KR102301983B1 - Apparatus for operating air-bag of vehicle and control method thereof - Google Patents

Abstract

The present invention discloses an airbag driving apparatus for a vehicle and a method for controlling the same. An airbag driving apparatus for a vehicle according to the present invention includes: a drowsiness state detection unit for sensing the driver's drowsy driving state by photographing the driver's face; an environmental difficulty calculation unit for calculating an environmental difficulty required for a driver's driving operation according to an external environment of the vehicle; a driving skill evaluation unit that evaluates the driving skill based on the driver's driving operation; an avoidance determination unit that determines the driver's will to avoid a collision situation; a collision risk calculation unit that calculates the shortest stopping distance based on the speed of the vehicle and the road surface condition and calculates the collision risk with respect to the obstacle; and a control unit that adjusts the sensor threshold for driving the airbag by estimating the driver's state with respect to the external environment from the collision risk calculated during driving of the vehicle, the driver's drowsy driving state, the driver's will to avoid the collision situation, and the driver's driving skill. It is characterized in that it includes.

Description

Airbag drive device for vehicle and control method thereof

The present invention relates to an airbag driving device for a vehicle and a control method therefor, and more particularly, it calculates the collision risk of a vehicle, and the driver's drowsy driving state and will to avoid a collision situation, according to the driver's driving skill and environmental difficulty. The present invention relates to an airbag driving apparatus for a vehicle that varies a sensor threshold for operating an airbag by determining a driver's condition, and a method for controlling the same.

In general, an airbag device for a vehicle is installed inside a vehicle, and is installed for the purpose of protecting an occupant seated in a driver's seat or a passenger seat from an impact when a collision accident occurs.

The airbag device for a vehicle largely includes a cushion for protecting occupants and an inflator for supplying gas to the cushion, and a dual inflator is also used to enable low and high pressure deployment of the cushion.

In the event of a collision, the airbag device receives a detection signal from an acceleration sensor or a gyro sensor to determine a collision or rollover, and operates an ignition switch according to the determination result to deploy the airbag.

Background art of the present invention is disclosed in Korean Patent Application Laid-Open No. 2014-0013361 (published on February 5, 2014, airbag device for a vehicle).

As described above, the airbag device operates the airbag by determining the collision and rollover. However, since the threshold for determining the collision is the same, when the airbag is activated even in a light collision, there is a secondary risk of giving an impact to the driver due to the expansion of the airbag. In addition, there is a problem that replacement is required due to the deployment of the airbag.

In addition, when the collision risk is set to high, the airbag does not operate even in a collision situation, so that the driver cannot be protected.

The present invention has been devised to improve the above problems, and an object of the present invention according to one aspect is to calculate the collision risk of a vehicle, the driver's drowsy driving state and will to avoid collision situations, and the driver's driving skill and an airbag driving apparatus for a vehicle that varies a sensor threshold for operating an airbag by determining a driver's state according to environmental difficulty, and a method for controlling the same.

According to an aspect of the present invention, there is provided an airbag driving device for a vehicle, comprising: a drowsiness state detecting unit sensing the driver's drowsy driving state by photographing the driver's face; an environmental difficulty calculation unit for calculating an environmental difficulty required for a driver's driving operation according to an external environment of the vehicle; a driving skill evaluation unit that evaluates the driving skill based on the driver's driving operation; an avoidance determination unit that determines the driver's will to avoid a collision situation; a collision risk calculator that calculates the shortest stopping distance based on the speed of the vehicle and the road surface condition and calculates the risk of collision with an obstacle; and a controller that adjusts the sensor threshold for driving the airbag by estimating the driver's state with respect to the external environment from the collision risk calculated while driving the vehicle, the driver's drowsy driving state, the driver's will to avoid the collision situation, and the driver's driving skill. It is characterized in that it includes.

In the present invention, the control unit is characterized by adjusting the sensor threshold when the collision risk is greater than or equal to the reference risk.

In the present invention, the avoidance determination unit is characterized in that when the collision risk is greater than or equal to the reference risk, the determination is made based on the operating state of the steering device or the braking device.

In the present invention, the control unit estimates the driver's state with respect to the external environment as an evaluation score from a table showing a relationship between the environmental difficulty calculated by the environmental difficulty calculating unit and the driving skill amount evaluated by the driving skill evaluation unit. .

In the present invention, the controller adjusts the sensor threshold to the lowest value when the driver is in a drowsy driving state or has no will to avoid a collision situation.

In the present invention, the controller adjusts the sensor threshold to a minimum value when the driver is not in a drowsy driving state and has a will to avoid a collision situation, but the driver state is less than a set value.

In the present invention, when the driver is not in a drowsy driving state and has a will to avoid a collision situation, and the driver's state exceeds a set value, the controller adjusts the sensor threshold according to the collision risk.

According to another aspect of the present invention, there is provided a method for controlling an airbag driving apparatus for a vehicle, the method comprising: calculating, by a controller, a degree of collision risk through a collision risk calculation unit while driving of a vehicle; The control unit receives the collision risk level from the collision risk calculation unit and determines the driver condition for the external environment from the driver's drowsy driving state, the driver's will to avoid a collision situation, and the driver's driving skill when the level of risk is higher than the reference level to drive the airbag. adjusting the sensor threshold; and operating the airbag driving unit by the control unit receiving an amount of impact from the collision detection sensor during a collision and comparing it with the adjusted sensor threshold.

In the step of calculating the collision risk in the present invention, the control unit calculates the shortest stopping distance based on the speed of the vehicle and the road surface condition through the collision risk calculation unit, and calculates the collision risk for the obstacle according to the shortest stopping distance. do it with

In the present invention, when determining the driver's intention to avoid, the controller determines based on the operating state of the steering system or the braking system through the avoidance determination unit when the collision risk is greater than or equal to the reference risk.

In the present invention, when determining the driver's state, the controller determines the driver's state with respect to the external environment as an evaluation score from a table showing the relationship between the environmental difficulty calculated by the environmental difficulty calculating unit and the driving skill evaluated by the driving skill evaluation unit. It is characterized by estimating and judging.

In the step of adjusting the sensor threshold in the present invention, when the driver is in a drowsy driving state or has no will to avoid a collision situation, the controller adjusts the sensor threshold to a minimum value.

In the step of adjusting the sensor threshold in the present invention, when the driver is not in a drowsy driving state and has a will to avoid a collision situation, but the driver's state is less than a set value, the controller adjusts the sensor threshold to the lowest value.

In the present invention, the step of adjusting the sensor threshold is characterized in that, when the driver is not in a drowsy driving state and has a will to avoid a collision situation, and the driver's state exceeds a set value, the controller adjusts the sensor threshold according to the collision risk do it with

An airbag driving apparatus for a vehicle and a control method therefor according to an aspect of the present invention calculates the collision risk of a vehicle, determines the driver's drowsy driving state and will to avoid a collision situation, and the driver's state according to the driver's driving skill and environmental difficulty By changing the sensor threshold for judging and operating the airbag, it is possible to not only deploy the airbag more stably according to the possibility of collision avoidance and damage reduction situation, but also to reduce the secondary risk caused by unnecessary deployment.

1 is a block diagram illustrating an airbag driving apparatus for a vehicle according to an embodiment of the present invention.
2 is a graph illustrating a relationship between a collision risk and a sensor threshold by an airbag driving device for a vehicle according to an embodiment of the present invention.
3 is a flowchart illustrating a method of controlling an airbag driving apparatus for a vehicle according to an embodiment of the present invention.

Hereinafter, an airbag driving apparatus for a vehicle and a control method thereof according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a block diagram showing an airbag driving device for a vehicle according to an embodiment of the present invention, and FIG. 2 is a graph showing the relationship between the collision risk and the sensor threshold by the vehicle airbag driving device according to an embodiment of the present invention. .

As shown in FIG. 1 , the airbag driving device for a vehicle according to an embodiment of the present invention includes a collision detection sensor 10 , a drowsiness state detection unit 20 , an environmental difficulty calculation unit 30 , and a driving skill evaluation unit 40 . ), an avoidance determination unit 50 , a collision risk calculation unit 60 , an airbag driving unit 80 , and a control unit 70 .

The collision detection sensor 10 senses the amount of impact applied to the vehicle when the vehicle collides to deploy the airbag, and provides it to the control unit 70 .

The drowsy state detection unit 20 captures the driver's face, detects the driver's drowsy driving state based on the driver's eye movement, and provides it to the controller 70 .

Here, the driver's drowsy driving state is described as sensing based on the driver's eye movement, but various methods for determining the driver's drowsy driving state may be applied.

The environmental difficulty calculator 30 may calculate the environmental difficulty required for the driver's driving operation according to the external environment of the vehicle at a plurality of levels.

For example, the environmental difficulty may be calculated by directly measuring the road condition, the presence of obstacles, the vehicle trajectory, etc. through a camera, radar, lidar, and ultrasonic sensor, or by receiving it from an external service center.

The driving skill evaluation unit 40 may evaluate the driving skill based on the driver's driving operation in multiple levels.

For example, the driver's driving skill may be calculated at multiple levels by comparing it with sample data based on vehicle information such as vehicle speed, steering angle, and accelerator opening degree, and driver behavior information such as the driver's gaze position.

The avoidance determination unit 50 may determine based on the operating state of the steering device or the braking device in order to avoid the collision situation of the vehicle.

That is, when the steering angle is manipulated or the braking device is operated to avoid a collision in a collision situation, it may be determined that there is a will to avoid the collision situation.

The collision risk calculation unit 60 may calculate the collision risk with respect to the obstacle by calculating the shortest stopping distance based on the speed of the vehicle and the road surface condition of the road.

Here, the shortest stopping distance means the distance required to stop the vehicle most quickly in the driving situation (road condition, road surface condition, brake). can be calculated.

In addition, when calculating the shortest stopping distance, if the weather is rain or snow, the shortest stopping distance may be modified in consideration of the amount of rainfall or snowfall.

In this way, the collision risk calculation unit 60 calculates the shortest stopping distance and then the calculated shortest stopping distance and vehicle speed, the relative speed with the obstacle through the ultrasonic sensor, infrared sensor, lidar, radar, etc., The collision risk can be numerically calculated using the distance to the obstacle and the moving direction of the vehicle.

The airbag driving unit 80 deploys the airbag according to the driving signal of the control unit 70 .

The control unit 70 receives the collision risk calculated during driving of the vehicle, and when the collision risk is greater than or equal to the reference risk, the driver's state for the external environment from the driver's drowsy driving state and the driver's will to avoid the crash situation and the driver's driving skill By estimating and adjusting the sensor threshold for driving the airbag, the airbag driving unit 80 is operated to deploy the airbag by comparing the amount of impact and the adjusted sensor threshold when the vehicle collides.

Here, the control unit 70 evaluates the driver's state with respect to the external environment from the table indicating the relationship between the environmental difficulty calculated by the environmental difficulty calculating unit 30 and the driving skill evaluated by the driving skill evaluation unit 40 as an evaluation score. can be estimated as

Accordingly, when it is determined that the driver is in a drowsy driving state or has no will to avoid a collision situation, or when the driver has a will to avoid but the driver's state is less than a set value, the controller 70 adjusts the sensor threshold to the lowest value to ensure that the airbag is reliably activated. to allow it to develop.

In addition, when the driver is not in a drowsy driving state and has a will to avoid a collision situation, but the driver's state is less than a set value, the control unit 70 adjusts the sensor threshold to the lowest value so that the airbag can be deployed reliably.

On the other hand, when the driver is not in a drowsy driving state and has a will to avoid a collision situation, and the driver's state exceeds the set value, the controller 70 adjusts the sensor threshold according to the collision risk as shown in FIG. It can prevent unnecessary airbag deployment.

As described above, according to the airbag driving apparatus for a vehicle according to an embodiment of the present invention, the collision risk of the vehicle is calculated, the driver's drowsy driving state and the will to avoid a collision situation, and the driver's driving skill and environmental difficulty By varying the sensor threshold for activating the airbag by determining the driver's condition, the airbag can be deployed more stably according to the possibility of collision avoidance and damage mitigation situation, and the secondary risk caused by unnecessary deployment can be reduced.

3 is a flowchart illustrating a method of controlling an airbag driving apparatus for a vehicle according to an embodiment of the present invention.

As shown in FIG. 3 , in the control method of the airbag driving apparatus for a vehicle according to an embodiment of the present invention, first, the control unit 70 calculates the collision risk through the collision risk calculation unit 60 while the vehicle is driving ( S10 ). ).

Here, the collision risk calculation unit 60 may calculate the collision risk for the obstacle by calculating the shortest stopping distance based on the speed of the vehicle and the road surface condition of the road.

Here, the shortest stopping distance means the distance required to stop the vehicle most quickly in the driving situation (road condition, road surface condition, brake). can be calculated.

In addition, when calculating the shortest stopping distance, if the weather is rain or snow, the shortest stopping distance may be modified in consideration of the amount of rainfall or snowfall.

In this way, the collision risk calculation unit 60 calculates the shortest stopping distance and then the calculated shortest stopping distance and vehicle speed, the relative speed with the obstacle through the ultrasonic sensor, infrared sensor, lidar, radar, etc., The collision risk can be numerically calculated using the distance to the obstacle and the moving direction of the vehicle.

After calculating the collision risk through the collision risk calculation unit 60 in step S10, the control unit 70 receives the collision risk calculated from the collision risk calculation unit 60. It may be determined whether the driver is in a drowsy driving state through the unit 20 (S20).

Here, the drowsiness detection unit 20 may detect the driver's drowsy driving state based on the driver's eye movement by photographing the driver's face.

In step S20, it is determined whether the driver is in the drowsy driving state, and when the driver is in the drowsy driving state, the controller 70 adjusts the sensor threshold to the lowest value so that the airbag can be reliably deployed (S70).

On the other hand, if it is determined in step S20 whether the driver is in the drowsy driving state and the driver is not in the drowsy driving state, the control unit 70 may determine whether the driver has the will to avoid the collision situation through the avoidance determination unit 50 ( S30).

Here, the avoidance determination unit 50 may determine based on the operating state of the steering device or the braking device in order to avoid the collision situation of the vehicle.

That is, when the steering angle is manipulated or the braking device is operated to avoid a collision in a collision situation, it may be determined that there is a will to avoid the collision situation.

In step S30, it is determined whether the driver has the will to avoid the collision. If there is no will to avoid, the controller 70 adjusts the sensor threshold to the lowest value so that the airbag can be deployed reliably (S70).

However, in step S30 , it is determined whether the driver has the will to avoid the collision situation and if there is the will, the control unit 70 determines the environmental difficulty calculated by the environmental difficulty calculation unit 30 and the driving skill evaluation unit 40 . The driver's state with respect to the external environment may be estimated as an evaluation score from the table showing the relationship with the evaluated driving skill amount (S40).

Here, the environmental difficulty calculating unit 30 may calculate the environmental difficulty required for the driver's driving operation according to the external environment of the vehicle at a plurality of levels.

For example, the environmental difficulty may be calculated by directly measuring the road condition, the presence of obstacles, the vehicle trajectory, etc. through a camera, radar, lidar, and ultrasonic sensor, or by receiving it from an external service center.

In addition, the driving skill evaluation unit 40 may evaluate the driving skill quantity based on the driver's driving operation in multiple levels.

For example, the driver's driving skill may be calculated at multiple levels by comparing it with sample data based on vehicle information such as vehicle speed, steering angle, and accelerator opening degree, and driver behavior information such as the driver's gaze position.

After estimating the driver's state in step S40, the controller 70 determines whether the driver's state exceeds a set value (S50).

That is, it is determined whether the driver has the ability to avoid the collision situation.

In step S50, when it is determined whether the driver's state exceeds the set value and the driver's state is less than or equal to the set value, the control unit 70 determines that the driver's driving skill cannot avoid the collision situation, and adjusts the sensor threshold to the lowest value to activate the airbag. Make sure it can be deployed (S70).

On the other hand, if it is determined in step S50 whether the driver's state exceeds the set value and the driver's state exceeds the set value, the control unit 70 determines that the driver's driving skill is a situation in which the collision situation can be avoided, and the impact is reduced. As shown in FIG. 2 , the sensor threshold can be adjusted through the relationship with the collision risk (S60).

After adjusting the sensor threshold in steps S60 and S70, the control unit 70 may compare the amount of impact input from the collision detection sensor 10 with the sensor threshold to determine whether the airbag is deployed (S80).

When the amount of impact of the vehicle exceeds the sensor threshold in step S80, the control unit 70 outputs a driving signal to the airbag driving unit 80 so that the airbag can be deployed (S90).

On the other hand, when the amount of impact of the vehicle is less than the sensor threshold in step S80, it is terminated and unnecessary airbag deployment can be prevented.

As described above, according to the control method of the airbag driving device for a vehicle according to the embodiment of the present invention, the collision risk of the vehicle is calculated, the driver's drowsy driving state and the will to avoid the collision situation, the driver's driving skill and the environment By varying the sensor threshold for operating the airbag by judging the driver's condition according to the degree of difficulty, the airbag can be deployed more stably according to the possibility of collision avoidance and damage reduction situation, as well as to reduce the secondary risk caused by unnecessary deployment. do.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely an example, and it is understood that various modifications and equivalent other embodiments are possible by those of ordinary skill in the art. will understand

Therefore, the true technical protection scope of the present invention should be defined by the following claims.

10: collision detection sensor 20: drowsiness state detection unit
30: environmental difficulty calculation unit 40: driving skill evaluation unit
50: avoidance determination unit 60: collision risk calculation unit
70: control unit 80: airbag driving unit

Claims (14)

a drowsiness detection unit sensing the driver's drowsy driving state by photographing the driver's face;
an environmental difficulty calculator configured to calculate an environmental difficulty required for the driver's driving operation according to an external environment of the vehicle;
a driving skill evaluation unit that evaluates the driving skill based on the driving operation of the driver;
an avoidance determination unit that determines the driver's will to avoid a collision situation;
a collision risk calculation unit for calculating a collision risk with respect to an obstacle by calculating the shortest stopping distance based on the speed of the vehicle and the road surface condition; and
For driving the airbag by estimating the driver's state with respect to the external environment from the collision risk calculated during driving of the vehicle, the drowsy driving state of the driver, the driver's will to avoid the crash situation, and the driver's driving skill amount Airbag driving device for a vehicle, characterized in that it comprises a control unit for adjusting the sensor threshold.
The airbag driving apparatus for a vehicle according to claim 1, wherein the control unit adjusts the sensor threshold when the collision risk is greater than or equal to a reference risk.
The airbag driving apparatus for a vehicle according to claim 1, wherein the avoidance determination unit determines based on an operating state of a steering device or a braking device when the collision risk is greater than or equal to a reference risk.
The driver's state with respect to the external environment according to claim 1, wherein the control unit determines the driver's state with respect to the external environment from a table representing a relationship between the environmental difficulty calculated by the environmental difficulty calculating unit and the driving skill amount evaluated by the driving skill evaluation unit. An airbag driving device for a vehicle, characterized in that it is estimated by the evaluation score.
The airbag driving apparatus for a vehicle according to claim 1, wherein the control unit adjusts the sensor threshold to a minimum value when the driver is in a drowsy driving state or has no will to avoid the collision situation.
The airbag driving for a vehicle according to claim 1, wherein the control unit adjusts the sensor threshold to a minimum value when the driver is not in a drowsy driving state and has a will to avoid the crash situation, but the driver's state is less than a set value. Device.
The method of claim 1, wherein the control unit adjusts the sensor threshold according to the collision risk when the driver is not in a drowsy driving state and has a will to avoid the collision situation, and the driver's state exceeds a set value. A vehicle airbag drive system.
calculating, by the control unit, a collision risk level through a collision risk level calculation unit while driving of the vehicle;
When the control unit receives the collision risk level from the collision risk calculation unit and is greater than or equal to the reference level of risk, the driver's drowsy driving state, the driver's will to avoid a collision situation, and the driver's driving skill to determine the driver's condition with respect to the external environment adjusting a sensor threshold for actuating an airbag; and
and operating, by the controller, an amount of impact received from a collision detection sensor during a collision and comparing the amount with the adjusted sensor threshold to operate the airbag driving unit.
The method of claim 8, wherein the calculating of the risk of collision comprises: the control unit calculates the shortest stopping distance based on the speed of the vehicle and the road surface condition of the road through the collision risk calculation unit, and attaches to the obstacle according to the shortest stopping distance A control method of an airbag driving device for a vehicle, characterized in that calculating the collision risk for a vehicle.
The vehicle use according to claim 8, wherein when determining the driver's intention to avoid, the controller determines based on the operating state of the steering system or the braking system through the avoidance determination unit when the collision risk is greater than or equal to a reference risk. A method for controlling an airbag drive system.
The external environment according to claim 8, wherein, when determining the driver's state, the control unit determines the external environment from a table indicating a relationship between the environmental difficulty calculated by the environmental difficulty calculation unit and the driving skill amount evaluated by the driving skill evaluation unit. The control method of an airbag driving apparatus for a vehicle, characterized in that the determination is made by estimating the driver's condition as an evaluation score.
The airbag according to claim 8, wherein, in the step of adjusting the sensor threshold, the controller adjusts the sensor threshold to a minimum value when the driver is in a drowsy driving state or has no will to avoid the collision situation. Control method of driving device.
The method of claim 8, wherein the adjusting of the sensor threshold comprises: when the driver is not in a drowsy driving state and has a will to avoid the collision situation, but the driver's state is less than a set value, the control unit sets the sensor threshold to a minimum value. A control method of an airbag driving device for a vehicle, characterized in that by adjusting the
The method of claim 8, wherein the adjusting of the sensor threshold comprises: when the driver is not in a drowsy driving state and has a will to avoid the crash situation, and the driver's state exceeds a set value, the controller controls the crash risk A control method of an airbag driving device for a vehicle, characterized in that the sensor threshold is adjusted according to the

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