JP2000185583A - Automatic headrest adjusting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of an apparatus for automatically adjusting a headrest position according to a seat position. SOLUTION: This automatic headrest adjusting apparatus detects a position of a longitudinally sliding seat 1 by a slide position sensor, counts and stores the seat position based on the information from the slide position sensor, and adjusts the height of a headrest 4 supported on a seat back 3 according to the longitudinal position of the seat 1. In such an automatic headrest adjusting apparatus, a movable range of the seat is stored, and initialization areas FMST- FRST, RRST-RMST are set within the movable range. More specifically, the initialization areas FMST-FRST, RRST-RMST extend over a prescribed distance from respective endpoints FMST, RMST of the movable range. Moreover, a state of a motor for driving the seat 1 is detected based on the information from the slide position sensor. When the seat position is within the initialization areas FMST-FRST, RRST-RMST while the motor is locked, zero-adjustment of the seat position is conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic headrest adjusting device for automatically adjusting the height of a headrest supported by a seatback in accordance with a seat moving in the front-rear direction.

[0002]

2. Description of the Related Art Conventionally, in a vehicle, in order to adjust the height of a headrest of a seat to the position of a head of a seated person, the height of the headrest is adjusted according to the sliding state of the seat. No. 6,086,045. The device disclosed in this publication has a pressing member for urging the headrest upward, and the headrest is acted upon by the pressing member by sliding the seat cushion and the seat back from the rearmost portion to the frontmost portion. It has a connecting means for connecting the headrest and the vehicle body side so as to pull downward in opposition.

[0003] At present, a so-called memory sheet capable of storing a seat position at a desired position suitable for the body shape according to the body shape of a seated person has been put to practical use. In the case of such a device, in particular, in order to detect the sliding position of the seat or the headrest position, a position sensor including a Hall IC is provided, and the moving end point is detected.
In the configuration in which detection is performed based on the pulse count from the moving end point, recognition of the moving end point is performed by locking the slide motor or the headrest motor (the pulse from the position sensor is interrupted for a predetermined time).

[0004]

However, the sensor pulses from the position sensors for detecting the seat position and the headrest position are not limited to the play of the slide mechanism for sliding the seat, the play of the height adjustment mechanism for moving the headrest up and down, noise, and the like. May cause a counting error, so the position data is updated at the moving end point (zero adjustment)
There is a need to.

If a motor lock (interruption of a sensor pulse) is detected at a position other than the moving end point due to a foreign object being caught (sandwiched) or a failure of the motor or sensor, the position is erroneously recognized as the moving end point. For this reason, the seat position or the headrest position is operated to a position that is not the optimum height, and the reliability is not good.

Accordingly, the present invention has been made in view of the above problems, and it is a technical object of the present invention to improve the reliability of a device in which a headrest position is automatically adjusted according to a seat position.

[0007]

The technical means taken to solve the above problem is to detect the position of a sheet to be slid back and forth by a slide position sensor, and to detect the position of the sheet based on information from the slide position sensor. In a headrest automatic adjustment device that counts and stores the position and adjusts the height of a headrest supported by a seatback in conjunction with the front and rear position of the seat, the movable range of the seat is stored and the end point (front end point) of the movable range is stored. , A rear end point), an initial setting area is provided within a range of a predetermined distance, and the state of the motor driving the sheet is detected based on information from the slide position sensor. Adjusted the seat position to zero.

According to this, when the motor is locked, if the seat position is in the initial setting area, the zero adjustment of the seat position is performed, so that the zero adjustment is performed from the end point (front end point, rear end point) of the movable range. Only when the sheet position is within the limited area of the predetermined distance, the operation is performed assuming that the end point has been reached, so that the foreign object can be caught (sandwiched) in the movable range other than the initial setting area, and the slide motor or the like can be used. When the motor lock is detected due to the failure of the slide position sensor, the zero point adjustment is not performed and the zero point adjustment is performed only in a limited range from the end point, so that the accuracy of the zero point adjustment is improved and the reliability is improved. The initial setting area includes stroke errors of a slide mechanism that slides a seat or a height adjustment mechanism that adjusts the height of a headrest, a pulse error of a slide position sensor that detects a seat position, and a pulse error of a headrest position sensor that detects a headrest position. Shall be set based on

In this case, the initial setting area is provided on both sides of the end point of the movable range, and if the other end point in the movable range is also corrected at the time of zero point adjustment, the zero point adjustment of both end points of the movable range can be performed simultaneously. .

In addition, a headrest position sensor for detecting a headrest position of the headrest is provided, a movable range of the headrest is stored, and an initial setting area is provided within a predetermined distance from an end point (upper end point, lower end point) of the movable range. The state of the motor that drives the headrest is detected based on the information from the headrest position sensor, and if the headrest position is in the initial setting area when the motor is locked, the zero adjustment of the headrest position is performed. Is performed only when the headrest position is within a limited area of a predetermined distance from the end point (upper end point, lower end point) of the headrest. Zero point when motor lock is detected due to failure of motor or headrest position sensor Integer is not performed, because only the zero point adjustment in a limited range from the end point is performed, the accuracy of the zero-point adjustment from the malfunction due to the movement end point misrecognition is prevented is improved, thereby improving the reliability.

Further, if the current seat position or the headrest position is compared with the stored end point information of the movable range of the slide or the headrest and the end point is updated, the end point can be corrected. In other words, even if the current position data at the end point deviates from the initial setting area due to a pulse count error or the like at the end point, it is possible to move the initial setting area so that the moving end point is always within the initial setting area. Become.

When the zero adjustment of the seat position is performed, the zero adjustment of the headrest according to the movable direction of the seat (the direction in which the seat is moved based on the state where the operation switch for moving the seat is pressed) is also driven. By detecting when the motor is locked, the headrest is forcibly moved to the end point at the time of zero adjustment of the seat position, and the zero adjustment of the seat position and the headrest position can be performed simultaneously.

When the motor lock is detected outside the initial setting area, if the automatic adjustment of the headrest is stopped,
Malfunctions such as the headrest being moved to a position other than the optimum height at the time of abnormality and after the abnormality is repaired are prevented.
Thereafter, the automatic adjustment of the headrest can be restarted only when the motor lock is detected in the initial setting area.

If the slide manual switch is operated while the headrest is not automatically adjusted, a warning sound is issued to notify that the initial setting operation (manual operation to the moving end point) is required. It is also possible.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a vehicle seat (hereinafter referred to as a seat).
1 shows a configuration of a seat 1, wherein the seat 1 includes a seat cushion 2, a seat back 3, and a headrest 4. The seat 1 is supported on a vehicle floor (not shown) via a well-known slide adjusting mechanism 5 arranged below the seat section 2 so as to be movable in a longitudinal direction of the vehicle (a direction indicated by an arrow) which is a longitudinal direction of the vehicle. .

The seat back 3 is disposed at the rear of the seat cushion 2 so as to provide a backrest for the occupant. The headrest 4 is provided above the seat back 3 via a well-known height adjusting mechanism 6 in the vehicle vertical direction. It is movably supported in the direction.

The slide adjusting mechanism 5 has a lower rail 51 fixed to the vehicle floor and an upper rail 52 fixed to the seat cushion 2 and slidably supported along the lower rail 51. The upper rail 52 slides with respect to the lower rail 51 by the operation of a well-known drive mechanism 7 including a screw shaft, a nut member, a reduction gear structure, and a slide motor 71. Thereby, the sheet 1 moves along the sheet longitudinal direction (the direction of the arrow), and the sheet 1
The front and rear position adjustment is made.

The height adjusting mechanism 6 has a stay 61 slidably supported by a holder attached to the headrest 4 and attached to the seat back 3.
1 is a well-known drive mechanism 8 including a screw shaft, a nut member, a reduction gear structure, and a headrest motor 81.
Slides on the holder. This allows
The headrest 4 moves along the seat height direction (the direction of the arrow), and the vertical position of the headrest 4 is adjusted.

FIG. 2 shows the internal structure of the control device 9 and the control device 9.
Shows the state of external connection. The slide motor 71 of the drive mechanism 7 and the drive mechanism 8 are transmitted to the CPU 91 which controls the control device 9 via a forward rotation circuit 92 and a reverse rotation circuit 93.
Headrest motor 81 is connected. Also, C
A slide manual switch 72 for driving and operating the slide motor 71 and a headrest manual switch 82 for driving and operating the headrest motor 81 are connected to the PU 91 via an input processing circuit 94.

The slide manual switch 72 includes a front adjustment switch (hereinafter, referred to as slide FrSW) 72a and a rear adjustment switch (hereinafter, slide Rr).
SW 72b). This slide F
rSW72a and slide RrnSW72b are respectively
It is a normally-open type switch, which is always off and turned on only while being pressed.

The headrest manual switch 82 is
An up-adjustment switch (hereinafter, referred to as a headrest UpSW) 82a and a down-adjustment switch (hereinafter, referred to as a headrest DwSW) 82b are provided. The headrest UpSW82a and the headrest DwnS
W82b is also a normally open type switch,
It is off and turns on only while pressed, and CP
U91 is provided with a slide motor 7 for moving the vehicle seat 1 forward when the slide FrSW 72a is turned on.
A slide drive signal is output to the forward rotation circuit 92 to drive the sheet 1 in the forward direction, and the reverse rotation circuit 93 is driven to drive the slide motor 71 in the reverse direction to move the seat 1 backward when the slide RrSW 72b is on. Outputs a slide drive signal. In addition, headrest UpSW82
A headrest drive signal is output to the normal rotation circuit 92 to drive the headrest motor 81 in the normal direction in order to move the headrest 4 upward when a is turned on, and the headrest 4 is moved downward when the headrest DwnSW 82b is turned on. Headrest motor 81 for
Is output to the reverse rotation circuit 93 in order to drive the headrest in the reverse direction.

Further, the CPU 91 is connected via a position detecting circuit 95 to a slide position sensor 73 for detecting the front and rear position of the seat 1 and a headrest position sensor 83 for detecting the vertical position of the headrest 4. The slide position sensor 73 includes a Hall element and is provided in a slide adjustment mechanism. The slide position sensor 73 is of a pulse counting type that counts drive pulses in accordance with the driving of the slide motor 71. The current position (arbitrary movement position) of the seat 1 is recognized based on the signal (absolute position based on the front most position). The headrest position sensor 83 is also provided with a Hall element, is provided in the height adjustment mechanism, and is of a pulse counting type that counts the number of driving pulses as the headrest motor 81 is driven. The current vertical position (arbitrary position) of the headrest 4 is calculated based on the pulse signal from the sensor 83 (absolute position based on the downmost position).

Further, a storage circuit 96 is connected to the CPU 91, and the storage circuit 96 stores information necessary for adjusting the seat position and the headrest position. Headrest 4
The characteristic map in which the target vertical position (target moving position) is set is stored. The target vertical position of the headrest 4 in this characteristic map is obtained from average body shape data (height, sitting height, etc.) of a person (seated person) sitting on the seat 1. In this case, a dead zone can be provided in the characteristic map with reference to the target headrest vertical position.

Next, the processing of the CPU 91 in the control device 9 will be described with reference to the flowcharts of FIGS. When power is supplied to the control device 9 from a battery or the like, the CPU 91 executes a program (main routine) shown in FIG. In FIG. 3, a CPU 91
When the power is turned on, initial processing is first performed in step S101. In this initial processing, RO
The states of the M and RAM are checked, the initial values are set in the memory required for this processing, and thereafter, it is checked whether the system operates normally. Then, step S
At 102, signals from a slide position sensor 73 for detecting the position of the seat position and a headrest position sensor 83 for detecting how high the headrest is are received via a position detection circuit 95. The waveform is shaped and pulses are input, and the input signals are stored in necessary memories for storing states. In step S103, slide and headrest manual switches 72, 8
2 is detected from the signal state, and the operation state at that time is input to the memory.

In step S104, a position calculation process is performed. This position calculation process is shown in FIG. 4. The process here will be described briefly. When the motor lock state of the slide motor 71 and the headrest motor 81 is detected from the interruption of the sensor pulse, the seat 1 and the headrest In the case of being within the initial setting area in the movable region of No. 4, the zero point adjustment (update) of the end point information stored during the sliding operation and the headrest operation is performed.

In step S201 of FIG.
Headrest current position calculation processing is performed. This is due to the fact that the slide position sensor 73 outputs C
If the slide manual SW 72 is pressed to the Fr side in response to the pulse signal input to the PU 91 (the slide Fr SW 72a is in the ON state), the slide position counter for storing the sheet state is incremented, and the slide manual SW 72 is pressed to the Rr side. If the slide RrSW 72b is on, the slide position counter is decremented and the current sheet position is stored.

Similarly, the headrest position sensor 83
The headrest manual SW 82 responds to a pulse signal input from the
Is pressed to the Up side (the headrest UpSW82).
a), the headrest position counter for storing the headrest state is incremented. If the headrest position counter is pushed to the Dwn side (the headrest DwnSW82b is in the on state), the headrest position counter is decremented.
The current headrest position is stored.

Here, before describing the processing after step S202, the information (information regarding the position of the slide and the headrest) stored in advance by the CPU 91 will be described with reference to FIG. The seat 1 has a movable range (FMST to RMS) that slides back and forth in the design stage.
T: Here, the slide stroke 260 mm is set in advance and is known, and this movable range (FMST to RM)
ST) from the front end point FMST (Fr most) and the rear end point RMST (Rr most) (the play of the slide adjustment mechanism 5 and the slide position sensor 73).
Distance determined by the sensor pulse error from
(For example, 18 mm) within the initial setting area (FMST).
To FRST, RRST to RMST), and within this range, an area in which memory update accompanying zero point adjustment is permitted is set.

The movable range in which the headrest 4 moves up and down (UMST to DMST: here, the headrest stroke is 75 mm) is preset and known, and the upper end point UMST (upmost) and the lower end point DMST ( Initially, the memory update accompanying the zero point adjustment is permitted within a range of a predetermined distance (a play distance of the height adjustment mechanism 6 and a distance determined by a sensor pulse error from the headrest position sensor 83, here, for example, 5 mm) from the (down-most). Setting area (UMST to URS
T, DRST to DMST) are stored in the memory of the control device 9.

Therefore, returning to FIG. 4, it is determined in step S202 whether the slide operation is being performed. Here, when the slide operation is not being performed (during stop), step S215 is performed.
Move on to However, when the seat 1 is being operated in the Fr direction (the slide FrSW 72a is in the ON state), step S2 is executed.
03, and is operating in the Rr direction (slide RrS
If W72b is ON, the process moves to step S209.

(If the slide Fr direction operation is being performed) In step S203, it is checked whether the current slide position data (the value of the slide position counter) is larger than the end point data (Frmost). If the current slide position data, which is the value of the slide position counter, is larger than the value of Fr-Most, the process proceeds to step S207. If not, the process proceeds to step S204.

If the slide current position data, which is the value of the slide position counter, is not larger than the end point data in step S203 (range FMST to RMST),
In step S204, it is checked whether the pulse from the slide position sensor 73 has been interrupted for a predetermined time (200 ms). That is, the predetermined time (200 ms)
That the slide sensor pulse was interrupted during
That is, the slide motor 71 cannot move while the sheet position is moving to the end point, or
This indicates whether or not a foreign object has been caught (sandwiched) or the like and the motor has been locked. Therefore, step S20
In the state where the pulse from the slide position sensor 73 is output in step 4, the slide motor 71 is considered to be operating normally, and the process proceeds to step S215.
ms) In the case of interruption, the current slide position data (the value of the slide position counter) is present in the initial setting area (FMST to FRST) in step S205 in order to check at which sheet position the pulse is interrupted. Is checked. If the sheet position is not within the initial position setting area (the sheet position is FRST to RMST), it is assumed that the sheet position is not at the end point in this state, and the end point is not updated.
If there is a current slide position in T), step S20
In step 6, an initialization down operation request flag is set. Thereafter, assuming that the sheet 1 has moved and the sheet position has moved to the slide front end point, the zero adjustment of the sheet position end point is performed in step S207, and the other end point R of the movable range is adjusted in step S208.
The value of r-moost is also updated.

(If the slide Rr direction operation is being performed) In step S209, it is checked whether the current slide position data (the value of the slide position counter) is smaller than the end point data (Rr most). If the current slide position data, which is the value of the slide position counter, is smaller than the value of the Rr mode, the process proceeds to step S213, but the process proceeds to step S209.
In the case where the slide current position data, which is the value of the slide position counter, is equal to or larger than the end point data (FMST to RM
(ST range), it is checked in step S210 whether the slide sensor pulse has been interrupted for a predetermined time (200 ms). That is, the slide motor 71
Is unable to move while the sheet position is moving to the end point, or is caught by a foreign object (pinching)
It is checked whether or not the motor lock state has occurred due to the occurrence of an error. In step S210, the slide position sensor 73
In a state in which the pulse from is output, the slide motor 71 is considered to be operating normally, and
If the pulse from the slide position sensor 73 has been interrupted for a predetermined time (200 ms), the current slide position data is stored in the initial setting area in step S211 to check at what sheet position the pulse is interrupted. (RRST to RMST) is checked. If the current position is not within the initial position setting area (the sheet position is FMST to RRST), the end point is not updated in this state because it cannot be regarded as an end point, but the current slide position is set within this area (RRST to RMST). If there is, an initial setting up operation request flag is set in step S212. Thereafter, assuming that the sheet 1 has moved and the sheet position has moved to the slide trailing end point, zero adjustment of the sheet position end point (Rr most) is performed in step S213, and the other end point Fr most is adjusted in step S214. Is also updated.

That is, steps S207, S208, S
At 213 and S214, the end point on the operation side (Fr or Rr) is determined by the sensor pulse input of the slide position sensor 73 based on the operation state of the slide manual SW 72, and the motor lock of the slide motor 71 is determined. In this case, the zero point adjustment of the end point is performed, and the end point in the direction opposite to the moving side is obtained by calculation and updated at the same time.

In the next step S215, the headrest 4
If the headrest manual SW 82 is not operated (stopped), this process is terminated. If the headrest manual SW 82 is operating (the headrest UpSW 82a is in the on state), step S is executed.
216, and if the Dwn direction operation is being performed (the headrest DwnSW82b is in the ON state), the process proceeds to step S221
Execute

In the case where the headrest is operating in the Up direction, in step S216, it is checked whether the current headrest position data (the value of the headrest position counter) is larger than the end point data (upmost), and the current headrest position data which is the value of the headrest position counter is checked. Is larger than the value of the up-mode, the slide position counter exceeds the end point information and thus does not have a normal counter value. Therefore, in step S219, the current position is set to the up-mode and updated, and step S220 is performed. In, the end point opposite to the up mode in the operation direction is calculated from the up mode and the full stroke amount, zero-point adjustment of both end points is performed, and this processing ends.

On the other hand, if the headrest current position data is less than the end point data (range from UMST to DMST), it is checked in step S217 whether the pulse of the headrest position sensor 83 has been interrupted for a predetermined time (200 ms). . Headrest position sensor 8 for predetermined time
The fact that the pulse of the pulse No. 3 has been interrupted means that the headrest 4 cannot be moved while the headrest 4 is moving to the upper end point, or that the headrest motor 81 Indicates whether the lock state has been reached. In a state where the pulse from the headrest position sensor 83 is output in step S217, it is considered that the headrest motor 81 is operating normally, and this processing ends. (200ms)
If the headrest has stopped, the current position data of the headrest is stored in the initial setting area (UMST) in step S218 in order to check at which headrest position the headrest is stopped.
... URST). If the headrest position is not within the initial position setting area (the URST
To DMST), the end point is not updated because it cannot be regarded as an end point. However, if the current position of the headrest 4 is present in this area (UMST to URST),
Has been moved to the moving end point, and
In step S9, the zero point of the end point of the headrest position is adjusted, and in step S220, the value of the downmost point, which is the other end point, is also updated.

(During operation of headrest Dwn direction)
In step S221, it is checked whether the headrest current position data (the value of the headrest position counter) is smaller than the end point data (downmost). If the current slide position data is smaller than the downmost value, the headrest position counter is set to a normal counter. Since the value is not a value, the current position is set to the down mode in step S222 and updated. In step S223, an end point (up mode) opposite to the down mode is calculated from the down mode and the full stroke amount. Is performed, and the process ends.

On the other hand, when the headrest current position data, which is the value of the headrest position counter, is equal to or larger than the end point data (downmost) (range from UMST to DMST),
In step S224, the headrest position sensor 8
It is checked whether the pulse No. 3 has been interrupted for a predetermined time (200 ms). That is, the headrest motor 8
It is checked whether or not movement cannot be performed while the device 1 is moving to the end point of the headrest position, or whether the motor lock state has occurred due to a foreign object biting or the like.
In step S224, the headrest position sensor 83
When the pulse is output from the headrest motor 81, it is considered that the headrest motor 81 is operating normally, and this processing ends. However, when the pulse from the headrest position sensor 83 is interrupted for a predetermined time (200 ms). In step S225, it is checked in step S225 whether the headrest current position data is within the initial setting area (DRST to DMST). If the headrest position is not within this initial position setting area (the headrest position is UMST to DRST), it cannot be regarded as an end point, and the end point is not updated. However, if the headrest current position is within this area (DRST to DMST), Assuming that the headrest 4 has moved and has moved to the movement end point, zero adjustment of the headrest position end point is performed in step S222, and step S222 is performed.
In 223, the value of the upmost point, which is the other end point, is also updated, and the position calculation processing ends.

That is, steps S219, S220, S
At 222 and S223, the headrest manual SW 82
According to the operation state of the above, the end point on the operation side (Up or Dwn) is determined to be the motor lock of the headrest motor 81 by the sensor pulse input of the headrest position sensor 83, and the zero adjustment of the end point is performed when the headrest position is in the initial setting area of the headrest. At the same time, the end point in the direction opposite to the moving side is obtained by calculation and updated at the same time.

Thereafter, the flow returns to step S105 in FIG.
In step S105, the target height of the headrest is calculated. In this process, the headrest target vertical position that is the optimum height for the average occupant is determined according to the position of the seat from the slide position sensor 73 before and after the seat. It is calculated by the characteristic map shown in FIG. Then, after the target height of the headrest 4 is calculated based on the front-back position of the seat, the headrest automatic adjustment process is performed in step S106, and the process returns to step S102 to repeat the process from step S102 to step S106 at a predetermined cycle. .

In the headrest automatic adjustment process, as shown in FIG. 5, in step S301, it is checked whether the headrest manual switch 82 is operated. Here, when the headrest manual switch 82 is operated, the headrest manual operation process is performed in step S302, and the CPU 91 outputs an output according to the pressed SW state, and sets the headrest 4 to the state of the manual switches 82a and 82b. Move upward or downward as appropriate. If the headrest manual switch 82 is not operated in step S301, the slide manual switch is switched in step S303.
It is checked whether 72 has been operated. Here, when the slide manual SW 72 is operated,
In step S304, a slide manual operation process is performed. Here, the CPU 91 outputs an output to the forward / reverse rotation circuits 92 and 93 according to the SW state of the pressed side, and moves the seat 1 in the front-rear direction.

On the other hand, in step S303, the slide manual SW 303 is not operated (the headrest manual SW 82 and the slide manual SW 72).
If both are not operated), step S305 is executed. Here, whether there is an initialization operation request is determined based on whether an up request or a down request of the initialization operation request flag is set. If there is no request for the initial setting operation, map data of the headrest target height with respect to the current slide position is read in step S306, and the current position of the headrest 4 is compared with the target height in step S307. If the current position is smaller than the target height, an up command is output to the headrest motor 81 to adjust the height of the headrest 4 to the target height in step S308, and the height of the current position of the headrest 4 is set to the target height. If it is larger than the height, a down command is output to the headrest motor 81 in step S310. If the height of the headrest 4 has reached the target height obtained from FIG.
Stop output to. By performing such processing at regular intervals, control is performed so as to obtain an optimal headrest height in accordance with the front and rear sliding positions of the seat 1.

On the other hand, if there is an initial setting down request in step S305 (a state in which the initial setting down operation request flag is set), a request to lower the headrest motor 81 is sent to the CPU 9 in step S312.
1 is output to lower the headrest motor 81.
If an initial setting up request has been made (the initial setting up operation request flag is set), the CPU 91 outputs a request to turn up the headrest motor 81 in step S311, and causes the headrest motor 81 to go up.

Thereafter, in step S313, the sensor pulse from the headrest position sensor 83 is output for a predetermined time (20
0 ms) It is checked whether the sensor pulse has been interrupted. If the sensor pulse has not been interrupted for a predetermined time (200 ms), it is determined that the headrest motor 81 is operating normally, and the process at the time of motor lock is not performed. When the sensor pulse is not input to the CPU 91 for a predetermined time (200 ms) (the pulse is interrupted), it is regarded that the sensor has moved to the moving end point, and the initial setting operation request flag is set to both the up request and the down request in step S314. After clearing, the headrest motor 81 is stopped in step S315.

In this case, if the headrest motor 81 is stopped when the motor is abnormal, it is possible to prevent an erroneous operation in which the headrest 4 moves to a position other than the optimum height after the abnormality is recovered. If the manual switches 72 and 82 are operated while the headrest automatic adjustment function is stopped, a notification is made by buzzer, warning, voice synthesis, etc., and an initial setting operation such as a manual operation to the moving end point is performed. It is also possible to inform the occupant of what is necessary.

[0048]

According to the present invention, the zero point adjustment of the seat position is performed when the seat position is in the initial setting area when the motor is locked, so that the zero point adjustment is limited to a predetermined distance from the end point of the movable range. Only when there is a sheet position in the area, the operation is performed assuming that the end point has been reached. Therefore, when a foreign object is caught (pinched) in the movable range other than the initial setting area or the slide motor or the slide position sensor is broken, When the motor lock is detected, the zero point adjustment is not performed, and the zero point adjustment is performed only in a limited range from the end point, so that the accuracy of the zero point adjustment is improved and the reliability is improved.

In this case, the initial setting areas are provided on both sides of the end point of the movable range, and if the other end point in the movable range is also corrected at the time of zero point adjustment, the zero point adjustment of both end points of the movable range can be performed simultaneously. .

Further, since the zero point adjustment is performed only when the headrest position is within a limited area of a predetermined distance from the end point of the movable range, foreign matter can be caught (caught) in the movable range other than the initial setting area. ) Or when the motor lock is detected due to the failure of the headrest motor or the headrest position sensor, the zero adjustment is not performed, and the zero adjustment is performed only in a limited range from the end point, thereby preventing a malfunction due to erroneous recognition of the moving end point. Therefore, the accuracy of the zero adjustment is improved, and the reliability is improved.

Further, if the current seat position or the headrest position is compared with the stored end point information of the movable range of the slide or the headrest to update the end point, the end point can be corrected. That is, even if the current position data at the end point deviates from the initial setting area due to a pulse count error at the end point or the like, the initial setting area can be moved so that the moving end point is always within the initial setting area.

When the zero adjustment of the seat position is performed, the zero adjustment of the headrest according to the moving direction of the seat is also performed by detecting the time when the motor for driving the headrest is locked. The headrest can be forcibly moved to an end point, and zero adjustment of the seat position and the headrest position can be performed simultaneously.

When the motor lock is detected outside the initial setting area, if the automatic adjustment of the headrest is stopped,
Malfunctions at the time of abnormalities and after abnormal repairs can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a seat of an automatic headrest adjustment device according to an embodiment of the present invention.

FIG. 2 is an internal configuration and an external connection diagram of a control device of the headrest automatic adjustment device according to the embodiment of the present invention.

FIG. 3 is a flowchart illustrating a process of the automatic headrest adjustment device according to the embodiment of the present invention.

4 is a flowchart of the position calculation process shown in FIG.

FIG. 5 is a flowchart of a headrest automatic adjustment process shown in FIG. 3;

FIG. 6 is a diagram showing a stroke amount stored in a memory of a headrest automatic adjustment device and a state of an initial setting area from a moving end point according to an embodiment of the present invention.

FIG. 7 is a characteristic map for obtaining a headrest target vertical position from a seat front-back position of the automatic headrest adjusting device according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 3 Seat back 4 Headrest 71 Slide motor (motor) 72 Slide manual SW 73 Slide position sensor 81 Headrest motor (motor) 82 Headrest manual SW 83 Headrest position sensor FMST-FRST, RRST-RMST Initial setting area UMST- URST, DRST to DMST Initial setting area

Claims (6)

[Claims] 1. A sheet position of a sheet to be slid back and forth is detected by a slide position sensor, the sheet position is counted and stored based on information from the slide position sensor, and the sheet is linked with the front and rear position of the sheet. In a headrest automatic adjustment device that adjusts the height of a headrest supported by a back, the movable range of the seat is stored, and an initial setting area is provided in a range of a predetermined distance from an end point of the movable range. An automatic headrest adjustment device, comprising: detecting a state of a motor that drives the seat based on information; and performing zero adjustment of the seat position when the seat is located in an initial setting area when the motor is locked. 2. The headrest automatic adjustment device according to claim 1, wherein the initial setting area is provided on both sides of an end point of the movable range, and the other end point in the movable range is also corrected at the time of zero point adjustment. 3. A headrest position sensor for detecting a headrest position of the headrest, a movable range of the headrest is stored, an initial setting area is provided within a predetermined distance from an end point of the movable range, and a headrest position sensor is provided. 3. The headrest automatic control according to claim 2, wherein a state of a motor for driving the headrest is detected based on the information of the headrest, and a zero adjustment of the headrest position is performed when the headrest position is in an initial setting area when the motor is locked. Adjustment device. 4. The headrest automatic adjustment device according to claim 3, wherein the end point is updated by comparing the current seat position or the headrest position with the stored end point information of the movable range of the slide or the headrest. 5. The headrest according to claim 3, wherein when the zero adjustment of the seat position is performed, the zero adjustment of the headrest according to the moving direction of the seat is also performed by detecting a motor lock time of a motor that drives the headrest. Automatic adjustment device. 6. The headrest automatic adjustment device according to claim 3, wherein the automatic adjustment of the headrest is stopped when a motor lock is detected outside the initial setting area.