KR20200142288A - Apparatus and method for controlling an airbag for a vehicle - Google Patents

Abstract

A device and a method for controlling an airbag for a vehicle are disclosed. The device for controlling an airbag for a vehicle of the present invention includes: a seating state sensing unit for measuring three-axis acceleration of a seat according to a passenger seating state; a collision detection unit that detects whether a vehicle collides; an ignition unit for deploying a plurality of airbags provided in the vehicle at the time of deployment of airbags of the vehicle; and a control unit that receives input of a three-axis acceleration measurement value from the seating state detection unit to determine the passenger seating state, and determines an airbag deployment scenario corresponding to the determined passenger seating state among a plurality of airbags to control the airbag to be deployed through the ignition unit when it is determined that a collision requiring airbag deployment has occurred by the collision detection unit.

Description

Vehicle airbag control device and method {APPARATUS AND METHOD FOR CONTROLLING AN AIRBAG FOR A VEHICLE}

The present invention relates to an apparatus and method for controlling an airbag for a vehicle, and more particularly, to an apparatus and method for controlling an airbag for a vehicle to operate an airbag by determining the necessity and timing of deploying an appropriate airbag according to sensing a passenger seating state.

In general, an airbag is a device that protects a vehicle passenger from impact when a vehicle crashes, and is a typical passenger protection device along with a seat belt. In addition, airbags and seat belts are not intended to prevent accidents, but are parts to protect passengers in the event of an accident, and are called passive safety devices.

The airbag system consists of a detection system and an airbag module. The detection system consists of a sensor, a battery, and a diagnostic device, and the airbag module consists of an airbag, an impact detection system, and an operating gas expansion device. In the airbag system, when a collision is detected by a sensor, the operating gas device is exploded, and when ignited, the bag is momentarily inflated by the explosive gas. In addition, the gas used in the airbag may be a high-pressure gas generated by rapid combustion of a solid or a gas stored in a high-pressure gas container.

Such an airbag system reduces the amount of impact applied to a driver or passenger in the event of a vehicle accident and guarantees the safety of life, and is installed in most vehicles today and is quite common.

Since the airbag is a system that is directly connected to the life of the driver and passengers, it is not deployed even though the airbag must be deployed in the event of a collision, or the airbag should not be deployed because a collision does not occur, but it is mis-deployed by other shocks to the sensor. If this occurs, it may cause unexpected injury to the driver or passenger. Therefore, the importance of the collision algorithm for the airbag deployment within the required time according to the accurate classification of the collision presence and the collision situation for the airbag deployment, and the situation determination is very great, and the design of a robust algorithm for the collision situation and other situations is required.

On the other hand, in recent years, autonomous driving technology is advancing day by day, and the time for commercialization of autonomous driving is approaching. With the development of autonomous driving technology, there is less intervention in the car, such as the driver's control or braking, and changes inside the car are inevitable due to the expansion of various infotainment systems.

Accordingly, the types of airbags are gradually diversifying. Driver's seat airbag and passenger seat airbag, as well as side airbags that are attached to the side of the seat to prevent side collisions, knee airbags to prevent knee injuries during a collision, and a long deployment from the front of the driver's seat to the rear seats to prevent head injuries. Curtain airbags and seatbelt airbags in which airbags are deployed from seatbelts are being applied to automobiles. In addition, recently, airbags between passengers to prevent secondary collisions between passengers and windshield airbags to protect pedestrians in the event of a collision with pedestrians have also been developed. As such, as various types of airbags are developed, it is more and more required to accurately classify collision situations for airbag deployment and design robust algorithms for collision situations and other situations.

In particular, in autonomous driving, since the seating posture of the passenger does not look only at the front of the driving, the degree of freedom of the seat direction and angle must be variously considered.

However, conventionally, airbags are deployed by using ODS (Occupant Detection System) sensors and SBR (Seat Belt Reminder) sensors, etc. to determine whether passengers are seated or not based on adult/child classification based on weight difference Developed. In other words, there is a problem in that the seat direction cannot be confirmed by the conventional method, and thus it is impossible to deploy the airbag in an appropriate time and in the correct direction for the seating situation with high degree of freedom of autonomous driving.

In addition, in the case of determining the seating situation of passengers only with the active video system, if the seat is located in the opposite direction of driving, the image is covered by the seat and the passenger cannot be monitored, and detecting the passenger with the video may violate privacy protection. Detecting passenger seating by video can cause concern.

Therefore, it is required to develop an airbag system for detecting passenger seating that reflects autonomous driving.

According to an aspect of the present invention, the present invention is invented to improve the above problems, based on an acceleration sensor, a vehicle airbag for operating the airbag by determining the necessity and timing of deploying an appropriate airbag according to a passenger seating state detection. It is an object to provide a control device and method.

An apparatus for controlling an airbag for a vehicle according to an aspect of the present invention includes: a seating state detector configured to measure a 3-axis acceleration of a seat according to a passenger seating state; A collision detection unit that detects whether a vehicle collides; An ignition unit configured to deploy a plurality of airbags provided in the vehicle at a time when the vehicle airbag is deployed; And receiving a 3-axis acceleration measurement value from the seating state sensing unit to determine the passenger seating state, and when determining that a collision that requires airbag deployment has occurred through the collision sensing unit, responds to the determined passenger seating state among the plurality of airbags. And a control unit configured to determine an airbag deployment scenario and control the airbag to be deployed through the ignition unit.

In the present invention, the control unit, according to the X-axis and Y-axis acceleration measurement values input from the seating state detection unit, all seats facing the front, the driver's seat and the passenger seat facing the side, and the driver's seat It is characterized in that the passenger seating state is determined by dividing the passenger seat into a rear seat facing the rear.

In the present invention, when the X-axis acceleration measurement value is less than 0 and the Y-axis acceleration measurement value is less than 0, the control unit determines the passenger seating state as rear seating.

In the present invention, the control unit, when the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, the X-axis acceleration measurement value is less than the threshold value and the Y-axis acceleration measurement value is less than the threshold value. In this case, it is characterized in that the passenger seating state is determined as the side seating.

In the present invention, when the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, the X-axis acceleration measurement value is greater than or equal to a threshold value and the Y-axis acceleration measurement value is greater than or equal to the threshold value. In this case, it is characterized in that the passenger seating state is determined as the front seating.

In the present invention, the control unit determines the passenger seating state by dividing the front seating into a normal seating and a relaxed seating in which the inclination of the driver's seat and the passenger seat is greater than or equal to the reference value according to the measured value of the Z-axis acceleration input from the seating state detection unit. However, when the passenger seating state is a front seating state, if the Z-axis acceleration measurement value is higher than the threshold value, the passenger seating state is determined as normal seating, and if the Z-axis acceleration measurement value is less than the threshold value, the passenger seating state is relaxed. It is characterized by judging by.

In the present invention, the control unit receives a collision detection sensing value from the collision detection unit and calculates a displacement of the collision detection sensing value, and when the collision detection sensing value displacement is greater than or equal to a displacement threshold, the collision detection sensing value is A moving average and a speed are calculated, and when a moving average of the collision detection sensing value is equal to or greater than a moving average threshold value, and the speed of the collision sensing sensing value is equal to or greater than a speed threshold value, it is characterized in that it is determined that airbag deployment is necessary.

The present invention further includes a belt fastening detection unit that detects whether each seat is fastened with a belt, wherein the control unit further includes, when determining that a crash requiring deployment of an airbag has occurred through the crash detection unit, the belt fastening detection unit It is characterized in that it is determined that the airbag deployment is necessary when it is sensed that is fastened.

In the present invention, the plurality of airbags provided in the vehicle includes at least one of a driver airbag, a passenger airbag, a knee airbag, a side airbag, and a curtain airbag.

In the present invention, when determining the passenger seating state as the front seating state, the control unit controls to deploy all of the plurality of airbags provided in the vehicle through the ignition unit, and determines the passenger seating state as a relaxed seating state during front seating. In this case, the driver airbag and the passenger airbag are controlled to be delayed.

In the present invention, when determining that the passenger seating state is the side seating state, the control unit controls the driver airbag and the passenger airbag to be deployed through the ignition unit.

A method for controlling an airbag for a vehicle according to another aspect of the present invention includes the steps of: determining, by a control unit, a seating state of a passenger by receiving a 3-axis acceleration of a seat from a seating state sensing unit; Determining, by the control unit, whether a collision requiring deployment of an airbag has occurred through a collision detection unit; Determining an airbag deployment scenario corresponding to the determined passenger seating state from among a plurality of airbags provided in the vehicle when the control unit determines that a collision requiring airbag deployment has occurred; And controlling the plurality of airbags to be deployed through the ignition unit according to the determined airbag deployment scenario.

In the step of determining the passenger seating state of the present invention, the control unit, according to the X-axis and Y-axis acceleration measurement values input from the seating state detection unit, all seats facing the front, the driver's seat and the passenger seat It characterized in that the passenger seating state is determined by dividing into a side seating facing the side and a rear seating of a driver's seat and a passenger seat facing the rear.

In the step of determining the passenger seating state of the present invention, the controller, when the X-axis acceleration measurement value is less than 0 and the Y-axis acceleration measurement value is less than 0, determines the passenger seating state as rear seating. do.

In the step of determining the passenger seating state of the present invention, the control unit, when the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, the X-axis acceleration measurement value is less than a threshold value and the When the Y-axis acceleration measurement value is less than the threshold value, the passenger seating state is determined as a side seating.

In the step of determining the passenger seating state of the present invention, the control unit, when the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, the X-axis acceleration measurement value is more than a threshold value, and the When the Y-axis acceleration measurement value is greater than or equal to the threshold value, the passenger seating state is determined as front seating.

In the step of determining the passenger seating state of the present invention, the control unit, according to the Z-axis acceleration measurement value input from the seating state sensing unit, allows the front seating to be normally seated, and the inclination of the driver's seat and the passenger seats is greater than or equal to a reference value. The passenger seating state is determined by classifying it into seating, but if the passenger seating state is a front seating state, if the Z-axis acceleration measurement value is greater than or equal to the threshold value, the passenger seating state is determined as normal seating, and the Z-axis acceleration measurement value is critical. If it is less than the value, it is characterized in that the passenger seating state is determined as a relaxed seating.

In the step of determining whether a collision requiring deployment of the airbag of the present invention occurs, the controller receives a collision detection sensing value from the collision detection unit, calculates a displacement of the collision detection sensing value, and displaces the collision detection sensing value. When is greater than or equal to the displacement threshold, the moving average and the speed of the collision detection sensing value are calculated, and the moving average of the collision detection sensing value is greater than or equal to the moving average threshold value, and the speed of the collision detection sensing value is greater than or equal to the speed threshold. It is characterized by determining that it is necessary to deploy an airbag.

The present invention further includes, wherein the control unit detects whether a belt is fastened to each seat through a belt fastening detection unit, wherein the control unit further includes, when it is determined that a crash requiring airbag deployment has occurred through the crash detection unit, the belt When it is sensed that the belt is fastened through the fastening sensor, it is determined that the airbag needs to be deployed.

In the step of controlling the plurality of airbags to be deployed, the control unit controls to deploy at least one of a driver airbag, a passenger airbag, a knee airbag, a side airbag, and a curtain airbag through the ignition unit. .

In the step of controlling the plurality of airbags to be deployed of the present invention, the control unit controls to deploy all of the plurality of airbags provided in the vehicle through the ignition unit when determining the passenger seating state as the front seating state, and When it is determined that the seating state is a relaxed seating state during front seating, the driver airbag and the passenger airbag are controlled to be delayed and deployed.

In the step of controlling the plurality of airbags to be deployed according to the present invention, when determining that the passenger seating state is a side seating state, the controller controls the driver airbag and the passenger airbag to be deployed through the ignition unit.

An apparatus and method for controlling an airbag for a vehicle according to an embodiment of the present invention can improve airbag deployment performance by determining the need, timing and direction of appropriate airbag deployment by determining a passenger seating state of a multi-degree of freedom passenger based on an acceleration sensor. It has the effect of improving product performance and user reliability by accurately determining and detecting the seating state of passengers with only the acceleration sensor to enable accurate response as a passenger seating system suitable for autonomous driving situations.

1 is a block diagram showing a vehicle airbag control apparatus according to an embodiment of the present invention.
2 is a flowchart illustrating a method of controlling an airbag for a vehicle according to an embodiment of the present invention.
3 is a flowchart illustrating a method of determining a passenger seating state in a method for controlling an airbag for a vehicle according to an embodiment of the present invention.
4 is a flowchart illustrating a method of determining whether an airbag needs to be deployed in a method for controlling an airbag for a vehicle according to an embodiment of the present invention.
5 is a view for explaining an airbag deployment scenario of an apparatus and method for controlling an airbag for a vehicle according to an embodiment of the present invention.
6 is an exemplary view illustrating a passenger seating state of an apparatus and method for controlling an airbag for a vehicle according to an embodiment of the present invention.

Hereinafter, an apparatus and method for controlling an airbag for a vehicle according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention and may vary according to the intention or custom of users or operators. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

In addition, the implementation described herein may be implemented in, for example, a method or process, an apparatus, a software program, a data stream or a signal. Although discussed only in the context of a single form of implementation (eg, only as a method), the implementation of the discussed features may also be implemented in other forms (eg, an apparatus or program). The device may be implemented with appropriate hardware, software and firmware. The method may be implemented in an apparatus such as a processor, which generally refers to a processing device including, for example, a computer, microprocessor, integrated circuit or programmable logic device, or the like. Processors also include communication devices such as computers, cell phones, personal digital assistants ("PDAs") and other devices that facilitate communication of information between end-users.

1 is a block diagram showing a vehicle airbag control apparatus according to an embodiment of the present invention, and FIG. 5 is a view for explaining an airbag deployment scenario of a vehicle airbag control apparatus and method according to an embodiment of the present invention, 6 is an exemplary view for explaining a passenger seating state of an apparatus and method for controlling an airbag for a vehicle according to an embodiment of the present invention, and the apparatus for controlling an airbag for a vehicle will be described with reference to this.

As shown in FIG. 1, the vehicle airbag control apparatus according to an embodiment of the present invention includes a sensor unit 100, a control unit 200 and an ignition unit 300.

First, in this embodiment, it is intended to determine an accurate passenger seating situation for appropriate restraint device (airbag) deployment control according to the seat direction and angle during autonomous driving. That is, it is characterized in that the appropriate airbag deployment timing is determined according to the sensing of the passenger seating state.

The sensor unit 100 includes, but is not limited to, a seating detecting unit 110, a seating state detecting unit 120, a belt fastening detecting unit 130, and a collision detecting unit 140, and a vehicle for determining the deployment of an airbag. It may include all of the sensing means.

The seating detection unit 110 detects whether a passenger is seated, and may be provided on each seat in the vehicle. In addition, in this embodiment, since it is a known technology that the airbag is deployed only in the state in which the passenger is seated, when the seating detection unit 110 detects the seating of the passenger, the control unit 200 deploys the airbag in detail. I never do that. However, in this embodiment, even if the seat detection unit 110 determines that the passenger is seated, when the belt fastening detection unit 130 to be described later does not detect the belt fastening, it is determined that the object is raised and the airbag is deployed. Can be avoided.

The seating state detection unit 120 measures the three-axis acceleration of the seat according to the passenger seating state, and may measure the X-axis, Y-axis, and Z-axis accelerations of each seat and provide it to the control unit 200. That is, the seating state detection unit 120 may include an acceleration sensor. In this case, the 3-axis acceleration measurement signal measured by the seating state detection unit 120 may be provided to the control unit 200 after low-pass filter processing.

The belt fastening detection unit 130 detects whether each seat is fastened with a belt, and may be provided in each seat. In other words, the belt fastening detection unit 130 may detect whether each seat is fastened with a belt and provide it to the control unit 200, and the control unit 200 may provide the belt fastening of each seat of the belt fastening detection unit 130. You can finally decide whether to deploy the airbag.

The collision detection unit 140 detects whether a vehicle collides, and may measure an X-axis acceleration of the vehicle. That is, the collision detection unit 140 may include an acceleration sensor. In addition, the acceleration measurement signal measured by the collision detection unit 140 may be provided to the controller 200 after low-pass filter processing. The control unit 200 may receive a result of detecting whether a vehicle has a collision from the collision detection unit 140 and determine whether the airbag needs to be deployed. That is, the control unit 200, not the degree to which the car is broken, may determine the degree of collision through the acceleration measurement value of the collision detection unit 140 to determine whether the airbag is deployed.

The ignition unit 300 deploys a plurality of airbags provided in the vehicle at the time of deployment of the airbag of the vehicle, and may ignite a corresponding airbag among the plurality of airbags according to a control signal from the controller 200 to deploy.

At this time, in the present embodiment, the plurality of airbags may include at least one of a driver airbag, a passenger airbag, a knee airbag, a side airbag, and a curtain airbag, but is not limited thereto. At this time, the driver airbag is installed in front of the driver, the passenger airbag is installed in front of the passenger seat, the knee airbag is installed at the passenger's knee position, the side airbag is installed on the side of the vehicle, and the curtain airbag extends from the front of the driver's seat to the rear seat. It can be installed to be possible, and each installation location is not limited.

That is, the ignition unit 300 is a driver airbag (DAB) ignition unit 310, a passenger airbag (PAB) ignition unit 320, a knee airbag (KAB) ignition unit 330, A side airbag (SAB) ignition unit 340 and a curtain airbag (CAB) ignition unit 350 may be included.

The controller 200 controls the deployment of the airbag, and includes a seating state determination unit 210 and an airbag deployment determination unit 220.

The seating state determination unit 210 receives a 3-axis acceleration measurement value from the seating state detection unit 110 to determine the passenger seating state, and the airbag deployment determination unit 220 allows the airbag deployment through the collision detection unit 140 When it is determined that a necessary collision has occurred, an airbag deployment scenario corresponding to the determined passenger seating state among a plurality of airbags may be determined and the airbag may be deployed through the ignition unit 300.

More specifically, referring to FIG. 6, the seating state determination unit 210 includes all of the X-axis and Y-axis acceleration measurements input from the seating state detection unit 110 as shown in FIG. 6(a). Passengers are divided into a front seat with a seat facing the front, a side seat with the driver's seat and passenger seats facing the side shown in FIG. 6(b), and a rear seat with the driver's seat and passenger seats facing the rear side shown in FIG. 6(c). You can judge the seating status.

That is, in this embodiment, it is possible to determine the seating states of the driver's seat (passenger 1) and the passenger seat (passenger 2).

In this case, the seating state determination unit 210 may calculate the three-axis velocity and displacement after low-pass filtering the three-axis acceleration measurement signal measured by the seating state sensing unit 120. That is, the seating state determination unit 210 may calculate a velocity by integrating the 3-axis acceleration measurement value from the seating state sensing unit 120, and calculate a displacement by double-integrating.

The seating state determining unit 210 may determine the seating state, that is, the degree of freedom state according to the displacement value calculated above.

That is, when the X-axis acceleration measurement value is less than 0 and the Y-axis acceleration measurement value is less than 0, the seating state determination unit 210 may determine the passenger seating state as a rear seating (face-to-face mode). In other words, the seating state determination unit 210 has a negative value (-1) for the X-axis acceleration measurement value of the driver's seat and the passenger seat, and the negative value (-1) for the Y-axis acceleration measurement, By judging that displacement has occurred, the passenger seating state can be determined as the rear seating (face-to-face mode).

And the seating state determination unit 210, when the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, the X-axis acceleration measurement value is less than the threshold value and the Y-axis acceleration measurement value is less than the threshold value, the passenger The seating state can be determined as a side seating (swivel mode). In other words, the seating state determination unit 210 determines that the X-axis acceleration measurement value of the driver's seat and the passenger seat is 0, the Y-axis acceleration measurement value is 0, and no displacement in the front or rear direction has occurred, and the passenger seating state Can be determined as a side seating (swivel mode).

In addition, when the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, the seating state determination unit 210 is, if the X-axis acceleration measurement value is more than the threshold value and the Y-axis acceleration measurement value is more than the threshold value, The passenger seating state can be determined as front seating. In other words, the seating state determination unit 210 has a positive value (1) for the X-axis acceleration measurement value of the driver's seat and the passenger seat, and a positive value (1) for the Y-axis acceleration measurement, and the displacement in the front direction. By judging that it has occurred, the passenger seating state can be judged as a front seating.

On the other hand, in the present embodiment, the seating state determination unit 210, according to the Z-axis acceleration measured value input from the seating state detection unit 110, the front seating is normal seating (normal mode), and the inclination of the driver's seat and the passenger seat It is possible to determine the passenger seating status by dividing into a relaxed seating (relaxation mode) that is greater than or equal to the standard value.

That is, when the passenger seating state is a front seating state, the seating state determination unit 210 determines the passenger seating state as a normal seating state when the Z-axis acceleration measurement value is greater than or equal to the threshold value (+0.5), and the Z-axis acceleration measurement value is If it is less than the threshold (+0.5), the passenger seating state can be determined as a relaxed seating. At this time, in the relaxation seating, the seat may be in a state in which the seat is inclined at least 35° relative to the Z-axis, and the passenger is lying down.

In addition, the airbag deployment determination unit 220 receives a collision detection sensing value from the collision detection unit 140 and calculates a displacement of the collision detection sensing value, and when the collision detection sensing value displacement is greater than or equal to a displacement threshold value, the collision detection sensing value The moving average and speed of are calculated, and when the moving average of the collision detection sensing value is greater than the moving average threshold value, and the speed of the collision detection sensing value is greater than the speed threshold value, it may be determined that airbag deployment is necessary.

On the other hand, in the present embodiment, a sapping sensor (not shown) may be included to prevent the collision detection unit 140 from erroneous detection. That is, the shaping sensor (not shown) may mean an auxiliary sensor that assists the result of determining whether the airbag is deployed from the collision detection unit 140, and a collision capable of determining whether the airbag is deployed according to a separate shaping logic. It may be sensed and provided to the control unit 200.

In this case, the airbag deployment determination unit 220 may calculate the X-axis velocity and displacement after low-pass filtering the X-axis acceleration measurement signal measured by the collision detection unit 140. That is, the airbag deployment determination unit 220 may calculate the velocity by integrating the X-axis acceleration measurement value from the collision detection unit 140, and calculate the displacement by double-integrating. The airbag deployment determining unit 220 may determine whether the airbag is deployed due to a collision according to the displacement value calculated above.

On the other hand, in this embodiment, when the airbag deployment determination unit 220 determines that a collision requiring airbag deployment has occurred through the collision detection unit 140, the airbag is detected that the belt is fastened through the belt fastening detection unit 130. It can be determined that deployment is necessary. That is, when the belt is not fastened, the three-axis acceleration measurement value is measured through the seating state detection unit 120, but the airbag deployment determination unit 220 determines that the belt is not fastened, and that an object is loaded on the seat. It can be classified by development conditions.

However, the present invention is not limited thereto, and even when the belt is not fastened through a separate airbag deployment determination condition, it may be determined as an airbag deployment necessary situation.

Looking at the airbag deployment scenario with reference to FIG. 5, when determining that the passenger seating state is the front seating state, the controller 200 may control to deploy all of the plurality of airbags provided in the vehicle through the ignition unit 300. . That is, the control unit 200 is in a front seated state, a driver airbag (DAB) ignition unit 310, a passenger airbag (PAB) ignition unit 320, a knee airbag (KAB) ignition unit 330, the side airbag (SAB) ignition unit 340 and the curtain airbag (CAB) ignition unit 350 are both operated to control all airbags to be deployed.

However, when the control unit 200 determines that the passenger seating state is a relaxed seating state among the front seating, the driver airbag and the passenger airbag may be controlled to be delayed. That is, when it is determined that the control unit 200 is in the relaxed seating state, the passenger is lying down and sets the time of deployment of the airbag later than before, and the driver airbag (DAB) ignition unit 310 and the passenger airbag (Passenger Airbag) PAB) The ignition unit 320 may be controlled to perform a delay operation.

In addition, when determining that the passenger seating state is the side seating state, the controller 200 may control the driver airbag and the passenger airbag to be deployed through the ignition unit 300. That is, when the passengers in the driver's seat and the passenger seat face the side, the controller 200 allows only the driver airbag (DAB) ignition unit 310 and the passenger airbag (PAB) ignition unit 320 to be operated. In addition, the driver airbag and the passenger airbag can serve as side airbags based on the passengers facing the side.

In addition, when determining that the passenger seating state is the rear seating state, the controller 200 may control the side airbag and the curtain airbag to be deployed through the ignition unit 300. In this embodiment, when the control unit 200 determines the passenger seating state as the rear seating state, it may be determined that the airbag is not deployed, which means that the airbags on the driver and passenger seat side are not deployed, and the air only located on the side or rear of the vehicle is deployed. It means to be able to. That is, when the control unit 200 is in the rear seating state, only the side airbag (SAB) ignition unit 340 and the curtain airbag (CAB) ignition unit may be controlled to operate.

That is, in this embodiment, the displacement amount of the X-axis, Y-axis and Z-axis is calculated based on the acceleration measurement value of the seating state detection unit 120, and the passenger's degree of freedom (position and direction) is determined using the corresponding value. By making it possible to control whether or not to deploy the airbag after and when to deploy it, it is possible to deploy more accurate and robust airbags against a collision situation.

2 is a flowchart illustrating a method for controlling an airbag for a vehicle according to an embodiment of the present invention, and FIG. 3 is a flowchart illustrating a method for determining a passenger seating state in the method for controlling an airbag for a vehicle according to an embodiment of the present invention, 4 is a flowchart illustrating a method of determining whether an airbag needs to be deployed in a method for controlling an airbag for a vehicle according to an exemplary embodiment of the present invention. A method for controlling an airbag for a vehicle will be described with reference to this.

As shown in FIG. 2, in the method for controlling an airbag for a vehicle according to an embodiment of the present invention, first, the control unit 200 receives the 3-axis acceleration of the seat from the seating state detection unit 110 (S100), and The state is determined (S200).

In this case, the seating state detection unit 120 measures the three-axis acceleration of the seat according to the passenger seating state, and may measure the X-axis, Y-axis, and Z-axis acceleration of each seat and provide it to the control unit 200. That is, the seating state detection unit 120 may include an acceleration sensor. In this case, the 3-axis acceleration measurement signal measured by the seating state detection unit 120 may be provided to the control unit 200 after low-pass filter processing.

The controller 200 may calculate the three-axis velocity and displacement after low-pass filtering the three-axis acceleration measurement signal measured by the seating state detection unit 120. That is, the control unit 200 may calculate a velocity by integrating a 3-axis acceleration measurement value from the seating state detection unit 120, and calculate a displacement by double-integrating. In addition, the controller 200 may determine a seating state, that is, a state of freedom, according to the displacement value calculated above.

Next, the control unit 200 receives a collision detection sensing value from the collision detection unit 140 and receives a belt tightening detection sensing value from the belt fastening detection unit 130 (S300), and whether a collision requiring airbag deployment occurs. Can be determined (S400).

In this case, the collision detection unit 140 detects whether the vehicle collides, and may measure an X-axis acceleration of the vehicle. That is, the collision detection unit 140 may include an acceleration sensor. In addition, the acceleration measurement signal measured by the collision detection unit 140 may be provided to the controller 200 after low-pass filter processing. The control unit 200 may receive a result of detecting whether a vehicle has a collision from the collision detection unit 140 and determine whether the airbag needs to be deployed.

The belt fastening detection unit 130 detects whether each seat is fastened with a belt, and may be provided in each seat. In other words, the belt fastening detection unit 130 may detect whether each seat is fastened with a belt and provide it to the control unit 200, and the control unit 200 may provide the belt fastening of each seat of the belt fastening detection unit 130. You can finally decide whether to deploy the airbag.

In step S400, when it is determined that a collision requiring airbag deployment has occurred, the controller 200 determines an airbag deployment scenario corresponding to the determined passenger seating state among a plurality of airbags provided in the vehicle (S500).

At this time, referring to FIG. 5, looking at the airbag deployment scenario, the controller 200 controls to deploy all of the plurality of airbags provided in the vehicle through the ignition unit 300 when determining the passenger seating state as the front seating state. I can. That is, the control unit 200 is in a front seated state, a driver airbag (DAB) ignition unit 310, a passenger airbag (PAB) ignition unit 320, a knee airbag (KAB) ignition unit 330, the side airbag (SAB) ignition unit 340 and the curtain airbag (CAB) ignition unit 350 are both operated to control all airbags to be deployed.

However, when the control unit 200 determines that the passenger seating state is a relaxed seating state among the front seating, the driver airbag and the passenger airbag may be controlled to be delayed. That is, when it is determined that the control unit 200 is in the relaxed seating state, the passenger is lying down and sets the time of deployment of the airbag later than before, and the driver airbag (DAB) ignition unit 310 and the passenger airbag (Passenger Airbag) PAB) The ignition unit 320 may be controlled to perform a delay operation.

In addition, when determining that the passenger seating state is the side seating state, the controller 200 may control the driver airbag and the passenger airbag to be deployed through the ignition unit 300. That is, when the passengers in the driver's seat and the passenger seat face the side, the controller 200 allows only the driver airbag (DAB) ignition unit 310 and the passenger airbag (PAB) ignition unit 320 to be operated. In addition, the driver airbag and the passenger airbag can serve as side airbags based on the passengers facing the side.

In addition, when determining that the passenger seating state is the rear seating state, the controller 200 may control the side airbag and the curtain airbag to be deployed through the ignition unit 300. In this embodiment, when the control unit 200 determines the passenger seating state as the rear seating state, it may be determined that the airbag is not deployed, which means that the airbags on the driver and passenger seat side are not deployed, and the air only located on the side or rear of the vehicle is deployed. It means to be able to. That is, when the control unit 200 is in the rear seating state, only the side airbag (SAB) ignition unit 340 and the curtain airbag (CAB) ignition unit may be controlled to operate.

On the other hand, if it is determined that airbag deployment is unnecessary in step S400, it may be terminated.

Next, the controller 200 may control at least one of the plurality of airbags to be deployed through the ignition unit 300 according to the airbag deployment scenario determined in step S500 (S600).

At this time, the ignition unit 300 deploys a plurality of airbags provided in the vehicle at the time of deployment of the airbags of the vehicle, and can ignite a corresponding airbag among the plurality of airbags according to a control signal from the controller 200. have.

In this embodiment, the plurality of airbags may include at least one of a driver airbag, a passenger airbag, a knee airbag, a side airbag, and a curtain airbag, but is not limited thereto.

Meanwhile, referring to FIG. 3, looking at a method for determining a passenger seating state according to an embodiment of the present invention in more detail, the control unit 200 includes three axes (X-axis, Y-axis) input from the seating state detection unit 110. And Z-axis) check the seating state detection sensing value (S210).

That is, the control unit 200 may calculate the three-axis velocity and displacement after low-pass filtering the three-axis acceleration measurement signal measured by the seating state detection unit 120.

And the controller 200 checks whether the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more (S220), and whether the X-axis acceleration measurement value is more than the threshold value and the Y-axis acceleration measurement value is more than the threshold value. It can be confirmed (S230).

In step S220, when the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, and in step S230, when the X-axis acceleration measurement value is more than the threshold value and the Y-axis acceleration measurement value is more than the threshold value, the controller 200 May determine the passenger seating state as a front seating (S240).

In other words, the control unit 200 determines that the X-axis acceleration measurement value of the driver's seat and passenger seat is a positive value (1), and the Y-axis acceleration measurement value is a positive value (1), and that displacement in the front direction has occurred. Thus, the passenger seating state can be determined as front seating.

On the other hand, in this embodiment, the controller 200 checks whether the Z-axis acceleration measurement value input from the seating state detection unit 110 is greater than or equal to the threshold value (S250), and when the Z-axis acceleration measurement value is greater than or equal to the threshold value, the front During the seating, it may be determined as a normal seating (normal mode) (S260).

On the other hand, when the Z-axis acceleration measurement value is less than the threshold value, the controller 200 may determine that the front seating is a relaxed seating (relax mode) (S270).

That is, the relaxation seating refers to a passenger seating state in which the inclination of the driver's seat and the passenger seat is greater than or equal to the reference value. In other words, when the passenger seating state is the front seating state, if the Z-axis acceleration measurement value is greater than or equal to the threshold value (+0.5), the control unit 200 determines the passenger seating state as a normal seating state, and the Z-axis acceleration measurement value is the threshold value. If it is less than (+0.5), the passenger seating condition can be judged as a relaxed seating. At this time, in the relaxation seating, the seat may be in a state in which the seat is inclined at least 35° relative to the Z-axis, and the passenger is lying down.

On the other hand, in step S220, when the X-axis acceleration measurement value is less than 0 and the Y-axis acceleration measurement value is less than 0, the controller 200 may determine the passenger seating state as a rear seating (face-to-face mode) (S280).

In other words, the controller 200 has a negative value (-1) for the X-axis acceleration measurement value of the driver's seat and the passenger seat, and a negative value (-1) for the Y-axis acceleration measurement, resulting in displacement in the rear direction. It is determined that the seating state of the passengers can be determined as the rear seating (face-to-face mode).

And in step S220, when the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, and in step S230, the X-axis acceleration measurement value is less than the threshold value and the Y-axis acceleration measurement value is less than the threshold value, the controller 200 ) May determine the passenger seating state as a side seating (swivel mode) (S290).

In other words, the control unit 200 determines that the X-axis acceleration measurement value of the driver's seat and the passenger seat is 0, the Y-axis acceleration measurement value is 0, and no displacement in the front or rear direction has occurred, so that the passenger seating state is side-sitting. It can be judged as (swivel mode).

Meanwhile, referring to FIG. 4, a method of determining the need to deploy an airbag according to an embodiment of the present invention will be described. The control unit 200 receives a collision detection sensing value from the collision detection unit 140 and displaces the collision detection sensing value. Is calculated (S410).

In this case, the controller 200 may calculate the X-axis velocity and displacement after low-pass filtering the X-axis acceleration measurement signal measured by the collision detection unit 140. That is, the control unit 200 may calculate the velocity by integrating the measurement value of the X-axis acceleration from the collision detection unit 140, and calculate the displacement by double-integrating.

Then, the controller 200 checks whether the displacement of the collision detection sensing value is greater than or equal to the displacement threshold (S420), and when the displacement value of the collision detection sensing value is greater than or equal to the displacement threshold, calculates a moving average and speed of the collision detection sensing value. (S430).

Then, the control unit 200 checks whether the moving average of the collision detection sensing value is greater than or equal to the moving average threshold value, and the speed of the collision detection sensing value is greater than or equal to the speed threshold value (S440), and the moving average of the collision detection sensing value is moved. If the average threshold is higher and the speed of the collision detection sensing value is higher than the speed threshold, it is checked whether the belt is fastened (S450).

When the belt fastening state is confirmed in step S450, the controller 200 may determine that the airbag deployment is necessary (S460).

On the other hand, if the collision detection sensing value displacement in step 420 is less than the displacement threshold value, or the collision detection sensing value moving average in step S440 is less than the moving average threshold value and the collision detection sensing value speed is less than the speed threshold value, or in step S450 When it is confirmed that the is not fastened, the control unit 200 may determine that deployment of the airbag is unnecessary (S470).

That is, as a result of the collision detection, the control unit 200 can classify not only the case that a collision has occurred to the extent that the airbag deployment is unnecessary, but also the case that the belt is not fastened or that an object is loaded on the seat, and is classified as an airbag not deployed condition .

As described above, the apparatus and method for controlling an airbag for a vehicle according to an embodiment of the present invention determine the need, time and direction of appropriate airbag deployment by determining a passenger seating state of a multi-degree of freedom passenger based on an acceleration sensor. It has the effect of improving deployment performance, and by accurately determining and detecting the seating state of passengers with only the acceleration sensor, it enables accurate response as a passenger seating system suitable for autonomous driving situations, thereby improving product performance and user reliability. have.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only illustrative, and those of ordinary skill in the field to which the technology pertains, various modifications and other equivalent embodiments are possible. I will understand.

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

100: sensor unit
110: seating detection unit
120: seating state detection unit
130: belt fastening detection unit
140: collision detection unit
200: control unit
210: seating state determination unit
220: airbag deployment determination unit
300: ignition unit
310: Driver Airbag (DAB)
320: Passenger Airbag (PAB)
330: Knee Airbag (KAB)
340: Side Airbag (SAB)
350: Curtain Airbag (CAB)

Claims (22)

A seating state detection unit that measures the three-axis acceleration of the seat according to the passenger seating state;
A collision detection unit that detects whether a vehicle collides;
An ignition unit configured to deploy a plurality of airbags provided in the vehicle at a time when the vehicle airbag is deployed; And
When the passenger seating state is determined by receiving a 3-axis acceleration measurement value from the seating state sensing unit, and when it is determined that a collision requiring airbag deployment has occurred through the collision sensing unit, corresponding to the determined passenger seating state among the plurality of airbags And a control unit for determining an airbag deployment scenario and controlling the airbag to be deployed through the ignition unit.
The method of claim 1,
The control unit,
Front seating with all seats facing the front, side seating with the driver's and passenger seats facing the side, and rear seating with the driver's and passenger seats facing the rear, according to the X-axis and Y-axis acceleration measurements input from the seating state detection unit. Airbag control device for a vehicle, characterized in that to determine the passenger seating state by dividing into.
The method of claim 2,
The control unit,
When the X-axis acceleration measured value is less than 0 and the Y-axis acceleration measured value is less than 0, the passenger seating state is determined as rear seating.
The method of claim 2,
The control unit,
When the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, the X-axis acceleration measurement value is less than the threshold value and the Y-axis acceleration measurement value is less than the threshold value, the passenger seating state is side-seated. Vehicle airbag control device, characterized in that determined as.
The method of claim 2,
The control unit,
When the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, the X-axis acceleration measurement value is more than the threshold value and the Y-axis acceleration measurement value is more than the threshold value, the passenger seating state is front-seat Vehicle airbag control device, characterized in that determined as.
The method of claim 5,
The control unit,
According to the Z-axis acceleration measurement value input from the seating state sensing unit, the front seating is divided into a normal seating and a relaxed seating in which the inclination of the driver's seat and the passenger seat is more than the standard value to determine the passenger seating state, but the passenger seating state is the front seating In the case of a state, if the Z-axis acceleration measurement value is more than a threshold value, the passenger seating state is determined as a normal seating state, and when the Z-axis acceleration measurement value is less than the threshold value, the passenger seating state is determined as a relaxed seating state. Airbag control device.
The method of claim 1,
The control unit,
A collision detection sensing value is input from the collision detection unit to calculate a displacement of the collision detection sensing value, and when the collision detection sensing value displacement is greater than or equal to a displacement threshold value, a moving average and a speed of the collision detection sensing value are calculated, When the moving average of the collision detection sensing value is equal to or greater than a moving average threshold value, and the speed of the collision sensing sensing value is equal to or greater than the speed threshold value, it is determined that the airbag deployment is necessary.
The method of claim 1,
Further comprising a; belt fastening detection unit for detecting whether the belt fastening of each seat,
The control unit,
When it is determined that a collision requiring airbag deployment has occurred through the collision detection unit, when it is sensed that the belt is tightened through the belt fastening detection unit, it is determined that the airbag deployment is necessary.
The method of claim 1,
A plurality of airbags provided in the vehicle,
A vehicle airbag control device comprising at least one of a driver airbag, a passenger airbag, a knee airbag, a side airbag, and a curtain airbag.
The method of claim 9,
The control unit,
When the passenger seating state is determined as the front seating state, the ignition unit controls to deploy all of the plurality of airbags provided in the vehicle, and when the passenger seating state is determined to be a relaxed seating state among front seating, the driver airbag and passenger airbag are Airbag control device for a vehicle, characterized in that the control to be delayed deployment.
The method of claim 9,
The control unit,
When it is determined that the passenger seating state is the side seating state, the vehicle airbag control device is configured to control the driver airbag and the passenger airbag to be deployed through the ignition unit.
Determining, by the control unit, a seating state of a passenger by receiving the 3-axis acceleration of the seat from the seating state detection unit;
Determining, by the control unit, whether a collision requiring deployment of an airbag has occurred through a collision detection unit;
Determining an airbag deployment scenario corresponding to the determined passenger seating state among a plurality of airbags provided in the vehicle when the control unit determines that a collision requiring airbag deployment has occurred; And
And controlling the plurality of airbags to be deployed through the ignition unit according to the determined airbag deployment scenario.
The method of claim 12,
In the step of determining the passenger seating state, the control unit,
Front seating with all seats facing the front, side seating with the driver's and passenger seats facing the side, and rear seating with the driver's and passenger seats facing the rear, according to the X-axis and Y-axis acceleration measurements input from the seating state detection unit. Airbag control method for a vehicle, characterized in that to determine the passenger seating state by dividing into.
The method of claim 13,
In the step of determining the passenger seating state, the control unit,
When the X-axis acceleration measurement value is less than 0 and the Y-axis acceleration measurement value is less than 0, the passenger seating state is determined as rear seating.
The method of claim 13,
In the step of determining the passenger seating state, the control unit,
When the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, the X-axis acceleration measurement value is less than the threshold value and the Y-axis acceleration measurement value is less than the threshold value, the passenger seating state is side-seated. Vehicle airbag control method, characterized in that determined as.
The method of claim 13,
In the step of determining the passenger seating state, the control unit,
When the X-axis acceleration measurement value is 0 or more and the Y-axis acceleration measurement value is 0 or more, the X-axis acceleration measurement value is more than the threshold value and the Y-axis acceleration measurement value is more than the threshold value, the passenger seating state is front-seat Vehicle airbag control method, characterized in that determined as.
The method of claim 16,
In the step of determining the passenger seating state, the control unit,
According to the Z-axis acceleration measurement value input from the seating state sensing unit, the front seating is divided into a normal seating and a relaxed seating in which the inclination of the driver's seat and the passenger seat is more than the standard value to determine the passenger seating state, but the passenger seating state is the front seating In the case of a state, if the Z-axis acceleration measurement value is more than a threshold value, the passenger seating state is determined as a normal seating state, and when the Z-axis acceleration measurement value is less than the threshold value, the passenger seating state is determined as a relaxed seating state. Airbag control method.
The method of claim 12,
In the step of determining whether a collision requiring deployment of the airbag occurs, the control unit,
A collision detection sensing value is input from the collision detection unit to calculate a displacement of the collision detection sensing value, and when the collision detection sensing value displacement is greater than or equal to a displacement threshold value, a moving average and a speed of the collision detection sensing value are calculated, When the moving average of the collision detection sensing value is equal to or greater than a moving average threshold value and the speed of the collision sensing sensing value is equal to or greater than the speed threshold value, it is determined that the airbag deployment is necessary.
The method of claim 12,
The control unit further comprises: detecting whether the belt is fastened to each seat through the belt fastening detection unit,
The control unit, when it is determined that a collision that requires airbag deployment has occurred through the collision detection unit, determines that the airbag deployment is necessary when it is detected that the belt is fastened through the belt fastening detection unit.
The method of claim 12,
In the step of controlling the plurality of airbags to be deployed, the control unit,
And controlling at least one of a driver airbag, a passenger airbag, a knee airbag, a side airbag, and a curtain airbag to be deployed through the ignition unit.
The method of claim 20,
In the step of controlling the plurality of airbags to be deployed, the control unit,
When the passenger seating state is determined as the front seating state, the ignition unit controls to deploy all of the plurality of airbags provided in the vehicle, and when the passenger seating state is determined to be a relaxed seating state among front seating, the driver airbag and passenger airbag are Airbag control method for a vehicle, characterized in that the control to be delayed deployment.
The method of claim 20,
In the step of controlling the plurality of airbags to be deployed, the control unit,
When it is determined that the passenger seating state is the side seating state, controlling the driver airbag and the passenger airbag to be deployed through the ignition unit.

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