JP2665983B2 - Headrest control method and headrest control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a headrest control method and a headrest control device for controlling movement of a headrest between a storage position and a support position.

[Conventional technology]

For example, as typified by an automobile seat, a headrest that supports the head of a seated occupant is disposed at an upper end of a seat back of various automobile seats.

For example, as the headrest of the assistant seat, the motor drives the headrest between the storage position below the driver's side line of sight and the front line of sight of the rear seat occupant, and the support position supporting the occupant's head. A rocking configuration is known.

In such a configuration, the motor is driven and controlled, for example, by operating a one-touch type auto switch, whereby the headrest of the assistant seat can be stored below the line of sight. Therefore, the side view of the driver and the front view of the occupant of the rear seat during normal running can be ensured without being obstructed by the assistant seat, and safety and comfort can be improved.

Here, for example, when the headrest swings,
When the swing of the headrest is mechanically prevented by a luggage placed on the seat back, a foreign object sandwiched between a movable member such as a stay, and a fixed member such as the seat back, the motor is stopped. Is overloaded, and an overcurrent flows through the motor. Such an overcurrent may overheat and damage the motor. Therefore, the overload state of the motor is detected, and when the motor is in the overload state, the motor is immediately stopped,
A configuration for stopping the swing of the headrest is well known. According to such a configuration, the motor is immediately stopped in the overload state of the motor, so that overheating and damage of the motor due to the overcurrent can be prevented, and safety for the motor is ensured.

[Problems to be solved by the invention]

However, in a known configuration, for example, mechanical blocking (mechanical lock) by pinching a load, a foreign object, or the like.
However, when the motor is overloaded, the headrest is stopped by the overload of the motor while the luggage, foreign matter, etc., which caused the mechanical lock, are still trapped. For this reason, when the headrest at the time of storage trapped luggage, foreign matter, etc., the headrest was once returned to the support position by operating an auto switch and the clamping was released, which caused a mechanical lock. Luggage and the like must be removed, which complicates operation.

In particular, when the occupant of the rear seat retracts the headrest of the assistant seat, the view of the assistant seat on the seat cushion is obstructed by the seat back, so that it is possible to check the luggage and the like placed on the seat cushion and to pinch. It is not easy to remove the luggage and the like after being loaded.

By the way, the auto switch is configured as a one-touch type that memorizes an operation direction, and usually, by one operation,
The headrest can swing to the storage position or the support position. However, in such a configuration, if the auto switch is operated erroneously, the motor is driven until the headrest reaches the storage position and the support position, or until the headrest enters the mechanical lock state by holding luggage, foreign matter, etc. Is done. The headrest is abruptly swung due to an erroneous operation of the auto switch. Therefore, if there is a seated person, the headrest may be injured. Therefore, the safety of the occupant,
A decline in comfort is inevitable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a headrest control method and a headrest control device for improving safety for a motor and safety and comfort for a seated person.

[Means for solving the problem]

To achieve this object, according to the present invention, an overload state of the motor is detected, and when the overload state of the motor is detected when the headrest is stored, the motor is immediately driven in the reverse direction to support the headrest. Automatic return to the position. When the overload state of the motor is detected when the headrest returns to the support position, the motor is immediately stopped, and the headrest is stopped at that position.

Here, it is preferable that the headrest can be stored by driving the motor only when the auto switch for controlling the drive of the motor is continuously operated in the storage direction for a predetermined time or more.

〔Example〕

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

As shown in FIGS. 1 and 2, a headrest control device 10 according to the present invention comprises a motor 12, an auto switch 14
, A central processing unit 16, a discriminating circuit 18, and an overload detecting means 20. The swing of the headrest 22 can be controlled by driving a motor. A DC geared motor can be used as the motor 12, and when the motor is driven, the headrest 22 swings between the support position and the storage position.

The headrest 22 is, for example, an assistant seat 24
At the supporting position, the head of the occupant of the assistant seat is supported, and the head is prevented from moving backward in a collision or the like. Further, as shown by a dashed line in FIG. 1, the headrest 22 connects a line of sight of the occupant of the rear seat 26 to a hood (not shown) or the like at the storage position. By swinging below the so-called front view line 28 and the headrest swinging to the stowed position, the front view of the occupant of the rear seat and the side view of the driver are ensured.

The drive of the motor 12 is controlled, for example, by operating the auto switch 14. As the auto switch 14, for example, as shown in FIG.
An automatic reset type seesaw switch having a neutral position and a 2-position contact point capable of switching 12 rotation directions is available. And the auto switch 14
As shown in FIG. 3, it is provided at a position where both the driver and the rear seat occupant can operate, for example, near the driver of the seat back 30 of the assistant seat, that is, at the inner side 32. The auto switch 14 is connected to the central processing unit 16 as shown in FIG. 2, and a predetermined signal corresponding to the operation direction is output to the central processing unit by operating the auto switch.

The central processing unit 16 is formed with a microcomputer (microcomputer) 34, which is configured to process an input according to a stored program and generate an appropriate control signal. The control signal is output to, for example, relays 36 and 38 connected to the central processing unit 16 as shown in FIGS. 1 and 2, and the relays move the corresponding relay contacts 36a and 38a in an appropriate direction. By switching, the driving of the motor 12 is controlled.

Here, the auto switch 14 is of a one-touch type. For example, when the auto switch 14 is turned on in an arbitrary direction, a memory function is activated to store a switch operation. Then, while the motor 12 is being driven, the auto switch 14
Is turned off, the driving of the motor is continued by the memory function. In such a configuration, it is sufficient to turn on the auto switch 14 once, so that the headrest 22 can be easily stored and returned by the switch operation.

By the way, for example, when the headrest 22 is swung by the auto switch 14, the drive of the motor 12 is continued until the headrest reaches the storage position or the support position and operates the respective limit switches (not shown). Is done. Therefore, in particular, when the headrest 22 is stowed due to erroneous operation when the headrest 22 is difficult to confirm safety from a occupant of the rear seat,
There is a risk that the assistant seat occupant or the like may be injured unexpectedly.

Therefore, focusing on the fact that the erroneous operation of the switch is instantaneous, the timer 40 is interposed between the contact in the storage direction of the auto switch 14 and the central processing unit 16. Then, the operation signal of the auto switch 14 in the storage direction can be output only when a switch operation is performed continuously for a predetermined time set in the timer 40 in advance.
The set time of the timer 40 is, for example, about 0.5 seconds. In such a configuration, even if the auto switch 14 is erroneously turned on in the storage direction, the motor 12 is not driven and the headrest 22 is not stored in an instantaneous operation.
Therefore, the safety of the occupant of the assistant seat against the erroneous operation of the auto switch 14 is ensured.

The auto switch 14 is also connected to the discriminating circuit 18 as can be seen from FIGS. The determination circuit 18 is connected to the central processing unit 16, and is configured to determine, for example, the operation direction of the auto switch 14 and output a corresponding signal to the central processing unit.

Further, the headrest control device 10 includes an overload detecting means 20 for detecting an overload of the motor 12. The overload detection means 20 includes, for example, an overcurrent detection resistor 42 connected in series to the motor 12, and a terminal of the overcurrent detection resistor is connected to the determination circuit 18. And a discrimination circuit
The set value preset in 18 and the voltage of the terminal of the overcurrent detection resistor 42 are constantly compared.

For example, the swing of the headrest 22 may be caused by the luggage placed on the seat cushion 44, the headrest stay 46,
If the motor 12 is mechanically blocked (mechanically locked) by a foreign object or the like sandwiched between the upper ends of the seat back 30, the motor 12 is overloaded. Then, the torque of the motor 12 increases, the current value increases due to the TI characteristic (torque-current characteristic) of the motor, and the voltage value of the terminal of the overcurrent detection resistor 42 increases. Then, when the voltage value of the terminal of the overcurrent detection resistor 42 becomes larger than the set value of the determination circuit 18, a predetermined signal (warning signal) is output from the determination circuit to the central processing unit 16,
The relays 36 and 38 are energized by the signal from the central processing unit, and the relay contacts 36a and 38a are switched, so that the motor 12
Is stopped immediately. In other words, the swing of the headrest 22 is prevented by obstacles such as luggage and foreign matter, and the motor 12
When the motor 12 is over-locked and the motor 12 is overloaded and an overcurrent occurs in the motor, the motor is immediately stopped, so that overheating, breakage, etc. of the motor can be reliably prevented, and safety for the motor is ensured.

Here, in the headrest control device 10 of the present invention, for example, when the motor 12 is stopped due to an overload or the like when the headrest 22 is stored, the headrest is automatically returned to the supporting position at the same time as the motor is stopped (auto return). It is configured to be possible. That is, when the headrest 22 is retracted, the swing of the headrest is prevented by luggage, foreign matter, and the like, and even if the motor 12 is stopped due to an overload state, the headrest does not stop while holding the luggage, etc. It stops in the state where it returned to the support position. for that reason,
Luggage, foreign matter, etc. that caused the mecha lock can be easily removed.

In addition, the headrest control device 10 of the present invention further includes, for example, a seat detection unit 48 and a door detection unit 50 as other safety ensuring functions.

As the seating detecting means 48, for example, a pressure-sensitive seating sensor can be used. The seating sensor is disposed in the seat cushion 44 of the assistant seat, and as shown in FIGS. 1 and 2, the central processing unit 16, Each is connected to the discriminating circuit 18. Then, a seating sensor (seating detecting means) 48
When the pressure is detected, the central processing unit 16
A signal is output to 18 so that a signal from the auto switch 14 to the central processing unit can be cut off by detecting a presence of an assistant seat occupant by a determination circuit.

For example, when the discriminating circuit 18 detects the presence of a seated person based on a signal from the seating sensor 48, a seating detection signal (warning signal) is output from the discriminating circuit to the central processing unit 16, and the signal from the auto switch 14 is cut off. Is done. Therefore, when there is a seated person in the assistant seat, the operation of the auto switch 14 does not cause the storage of the headrest 22 and the malfunction of the headrest can be sufficiently prevented. Also,
When the headrest 22 is stored, when the determination circuit 18 detects the presence of a seated person by a signal from the seating sensor 48,
The headrest is automatically returned to the support position immediately. Therefore, the safety of the occupant can be sufficiently ensured.

The door detecting means 50 is provided so as to detect the opening of the corresponding door, and is connected to the central processing unit 16 and the discriminating circuit 18 as shown in FIGS.
The door detecting means 50 operates so as to be turned on at the same time when the corresponding door, for example, the front door 52 on the assistant seat side is opened. For example, a door switch for a room lamp which is turned on when the door is opened can be used. When the door detection means (door switch) 50 detects the opening of the corresponding door when the headrest 22 is in the storage position, the motor 12 is driven and the headrest can be automatically returned to the support position.

In such a configuration, when the headrest 22 is in the storage position, when the occupant attempts to sit on the assistant seat 24 and opens the corresponding front door 52, the headrest automatically returns to the support position simultaneously with the opening of the door. , Seated passengers are not disturbed. Then, even if the headrest 22 is retracted before sitting, the headrest is always returned to the supporting position when sitting, so after sitting, the auto switch 14 is operated to return the headrest from the storing position to the supporting position. You don't have to. Therefore, when the assistant seat occupant gets on the vehicle, it is possible to sufficiently secure good riding performance without complicated operations.

As can be seen from FIGS. 1 and 2, the motor
12, together with the central processing unit 16, is connected to, for example, a battery 54 of an automobile, and is driven by a supply voltage from the battery.

In the headrest control device 10 having the above configuration,
The central processing unit 16, the discriminating circuit 18, and the like may be housed in, for example, the control box 56, and the control box may be built in, for example, the seat back 30 of the assistant seat (see FIGS. 1 and 3).

A headrest control method by the headrest control device 10 having the above configuration will be described in detail with reference to the flowchart of FIG.

First, the main switch of the headrest control device 10 is turned on. Normally, an ignition switch (not shown) also serves as a main switch. For example, when a driver sits down and turns on an ignition switch, the operation of the headrest control device 10 starts.

When the operation of the headrest control device 10 starts, first, whether or not the seat sensor 48 is on (60), the door switch 50
Are sequentially turned on (62). For example, if it is assumed that there is no occupant in the assistant seat 24 and the front door 52 on the assistant seat side is closed, NO is determined in each of (60) and (62). Next, it is determined whether the auto switch 14 is on in the return direction (64) and whether it is on in the storage direction (66). For example, assuming that the auto switch 14 is not operated, first, (64) is determined as NO.
Here, if (NO) is determined in (64), it is next determined whether or not the motor current If in the storage direction is larger than the overcurrent Imax (68). It is determined whether 14 is ON in the storage direction.
Normally, since the motor current If is smaller than the overcurrent Imax,
In (68), it is determined as NO, and since the auto switch 14 has not been operated, it is determined as NO in (66).

In this state, for example, when the auto switch 14 is turned on in the storage direction, YES is determined in (66), the timer 40 is reset, and the measurement for 0.5 seconds is started (70). The measurement time T is
It is determined whether 0.5 seconds have elapsed (72). The auto switch 14 is continuously operated in the retracted direction for 0.5 seconds or more, and until the measured time T of the timer 40 elapses 0.5 seconds, (NO) is determined in (72) and the timer elapses 0.5 seconds, and YES
Is determined, the motor 12 is driven in the storage direction, and the headrest 22 swings in the storage direction (74).

At this time, before the measurement time T of the timer 40 elapses 0.5 seconds, that is, before it is determined to be YES in (72),
When the operation of the auto switch 14 in the storage direction is released and turned off, the determination at (66) is NO. for that reason,
Drive of the motor 12 in the storage direction, that is, the headrest 22
Does not occur, and safety against erroneous operation of the auto switch 14 is ensured.

Then, in (74), when the motor 12 is driven in the storage direction, next, the limit switch is turned on in the storage direction (76), and a warning signal is output from the determination circuit 18 (78). ) Are determined. For example,
If the current If of the motor 12 is a normal value, in (76),
If NO is determined, the motor is continuously driven until the limit switch is turned ON and YES is determined, and the headrest 22 is swung to the storage position. When the headrest 22 reaches the storage position and the limit switch is turned on in the storage direction, YES is determined in (76), the driving of the motor 12 in the storage direction is immediately stopped, and the headrest 22 is stored. (80).

Here, for example, when the headrest 22 is stored, that is, when the motor 12 is driven in the storage direction, an overcurrent flows through the motor due to a mechanical lock or the like, and the motor current If becomes overcurrent.
If it becomes larger than Imax, it is determined as YES in (68), the discrimination circuit 18 detects the occurrence of the abnormality, and a warning signal is generated from the discrimination circuit (82). Then, first, at (78), YES is determined, the drive of the motor 12 in the storage direction is stopped (80), the motor is driven in the return direction (84), and the headrest 22 is moved in the return direction (support direction). Rocked.

Then, it is determined whether the motor current Ir in the return direction is larger than the overcurrent Imax (86) and whether the limit switch is ON in the return direction (88). For example, in the normal state of the motor 12, since the motor current Ir is smaller than the overcurrent Imax, it is determined as NO in (86), the headrest 22 reaches the support position, and the limit switch in the return direction is turned on. In (88), YE
Until determined to be S, driving of the motor in the return direction is continued. Then, for example, the headrest 22 returns to the support position, the limit switch is turned on, and (88)
If the answer is YES, the motor 12
Is stopped (90), and the headrest 22 is automatically returned to the support position. Thereafter, the warning signal from the determination circuit 18 is cut off (92).

Here, for example, when the headrest returns,
When driving the motor 12 in the return direction, if the motor current Ir in the return direction becomes larger than the overcurrent Imax due to a mechanical lock or the like, YES is determined in (86), and the drive of the motor in the return direction is immediately performed. Stopped (90).

When the headrest 22 is retracted, the auto switch 14
Is turned on in the return direction, YES is determined in (64), and a warning signal is output from the determination circuit 18 (82),
The motor 12 is driven in the return direction (84). That is, even when the headrest 22 is being stored, if the auto switch 14 is turned on in the return direction, the headrest is automatically returned immediately to the support position. Therefore, even if a malfunction occurs in the headrest 22 due to an erroneous operation of the auto switch 14 or the like, it is sufficient to operate the auto switch in the return direction, and the safety of the occupant against the malfunction of the headrest is ensured.

If it is assumed that the headrest 22 is in the retracted position, the assistant seat 24 has no occupant, and the front door 52 is closed, and the auto switch 14 is turned on in the return direction, (60), (62) NO at (64)
Is determined as YES. Then, the discrimination circuit 1
8 generates a warning signal (82), drives the motor 12 in the return direction (84), and drives the motor in the return direction until one of (86) and (88) is determined to be YES.
22 is returned to the support position.

Further, for example, when there is a seated person in the assistant seat 24 and the seating sensor 48 is turned on,
When 52 is opened and the door switch 50 is turned on, YES is determined in (60) or (62). That is, for example, when the headrest 22 is in the support position, even if the auto switch 14 is operated in the storage direction,
Since the signal from the auto switch is shut off, the headrest 22 is not stored. Therefore, safety for the motor 12 and the assistant seat occupant is ensured.

Here, when the headrest 22 is in the storage position or when the headrest is stored, for example, one of the seating sensor 48 and the door switch 50 is turned on, and (6
If either of (0) and (60) is determined as YES, the determination circuit
A warning signal is generated from 18 (82), the motor 12 is driven in the return direction (84), and the headrest 22 is automatically returned to the support position. That is, for example, when the seating sensor 40 detects the presence of a seated person or luggage when the headrest 22 is stored, the motor 12 is immediately driven in the return direction to automatically return the headrest 22 to the support position. Therefore, the overcurrent of the motor 12 and the pressing of the luggage or the like by the headrest 22 can be prevented.

Further, for example, if the front door 52 is opened when the headrest 22 is stored, YES is determined in (62), and a warning signal is generated from the determination circuit 18 (82), and the motor
12 is driven in the return direction (84), and the headrest is automatically returned to the support position. Therefore, at the time of riding, the headrest 22 is always at the support position, and the headrest does not hinder the occupant's riding, and good riding performance is obtained.

As described above, according to the headrest control method of the present invention, the overload state of the motor 12 is detected and the headrest 22
When the motor is overloaded during storage, the motor is immediately driven in the reverse direction, and the headrest is automatically returned to the supporting position. In other words, even if the headrest 22 sandwiches luggage, foreign matter, etc., it is not stopped while being sandwiched,
It stops in the state where it returned to the support position. Therefore, the mechanical lock, that is, luggage, foreign matter, or the like that caused the overload state of the motor 12 can be easily removed without operating the auto switch 14.

In addition, when the motor 12 is overloaded when the headrest 22 returns, the motor is immediately stopped, and the headrest is stopped at that position. Foreign matter that may cause a mechanical lock when the headrest 22 is returned is usually
Above the headrest stay 46 and the seatback, the headrest can be easily removed without swinging to another position. Therefore, the operation of removing foreign matter and the like is simplified. Further, even if an overload state occurs when the headrest 22 returns, the headrest is not suddenly swung in the storage direction, so that the safety of the occupant can be ensured.

Then, only when the auto switch 14 is continuously operated in the storage direction for a predetermined time or more, the motor 12 is driven,
With the configuration in which the headrest 22 is stored, the headrest is not stored in response to an erroneous operation due to instantaneous contact with the auto switch or the like. Therefore, the safety and comfort of the occupant against erroneous operation of the auto switch 14 in the storage direction are sufficiently ensured.

Further, the presence / absence of a seated person is detected, and the headrest 22 can be stored only when there is no seated person, and when there is a seated person, even if the headrest is erroneously stored, the headrest storage is immediately stopped, and the headrest is stopped. May be automatically returned to the supporting position. According to such a configuration, even if the auto switch 14 is accidentally operated in the retracted direction when there is a seated person, the headrest
Since 22 is not stored, the safety of the occupant against malfunction of the headrest or the like can be sufficiently ensured.

Then, even if the occupant is detected when the headrest 22 is retracted, the headrest is automatically returned to the support position immediately, so that the occupant does not come into contact with the occupant, and in this regard, the safety of the occupant is ensured. .

Further, the opening of the corresponding door 52 is detected, the headrest 22 can be stored only when the door is closed, and when the door is opened, the headrest is automatically moved to the supporting position when the headrest is in the storage position. It may be configured to return. According to such a configuration, the safety of the occupant can be further ensured, and the headrest 22 is automatically returned to the support position by opening the door 52 without operating the auto switch 14. Can be ridden without being hindered by the headrest, and good rideability can be sufficiently obtained.

In the embodiment, the overload detection means 20 has an overcurrent detection resistor 42 connected in series with the motor 12, and is configured to detect an overload state of the motor from the voltage value of the overcurrent detection resistor terminal. I have. However, it is sufficient that the overload state of the motor 12 is detected, and the present invention is not limited to this.

In the embodiment, the seating detecting means 48 is constituted by a pressure-sensitive seating sensor. However, the seat detection means
The detector 48 is not limited to this, because it is sufficient to detect the presence or absence of a seated person, and may be configured by other means, for example, a capacitance sensor or the like.

In the embodiment, by driving the motor 12,
It is embodied as a headrest 22 that can swing back and forth. However, the present invention is not limited to this. For example, the headrest control device 10 of the present invention may be applied to a headrest configured to move between a storage position and a support position by elevating.

In the embodiment, the headrest 22 is mounted on the assistant seat 24. However, the headrest mounted on the rear seat 26 can be configured similarly to the headrest of the assistant seat. In this case, the headrest
The seat detection means 48 is provided on the rear seat 26, and the door detection means 50 is provided on the corresponding rear door, respectively.

The embodiments described above are for explaining the present invention, and do not limit the present invention in any way. All modifications and alterations within the technical scope of the present invention are included in the present invention. Needless to say.

〔The invention's effect〕

As described above, according to the headrest control method according to the present invention, the overload state of the motor is detected, and the motor is immediately driven in the reverse direction with respect to the overload of the motor when the headrest is stored. It is automatically returned to the support position. That is, even if the headrest sandwiches luggage, foreign matter, or the like, the headrest is not stopped while being sandwiched, but is stopped after returning to the supporting position. Therefore, the mechanical lock, that is, luggage, foreign matter, and the like that have caused an overload state of the motor can be easily removed without operating the auto switch.

In addition, if the auto switch is configured so that the headrest is retracted by driving the motor only when the auto switch is continuously operated in the storage direction for a predetermined time or more, accidental operation due to instantaneous contact with the auto switch or the like can be prevented. The headrest is not retracted. Therefore, the safety and comfort of the occupant against erroneous operation of the auto switch in the storage direction are sufficiently ensured.

Furthermore, the presence or absence of a seated person is detected, and only when there is no seated person, the headrest can be stored, and when there is a seated person, even if the headrest is accidentally stored,
The storage of the headrest may be immediately stopped, and the headrest may be automatically returned to the support position. According to such a configuration, even if the auto switch is erroneously operated in the storage direction when there is a seated person, the headrest is not stored, so that the safety of the seated person against malfunction of the headrest can be sufficiently ensured.

Then, even if the occupant is detected when the headrest is stored, the headrest is automatically returned to the supporting position immediately, so that the occupant does not come into contact with the occupant. In this respect, the safety of the occupant is ensured.

In addition, the opening of the corresponding door is detected, the headrest can be stored only when the door is closed, and when the door is opened, the headrest is automatically returned to the supporting position when the headrest is in the storage position. It may be configured. According to such a configuration, the safety of the occupant can be further ensured, and the headrest is automatically returned to the support position by opening the door without operating the auto switch. Riding can be performed without hindrance, and good riding performance can be sufficiently obtained.

And according to the headrest control device of the present invention,
The above-described headrest control method can be appropriately performed, the luggage, foreign matter, and the like that have caused the overload state of the motor can be easily removed, and the erroneous operation of the auto switch can be sufficiently prevented. Therefore, the safety of the motor and the safety and comfort for the occupant can be sufficiently ensured.

[Brief description of the 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 focusing on a central processing unit, FIG. 3 is a schematic perspective view of an assistant seat, and FIG. 4 is a flowchart of a headrest control method according to the present invention. 10: headrest control device, 12: motor, 14: auto switch, 16: central processing unit, 18: discrimination circuit, 20: overload detection means, 22: headrest, 24: assistant seat,
34: microcomputer, 40: timer,
42: Overcurrent detection resistor, 48: Seating detection means (seating sensor),
50: door detection means (door switch), 52: front door.

Claims (8)

(57) [Claims] 1. A headrest control method for controlling movement of a headrest between a stowed position for securing a field of view and a support position for supporting a head of a seated person, comprising: detecting an overload state of a motor; If a motor overload condition is detected during storage, the motor will immediately drive in the reverse direction and the headrest will automatically return to the support position, and the motor overload condition will be detected when the headrest returns to the support position. Then, the motor is immediately stopped, and the headrest is stopped at that position. 2. The headrest control method according to claim 1, wherein the motor is driven and the headrest is retracted only when the auto switch for controlling the drive of the motor is continuously operated in the storage direction for a predetermined time or more. . 3. When the presence or absence of a occupant is detected, and only when there is no occupant, the headrest is stored by operating the auto switch in the storage direction, and when the occupant is present, the headrest is stored. 3. The headrest control method according to claim 1, wherein the headrest is automatically returned immediately to the support position. 4. The headrest is retracted only when the door is closed, and the headrest is retracted only when the door is closed. When the door is opened and the headrest is in the retracted position, the headrest is opened simultaneously with the opening of the door. 4. The headrest control method according to claim 1, wherein the headrest is automatically returned to the support position immediately. The headrest is detected only when there is no occupant, the door is closed, and the auto switch is turned off in the return direction. The headrest control method according to claim 1, wherein the headrest is stored. 6. A headrest provided at an upper end of a seat back and supporting a head of a seated person and movable between a storage position below a line of sight, a motor for moving the headrest, An auto switch that controls the driving of the motor to store and restore the headrest, and processes the input information according to a predetermined program,
A central processing unit that controls the driving of the motor; an overload detecting unit that detects an overload state of the motor; and a determination circuit that determines whether the motor is being driven under predetermined safety conditions. If the motor is overloaded when the headrest is retracted, the motor is immediately driven in the reverse direction to automatically return the headrest to the support position, and the motor is overloaded when the headrest returns to the support position. A headrest control device that immediately stops the motor and stops the headrest at that position in a load state. 7. The headrest control device according to claim 6, wherein the overload detection means includes an overcurrent detection resistor for detecting an overload state of the motor from an overcurrent flowing through the motor. 8. The headrest control device according to claim 6, further comprising at least one of seat detection means for detecting the presence or absence of a seated person and door detection means for detecting opening of a corresponding door.