KR20200012593A - Collision detection body panel and airbag system using same - Google Patents

Abstract

Disclosed are a collision detection vehicle body panel and an airbag system using the same. According to embodiments of the present invention, the airbag system using a collision detection vehicle body panel comprises: a vehicle body panel made of a composite material to have optical fiber integrally implanted thereinto; a fiber Bragg grating sensor unit to input incident light into the optical fiber implanted into the vehicle body panel, and generate a collision detection signal when a change of an output light outputted by penetrating a fiber Bragg grating is detected; an electronic control unit (ECU) to receive the collision detection signal generated by the fiber Bragg grating sensor unit in accordance with deformation of the vehicle body panel during an external collision to operate an airbag; and an airbag operating module to deploy the airbag by injecting high-pressure gas instantaneously created in accordance with an airbag operating signal applied by the ECU.

Description

Collision detection body panel and airbag system using the same {COLLISION DETECTION BODY PANEL AND AIRBAG SYSTEM USING SAME}

The present invention relates to a collision sensing vehicle panel and an airbag system using the same, and more particularly, to a collision sensing vehicle panel in which an optical fiber grating sensor for detecting collision / displacement is integrally implanted and an airbag system using the same.

In general, the vehicle is equipped with a collision sensor to protect the driver in the event of an accident, and the airbag is activated when a collision signal is detected.

The collision detection sensor is classified into a front collision detection sensor located in the front lower end of the engine room and a side collision detection sensor embedded in the door according to the application portion of the vehicle body.

Conventional vehicle attachment type collision detection sensor is a component that detects the acceleration or pressure in the initial stage of the collision to deliver to the airbag control device.

For example, FIG. 1 shows a vehicle to which a conventional collision detection sensor is applied.

Referring to FIG. 1, the accelerometer type front / side impact sensor (FIS / SIS) and the pressure type side impact detection sensor (PSIS) are widely used in a conventional vehicle. have.

However, the conventional collision detection sensor has a problem that the collision detection is not properly depending on the collision direction there is a problem that the airbag deployment does not work properly at the critical accident moment is a threat to the safety of passengers.

Matters described in this Background section are intended to enhance the understanding of the background of the invention, and may include matters other than the prior art already known to those skilled in the art.

An embodiment of the present invention is a collision detection body panel and an airbag system using the fiber grating (Fiber Bragg Grating) sensor integrated into the composite body panel to detect the collision / displacement, and operate the air bag using the detected signal To provide.

According to an aspect of the present invention, the collision detection vehicle body panel applied to the vehicle, the vehicle body panel is formed of a composite material and the optical fiber is integrally implanted therein; A light source input module for converting electrical energy into a laser light source and inputting the incident light of the optical fiber implanted in the vehicle body panel; An output light receiving module configured to receive output light passing through the optical fiber grating in the optical fiber and detect an output light wavelength; And a control module for generating a collision detection signal when it is determined that a deformation is generated due to a mismatch between the detected output light wavelengths and a reference output light within an allowable threshold range.

In addition, the vehicle body panel may be implanted between the laminated surface of the composite material made of a carbon fiber reinforced plastic when laminated molding.

In addition, the optical fiber may be implanted in a loop shape along the area of the vehicle body panel.

In addition, the optical fiber is made of silica glass to form the optical fiber grid therein, the germanium (Ge) is added to the core for improving the refractive index; A cladding that protects the core and is formed to have a relatively low refractive index compared to the core for total reflection of the incident light; And an outer shell coated on the outermost portion to protect the core and the cladding.

In addition, the vehicle body panel may be configured in at least one vehicle body of a door inner, a door outer, an impact beam, a fender, and a bumper beam.

In addition, the coupler is connected to the input terminal of the optical fiber is incident to the light source received by the light source input module, for outputting the branched reflected light reflected by the optical fiber grid; And a reflected light receiving module detecting the reflected light wavelength according to the lattice spacing of the optical fiber grating when the reflected light is input from the coupler.

In addition, the control module may generate a collision detection signal when it is determined that the deformation is generated by mismatching the reflected light wavelength detected by the reflected light receiving module within the allowable threshold range compared to the reference reflected light.

In addition, the control module may generate a collision detection signal by finally determining that deformation is generated in the vehicle body panel when the output light wavelength and the reflected light wavelength both meet a mismatch condition.

In addition, the control module may transmit the collision detection signal to the airbag system and the door open system through the vehicle network.

In addition, the control module stores the distance in which the optical fiber grating is installed, the number of gratings of the optical fiber grating, the grating spacing in the longitudinal direction from the input terminal of the optical fiber, the reference incident light, reference reflected light and reference output according to the installation conditions of the optical fiber grating The light can be set as a threshold to detect deformation based on this.

On the other hand, the airbag system of a vehicle according to an aspect of the present invention, the vehicle body panel is formed of a composite material is integrally implanted optical fiber therein; An optical fiber lattice sensor unit configured to input incident light into the optical fiber implanted in the vehicle body panel and generate a collision detection signal when a change in the output light output through the optical fiber grating is detected; An ECU (Electronic Control Unit) for operating an airbag by receiving the collision detection signal generated by the optical fiber grating sensor unit according to the deformation of the vehicle body panel during an external collision; And an airbag operation module for inflating the airbag by injecting a high-pressure gas generated instantaneously according to the airbag operation signal applied from the ECU.

The optical fiber grid sensor unit may include: a light source input module configured to convert electrical energy into a laser light source and input the incident light of the optical fiber implanted in the vehicle body panel; An output light receiving module configured to receive output light passing through the optical fiber grating in the optical fiber and detect an output light wavelength; And a control module configured to generate a collision detection signal when it is determined that a deformation occurs due to a mismatch between the detected output light wavelengths and a reference output light within an allowable threshold range.

Here, the optical fiber grating sensor unit is coupled to the input terminal of the optical fiber is incident to the light source received from the light source input module, the coupler for branching and outputting the reflected light reflected by the optical fiber grid; And a reflected light receiving module detecting the reflected light wavelength according to the lattice spacing of the optical fiber grating when the reflected light is input from the coupler.

In addition, the control module may transmit a collision detection signal to the ECU when it is determined that a deformation occurs due to a mismatch between the reflected light wavelengths detected by the reflected light receiving module and a reference reflected light within an allowable threshold range.

The control module may finally determine that deformation is generated in the vehicle body panel when both the output light wavelength and the reflected light wavelength are inconsistent, and transmit the collision detection signal to the ECU.

In addition, the ECU may collect driving information from various sensors and controllers according to the driving of the vehicle, and may vary the sensitivity of the reference threshold with respect to the reference output light wavelength and the reference reflected light wavelength set in the control module based on the collected driving information. have.

In addition, the ECU collects driving information including vehicle speed, acceleration and deceleration in the longitudinal and transverse directions, accelerator pedal operation signal, brake pedal operation signal, and steering angle, so that the high speed dynamic operation mode, the normal operation mode, and the low speed operation are performed. The driving state of the mild driving mode can be determined.

In addition, the ECU sets the sensitivity higher than the reference value by narrowing the threshold range threshold in the dynamic operation mode to a higher threshold value. Can be set low.

According to an embodiment of the present invention, by implanting an optical fiber grating sensor in the composite material to implement a collision detection vehicle panel that is provided with a collision detection sensing function at the same time as the vehicle structure structure and detects a collision through the deformation, regardless of the collision direction There is an effect that can improve the detection performance.

In addition, by deploying the airbag using the car body collision detection signal measured by the optical fiber grating sensor that is integrally implanted in the car body panel has the effect of reducing the human accident caused by the undeployed air bag in the event of a crash.

In addition, by varying the sensitivity of the collision / deformation determination of the optical fiber grating sensor unit according to the driving state of the vehicle, the deployment of the airbag is promoted in a high speed accident situation,

1 illustrates a vehicle to which a conventional collision detection sensor is applied.
2 is a view illustrating an optical fiber grating sensor unit integrally implanted in each part of a vehicle body panel according to an exemplary embodiment of the present invention.
3 is a block diagram schematically illustrating an airbag system using a collision sensing vehicle body panel according to an exemplary embodiment of the present invention.
4 illustrates a vehicle body panel according to an exemplary embodiment of the present disclosure, FIG. 5 illustrates an enlarged view of portion A, and FIG. 6 illustrates a cross-sectional view taken along line BB.
7 is a conceptual diagram illustrating a collision detection principle of an optical fiber grating sensor unit according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

Throughout the specification, terms such as first or second may be used to describe various components, but the components should not be limited by the terms. The terms are only for the purpose of distinguishing one component from another, for example, without departing from the scope of the rights according to the inventive concept, the first component may be called a second component and similarly The second component may also be referred to as the first component.

Now, a collision detection vehicle body panel and an airbag system using the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view illustrating an optical fiber grating sensor unit integrally implanted in each part of a vehicle body panel according to an exemplary embodiment of the present invention.

3 is a block diagram schematically illustrating an airbag system using a collision sensing vehicle panel according to an exemplary embodiment of the present invention.

2 and 3, an airbag system according to an embodiment of the present invention is formed of a composite material and includes an optical body 110 integrally implanted therein into a body panel 10 and the body panel 10. When the incident light is input to the implanted optical fiber 110 and a change in the output light output through the optical fiber grating is detected, the optical fiber grating sensor unit 10 generates a collision detection signal and the deformation of the vehicle body panel 10 during an external collision. It includes an ECU (Electronic Control Unit) (20) for operating the airbag by receiving the collision detection signal generated by the optical fiber grating sensor unit 100 according to.

The body panel 10 is composed of a composite material according to the trend of high strength and light weight, and the optical fiber is implanted therein.

The body panel 10 may be applied to various parts of the body, such as a door inner, a door outer, an impact beam, a fender, and a bumper beam.

For example, FIG. 4 illustrates a vehicle body panel applied to a door according to an exemplary embodiment of the present invention, FIG. 5 illustrates an enlarged view of portion A, and FIG. 6 illustrates a cross-sectional view taken along line B-B.

4 to 6, the vehicle body panel 10 according to the embodiment of the present invention is laminated molding of a first composite material and a second composite material such as carbon fiber reinforced plastic (CARBON FIBER REINFORCED PLASTICS, CFRP), etc. And the optical fiber 110 for collision / strain detection is implanted (inserted) between the stacked surfaces. In this case, the optical fiber 110 may be implanted in a loop shape along the area of the vehicle body panel 10 as shown in FIG. 4 to enhance collision detection performance for the entire area. Accordingly, the vehicle body panel 10 according to the embodiment of the present invention may be referred to as a "collision detection vehicle body panel" to which the function of the vehicle body structure and the collision sensing sensing function are granted.

The composite material is hardened by impregnating a fiber material in a plastic resin, such as epoxy or plastic, for example, the CFRP is produced by fabricating carbon fiber in the form of a fabric and impregnated in the resin and then laminated and cured in the required shape Can be prepared.

In CFRP, resins have excellent hardness, but are easily broken due to weak tensile strength, and carbon fibers are used in combination with resins and carbon fibers because they have high tensile strength but no bending repulsion.

Components of the optical fiber grating sensor unit 100 connected to the input terminal and the output terminal of the optical fiber 110 implanted in the vehicle body panel 10 may be mounted on one surface of the panel while being disposed on a driving board (PCB substrate).

The optical fiber grating sensor unit 100 includes an optical fiber 110, a light source input module 120, a coupler 130, a reflected light receiving module 140, an output light receiving module 150, a control module 160, and an airbag operating module ( 170).

7 is a conceptual diagram illustrating a collision detection principle of an optical fiber grating sensor unit according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the optical fiber 110 includes a core 111, a cladding 112, and an envelope 113.

The core 111 is made of silica glass to form an optical fiber grating (FBG) therein, and germanium (Ge) is added so that the refractive index is relatively high.

Cladding 112 protects the optical fiber core 111 and has a relatively low refractive index. In this case, the reason why the cladding 112 has a low refractive index is to use the principle of total reflection in which light at a predetermined angle is reflected at the interface when light is advanced from a high refractive index material to a low material.

Therefore, incident light input to the optical fiber 110 is reflected at the interface between the core 111 having a relatively high refractive index and the cladding 112 having a relatively low refractive index and propagated along the optical fiber core 111.

The outer shell 113 is coated on the outermost side of the optical fiber 110 to protect the components.

The light source input module 120 converts electrical energy into a light source such as a laser and inputs the incident light into the optical fiber 110. The laser light source may transmit up to 5W of light through an optical fiber, and the optical fiber 110 may transmit up to about 10 to 20 km through a multimode and single mode.

The coupler 130 is connected to the input terminal of the optical fiber 110 and enters the light source received by the light source input module 120, and branches the reflected light reflected by the optical fiber grating FGB to transfer the reflected light to the reflected light receiving module 140. .

When the reflected light is input from the coupler 130, the reflected light receiving module 140 receives the reflected light according to the grid spacing Λ of the optical fiber grid FGB to detect the reflected light wavelength. In this case, since the reflected peak wavelength is determined by the lattice spacing Λ of the optical fiber grid FGB, the optical fiber grid FGB is deformed or the optical fiber 110 is deformed (damaged) due to external impact. When the wavelength is changed compared to the reference reflected light can be detected.

The output light receiving module 150 is connected to the output terminal of the optical fiber 110 to receive the output light passing through the optical fiber grid (FGB) to detect the output light wavelength. At this time, the output light wavelength is detected the remaining output wavelength from the reflected light is removed by the lattice spacing (Λ) of the optical fiber grid (FGB) from the incident light, the optical fiber grid (FGB) is deformed due to external impact or the optical fiber 110 When is modified (damaged), the modified wavelength compared to the reference output light can be detected.

The control module 160 controls the overall operation for detecting the collision / deformation of the optical fiber grating sensor unit 100 and stores data and a processor necessary for this.

The control module 160 stores the distance, the number of grids, and the grid spacing in which the optical fiber grids FGB are installed in the longitudinal direction from the input terminal of the optical fiber 110. In addition, the reference incident light, the reference reflected light and the reference output light according to the installation conditions of the optical fiber grating (FGB) may be set as a threshold value, and based on this, collision / deformation using the optical fiber grating sensor unit 100 may be detected.

The control module 160 may transmit the collision detection signal to various control systems such as an airbag system and a door open system through vehicle communication.

On the other hand, the condition that the control module 160 detects the collision / deformation may be set variously as follows.

For example, the control module 160 compares the output light wavelength detected by the output light receiving module 150 with the reference output light and generates a collision detection signal when it is determined that a deformation occurs due to a mismatch within the allowable threshold range. Transfer to ECU 20 via vehicle network (eg CAN). In this case, the control module 160 may transmit the collision detection signal with comparison information between the vehicle body panel identification information (ID) provided with the optical fiber grating sensor unit 100 and the output light wavelength.

In addition, the control module 160 generates a collision detection signal when it is determined that a deformation occurs due to a mismatch between the reflected light wavelengths detected by the reflected light receiving module 140 and the reference reflected light within an allowable threshold range, and generates a collision detection signal. E.g., CAN) to the ECU 20. In this case, the control module 160 may transmit the collision detection signal by carrying the comparison information between the vehicle body panel ID and the reflected light wavelength on which the optical fiber grating sensor unit 100 is installed.

In addition, the control module 160 generates a collision detection signal by finally determining that deformation has occurred in the vehicle panel when the output light wavelength and the reflected light wavelength both meet an inconsistent AND condition, and generate the collision detection signal. Through the ECU 20 can be delivered.

The airbag operation module 170 injects high-pressure gas generated instantaneously according to an airbag operation signal applied due to collision / strain detection of the optical fiber grating sensor unit 100 to deploy an airbag.

The airbag operation module 170 may receive an airbag operation signal from the ECU 20 or an airbag operation signal applied from the ECU 20 through the control module 160.

The ECU 20 is one computing device that controls the overall operation of operating the airbag using the detection signal of the optical fiber grating sensor unit 100 according to the embodiment of the present invention.

The ECU 20 stores and executes programs and data for controlling the collision detection sensor 100 and the airbag operation module 170.

The ECU 20 collects driving information from various sensors and controllers according to driving of the vehicle, and sets the reference output light wavelength and the reference reflected light wavelength set in the control module 160 of the optical fiber grating sensor unit 100 based on the collected driving information. Sensitivity of the reference threshold for the variable can be set.

For example, the ECU 20 collects driving information such as vehicle speed, acceleration and deceleration in the longitudinal and transverse directions, an accelerator pedal operation signal APS, a brake pedal operation signal BPS, and a steering angle, thereby providing a high speed dynamic operation mode. And the driving state of the low speed mild driving mode and the normal driving mode.

The ECU 20 sets the sensitivity higher by narrowing the allowable threshold range (margin) in the high speed dynamic operation mode than the reference, and variably sets the allowed threshold range wider than the reference in the low speed mild operation mode. Can be. For example, in the high-speed dynamic driving mode in which the acceleration / deceleration changes suddenly or the steering angle changes suddenly while the vehicle is driving at a higher speed than the predetermined vehicle speed, the risk of human accident is high. Therefore, the threshold ranges for the reference output light and the reflected light are limited. By setting the sensitivity higher than the standard, the deployment probability of the airbag can be increased. On the contrary, in the mild driving mode in which the vehicle is in a low speed and gentle driving state, the risk of human accident is relatively low, so the airbag can be prevented from being unnecessarily deployed by increasing the threshold range and setting the sensitivity lower than the reference.

As described above, according to an embodiment of the present invention, by implanting an optical fiber grating sensor in a composite material, the collision direction is realized by implementing a collision detection vehicle panel that is provided with a collision sensing function at the same time as a vehicle structure structure and detecting a collision through its deformation. Regardless of this, there is an effect that can improve the detection performance.

In addition, by deploying the airbag using the vehicle body deformation / collision detection signal measured from the optical fiber grating sensor unit integrally implanted in the vehicle panel, it is possible to prevent the occurrence of a human accident due to undeployment of the airbag in the event of an accident.

In addition, by varying the sensitivity of the collision / deformation determination of the optical fiber grating sensor unit in accordance with the driving state of the vehicle, it is possible to promote the deployment of the airbag in a high speed accident situation, and to prevent the airbag from being unnecessarily deployed in a low speed minor accident.

An embodiment of the present invention is not implemented only through the above-described apparatus and / or method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded, and the like. In addition, such an implementation may be easily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

10: body panel 20: ECU
100: optical fiber grating sensor unit 110: optical fiber
111: core 112: cladding
113: jacket FBG: optical fiber grating
120: light source input module 130: coupler
140: reflected light receiving module 150: output light receiving module
160: control module 170: airbag operation module

Claims (18)

A body panel formed of a composite material and having an optical fiber integrated therein;
A light source input module for converting electrical energy into a laser light source and inputting the incident light of the optical fiber implanted in the vehicle body panel;
An output light receiving module configured to receive output light passing through the optical fiber grating in the optical fiber and detect an output light wavelength; And
A control module configured to generate a collision detection signal when it is determined that a deformation occurs due to a mismatch between the detected output light wavelengths and a reference output light within a permitted threshold range;
Collision detection body panel comprising a. The method of claim 1,
The body panel
A collision sensing body panel in which the optical fiber is implanted between lamination surfaces of a composite material made of carbon fiber reinforced plastic. The method of claim 1,
The optical fiber is
Collision detection body panel is implanted in a loop form along the area of the body panel. The method of claim 1,
The optical fiber is
A core made of silica glass to form the optical fiber grid therein and to which germanium (Ge) is added to improve refractive index;
A cladding that protects the core and is formed to have a relatively low refractive index compared to the core for total reflection of the incident light; And
An outer shell coated on the outermost surface to protect the core and cladding;
Collision detection body panel comprising a. According to claim 1,
The body panel
A collision detection body panel constructed in at least one of a door inner, a door outer, an impact beam, a fender, and a bumper beam. The method according to any one of claims 1 to 5,
A coupler connected to an input terminal of the optical fiber and incident a light source received by the light source input module and branching and reflecting the reflected light reflected by the optical fiber grid; And
A reflected light receiving module detecting a reflected light wavelength according to a lattice spacing of the optical fiber grating when the reflected light is input from the coupler;
A collision detection body panel further comprising. The method of claim 6,
The control module
And a collision detection vehicle panel which generates a collision detection signal when it is determined that a deformation occurs due to a mismatch between a reflected light wavelength detected by the reflected light receiving module and a reference reflected light within a permitted threshold range. The method of claim 7, wherein
The control module
And a collision detection vehicle body panel generating a collision detection signal by finally determining that deformation occurs in the vehicle body panel when the output light wavelength and the reflected light wavelength both satisfy a mismatch. The method of claim 6,
The control module
And a collision detection body panel for transmitting the collision detection signal to an airbag system and a door open system through a vehicle network. The method of claim 6,
The control module
The distance between the optical fiber grating, the number of gratings of the optical fiber grating, and the grating spacing in the longitudinal direction from the input end of the optical fiber is stored, and reference incident light and reference output light according to the installation conditions of the optical fiber grating are set as threshold values. A collision detection body panel that detects deformation based on this. A body panel formed of a composite material and having an optical fiber integrated therein;
An optical fiber lattice sensor unit configured to input incident light into the optical fiber implanted in the vehicle body panel and generate a collision detection signal when a change in the output light output through the optical fiber grating is detected;
An ECU (Electronic Control Unit) for operating an airbag by receiving the collision detection signal generated by the optical fiber grating sensor unit according to the deformation of the vehicle body panel during an external collision; And
An airbag operation module configured to deploy an airbag by injecting a high-pressure gas generated instantaneously according to an airbag operation signal applied from the ECU;
Airbag system comprising a. The method of claim 11,
The optical fiber grating sensor unit
A light source input module for converting electrical energy into a laser light source and inputting the incident light of the optical fiber implanted in the vehicle body panel;
An output light receiving module configured to receive output light passing through the optical fiber grating in the optical fiber and detect an output light wavelength; And
A control module configured to generate a collision detection signal when it is determined that a deformation occurs due to a mismatch between the detected output light wavelengths and a reference output light within a permitted threshold range;
Airbag system comprising a. The method of claim 12,
The optical fiber grating sensor unit
A coupler connected to an input terminal of the optical fiber and incident a light source received by the light source input module and branching and reflecting the reflected light reflected by the optical fiber grid; And
A reflected light receiving module detecting a reflected light wavelength according to a lattice spacing of the optical fiber grating when the reflected light is input from the coupler;
Air bag system further comprising a. The method of claim 13,
The control module
And a collision detection signal is transmitted to the ECU when the reflected light wavelength detected by the reflected light receiving module is determined to be inconsistent within the allowable threshold range by comparing with the reflected light. The method of claim 14,
The control module
And when the output light wavelength and the reflected light wavelength both satisfy a condition of disagreement, finally determining that deformation has occurred in the vehicle body panel, and transmitting a collision detection signal to the ECU. The method of claim 14,
The ECU is
Collecting driving information from various sensors and controllers according to the driving of the vehicle, and based on the collected driving information, the airbag system for varying the sensitivity of the reference threshold with respect to the reference output light wavelength and the reference reflected light wavelength set in the control module. The method of claim 16,
The ECU is
It collects driving information including vehicle speed, longitudinal and lateral acceleration and deceleration, accelerator pedal actuation signal, brake pedal actuation signal and steering angle, so that the high speed dynamic mode, normal mode and low speed mode Airbag system to determine driving conditions. The method according to claim 16 or 17,
The ECU is
In the dynamic operation mode, the sensitivity is set higher than the reference value by narrowing the threshold range, and the airbag system sets the sensitivity lower than the reference value by varying the allowed threshold range wider than the reference value in the low speed mild operation mode. .

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