JPH02258436A - Head rest control system and head rest control device - Google Patents

Abstract

PURPOSE:To assure the safe storage action by storing a head rest when no occupant is detected by an occupant detecting means provided on a seat cushion and no obstacle is detected by an obstacle detecting means housed in the head rest. CONSTITUTION:When the manual switch of a storage switch means 12 is turned on at the support position of a head rest 26, a rotating motor 22 is reversely rotated by a CPU 20, and the head rest 26 is rotated from the support position and stored to the storage position. A head rest control device has a occupant detecting means 16 detecting the present of an occupant on a seat and an obstacle detecting means 18 detecting the presence of an obstacle on the seat. When no occupant and no obstacle of the seat are detected by the detecting means 16 and 18, the drive of the rotating motor 22 is allowed by the on-operation of the above manual switch, and the head rest 26 can be rotated to the storage position.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a headrest control system and headrest control that secures the driver's rear visibility and the passenger's front view of the rear seat by avoiding moving the headrest to the storage position. Regarding equipment.

[Conventional technology]

For example, a headrest is disposed at the upper end of the seat back of various automobile seats, such as passenger car seats. This kind of headrest supports the head of the seated person and, in the event of a car collision, restricts the backward movement of the seated person's head relative to the torso, thereby reducing injuries to the groin area. It has a securing function. Also,
Under normal circumstances, a headrest stabilizes the head of a seated person, thereby helping to maintain an optimal posture that does not cause fatigue.

In such a headrest, for example, a headrest is provided in which the driver or a person sitting in the rear seat can operate a manual switch to retract the headrest from a support position to the rear visibility line or below the front visibility line. .

According to such a headrest, by operating a manual switch, the rear seat headrest 1- and the headrest of the front passenger seat are retracted below the respective rear and front visibility lines.

Therefore, the rear view of the driver when driving in reverse and the forward view of the person sitting in the rear seat during normal driving can be ensured without being obstructed by the respective headrests.

Here, in such a headrest, a configuration is known that includes a seating detection means that detects the presence or absence of a person sitting on the rear seat or passenger seat and restricts the retraction of the headrest in response to the presence or absence of a person sitting.

Such seating detection means, for example, includes a switch in the belt anchor that is turned on by inserting the tongue of the seat belt into the belt anchor, and detects whether or not a person is seated by turning the belt anchor switch on and off. Configured to be discoverable.

Furthermore, a configuration in which a seating switch is provided within a seat cushion is also known. As a seating switch, for example, a pressure type (weight type) switch that detects the presence or absence of a seated person based on the weight of the seated person, or a capacitance type switch that detects the presence or absence of a seated person based on changes in capacitance caused by the human body, etc. are used. has been done.

According to the configuration including the seating detection means as described above, the headrest can be retracted only when there is no occupant,
When a person is seated, even if a manual switch or the like is operated by mistake, the headrest will not be retracted, thus maintaining the safety of the person seated.

[Problem to be solved by the invention]

As described above, in the known headrest control system, the safety of the seat occupant is ensured by detecting the presence or absence of a seated person using a seat detection means including a belt anchor switch, a seat switch, and the like.

However, in a configuration in which the presence or absence of a seat occupant is detected using a belt anchor switch, the presence of a seat occupant is detected only when the seat belt is fastened. In other words, in the case of a pregnant woman or the like who is not required to wear a seatbelt, the presence of a seated person cannot be detected because the belt anchor switch is not operated. Furthermore, since people sitting in the rear seats often do not wear their seat belts, it becomes very difficult to detect the people sitting in the rear seats.

Further, in a configuration using a seating switch such as a pressure type switch or a capacitance type switch, when the seated person sits on the seat, the seated switch is turned on and the presence of the seated person is detected. However, with pressure switches, depending on the seated person who is light in weight such as a child, or the sitting position,
A seated person may not be detected. Furthermore, even when luggage or the like is placed on the seat cushion, the pressure switch is turned on, so there is a risk of making an incorrect decision.

On the other hand, capacitive switches make judgments based on the capacitance that changes with the high dielectric constant of the human body, so they are reliably activated and turned on for a seated person, and changes in capacitance are not caused by changes in capacitance compared to the human body. Capacitive switches do not work for loads that vary widely. Therefore, even when luggage is placed on the seat cushion, the headrest is rotated toward the storage position. However, even when a large object is loaded, such as a object that is higher than the storage position of the headrest, the headrest still rotates in the storage direction, so the object prevents the headrest from rotating during the rotation in the storage direction. . In such a case, since the headrest is still rotating in the storage direction, the limit switch etc. will not operate and the motor will continue to drive.
There is a risk that the motor will generate heat due to overload.

The present invention provides a headrest control system and headrest that reliably detects the presence or absence of a person sitting on a rear seat or passenger seat, and the presence or absence of a harmful object in the direction in which the headrest is retracted, thereby ensuring the safety and comfort of the occupant. The purpose is to provide a control device.

[Means to solve the problem]

In order to achieve this object, the headrest control system of the present invention detects the presence or absence of a seated person by means of the occupancy detection means provided in the seat cushion, and detects the presence or absence of an occupant on the seat by means of the The presence or absence of obstacles is detected. Then, when there are no obstacles and a signal is output in the direction of retracting the headrest, the headrest rotates to the retracted position below the line of sight of the person sitting on the other seat, and The vehicle is configured to ensure a front view or a rear view of the person.

Further, when an obstacle is detected when the headrest is rotated in the storage direction, the headrest is configured to immediately stop retracting.

〔Example〕

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

As shown in FIG. 1, a headrest control device 10 according to the present invention includes a storage switch means 12, an adjustment switch means 14, a seating detection means 16, an obstacle detection means 8, and a central processing unit 20. Equipped with The headrest control device 10 further includes a rotation motor 22 and a lifting motor 24, and can control the storage, return, front-back position, and vertical position of the headrest 26 by driving each of the rotation motor and the lifting motor. It is composed of

As the rotation motor 22 and the lifting motor 24, for example, D
C gear motors can be used, and by driving each motor, the headrest 26 rotates between the support position and the storage position, or moves up and down at the support position (
(See Figures 3, 4, and 5).

The headrest 26 supports the head of the seated person between the normal support position (initial support position) shown in FIG. 3 and the support upper limit position shown in FIG. 5, for example, and prevents the head from moving backward in the event of a collision. prevent.

In addition, in the storage position shown in FIG. 4, for example, in the case of the headrest 2G on the rear seat, the headrest 2G can be rotated below the so-called rear visibility line 28, which connects the driver's line of sight with the lower edge of the rear window or the edge of the rear bonnet. However, by moving the headrest to the retracted position, the driver's rear visibility is secured (see Figure 1).

As shown in FIG. 1, the storage switch means 12 is provided at a position that can be operated by the driver, for example, on an armrest 32 formed integrally with the inner wall of the front door 30. Then, the drive of the rotation motor 22 and the lifting motor 24 is controlled respectively, and the storage position of the headrest 26 is adjusted.
The support position can be set with one touch. However, the storage switch means 12 is not limited to the armrest 32, and may be arranged on other members, such as a console box. As shown in FIG. 2, as the manual switch 34 of the storage switch means 1z, for example,
An automatic return type pushbutton switch that returns to its initial position when the push force is removed can be used, and a manual switch is connected to the central processing unit 20. Then, when the manual switch 34 is operated, the signal is transmitted to the central processing unit 2.
Output to 0.

The central processing unit 20 is formed with a microcomputer 36 which processes inputs and generates appropriate control signals according to stored programs. As can be seen from FIG. 2 in addition to FIG.
is output to control the drive of the rotation motor 22.

Here, the manual switch 3 of the storage switch means 12
4 is configured in a one-touch manner. For example, when the manual switch 34 is turned on, the memory function is activated and the switch operation is memorized. Even if the manual switch 34 is turned off while the rotary motor is being driven, the rotary motor continues to be driven by the memory function. In such a configuration, it is sufficient to turn on the manual switch 34 once, so the manual switch can be easily operated.

In addition, as shown in FIG. 2, for example, the headrest 2
Headrest position detection means 40 is provided to detect the position of 6 and limit the rotation range. As the headrest position detection means 40, for example, a potentiometer 41 that can measure the rotation angle of the rotary motor 22 and detect the position of the headrest 26 based on the measured value can be used. As shown, it is connected to the central processing unit 22 t.20. The central processing unit 20 is configured to determine whether the headrest should be retracted or restored at any time depending on the position of the headrest 26.

In such a configuration, for example, in the supporting position of the headrest 26 shown in FIG.
When turned on, the central processing unit 20 confirms the position of the headrest based on the signal from the button meter 41 of the headrest position detection stage 40. When it is confirmed that the headrest 26 is in the supporting position, a rotation (reverse rotation) signal is output to the rotation motor control relays 38 and 39 to switch the relay contacts 3δa and 39a. By this switching, the rotation motor 22 is driven in the reverse direction,
The headrest 26 rotates from the support position to the storage position,
(See Figure 4). Further, for example, when the manual switch 34 is turned on in the retracted position of the headrest 2G shown in FIG.
The central processing unit 20 confirms the position of the headrest based on the signal from the headrest. When it is confirmed that the headrest 26 is in the retracted position, a rotation (normal rotation) signal is output to the rotation motor control relay 3L39 and the relay contact 3
Switch between 8a and 39a. By this switching, the rotary motor 22 is driven in the forward rotation direction, and the edge rest 26 is returned from the storage position to the support position (see FIG. 3).

Further, the adjustment switch means 14 includes, for example, a front-rear adjustment switch 42 and an up-down adjustment switch 44 (see FIG. 2), and adjusts the adjustable position of the person sitting on the rear seat, for example, as shown in FIG. As shown in FIG. 2, the armless i-48 is provided integrally with the inner wall of the rear door 46. As the front-rear adjustment switch 42 and the up-down adjustment switch 44, for example, an automatic return type switch having contacts at two positions, including a neutral position, can be used. However, the invention is not limited to this, and for example, an automatic return type button switch that returns to the initial JUt position when the pressing force is released may be used to adjust the adjustment switch means.
The i post-adjustment switch 42 and the L-down adjustment switch 44 may be configured respectively.

The longitudinal adjustment switch 42 and the vertical adjustment switch 44 of the adjustment switch means are each connected to the central processing unit 20, as shown in FIG. 2, and are operated by, for example, a person sitting on the rear seat 50. When the front and rear adjustment switch 42 and the lower and rear adjustment switch 44 are operated, respective signals are output to the central processing unit 20.

For example, when the front-rear adjustment switch 42 is turned on in the forward direction at the support position of the headrest 26, a forward adjustment signal is input to the central processing unit 20. Then,
Rotation motor control relay 311 from central processing unit 2G
．． A rotation signal is output to 39 and relay contacts 38a, 39
By switching a and switching the relay contact, the rotation motor 22 is driven, and the headrest 26 is rotated 1111 in the rear direction. When the seated person turns off the longitudinal adjustment switch 42 at any position, the relay contacts 311a, 39
a is switched to stop the rotary motor 22 +J=, and arbitrarily set the headrest 26 to a desired support position in the 1111 rear direction between the initial support position shown in FIG. 3 and the adjustment front limit position shown by the two-dot chain line. Can be set.

For example, the initial support position of the headrest 26, adjustment...1
The limit position is detected by the potentiometer 41 and is limited by a set value preset in the central processing unit 20.

Further, for example, when the vertical adjustment switch 44 is turned on in the upward direction at the support position of the headrest 26, an upward adjustment signal is manually input to the central processing unit 20. Then, the central processing unit 20 sends the elevating motor control relay 51 . , 52, a rotation signal is output to the relay contact 51.
a and 52a, and by switching the relay contacts, the lifting motor 24 is driven, and the headless 26 is lifted and lowered. Then, when the seated person turns off the lower adjustment switch 44 in the ``2'' position, the relay contacts 51a and 52a are switched and the lifting motor 24 is stopped, and the initial support position shown in FIG. Adjustment shown in "Adjustment" You can arbitrarily set one desired support position of the headrest 26 in the 7F direction between the two limit positions. For example, the initial support position of the headrest 26 and the eye position required for adjustment are limited by a lift limit switch 53 provided within the headrest I, as will be described later.

Here, as can be seen from FIGS. 1 and 2, the central processing unit 20, rotation motor 22, and lifting motor 24 are as follows:
Each is connected to a power supply circuit 55 equipped with a constant voltage circuit 54, and connected to a battery 5
It is connected to the positive terminal of 8.

Note that reference numeral 59 in FIG. 2 indicates an overcurrent detection resistor that prevents overcurrent from flowing to the rotation motor 22 and the lifting motor 24.

Further, as shown in FIG. 1, the headrest control device 10 of the present invention includes a seating detection means 16 for detecting the presence or absence of a person sitting on the seat, one of the seats L (and an obstacle detecting means for detecting the presence or absence of a harmful object). The seat switch 6o, such as a pressure sensor, can be used as the neck detection means 16, and the seat switch 6o is disposed inside the seat cushion 62 of the rear seat. is connected to the central processing unit 20 (see Figure 2).
.

When the neck switch 6o detects pressure, a signal is output to the central processing unit 71/20, thereby detecting the presence of a seated person on the rear seat 50. Then, when the central processing unit 2o receives a signal from the head seat switch Go and the central processing unit detects that the user is seated on the rear seat 50, the signal from the manual switch 34 is cut off.
It is configured such that only the front/backward adjustment switch 42 and up/down adjustment switch 44 of the adjustment switch means can be operated.

In other words, when sitting in Liang-1-50, even if a signal is output from the storage switch means 12 to the central processing unit 20, the headrest 26 is not retracted, and the headrest can be adjusted back and forth or up and down. Become.

In addition, if the neck switch 60 does not detect pressure, 111
The signals of the j-post adjustment switch 42 and the up/down adjustment switch 44 are cut off, and only the manual switch 34 can be operated. In other words, when there is no seat base for the rear seat 50, the front and rear adjustment switch 4 of the 1 adjustment switch means
2. If the signal is output from the vertical adjustment switch 44 to the central processing unit Y120, the headrest 26 is not adjusted;
Only the headrest can be retracted and returned to the supporting position. Here, the seating detection means I6 is not limited to the head seat switch 60 made of a pressure sensor, but may be configured using, for example, a capacitance type sensor or the like.

Similarly to the seating detection means 16, the obstacle detection means 18 can be, for example, a pressure-sensitive switch 64 such as a pressure sensor. is arranged on the front of the headrest 26 of
It is connected to a central processing unit 20 (see FIG. 2).

When the pressure-sensitive switch 64 detects pressure, a signal is output to the central processing unit 20, thereby detecting the presence of an obstacle such as luggage or a seated person in the direction in which the headrest 26 is retracted. Here, in this invention, the obstacle detection means III is configured to cut off the signal from the storage switch means 12 when the pressure sensitive switch 64 detects an obstacle. That is, even when the seating switch 60 does not detect pressure, if the pressure sensitive switch 64 detects an obstacle, the signal from the retraction switch means I2 is cut off, and the headrest 26 does not retract. In addition, the seated person,
Even though there is luggage, the seat switch 60. When the pressure-sensitive switch 64 detects neither a seated person nor luggage,
Even if the headrest 26 starts rotating in the storage direction by mistake, the headrest will come into contact with the occupant's head or luggage, etc.
Obstacles are detected using pressure-sensitive switches. Then, a signal from the pressure-sensitive switch 64 is output to the central processing unit 20, and the retracting operation of the headrest 26 is immediately stopped, ensuring the safety of the seated person and preventing the motor from overheating due to overload.

Here, the obstacle detection means 18 is not limited to the pressure-sensitive switch 64 such as a pressure sensor, but may be configured using, for example, a photo sensor or the like.

The headrest drive mechanism 68 for rotating and raising and lowering the headrest 26 is roughly configured as follows.

As can be seen from FIGS. 3 and 6, the headrest 26 is connected to a seat back 72 via a pair of stays 70. The stay 70 is formed of, for example, a pipe, and its lower end is inserted into a pair of stay holders 76 fixed to the shaft 74. For example, the stay 70 is inserted into a pair of stay holders 76 fixed to the shaft 74.
The stay is fixed to the stay holder by fitting. The shaft 74 is rotatably installed between a pair of brackets 80 fixed to the seat back 72.
For example, the left end portion is connected to the output shaft of a rotation motor 22 that rotates the headrest 26 . Rotation motor 22
is fixed to the seat back 72 via a motor bracket 82, for example. Further, a slit 64 through which the stay 70 is inserted and which allows the stay to move in the front-rear direction is provided at the upper end of the skin of the seat back 72 over the range of movement of the stay.

In such a configuration, by driving the rotation motor 22,
The shaft 74 is rotated, and the headrest 26 is rotated together with the shaft. For example, as shown in Figure 3,
At the support position of the headrest 26, when the central processing unit 20 outputs a signal to the three rotation motor control relays 3δ and switches the relay contacts 311a and 39a, the rotation motor 22 is rotated in the reverse direction along with the shaft 74. driven in the direction. Then, due to the rotation of the shaft 74,
The headrest 26 is tilted forward and rotated below the driver's rear visibility line 2δ, as shown in FIG.
Stored.

Further, in the retracted position shown in FIG. 4, when a signal is output from the central processing unit 20 to the rotary motor control relays 38 and 39 and the relay contacts 31a and 39a are switched,
The headrest 26 is rotated clockwise and returned to the supporting position as shown in FIG.

Here, as shown in FIG. 6, the potentiometer 41 of the headrest position detection means 40 that defines the rotation range of the headrest 26 is located at a position where the rotation angle of the rotation motor 22 can be measured, for example, on the shaft 74. is fixed to the bracket 80 at the end thereof. In such a configuration, the potentiometer 4I detects the position of the headrest 26,
When the headrest attempts to exceed the support position, storage position, or longitudinal adjustment range, the drive of the rotation motor 22 is immediately stopped via the central processing unit 20, thereby preventing excessive rotation of the headrest.

Note that the headrest position detection means 40 is not limited to the potentiometer 41, but may be constructed from other means, since it is sufficient to define the rotation range of the headrest 26 and prevent excessive rotation of the headrest. .

Further, as shown in FIG. 6, a lifting motor 24 is built into the headrest z6. The elevating motor 24 is, for example, a pace bracket 8 fixed to the upper end of the stay 70.
8 via a motor bracket 9G.

The base bracket 88 is formed, for example, in a substantially U-shape, and one ends of a pair of parallel links 92, 94 are pivotally connected to both sides by, for example, pivot pins 96. The pivot pin 96 is attached with an E-ring or the like. For example, the parallel links 92 are each formed with a sector gear 100 at one end that meshes with a pinion gear 98 of the output shaft of the lifting motor 24.

Further, the other end of the parallel link 92.94 is connected to the connecting pipe 10.
The connecting bin 104 is movably fixed and connected to both ends of the
is rotatably attached to the front bracket 106. As can be seen from FIG. 6, the connecting bin 104 has a head 104a, is inserted into the connecting pipe 102 from one side of the front bracket 1o6 through an insertion hole 10710δ, and extends outward from the other side. For example, the E1J ring 110 is fitted into the extended portion through a washer +09, and is supported irremovably.

Then, attach the front half 1 of the cover that forms the main body of the headrest 26 to the mounting piece 112 of the front bracket.
14. The headrest is constructed by fixing the rear half l 1.6 with screws or the like, and covering the headrest main body with the padding 8 and the skin 120 (see Fig. 3). Here, a notch 117 is provided in the lower part of the rear half 116 to prevent the headrest 26 from coming into contact with the stay 70 when the headrest 26 is raised or lowered. Further, the electric wiring of the lifting motor 24 is protected by a protective member such as a harness, and is inserted into the stay 70 and wired.

In such a configuration, when the lift motor 24 is driven, the parallel links 92 and 94 are swung about the rotation bin 96 via the pinion gear 98, and as the parallel links swung, the front Bracket 106, that is,
The headrest 26 is raised and lowered. For example, in the initial support position of the headrest 2G as shown in FIG.
Lifting motor control relay 51 from central processing unit 20.
A reversal signal is output to relay contacts 51a and 52a.
When this is switched, the lifting motor 24 is driven in the reverse direction. Then, as the lifting motor 24 is driven, the pinion gear 96 rotates counterclockwise, and the sector gear 10
0 and the parallel links 92 and 94 are swung clockwise, as shown in FIG. 5, the headrest 26 is raised.

Furthermore, for example, a headrest 2 as shown in FIG.
When the central processing unit 20 outputs a normal rotation signal to the lifting motor control relays 51 and 52 at the support upper limit position 6, and the relay contacts 51a and 52a are switched, the lifting motor 24 is driven in the normal rotation direction.

Then, as the lift motor 24 is driven, the pinion gear 98 rotates clockwise, swings the parallel links 92.94 counterclockwise via the sector gear 10G, and the headrest 2G is lowered.

Here, an elevation limit switch 53 is provided that limits the range of elevation of the headrest 26 (see FIG. 6). The lift limit switch 53 is fixed to the base bracket 88 at the upper and lower limit positions of the headrest 26 such that, for example, the upper and lower mounting pieces 112 of the front bracket 106 can press the limit switch. However, the present invention is not limited to this, and the elevation limit switch 53 may be configured to be pressed by another member. The lift limit switch 53 is connected to the central processing unit 20, and when it is turned on by being pressed by the mounting piece 112 of the front bracket, a stop signal for the lift motor 24 is sent from the central processing unit to the lift motor control relays 51 and 52. Output. Then, the elevating motor 24 is immediately stopped, and excessive elevating and lowering of the headrest 26 is prevented.

In the embodiment, the range of elevation of the headrest 26 is defined by the elevation limit switch 53. However, the present invention is not limited to this, and for example, when the headrest 26 is at the upper limit support position or the initial support position, the overcurrent shown in FIG. It may be configured to detect with the detection resistor 59 and stop the elevating motor.

Note that in the headrest control device 10 configured as described above,
For example, the central processing unit 20 may be controlled by a control button.

The control box may be located within the seat back 72 of the seat, for example (see FIG. 1).

The headrest control system by the headrest control device 10 having the above configuration will be explained in detail along the flowchart of FIG.

First, the main switch of the headrest control device 10 is turned on. Normally, the ignition switch 56 also serves as the main switch, and when the driver sits down and turns on the ignition switch, the main switch is also automatically turned on (130). Then, it is determined whether the seating switch 60 of the seating detection means is on (+31).

Here, for example, assuming that there is a person sitting on the rear seat 50, the seating switch 60 of the seating detection means
It turns on by detecting the pressure of the seated person.

Then, since the seating switch 60 is on, (131
) is determined to be YES. Then, it is determined whether the upward direction of the vertical adjustment switch 44 of the adjustment switch means 14 is on (132) and whether the downward direction is on (133). At this time, if one is turned on, the other is turned off. And then, next, the front and back adjustment switch...4217)
It is determined whether the 1'+ii direction is on (134) and whether the backward direction is on (135>).

For example, in order to adjust the vertical position of the headrest 26, assuming that the ``-down adjustment switch 44 is turned on upward and the front/rear 1 adjustment switch 42 is not operated, (13
2) is determined as YES, and it is determined whether or not the lifting limit switch 53 is on in the reverse direction of the lifting motor 24 (136). And in (13B>,
The lift motor 24 is in the drivable OFF state, that is, NO.
If it is determined, the lifting motor is driven in the reverse direction (
137). Here, since the n11 post-adjustment switch 42 has not been operated, NO is determined in both (134) and (135). In addition, since the synchronized motor 22 is not driven and the holding mechanism is not operating,
In both (138) and (139), the determination is NO.

Then, when the lift motor 24 is driven in the reverse direction, the headrest 26 is raised to the upper limit position, and the lift limit switch 53 is turned on, YES is determined in (136). Then, it is determined whether or not the lifting motor 24 is driving (140), and since the lifting motor is driving, it is determined YES, and the lifting motor is stopped (140).
IN). Furthermore, if the seated person turns off the vertical adjustment switch 44 at any position before the vertical limit switch 53 is turned on, YES is determined at (+32) and N01 (140), and the vertical motor 24 stops. (141), so the headrest 2G can be set at any position.

Also, when the second lower adjustment switch 44 is turned on downward,
(133) is determined to be YES. Then, when the lift limit switch 53 is turned off and the determination is NO (142), the lift motor 24 is driven in the forward rotation direction until the lift limit switch is turned on and the determination is YES (143). . The headrest 26 is lowered to the maximum position, the vertical limit switch 51 is turned on, and (
If YES is determined in step 142), driving of the lifting motor 24 is determined in step 140, and if YES is determined, driving of the lifting motor 24 is stopped (141.).
. Also, before the lift/lower switch 51 is turned on,
If the seated person turns off the vertical adjustment switch 44 at any position, Y at N05 (I40) at (133).
They are judged as F and S, respectively. Then, the lifting motor 2
4 is stopped (141>, so heno dress) 26 can be set at any position.

Further, for example, suppose that in order to adjust the longitudinal position of the headrest 26, the longitudinal adjustment switch 42 is turned on in the 111j direction and the vertical adjustment switch 44 is not operated.
(132), (133), and (14f)) are each determined to be NO. Then, YES is determined in (134), and the headrest position detection means 40
．． It is determined whether the measured value α of the button rotation meter 41 is smaller than the set value O1 in the reverse direction of the rotary motor Z2 (144). Normally, within one training range of the front and back of the headrest 26, the measured value α of the button meter 4] is equal to the set value θl of the rotation motor z2 in the reverse direction.
Since it is larger, it is determined NO in (144). Then, the rotary motor 22 is driven in the reverse direction until the measured value α of the button meter 41 becomes smaller than the set value θ1 and YES is determined (145).

Then, the rotation motor Z2 is driven in the reverse direction, the headrest 26 is rotated to the front limit position of the front-back adjustment, and the measured value α of the potentiometer 41 of the headrest position detection means is set to the reverse direction of the rotation motor 22. If it becomes smaller than the set value θ1 in the direction, YES is determined in (144). Then, in (13g), it is determined whether or not the rotary motor 22 is driving, and if it is determined YES, the rotary motor is stopped (146). Furthermore, if the seated person turns off the n+1 post-adjustment switch 42 at an arbitrary position before the measured value α of the potentiometer 41 becomes smaller than the set value θl, the result will be No in (134) and YES in (13g>). As a result, the rotation motor 22 is stopped (14B>), so the headrest 2S can be set at any position.

Also, when the front and rear adjustment switch 42 is turned on backward, (
134) and N01 (J, 35) are determined to be YES. And potentiometer 41
It is determined whether the measured value α is larger than the set value θ2 in the normal rotation direction of the rotary motor 22 (147).

Normally, within the longitudinal adjustment range of the headrest 26, the measured value α of the potentiometer 41 is smaller than the set value θ2 in the normal rotation direction of the rotary motor 22;
7) is determined to be NO. If it is determined No in (147), the rotary motor 22 is driven in the normal rotation direction until the measured value α of the button meter 4I becomes larger than the set value θ2 and it is determined as YES ( I
L8).

When the dress 26 rotates to the initial support position, the measured value α of the potentiometer 4I becomes larger than the set value θ2, and YES is determined at (14?), (13
In 8), the drive of the rotary motor 22 is determined, and YF,
S is determined, and the rotation motor is stopped (146).

Also, the measured value α of the potentiometer 41 is the set value θ2
If the seated person turns off the longitudinal adjustment switch 42 at an arbitrary position before it becomes larger, N01 at (135)
Since the determination in (138) is YES and the rotation motor 22 is stopped (146), the headrest 26 can be set at any position.

In addition, if there is no person sitting on the rear panel 50 and the seating switch 60 does not detect pressure, the seating switch is turned off and NO is determined in (131), so the front/rear adjustment switch 42 and the vertical adjustment switch 44 The control signal will be cut off, making vertical adjustment and front/rear adjustment impossible. Then, whether the pressure-sensitive switch 64 of the obstacle detection means is on or not (
149) is determined.

For example, assuming that the headrest 26 is in the supporting position and there is no obstacle in the retracting direction of the headrest 26, it is determined No in (149), and it is determined whether the manual switch 34 of the retracting switch means is on or not (150).
is judged. If YES is determined in (150), the measured value α of the potentiometer becomes 1111.
It is determined whether or not it is within the post-adjustment range (151). When the headrest 26 is in the support position, YES is determined after (+51) l, and the holding mechanism is turned on in the retraction direction (152). Then, it is determined whether the measured value α of the potentiometer 41 is smaller than the set value θ3 at the storage position (
153), and when the determination is NO, the rotary motor 22 is driven in the reverse direction until the measured value α becomes larger than the set value θ3 (154).

When the headless (26) is rotated to the storage position and the measured value α of the button meter becomes smaller than the set value 03 at the storage position, and it is judged as YES at (153), it is judged as YES at (13+1). and the drive of the rotation motor 22 is stopped (146).Then, (1
52>, the holding mechanism is turned on, so (1
39) is determined as YES, the holding mechanism is turned off (15G), and the headrest 26 is retracted.

Here, when the headrest 26 is retracted, before the measured value of the potentiometer 41 becomes smaller than the set value 03 at the retracted position, the headrest comes into contact with an obstacle such as luggage, and the pressure-sensitive switch of the obstacle detection means is activated. When 64 detects the pressure, it is determined as YES at (1, 49''). Then, it is determined as YES at (13g), and the drive of the rotary motor is stopped (146).

When the manual switch 34 is turned on to return the headrest 26 to its retracted position, (+50
) and NO in (151), respectively, and the holding mechanism is turned on in the return direction (1
57). Then, in (147), it is determined whether the measured value α of the potentiometer 41 is larger than the set value 02 in the normal rotation direction, and if it is determined NO, the measured value α is larger than the set value θ2. The rotary motor 22 is driven in the normal rotation direction until it is determined as YES (i4g). When the headrest 26 is rotated to the support position and the measured value α of the potentiometer 41 becomes larger than the set value θ2 in the normal rotation direction, and it is determined YES in (147), (1
311), the rotation motor 22
The drive of is stopped (1.46). And (157)
Since the holding mechanism is turned on at (139)
is judged as YES, and the holding mechanism is turned off (1
5B), the headrest 26 returns to the supporting position.

Here, if the manual switch 34 is turned on and the rotation motor 22 is driven, and then the manual switch is turned off, the determination in (150) is NO.

However, since the holding mechanism is activated, (155), (
158), the rotation motor 22
is driven continuously.

Furthermore, in the supported position of the headrest 26, if the seated person has a bad sitting posture, the seat switch 60 will turn off without detecting pressure even though the seated person is seated, and it will be determined NO in (131). Monkey. However, if the seated person's head presses the front surface of the headrest 26 and the pressure-sensitive switch 64 is turned on, then Y at (149)
Since it is determined to be ES, the retracting operation of the headrest 2G does not occur.

As described above, according to the headrest control system of the present invention, the seating detection means 1 provided on the seat cushion 62
6 detects the presence or absence of a seated person, and the obstacle detection means 18 built into the headrest 26 detects the presence or absence of an obstacle on the seat, and the headrest can be retracted only when there is neither a seated person nor an obstacle. It is composed of Therefore, even if the driver accidentally operates the manual switch 34 when a person is seated in the rear seat 50 or the front passenger seat, the headrest 26 will not be retracted, causing the occupant to feel uneasy. There is no.

For example, if neither the seat switch 60 of the seat detection means nor the pressure-sensitive switch B4 of the obstacle detection means detects pressure due to light weight or poor sitting posture, regardless of the presence or absence of a seated person, By operating the storage switch means 12, the storage operation of the headrest 26 is started. However, even if the headrest 26 accidentally starts rotating when a person is seated, if the headrest comes into contact with the head of the person seated and the pressure-sensitive switch 64 of the obstacle detection means detects the pressure. Since the rotational movement of the headrest is immediately stopped, the safety of the occupant can be sufficiently ensured.

Even when the load is higher than the storage position of the headrest 26, the headrest comes into contact with the load and the pressure-sensitive switch 6
4 detects pressure, the rotational movement of the headrest is immediately stopped, so the rotational motor 22 will not generate heat due to overload.

In the embodiment, the headrest 26 is attached to a rear seat, but a seat rest attached to a passenger seat can also be constructed in the same manner as the rear seat.

In this case, the headrest adjustment switch means 14 is provided on the armrest of the front door on the side of the passenger seat, the storage switch means 12 is provided at a position that can be operated by the driver and the person seated in the rear seat, and the headrest 26 is provided in the third position. It is configured to be stored below the front visibility line 29 shown in FIGS.

Further, in the embodiment, a four-door type passenger car having a rear door is embodied, but the headrest 24 of the present invention is attached to a rear seat of a two-door type passenger car, for example, and the headrest control is performed. It may also be configured to be controlled by the device ZlO. Also,
Although it is suitable for passenger cars, it is not limited thereto, and may be attached to bread, etc., for example.

The above-mentioned embodiments are for illustrating the present invention, and are not intended to limit the scope of the present invention, and all modifications and modifications within the technical scope of the present invention are also included in the present invention. Needless to say.

〔Effect of the invention〕

As described above, according to the headrest control system according to the present invention, the presence or absence of a seated person is detected by the occupancy detection means provided in the seat cushion, and the presence or absence of a seated person is detected by the obstacle detection means built in the headrest. The headrest is configured so that it can be retracted only when there is no occupant or obstacle present. Therefore, even if the driver accidentally operates the storage switch means when a person is seated in the rear seat or in the passenger seat, the headrest will not be retracted.
It does not give a feeling of anxiety to the seated person.

In addition, if neither the seating detection means nor the obstacle detection means detect pressure, for example because the person's weight is light or the sitting posture is bad, the headrest can be adjusted by operating the retractable switch means regardless of whether or not there is a person sitting on the seat. A storage operation is started. However, even if the rotation of the headrest is accidentally started when a person is seated, if the headrest comes into contact with the occupant's head and the obstacle detection means detects pressure, the headrest will not be able to rotate. Since the operation is stopped immediately, the safety of the seated person can be ensured within 1 minute.

Furthermore, even if the load is higher than the storage position of the headrest, if the headrest comes into contact with the load and the obstacle detection means detects pressure, the rotational movement of the headrest will be stopped immediately, so the rotation motor will not generate heat due to overload. There's nothing to do.

According to the headrest control device of the present invention, the above-mentioned headrest control system can be carried out appropriately, and not only the headrest can be retracted and restored, but also the front and rear positions and up and down positions of the headrest can be easily adjusted, thereby improving safety. , comfort is improved to 1 min.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a headrest control device according to the present invention, FIG. 2 is a detailed block diagram centered on the central processing unit, and FIGS. 3, 4, and 5 are diagrams showing headrest support. position,
6 is a partially broken perspective view of the headrest drive mechanism, and FIG. 7 is a headrest according to the present invention! - Control/stem flowchart. 10: headless)・control device, 12: storage switch means, 14: adjustment switch means, I6: w dust detection means, 1
8=Obstacle detection means, 20: Central processing unit (・, 22
: Rotation motor, 24: Lifting motor, 26: Headrest, 28: Rear view '8m, 34: Manual switch,
36: Microcomputer (microcomputer), 3g. 39
H rotation motor control relay, 40; helad rest position detection means, 42: ii + post-adjustment switch, 44: vertical 10% adjustment switch, H, 51.52: lifting motor control relay, 5
3: Limit switch, 60 two-seat switch, B4: Pressure sensitive switch, 68: Headrest drive mechanism. Figure 1

Claims (3)

[Claims] (1) In a headrest control system in which the headrest rotates between a retracted position that ensures the occupant's view of other seats and a support position that supports the occupant's head, The detection means detects the presence or absence of a seated person, and the obstacle detection means built into the headrest detects the presence or absence of an obstacle on the seat.When there is no obstacle, a signal is output in the direction of retracting the headrest. , the headrest rotates to a retracted position below the line of sight of those seated in other seats to ensure forward or rearward visibility, and an obstacle is detected when the headrest is rotated in the retracted direction. When the headrest control system immediately stops retracting the headrest. (2) A headrest that is movable up and down at the upper end of the seat back and can be rotated between a support position that supports the head of the seated person and a storage position below the rear visibility or front visibility; A rotation motor for rotating the headrest, a lifting motor for raising and lowering the headrest, and a storage switch means provided at a position operable by the driver to control the drive of the rotation motor and retract and return the headrest. and adjustment switch means, which are provided at positions operable by a person sitting in the rear seat or the front passenger seat, and which control the drive of the rotation motor and the lift motor to adjust the longitudinal and vertical positions of the headrest. and processes the input information according to a predetermined program,
A central processing unit that controls the drive of the rotation motor and the lift motor, a seating detection means that is installed in the seat cushion of the rear seat or passenger seat and detects whether there is a person sitting on the seat, and a seat detection means that is built into the headrest and is installed on the seat cushion. an obstacle detection means for detecting the presence or absence of an obstacle; and, by operating the storage switch means and the adjustment switch means,
It drives the rotation motor and lift motor to allow the headrest to be retracted, returned to its original position, or adjusted back and forth and up and down, and only when neither a seated person nor an obstacle is detected by the seating detection means or obstacle detection means. , a headrest control device configured such that the headrest can be retracted. (3) The headrest control device according to claim 2, wherein the obstacle detection means is a pressure-sensitive switch provided on the front surface of the headrest.