KR20240005435A - Headrest vibration compensation system - Google Patents

Abstract

The present invention relates to a vibration compensation system for a headrest. More specifically, the changed rotation angle of the headrest generated in the pitch direction according to vehicle vibration is calculated and compensation is made in the reverse direction corresponding to the change in rotation angle, so that the positive function of the headrest is smooth. It is about the vibration compensation system of the headrest that allows it to function properly.
For this purpose, the present invention includes a motor unit that changes the posture of the headrest installed on the seat of the vehicle; and a control unit that controls the motor unit to compensate for a change in the posture of the headrest due to vibration based on the received posture information of the headrest, wherein the control unit determines that the received vehicle acceleration exceeds a preset threshold. In this case, compensation for changes in the posture of the headrest due to vibration is stopped, and the motor unit is controlled to return the headrest to a preset reference position.

Description

Headrest vibration compensation system {Headrest vibration compensation system}

The present invention relates to a vibration compensation system for a headrest. More specifically, the changed rotation angle of the headrest generated in the pitch direction according to vehicle vibration is calculated and compensation is made in the reverse direction by the amount of rotation angle change, so that the positive function of the headrest is smooth. It is about the vibration compensation system of the headrest that allows it to function properly.

The headrest attached to a car seat has two main functions. First, it protects the head and neck in the event of a collision.

In the event of a rear collision accident, if the headrest is missing or incorrectly installed, the neck may bend up to 180 degrees as shown in Figure 2 and the bones and ligaments inside the neck may be damaged, but if adjusted properly, the probability of injury can be effectively reduced by more than 20%. It can be reduced.

The second function is to provide the convenience of resting by leaning your head, which accounts for a significant portion of the human body. Concentrating on driving causes fatigue in your neck, shoulders, and back. At this time, you can relieve tension and keep your body comfortable by leaning your head and back.

However, even if you lean your head against the headrest while driving, continuous movement occurs due to road surface vibration, making it difficult to effectively recover from fatigue.

In addition, as shown in Figure 1, when the headrest vibrates in the pitch direction due to the vibration of the vehicle, the front part (2) of the headrest presses the back of the head, causing the head to move forward, causing fatigue to accumulate in the neck.

Additionally, since a vehicle is a rigid body, vibrations that are not absorbed by the suspension during driving are transmitted to the car body and seats, causing the headrest to vibrate. However, in the human body, vibration is absorbed by soft bones, flesh, and muscles, so the head position is almost fixed.

Therefore, when resting against the headrest, if road vibration occurs in the pitch direction, the head position is fixed, but the position of the headrest in contact changes, causing head movement, which makes it difficult to resolve fatigue and can actually aggravate it.

Korean Patent Registration No. 10-1600199 (Publication date: 2016.02.26)

The present invention was devised to solve the above problems. By calculating the changed rotation angle of the headrest that occurs in the pitch direction according to vehicle vibration, compensation is made in the reverse direction corresponding to the change in rotation angle, so that the positive function of the headrest can function smoothly. The purpose is to provide a headrest vibration compensation system that allows

In addition, another object of the present invention is to stop headrest compensation control and return to the reference position of the headrest when a vehicle acceleration exceeding a preset threshold is received or a sudden stop occurs while performing compensation for a change in the rotation angle of the headrest. The goal is to provide a vibration compensation system for the headrest that can prevent problems that increase the risk in the event of an accident by controlling the headrest.

The present invention has the following features to solve the above problems.

The present invention includes a motor unit that changes the posture of a headrest installed on a vehicle seat; and a control unit that controls the motor unit to compensate for a change in the posture of the headrest due to vibration based on the received posture information of the headrest, wherein the control unit determines that the received vehicle acceleration exceeds a preset threshold. In this case, compensation for changes in the posture of the headrest due to vibration is stopped, and the motor unit is controlled to return the headrest to a preset reference position.

Here, the headrest includes a fixed part installed on the seat and a rotating part connected to the fixed part so that it can rotate at a predetermined angle, and the posture information of the headrest is rotational angular speed information of the rotating part with respect to the fixed part. am.

Additionally, the control unit performs filtering by inputting the received rotational angular velocity information into a high-pass filter having a preset high-frequency band pass range.

In addition, the control unit calculates the rotation angle of the rotating unit based on the rotation angular speed information, and controls the motor unit to rotate the rotating unit by the rotation angle in the reverse direction based on the calculated rotation angle.

In addition, when the received vehicle acceleration does not exceed a preset threshold, the control unit compensates the rotating unit by the changed rotation angle based on the received vehicle status information or operates the motor unit to return the rotating unit to the reference position. However, the status information of the vehicle includes at least one of front object detection information, collision warning information, collision information, brake pressure information, wheel speed information for each wheel, and speed information of the vehicle.

In addition, the control unit controls the motor unit based on the received vehicle collision warning information (Forward collision warning) and the collision time (Time to collision) TTC. When the vehicle collision warning information is received, the TTC is connected to the rotating unit. If it is less than T1, which is the reference position return time, the motor unit is controlled to return the rotary unit to the reference position.

Additionally, the TTC , where L(t) is a function related to the distance from the vehicle ahead, Ve(t) is a function related to the speed of the vehicle, and Vp(t) is the speed of the vehicle ahead.

In addition, the control unit controls the motor unit to return the rotating unit to the reference position when the brake pressure exceeds a preset threshold based on the received brake pressure information of the vehicle.

According to the present invention, the change in the pitch direction rotation angle of the headrest due to vibration is detected by applying a gyro sensor, and compensation is immediately made according to the changed rotation angle, so that the occupant can effectively rest, thereby improving convenience.

In addition, in emergency situations, the headrest can be moved to the correct position to prevent injuries, thereby improving driving safety.

1 is a diagram showing a conventional headrest.
Figure 2 is a diagram schematically showing a headrest and vibration compensation system according to an embodiment of the present invention.
Figure 3 is a flowchart showing a process in which a control unit performs compensation control according to an embodiment of the present invention.

In order to explain the present invention, its operational advantages, and the purpose achieved by practicing the present invention, preferred embodiments of the present invention are illustrated and discussed with reference to them.

First, the terms used in this application are only used to describe specific embodiments and are not intended to limit the present invention, and singular expressions may include plural expressions unless the context clearly indicates otherwise. In addition, in the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other It should be understood that this does not exclude in advance the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

In describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Figure 2 is a diagram schematically showing a headrest according to an embodiment of the present invention.

Referring to the drawings, the vibration compensation system 1000 according to an embodiment of the present invention largely includes a motor unit 100 that changes the posture of the headrest 300 of the vehicle seat and the received posture information of the headrest 300. Based on this, it is configured to include a control unit 200 that controls the motor unit 100 to compensate for changes in the posture of the headrest 300 due to vibration.

Here, the motor unit 100 is configured to rotate one side of the headrest 300 in the pitch direction with respect to the other side connected thereto, as shown in FIG. 2. The headrest 300 shown in FIG. 2 is one embodiment. This is just an example, and the headrest can be configured in various ways.

In addition, the motor unit 100 can also be configured to change the posture of the headrest in various forms, such as rotation or position movement, in a specific posture, depending on the configuration of the various headrests 300.

However, since the headrest 300 according to the present invention is intended to prevent vibration in the pitch direction from being transmitted to the head of the occupant, the headrest 300 is attached to a fixture fixed to the vehicle seat as shown in FIG. 2. It consists of (310) and a rotating part (320) rotatably installed on the fixing part (310).

In addition, the motor unit 100 is connected to adjust the rotation angle of the rotating unit 320 based on the fixing unit 310.

The headrest 300 and the motor unit 100 can be configured in various ways as described above, and are capable of performing posture control of the headrest 300, especially posture control in the pitch direction. Part 100 is applicable to the vibration compensation system 1000 of the present invention.

Meanwhile, the control unit 200 is provided to control the motor unit 100 to compensate for changes in the posture of the headrest 300 due to vibration based on the received posture information of the headrest 300. This control unit ( 200 may receive posture information of the headrest 300 from a separate sensor unit 400.

This sensor unit 400 may be a gyro sensor capable of detecting the pitch direction.

In the case of the headrest 300 shown in FIG. 2, it is composed of a fixing part 310 and a rotating part 320, and the sensor unit 400 detects the rotation angle of the rotating part 320 in real time to the control unit 200. and the control unit 200 can calculate the amount of change in the rotation angle of the rotating unit 320 based on the posture detection information.

Here, when the sensor unit 400 is a gyro sensor, the attitude detection information is rotational angular velocity information in the pitch direction, and the control unit 200 receives this and filters it through a high-pass filter that passes high-frequency components to consider only small vibrations. The process can be performed.

Accordingly, the rotation angle can be calculated by accumulating the angular velocity, and the control unit 200 controls the motor unit 100 to generate a change in the reverse direction, that is, a negative rotation angle, through this rotation angle calculation.

Here, the reverse rotation angle can be applied in various ways depending on the setting. For example, the reverse rotation angle can be calculated based on the amount of change for a specific time, and the reverse rotation angle can be calculated based on a specific angle of the rotating unit 320, that is, the reference angle. It may also be possible to calculate .

Calculating the rotation angle of the control unit 200 and setting the reverse rotation angle for vibration compensation may be selectively set by the control unit 200 or the user.

Accordingly, the control unit 200 can calculate the amount of change in the rotation angle of the headrest based on the received posture detection information of the sensor unit 400, and operates the motor unit 100 to compensate for the change in the rotation angle due to vibration. It can be controlled to change to the desired reverse rotation angle.

In this way, the control unit 200 continues to compensate, or returns, the rotation angle of the rotating part 320 of the headrest 300, which is in contact with the user's head, through the motor unit 100 by the rotation angle that changes according to the vibration, so that the user can enjoy a small Although it is powerful, it is possible to be free from existing problems caused by fatigue caused by the headrest 300 continuing to press the back of the head or tremors occurring.

Meanwhile, the control unit 200 receives vehicle acceleration through a separate in-vehicle sensor system, for example, ESC (Electronic Stability Control), and when the received acceleration exceeds a preset threshold, the headrest (300) due to vibration ) stops compensating for changes in posture, and controls the motor unit 100 to return the headrest 300 to a preset reference position.

This means that when the vehicle rapidly accelerates, the occupant's body may dig into the seat and cause pressure due to the headrest 300 whose rotation angle is adjusted, and when a rapid deceleration occurs, the occupant's head may fall from the headrest and cause a collision. This is to change the headrest 300, whose rotation angle has been adjusted, to a state in which it does not protrude.

Through this, in situations where the vehicle is driving stably, occupant fatigue can be effectively relieved through vibration compensation, and when a sudden stop or collision is expected, the headrest 300 is moved to the correct position to prevent it from protruding, thereby reducing the probability of injury. It can be lowered.

In addition, if the received vehicle acceleration does not exceed a preset threshold, the control unit 200 compensates the rotating unit 320 by the changed rotation angle based on the received status information of the vehicle, or The motor unit 100 can be controlled in two modes to return to the reference position.

That is, when it is a normal driving situation and when it is not a normal driving situation but does not apply even when the vehicle acceleration exceeds the threshold as described above.

In the latter case, the motor unit 100 can be controlled based on the received forward collision warning information of the vehicle and TTC, which is the time to collision. In this case, the collision warning information of the vehicle is received. If the TTC is less than T1, which is the return time to the reference position of the rotating part, the motor unit 100 can be controlled to return the rotating part 320 to the reference position.

This is because even if the TTC is smaller than the reference position return time of the headrest 300, injuries may be worsened by the protruding headrest 300 during a collision, so the control unit 200 immediately stops vibration compensation and The motor unit 100 can be controlled to return to the reference position.

Here, the status information of the vehicle required for the judgment of the control unit 200 may include front object detection information, collision warning information, collision information, brake pressure information, wheel speed information for each wheel, and speed information of the vehicle. The TTC can be calculated through equation (1) below.

Equation (1)

Here, L(t) is a function related to the distance from the vehicle ahead, Ve(t) is a function related to the speed of the vehicle, and Vp(t) is the speed of the vehicle ahead.

In addition, the control unit 200 operates the motor unit 100 to return the rotating unit 320 to the reference position when the brake pressure exceeds a preset threshold based on the received brake pressure information of the vehicle. You can control it.

This may be a similar situation to the case where the vehicle acceleration exceeds the threshold described above, and a dangerous situation can be sufficiently detected based on this brake pressure information.

Figure 3 is a flowchart showing a process in which a control unit performs compensation control according to an embodiment of the present invention.

Let's look at the control process of the vibration compensation system according to an embodiment of the present invention with reference to the drawings. First, the control unit 200 receives the angular velocity in the pitch direction from the sensor unit installed on the headrest 300, that is, the gyro sensor. (S100), the received angular velocity information is filtered through a high-pass filter that passes only high-frequency components in order to filter out only small vibrations, and the rotation angle is calculated through the filtered angular velocity accumulation information (S110).

Accordingly, the control unit 200 controls the motor unit 100 to rotate the headrest 300 in the reverse direction based on the calculated rotation angle (S120).

In addition, the control unit 200 receives the vehicle's acceleration information from the ESC system in the vehicle (S130) and determines whether the acceleration is greater than a preset threshold (S140). If so, it immediately stops vibration compensation and sets the headrest ( 300 is controlled through the motor unit 100 to return to the preset reference position (S151).

Additionally, if the received acceleration is less than the preset threshold, the received collision warning information and TTC are calculated (S150).

At this time, if no object is detected ahead, of course, collision warning information and TTC are not calculated.

Accordingly, if there is a collision warning state and the TTC is less than the return time to the reference position of the headrest, that is, even if a collision is expected before the headrest 300 returns to the reference position, the control unit 200 returns the headrest 300 to the reference position. It will have to be restored to .

In addition, if a collision is detected and the TTC is greater than the return time to the reference position of the headrest, step S151 is performed.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments described above. In other words, a person skilled in the art to which the present invention pertains can make numerous changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications can be made. Equivalents should be considered as falling within the scope of the present invention.

100: motor part
200: control unit
300: Headrest
310: fixing part
320: rotating part
400: sensor unit
1000: Vibration compensation system

Claims (8)

A motor unit that changes the posture of the headrest installed on the seat of the vehicle; and
A control unit that controls the motor unit to compensate for changes in the posture of the headrest due to vibration based on the received posture information of the headrest,
The control unit,
If the received vehicle acceleration exceeds a preset threshold,
Controlling the motor unit to stop compensating for changes in the posture of the headrest due to vibration and return the headrest to a preset reference position.
A headrest vibration compensation system characterized by a.
According to paragraph 1,
The headrest is
It includes a fixed part installed on the seat and a rotating part connected to the fixed part so that it can rotate at a certain angle,
The posture information of the headrest is,
Information on the rotational angular speed of the rotating part with respect to the fixed part
A headrest vibration compensation system characterized by a.
According to paragraph 2,
The control unit
Performing filtering by inputting the received rotational angular velocity information into a high-pass filter with a preset high-frequency band-pass range.
A headrest vibration compensation system characterized by a.
According to paragraph 3,
The control unit
Calculating a rotation angle of the rotating unit based on the rotation angular speed information, and controlling the motor unit to rotate the rotating unit by the rotation angle in the reverse direction based on the calculated rotation angle.
A headrest vibration compensation system characterized by a.
According to clause 4,
The control unit
If the received vehicle acceleration does not exceed a preset threshold,
Based on the received status information of the vehicle, control the motor unit to compensate for the changed rotation angle of the rotating unit or to return the rotating unit to the reference position,
The status information of the vehicle is,
Containing at least one of front object detection information, collision warning information, collision information, brake pressure information, wheel speed information for each wheel, and speed information of the vehicle
A headrest vibration compensation system characterized by a.
According to clause 5,
The control unit,
The motor unit is controlled based on the received vehicle collision warning information (Forward collision warning) and TTC, which is the time to collision,
When vehicle collision warning information is received and the TTC is less than T1, which is the return time to the reference position of the rotating part, controlling the motor unit to return the rotating part to the standard position.
A headrest vibration compensation system characterized by a.
According to clause 6,
The TTC is
Calculated using the formula below:
A headrest vibration compensation system characterized by a.

Here, L(t) is a function related to the distance from the vehicle ahead, Ve(t) is a function related to the speed of the vehicle, and Vp(t) is the speed of the vehicle ahead.
According to clause 5,
The control unit,
Controlling the motor unit to return the rotating unit to the reference position when the brake pressure exceeds a preset threshold based on the received brake pressure information of the vehicle.
A headrest vibration compensation system characterized by a.