JP2007160986A - Vehicular seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular seat belt device capable of ensuring occupant crash protective performance in a head-on collision, and enhancing occupant crash protective performance in a side impact. <P>SOLUTION: The vehicular seat belt device 30 a seat belt 31 for constraining a seated occupant Ma, a motor 43 for a shoulder belt of a pre-tensioner 42 for winding a slacked portion of a shoulder belt part 32 of the seat belt in an emergency, a motor 62 for a lap belt of the pre-tensioner 61 for winding the slacked portion of a lap belt part 33 of the seat belt in an emergency, and a control unit 101 for controlling the drive of these motors. When detecting an impact from the front side on a vehicle 10, the control unit controls the drive of both motors 43, 62 so as to wind the slacked portions of the belt parts 32, 33. When detecting the impact from the side on the vehicle, only the motor for the shoulder belt is drive-controlled so as to wind the slacked portion of the shoulder belt part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improved technique for a vehicle seat belt device in which an occupant seated on a vehicle seat is restrained by a seat belt.

In recent years, in order to protect a vehicle occupant, a vehicle equipped with a seat belt has been developed. 2. Description of the Related Art As a vehicle seat belt device, a configuration in which a loose portion of a seat belt is quickly wound up by a pretensioner when an impact from the front of the vehicle is detected is often used. Furthermore, in such a vehicle seat belt device, from the viewpoint of improving the occupant protection performance, each slack portion (slack portion) of the shoulder belt portion and the lap belt portion of the seat belt is appropriately wound. A technique is known (for example, refer to Patent Document 1).
JP 2001-287622 A

A conventional vehicle seat belt device according to Patent Document 1 will be described with reference to FIG. FIG. 5 is a schematic diagram of a conventional vehicle seat belt apparatus.
The conventional vehicle seat belt device 200 has a three-point support structure in which a seat belt 202 that restrains an occupant seated on a seat 201 is supported at three points of an upper anchor 203, a center anchor 204, and a lower anchor 205. Further, the vehicle seat belt device 200 first winds the slack portion of the shoulder belt portion 206 of the seat belt 202 with the shoulder belt pretensioner 207 of the seat belt 202 when the vehicle collides head-on, and then the lap belt portion 208. The loosened portion is wound up by a lap belt pretensioner 209.

By the way, the conventional vehicle seat belt device 200 winds up the slack portion of the seat belt 202 only when the vehicle collides head-on, and does not consider the case where the vehicle collides side-by-side. On the other hand, in such a vehicle seat belt device 200, even when a side collision occurs, it can be considered that the vehicle seat belt apparatus 200 is operated in the same manner as in the frontal collision.
However, there is room for further improvement in consideration of the case of a side collision from the viewpoint of further improving the passenger protection performance.

  An object of the present invention is to provide a technique capable of ensuring the protection performance of an occupant in the case of a frontal collision of a vehicle and further improving the protection performance of the occupant even in the case of a side collision.

According to the first aspect of the present invention, a seat belt for restraining an occupant seated on a vehicle seat, a shoulder belt motor for a pretensioner that winds a loose portion of the shoulder belt portion of the seat belt in an emergency, and a lap in the seat belt In a vehicle seat belt apparatus including a lap belt motor for a pretensioner that winds a loose portion of a belt portion in an emergency, and a control unit that drives and controls these motors.
When the condition that the impact from the front to the vehicle is detected is satisfied, the control unit controls both the shoulder belt motor and the lap belt motor so as to wind up the slack portions of the shoulder belt portion and the lap belt portion. In addition, when the condition that the impact from the side to the vehicle is detected is satisfied, only the shoulder belt motor is driven and controlled so as to wind up the slack portion of the shoulder belt portion.

  In the invention according to claim 1, when the condition that the impact from the front to the vehicle is detected is satisfied, the upper part of the occupant (shoulder part) is taken up by the seat belt by winding each loose part of the shoulder belt part and the lap belt part. And chest) and the waist can be restrained quickly and reliably. By reliably restricting the forward movement of both the upper body and the waist, it is possible to ensure the occupant protection performance during a frontal collision.

In addition, when the condition that the impact from the side against the vehicle is detected is satisfied, the upper part of the occupant (shoulder or chest) is securely restrained by the shoulder belt part by winding the loose part of the shoulder belt part. Can do.
In this case, since the lap belt motor is maintained in a stopped state, the slack portion of the lap belt portion is only wound by the shoulder belt motor via the shoulder belt portion. For this reason, the slack portion of the lap belt portion is wound up slightly later than the slack portion of the shoulder belt portion. Even when a side collision occurs, the waist of the occupant can move slightly in the vehicle width direction until the winding of the loose portion of the lap belt portion is completed.

  By the way, when the vehicle body (including the door) has an impact absorber in preparation for an impact from the side against the vehicle, the inner wall of the vehicle body is deformed into the vehicle interior due to the occurrence of a side collision. Depending on the amount of deformation, the shock absorber may hit the occupant's waist. At this time, the shock absorber pushes the occupant's waist toward the center of the vehicle width while deforming. By this pushing force, the occupant's lower back can be moved in the vehicle width direction by the looseness of the lap belt.

  Thus, when a side collision occurs, the occupant's protection performance can be further enhanced by the comprehensive action of the impact absorption due to the deformation of the impact absorber and the movement of the occupant's waist. Furthermore, the thickness of the shock absorber can be reduced by the amount that the occupant's waist can move to the center of the vehicle width. In that case, the thickness of the door can be reduced.

  As described above, occupant protection performance in the case of a frontal collision of the vehicle can be ensured, and also in the case of a side collision, the occupant protection performance can be further enhanced.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic view of a vehicle according to the present invention, as seen from the front, broken at a center pillar portion. As shown in FIG. 1, the vehicle 10 is provided with a seat 20 and a vehicle seat belt device 30. The seat 20 includes a seat cushion 21 and a seat back 22 provided on the seat cushion 21 so that the seat cushion 21 can be raised and lowered.

The vehicle seat belt device 30 restrains the occupant Ma seated on the seat 20, for example, the driver Ma seated on the driver seat 20, with the seat belt 31. When not restrained, the seat belt 31 is retracted by the retractor 41 (belt winder 41). ) Is an occupant protection device. The vehicle seat belt device 30 includes, for example, an upper anchor 51 on the upper side of the vehicle body 11, a lower center anchor 52 on the opposite side of the upper anchor 51 with respect to the seat 20, and a lower anchor 53 on the lower side of the upper anchor 51. This is a three-point support structure that is supported at three points.
The center anchor 52 includes a latching mechanism that is attached to the buckle 55 on the vehicle body 11 side with a single touch so that the tongue 56 on the belt 31 side can be removed.

The seat belt 31 includes a shoulder belt portion 32 that restrains one shoulder portion or chest portion of the occupant Ma and a lap belt portion 33 that restrains the waist portion.
The shoulder belt portion 32 is a belt that extends from one end connected to the retractor 41 so as to be rewound and passes through the slit of the upper anchor 51 and slidably passes through the slit of the tongue 56. One end of the lap belt portion 33 is integrally connected to the other end of the shoulder belt portion 32, and the other end is wound around a pretensioner 61 (hereinafter referred to as “lap belt pretensioner 61”) built in the lower anchor 53. It is a belt that can be connected.

  The retractor 41 includes a pretensioner 42 (hereinafter referred to as “shoulder belt pretensioner 42”). The shoulder belt pretensioner 42 is restrained to the shoulder belt portion 32 by a driving torque generated by an electric motor 43 (hereinafter referred to as “shoulder belt motor 43”) in the event of an emergency of the vehicle 10, for example, a collision. This is an electric pretensioner that winds the loose portion of the shoulder belt portion 32 by applying a force.

The lap belt pretensioner 61 restrains the lap belt portion 33 by a driving torque generated by an electric motor 62 (hereinafter referred to as “lap belt motor 62”) in the event of an emergency of the vehicle 10, for example, a collision. This is an electric pretensioner that winds up the loosened portion of the lap belt portion 33 by adding
The motors 43 and 62 are controlled by the control unit 101.

  As is clear from the above description, the vehicle seat belt device 30 winds the seat belt 31 that restrains the occupant Ma seated on the seat 20 of the vehicle 10 and the loose portion of the shoulder belt portion 32 of the seat belt 31 in an emergency. The shoulder belt motor 43 of the pretensioner 42 to be taken, the lap belt motor 62 of the pretensioner 61 to take up the loose portion of the lap belt portion 33 of the seat belt 31 in an emergency, and the control for driving and controlling these motors 43 and 62 Unit 101.

  FIG. 2 is a schematic view of the vehicle according to the present invention as seen from the front side, broken away at the front door portion. As shown in FIG. 2, the door 70 of the vehicle 10 has an impact absorber 75 in preparation for a side impact on the vehicle 10. More specifically, the door 70 includes an outer door outer panel 71, an inner door inner panel 72, and a door trim 73 (interior material 73) provided on the indoor side of the door inner panel 72. It is a typical configuration.

  Such a door 70 is provided with an impact absorber 75 inside the door trim 73 as shown in the figure, or on the vehicle compartment 12 side with respect to the door trim 73, so that the occupant against the impact from the side with respect to the vehicle 10. Ma can be protected. The shock absorber 75 is made of an elastic material such as polyurethane resin.

  Further, as shown in FIG. 2, the vehicle 10 includes (1) a front protection airbag device 80 that protects the front of the upper body of the occupant Ma when an impact from the front of the vehicle 10 is detected, and (2) When a side impact on the vehicle 10 is detected, a side protection airbag device 90 that protects the side of the upper body of the occupant Ma is installed.

  The front protection airbag device 80 includes, for example, an inflator 81 and a front airbag 82 disposed in front of the vehicle body 11 such as a steering handle and an instrument panel, and the front airbag 82 is generated by gas generated by the inflator 81 at the time of a collision or the like. It is the general structure which expands and expands.

  The side protection airbag device 90 includes an inflator 91 and a side curtain airbag 92 arranged at the roof corner portion of the vehicle body 11, and inflates the side curtain airbag 92 by gas generated by the inflator 91 at the time of a collision, This is a general configuration that is deployed in a curtain shape along the side glass 74 on the vehicle compartment 12 side.

FIG. 3 is a circuit diagram of the vehicle occupant protection system according to the present invention. The overall circuit configuration of the vehicle seat belt device 30, the front protection airbag device 80, and the side protection airbag device 90, that is, 2 shows a circuit configuration of a vehicle occupant protection system 100.
As shown in FIG. 3, in the vehicle occupant protection system 100, the control unit 101 that receives various detection signals detected by the detection unit group 110 controls (1) the shoulder belt motor 43 via the driver circuit 102. (2) The lap belt motor 62 is controlled via the driver circuit 103, (3) the inflator 81 for the front airbag 82 is controlled, and (4) the inflator 91 for the side curtain airbag 92 is controlled. It is the composition made.

  The detection unit group 110 includes various detection means such as a front collision acceleration sensor 111, a side collision acceleration sensor 112, a rollover detection sensor 113, a shoulder belt belt tension sensor 114, and a lap belt belt tension sensor 115.

  The front collision acceleration sensor 111 is detection means for detecting acceleration applied from the front to the vehicle 10 (see FIG. 1). The side collision acceleration sensor 112 is detection means for detecting acceleration applied to the vehicle 10 from the side. The rollover detection sensor 113 is detection means for detecting the rollover or rollover possibility of the vehicle 10. For example, when the detection values detected by a yaw rate sensor and a roll angle sensor (not shown) are excessive, A rollover detection signal is generated by determining that there is a possibility of rollover due to an extreme driving accompanied by a change in posture.

  The belt tension sensor 114 for the shoulder belt is detection means for detecting the belt tension applied to the shoulder belt portion 32 (see FIG. 1). The belt tension sensor 115 for the lap belt is detection means for detecting the belt tension applied to the lap belt portion 33 (see FIG. 1). These belt tension sensors 114 and 115 include, for example, a strain sensor embedded in the seat belt 31 or a current sensor that detects a current value flowing through each of the motors 43 and 62.

  Next, a control flow when the control unit 101 shown in FIG. 3 is a microcomputer will be described with reference to FIG. In this control flow, for example, the control is started when an ignition switch (not shown) is turned on, and the control is ended when the ignition switch is turned off. In the figure, STxx indicates a step number. Step numbers that are not specifically described proceed in numerical order. Hereinafter, a description will be given with reference to FIGS.

FIG. 4 is a control flowchart of the control unit according to the present invention.
ST01: The shoulder belt motor 43 and the lap belt motor 62 are stopped or kept in a stopped state.
ST02: The detection signals of the various detection units 111 to 115 are read.

  ST03: Check whether a frontal collision or rollover has occurred. If YES, the process proceeds to ST04, and if NO, the process proceeds to ST11. For example, when the detection value detected by the frontal collision acceleration sensor 111 reaches a predetermined constant frontal collision reference value, the condition that an impact from the front to the vehicle 10 is detected is satisfied. It becomes the judgment. Further, when the detected value detected by the rollover detection sensor 113 reaches a preset predetermined rollover reference value, the condition that the vehicle 10 may rollover or rollover is satisfied. Judgment.

ST04: The shoulder belt motor 43 is started. As a result, the shoulder belt pretensioner 42 starts winding the loose portion of the shoulder belt portion 32.
ST05: A timer built in the control unit 101 is started.
ST06: Check whether the count time of the timer has passed a predetermined reference time, that is, whether a certain fixed time (for example, 5 to 20 msec) has passed. If YES, go to ST07, if NO, YES This ST06 is repeated until it becomes.

ST07: The lap belt motor 62 is started. As a result, the lap belt pretensioner 61 starts to wind the loose portion of the lap belt portion 33.
ST08: The inflator 81 is ignited to generate gas. As a result, the front airbag 82 is inflated and deployed in the passenger compartment 12.

  ST09: Check whether the belt tension of the shoulder belt section 32 and the belt tension of the lap belt section 33 have reached a predetermined constant tension reference value (constant value). If YES, the process proceeds to ST10. If NO, This ST09 is repeated until it becomes YES. The belt tension of the shoulder belt portion 32 may be detected by the belt tension sensor 114 for the shoulder belt. The belt tension of the lap belt portion 33 may be detected by the lap belt belt tension sensor 115.

  ST10: After stopping the shoulder belt motor 43 and the lap belt motor 62, the control by this control flow is terminated. As a result, the shoulder belt pretensioner 42 finishes the winding operation of the loose portion of the shoulder belt portion 32. The lap belt pretensioner 61 ends the winding operation of the loose portion of the lap belt portion 33.

ST11: It is checked whether or not a side collision has occurred. If YES, the process proceeds to ST12. If NO, the process returns to ST01. For example, when the detection value detected by the side collision acceleration sensor 112 reaches a predetermined side collision reference value that is set in advance, the condition that the impact from the side against the vehicle 10 is detected is satisfied. It becomes a judgment of YES.
On the other hand, in the case of NO determination, since it is a normal state in which no frontal collision, rollover, or side collision has occurred, the process returns to ST01.

ST12: The lap belt motor 62 is kept stopped. Therefore, the lap belt pretensioner 61 does not wind up the loose portion of the lap belt portion 33 (rewinding prohibition).
ST13: The shoulder belt motor 43 is started. As a result, the shoulder belt pretensioner 42 winds up the loose portion of the shoulder belt portion 32.
ST14: The inflator 91 is ignited to generate gas. As a result, the side curtain airbag 92 is inflated and deployed in the passenger compartment 12.

ST15: It is checked whether or not the belt tension of the shoulder belt portion 32 has reached a predetermined constant tension reference value (a constant value). If YES, the process proceeds to ST16. If NO, this ST15 is repeated until YES. . The belt tension of the shoulder belt portion 32 may be detected by the belt tension sensor 114 for the shoulder belt.
ST16: After stopping the shoulder belt motor 43, the control by this control flow is terminated. As a result, the shoulder belt pretensioner 42 finishes the winding operation of the loose portion of the shoulder belt portion 32.

As is clear from the above description, ST03 corresponds to (1) a frontal collision determination unit that determines whether or not a condition that an impact from the front of the vehicle 10 is detected is satisfied, and (2) the vehicle 10 This corresponds to rollover judging means for judging whether or not the condition that there is a possibility of rollover or rollover is satisfied.
The aggregates of ST04 to ST07 correspond to both belt portion winding control means for winding the loose portions of both the shoulder belt portion 32 and the lap belt portion 33.
ST11 corresponds to side collision determination means for determining whether or not a condition that a side impact on the vehicle 10 is detected is satisfied.
ST12 corresponds to lap belt portion winding prohibiting means for prohibiting winding of the lap belt portion 33.
ST13 corresponds to a shoulder belt portion winding control means for winding a loose portion of the shoulder belt portion 32.

  To summarize the above description, as shown in FIGS. 1 and 4, when the control unit 101 satisfies the condition that an impact from the front of the vehicle 10 is detected (ST03 in FIG. 4), the shoulder belt unit 32 and the lap Both the shoulder belt motor 43 and the lap belt motor 62 are driven and controlled so as to wind up each loose portion of the belt portion 33 (ST04 to ST07 in FIG. 4), and the impact on the vehicle 10 from the side is detected. When the condition is satisfied (ST11 in FIG. 4), the shoulder belt motor 43 is driven and controlled so as to wind only the loose portion of the shoulder belt portion 32 (ST12 to ST13 in FIG. 4).

Next, operations of the vehicle seat belt device 30, the front protection airbag device 80, and the side protection airbag device 90 configured as described above will be described with reference to FIGS.
When the frontal collision acceleration sensor 111 detects an impact from the front of the vehicle 10, that is, when a frontal collision occurs, the control unit 101 causes the shoulder belt motor 43 and the lap belt motor 62 to move at a slight timing. Operate in two stages. With the motors 43 and 62 as power sources, the pretensioners 42 and 61 quickly wind up the loose portions of the shoulder belt portion 32 and the lap belt portion 33, respectively. As a result, both the upper body (shoulder and chest) and the waist of the occupant Ma can be quickly and reliably restrained by the seat belt 31. By reliably restricting the forward movement of both the upper body and the waist, it is possible to ensure the protection performance of the occupant Ma during a frontal collision.

  Further, the control unit 101 ignites the inflator 81 simultaneously with the operation of the motors 43 and 62 to generate gas. As a result, the front airbag 82 is inflated and deployed in the passenger compartment 12. In this way, the occupant Ma can be reliably protected.

  When the side collision acceleration sensor 112 detects a side impact on the vehicle 10, that is, when a side collision occurs, the control unit 101 operates only the shoulder belt motor 43. With this motor 43 as a power source, the shoulder belt pretensioner 42 winds up the loose portion of the shoulder belt portion 32. As a result, the shoulder belt portion 32 can reliably restrain the upper body (shoulder, chest, etc.) of the occupant Ma.

Furthermore, the control unit 101 ignites the inflator 91 simultaneously with the operation of the shoulder belt motor 43 or almost simultaneously to generate gas. As a result, the side curtain airbag 92 is inflated and deployed in the passenger compartment 12.
Since the upper body of the occupant Ma is reliably restrained by the shoulder belt portion 32, the relative displacement of the upper body with respect to the deployed side curtain airbag 92 can be restricted. Therefore, the upper body can be reliably protected by the side curtain airbag 92 at the time of a side collision.

By the way, when a side collision occurs, the lap belt motor 62 is maintained in a stopped state, so that the loosened portion of the lap belt portion 33 is only taken up by the shoulder belt motor 43 via the shoulder belt portion 32. It is. For this reason, the slack portion of the lap belt portion 33 is wound slightly later than the slack portion of the shoulder belt portion 32.
Even when a side collision occurs, the waist portion of the occupant Ma can slightly move in the vehicle width direction until the winding of the loose portion of the lap belt portion 33 is completed. That is, the lower body of the occupant Ma can move relative to the seat 20 in the vehicle width direction.

  The door 70 is deformed into the passenger compartment 12 by the collision energy En (see FIG. 2) acting on the vehicle 10 from the side. Depending on the amount of deformation, the shock absorber 75 may hit the waist of the occupant Ma via the door trim 73. At this time, the shock absorber 75 is deformed and pushes the waist of the occupant Ma through the door trim 73 toward the center of the vehicle width. By this pushing force, the waist portion of the occupant Ma can be moved in the vehicle width direction by the looseness of the lap belt portion 33.

  Thus, when a side collision occurs, the protection performance of the occupant Ma can be further enhanced by the comprehensive action of the impact absorption due to the deformation of the shock absorber 75 and the movement of the waist of the occupant Ma. Furthermore, the thickness of the shock absorber 75 can be reduced by the amount that the waist of the occupant Ma can move to the center of the vehicle width. In that case, the thickness of the door can be reduced.

In the embodiment of the present invention, the vehicle seat belt device 30 shown in FIG. 1 can be provided, for example, only in the driver's seat, only in the driver's seat and in the passenger's seat, or further in the rear seat.
The lap belt pretensioner 61 shown in FIG. 1 may be built in the center anchor 52. Even in such a case, the loose portion of the lap belt portion 33 can be wound up by the lap belt motor 62 in the event of an emergency of the vehicle 10, for example, in the event of a collision.

  Further, the shock absorber 75 shown in FIG. 2 is not limited to the configuration provided in the door 70, and the passenger compartment of the vehicle body 11 is protected so as to protect the occupant Ma against a side impact on the vehicle 10. Any structure may be used as long as it is disposed at a portion facing the twelve. That is, the shock absorber 75 may be provided on the side wall of the vehicle body 11 (such as the door 70 or the side wall of the center pillar).

Further, in step ST03 shown in FIG. 4, it may be configured to determine only whether or not a frontal collision has occurred.
Further, the presence or absence of steps ST05 to ST06 shown in FIG. 4 is arbitrary. By eliminating ST05 to ST06, the motors 43 and 62 can be started simultaneously.
Further, step ST8 shown in FIG. 4 may be executed at the same time as ST04 or between ST03 and ST04. Similarly, step ST14 shown in FIG. 4 may be executed at the same time as ST13 or between ST11 and ST13.
Further, the presence or absence of step ST12 shown in FIG. 4 is arbitrary. Since there is step ST01, it can also serve as step ST12.

  The vehicle seat belt device 30 according to the present invention is suitable for a device including two motors 43 and 62 for winding the loose portions of the shoulder belt portion 32 and the lap belt portion 33 of the seat belt 31 in an emergency.

It is the schematic diagram which fractured | ruptured the vehicle which concerns on this invention in the part of the center pillar, and was seen from the front. It is the schematic diagram which fractured | ruptured the vehicle which concerns on this invention in the part of the front door, and was seen from the front. 1 is a circuit diagram of a vehicle occupant protection system according to the present invention. It is a control flowchart of the control part which concerns on this invention. It is a schematic diagram of a conventional vehicle seat belt device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 20 ... Seat, 30 ... Seat belt apparatus for vehicles, 31 ... Seat belt, 32 ... Shoulder belt part, 33 ... Lap belt part, 42 ... Pretensioner, 43 ... Motor for shoulder belt, 61 ... Pretensioner, 62 ... Motor for lap belt, 101 ... Control unit, Ma ... Crew.

Claims (1)

A seat belt for restraining an occupant seated on a vehicle seat, a shoulder belt motor for a pretensioner that winds up a slack portion of the shoulder belt portion of the seat belt in an emergency, and a slack portion of the lap belt portion of the seat belt is emergency In a vehicle seat belt apparatus including a lap belt motor for a pretensioner that sometimes winds, and a control unit that drives and controls these motors,
When the condition that the impact from the front to the vehicle is detected is satisfied, the controller is configured to wind up the shoulder belt portion and the slack portions of the lap belt portion so as to wind up the shoulder belt motor and the lap belt. Both of the motors are driven and controlled, and when the condition that a side impact on the vehicle is detected is satisfied, only the shoulder belt motor is driven and controlled so as to wind up the loose portion of the shoulder belt. A vehicle seatbelt device characterized by having a configuration.

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