KR20150062024A

KR20150062024A - A crash sensing appliance and control method of a vehicle

Info

Publication number: KR20150062024A
Application number: KR1020130146521A
Authority: KR
Inventors: 하민규
Original assignee: 현대모비스 주식회사
Priority date: 2013-11-28
Filing date: 2013-11-28
Publication date: 2015-06-05

Abstract

The present invention relates to a collision detection apparatus for a vehicle and a control method thereof, comprising: an airbag module; a collision detection sensor installed in the center of an upper side of a front end module installed in a front side of a vehicle, and measuring a measurement value of a front rotational angle in a collision; an airbag control unit controlling the airbag module, and measuring a displacement value which is calculated with the measurement value measured in the collision detection sensor and a predetermined initial value to enable operation time of the airbag module to be advanced by lowering a threshold value if the measurement value is lower than the displacement value.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a collision detection apparatus and a control method for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a collision sensing apparatus and a control method for a vehicle, and more particularly, to improving a collision sensing ability by reducing a delay of collision of a vehicle.

BACKGROUND ART [0002] In recent years, accidents of a vehicle have become frequent. In general, a frontal impact sensor (FIS) is installed on a side member of a front end module to detect a collision of a vehicle. The FIS senses the collision position of the vehicle by the collision object and transmits a signal to the airbag module, and the airbag module actuates the airbag corresponding to the collision position.

However, when the collision object is largely shifted to the left or right of the vehicle body, the impact of 40% or 25% of the vehicle side is delayed.

If the transmission of the FIS signal is delayed, the threshold level of the airbag control unit is not changed, and the airbag deployment time is delayed.

The FIS sensing the frontal collision signal can not accurately sense the small overlap signal value only by adding the Y axis on the basis of the X axis and the dispersion of the collision energy depends on the presence or absence of the braking action at the moment of collision, The behavior could also cause a deviation.

In order to detect such a collision, four collision sensing devices have been installed to detect all collisions of the front, rear, and right sides. However, there is a problem in that the installation cost is increased.

SUMMARY OF THE INVENTION The present invention provides a vehicle collision detection apparatus and a control method thereof,

Since the collision energy dispersion varies depending on the presence or absence of the braking action at the moment of impact, the deviation of the passenger behavior after the collision is eliminated, and the collision is quickly detected by installing the FEM (Front End Module) .

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, in a collision sensing apparatus and method for a vehicle according to an embodiment of the present invention, an airbag module and a front end module installed at the front of the vehicle, And a control unit for controlling the collision detection sensor and the airbag module to measure a measured value measured by the collision detection sensor and a calculated displacement value based on the set initial value, and if the displacement value is larger than the measured value, decrease the threshold value And an airbag control unit for applying an operation timing of the airbag module in advance.

The details of other embodiments are included in the detailed description and drawings.

According to the vehicle collision sensing apparatus and control method of the present invention, one or more of the following effects can be obtained.

By using the collision detection sensor, it is possible to transmit information about the steering angle, engine revolution per minute, and the like required for the steering, so that the steering design can be assisted. In the event of a small overlap collision, It is possible to expect an effect of reducing the injury value by improving the sensing ability and by reducing the number of collision detection sensors which are used in a plurality of ways, the effect of reducing the cost can be obtained.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a plan view showing an embodiment in which a collision sensing apparatus for a vehicle according to the present invention is mounted,
2 is a plan view showing a collision position by the collision sensing apparatus of the vehicle,
Figure 3 is a flow chart controlled by one embodiment in accordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings for explaining a collision sensing apparatus and a control method of a vehicle according to embodiments of the present invention.

A preferred vehicle collision sensing apparatus and control method can be changed by a person skilled in the art, and in the embodiment of the present invention is a collision sensing apparatus and a control method of a vehicle.

1 is a plan view showing an embodiment in which a collision sensing apparatus for a vehicle according to the present invention is mounted.

Referring to FIG. 1, a collision sensing apparatus of a vehicle includes a front end module (not shown) on which an airbag module is mounted, a collision detection sensor 20 installed on the front end module, And an airbag control unit for controlling the airbag.

An airbag module (not shown) is mounted on the vehicle and applies an operation to the collision of the vehicle in the airbag control section.

The collision detection sensor 20 is installed at the center of the upper side of the front end module 10 installed in front of the vehicle, and measures a measurement value of a forward rotation angle at the time of a collision.

The collision detection sensor 20 measures the measurement value according to the rotation angle using a yaw rate device. When the vehicle collides, the horizontal line of the front end module 10 is changed to obtain the rotation angle (yaw angle). At this time, the collision detection sensor 20 is based on the angular velocity. The collision detection sensor 20 is supplied with energy according to the impact of the vehicle.

The front end module 10 is installed at the front of the vehicle, and the collision detection sensor 20 is installed at the upper center.

More specifically, the front end module 10 is formed by side members disposed on both side surfaces of the front end module 10, an upper member disposed on the upper side, and a lower member disposed on the lower side, , When the collision detection sensor (20) is mounted at the center of the upper member disposed on the front end module (10) and the side member is broken due to a collision of the vehicle, the collision detection sensor (20) Measures the measured value according to the angle, and the airbag control unit detects the measured value.

An airbag control unit (not shown) controls the airbag module 10 to measure a measured value measured by the collision detection sensor 20 and a calculated initial value, and determines whether the displacement value is greater than the measured value The threshold value is lowered and the operation timing of the airbag module 10 is accelerated.

2 is a plan view showing a collision position by the collision sensing apparatus of the vehicle,

1 and 2, the distance between the left and right ends of the vehicle is a reference on which the airbag module 10 is mounted. Here, the force of the Coriolis is used and the distance between the left and right ends of the upper side of the vehicle at the mounting position of the airbag control portion is set to R. When the amount of displacement is calculated by the following physical equation,

.

When the amount of displacement is larger than the measured amount by comparing with the measured collision detection value measured by the collision detection sensor 20, the operating threshold of the airbag cushion is changed by lowering the predetermined threshold to the airbag module 10 to operate.

The force acting on a rotating object in a rotational coordinate system is equal to the unit of acceleration. The formula is FCoriolis = 2m (v × Ω), m is mass, v is the velocity in the system, and Ω is the angular velocity in the system.

Since the side member material is steel, the energy that the side member breaks down is transferred in a very short time. That is, the collision point in the vehicle body can be determined by measuring the vehicle speed at a distance from the collision detection sensor 20 to the collision point.

In one embodiment, when the vehicle is impacted by a certain portion in the oblique direction, the vehicle body is rotated in the collision direction, and when the rotation angle of the rotated portion of the impact portion is sensed by sensing the energy level, it is possible to distinguish the vehicle body rotation. At this time, the airbag control unit 30 determines a predetermined airbag control unit threshold level. Here, a certain portion of the collision portion is preferably 25%.

A collision sensing apparatus and a control method of a vehicle according to the present invention will now be described.

3 is a flowchart according to an embodiment of the present invention.

The left collision of the side member will be described as an example with reference to Figs. 2 and 3. Fig. When a collision occurs in front of the vehicle, the airbag control unit S100 measures a displacement value S120 through a predetermined pass band in a low pass filter (S110). The low pass filter (S110) is a frequency band whose pass band is lower than the cutoff frequency, preferably 90/200 Hz.

The displacement value is compared with the displacement threshold value, and if the displacement value is greater than or equal to the displacement value, a moving average value and a velocity value are calculated. Here, the velocity value is stored as the first velocity value and the second velocity value, respectively. If the first velocity value is greater than or equal to the preset threshold value, the first velocity value is compared with the measured value of the collision sensor .

The collision detection sensor S200 is measured at the same time as the airbag control unit S100, passes through a predetermined passband in the low-pass filter S210, and compares the collision detection measured value with an arbitrary predetermined angle at step S220. The passband of the low-pass filters S110 and S210 is a frequency band lower than the cut-off frequency, preferably 90/200 Hz.

If the collision sensing measurement value is greater than or equal to the comparison value, the moving average threshold value S230 and the speed threshold value S240 are measured. If the collision sensing measurement value is smaller, (S220).

The velocity value is compared with the measured value measured by the collision detection sensor and a preset arbitrary angle if the velocity value is greater than or equal to a preset threshold value. It is preferable that the arbitrary angle is set to 40degree / s (S220).

The moving average threshold value (S230) is measured when the collision sensing measurement value is greater than or equal to the setting angle by comparing the collision sensing measurement value (S220). The moving average threshold value is compared with the stored moving average value (S300). The moving average threshold value is compared with the previously stored moving average value (S300). If the moving average value is equal to or greater than the moving average value, the airbag operates as set in the shaping logic . If the measured value is less than or equal to a preset arbitrary angle, a moving average threshold value and a speed threshold value are obtained (S230).

The speed threshold value (S240) is measured when the collision sensing measurement value is greater than or equal to the setting angle by comparing the collision sensing measurement value (S220). The speed threshold value is compared with the previously stored second speed value (S310). The speed threshold is compared to the pre-stored second speed value, and if the second speed value is greater than or equal to the speed threshold, the airbag operates as set in the shaping logic.

The moving average threshold value is compared with the displacement value and the displacement threshold value when the measured value is less than or equal to the arbitrary angle and compared with the moving average value when the displacement value is less than or equal to the displacement threshold value. If the moving average value is less than or equal to the moving average threshold value, the airbag module operates. At this time, if the moving average value is equal to or greater than the moving average threshold value, the airbag module senses the moving threshold value as a first movement threshold value and lowers the threshold value so that the airbag module operates. If the moving average threshold value is smaller than the moving average value, the moving average value is calculated again (S250).

The speed threshold value is lowered when the amount of displacement is larger than the metering amount, thereby operating the airbag module. At this time, if the speed value is greater than or equal to the speed threshold value, the first speed threshold value is sensed and the threshold value is lowered to operate the airbag module. The speed value is compared with the speed threshold value, and if the speed threshold value is large, the speed value is calculated again (S260).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

<Detailed Description of Main Drawings>
10: airbag module 20: collision detection sensor

Claims

Airbag module;
A collision detection sensor installed at the upper center of the front end module installed at the front of the vehicle to measure a measurement value of a forward rotation angle at the time of a collision; And
Wherein the control unit controls the airbag module and measures a measured value measured by the collision detection sensor and a calculated initial value, and when the displacement value is larger than the measured value, decreases the threshold value, And an airbag control unit for controlling the collision of the vehicle.

A first step of measuring a measurement value of a forward rotation angle at the time of a collision detection sensor collision;
A second step of comparing a displacement value measured in real time at the same time as the first step with a predetermined displacement threshold value;
A third step of sensing the first step in the second step and comparing the measured value with an arbitrary preset angle;
And a fourth step of operating the airbag module when the result of the second step and the third step is lower than the threshold value if the displacement value is smaller than the measurement value.

3. The method of claim 2,
The second step comprises:
If the displacement value measured in real time is equal to or greater than a predetermined displacement threshold value, a moving average value obtained by calculating a moving average and a velocity value calculated by calculating a velocity are equal to or greater than a preset threshold value for the velocity value, A method of controlling a collision sensing device in a sensing vehicle.

The method of claim 3,
In the third step,
And if the measured value is greater than or equal to a preset arbitrary angle in the second step, a moving average threshold value and a velocity threshold value are obtained.

5. The method of claim 4,
In the fourth step,
If the moving average value is equal to or greater than the moving average threshold value in the third step, the airbag module is activated by detecting the first movement threshold value and decreasing the threshold value, and if the speed value is less than or equal to the speed threshold value A method for controlling a collision sensing apparatus of a vehicle in which an airbag module is operated by detecting a first speed threshold value and decreasing a threshold value.