, and the process proceeds to step B4, where the sole load Wfw is set as the initial sole load Wfwini. In the following step B5, the seating surface angle θ is increased by Δθ, and the sole load Wfw is measured in step B6. 0) is determined. Until the sole load measurement value Wfw becomes smaller than the initial sole load Wfwini, the increase in the seating surface angle θ in step B5 and the measurement of the sole load Wfw in step B6 are repeated, and the sole load measurement value Wfw becomes the initial sole If it becomes smaller than the load Wfwini, it is determined that there is no gap between the occupant's thigh and the seat surface (the heel is slightly lifted from the floor), and the process proceeds to Step B8.

    In step B8, the seating surface angle θ is decreased by Δθ / 2. As a result, the occupant is brought into a regular seating state where not only the toe side of the foot but also the heel is on the floor. In this state, the seating surface angle θ and the hip point height Hpini are acquired in the subsequent step B9, the foot load Wfw is measured in the subsequent step B10, and the foot sole is measured based on the measurement value of the 6-axis sensor 9 in the step B11. The center of gravity position (position in the front-rear direction) G is calculated. In the subsequent step B12, the physique of the occupant is determined based on the seating surface angle θ and hip point height Hpini in the previous step B9, the sole load Wfw in step B10, and the sole gravity center position G in the step B11. That is, a function f for estimating the physique from θ, Hpini, G, and Wfw is set in advance, and the physique of the occupant is determined by the function f. If the seat angle θ and the hip point height Hpini are determined, the sole gravity center position G and sole load Wfw of the occupant seated in the normal seating state (regular seating posture) on the seat are determined by the physique (height and height It is used that it becomes a value according to (weight). Note that the hip point height Hpini is a fixed value H in the case of the rear seat of the present embodiment that is not provided with an elevating mechanism.

    Returning to FIG. 4, in step A2, the seating posture of the rear seat occupant is based on the floor reaction force obtained from the 6-axis sensor 9, the occupant physique determined in step A1, and the hip point height H (seat state). Is detected. For this detection, a floor reaction force-joint angle database is used. This database is created and accumulated in advance for each physique for data representing the relationship between the floor reaction force WL in the vertical direction, the hip point height H, and the joint angle (such as a rhino angle) shown in FIG. FIG. 6 illustrates a floor reaction force curved surface (data) i in a certain physique. Utilizing the fact that if the hip point height H is determined, the floor reaction force WL when the occupant is seated on the seat in various sitting postures (various joint angles) will be a value corresponding to the physique of the occupant It is.

    Therefore, based on the floor reaction force WL and the hip point height H, the joint angle such as the rhino angle can be calculated using the physique data of the occupant determined in step A1. That is, the ECU 11 includes a database that defines the magnitude of the floor reaction force in relation to the seat state for each physique, such as the torso angle and the knee angle, as well as the rhino angle, and this database is used to The occupant's rhino angle and other joint angles are calculated (occupant's sitting posture detection). Note that a floor reaction force TL may be employed instead of the floor reaction force WL.

    In the subsequent step A3, using the joint angle-seat reaction force database, the seat reaction force received from the seat by each body part of the seated occupant is calculated based on the sitting posture (joint angle) of the occupant. FIG. 7 is an explanatory diagram of the seat contact point of the occupant for obtaining the seat reaction force, the lower thigh contact point 1, the thigh middle contact point 2, the hip contact point 3, the lower body contact point 4, and the upper body contact point. 5 is a typical body part for obtaining the seat reaction force. As shown in FIG. 8, the joint angle-sheet reaction force database is created by collecting in advance data representing the relationship between two types of joint angles and seat reaction forces for contact points 1 to 5 for each physique. It is. FIG. 8 illustrates the sheet reaction force curved surface (data) of each contact point in a certain physique. For example, if the occupant's rhino angle and torso angle are determined, the seat reaction force at the butt contact point 3 takes advantage of the value corresponding to the occupant's physique.

    In subsequent steps A4 and A5, an easy seating determination is made as to whether or not the occupant is in a comfortable seating posture using the seat reaction force database when seated comfortably. The seat state changing process is performed so that the sitting posture becomes comfortable. The specific contents of the comfortable seating determination in steps A4 and A5 are shown in FIG.

    That is, when the seat reaction force at each contact point is calculated in step A3, the process proceeds to step C1 in FIG. 9 to determine whether or not it is the first easy seating determination after getting on. This determination can be made by flag processing. That is, at the initialization after the start, the comfort seat determination flag is set to “0”, and when the comfort determination is made, the flag is set to “1”, and the boarding is performed when the flag is “0” or “1”. What is necessary is just to determine whether it is the first comfort determination after. When it is the first easy seating determination, the routine proceeds to step C2, and the thigh pressure load Pini of the occupant is made zero. The term “thigh pressure load” is used to mean a load applied to the thigh due to the weight of the body, and here it is synonymous with the seat reaction force at the contact point 1 in FIG.

    In the following step C3, the comfortable seating determination reference value R0 = thigh pressure load / butt body pressure load is set. The “butt body pressure load” is used to mean a load applied to the buttocks by the weight of the body, and here, it is synonymous with the seat reaction force at the contact point 3 in FIG. That is, in the present embodiment, it is determined whether or not the seating posture is an easy sitting posture based on the ratio of the thigh body pressure load to the buttocks body pressure load. As the thigh pressure load increases, the weight of the body is more widely distributed from the hips to the entire thigh, and the body feels no local pain.

    FIG. 10 shows the body pressure load (seat reaction force) on the sole, thigh (contact point 1), and buttocks (contact point 3) when various seating surface angles θ and hip point heights H are taken in the standard physique. Shows changes. The characteristic line E in which the thigh pressure load and the buttocks pressure load are substantially equal is the weakness state with the highest degree of comfort, and the thigh pressure load increases as the seat surface angle θ or the hip point height H decreases ( As the thigh pressure load / butt pressure load ratio decreases), the comfort level decreases. However, even if the thigh pressure load is reduced by about 35% from the value in the weak state, it has been confirmed by experiments that the subjective comfort of the occupant hardly changes. The thigh pressure load / butt body pressure load ratio when the value is about 35% lower than the value in the weak state can be determined as the comfort seating determination reference value R0.

    In the subsequent step C4, an actual thigh pressure load / butt body pressure load ratio R of the occupant is calculated based on the seat reaction force calculated in step A3. In the subsequent step C5, a threshold value α for determining the comfort seat is set, and in the subsequent step C6, it is determined whether or not the occupant is in the comfort seat posture (R0−α <R <R0 + α?). When the occupant is in the comfort sitting posture, the routine proceeds to step C7, where the thigh pressure load at that time is set to Pini, and in the subsequent step C8, "easy posture = YES" is set. That is, the determination in step A5 in FIG. If it is determined in step C6 that the occupant is not in the comfort sitting position, the process proceeds to step C9, where "ease posture = NO" is set. That is, the determination at step A5 in FIG.

    If it is determined in step C1 that it is not the first comfort determination after boarding, the process proceeds to step C10, and it is determined whether or not the thigh pressure load Pini is zero. In the case of “Pini = 0”, in the previous comfort seat determination, the process proceeds to “easy posture = NO” in step C9, and a seat state change process described later is performed. In this case, the comfort seat determination has already been performed. Since the reference value R0 is set, the process proceeds to step C4 and the subsequent steps, and a determination process is performed as to whether or not the seated posture is set by the seat state change process.

    When it is determined in step C10 that “Pini = 0” is not satisfied, this is a case where the previous easy seating determination has progressed from step C7 to “easy posture = YES” in step C8. That is, it means that the occupant once took an easy sitting posture based on the thigh body pressure load / butt body pressure load ratio R. After such an easy seating posture based on the ratio R is taken, the process proceeds to step C11 to calculate the ratio R1 of the current thigh pressure load to the previous thigh pressure load Pini, and in the subsequent step C12, the ratio R1 Threshold value β (easy sitting determination reference value) is acquired. In the subsequent step C13, it is determined whether or not R1 is larger than the threshold value β. If R1 is larger than the threshold value β, the process proceeds to step C14, where “comfort posture = YES” is set. When R1 is not larger than the threshold value β, the routine proceeds to step C15, where “easy posture = NO” is set.

    That is, after the occupant takes an easy seating posture based on the thigh pressure load / butt body pressure load ratio R, the comfort seat is not the thigh body pressure load / butt body pressure load ratio R but the thigh body pressure load ratio R1. The determination is performed to control the sitting posture of the occupant. Initially, a predetermined value is given to the threshold value β. When the occupant's seating fatigue becomes high, the threshold value β is successively increased. This point will be described later.

    Returning to the flow of FIG. 4, when it is determined in step A5 that the occupant's seating posture is not comfortable, the process proceeds to step A6, and the deviation from the target value (thigh pressure load / butt body pressure load). Based on the deviation amount of the ratio R from the comfort seat determination reference value R0 or the deviation amount of the thigh body pressure load ratio R1 from the threshold value β, the target seating surface angle θt is calculated. This target seating surface angle θt is stored in advance as a data by setting the relationship between the deviation amount and the seating surface angle correction amount in advance, and the seating surface angle correction amount is calculated from the stored data. It is obtained by adding the face angle correction amount to the current seating face angle. In this case, the bearing surface angle correction amount increases as the deviation amount increases.

    In subsequent step A7, it is determined whether or not the target seating surface angle θt is a value within a range between a predetermined lower limit value θmin and an upper limit value θmax. The lower limit value θmin and the upper limit value θmax are limit values of the seating surface angle that can be taken. When the target seating surface angle θt is a value within the range, the process proceeds to step A8, the seating surface angle changing actuator 7 is operated so that the target seating surface angle θt becomes the target seating surface angle θt. The change control count value N is incremented. The occupant can be placed in an easy seating posture by changing the seating angle.

    When the target seating surface angle θt is not a value within the above range in step A7, the process proceeds to step A10 and the front seat 2 is moved forward based on the position of the front seat 2 detected by the seat position sensor 4. Determine whether you can. When it is possible to move forward, the process proceeds to step A11, and as shown in FIG. 11, the front seat 2 is moved forward by a predetermined amount by the actuator 5.

    If it is determined in step A5 that the seating posture of the occupant is in the comfort posture, the process proceeds to step A12, and it is determined whether or not the control number value N of the seat angle change control exceeds a predetermined value No. When the control frequency value N exceeds the predetermined value No, the process proceeds to step A13, where the threshold value β (easy seating determination reference value) is changed and an alarm is issued.

    That is, when the control count value N exceeds the predetermined value No, the occupant moves his / her body to change his / her seating posture even if the seating angle change control is repeated so as to obtain an easy seating posture. That is, it is considered that the seating fatigue level of the occupant is high. Therefore, the threshold value β is increased by a predetermined amount so that the seat angle control with higher comfort can be performed, and the vehicle 1 is stopped by notifying that the fatigue level of the occupant is high. To encourage you to take a break. The threshold value β is successively increased every time it is determined that the control count value N exceeds the predetermined value No.

    In the case of this embodiment, step A1 is the occupant's physique determination means, step A2 is the occupant's seating posture detection means, step A3 is the seat reaction force calculation means, steps A4 and A5 are the occupant's seating posture determination means, Steps A6 to A8, A10, and A11 constitute seat state control means, and steps A12 and A13 constitute seating posture determination reference changing means and notification means, respectively.

<Embodiment 2>
This embodiment will be described with reference to the flowchart of FIG. In the first embodiment, the physique of the occupant is obtained based on the seating surface angle θ, the hip point height H, the sole load Wfw, and the sole gravity center position G. The physique and the sitting posture of the occupant are detected using the forces WL and TL.

    That is, in the flow of FIG. 12, after starting, the signals of the seat position sensor 4, the seating surface angle sensor 6, and the 6-axis sensor 9 are read, and in step D1, using the floor reaction force-joint angle database, The sitting posture is detected together with the physique.

    FIG. 13 illustrates data (floor reaction force curved surface i) representing the relationship among the floor reaction force WL in the vertical direction, the hip point height H, and the joint angle (such as a rhino angle) in a certain physique. FIG. 14 illustrates data (floor reaction force curved surface i) representing the relationship among the floor reaction force TL in the front-rear direction, the hip point height H, and the joint angle (such as a rhino angle) in the same physique. The database is created by collecting such data in advance for each physique.

    When the hip point height H is determined, the curve PQi and the curve RSi are cut out from the floor reaction force curved surface i corresponding to a certain physique i as shown in FIGS. Curves PQi and RSi are curves showing the relationship between the floor reaction force and the joint angle. 15 and 16 illustrate curves PQ and curves RS corresponding to various physiques.

In step D1, for each of the floor reaction forces WL and TL (measured values of the six-axis sensor 9), based on the hip point height H (in this embodiment, a fixed value), the floor reaction force-joint angle database is used to calculate the sizing angle, etc. The joint angle is calculated for each physique. 15 and 16 show joint angles θ ^W _{i + 1} , θ ^W _i , θ ^W _i such as a rhino angle corresponding to the floor reaction force WL in each physique when the measured values of the floor reaction forces WL, TL are given. ₋₁ , θ ^W _{i− 2} , joint angles θ ^T _{i + 1} , θ ^T _i , θ ^T _i−1 , θ ^T _i−2 such as a rhino angle corresponding to the floor reaction force TL in each physique are shown.

Then, the obtained joint angle θ ^W and the joint angle θ ^T are compared for each same physique (for example, the joint angle θ ^W _{i + 1 of} the physique _{i + 1} and the joint angle θ ^T _{i + 1} are compared), and the joint angle θ ^W and with the difference between the joint angle theta ^T determines the smallest body size as body size of the occupant, the average value of the difference is the smallest joint angle theta ^W and joint angle theta ^T and joint angle of the occupant. Since it is the floor reaction force WL and the floor reaction force TL is determined in accordance with the joint angle in the seating state of the occupant, a floor and joint angle theta ^T determined from the joint angle theta ^W and the floor reaction force TL obtained from the reaction force WL is It uses the fact that it is essentially the same angle. That is, since they should be the same angle, the physique with the smallest difference between the joint angle θ ^W and the joint angle θ ^T obtained from the database is reasonable as the physique of the occupant.

    As described above, after detecting the physique and seating posture (joint angle of each part) of the occupant, the process proceeds to step D2 and subsequent steps. Each step after step D2 is the same as each step after step A3 in FIG. 4 according to the first embodiment, and the description thereof is omitted because it is redundant. In the case of this embodiment, step D1 constitutes occupant physique determination means and occupant sitting posture (joint angle) detection means. Further, the floor reaction force WL and the floor reaction force TL are physique related information for determining the physique of the occupant.

    According to this embodiment, unlike Embodiment 1, there is no need for the occupant to be in a normal seating state for physique determination, that is, there is no need to raise or lower the occupant's legs, which makes the occupant feel uncomfortable. There is no concern.

The above embodiments 1 and 2 is a case that the occupant of the rear seat 3 in comfort seating posture, the present invention is cheap comfortably seated in not limited, for example, stabilizing such other objects of the sitting posture of the occupant It is also possible to perform seating posture control.

In the first and second embodiments, the seating posture of the occupant is controlled by changing the seat angle. However, a means for raising and lowering the seat may be provided to change the hip point height. Alternatively, the seat back angle may be changed in addition to the change of the seating surface angle and the hip point height.

It is a lineblock diagram of a vehicular seat device concerning an embodiment of the present invention. It is explanatory drawing of a floor reaction force and a sheet | seat state. It is explanatory drawing of a passenger | crew's sitting posture (joint angle). FIG. 3 is a flowchart showing a control flow according to the first embodiment. It is a flowchart figure which shows the flow of the passenger | crew's physique determination control which concerns on Embodiment 1. FIG. It is a figure which shows the floor reaction force curved surface (data) of the physique with a passenger | crew included in a floor reaction force-joint angle database. It is explanatory drawing about a passenger | crew's seat contact point. It is a figure which shows the seat reaction force curved surface (data) of each contact point of a physique with a passenger | crew. It is a flowchart figure which shows the flow of the comfort seat determination. It is a graph which shows the body pressure load of each site | part of a passenger | crew in various seat surface angles and hip point height. It is a side view which shows a mode that a front seat seat is moved ahead. FIG. 6 is a flowchart illustrating a control flow according to the second embodiment. It is a figure which shows the floor reaction force curved surface (data) of the up-down direction of the physique with a passenger | crew included in a floor reaction force-joint angle database. It is a figure which shows the floor reaction force curved surface (data) of the front-back direction of the physique with a passenger | crew included in a floor reaction force-joint angle database. It is a graph which shows the relationship between the floor reaction force of the up-down direction in a certain hip point height, and the joint angles (Rhino angle etc.) in various physiques. It is a graph which shows the relationship between the floor reaction force of the front-back direction in a certain hip point height, and the joint angle (Rhino angle etc.) in various physiques.

1 Vehicle 2 Front Seat 3 Rear Seat 4 Front Seat Position Sensor 5 Actuator (Front Seat Movement Means)
6 Seat angle sensor (seat condition detection means)
7 Actuator (Sheet condition changing means)
8 Floor 9 6-axis sensor (Floor reaction force detection means)
11 ECU

Claims (3)

Seat state detecting means for detecting the state of the rear seat of the vehicle;
A seat state changing means for changing the state of the rear seat ;
Front seat movement means for moving the front seat of the vehicle in the front-rear direction;
Floor reaction force detection means provided on the floor of the vehicle for detecting floor reaction force received from the floor by the soles of the passengers seated on the rear seat ;
A physique information acquisition means for obtaining information related to the physique of the occupant;
Based on the state of the rear seat, the floor reaction force, and the physique-related information, a seat reaction force calculation means for obtaining a seat reaction force received from the rear seat by a plurality of seated occupant body parts, Seating posture determination means for determining whether or not the occupant has a predetermined target seating posture based on the distribution of the seat reaction force received by the part;
A seat state control means for controlling the operation of the seat state changing means so as to be in the target seating posture when the occupant is not in the target seating posture;
The seat state changing means changes at least the seating surface angle of the rear seat.
The vehicle seat apparatus according to claim 1, wherein the seat state control means moves the front seat forward when the target seating posture cannot be obtained by changing the seating surface angle of the rear seat . In claim 1,
The vehicle seat apparatus according to claim 1, wherein the seating posture determination unit changes the determination criterion of the target seating posture in a direction of increasing when the operation frequency of the seat state changing unit is a predetermined value or more. In claim 1,
A vehicle seat device, comprising: a notifying means for notifying an occupant when the operating frequency of the seat state changing means is a predetermined value or more.

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