KR101637598B1 - Method for controlling air bag module based on pre-crash information - Google Patents

Method for controlling air bag module based on pre-crash information Download PDF

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KR101637598B1
KR101637598B1 KR1020100076038A KR20100076038A KR101637598B1 KR 101637598 B1 KR101637598 B1 KR 101637598B1 KR 1020100076038 A KR1020100076038 A KR 1020100076038A KR 20100076038 A KR20100076038 A KR 20100076038A KR 101637598 B1 KR101637598 B1 KR 101637598B1
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South Korea
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information
vehicle
collision
sensor
airbag module
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KR1020100076038A
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Korean (ko)
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KR20120013799A (en
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위성돈
강석창
윤유식
최세범
조광현
손현우
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현대자동차주식회사
한국과학기술원
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Abstract

A control method of an airbag module using pre-crash information includes a first step of detecting information on an object located on the front side of the vehicle through an ultrasonic sensor of the vehicle and a radar sensor of the vehicle, A second step of comparing information on the distance to the object and the information on the distance to the object among the information on the same object detected by the radar sensor and on the object detected by the ultrasonic sensor according to the result of comparison of the information on the distance A third step of selecting at least one of information and information on the same object detected by the radar sensor and determining whether an object is located in an area where the object can collide with the vehicle based on the selected information, The fourth step of deploying the airbag module installed in the interior of the vehicle on the basis of the result of the determination as to whether or not the airbag module .

Description

TECHNICAL FIELD [0001] The present invention relates to a control method of an air bag module using information before a collision,

The present invention relates to a control method of an airbag module using pre-crash information, and more particularly, to a control method of an airbag module using information before a collision to determine a possibility of collision with a forward object or a collision type with a forward object And a control method of the airbag module capable of deploying the airbag module more safely and accurately based on the determination result.

Generally, an airbag apparatus is installed in a vehicle for the purpose of protecting a vehicle occupant from a collision between the vehicle and an external object. Such an airbag apparatus is usually provided in an interior of a vehicle to protect an occupant, a collision sensor provided on the front side of the vehicle for detecting whether the vehicle is collided with an external object, and an airbag module provided in the airbag module, And a longitudinal and lateral acceleration sensor for sensing the acceleration. The airbag apparatus having the above-described configuration usually determines whether or not the airbag module is deployed according to the collision algorithm.

Conventional collision algorithms can be largely divided into types that distinguish collision types between vehicles and external objects. The conventional collision algorithm starts the algorithm from the time when a collision between the vehicle and the external object is detected through the normal collision sensor or the longitudinal and lateral acceleration sensors regardless of the above distinction. Accordingly, since all the operations of the algorithm are based on the data on the situation after the collision, the collision algorithm itself deploying the airbag module must be very sensitive to the signals due to the collision, If an error occurs, the airbag may be opened or undeveloped.

In the case of a collision algorithm that distinguishes a collision type, data inputted through a collision sensor or an acceleration sensor changes with time, so it is difficult to accurately grasp the characteristics of the collision type. Since the information of the collision type changes with time, it is very difficult to determine the collision characteristic suitable for the collision situation and to set the expansion condition suitable for the collision characteristic. In the case of the collision algorithm that does not distinguish the collision type, it is difficult to set the deployment condition suitable for the collision situation because the airbag module is deployed by applying the same threshold value to different collision situations, It may be delayed or the airbag module may not be deployed, resulting in injury to the occupant.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for determining collision type with a forward object or collision type with a forward object, And to provide a control method of an airbag module that can deploy the airbag module more safely and accurately based on the determination result.

According to another aspect of the present invention, there is provided a method of controlling an airbag module using pre-crash information, the method comprising the steps of: sensing an object located on the front side of the vehicle through an ultrasonic sensor of the vehicle and a radar sensor of the vehicle; A second step of comparing information on the distance from the object detected by the ultrasonic sensor to information on the distance to the object in the information on the same object detected by the radar sensor, Step, and distance, and information on the same object detected by the radar sensor. Then, based on the selected information, an object can be collided with the vehicle A third step of judging whether or not the object is located in an area where the vehicle can collide with the vehicle, And a fourth step of deploying an airbag module installed in a vehicle interior based on a result of the determination.

In the third step, when the information about the distances detected by the ultrasonic sensor and the radar sensor coincide with each other within a predetermined error range, the object is detected based on the information detected by the ultrasonic sensor and the radar sensor. A collision type between the object and the vehicle based on information on the object detected by the radar sensor when the object is located in an area where the object can collide with the vehicle, Can be predicted.

The fourth step is to set the deployment condition of the airbag module on the basis of the collision type, and then determine whether or not the object is located in a collision zone with the vehicle, The airbag module can be deployed based on the deployment condition according to the measurement result of the collision sensor that detects whether or not the vehicle collides with the vehicle.

In the third step, when the information about the distances detected by the ultrasonic sensor and the radar sensor are mutually inconsistent within a predetermined error range, the object may collide with the vehicle based on the information about the object detected by the ultrasonic sensor Area, and if it is determined that the object is not located in the collision area with the vehicle, the fourth step may not deploy the airbag module.

If the distance to the object is within 1/2 of the width of the vehicle and the collision between the object and the vehicle is predicted to occur within 0.1 second according to the information about the object, It can be determined that it is located in the collision-capable area.

The control method of the airbag module using the pre-crash information according to the present invention acquires information on the possibility of collision between the preceding object and the vehicle and the collision type through the ultrasonic sensor and the radar sensor before the collision occurs, It is possible to prevent the morning of the airbag module in the nonconducting condition and appropriately deploy the airbag module according to the collision type by judging whether the module is deployed or not.

Also, since the control method of the airbag module using the pre-crash information according to the present invention is based on the information through the ultrasonic sensor and the radar sensor, the crash algorithm can be added to the existing algorithm without adding a separate device to the vehicle, It is possible to improve the stability and commerciality of the airbag module without increasing the weight.

1 is a flowchart showing a control method of an airbag module according to an embodiment of the present invention;
FIG. 2 is a conceptual diagram showing each configuration for implementing a control method according to an embodiment of the present invention. FIG.
FIG. 3 is a graph showing an experimental result of a yaw rate response according to input of step steering

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments. For reference, the same numbers in this description refer to substantially the same elements and can be described with reference to the contents of other drawings under these rules. The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

FIG. 1 is a flowchart showing a control method of an airbag module according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram showing each configuration for implementing a control method according to an embodiment of the present invention. 1 and 2, a control method according to an embodiment of the present invention will be described in detail with reference to FIG. 1 and FIG. 2. First, an ultrasonic sensor 110 of a vehicle and a radar sensor 120 of a vehicle And detects information about an object located on the front side of the vehicle (S110).

Here, the ultrasonic sensor 110 detects information about an object located in a short distance. The ultrasonic sensor 110 is capable of detecting distance information about a forward object, detecting not only a moving object but also a stationary object, and the resolution of the distance information is higher than that of the radar sensor 120 or the laser sensor It is a sensor suitable for acquiring the distance information to the forward object in the situation just before the collision. Since the ultrasonic sensor 110 can provide information on the rate of change of the distance, the speed of the forward object can be grasped based on the information.

The radar sensor 120 is a sensor capable of detecting not only near objects but also objects located at long distances. Since the radar sensor 120 can detect not only the distance to the front object but also the velocity and the lateral position of the front object, information on the directionality of the front object can be provided. Accordingly, the radar sensor 120 is a sensor suitable for acquiring information on the trajectory of the forward object for predicting the type of collision between the forward object and the vehicle.

As a result, when the ultrasonic sensor 110 and the radar sensor 120 are used together, it is possible not only to accurately acquire the distance information on the forward object including the stationary object but also to estimate the type of collision between the forward object and the vehicle It is possible to more reliably generate information on the preceding object before the collision. Also, since the ultrasonic sensor 110 and the radar sensor 120 are universally mounted on an advanced vehicle, it is possible to use an existing sensor without using additional sensors.

After detecting the information on the object located on the front side of the vehicle through the ultrasonic sensor 110 and the radar sensor 120 as described above, the object on which the forward object is stopped based on the information on the distance to the front object, Or whether it is a moving object (S120). Since the information on the distance to the forward object generated by the ultrasonic sensor 110 and the radar sensor 120 is not within a certain error range because the radar sensor 120 can not detect the information about the stationary object, The forward object can be determined as an object to be moved and the forward object can be determined as a stationary object if the forward objects are mutually inconsistent within a certain error range.

The reason for distinguishing the forward object is that it is difficult to predict the collision type only with information from the ultrasonic sensor 110 or the radar sensor 120 for a stationary object. As will be described later, the control method according to the present embodiment determines whether there is a possibility of collision between the forward object and the vehicle when the forward object is determined as the stopped object, and when it is determined that the forward object is the moving object In addition to the possibility of collision, it also determines the type of collision between the forward object and the vehicle.

If it is determined that the forward object is a stopped object according to the comparison result, it is determined whether the forward object is located in a collision area with the vehicle based on information about the forward object through the ultrasonic sensor 110 (S132) . As described above, the ultrasonic sensor 110 can acquire information about a stationary object, but basically, it can generate information about a distance to a forward object. The radar sensor 120 basically includes a It is difficult to predict the collision type with respect to the stationary object only with the ultrasonic sensor 110 and the radar sensor 120. [

Accordingly, when it is determined that the forward object is a stopped object according to the result of the comparison of the distance information, the collision type prediction can be performed in the same manner as the existing collision algorithm by using the collision sensors 132 and 134 It can be solved by using the acceleration sensors 142 and 144. That is, when it is determined that the forward object is a stopped object, the collision type is predicted based on the information through the collision sensors 132 and 134 and the acceleration sensors 142 and 144 in the same manner as the existing airbag device, The deployment condition of the airbag module can be set.

However, when it is determined that the possibility of collision between the forward object and the vehicle is low according to the information through the ultrasonic sensor 110, that is, the distance to the forward object, that is, If it is determined that the airbag module is not to be operated, the airbag non-operation information is transmitted to the airbag device to induce the airbag module to be non-activated (S133). With this configuration, even if the collision sensors 132 and 134 or the acceleration sensors 142 and 144 erroneously detect a collision of the vehicle due to an impact transmitted to the vehicle when the vehicle runs on a rough road, .

On the other hand, when it is determined that the forward object is a moving object according to the comparison result of the distance information, it is determined whether the forward object is located in the collision area with the vehicle based on the information through the ultrasonic sensor 110 and the radar sensor 120 (S136). If it is determined that the forward object is located in a collision area with the vehicle, the collision type between the forward object and the vehicle is predicted based on the information through the radar sensor 120 (S137). As described above, since the radar sensor 120 can generate information on the trajectory of the preceding object, based on this information, the type of collision between the preceding object and the vehicle, for example, frontal collision, offset collision, It is possible to predict whether or not the collision is caused.

If it is determined that the front object is determined to be a moving object and the possibility of a collision between the forward object and the vehicle is determined, the deployment condition of the airbag module is set in advance based on the collision type before the collision occurs. If the deployment condition of the airbag module is set in advance by utilizing the pre-crash information as described above, the deployment condition may be set on the premise of collision as in the conventional collision algorithm, or damage may occur to the sensor due to collision, It is possible to deploy the airbag module more safely and accurately since there is no need to consider the change.

As a result, the control method according to the present embodiment determines the possibility of collision between the forward object and the vehicle based on the information about the forward object through the ultrasonic sensor 110 when it is determined that the forward object is a stopped object, As a result of the determination, if it is determined that there is no possibility of collision, the airbag non-switching information is transmitted to the airbag device so that the airbag module can be prevented from being damaged due to the senses of the collision sensors 132 and 134 and the acceleration sensors 142 and 144 Can be prevented. In the control method according to the present embodiment, when the forward object is determined as an object to be moved, the possibility of collision between the forward object and the vehicle based on the information about the forward object through the ultrasonic sensor 110 and the radar sensor 120 If it is determined that there is a possibility of a collision, the collision type is predicted based on the acquired information before the collision occurs, and the deployment condition of the airbag module is set in advance according to the result of the prediction, It is possible to deploy the airbag module more accurately and safely when it is damaged.

In the control method according to the present embodiment, when the stationary object does not exist in the collision area and the moving object exists in the collision area, the control method according to the present embodiment determines whether the airbag module is deployed or not according to the above- , But in other cases, that is, when the stationary object exists in the collision zone and the moving object does not exist in the collision zone, information on the collision type is transmitted to the collision sensor (132, 134).

That is, the control method according to the present embodiment may be configured as a concept added to the collision algorithm implemented in a conventional airbag device. The control method according to the present embodiment utilizes the ultrasonic sensor 110 and the radar sensor 120 that are typically provided in an advanced vehicle, The stability and the commerciality of the airbag device can be further improved.

In order to further improve the stability of the airbag apparatus when the above-described algorithm is added to the conventional collision algorithm as described above, it is preferable to determine whether collision has occurred through the following process. If the collision is detected through the collision sensors 132 and 134 and the acceleration sensors 142 and 144 provided in the conventional airbag device, the reliability of the collision may be high. However, There is a problem that there may be a time delay from the collision to the deployment of the airbag module. When the collision is detected through the ultrasonic sensor 110 and the radar sensor 120 as in the control method according to the present embodiment, it is possible to detect the collision in advance, and the information about the collision does not change with time However, there is a problem that the reliability of collision may be lowered.

In the airbag device, since the reliability of the collision should be emphasized, the occurrence of the collision is basically determined through the collision sensors 132 and 134 or the acceleration sensors 142 and 144, When the occurrence of a collision is predicted through the ultrasonic sensor 110 or the radar sensor 120 in order to eliminate the problem of the change of the data according to the collision or the failure of the sensor due to the collision, If the occurrence of the collision is recognized through the collision sensors 132 and 134 or the acceleration sensors 142 and 144 after predicting the data of the collision type in advance and setting the deployment condition of the airbag module based on such data in advance The airbag module can be deployed according to the predetermined deployment conditions without resorting to the collision sensors 132 and 134 and the like.

For reference, the judgment as to whether the front object is located in the collision area, that is, whether there is a possibility of collision between the front object and the vehicle, may be based on the following criteria. That is, the distance to the forward object is within 1/2 of the width of the vehicle, and the collision between the forward object and the vehicle, according to the information about the forward object acquired from at least one of the ultrasonic sensor 110 and the radar sensor 120 Is expected to occur within 0.1 second, it can be judged that the forward object is located in the collision area with the vehicle.

As described above with reference to this criterion, before a collision occurs between the vehicle and the front object, the driver of the vehicle usually brightens the brake or hastily operates the steering. At this time, the reaction time according to the braking operation is usually 0.6 to 0.9 seconds, and the reaction time according to the steering operation is usually 0.3 to 0.7 seconds. That is, operation by steering is faster than operation by braking. The yaw rate response according to the input of the step steering is experimentally obtained based on the steering operation. As shown in the graph of FIG. 3, the minimum yaw rate response The time is 0.1 second. As a result, it is predicted that the collision between the forward object and the vehicle will occur within 0.1 second according to the information about the forward object obtained from at least one of the ultrasonic sensor 110 and the radar sensor 120, It is judged that a collision will occur between the front object and the vehicle.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be understood that various modifications and changes may be made in the present invention. Accordingly, it is to be understood that the scope of the present invention is defined by the claims appended hereto, and all of its equivalents or equivalents are included in the scope of the present invention.

110: Ultrasonic sensor 120: Radar sensor
132: left front collision sensor 134: right front collision sensor
142: longitudinal acceleration sensor within the airbag module
144: transverse acceleration sensor in airbag module

Claims (5)

A first step of detecting information on an object positioned on the front side of the vehicle through an ultrasonic sensor of the vehicle and a radar sensor of the vehicle;
A second step of comparing information on the distance to the object among the information on the object detected by the ultrasonic sensor and information on the distance to the object among information on the same object detected by the radar sensor;
Wherein the control unit selects at least one of information about an object detected by the ultrasonic sensor and information about the same object detected by the radar sensor according to a result of comparison of the distance information, A third step of judging whether or not it is located in a possible area; And
And a fourth step of deploying an airbag module installed in a vehicle interior based on a result of the determination as to whether or not the object is located in a collision area with the vehicle,
In the third step,
When the information about the distance detected by the ultrasonic sensor and the radar sensor coincide with each other within a predetermined error range, based on the information about the object detected by the ultrasonic sensor and the radar sensor, The collision type between the object and the vehicle is predicted based on the information about the object detected by the radar sensor when the object is located in the collision area with the vehicle. A method of controlling an airbag module using pre-crash information. delete The method according to claim 1,
Wherein the fourth step includes setting a deployment condition of the airbag module based on the collision type and then determining whether the object is located in a collision area with the vehicle or not, Wherein the airbag module is deployed based on the deployment condition according to a measurement result of a collision sensor that detects whether the vehicle collides with the vehicle. The method according to claim 1,
The third step is a step of detecting an area where the object can collide with the vehicle based on the information about the object detected by the ultrasonic sensor when the information about the distance detected by the ultrasonic sensor and the radar sensor are mutually inconsistent within a predetermined error range, And the fourth step does not deploy the airbag module if it is determined that the object is not located in an area where the object can collide with the vehicle. . The method according to claim 1,
If the distance to the object is within 1/2 of the width of the vehicle and the collision between the object and the vehicle is predicted to occur within 0.1 second according to the information about the object, Wherein the control unit determines that the vehicle is located in a possible area of the vehicle.
KR1020100076038A 2010-08-06 2010-08-06 Method for controlling air bag module based on pre-crash information KR101637598B1 (en)

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KR101428260B1 (en) 2012-12-10 2014-08-07 현대자동차주식회사 Method for unfolding external air bag
KR101510006B1 (en) * 2013-12-11 2015-04-07 현대자동차주식회사 Method for unfolding external air bag
KR101583927B1 (en) 2014-05-12 2016-01-11 현대자동차주식회사 Method for unfolding external air bag
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KR20200051085A (en) 2018-11-02 2020-05-13 현대자동차주식회사 Vehicle and control method for the same

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