KR20160052211A - Control method for air bag - Google Patents

Abstract

According to an embodiment of the present invention, a method for controlling an airbag comprises: a first step of receiving X, Y physical quantities, a second step of filtering the X, Y physical quantities, a third step of processing the X, Y physical quantities to be the required physical quantity; a fourth step of predicting a collision orientation angle using the X, Y physical quantities; and a fifth step of deciding a collision area using the X, Y physical quantities.

Description

[0001] CONTROL METHOD FOR AIR BAG [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an airbag control method for predicting a collision angle and a collision amount of a vehicle, thereby determining whether to deploy the airbag without distinguishing between positive and side airbags.

In general, an air bag (AirBag) is a device that protects a passenger in a car from a shock in the event of a vehicle collision. The Airbag Control Unit (ACU) is a device that determines the deployment of the airbag by measuring the impact physical quantity. When the front surface of the vehicle collides with an obstacle, a physical quantity such as an acceleration of the front surface is measured. When the vehicle front surface exceeds a predetermined threshold, the front air bag is deployed. When the vehicle side collides with an obstacle, the lateral physical quantity is measured. Developed.

However, during the collision of the actual vehicle, collision between the fender of the vehicle and the front door often occurs due to instinct to avoid the driver's collision. When collision occurs between the X and Y angles of the inclined portion between the fender and the front door, the physical quantities of X and Y are smaller than the physical values of the conventional front and rear sides, .

As an example, Korean Patent Registration No. 10-0831500 discloses a " selectively deploying air bag device for a vehicle and a control method thereof ".

In order to solve the above problems, an embodiment of the present invention provides an airbag control method for predicting a collision angle and a collision amount of a vehicle to determine whether to deploy the airbag without distinguishing between the front and side airbags.

In order to achieve the above object, an airbag control method according to an embodiment of the present invention includes: a first step of obtaining X and Y physical quantities; A second step of filtering X and Y physical quantities; A third step of processing the physical quantities of X and Y into required physical quantities; A fourth step of predicting a collision direction angle using physical quantities of X and Y; And a fifth step of determining a collision area using X and Y physical quantities; . ≪ / RTI >

A sixth step of calculating a threshold value in the collision area determined after the fifth step; a seventh step of determining whether to deploy the airbag by comparing the calculated threshold value and the impact value; A seventh step of determining whether the side air bag is deployed according to whether a crash mode and a main logic are satisfied; As shown in FIG.

In addition, the collision direction angle predicted in the fourth step can be used to obtain the actual impact scalar value using X, Y.

In the third step, the X, Y physical quantities can be processed into physical quantities such as required speed, displacement, and energy.

Further, the collision direction angle and the impact amount can be calculated by the X and Y physical quantities.

Further, the collision angle can be calculated by an equation such as "? = Tan? (- 1) [y / x]".

Further, the impulse amount can be calculated by an equation such as "U = X '/ 2 (Cos?) + Y' / 2 (Sin?).

According to the airbag control method according to the embodiment of the present invention, the collision angle and the collision amount of the vehicle can be predicted to determine whether or not the airbag deployment can be performed without distinguishing between the right and left side airbags.

Further, reliability of deployment of the airbag can be improved.

It is also possible to deal with local slope collision (IIHS Small Over lap).

In addition, it is possible to solve the problem of unfolding the airbag against the warp collision.

1 is a flowchart of an airbag control according to a preferred embodiment of the present invention.
FIG. 2 is a diagram illustrating an angle prediction and an impact amount calculation method using X, Y-axis physical quantities according to a preferred embodiment of the present invention.
3 is a diagram illustrating a frontal crash mode in a crash mode according to an embodiment of the present invention.
4 is a diagram illustrating a side crash mode during a crash mode according to an exemplary embodiment of the present invention.
5 is a view illustrating an oblique impact mode in a crash mode according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating main logic according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In addition, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.

The airbag control method according to the embodiment of the present invention can predict the collision angle and the collision amount of the vehicle and determine whether to deploy the airbag without discriminating between the front and side algorithms.

As shown in FIG. 1, an airbag control method according to an embodiment of the present invention includes a first step of acquiring X and Y physical quantities, a second step of filtering X and Y physical quantities, A third step of processing physical quantities into necessary physical quantities such as speed, displacement and energy, a fourth step of predicting the crush angle using the X and Y physical quantities, A sixth step of calculating a threshold value of the determined collision area (Metric Threshold), a seventh step of determining whether to deploy the airbag by comparing the calculated threshold value and the impact value (Main Logic) And determining whether the vehicle is deployed in accordance with whether a crash mode and a main logic are satisfied.

Meanwhile, the predicted angle in the fourth step is used to calculate the actual impact scalar value using X and Y (Variable Calculation).

As shown in FIG. 2, the angular prediction and the amount of impact can be calculated using the X and Y axis physical quantities. The calculation method is as follows.

Crash Angle? = Tan? (- 1) [y / x]

Crash Scalar U,

The forces X 'and Y', which are transmitted to X and Y,

a) X '= Cos? | U |

b) Y '= Sin? | U |

to be.

U,

c) U = X '/ (Cos?), U = Y' / (Sin?)

We can find U if we have only X '(Y') and θ in the above equation, but if we use U 'and X' to improve reliability,

d) 2U = X '/ (Cos?) + Y' / (Sin?)

          U = X '/ 2 (Cos?) + Y' / 2 (Sin?)

to be. By thus obtaining the direction and the magnitude, the vector value for the collision can be predicted.

The following describes the Crash Mode. In the crash mode, the airbag is not deployed unless the three conditions, frontal collision condition, side collision condition, and oblique collision condition, are met.

Specifically, as shown in Fig. 3, the frontal collision condition is determined as a frontal collision if the physical quantity ratio such as the speed of X, the speed of Y, etc., exceeds the X-axis violet threshold value and exceeds the black threshold value. If it is determined that the collision is a frontal collision, the collision mode is maintained by latching for a predetermined period.

As shown in Fig. 4, the side collision condition is determined as a side collision if the physical quantity such as the speed of X, the speed of Y, etc., exceeds the X-axis red threshold and the black threshold. If it is determined as a side collision, the collision mode is maintained by latching for a predetermined period.

As shown in Fig. 5, the oblique collision condition is judged to be an oblique collision if the physical quantity such as the speed of X, the speed of Y and the like has a physical quantity ratio exceeding two threshold values of X-violet and red and exceeding a black threshold value. If the collision is judged to be an oblique collision, the collision mode is maintained by latching for a predetermined period.

The following describes the main logic. The thresholds to be compared with U are selected and compared by the frontal, lateral and inclined cases determined in the crash mode. If the comparison exceeds the threshold value, the airbag deployment for that mode is determined. As shown in Fig. 6, the side collision condition is determined as a side collision if the physical quantity such as the speed of X, the speed of Y, etc., exceeds the X-axis red threshold value and exceeds the black threshold value. If it is determined as a side collision, the collision mode is maintained by latching for a predetermined period.

The airbag control method according to the embodiment of the present invention will be described in more detail as follows.

≪ Low pass filter >

A low-pass filter is used to improve the reliability of the input data (Data).

≪ Data processing >

The sensor used in the airbag control unit (ACU) uses an acceleration sensor. Integration of the acceleration data once becomes the speed, and if it is integrated twice, it becomes the displacement. The energy can be obtained by squaring speed. These values are input to each logic.

≪ Variable Calculation >

And outputs U by using the input value X '/ 2 (Cos?) + Y' / 2 (Sin?).

<Crash Angle>

Crash Angle θ = tan ^ (1) The collision angle is output using the formula of Y / X.

<Crash Mode>

1) Determine the collision area through X physical quantity versus Y physical quantity.

2) Select the current collision area from the front, the slope, and the side by using three thresholds in total.

4) If the vector value for X, Y exceeds the frontal threshold (X-axis red), it is the front. If it exceeds the lateral threshold (Y-axis red), it is the side. Here, the minimum threshold box (black box) must be exceeded to determine a collision mode. If the minimum threshold box is not exceeded, it is not recognized as a collision.

5) The determined mode of the front, side, and tilt calculates the threshold of the corresponding mode at the time of calculating the threshold value.

<Main Logic>

1) Compares the corresponding threshold value of the collision mode with U, and judges whether or not it is expanded.

<Fire Logic>

1) Determine whether to deploy according to the conflict mode of the crash mode and the satisfaction of the main logic.

2) If front mode & main logic satisfies, front development

3) If lateral mode & main logic is satisfied, side development

4) If slope mode & main logic & (θ Threshold <θ) is satisfied,

As described above, the airbag control method according to the embodiment of the present invention can determine whether to deploy the airbag without predicting the frontal and side airbags by predicting the collision angle and the collision amount of the vehicle. Further, reliability of deployment of the airbag can be improved. Also, it is possible to cope with a local inclination collision (IIHS Small Over lap), and it is possible to solve the problem of unfolding of the airbag against an oblique collision.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as falling within the scope of the present invention.

10: Vehicle

Claims (7)

A first step of acquiring X, Y physical quantities;
A second step of filtering X and Y physical quantities;
A third step of processing the physical quantities of X and Y into required physical quantities;
A fourth step of predicting a collision direction angle using physical quantities of X and Y; And
A fifth step of determining a collision area using X and Y physical quantities;
Wherein the airbag control method comprises the steps of:
The method according to claim 1,
After the fifth step,
A sixth step of calculating a threshold value in the determined collision area;
A seventh step of determining whether to deploy the airbag by comparing the calculated threshold value and the impact value; And
A seventh step of determining whether to deploy the side airbag according to whether the crash mode and the main logic are satisfied;
Further comprising the steps of:
The method according to claim 1,
In the fourth step,
Wherein the predicted collision direction angle is used to calculate an actual impact scalar value using X, Y. &lt; Desc / Clms Page number 20 &gt;
The method according to claim 1,
In the third step,
X, and Y physical quantities are processed into physical quantities such as required speed, displacement, and energy.
The method according to claim 1,
Wherein the collision direction angle and the impact amount are calculated using the X and Y physical quantities.
The method of claim 5,
The collision angle
"? = tan? (- 1) [y / x]"
And the airbag is calculated by the following equation.
The method of claim 5,
The above-
"U = X '/ 2 (Cos?) + Y' / 2 (Sin?
And the airbag is calculated by the following equation.

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