KR101593414B1 - Electronic Type Retractor for Seat Belt - Google Patents

Abstract

An electronic retractor for a seat belt according to the present invention includes: a frame; a spool rotatably provided in the frame to wind or unwind the webbing; a spool provided at one side of the frame and rotated together with rotation of the spool; A link unit that is selectively engaged with the teeth of the flywheel gear to prevent the spool from rotating in a direction in which the webbing is unwound, a sensing assembly that senses predetermined operation information, And an electronic control unit for receiving the sensing result of the sensing assembly and controlling the link unit to engage the flywheel gear when the detection result satisfies predetermined webbing withdrawal prevention conditions.

Description

Electronic Retractor for Seat Belt [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a retractor for a seat belt, and more particularly, to an electronic retractor for a seat belt capable of integrally implementing various functions with a simple structure by electronic driving.

When a person is riding on a vehicle or an apparatus, various safeguards are provided in order to prevent the person aboard from colliding with the vehicle or other object from leaving the vehicle or apparatus.

Typically, a seat belt is used to stably fix the lower abdomen and the chest of a person aboard the vehicle or mechanism using the seat belt. However, the degree of collision with the vehicle or with other objects increases beyond the reference level, so that the seat belt often fails to function, and in such a case, the safety of a person aboard the vehicle or apparatus is deteriorated.

Accordingly, various techniques have been developed so that the seat belt performs its function even when the degree of collision with the vehicle or with other objects is large. Among them, the retractor is a retractor, and the retractor can have various functions such as an automatic locking retractor function, a block-out function, and an emergency locking retractor function.

The above-described automatic locking retractor function is a function of, for example, when the user pulls the webbing by a predetermined length, such as a method of attaching and restraining the infant seat to a vehicle or a seat of the apparatus, .

Further, the block-out function refers to a function that prevents the webbing from being operated according to the need of the user when the inclination of the vehicle body is sensed to allow the webbing to be pulled out only when the vehicle body is inclined by more than a certain angle.

The emergency locking retractor function is a function for preventing the pulling-out of the webbing after the pretensioner is operated as an impact occurs in the vehicle.

However, it is very difficult to implement all of these functions on a single retractor, because the components that can implement such an automatic locking retractor function, a block-out function, and an emergency locking retractor function are different.

And even if all of these functions are implemented on a single retractor, it is natural that the number of parts of the retractor will be greatly increased and the structure will become very complicated, and the manufacturing cost will increase due to an increase in the number of steps for manufacturing . In addition, as the number of parts increases, interference, friction, noise, etc. between the parts will also be accompanied.

Therefore, a method for solving such problems is required.

Korean Patent No. 10-0801603

SUMMARY OF THE INVENTION The present invention is conceived to solve the problems of the prior art described above, and it is an object of the present invention to provide a retractor for a seat belt that is simple in structure and easy to manufacture while implementing various functions as one retractor.

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.

According to an aspect of the present invention, there is provided an electronic retractor for a seat belt, comprising: a frame; a spool rotatably provided in the frame to wind or unwind the webbing; A link unit that is selectively engaged with the teeth of the flywheel gear to prevent the spool from rotating in a direction in which the webbing is unwound, And an electronic control unit for receiving the detection result of the sensing assembly and the electronic control unit controlling the link unit to engage the flywheel gear when the detection result satisfies the predetermined webbing withdrawal prevention condition.

The sensing assembly is rotated together with the rotation of the spool. The sensing assembly includes a rotation unit having a magnet at a predetermined position on an outer circumference thereof, and a sensing unit disposed at a circumference of the rotation unit to detect rotation information of the rotation unit using a magnetic field of the magnet. And a rotation measuring unit for measuring the rotation of the rotating shaft.

Also, the rotation measuring unit may have a facing surface opposed to a part of the outer circumferential surface of the rotating unit, and a hall sensor may be provided inside the facing surface.

The electronic control unit may determine that the webbing withdrawal prevention condition is satisfied when the rotation speed of the rotation unit is equal to or greater than a predetermined reference rotation speed.

Further, the electronic control unit may determine the amount of the webbing taken out through the rotation speed of the rotating portion, and determine that the webbing withdrawal prevention condition is satisfied when the webbing is drawn out over the predetermined first length.

The electronic control unit may control the link unit to be separated from the flywheel gear when the webbing is pulled out again after the webbing is pulled out by the first length and drawn out by a predetermined second length.

Further, the sensing assembly may further include a sheet displacement measuring section for measuring a displacement of the vehicle seat, and the electronic control unit may recalibrate the first length and the second length to correspond to the displacement of the seat.

The sensing assembly may include an acceleration measuring unit for measuring acceleration information and tilt information of the vehicle.

Further, the electronic control unit may determine that the webbing withdrawal prevention condition is satisfied when the acceleration information of the vehicle is equal to or greater than a predetermined reference acceleration.

The electronic control unit may determine that the webbing withdrawal prevention condition is satisfied when the tilt information of the vehicle is equal to or greater than a predetermined reference slope.

Further, the sensing assembly may further include a sheet displacement measuring section for measuring a displacement of the vehicle seat, and the electronic control unit may recalibrate the reference slope to correspond to the displacement of the seat.

And wherein the sensing assembly further includes a sheet displacement measuring section for measuring a displacement of the vehicle seat, and the electronic control unit is configured to determine whether the displacement of the seat is equal to or greater than a reference displacement, It can be prevented from being caught by the wheel gear.

And a pretensioner provided on the other side of the frame, wherein the electronic control unit can determine that the webbing withdrawal prevention condition is satisfied when the pretensioner is completed.

The link unit may include a latching portion including a latching protrusion and a driving portion for driving the latching portion so that the latching protrusion is selectively hooked to the teeth of the flywheel gear.

The driving unit may include a moving member that is connected to the engaging part by a rotating shaft and is linearly movable to rotate the engaging part in accordance with the linear movement, And may include a driving module for moving the linear motion.

The driving unit may be formed in the form of a solenoid.

In order to solve the above-mentioned problems, the electronic retractor for a seat belt of the present invention has the following effects.

First, there is an advantage that various functions such as an automatic locking retractor function, a block-out function, and an emergency locking retractor function can be implemented as one retractor.

Second, it has a simple structure, it can lighten the weight, minimize the failure rate, and is easy to maintain.

Third, since the structure is simple and the number of processes is minimized, it is easy to manufacture, and the manufacturing cost can be reduced.

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 perspective view showing the entire structure of an electronic retractor for a seat belt according to an embodiment of the present invention;
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electronic retractor for a seat belt,
3 is a front view showing an internal structure of an electronic retractor for a seat belt according to an embodiment of the present invention;
FIG. 4 is a perspective view of an electronic retractor for a seat belt according to an embodiment of the present invention, showing a state of a rotating part and a rotation measuring part; FIG.
FIG. 5 is a perspective view of an electronic retractor for a seat belt according to an embodiment of the present invention, in which the rotation measuring unit senses rotation information of the rotation unit; FIG.
6 is a front view showing an appearance of a link unit in an electronic retractor for a seat belt according to an embodiment of the present invention;
FIG. 7 is a front view showing an electronic retractor for a seat belt according to an embodiment of the present invention, in which a locking protrusion is caught by teeth of a flywheel gear by driving a link unit; FIG.
8 is a front view showing a state of an acceleration measuring part in an electronic retractor for a seat belt according to an embodiment of the present invention;
FIG. 9 is a plan view of an electronic retractor for a seat belt according to an embodiment of the present invention, showing a predetermined outgoing section of the webbing; FIG.
10 is a view showing an operation of the electronic retractor for a seat belt according to an embodiment of the present invention in a state in which the webbing is drawn out below the first length;
11 is a view showing the operation of the electronic retractor for a seat belt according to the embodiment of the present invention in a state in which the webbing is drawn out beyond the first length; And
FIG. 12 is a plan view showing a state in which a predetermined outgoing section of a webbing is re-adjusted according to a displacement of a vehicle seat in an electronic retractor for a seat belt according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

FIG. 1 is a perspective view showing an entire structure of an electronic retractor for a seat belt according to an embodiment of the present invention, and FIG. 2 is a view showing a connection structure between respective components of the electronic retractor for a seat belt according to an embodiment of the present invention Fig.

1 and 2, an electronic retractor for a seat belt according to an embodiment of the present invention includes a frame 10 and a frame 10 rotatably provided on the frame 10 to receive a webbing (not shown) And a spool (20) formed to be loosened or loosened.

Also, a cover 180 is provided on one side of the frame 10, and the cover 180 is formed to have a receiving space therein. In the accommodation space, various components are accommodated.

More specifically, the cover 180 includes a flywheel gear 110, link units 150 and 160, sensing assemblies 120, 130 and 140, and an electronic control unit 134.

The flywheel gear 110 is provided at one side of the frame 10 and is rotated together with the rotation of the spool 20, and a unidirectional tooth 112 is formed along the outer circumferential surface.

That is, the flywheel gear 110 is rotated together with the spool 20 when the webbing is drawn and drawn. In this embodiment, the flywheel gear 110 extends the rotation shaft of the spool 20 The center of the pawl 22 protruding from one side of the spool 20 is connected to the center of the spool 20.

The link units 150 and 160 are provided to selectively engage the teeth 112 of the flywheel gear 110 to prevent the spool 20 from rotating in a direction in which the webbing is unwound.

That is, the link units 150 and 160 are not caught by the teeth 112 of the flywheel gear 110 in a general situation, and in a specific situation, the gears 112 of the flywheel gear 110 So as to prevent the rotation of the flywheel gear 110, thereby preventing the rotation of the spool 20 and the pulling-out of the webbing.

In this embodiment, the link units 150 and 160 include a latch 160 and a driver 150, and details thereof will be described later.

The sensing assemblies 120, 130 and 140 are components for sensing predetermined operation information. The operation information may be at least one of various information such as driving information of each component of the seat belt electronic retractor according to the embodiment of the present invention, driving information of the vehicle, driving information of each part of the vehicle, The assemblies 120, 130, and 140 may include various sensor portions that sense such operation information.

In this embodiment, the sensing assembly 120, 130, 140 includes a rotation unit 120, a rotation measurement unit 130, and an acceleration measurement unit 140. And a sheet displacement measuring unit (not shown). The details of these will be described later.

The electronic control unit 130 receives the detection result of the sensing assembly 120, 130, 140 and controls the link unit 150, 160 to detect the webbing withdrawal prevention condition, And is engaged with the wheel gear 110.

That is, the predetermined webbing withdrawal prevention condition is input to the memory of the electronic control unit 130, and if the webbing withdrawal prevention condition is satisfied by receiving the operation information collected by the sensing assemblies 120, 130 and 140 . When the operation information satisfies the webbing withdrawal prevention condition, the link unit (150, 160) is controlled to engage the flywheel gear (110) to prevent the webbing from being pulled out.

Also, the electronic control unit 130 may be provided at various positions, and in the present embodiment, the electronic control unit 130 is provided in the rotation measuring unit 130. However, it should be understood that the position of the electronic control unit 130 is not limited by the present embodiment, as one embodiment.

Meanwhile, in the present embodiment, a pretensioner 50 is provided on the other side of the frame 10, and the structure and the role of the pretensioner 50 are obvious to those skilled in the art, so a detailed description thereof will be omitted.

3 is a front view showing an internal structure of an electronic retractor for a seat belt according to an embodiment of the present invention.

3, the electronic retractor for a seat belt according to the embodiment of the present invention is provided with a flywheel gear 110 on one side of a frame 10, and on the center side of the flywheel gear 110, A rotation unit 120 is provided. A rotation measurement unit 130 is provided on one side of the rotation unit 120 and an acceleration measurement unit 140 is provided on the outer side of the rotation measurement unit 130.

In addition, link units 150 and 160 are provided adjacent to the lower portion of the flywheel gear 110.

Hereinafter, the respective components will be described in more detail, and the collecting process of the various pieces of operation information and the conditions for preventing the webbing pull-out will be described together.

4 is a perspective view showing the state of the rotation unit 120 and the rotation measuring unit 130 in the electronic retractor for a seat belt according to the embodiment of the present invention, 1 is a perspective view showing a state in which the rotation measuring unit 130 senses rotation information of the rotation unit 120 in an electronic retractor for a belt.

4 and 5, the sensing assembly of the electronic retractor for a seat belt according to an embodiment of the present invention includes a rotation unit 120 and a rotation measurement unit 130.

The rotation unit 120 is rotated together with the rotation of the spool 20 (see FIG. 2), and the magnet 122 is provided at a predetermined position on the outer circumferential surface. That is, the rotation part 120 is rotated by the same rotation axis together with the spool 20 and the flywheel gear 110 (see FIG. 2), and corresponds to 1: 1 rotation of the spool 20 in the present embodiment, 20) makes one revolution, the rotation unit 120 also makes one rotation.

A magnet 122 is provided on an outer circumferential surface of the rotation unit 120, and the magnet 122 may be a magnetic member of various types forming a magnetic field. In the present embodiment, the magnet 122 is formed as an electromagnet. Since the magnet 122 is provided on the outer circumferential surface of the rotation unit 120, the magnet 122 is rotated in the circumferential direction of the rotation unit 120 according to the rotation of the rotation unit 120.

The rotation measuring unit 130 is provided at one side of the rotation unit 120 and senses the rotation information of the rotation unit 120 using the magnetic field of the magnet 122.

The rotation measuring unit 130 has a facing surface 132 opposed to a part of the outer circumferential surface of the rotation unit 120 and a hall sensor is provided inside the facing surface 132. [ Accordingly, when the rotation unit 120 rotates and the magnet 122 is adjacent to the opposing surface 132, the rotation measurement unit 130 measures the rotation speed, the rotation direction, the rotation angle, and the like of the rotation unit 120 Various rotation information can be detected. Such rotation information may be included as one of the above-described operation information.

Since the rotation unit 120 corresponds to the rotation of the spool 20 at a ratio of 1: 1 as described above, the rotation information of the rotation unit 120, measured by the rotation measurement unit 130, And can be matched with rotation information.

The rotation information of the rotation unit 120 is transmitted to the electronic control unit 134, and the electronic control unit 134 compares the collected rotation information with the webbing withdrawal prevention condition.

Specifically, in the present embodiment, when the rotation speed of the rotation unit 120 is equal to or greater than a predetermined reference rotation speed, the electronic control unit 134 regards that the user suddenly receives an external force and satisfies the webbing withdrawal prevention condition . Therefore, in such a case, the electronic control unit 134 drives the link unit 150, 160 (see Fig. 2) described above, so that the flywheel gear 110 stops rotating in the direction in which the webbing is pulled out.

On the other hand, if the amount of the webbing taken out is determined by the number of revolutions of the rotation unit 120 by using the rotation information, and the webbing is withdrawn more than the predetermined first length, And may drive the link units 150 and 160 according to the determination. This corresponds to the automatic locking retractor function, which will be described later.

FIG. 6 is a front view showing a state of link units 150 and 160 in an electronic retractor for a seat belt according to an embodiment of the present invention, and FIG. 7 is a front view 1 is a front view showing a state in which the engagement protrusion 162 is caught by the teeth 112 of the flywheel gear 110 by driving the link units 150 and 160 in the tractor.

6 and 7, the link units 150 and 160 include a latch 160 and a driver 150 in this embodiment.

More specifically, the latching unit 160 includes a latching protrusion 162 which is engaged with the teeth 112 of the flywheel gear 110, and the driving unit 150 drives the latching unit 160, (162) is selectively engaged with the teeth (112) of the flywheel gear (110). At this time, the driving method of the driving unit 150 and the locking unit 160 may be variously implemented.

In this embodiment, the latching portion 160 is formed to rotate about the fixed axis. 2) or the frame 10 (see FIG. 2), and the like. The fixed shaft hole 164 is formed in the locking part 160, And can be formed at various positions.

The driving unit 150 includes a moving member 152 connected to the locking unit 160 by a rotation shaft 170 and linearly movable to rotate the locking unit 160 when the locking unit 160 linearly moves, And a driving module 151 for moving the moving member 152 in a linear manner.

At this time, the driving unit 150 may be formed in various shapes such as an actuator, but in the present embodiment, it is formed in a solenoid shape. That is, in this embodiment, the driving module 151 linearly moves the moving member 152, so that the engaging portion 160 is rotated with respect to the fixed shaft so that the engaging protrusion 162 engages with the flywheel gear 110).

As described above, the driving unit 150 is controlled by the electronic control unit 134 (see FIG. 4) when the operation information satisfies the webbing withdrawal prevention condition.

8 is a front view showing the state of the acceleration measuring unit 140 in the electronic retractor for a seat belt according to the embodiment of the present invention.

As shown in FIG. 8, the sensing assembly of the electronic retractor for a seat belt according to an embodiment of the present invention includes an acceleration measuring unit 140.

The acceleration measuring unit 140 is an element for measuring acceleration information and tilt information of the vehicle, and may include an acceleration sensor capable of sensing the acceleration information and the tilt information.

The electronic control unit 134 determines that the webbing withdrawal prevention condition is satisfied when the acceleration information of the vehicle is equal to or greater than a preset reference acceleration or when the inclination information of the vehicle is equal to or greater than a predetermined reference slope, The link unit 150, 160 (see Fig. 6) described above can be driven.

At this time, driving of the link units 150 and 160 according to the inclination information of the vehicle corresponds to a block-out function, and the present invention has an advantage that a block-out function can be realized with such a simple structure.

Fig. 9 is a plan view showing a draw-out section of a predetermined webbing 30 in an electronic retractor for a seat belt according to an embodiment of the present invention.

As described above, in the present embodiment, it is possible to determine the amount of webbing 30 taken out by using the rotation information of the rotation unit 120 (see FIG. 5), thereby realizing an automatic locking retractor function.

The automatic locking retractor function refers to a function that allows the webbing 30 to be pulled in only when the user pulls the webbing 30 by a predetermined length.

Therefore, in the present embodiment, when the webbing 30 is drawn out by the predetermined length r1 + r2, it can be determined that the webbing withdrawal prevention condition is satisfied.

10, when the webbing 30 is pulled out, the rotation measuring unit 130 senses the rotation speed of the rotation unit 120, and detects the rotation speed of the webbing 30 according to the rotation speed, . When the webbing 30 is drawn out to a position less than the first length r1 + r2, the link units 150 and 160 are not operated and the webbing 30 can be continuously drawn.

11, when the webbing 30 is pulled out beyond the first length r1 + r2, the electronic control unit 134 determines that the webbing withdrawal prevention condition is satisfied, (150, 160) to prevent the webbing (30) from being pulled out.

At this time, since the tooth 112 of the flywheel gear 110 is formed in one direction, the webbing 30 can be pulled in. The electronic control unit 134 controls the link unit 150 and 160 so that the webbing 30 is pulled out by a predetermined second length r2 so that the flywheel 30 110).

As described above, the present invention can realize the function of the automatic locking retractor even by a simple structure.

12 is a plan view showing a state in which the outgoing section of the predetermined webbing 30 is re-adjusted according to the displacement of the vehicle seat in the electronic retractor for a seat belt according to the embodiment of the present invention.

In the case of the present embodiment, the sensing assembly may further include a sheet displacement measuring unit for measuring a displacement of the vehicle seat. 12, when the seat of the user is moved forward or backward, that is, in the A or B direction on the basis of the retractor 100, the seat displacement measuring unit senses this and controls the electronic control unit 134 .

Then, the electronic control unit 134 recalculates the first length (r1 + r2, see Fig. 9) and the second length (r2, see Fig. 9) of the predetermined webbing 30 to correspond to the displacement of the seat , It can be reflected in the automatic locking retractor function.

That is, when the displacement of the seat is changed, the pull-out length of the webbing 30 has a certain error with respect to the first length r1 + r2 and the second length r2 of the predetermined webbing 30, Element.

Therefore, the electronic control unit 134 recalculates the first length r1 + r2 (see Fig. 9) and the second length r2 (see Fig. 9) of the webbing 30 according to the amount of movement of the seat, It is possible to have a setting value suitable for the position of the seat.

And the starting point of the second length r2 of the webbing 30 in the recalibration process can be selected in the correction region r4 of the entire length of the webbing 30. [ That is, the start point of the second length r2 is added and rewritten in the correction region r4, and both side regions of the correction region r4 are set to the fixed regions r3 and r5 which are not affected by the re-correction can do.

In addition, the electronic control unit can recalibrate so that the reference slope described above also corresponds to the displacement of the seat. That is, the reference slope may be increased or decreased according to the amount of movement of the seat, so that it can be used for judging the condition for preventing the webbing pull-out.

6) is caught by the flywheel gear 110 (see FIG. 2) until the seat is restored, when the displacement of the seat is changed by more than a reference displacement Can be prevented.

The reason for doing this is that if the webbing is not pulled out when the displacement of the seat is changed, it is difficult to restore the seat.

On the other hand, in the present embodiment, an emergency locking retractor function for preventing the webbing from being pulled out after the pretensioner 50 (see FIG.

That is, when the pretensioner 50 is operated, the electronic control unit 134 (see FIG. 4) may determine that the webbing withdrawal prevention condition is satisfied and drive the link units 150 and 160 (see FIG. 6) Accordingly, the emergency locking retractor function can be easily implemented.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

10: frame 20: spool
22: pole 50: pretensioner
110: flywheel gear 112: toothed wheel
120: rotation part 122: magnet
130: rotation measuring unit 132: facing surface
134: Electronic control unit 140: Acceleration measuring unit
150: driving part 160:
180: cover

Claims (16)

frame;
A spool rotatably provided in the frame so that the webbing is wound or unwound;
A flywheel gear provided at one side of the frame and rotated together with the rotation of the spool, the flywheel gear having unidirectional teeth formed along an outer circumferential surface thereof;
A link unit provided to selectively engage the teeth of the flywheel gear to prevent the spool from rotating in a direction in which the webbing is unwound;
A sensing assembly sensing predetermined motion information; And
An electronic control unit that receives the detection result of the sensing assembly and controls the link unit to engage the flywheel gear when the detection result satisfies a predetermined webbing withdrawal prevention condition;
/ RTI >
The sensing assembly includes:
A rotating part rotatable together with a rotation number of the spool so as to correspond to each other at a ratio of 1: 1 and having a magnet at a predetermined position on an outer circumferential surface thereof; And
A rotation measuring unit provided at a circumferential side of the rotation unit to sense rotation information including the rotation number of the rotation unit using the magnetic field of the magnet;
/ RTI >
Wherein the electronic control unit comprises:
Determines the amount of the webbing to be drawn out through the rotation speed of the rotating portion,
Wherein the webbing pull-out preventing condition is satisfied when the webbing is pulled out over a predetermined first length, and the webbing is pulled over more than the predetermined first length, Electronic retractor. delete The method according to claim 1,
The rotation measuring unit may include:
And a hall sensor is provided on the inside of the facing surface. The seat belt retractor according to claim 1, The method according to claim 1,
Wherein the electronic control unit comprises:
And determines that the webbing withdrawal prevention condition is satisfied when the rotation speed of the rotation portion is equal to or greater than a predetermined reference rotation speed. delete The method according to claim 1,
Wherein the electronic control unit comprises:
And when the webbing is pulled out again after the webbing is pulled out by the first length and is pulled out by a predetermined second length, the link unit is released and released from the flywheel gear. The method according to claim 6,
The sensing assembly includes:
Further comprising a seat displacement measuring section for measuring a displacement of the vehicle seat,
Wherein the electronic control unit comprises:
Wherein the first length and the second length are adjusted so as to correspond to the displacement of the seat. The method according to claim 1,
The sensing assembly includes:
And an acceleration measuring section for measuring acceleration information and tilt information of the vehicle. 9. The method of claim 8,
Wherein the electronic control unit comprises:
And judges that the webbing withdrawal prevention condition is satisfied when the acceleration information of the vehicle is equal to or greater than a predetermined reference acceleration. 9. The method of claim 8,
Wherein the electronic control unit comprises:
And judges that the webbing withdrawal prevention condition is satisfied when the slope information of the vehicle is equal to or greater than a predetermined reference slope. 11. The method of claim 10,
The sensing assembly includes:
Further comprising a seat displacement measuring section for measuring a displacement of the vehicle seat,
Wherein the electronic control unit comprises:
And the reference inclination is recalculated so as to correspond to the displacement of the seat. The method according to claim 1,
The sensing assembly includes:
Further comprising a seat displacement measuring section for measuring a displacement of the vehicle seat,
Wherein the electronic control unit comprises:
And prevents the link unit from being caught by the flywheel gear until the seat is restored when the displacement of the seat is changed by more than a reference displacement. The method according to claim 1,
Further comprising a pretensioner provided on the other side of the frame,
Wherein the electronic control unit comprises:
And determines that the webbing withdrawal prevention condition is satisfied when the pretensioner is completed. The method according to claim 1,
The link unit includes:
A latching portion including a latching protrusion; And
A drive unit for driving the engaging part to selectively engage the engaging projection with the teeth of the flywheel gear;
And an electronic retractor for a seat belt. 15. The method of claim 14,
Wherein the engaging portion is formed to rotate with respect to the fixed shaft,
The driving unit includes:
A moving member connected to the latching portion by a rotation axis and formed to be linearly movable and rotating the latching portion in accordance with the linear movement; And
A driving module for linearly moving the moving member;
And an electronic retractor for a seat belt. 16. The method of claim 15,
Wherein the driving unit is formed in a solenoid shape.

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