JPH0620852B2 - Electric headrest device for vehicles - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved control of an electric headrest device, particularly a headrest device mounted on a seat such as a passenger seat of a passenger car.

[Prior Art] Conventionally, a headrest that supports an occupant's head is attached to an upper portion of a backrest portion of a front seat of a passenger car. This headrest suppresses the rearward leaning of the head of the occupant to improve the riding comfort, and prevents or reduces obstacles to the head of the occupant during a rear-end collision.

Such headrests hinder forward visibility for rear seat occupants, and when there is no passenger in the passenger seat, it is desirable to move the headrest position to improve the forward visibility of rear seat occupants. There is.

Based on this request, Japanese Patent Laid-Open No. 59-14530 discloses a headrest device in which a support stay can be raised and lowered so that when the headrest is pulled up to a predetermined position, it can be tilted forward or backward of the seat. There is.

Further, in Japanese Patent Laid-Open No. 61-37549, there is disclosed a power seat device for automatically bringing a vehicle seat into a full flat state or a facing state, which is a facing state when a seated state or a luggage or a person is around the seat. There is disclosed a power seat device that can be controlled so as not to be in a full-flat state. Then, in the operating process of the power seat device, a drive mechanism and an operating process thereof are disclosed in order to automatically perform an up-and-down operation and a rotating operation of the headrest.

[Problems to be Solved by the Invention] The headrest device disclosed in Japanese Patent Laid-Open No. 59-14530 has the same purpose as that of the present application to widen the forward field of view of the rear seat occupant. Had to be performed manually, and the operability was poor, and there was a problem that a quick response could not be taken when a passenger gets on or off the passenger seat.

Further, in the power seat device disclosed in Japanese Patent Laid-Open No. 61-37549, an automatic position moving operation of the headrest is performed, but this is not an operation performed for the purpose of expanding the occupant's view of the seat behind, but the seat is fully opened. This is performed as one operation in the case of flattening or in the face-to-face state, and in particular, a switch for vertically moving the headrest, a switch for raising and lowering, and the like are not provided. Therefore, there has been a problem that the position of the headrest cannot be automatically and easily operated in order to expand the visual field of the occupant in the rear seat.

In addition, if a switch is provided to move the headrest up or down or to perform an inverted start operation, interruption of the inverted start operation,
Alternatively, in the case where an erroneous operation is performed during a fall-start operation, it has been demanded to automatically return the headrest to the state before the fall-start operation in order to prevent a malfunction due to an abnormal operation.

OBJECT OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to easily perform a vertical movement of a headrest and a tilting / returning operation (falling start operation) by a simple switch operation. An object of the present invention is to provide an electric headrest device for a vehicle, which can automatically return the headrest to the state before the inversion operation when the activation operation is interrupted or the switch is erroneously operated during the inversion operation.

[Means for Solving the Problems] In order to achieve the above-mentioned object, an electric headrest device for a vehicle according to the present invention includes a tilting switch for actuating a headrest of a seat to tilt down, and an instruction of the tilting switch to cause the above-mentioned The head-rest operation drive section that causes the headrest to operate in an inverted manner, the switch operation interruption detection section that detects this interruption when this inversion switch operation is interrupted, and the above-mentioned headrest when the interruption of this switch operation is detected. It is characterized in that it includes a return control unit for returning to a state before a fall-start operation.

Further, the electric headrest device for a vehicle according to the present invention includes a vertical adjustment switch for vertically moving the headrest of the seat, a vertical movement drive unit for vertically moving the headrest according to an instruction of the vertical adjustment switch, and a tilting operation of the headrest. An inversion switch for starting operation, an inversion operation drive section for inactivating the headrest in response to an instruction of the inversion switch, and an erroneous operation state in which the above switch operation is operated during operation of the inversion switch. The erroneous operation detecting section and the return control section for returning the headrest to the state before the tilting start operation when the erroneous operation is detected.

[Operation] According to the above configuration, the position of the headrest in the vertical movement region can be arbitrarily selected by operating the up / down adjustment switch, and the headrest can be fully moved from the top dead center position by operating the inversion switch. By moving and positioning to the tilted position, the returning operation from the fully tiltable position to the bottom dead center returning position can be automatically performed.

In addition, if the tilt start operation is interrupted when the headrest is turned up by operating the up / down switch, or if an incorrect operation of the up / down adjustment switch is performed during the down start operation, the up / down start operation is performed. The headrest can be automatically returned to the state before the start of the fall-start operation by detecting an interruption or an erroneous operation.

[Embodiment] FIG. 1 is a circuit configuration diagram showing an embodiment of an electric headrest device for a vehicle according to the present invention, and its main constituent elements are for vertically and vertically activating a headrest (not shown). Headrest drive unit 10, an up-down adjustment switch 12 for instructing the headrest drive unit 10 to move up and down, an upright switch 14 for instructing the headrest drive unit 10 to perform a headrest tilting operation and a returning operation, a current position of the headrest, and a headrest attached A state detection sensor group 16 for detecting the use state of the seat, the vertical adjustment switch 12, an upright switch 14, and a state detection sensor group 16
There is provided a condition calculation unit 18 which receives an instruction input and a detection signal from the device, performs a predetermined condition calculation, and supplies the headrest drive unit 10 with a vertical movement signal and a fall start operation signal.

Each of these main components is the ignition switch 20.
The battery 22 which is a power supply source
It is connected to the.

The main components will be described below.

Headrest Drive Unit The headrest drive unit 10 has a headrest motor 24, and by adjusting the rotational direction of the headrest motor 24, the headrest drive unit 10 performs vertical drive and tilt drive. In order to adjust the rotation direction of the headrest motor 24, the headrest drive unit 10 is provided with a pair of switching elements, coils and relays.

That is, when the transistor Tr1 is turned on by the signal from the condition calculation unit 18, the coil 26 becomes conductive,
The relay 28 is switched from the contact A side to the contact B side. As a result, current is supplied to the headrest motor 24 from the battery 22 in the direction of arrow 100. The headrest motor 24 performs rotational driving for raising or lowering the headrest.

Further, when the control signal is supplied from the condition calculation unit 18 to the transistor Tr2 side, the transistor Tr2 is turned on, the coil 30 is brought into a conductive state, and the relay 32 is switched from the contact C side to the contact D side, the headrest motor 24 is Current is supplied from the battery 22 in the direction of the arrow 200, whereby the headrest motor 24 is rotationally driven to perform the lowering operation or the returning operation of the headrest.

FIG. 2 shows a drive mechanism of the headrest that is actually attached to the seat in order to drive the headrest by driving the headrest motor 24. Headrest 3
4 is attached to a pair of headrest stays 36, and resin pieces 38 are attached to the lower ends of the headrest stays 36, respectively.

The resin piece 38 is connected and fixed by a control shaft 40 provided in the vertical direction with respect to the headrest stay 36. A nut 42 is attached to a screw shaft 44 provided in parallel with the headrest stay 36 at approximately the center of the control shaft 40.

The nut 42 is rotationally driven by the worm gear portion 46 and moves up and down with the screw shaft 44 as an axis. As the nut 42 moves up and down, the resin piece 38 to which the headrest stay 36 is attached slides up and down in the rail 48. This allows the headrest 3
4 makes one predetermined movement.

The rotation of the worm gear portion 46 is performed by the headrest motor 24 provided inside the seat.

Vertical adjustment switch The vertical adjustment switch 12 is a switch for performing switching operation of each operation of upward driving, downward driving, or stopping of the headrest 34, and a contact E for upward driving, a contact F for downward driving, and the headrest 34. 3 in neutral position to stop
It is configured so that switching can be performed at points.

FIG. 3 is a diagram showing an actual mounting position of the vertical adjustment switch 12, and FIG. 3 (A) is a perspective view of a passenger seat.

The vertical adjustment switch 12 is attached to the side surface of the seat of the seat together with other seat adjustment switches and levers.

FIG. 3 (B) is an enlarged view of the vertical adjustment switch 12,
By moving the switch to the upper side, the lower side, or the intermediate position, the headrest 34 is driven upward, downward, or stopped, respectively. FIG. 4 is a partial cross-sectional view of the headrest drive mechanism, showing the operation of the resin piece 38 and the headrest stay 36 within the rail 48.
The positions of the resin piece 38 and the headrest stay 36, which are indicated by broken lines in the figure, indicate the bottom dead center position Y that is the lowest, and the position that is indicated by the solid line is the top dead center position X that is the highest. Shows.

The vertical movement of the nut 42 causes the control shaft 40 to move.
Move up and down, and along with this, the resin piece 38 moves the rail 4
The headrest 34 is vertically driven in a vertical movement region between the top dead center position X and the bottom dead center position Y by sliding up and down in the vertical direction.

Inclination switch The inversion switch 14 causes the headrest 34 to move from its current position to a fully retractable position in which the headrest 34 is completely retracted further toward the front of the seat from the top dead center position. It is a switch for returning the headrest 34 to the point position and is configured as a single contact on / off switch.

FIG. 5 is a diagram showing an actual mounting position of the upright switch 14, and FIG. 5 (A) is a partial perspective view of the passenger seat. The upright switch 14 is attached to a side portion of the seat back portion, and is configured as a push button type switch as shown in a partially enlarged view of FIG. 5 (B).

By the on / off operation of the tilting switch 14, the tilting operation of the headrest 34 to the full tilting position Z and the returning operation from the full tilting position Z to the bottom dead center position Y are performed.

FIG. 6 is a partial cross-sectional view of the headrest drive mechanism for explaining the operation from the top dead center position X to the fully retractable position Z during the tilting operation, and the resin piece 38 at the top dead center position X.
When the control shaft 40 is further moved in the upward direction by the ON operation of the upright switch 14 (indicated by a broken line in the figure), the control shaft 40 slides on the upper curved portion of the rail 48 and rotates left. Along with this, the headrest stay 36 falls forward of the seat and finally reaches the fully retractable position Z (the position shown by the solid line in the figure).

State Detection Sensor Group The state detection sensor group 16 detects the first limit switch 50 and the second limit switch 52 for detecting the current position of the headrest 34, and the utilization state of the passenger seat to which the headrest 34 is attached. Passenger seat buckle switch 54 and passenger seat courtesy switch 56 for
It consists of and.

FIG. 7 is a diagram showing ON / OFF regions of the first and second limit switches 50 and 52. The first limit switch 50 is used until the headrest 34 reaches the top dead center position from the bottom dead center position. It is turned on during the interval, turned off when reaching the top dead center position, and turned off during the tilting operation from the top dead center position and at the fully retractable position.

On the other hand, the second limit switch 52 controls the headrest 34.
Is off when it is at the bottom dead center position, and is on until it goes up from the bottom dead center position, passes through the top dead center position, and reaches the full retractable position. When it reaches the fully retractable position, it turns off.

The on / off signals of the first limit switch 50 and the second limit switch 52 are supplied to the condition calculation unit 18,
The condition calculator 18 detects the current position of the headrest 34 based on this signal. That is, when the first limit switch 50 is on and the second limit switch 52 is off, the headrest 34 is at the bottom dead center position, and when both the first limit switch 50 and the second limit switch 52 are on, the headrest 34 is on. Is in the vertical movement region between the bottom dead center position and the top dead center position.

Then, it is determined that the time when the limit switch 50 is turned off reaches the top dead center position.

While the headrest 34 is tilting forward from the top dead center position, the first limit switch 50 is off, the second limit switch 52 is on, and the headrest 34 is off when the second limit switch is off. Is judged to have reached the fully retractable position.

The passenger seat buckle switch 54 is for determining the presence or absence of an occupant in the passenger seat by detecting whether or not the seat belt is used, and is turned on when the passenger seat occupant is using the seat belt, and when not in use. It is off. Then, this on / off signal is supplied to the condition calculation unit 18.

The passenger seat courtesy switch 56 detects the opening / closing state of the passenger seat side door, and is turned on when the door is opened and turned off when the door is closed. The courtesy switch 56 functions as a switch for predicting that a person will get into the passenger seat after the door is opened.

Condition Operation Unit The condition operation unit 18 includes an upper drive circuit 58 and a lower drive circuit 6
0, the tilting drive circuit 62, the return circuit 64, and the operation stop circuit 66.

Each circuit will be described below.

The upper drive circuit 58 outputs a signal for turning on the transistor Tr1 of the headrest drive unit 10 when the vertical adjustment switch 12 is switched to the upper drive contact E and the input detection signal satisfies a predetermined condition. Circuit.

As a result, the relay 28 is switched to the contact B side,
From the battery 22 to the power seat motor 24, the arrow 10
The electric current in the 0 direction is supplied, and the motor 24 is rotationally driven to raise the headrest 34.

Next, in the lower drive circuit 60, when the up / down adjustment switch is switched to the contact F side for lower drive, and another detection signal input to the lower drive circuit 60 is under a predetermined condition, the transistor Tr2 of the headrest drive unit 10 is It outputs a signal for turning on the. When the transistor Tr2 is turned on and the coil 30 becomes conductive, the relay 32 is switched to the contact D side. As a result, the power seat motor 24 is supplied with a current in the direction of the arrow 200 from the battery 22, and the motor 24 performs rotational driving for processing the headrest 34.

Next, the tiltable drive circuit 62 turns on the transistor Tr1 of the headrest drive unit 10 when the tilt-up switch 14 is turned on and the detection signals input to the tiltable drive circuit 62 are in a predetermined condition. Is a circuit that outputs the signal.

As a result, the relay 28 is switched to the contact B side as in the case of the raising operation of the headrest 34, and the motor 24 is supplied with current in the direction of arrow 100 and rotationally driven.

By the rotational driving of the motor 24, a tilting operation is performed in which the headrest 34 is tilted further toward the front of the seat after passing through the top dead center position.

Next, the return circuit 64 outputs a signal for turning on the transistor Tr2 of the headrest drive unit 10 under a certain condition when the headrest 34 is in the fully retractable position and the tilting switch 14 is turned on. It is a circuit to do.

As a result, a current in the direction of the arrow 200 is supplied to the power seat motor 24 in the same manner as when the headrest 34 descends, and the headrest 34 rises from the fully retractable position to the upper fulcrum position and descends to the bottom dead center return position. . In addition, this auto return circuit 64 is
In addition to the returning operation of the headrest 34 by the ON switch of the above, the headrest device is smoothly operated for the safety of the occupant based on the change of the seat utilization state detection signal supplied from the state detection sensor group 16 or the changes of various switches. It has an auto return function that lowers the headrest to the bottom dead center return position to ensure

This auto-return function outputs a signal for turning on the transistor Tr2 of the headrest drive unit 10 when the detection signals input to the return circuit 64 are in a predetermined condition, thereby lowering the headrest 34. is there.

Further, the operation stop circuit 66 is a circuit which outputs a stop signal to each of the other circuits when an erroneous operation or other wrong switch operation is performed due to mischief while the headrest 34 is performing a predetermined operation. Is.

A delay circuit 68 for 0.2 seconds is provided between the tilt-up switch 14 and the tilting drive circuit 12 and the return circuit 64 to prevent malfunction, and the delay circuit 68 is turned on / off after the tilt-up switch 14 is turned on / off. A signal is supplied to each circuit with a delay of 2 seconds.

A 20-second timer 70 is connected between the upper drive circuit 58 and the tiltable drive circuit 62 and the transistor Tr1 of the headrest drive unit 10, and the lower drive circuit 60 and the return circuit 64 and the transistor Tr2 of the headrest drive unit 10 are connected.
A 20-second timer 72 is connected between and. These 20-second timers 70 and 72 are provided to prevent the motor 24 from heating when the headrest is forcibly stopped by a foreign substance or the like during upward / downward driving of the headrest or tilting / returning driving. It is provided to turn off the transistors Tr1 and Tr2 for 20 seconds after being turned on.

A 0.5 second timer 74 and a transistor Tr3 are connected to the output side of the foldable drive circuit 62.
Based on the output from 2, the transistor Tr3 is turned on for 0.5 second, and the buzzer 76 is struck for 0.5 second.

Overall Operation Hereinafter, the overall operation of the upper and lower adjusting action and the tilting / returning action of the headrest 34 by the apparatus of the embodiment will be described in the flowcharts of FIGS. 8 and 9 and the partial configuration diagrams of the circuits of FIGS. 10 to 17. It will be explained based on.

Upward Adjustment Operation FIG. 8 shows a flow chart of the vertical adjustment operation of the headrest 34. After the start, it is first determined whether or not the ignition switch 20 is on (S101). When the ignition switch is off, the power seat motor 24 maintains the stopped state even if the up / down adjustment switch 12 is turned on or off (S102) (S103).

When the ignition switch 20 is turned on and the vertical adjustment switch 12 is turned on (S104), the headrest 34 is positioned in the vertical movement region, that is, the region between the top dead center position and the bottom dead center position. It is determined whether or not there is (S1
05). Here, when the headrest 34 is not in the vertical movement region (N in S105), the motor 24 maintains the stopped state (S103).

When the headrest 34 is in the vertical movement region (Y in S105), it is determined whether the vertical adjustment switch 12 is in the upward mode or the downward mode (S106, S107). When the up / down adjustment switch 12 is switched to the upper drive side, it is first determined whether or not the upright switch 14 is turned on as a condition for performing the upward rotation of the motor 24 (S108). When the upright switch 14 is turned on (Y in S108), the motor 24
Is stopped (S109).

When the inversion switch 14 is not turned on (S108 is N), the relay 28 is turned on to supply current for rotating the motor 24 in the upward direction (switched to the contact B side (S110)).

Next, it is determined whether 20 seconds have elapsed after the motor 24 started to rotate upward (S111) and whether the headrest 34 has reached the top dead center position (S112). It is determined by the 20-second timer 70 whether or not 20 seconds have elapsed, and whether the headrest 34 reaches the top dead center position is determined by the first
It is determined by whether the limit switch 50 is turned off. 2 before the headrest 34 reaches the top dead center position
When 0 seconds have elapsed, the motor 24 is stopped (S1
09).

The motor 24 is also stopped when the headrest 34 reaches the top dead center position before 20 seconds have elapsed (S10).
9).

Until the headrest 34 reaches the top dead center position, it is constantly determined whether or not the upward mode of the vertical adjustment switch 12 is selected (S113), and when the upward mode is switched to the stop mode ( When S113 is N), the motor 24 is stopped at that time (S109).
Even when the vertical adjustment switch 12 maintains the upward mode, the on / off state of the ignition switch 20 is always determined (S114). Ignition switch 2
When 0 is turned off, the motor 24 is stopped (S1
09). Then, while the upper mode of the vertical adjustment switch 12 and the ON state of the ignition switch 20 are maintained (Y in S113 and S114), the upward rotation of the motor 24 is continued.

FIG. 10 is a diagram showing a circuit component operated in the above-described upward adjustment. In the upward drive circuit 58, the ignition switch 20 is turned on, the vertical adjustment switch 12 is connected to the contact E side, and 1 limit switch 5
When 0 is on, that is, when the headrest 34 is in the vertical movement region, a signal for turning on the relay 28 is output.

Therefore, when the ignition switch 20 is in the OFF state, or when the headrest 34 is not in the vertical movement region, the upward movement of the headrest 34 by the vertical adjustment switch 12 cannot be performed.

In addition, the operation stop circuit 66 operates when the inversion switch 14 is turned on in S108,
When the upper mode of the up / down adjustment switch 12 is selected, a stop signal is output to the upper drive circuit 58 in order to stop the motor 24 when the inversion switch 14 is simultaneously turned on by, for example, mischief.

Downward adjustment operation When the lower mode of the up / down adjustment switch 12 is selected in S107 (FIG. 8), whether or not the upright switch 14 is turned on as a precondition for the motor rotation drive as in the case of the up adjustment operation. Is determined (S
115). When the upright switch 14 is turned on (S
115Y), the motor 24 is stopped (S116).
When the upright switch 14 is not turned on (S
115 is N), the relay 32 is switched on to the contact D side, and the motor 24 is turned on.
4 is driven to rotate downward (S11
7).

After the downward rotation of the motor 24 is started, it is determined whether 20 seconds have elapsed (S118) and whether the headrest 34 has reached the bottom dead center position (S119). When 20 seconds elapse before the headrest 34 reaches the bottom dead center position (S118 is Y), the motor 24 is stopped (S116), and when the bottom dead center position is reached before 20 seconds elapse (S119: Also in Y), the motor 24 is stopped (11
6). It is determined whether or not the downward mode of the vertical adjustment switch 12 is maintained for 20 seconds after starting the downward rotation of the motor 24 and during the time when the bottom dead center position is reached (S120), and the ignition is performed. The determination as to whether the switch is in the ON state (S121) is always performed. When the up / down adjustment switch 12 is switched from the downward mode to the stop mode and when the ignition switch 20 is turned off, the motor 2
4 is immediately stopped (S116). Then, when the downward mode of the vertical adjustment switch 12 is maintained and the ignition switch 20 is turned on, the motor 2
4 downward rotation drive is continued.

FIG. 11 is a diagram showing a rotary component operated in the above-described downward adjustment operation. In the downward drive circuit 60, the ignition switch 20 is turned on and the vertical adjustment switch 12 is turned on.
Is connected to the contact F side in the lower mode, and when the second limit switch 52 is on (when the headrest 34 is at a position other than the bottom dead center position), the relay 32 is switched to the contact D side to turn on the signal. Then, the motor 24 is driven to rotate downward.

The operation stop circuit 66 is similar to that at the time of the above-mentioned upward adjustment operation,
When the lower mode of the vertical adjustment switch 12 is selected and the upright switch 14 is turned on during the downward adjustment, the motor 24
Is output to the lower drive circuit 60.

Tilting / Returning Operation FIG. 9 is a flowchart showing a series of tilting / youngening operations. After the start, it is first determined whether or not the headrest 34 is at the fully retractable position (S20).
1). If the headrest 34 is not in the fully retractable position (N in S201), the ignition switch 2
It is determined whether 0 is turned on (S202) and whether the upright switch 14 is turned on (S20).
3) is performed and both are turned on again, the headrest 3
It is determined whether or not 4 is in the fully retractable position (S20).
4). Here, it is determined whether or not the passenger seat courtesy switch 56 is on (S205) and the passenger seat buckle switch 54.
Is turned on (S206), and if neither switch is turned on, it is further determined whether or not the inversion switch 14 is turned on for 0.2 seconds or longer. (S207), when turned on,
The relay 28 of the headrest drive unit 10 is switched to the B contact side and turned on, and the motor 24 starts driving in the rotation direction for tilting and operating the headrest 34 (S2).
08).

When it is determined in S201 that the headrest 34 is not in the fully retractable position (N), the ignition switch 20 is not turned on (N in S202), and the upright switch 14 is not turned on (N in S203 is N). )
Indicates that the motor 24 is stopped (S209), the passenger seat courtesy switch is on (S205 is (Y)), or the passenger seat buckle switch 54 is on (S206 is Y). , Further upright switch 14
Is not turned on for 0.2 seconds or longer (N in S207)
In any case, the motor 24 maintains the stopped state (S209).

In S208, it is determined whether or not the tilt switch 14 is continuously turned on after the driving of the motor 24 is started (S20).
1), it is determined whether or not the passenger seat courtesy switch 56 is turned on (S211), and whether or not the passenger seat buckle switch 54 is not turned on and movable (S212).
Is performed, and the on-state switch 14 is kept on (S
209 is Y), the passenger seat courtesy switch 56 and the passenger seat buckle switch 54 are not both turned on (S211 and S212 are N), the motor rotation drive for the tilting operation of the headrest 34 is continued.

Then, it is determined whether or not 20 seconds have passed since the relay 28 was turned on (S213). That is, headrest 3
When 20 seconds have passed before the vehicle 4 reaches the fully retractable position by the tilting operation (Y in S213), the motor 24 is stopped (S214). The determination as to whether or not this 20 seconds has elapsed is 20
This is performed by the second timer 70 to prevent heating of the motor when the headrest is forcibly stopped by foreign matter or the like as in the vertical adjustment operation.

Further, during the tilting operation of the headrest 34, it is determined whether or not the vertical adjustment switch 12 has been turned on in the upward mode or the downward mode (S215), and when the on operation is performed, the headrest 34 is further moved. It is determined whether or not it is in the vertical movement area (S216). That is, when the vertical adjustment switch 12 is turned on during the tilting operation and the headrest 34 is in the vertical movement region at that time (Y in S216), the motor 24 is stopped (S214).

On the other hand, when 20 seconds have not elapsed during the tilting operation (S213 is N) and the up-down adjustment switch 12 has not been turned on (S215 is N), it is determined whether the headrest 34 is in the fully tiltable position. Is performed (S21
7).

When the headrest 34 has not reached the fully retractable position, the motor continues to rotate in the tilting direction (S208), and when it reaches the fully retractable position, the tilting operation ends and the motor 24 Stops (S218). At this time, the 0.5 second timer 74 is activated, the transistor Tr3 is turned on, and the buzzer 76 sounds for 0.5 second (S219).

12 and 13 are partial block diagrams of a circuit that operates during the above-mentioned tilting operation. First, in FIG.
In the tiltable drive circuit 62, the ignition switch 20 is turned on, the tilting switch 14 is turned on for 0.2 seconds or more, and one of the first limit switch 50 and the second limit switch 52 is turned on. On condition that both the passenger seat buckle switch 54 and the passenger seat courtesy switch 56 are off, the relay 28 is switched to the contact B side and turned on to drive the motor 24 in the same rotation direction as the rotation direction during upward driving.

That is, the ignition switch 20 is turned on,
The headrest 34 is located at a position other than the fully retractable position,
Further, when the passenger is not in the passenger seat, the passenger buckle switch is not used, and the passenger door is not open, the headrest 34 is tilted.

The fact that the passenger's seat buckle switch 54 and the passenger seat courtesy switch 56 are in the OFF state is a condition for the tilting operation. When the passenger is in the passenger seat, the headrest is moved to the passenger's seat passenger by performing the tilting operation. This is to prevent collision.

In order to prevent a signal for turning on the relay 28 from being output from the tilting drive circuit 62 when the tilting switch 14 is accidentally turned on, the tilt switch 14 and the tilting drive circuit 6 are provided.
A delay circuit 68 is provided between the two. Inversion switch 14
The relay 28 is prevented from being turned on unless it is turned on for 0.2 seconds or more.

Next, FIG. 13 shows the operation of the circuit when the headrest 34 reaches the fully retractable position. When the headrest 34 reaches the fully retractable position, the first limit switch 50 and the second limit switch 52 are shown. Are both off. The tiltable drive circuit 62 stops the supply of the signal for turning on the transistor Tr1 of the headrest drive unit 10 by the OFF signal from these limit switches and switches the relay 28 from the contact B side to the contact A side to turn it off.

The foldable drive circuit 62 activates the 0.5 second timer 74 at the same time when the relay 28 is turned off, and turns on the transistor Tr3 for 0.5 second to turn on the buzzer 76.
Blow for 5 seconds.

This allows the occupant who has performed the tilting operation of the headrest 34 to recognize that the headrest 34 has reached the fully retractable position.

Headrest return operation The headrest 34 return operation is performed by the inversion switch 14
For the return operation due to the ON operation of the switch, and for the malfunction of the switch and the safety of the passenger seat occupant, the headrest 34 is automatically returned to the bottom dead center position regardless of the ON / OFF state of the ignition switch 20 under a predetermined condition. There is an auto return operation.

Return Operation by Inverting Switch Operation First, the return operation by operating the inversion switch 14 is S2.
In 04 (FIG. 9), when the headrest 34 is in the fully retractable position (Y in S204), it is determined whether or not the tilting switch 14 is turned on for 0.2 seconds or more (S22).
0), when it is turned on for 0.2 seconds or longer (S220 is Y), the relay 32 is operated to return the headrest 34.
Is switched on to the contact D side to be turned on and the motor 2
4 is rotationally driven in the return direction (S221).

FIG. 14 shows a partial configuration that operates when the return operation is performed by operating the inversion switch 14. In the return circuit 64, the ignition switch 20 is turned on and the first limit switch 50 and the second limit switch 52 are turned on. When both are in the off state, the relay 32 is set to the contact D when the inversion switch 14 is turned on for 0.2 seconds or more.
The signal for switching on is output to the side. That is, the returning operation of the headrest 34 by the operation of the tilting switch 14 can be performed only when the headrest 34 is in the fully tiltable position on condition that the ignition switch is on.

By this returning operation, the headrest 34 is returned until it reaches the bottom dead center position.

Auto Return Operation First Auto Return Operation In step 201 (FIG. 9), the headrest 34
Is in the fully retractable position (Y in S201), it is determined whether or not the passenger seat courtesy swiss switch 56 is turned on (S2).
01A) and whether or not the passenger seat buckle switch 54 is turned on (S201B), and when either one is turned on (S201A or S201B is Y), the relay 32 is turned on and the motor 24 is rotationally driven in the direction of returning the headrest 34 (S2).
21).

FIG. 15 shows a partial configuration of a circuit that operates when the first auto-return operation is performed. The return circuit 64 has the first limit switch 50 and the second limit switch 52 both turned off. When either the passenger seat buckle switch 54 or the passenger seat courtesy switch 56 is turned on, a signal for turning on the relay 32 is output. That is, when the passenger seat door is opened or the plate is inserted into the seat belt buckle on the passenger seat side when the headrest 34 is in the fully retractable position, the headrest returns from the fully retractable state to the bottom dead center position. Let This indicates that the passenger seat buckle switch 54 being turned on indicates that the passenger has boarded the passenger seat,
In this case, if the headrest 34 is in a fully retractable state, the headrest 34 will hit the head of the occupant, so the headrest 34 is automatically returned.

Also, when the passenger side door is opened, the courtesy switch 5
Although 6 is turned on, in this case, it is considered that the upper body is about to get into the passenger seat, and in this case also, the headrest 34 is automatically returned.

Second Auto Return Operation In step 208 (FIG. 9), when the tilting operation of the headrest 34 is performed while the relay 28 is on, the tilting switch 14 is turned off, that is, the tilting switch 14 is turned on. When you release your hand from the pushed state (S2
10 is N), the relay 32 is turned on, and the motor 24 is rotationally driven to return the headrest (S22).
1).

Third Auto Return Operation Further, similarly to the second auto return operation described above, when the headrest 34 is being tilted (S20).
8) When either the passenger seat courtesy switch 56 or the passenger seat buckle switch 54 is turned on (S211 or S212 is Y), the relay 32 is turned on and the motor 24 is
Rotational drive is performed to return the headrest 34 (S221).

Fourth Auto Return Operation Similar to the second and third auto return operations, when the relay 28 is on and the headrest 34 is being tilted (S208), the vertical adjustment switch 12 is turned on. (S215 is Y), and it is determined that the headrest 34 is not in the vertical movement region (S21
6 is N), the relay 32 is turned on, and the motor 24 is driven to return and rotate (S212).

If it is determined in S216 that the headrest 34 is in the vertical movement region (Y in S216), the motor 2
4 is stopped (S214).

FIG. 16 is a diagram showing a partial configuration of a circuit that operates when the second to fourth auto-return operations are performed,
During the tilting operation of the headrest 34 (before the headrest 34 reaches the fully tiltable position), when the tilting switch 14 is turned off, the signal for turning on the relay 28 is stopped from the tilting drive circuit 62.

Then, a return signal is supplied from the auto return trigger circuit 80 to the return circuit 64, which is connected to the inversion switch 14 via the auto return trigger circuit 80, based on the inversion switch 14 being turned off, 64 outputs a signal for turning on the relay 32 (S221 in FIG. 9). The return circuit 64 receives the return signal from the auto-return trigger circuit 80 so that the headrest 34 reaches the bottom dead center position (when the first limit switch 50 is on and the second limit switch 52 is off). The relay 32 is kept on until the operation stop circuit 66 operates and supplies a stop signal to the return circuit 64.

When the passenger seat buckle switch 54 is turned on or the passenger seat courtesy switch 56 is turned on during the tilting operation of the headrest 34, the folding drive circuit 62 also stops the output of the ON signal of the relay 28. On the other hand, return circuit 6
4 is a relay 3 by the ON signal of both switches 54 or 56
A signal for turning on 2 is output and the headrest 34 is returned (S221 in FIG. 9).

Further, when the vertical adjustment switch 12 (not shown) is operated during the tilting operation of the headrest 34, when the headrest 34 is in the vertical movement region (S216 is Y), the operation stop circuit 66 sends a stop signal to the tiltable drive circuit 62. Output relay 28
Is turned off and the motor 24 is stopped. When the headrest 34 is located between the top dead center and the fully retractable position when the vertical adjustment switch 12 is operated (the first limit switch 50
Is off and the second limit switch 52 is on), the return circuit 64 outputs a signal to turn on the relay 32 and causes the headrest 34 to return (S215: N → N).
S221).

Operation after start of return operation Next, based on the flowchart of FIG.
The operation after the switch is turned on and the motor 24 starts the return rotation drive (after S221) will be described.

During the return operation, it is determined whether the upright switch 14 is turned on (S222) and whether the up-down adjustment switch 12 is turned on (S223), and if any of the switches is turned on ( When S222 or S223 is Y), it is further determined whether or not the headrest 34 is in the vertical movement region (S224), and when it is not in the vertical movement region (S224 is N), the return operation of the motor 24 is performed. It is further continued (S221). Then, when the headrest 34 is within the vertical movement region (Y in S224), the motor 24 is stopped (S225).

Further, during the return operation, it is determined whether 20 seconds have passed after the relay 32 was turned on (S22).
6) When 20 seconds have passed before the headrest reaches the bottom dead center position (Y in S226), the motor 24 is stopped (S227).

It is judged whether or not the headrest 34 reaches the bottom dead center 20 seconds after the relay 32 is turned on (S22).
8) When the bottom dead center is reached, the return operation is completed and the motor 24 is stopped (S225).

When the motor 24 finishes the return operation and once stops,
Judgment whether or not the upright switch 14 is turned on (S2
29) and whether or not the vertical adjustment switch 12 is turned on (S230), and when the switch is still turned on (S229 or S230 is Y), the motor (24)
Remains stopped (S225). In order to drive the motor again, the upright switch 14 and the vertical adjustment switch 12 must be turned off once.

FIG. 17 shows the components of the circuit that operates in the operation after the start of the return operation, and the return circuit 64 is shown.
When the signal for turning on the relay 32 is output from the device (during the return operation), the vertical adjustment switch 12
Is turned on or the upright switch 14 is turned on and both the first limit switch 50 and the second limit switch 52 are turned on, that is, the headrest 34.
Is within the vertical movement region, the operation stop circuit 66 outputs a stop signal to the return circuit 64, and the return circuit 64
Stops the ON signal to the relay 32, and the rotation of the motor 24 is stopped. This is because the operator may want to stop the headrest 34 during the return operation.

Also, during the return operation, the vertical adjustment switch 12
Alternatively, even when the upright switch 14 is turned on, when the headrest 34 is not in the vertical movement region, the stop signal is not output from the operation stop circuit and the return operation is continued. This is because when the headrest 34 is outside the vertical movement region, that is, between the top dead center and the fully retractable position, it is not preferable that the headrest 34 is structurally unstable and that the headrest 34 stops at the semi-retractable position. Is.

[Advantages of the Invention] As described above, according to the vehicle electric headrest device of the present invention, the headrest can be set to an arbitrary position within the vertical movement region by a simple operation of the vertical adjustment switch. Further, by operating the tilting switch, the headrest can be tilted forward and returned.

As a result, the occupant in the rear seat can tilt the headrest forward of the seat with a simple switch operation, and can easily secure the front field of view.

Further, in the case where the operation of the upright switch during the head-up operation of the headrest is interrupted or the vertical adjustment switch is erroneously operated during the head-up operation, the headrest can be automatically returned to the state before the head-up operation. Therefore, it is possible to avoid a halfway state, or it is possible to solve a problem caused by performing two operations at the same time.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an overall configuration of an embodiment of the present invention, FIG. 2 is a partial cutaway view of a seat for showing a drive mechanism of a headrest, and FIG. FIG. 3 (B) is an enlarged view of the vertical adjustment switch, FIG. 4 is a partial sectional view of the headrest drive mechanism showing the vertical movement of the headrest, and FIG. 5B is an enlarged view of the tilting switch, FIG. 6 is a partial cross-sectional view of the headrest drive mechanism for explaining the tilting operation, and FIG. 7 is the limit. FIG. 8 is a diagram showing an on / off region of a switch, FIG. 8 is a flowchart of an upward / downward adjusting operation of a headrest, FIG. 9 is a flowchart of a tilting / returning operation of a headrest, and FIG. 10 is a circuit operated during upward adjustment. Partial configuration diagram, FIG. 11 is a partial configuration diagram of a circuit that operates at the time of downward adjustment, FIGS. 12 and 13 are partial configuration diagrams of a circuit that operates in a tilting operation, and FIGS. 14 to 16 show a return operation. FIG. 17 is a partial configuration diagram of the circuit that operates, and FIG. 17 is a partial configuration diagram of the circuit that operates in the operation after the return operation. 10 ... Headrest drive unit 12 ... Vertical adjustment switch 14 ... Inclination switch 16 ... Status detection sensor group 18 ... Condition calculation unit 24 ... Headrest motor 28, 32 ... Relay 50 ... First limit switch 52 ...... Second limit switch 54 …… Passenger seat buckle switch 56 …… Passenger seat courtesy switch 58 …… Upper drive circuit 60 …… Lower drive circuit 62 …… Foldable drive circuit 64 …… Return circuit 66 …… Stop circuit

Front page continued (72) Inventor Reki Kawamura 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Corporation (72) Inventor Hisatoshi Ota 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Corporation (72) Inventor Shin Aso, 1-1, Showa-cho, Kariya city, Aichi prefecture

Claims (2)

[Claims] 1. A headrest of a seat, a tilting switch for tilting and actuating the headrest, a headrest drive unit for tilting and actuating the headrest according to an instruction from the tilting switch, and interruption of the tilting switch operation. A switch operation interruption detection unit that detects a switch operation interruption, and a return control unit that returns the headrest to the state before the tilting start operation when the interruption of the tilting switch operation is detected, Headrest device. 2. A headrest of a seat, a vertical adjustment switch for vertically moving the headrest, a vertical movement drive unit for vertically moving the headrest according to an instruction from the vertical adjustment switch, and a headrest for activating the headrest. Reversing switch, a reversing starting operation drive section for reversing the headrest according to an instruction of the reversing switch, and an erroneous operation detection for detecting an erroneous operation state in which the vertical adjustment switch is operated during operation of the reversing starting operation switch. An electric headrest device for a vehicle, comprising: a unit; and a return control unit that returns the headrest to a state before a fall-start operation when the erroneous operation is detected.