KR20190060313A - Ignition control system of curtain airbag in case of rollover of vehicle - Google Patents

Abstract

Provided is a system to control the ignition of a curtain airbag in case of a vehicle rollover. The system includes: a curtain airbag; a roll rate sensor measuring a roll state of a vehicle; an acceleration sensor measuring the acceleration of the vehicle; a rollover type determining part determining a rollover type of the vehicle by receiving the measured information from the roll rate sensor and the acceleration sensor; an ignition timing determining part determining timing for the ignition of the curtain airbag by comparing the measured information values of the sensors with a threshold value necessary for the ignition of the curtain airbag depending on the rollover type determined by the rollover type determining part; and a transverse sliding angle calculating part calculating a transverse sliding angle for the vehicle. The ignition timing determining part includes a threshold value adjustment part adjusting the threshold value by the rollover type in accordance with the oversteering or understeering of the vehicle by receiving the transverse sliding angle information from the transverse sliding angle calculating part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a curtain airbag ignition control system,

The present invention relates to an automobile, and more particularly, to an ignition control system for an airbag and a control method thereof.

Background Art [0002] An automotive airbag is a device that instantaneously protects a vehicle occupant from an impact caused by an air bag inflating around an occupant (for example, a steering wheel or an instrument panel) in the event of a vehicle collision.

BACKGROUND ART A recent airbag is composed of a front airbag deployed from the front of a driver's seat and a front passenger seat toward a passenger's face, and a curtain airbag deployed toward the side of a passenger in response to a side collision.

When a collision occurs in a vehicle, if the collision sensor of the airbag detects a collision, the airbag control unit (ACU) judges whether it is a collision for deploying the airbag, and the ignition device of the inflator . When the ignition device is operated, the explosive gas explodes to generate gas, and the gas is instantaneously injected into the air bag at a high speed so that the air bag expands in such a manner that the air bag expands.

On the other hand, when the vehicle is tilted to the side and overturned, the curtain airbag is deployed to prevent the head of the driver and the passenger from being released to the outside of the vehicle.

Fig. 1 is a front view showing a situation in which a vehicle is rolled over by a curb lock. Fig. 2 is a view showing a movement of a dummy in a vehicle when the rollover situation occurs in Fig. The result is a graph.

Curbstone is a boundary stone that is installed at the boundary of a sidewalk and a roadway so as to distinguish a sidewalk from a sidewalk for the convenience of safety of walking, drainage of roads, guideline guidance, boundaries of roads, and maintenance. Generally, the curb height is 25cm or less, and the curb protects pedestrians and bicycle users from the car and changes the direction of the vehicle that leaves the road.

If the vehicle is wheeled by a sudden steering change as shown in Fig. 1 (hereinafter referred to as a curb hitch), the overturning process may occur.

In order to deploy the curtain airbag when the vehicle is rollover, the roll rate (RX) sensor and the acceleration sensor (low-g Y, low-g Z) located inside the airbag control unit (ACU) . The curtain airbag is deployed by applying an ignition signal when the measured values of the sensors are above a predetermined deployment threshold value.

As shown in FIG. 2, (A) the head of the occupant moves to the outside of the vehicle at the beginning of the curb engagement, (B) in the middle of the curb engagement, the head of the occupant returns to the inside of the vehicle It shows movement.

However, as shown in FIG. 3, the curb engagement signal (i.e., the sensor measured values) exceeds the development threshold value in the middle of the (B) curling engagement. Therefore, it is necessary to (A) develop in the initial state of the curb engagement so as to protect the occupant's head at the time of the initial state of the curb engagement, that is, when the head of the occupant is directed to the outside of the vehicle.

An object of the present invention is to provide an ignition control system for a curtain airbag in a rollover situation in which the deployment timing of a curtain airbag can be adjusted by adjusting a deployment threshold value for each type of rollover of a vehicle.

The present invention relates to a curtain airbag; A roll rate sensor for measuring a roll state of the vehicle; An acceleration sensor for measuring the acceleration of the vehicle; An overturning type determining unit for receiving the measured information from the roll rate sensor and the acceleration sensor and determining the overturning type of the vehicle; An ignition timing determination unit for determining the ignition timing of the curtain airbag by comparing the threshold value required for ignition of the curtain airbag with the measurement information values of the sensors for each rollover type determined by the rollover type determination unit; The ignition timing determination unit receives the information on the lateral slip angle from the lateral slip angle calculation unit and calculates the ignition timing of the vehicle based on the oversteering or understeering of the vehicle. And a threshold value adjuster that adjusts the threshold value of the curtain airbag.

The lateral slip angle calculation unit may be provided inside the vehicle attitude control device (ESC).

The lateral slip angle calculation unit and the ignition timing determination unit can exchange information by CAN communication.

The roll rate sensor, the acceleration sensor, the rollover type determination unit, and the ignition timing determination unit may be provided in an airbag control unit (ACU).

The rollover type determining unit may determine the rollover type using the roll angular speed RX, the lateral acceleration Low-gy, and the vertical acceleration Low-gz.

The rollover type determining unit may determine that the rollover type of the vehicle is at least one of a curb lock, a ramp mode, and a ditch mode.

The deployment thresholds of the airbags may be set differently depending on the type of rollover.

Wherein the threshold value adjusting unit determines that the oversteering is performed if the lateral slip angle is large and adjusts the deployment threshold by a first adjustment value, determines understeering when the lateral slip angle is small, .

The first adjustment value and the second adjustment value may be set differently from each other by calibration using test data for each type of rollover.

The ignition timing determination unit compares the deployment threshold adjusted for each rollover type and the measured roll angular velocity and roll angle signal values and determines the ignition timing of the curtain airbag if the deployment threshold is exceeded.

According to another aspect of the present invention, there is provided a roll rate sensor for measuring a roll state of a vehicle. An acceleration sensor for measuring the acceleration of the vehicle; An overturning type determining unit for receiving the measured information from the roll rate sensor and the acceleration sensor and determining the overturning type of the vehicle; A lateral slip angle calculating unit provided in the vehicle attitude control device (ESC) for calculating a lateral slip angle of the vehicle; And determining a ignition timing of the curtain airbag by comparing a threshold value required for ignition of the curtain airbag according to the rollover type determined by the rollover type determining unit and the measurement information values of the sensors and determining the ignition timing of the curtain airbag from the lateral slip angle calculating unit And an ignition control adjustment determiner for adjusting the threshold value for each of the rollover types according to oversteering or understeering of the vehicle, and provides an ignition control system for a curtain airbag in a vehicle overturn situation.

The rollover type determining unit may determine the rollover type using the roll angular speed RX, the lateral acceleration Low-gy, and the vertical acceleration Low-gz.

The ignition control adjustment determination unit compares the developed threshold value and the measured roll angular velocity and roll angle signal value for each rollover type and determines the ignition timing of the curtain airbag if the rollover threshold value is exceeded.

The ignition control adjustment determination unit may determine that the steering angle is oversteering if the lateral slip angle is large and downwardly adjust the deployment threshold value, determine understeering when the lateral slip angle is small, and adjust the deployment threshold value upward.

The lateral slip angle calculation unit and the ignition control adjustment determination unit can exchange information by CAN communication.

The roll rate sensor, the acceleration sensor, the rollover type determination unit, and the ignition control adjustment determination unit may be provided in an airbag control unit (ACU).

The airbag control unit may further include a rollover determination clearing unit for receiving information from the acceleration sensor and clearing the result of the ignition control adjustment determination unit.

The airbag control unit may further include an ignition clearing unit for clearing the ignition command by the rollover determination clearing unit and the ignition control adjustment determination unit.

According to another aspect of the present invention, there is provided an information processing apparatus including a roll rate sensor for measuring a roll state of a vehicle, an acceleration sensor for measuring an acceleration of the vehicle, and a controller for inputting information measured from the roll rate sensor and the acceleration sensor An airbag control unit (ACU) having an overturning type determining unit for determining a type of overturning of the vehicle; A lateral slip angle calculating unit provided in the vehicle attitude control device (ESC) for calculating a lateral slip angle of the vehicle; And an ignition timing of the curtain airbag by comparing a threshold value required for ignition of the curtain airbag by the rollover type determined by the rollover type determining unit and the measurement information values of the sensors, And an ignition control adjustment determiner for receiving the lateral slip angle information from the lateral slip angle calculator and adjusting the threshold value for each rollover type according to oversteering or understeering of the vehicle. .

Wherein the ignition control adjustment determination unit compares the deployment threshold adjusted for each rollover type with the measured roll angular velocity and roll angle signal value and determines the ignition timing of the curtain airbag if the deployment threshold is exceeded, It is determined that the oversteering is performed and the deployment threshold value is adjusted downward. If the lateral slip angle is small, the understeering is determined and the deployment threshold value can be adjusted upward.

According to the ignition control system of the curtain airbag in the vehicle rollover situation of the present invention, by using the lateral slip angle information of the vehicle posture control device (ESC) to adjust the deployment threshold value for each rollover type of the vehicle, Slower adjustment makes it possible to protect passengers more safely.

Fig. 1 is a front view showing a situation in which the vehicle is rolled over by a curb stuck. Fig.
FIG. 2 is a view of the movement of a dummy in a vehicle when the overturn situation of FIG. 1 occurs.
Fig. 3 is a graph showing the results of the curled test.
4 and 5 are block diagrams of an ignition control system for a curtain airbag in a vehicle rollover situation according to an embodiment of the present invention.
6 shows an example of a formula for measuring the lateral slip angle inside the vehicle posture control apparatus ESC.
7 shows an understeer or oversteer situation of the vehicle.
8 is a configuration diagram of a control system for ignition of a curtain airbag in a rollover situation according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. In the description of the embodiments, it is to be understood that each layer (film), region, pattern or structure may be referred to as being "on" or "under" a substrate, each layer It is to be understood that the terms " on " and " under " include both " directly " or " indirectly " do. In addition, the criteria for the top / bottom or bottom / bottom of each layer are described with reference to the drawings.

In the drawings, dimensions are exaggerated, omitted, or schematically illustrated for convenience and clarity of illustration. Also, the size of each component does not entirely reflect the actual size. The same reference numerals denote the same elements throughout the description of the drawings. Hereinafter, embodiments will be described with reference to the accompanying drawings.

4 and 5 are diagrams showing a configuration of a control system for an airbag inflating curtain airbag according to an embodiment of the present invention. FIG. 6 shows an example of a formula for measuring a side slip angle inside a vehicle posture control apparatus And FIG. 7 shows an understeer or oversteer situation of the vehicle.

4, an ignition control system for a curtain airbag in a vehicle rollover situation according to an embodiment of the present invention includes an airbag control unit 10 mounted on a vehicle, a front impact sensor 21, Front and rear air bags 22 and 23, front air bags 31 and 32, and side air bags 33 and 34.

The airbag control unit 10 may include various constructions therein to determine the time required for ignition of the airbags 31, 32, 33 and 34 and command the deployment of the airbags 31, 32, 33 and 34 .

The frontal collision sensor 21 is located on the bumper of the vehicle and can detect the frontal collision of the vehicle as an acceleration signal and the lateral collision sensors 22 and 23 can be mounted on the side of the vehicle to detect the side collision as an acceleration signal have.

The airbag control unit 10 receives the information of the frontal collision sensor 21 and the side collision sensors 22 and 23 to determine the ignition timing of the front airbags 31 and 32 and the side airbags 33 and 34, Can be determined.

2, in order to control the side air bags 33 and 34 when the vehicle is rollover, a roll rate sensor 100, an acceleration sensor 200, an overturning type judgment unit An ignition timing determination unit 300, and a threshold value adjustment unit 400. The ignition timing determination unit 300 may include an ignition timing control unit 500, an ignition timing determination unit 300,

The roll rate sensor 100 can measure the roll state of the vehicle, that is, the swing motion with respect to the vehicle in the axial direction.

The acceleration sensor 200 can measure the acceleration of the vehicle. Here, the acceleration sensor 200 may include a lateral acceleration sensor 210 and a vertical acceleration sensor 220 to determine the rollover type of the vehicle.

The rollover type determining unit 500 may receive the measured information from the roll rate sensor 100 and the acceleration sensor 200 to determine the rollover type of the vehicle.

The rollover type determination unit 500 receives the roll angular velocity RX, lateral acceleration Low-gy, and vertical acceleration Low-gz of the vehicle from the roll rate sensor 100 and the acceleration sensor 200, Can be used to determine the type of overturning.

For example, the rollover type determining unit 500 may determine the rollover type of the vehicle as at least one of a curb lock, a ramp mode, and a ditch mode. The deployment thresholds of the airbags are set to be different from each other depending on the rollover type, so that the deployment time points of the curtain airbags 33 and 34 may be varied depending on various rollover situations. That is, by determining the type of rollover before determining the ignition timing, it is possible to compare the developed threshold values with the values of the measured sensors.

In this embodiment, a case of curling engagement is exemplified among the rollover types, and the present invention can be applied to the various types of rollover types described above.

The ignition timing determination unit 300 compares the threshold values required for ignition of the curtain airbags 33 and 34 by the rollover type determined by the rollover type determination unit 500 and the measurement information values of the sensors described above, , 34) can be determined.

On the other hand, the vehicle is provided with a vehicle posture control device 20 (ESC) for stabilizing the posture of the vehicle by helping the driver to maintain the intended direction by separately controlling the braking of the wheels, , Electronic Stability Control System) are installed. The vehicle attitude control device 20 is called an electronic vehicle attitude control device, an electronic stability control device, an electronic control running stability device, a vehicle body posture device, or the like.

The vehicle attitude control device 20 ESC judges the vehicle state and the road surface state through a plurality of sensors such as a wheel speed sensor, a brake pressure sensor, a steering angle sensor, a yaw rate sensor, a lateral acceleration sensor, Accordingly, the vehicle posture is stably controlled by performing the braking operation on the turning and inner and outer wheels, respectively. That is, the vehicle attitude control device (ESC) 20 can control the vehicle so as to prevent the vehicle from slipping by intervening promptly when the vehicle runs out of the driver's intention.

To this end, a lateral slip angle calculating unit 600 for calculating a lateral slip angle of the vehicle is included in the vehicle posture control device 20. [ The lateral slip angle calculation unit 600 can exchange information with the ignition timing determination unit 300 provided in the airbag control unit 10 by CAN communication.

As shown in FIG. 6, the lateral slip angle calculating unit 600 can calculate the lateral slip angle of the vehicle using a calculation formula, for example, a Biycle model. Further, since the lateral slip angle can be obtained by using various lateral slip angle calculation information of known techniques, a detailed description thereof will be omitted.

On the other hand, the vehicle attitude control device 20 determines oversteering or understeering of the vehicle through the lateral slip angle calculated by the lateral slip angle calculating unit 600 to determine whether the vehicle is proceeding in a manner inconsistent with the driver's intention.

As shown in Fig. 7, oversteering means that the vehicle in operation is higher in steering angle than the intention of the driver and is bent inward. Understeering is a phenomenon in which the steering angle is lower than the intention of the driver, .

The ignition timing determination unit 300 receives the lateral slip angle information from the lateral slip angle calculation unit 600 and can grasp oversteering or understeering of the vehicle by the lateral slip angle calculation unit 600. [

In the case of oversteering, the possibility of overturning the vehicle is increased because the lateral slip angle is large, and in the case of understering, the lateral slip angle is decreased, so that the possibility of the vehicle overturning is lowered.

Therefore, if the lateral slip angle is large, the threshold value adjuster 400 determines that the oversteer is oversteering, and adjusts the deployment threshold value by the first adjustment value, so that the airbag can be deployed faster than the preset ignition timing.

In addition, the threshold value adjuster 400 may determine the understeering if the lateral slip angle is small, and may extend the airbag more slowly than the preset ignition timing by adjusting the deployment threshold value by the second adjustment value.

Here, the first adjustment value and the second adjustment value may be set differently from each other by calibration using test data for each type of rollover. Accordingly, the threshold adjustment unit 400 can adjust the deployment threshold value for each rollover type determined by the rollover type determination unit 500 described above.

Therefore, the ignition timing determination unit 300 compares the deployment threshold adjusted for each rollover type with the measured roll angular velocity and roll angle signal values, and if it exceeds the deployment threshold, it is determined as the ignition timing of the curtain airbags 33 and 34 Can be commanded to expand.

According to the ignition control system of the curtain airbags 33, 34 in the vehicle rollover situation of the present invention, the deployment threshold value is adjusted for each rollover type of the vehicle by using the lateral slip angle information of the vehicle posture control device 20 (ESC) The deployment time of the curtain airbags 33 and 34 can be adjusted quickly or slowly so that the passenger can be protected more safely.

8 is a configuration diagram of a control system for ignition of a curtain airbag in a rollover situation according to another embodiment of the present invention. In the present embodiment, portions different from the above-described embodiment will mainly be described.

In the present embodiment, unlike the above-described embodiment, the airbag control unit 10 has an ignition control adjustment determiner (Rollover Main Component). The ignition control adjustment determination unit 301 can integrally perform the functions of the ignition timing determination unit 300 and the threshold adjustment unit 400 of the above-described embodiment.

That is, the ignition control adjustment determining unit 301 determines the threshold values necessary for ignition of the curtain airbags 33 and 34 and the measurement information values of the sensors described above according to the rollover type determined by the threshold determination component 500 The ignition timing of the curtain airbags 33 and 34 can be determined. Then, the lateral slip angle information is received from the lateral slip angle calculation unit 600, and the developed threshold value can be adjusted for each rollover type according to oversteering or understeering of the vehicle.

Similarly, the rollover type determining unit 500 can determine the rollover type using the roll angular speed RX, the lateral acceleration Low-gy, and the vertical direction acceleration Low-gz.

If the lateral slip angle is large, the ignition control adjustment determining unit 301 determines that the oversteering is oversteering and downsizes the deployment threshold value. If the lateral skid angle is small, the understeering is determined, and the deployment threshold value is upwardly adjusted.

The ignition control adjustment determining unit 301 compares the development threshold adjusted for each rollover type with the measured roll angular velocity and roll angle signal values and determines the ignition timing of the curtain airbags 33 and 34 have.

The airbag control unit 10 of the present embodiment receives information from the acceleration sensors 200 and checks the results of the ignition control adjustment determiner 301 to determine whether or not a rollover determination slip 700 Component).

Therefore, if both the results of the ignition control adjustment determiner 301 and the overturn determination shaper 700 are identical, the ignition advancement is commanded. If the resultant values do not match, ignition development may not be performed.

The airbag control unit 10 may further include an ignition determination unit 800 and an ignition control unit 800 for ignition by the ignition control adjustment determination unit 301 have. Therefore, the stability against ignition of the airbag can be further increased.

As described above, according to the embodiments of the ignition control system of the curtain airbag in the rollover situation of the present invention, the deployment threshold value is adjusted for each rollover type of the vehicle by using the lateral slip angle information of the vehicle posture control device (ESC) The deployment time of the vehicle can be adjusted quickly or slowly so that the occupant can be protected more safely.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments can be combined and modified by other persons having ordinary skill in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

10: Airbag control unit (ACU) 20: Vehicle attitude control device (ESC)
21: frontal impact sensor 22, 23: side impact sensor
31, 32: front air bag 33, 34: curtain air bag
100: Roll rate sensor 200: Acceleration sensor
210: lateral acceleration sensor 220: vertical acceleration sensor
300: ignition timing determination unit 301: ignition control adjustment determination unit
400: threshold value adjusting unit 500: rollover type determining unit
600: lateral slip angle calculation unit 700: rollover judgment saiping unit
800: ignition shaking part

Claims (20)

Curtain airbags;
A roll rate sensor for measuring a roll state of the vehicle;
An acceleration sensor for measuring the acceleration of the vehicle;
An overturning type determining unit for receiving the measured information from the roll rate sensor and the acceleration sensor and determining the overturning type of the vehicle;
An ignition timing determination unit for determining the ignition timing of the curtain airbag by comparing the threshold value required for ignition of the curtain airbag with the measurement information values of the sensors for each rollover type determined by the rollover type determination unit;
And a lateral slip angle calculation unit for calculating a lateral slip angle of the vehicle,
Wherein the ignition timing determination unit includes a threshold value adjusting unit for adjusting the threshold value for each rollover type according to oversteering or understeering of the vehicle by receiving the information about the lateral slip angle from the lateral slip angle calculating unit, Of the ignition control system. The method according to claim 1,
Wherein the lateral slip angle calculating unit is provided inside the vehicle attitude control device (ESC). 3. The method of claim 2,
Wherein the lateral slip angle calculation unit and the ignition timing determination unit communicate information by CAN communication. The method according to claim 1,
The roll rate sensor, the acceleration sensor, the rollover type determination unit, and the ignition timing determination unit are provided in an airbag control unit (ACU). 5. The method of claim 4,
Wherein the rollover type determining unit determines the rollover type using the roll angular velocity RX, the lateral acceleration Low-g Y, and the vertical acceleration Low-g Z. 6. The method of claim 5,
Wherein the rollover type determining unit determines that the rollover type of the vehicle is at least one of a curb lock, a ramp mode, and a ditch mode. The method according to claim 6,
Wherein the deployment threshold of the airbag is set differently according to the type of rollover. 8. The method of claim 7,
Wherein the threshold value adjusting unit determines that the steering angle is oversteering when the lateral slip angle is large and adjusts the deployment threshold value by a first adjustment value,
Wherein the controller determines the understeer when the lateral slip angle is small and adjusts the deployment threshold by a second adjustment value. 9. The method of claim 8,
Wherein the first adjustment value and the second adjustment value are set differently from each other by calibration using test data for each type of rollover. 10. The method of claim 9,
The ignition timing determination unit compares the deployment threshold adjusted by the rollover type with the measured roll angular velocity and roll angle signal value and determines the ignition timing of the curtain airbag if the deployment threshold is exceeded. Ignition control system. A roll rate sensor for measuring a roll state of the vehicle;
An acceleration sensor for measuring the acceleration of the vehicle;
An overturning type determining unit for receiving the measured information from the roll rate sensor and the acceleration sensor and determining the overturning type of the vehicle;
A lateral slip angle calculating unit provided in the vehicle attitude control device (ESC) for calculating a lateral slip angle of the vehicle; And
Determining an ignition timing of the curtain airbag by comparing a threshold value required for ignition of the curtain airbag according to the rollover type determined by the rollover type determining unit and the measurement information values of the sensors, and determining the lateral slip angle information from the lateral slip angle calculating unit And an ignition control adjustment deciding unit for adjusting the threshold value for each of the rollover types according to oversteering or understeering of the vehicle when the vehicle is overturned. 12. The method of claim 11,
Wherein the rollover type determining unit determines the rollover type using the roll angular velocity RX, the lateral acceleration Low-g Y, and the vertical acceleration Low-g Z. 13. The method of claim 12,
Wherein the ignition control adjustment determination unit compares the development threshold value with the measured roll angular velocity and roll angle signal value for each rollover type and determines the ignition timing of the curtain airbag if the development threshold value is exceeded, Control system. 14. The method of claim 13,
Wherein the ignition control adjustment determination unit determines that the steering angle is oversteering when the lateral slip angle is large and adjusts the deployment threshold value downward,
Wherein the control unit determines the understeer when the lateral slip angle is small and adjusts the deployment threshold value upward. 15. The method of claim 14,
Wherein the lateral slip angle calculation unit and the ignition control adjustment determination unit communicate information by CAN communication. 16. The method according to any one of claims 11 to 15,
Wherein the roll rate sensor, the acceleration sensor, the rollover type determination unit, and the ignition control adjustment determination unit are provided in an airbag control unit (ACU). 17. The method of claim 16,
The airbag control unit includes:
And an abruption determination clearing unit for receiving information from the acceleration sensor and clearing the result of the ignition control adjustment determination unit. 18. The method of claim 17,
The airbag control unit includes:
Further comprising an ignition clearing unit for clearing the ignition command by the rollover determination clearing unit and the ignition control adjustment deciding unit. A roll rate sensor for measuring a roll state of the vehicle, an acceleration sensor for measuring an acceleration of the vehicle, and an acceleration sensor for detecting a rollover type of the vehicle based on the measured information from the roll rate sensor and the acceleration sensor, An airbag control unit (ACU) having an overturning type determination unit for determining an overturning type determination unit
A lateral slip angle calculating unit provided in the vehicle attitude control device (ESC) for calculating a lateral slip angle of the vehicle; And
Determining an ignition timing of the curtain airbag by comparing a threshold value required for ignition of the curtain airbag according to the rollover type determined by the rollover type determination unit and the measurement information values of the sensors provided in the airbag control unit (ACU) And an ignition control adjustment determiner for receiving the lateral slip angle information from the lateral slip angle calculator and adjusting the threshold value for each rollover type according to oversteering or understeering of the vehicle. 20. The method of claim 19,
Wherein the ignition control adjustment determination unit compares the development threshold adjusted by the rollover type with the measured roll angular velocity and roll angle signal value and determines the ignition timing of the curtain airbag if the deployment threshold is exceeded,
If the lateral slip angle is large, it is determined that oversteering is performed and the deployment threshold value is adjusted downward,
And when the lateral slip angle is small, judges under-steering and adjusts the deployment threshold value upwardly.

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