KR20160134389A - Smart seat belt system and method for driving environment change - Google Patents

Smart seat belt system and method for driving environment change Download PDF

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Publication number
KR20160134389A
KR20160134389A KR1020150068378A KR20150068378A KR20160134389A KR 20160134389 A KR20160134389 A KR 20160134389A KR 1020150068378 A KR1020150068378 A KR 1020150068378A KR 20150068378 A KR20150068378 A KR 20150068378A KR 20160134389 A KR20160134389 A KR 20160134389A
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South Korea
Prior art keywords
state
driver
vehicle
seat belt
driving
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KR1020150068378A
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Korean (ko)
Inventor
최진호
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휴먼플러스(주)
최진호
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Priority to KR1020150068378A priority Critical patent/KR20160134389A/en
Publication of KR20160134389A publication Critical patent/KR20160134389A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/48—Control systems, alarms, or interlock systems, for the correct application of the belt or harness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K28/00—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions
    • B60K28/02—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the driver
    • B60K2350/901—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/48—Control systems, alarms, or interlock systems, for the correct application of the belt or harness
    • B60R2022/4808—Sensing means arrangements therefor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Traffic Control Systems (AREA)

Abstract

The present invention relates to a smart seat belt system and an operating environment ventilation method for ventilating a driving environment in a state in which a driver inadvertently operates, for example, in a drowsy driving state during driving of a highway, A determination means for determining whether the driver is in an inadvertent driving state by comparing the information sensed by the state sensing means with predetermined information, and a ventilation means for ventilating the driving state environment of the driver according to the determination result of the determination means So that it is possible to prevent a drowsiness driving accident.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a smart seat belt system and a driving environment ventilation method,

The present invention relates to a smart seat belt system and an operating environment ventilation method for ventilating an operating environment. More particularly, the present invention relates to a smart seat belt system for ventilating a driving environment in a state in which a driver inadvertently operates, for example, And an operating environment ventilation method.

The smart seat belt applied to the present invention refers to a seat belt to which a Smart Concept is actively responding and coping with various conditions of the driver.

Generally, the driver is required to operate the automobile by utilizing the mechanisms and accessories attached to the automobile. That is, the driver manipulates the steering wheel by hand, manipulates the accelerator pedal, the brake pedal, and the clutch pedal with the foot, and utilizes the room mirror and the side mirror as an auxiliary means for securing a rearward view with the eyes.

In Korea, about 210,000 traffic accidents occur each year, resulting in 380,000 casualties and 9 trillion won in traffic accidents. Many people around the world as well as our country are injured and even killed by traffic accidents. Causes include drunk driving, sleepy driving, dangerous driving habits, speeding, and limited vision.

In addition, the automobile is equipped with an airbag, which is a safety device for preventing a passenger from directly hitting the structure of the automobile at the time of an accident to be injured. The airbag is designed to protect the occupant with an appropriate pressure when the distance between the airbag and the occupant is a certain distance.

However, when an actual car accident (collision) occurs, the occupant is pushed forward and the distance between the airbag and the occupant becomes close to each other, so that the occupant is injured by excessive initial pressure of the airbag, It may not be protected by appropriate pressure. Therefore, the automobile is equipped with a seat belt for restraining a passenger sitting on the seat.

That is, the seat belt is a seat belt mounted around the seat of the vehicle to maintain the safety of the occupant. As shown in Fig. 1, the seat belt includes a shoulder belt support portion 10 fixed to the side wall of the vehicle, A waist belt 30 provided on one side of the seat for supporting a waist portion of the user, a buckle 20 provided on the other side of the seat, A tongue plate 50 provided between the shoulder belt 20 and the waist belt 30 and detachably coupled to the buckle 40 and a retractor 60 ).

The seat belt thus configured is intended to prevent a secondary injury from occurring due to an impact force at the time of a collision or the like by fixing the position of the occupant during running to the seat.

In addition, in recent years, according to the environmentally friendly technology of automobiles and the trend of intelligent interlocking, not only the manipulation mechanism of the automobile, the safety nose and the interior of the automobile but also the operation and seating function are provided, To meet more demanding functions. For example, it is possible to provide optimal seating information corresponding to the driver's body in accordance with environmental changes such as traffic information or weather information at the time of driving, Is also disclosed.

For example, in recent years, an active seat belt having a function of providing an adequate restraining force to a seat belt has been applied to a vehicle. That is, when a seat belt is restrained due to a collision, a collision, or a rapid deceleration of a vehicle, tension is generated on the seat belt, and the seat belt is suddenly pulled out, the rotation of the motor is controlled so that the seat belt is no longer pulled out . Thus, it is possible to support the occupant and prevent the occupant from being pushed forward.

The function of the active seat belt device includes a function of predicting a collision in advance to restrain the occupant, a function of restricting the occupant when the vehicle is cornering, a function of warning when the driver is sleepy driving, The ability to remove slack between the belts, and the ability to automatically rewind the seat belt when the buckle is released.

Examples of such techniques are described in documents 1 and 2 below.

For example, in the following Patent Document 1, it is judged whether or not the seat belt has buckled on, and the control unit judges whether or not the driver of the automobile wears the seat belt, judges whether the speed of the vehicle is equal to or higher than the reference speed, When the speed is equal to or higher than the reference speed, the control unit starts the slack elimination operation, the sensing unit senses the driving current of the motor, and the microcomputer determines whether the sensed PWM voltage value is equal to or greater than the threshold voltage. A proportional integral derivative is applied to control the state of the seat belt.

Patent Document 2 discloses an input unit for detecting data for determining whether or not to perform specific actions inside and outside the vehicle and for inputting data according to an operation pattern of the driver, data input from the input unit, A topic analyzing unit for analyzing whether there is a specific behavior and a risk for data received in real time from the input unit using the reference value stored in the database unit, And a risk judgment counterpart for controlling the output of the countermeasure according to the increase or decrease of the risk by using the risk analyzed in the step of detecting the risk.

Patent Document 3 discloses a camera that captures and provides an image of a driver, a navigation controller that provides navigator information on a driving route, and a navigation controller that receives driver images received from the camera and navigator information received from the navigation controller, A driving assist controller for controlling the driver to perform an accident prevention procedure or a drowsiness driving prevention procedure for determining whether the driver is careless and accident risk or whether the driver is driving a sleeping state and concentrating the driver on driving using the determination information, And a function control unit for controlling each function of the vehicle according to the control.

Korean Patent Laid-Open Publication No. 2015-0007733 (published on January 21, 2015) Korean Registered Patent No. 10-1276770 (Registered on June 23, 2013) Korean Patent Publication No. 2010-0028253 (published on Mar. 12, 2010)

However, the above-described conventional technique has a problem in that it is not possible to precisely detect the driving state of the driver, for example, the sleeping driving state of the driver.

Further, in the above-described conventional technology, there is a problem in that it is not clear at the time of judging the drowsy driving that the step of ventilating the driving state to the driver in response to the inadvertent environmental condition of the driver is unclear.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a smart seat belt system and a driving environment ventilation system for ventilating an operating environment when a driver inadvertently performs driving, Method.

Another object of the present invention is to provide a smart seat belt system and an operating environment ventilation method for ventilating an operating environment that can avoid a tedious situation in response to a driver's body change in a long-term operation on a highway or the like.

In order to achieve the above object, a smart seat belt for ventilating an operating environment according to the present invention is a smart seat belt system for ventilating a driving environment in a state in which a driver inadvertently operates a vehicle during driving of a highway, A determination means for determining whether the driver is in an inadvertent driving state by comparing the information sensed by the state sensing means with preset information, and a control means for controlling the driving state of the driver according to the determination result of the determination means. And ventilation means for ventilation.

Further, in the smart seat belt system according to the present invention, the status sensing means may be provided on the side of the driver's body in contact with the body of the driver when the seat belt is fastened to sense a temperature of the driver's body or a heartbeat of the driver And a vibration detection sensor.

Further, in the smart seat belt system according to the present invention, the determination means may include a memory unit for storing information on a body temperature or a heartbeat state during normal operation of the driver, information stored in the memory unit, And a microprocessor for comparing the information on the body temperature or the heartbeat state to determine whether it is an inadvertent operation state.

In the smart seat belt system according to the present invention, the smart seat belt system may further include a transmitter for transmitting the information determined by the determination means to the ventilation means.

Further, in the smart seat belt system according to the present invention, the ventilation means may include a receiving portion for receiving the information transmitted from the transmitting portion, and a vehicle state changing portion for changing the driving state of the vehicle according to the information received by the receiving portion .

In the smart seat belt system according to the present invention, the vehicle state changing section may include a driving change section for changing the driving speed state of the vehicle, a temperature converter for changing the temperature in the vehicle, a listening change section for changing the listening state of the radio in the vehicle, A mounting change portion for changing a mounting state of the seat belt, and a position changing portion for changing a position state of the headrest.

Further, in the smart seat belt system according to the present invention, the mounting change portion includes an oscillating member for adding vibration to the shoulder belt portion in a state in which the seat belt is mounted, or a drawing member for temporarily pulling the shoulder belt.

In order to achieve the above object, in a smart seat belt system according to the present invention, an operating environment ventilation method for ventilating an operating environment in a state where a driver inadvertently drives a vehicle during driving of a highway, (B) detecting a heart rate or a body temperature of the driver with a temperature sensor or a vibration sensor provided on the seat belt when the driver is seated on the vehicle and the seat belt is fastened; (C) storing the heart rate or the body temperature of the driver detected during the driving of the driver as second information in the memory part as the first information in the memory part in the step (b) 1; (d) determining whether an error between the first information and the second information compared in the step (c) is within an error range; And (e) if the driver is determined to be in the inadvertent driving state in the step (d), ventilating the driver's driving condition environment.

In the operating environment ventilation method according to the present invention, the error range in the step (d) is ± 10 times / minute in case of heart rate and ± 0.5 ° C. in case of body temperature.

In the driving environment ventilation method according to the present invention, the step (e) may include changing the operating speed state of the vehicle, changing the temperature state in the vehicle, changing the listening state of the radio in the vehicle, And changing the positional state of the headrest.

As described above, according to the smart seat belt system and the operating environment ventilation method for ventilating the operating environment according to the present invention, it is possible to prevent a traffic accident by ventilating the driving state during long-term operation on the expressway or the like by sensing the body temperature or heart rate of the driver .

Further, according to the smart seat belt system and the operating environment ventilation method for ventilating the operating environment according to the present invention, it is possible to change the state of the seat belt, the temperature inside the vehicle, the state of radio listening, An effect that the operation state can be ventilated can also be obtained.

1 is a view showing the structure of a seat belt applied to the present invention,
2 is a view showing a wearing state of a smart seat belt applied to the present invention,
3 is a block diagram of a smart seat belt system for operating environment ventilation according to the present invention;
FIG. 4 is a block diagram showing the relationship between the determination unit and the transmission unit shown in FIG. 3;
Fig. 5 is a block diagram showing a specific configuration of the ventilation means shown in Fig. 2;
6 is a flowchart for explaining an operation state of a smart seat belt system for ventilation of an operating environment according to the present invention.
7 is a diagram showing an example of the operating state of the smart seat belt system according to the present invention,
8 is a view showing another example of the operating state of the smart seat belt system according to the present invention.

These and other objects and novel features of the present invention will become more apparent from the description of the present specification and the accompanying drawings.

Hereinafter, the configuration of the present invention will be described with reference to the drawings.

3 is a block diagram of a smart seat belt system for ventilation of an operating environment according to the present invention, and Fig. 4 is a block diagram of a smart seat belt system according to a second embodiment of the present invention, FIG. 5 is a block diagram showing a specific configuration of the ventilation means shown in FIG. 2. FIG.

2 to 4, a smart seat belt system for ventilation of an operating environment according to the present invention is a smart seat belt system for ventilating an operating environment in a state where a driver inadvertently drives a vehicle during driving of a highway, A state detecting means 100 provided on the shoulder belt 20 of the seat belt for detecting the state of the driver, a controller for comparing the information sensed by the state sensing means 100 with predetermined information to determine whether the driver is in a careless driving state A ventilation means 300 for ventilating the driver's operating environment according to the determination result of the determination means 200 and a ventilation means 300 for venting the information determined by the determination means 200 to the ventilation means 300 And a transmitting unit 400 for transmitting the data.

The state detecting means 100 includes a temperature sensor for detecting the body temperature of the driver or a vibration sensor for sensing the heartbeat of the driver, the sensor being provided on a side of the driver's body when the driver tightens the seat belt.

When the shoulder belt 20 is worn, the temperature sensor or the vibration sensor may be provided at the position of the driver's heart to improve the accuracy of the measurement. In the above description, the state detecting means 100 is described as being provided on the shoulder belt 20 of the seat belt. However, the present invention is not limited to this, and may be provided in the center portion of the waist belt 30 of the seat belt.

The temperature sensor senses the body temperature of the human body. The normal body temperature of the human body is 36.5 ℃, but when it comes to sleep, the surface temperature of the skin increases by about 1.5 ℃ and decreases by 1 ℃ ~ 1.5 ℃ during sleep. In the present invention, such a temperature sensor is applied to detect the driver's body temperature.

The vibration sensor counts the driver's heart rate. The heart rate is about 60 ~ 80 times / minute for adults, 210 ~ 240 times / minute for exercise, and about 50 ~ 60 times / minute when sleeping. In other words, the heart rate drops about 10 times during sleep. In the present invention, such a vibration sensor is applied to detect a change in heart rate of a driver.

 4, the determination unit 200 includes a memory unit 210 for storing information on a body temperature or a heartbeat state of the driver during normal operation, a memory unit 210 for storing information stored in the memory unit 210, And a microprocessor 220 for comparing information on the detected body temperature or heartbeat state in the course of operation to determine whether it is an inadvertent operation state.

Although the memory unit 210 and the microprocessor 220 are shown separately in FIG. 4, the memory unit 210 may be included in the microprocessor 220.

In addition, the determination means 200 and the status sensing means 100 may be integrally provided as a single module, and the transmitter 400 may be included in the module.

5, the ventilation unit 300 includes a receiving unit 310 for receiving the information transmitted from the transmitting unit 400, a control unit 310 for changing the driving state of the vehicle according to the information received from the receiving unit 310, And a vehicle state change unit 320.

Since the transmitting unit 400 and the receiving unit 310 are provided relatively close to each other in the vehicle, it is preferable to use RFID or Zigbee communication.

The vehicle state changing unit 320 includes a driving change unit 321 for changing the driving speed state of the vehicle, a temperature converter 322 for changing the temperature in the vehicle, a listening change unit 323 for changing the listening state of the radio in the vehicle A mounting change portion 334 for changing the mounting state of the seat belt, and a position changing portion 335 for changing the position state of the headrest.

The operation changing unit 321 may reduce the vehicle speed during driving according to the variation of the body temperature or the heart rate of the driver sensed by the state sensing unit 100. Such an automatic change of the driving speed of the vehicle can be automatically realized by using various advanced electronic devices such as vehicle dynamic control (VDC) and smart cruise control (SCC).

In addition, the temperature converter 322 changes the state of the air conditioner in the vehicle set by the driver. When the driver determines that the driver enters the drowsy driving state according to the detection of the body temperature or the heart rate of the driver, .

Further, in accordance with the above-described judgment, that is, in the driver's drowsy driving judgment, the listening change section 323 increases the output of the radio in the vehicle, and the mounting change section 334 changes, for example, A position changing unit 335 changes the positional state of the headrest by changing the state of attachment of the seat belt by providing an oscillating member for adding vibration to the seat belt 20 or a pulling member for temporarily pulling the shoulder belt. Thereby adding vibration.

Next, a method of ventilating the operating environment using the smart belt system as described above will be described with reference to Figs. 6 to 8. Fig.

FIG. 6 is a flowchart for explaining the operation state of the smart seat belt system for ventilation of the operating environment according to the present invention, FIG. 7 is a view showing an example of the operating state of the smart seat belt system according to the present invention, Is a diagram showing another example of the operating state of the smart seat belt system according to the present invention.

As shown in FIG. 6, the operating environment ventilation method according to the present invention is an operating environment ventilation method for ventilating a driving environment in a state in which a driver inadvertently drives a vehicle while driving on a highway, When the seat belt is fastened (20), the heart rate or the body temperature of the driver is sensed by a temperature sensor or a vibration sensor provided on the seat belt (S30).

In step S30, the initial heart rate or body temperature sensed when the seat belt is fastened is stored in the memory unit 210 as first information (S40).

When the driver runs the vehicle (S50) and, for example, travels for a long time on a highway or the like, the vehicle continuously detects the temperature sensor or the vibration sensor (S60) And compares it with the first information stored in the memory unit 210 in step S40.

That is, the microprocessor 220 compares the first information with the second information, and determines whether the error of the comparison result is within a predetermined error range (S70).

In step S70, the error range is set to ± 10 times / minute in case of heart rate and ± 0.5 degree in case of body temperature.

The setting of the error range of the body temperature is set by the normal body temperature of the human body is 36.5 ° C and the surface temperature of the skin increases by about 1.5 ° C when sleeping and decreases by 1 ° C to 1.5 ° C when sleeping. In addition, the error range of the heart rate is about 60 to 80 times / minute for an adult, and is set to about 50 to 60 times / minute when sleeping.

If it is within the error range in step S70, the process goes to step S60 and the above-described process is repeated.

On the other hand, if the error is out of the range in step S70, the microprocessor 220 determines that the vehicle is in an inattentive driving state and proceeds to change the vehicle state (S80).

If it is determined in step S80 that the vehicle is in the inadvertent driving state, the driving state environment of the driver is ventilated and the vehicle is stopped (S90).

If it is determined in step S90 that the driver is ventilating the operation state and continues the operation, the process proceeds to step S60 and the above-described process is repeated.

When the vehicle is stopped in the step S90, the above-described process is terminated.

The step S80 may be any one of changing the operation speed state of the vehicle, changing the temperature state in the vehicle, changing the listening state of the radio in the vehicle, changing the mounting state of the seat belt, .

That is, as shown in FIG. 7, a vibration member may be provided on a portion of the shoulder belt 20 of the seat belt, so that vibration of the shoulder belt 20 may be applied to awaken the sleeping state of the driver.

In addition, as shown in FIG. 8, the headrest 500 may be provided with a vibration member to vibrate the head portion of the driver so as to wake up the sleeping state of the driver.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

A smart seat belt system for ventilation of the operating environment and an operating environment ventilation method according to the present invention can be used to prevent a vehicle accident from drowsy operation.

100: state detection means
200: Judgment means
300: Ventilation means
400:

Claims (10)

A smart seat belt system for ventilating a driving environment in a state in which a driver inadvertently drives a vehicle during driving of a highway,
State detecting means provided on the seat belt for detecting the state of the driver,
Determining means for comparing the information detected by the state detecting means with predetermined information to determine whether the driver is in an inadvertent driving state,
And ventilation means for ventilating the driver's operating environment according to the determination result of the determination means. The method according to claim 1,
Wherein the state sensing means includes a temperature sensor for sensing the body temperature of the driver or a vibration sensor for sensing the heartbeat of the driver, the sensor being provided on a side of the driver's body when the driver tightens the seat belt, Belt system. 3. The method of claim 2,
The judgment means compares the information stored in the memory with the information on the body temperature or the heartbeat state sensed during the driving process of the driver, And a microprocessor for determining whether the vehicle is in a driving state. The method according to claim 1,
And a transmitter for transmitting the information determined by the determination means to the ventilation means. 5. The method of claim 4,
Wherein the ventilation means includes a reception unit for receiving the information transmitted from the transmission unit, and a vehicle state change unit for changing the driving state of the vehicle according to the information received from the reception unit. 6. The method of claim 5,
The vehicle state changing section includes a driving change section for changing the driving speed state of the vehicle, a temperature converter for changing the temperature in the vehicle, a listening change section for changing the listening state of the radio in the vehicle, And a position changing unit for changing a position state of the headrest. The method according to claim 6,
Wherein the mounting change portion includes an oscillating member for applying a vibration to the shoulder belt portion in a state in which the seat belt is mounted, or a drawing member for temporarily pulling the shoulder belt. There is provided an operating environment ventilation method for ventilating an operating environment in a state in which a driver inadvertently operates a vehicle during driving of a highway,
(a) detecting a driver's heart rate or body temperature by a temperature sensor or a vibration sensor provided on a seat belt when a driver is seated on the vehicle and fastens the seat belt,
(b) storing the heart rate or the body temperature of the initial state sensed at the time of fastening the seat belt in the step (a) in the memory as first information,
(c) comparing the heart rate or body temperature of the driver sensed during the driver's driving with the first information stored in the memory in the step (b) as second information,
(d) determining whether an error between the first information and the second information compared in the step (c) is within an error range, and if the error information is out of an error range,
(e) venting the operating environment of the driver when the inadvertent driving state is determined in the step (d). 9. The method of claim 8,
Wherein the error range in step (d) is ± 10 times / minute for heart rate and ± 0.5 ° C. for body temperature. 9. The method of claim 8,
Wherein the step (e) includes the steps of changing the operating speed state of the vehicle, changing the temperature state in the vehicle, changing the listening state of the radio in the vehicle, changing the mounting state of the seat belt, Wherein the operating environment ventilation method comprises the steps of:
KR1020150068378A 2015-05-15 2015-05-15 Smart seat belt system and method for driving environment change KR20160134389A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180127670A (en) * 2017-05-22 2018-11-30 (주)동아금속 Head support device for vehicle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100028253A (en) 2008-09-04 2010-03-12 재단법인대구경북과학기술원 Method for supporting a driver and apparatus for the same
KR101276770B1 (en) 2011-08-08 2013-06-20 한국과학기술원 Advanced driver assistance system for safety driving using driver adaptive irregular behavior detection
KR20150007733A (en) 2013-07-12 2015-01-21 현대모비스 주식회사 Active seat belt apparatus and vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100028253A (en) 2008-09-04 2010-03-12 재단법인대구경북과학기술원 Method for supporting a driver and apparatus for the same
KR101276770B1 (en) 2011-08-08 2013-06-20 한국과학기술원 Advanced driver assistance system for safety driving using driver adaptive irregular behavior detection
KR20150007733A (en) 2013-07-12 2015-01-21 현대모비스 주식회사 Active seat belt apparatus and vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180127670A (en) * 2017-05-22 2018-11-30 (주)동아금속 Head support device for vehicle

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