JP2008110691A - Vehicular seat belt control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular seat belt control device capable of retracting a seat belt preferably without impairment of the watching and listening to an AV by an occupant while ensuring the safety of the occupant as the seat belt is detached. <P>SOLUTION: The vehicular seat belt control device for controlling a seat belt device capable of retracting a seat belt for restraining an occupant seated in a seat by a drive motor comprises a restraint state detection means for detecting whether or not the occupant is restrained by the seat belt, and an occupant get-off will detection means for detecting the get-off will of the occupant. The seat belt device is controlled so that the seat belt is retracted by the drive motor if the get-off will of the occupant is detected by the occupant get-off will detection means after detecting the release of the restraint state of the occupant by the seat belt by the restraint state detection means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle seat belt control device that controls a seat belt device in which a seat belt for restraining an occupant seated on a seat can be wound by a drive motor.

  2. Description of the Related Art Conventionally, as a seat belt device, there is known a seat belt device provided with a pretensioner mechanism that winds up a seat belt using a drive motor so that an occupant can be restrained by a seat at the time of a vehicle collision, for example. . In relation to this, for example, Japanese Patent Application Laid-Open No. 2002-127871 uses a pretensioner mechanism that winds a seat belt with a drive motor in the event of a vehicle collision, and a tang on the buckle when the occupant wears the seat belt. An apparatus for winding a seat belt with a drive motor without giving an uncomfortable feeling of pressure to an occupant according to the engagement is disclosed.

JP 2002-127871 A

By the way, in the device in which the seat belt is wound up by the drive motor as described above, it is necessary to wind up the seat belt pulled out by the occupant with the drive motor so that the seat belt is not slackened when the occupant removes the tongue from the buckle. However, immediately after the tongue is removed from the buckle, for example, the occupant may still be holding the tongue or the seat belt may be caught on the occupant's body. This is not preferable as the timing for starting the winding.
Immediately after the tongue is removed from the buckle, the vehicle may be in an ignition-on state, and the occupant may be watching audio or video (hereinafter abbreviated as AV) in the vehicle. The operation sound of the drive motor hinders viewing and is not preferable as the timing for starting the seat belt winding.

  The present invention has been made in view of the above technical problem, and with the removal of the seat belt, it is possible to wind up the seat belt preferably while preventing the AV viewing by the occupant while ensuring the occupant safety. An object of the present invention is to provide a vehicle seat belt control device.

  Therefore, the invention according to claim 1 of the present application is directed to a vehicle seat belt control apparatus for controlling a seat belt apparatus in which a seat belt for restraining an occupant seated on a seat can be wound by a drive motor. A restraint state detecting means for detecting whether or not the occupant is restrained and an occupant disengagement intention detecting means for detecting the occupant's intention to get off the vehicle. After the release of the state is detected, the seat belt device is controlled so that the seat belt is wound up by the drive motor when the passenger's intention to get off is detected by the passenger getting-off intention detection means. It is a feature.

  The invention according to claim 2 of the present application is the invention according to claim 1, further comprising ignition on / off detecting means for detecting whether the vehicle is in an ignition on state or an off state, The means detects the passenger's intention to get off in response to the ignition off state being detected by the ignition on / off detecting means.

  Furthermore, the invention according to claim 3 of the present application is the invention according to claim 1 or 2, further comprising door opening detection means for detecting opening of a vehicle door, wherein the get-off intention detection means is configured to open the door. The present invention is characterized in that an occupant's intention to get off is detected in response to detection of the opening of the vehicle door by the detection means.

  Furthermore, the invention according to claim 4 of the present application is the invention according to any one of claims 1 to 3, wherein the drive motor is driven to rotate forward for a predetermined time when the seat belt is wound by the drive motor. Further, the seat belt device is controlled.

  Furthermore, the invention according to claim 5 of the present application is the belt holding mechanism for holding the seat belt at a predetermined winding position in the seat belt device according to the invention according to claim 4, There is provided a belt holding mechanism that secures the seat belt holding state according to the forward drive of the drive motor, while releasing the seat belt holding state according to the reverse drive of the drive motor. The seat belt device is controlled such that the drive motor is driven to rotate backward for a predetermined time after being driven forward.

  Furthermore, the invention according to claim 6 of the present application is the invention according to any one of claims 1 to 5, further comprising a collision prediction means for predicting a collision of the vehicle. When this is predicted, the seat belt device is controlled so that the seat belt is wound by a predetermined amount by a drive motor.

  According to the first aspect of the present invention, the seat belt is wound by the drive motor when the occupant's intention to get off is detected after the release of the restraint state of the occupant by the seat belt is detected. It is possible to eliminate the possibility of the seat belt being wound while the occupant grasps the tongue or the seat belt is caught on the occupant's body, and it is possible to realize the winding of the seat belt with ensured occupant safety. it can.

  In addition, according to the invention according to claim 2 of the present application, basically, the same effect as that of the invention according to claim 1 can be obtained more reliably, and in addition, the ignition off state of the vehicle can be detected. Accordingly, the passenger's intention to get off the vehicle is detected, and the seat belt winding by the drive motor is started. Therefore, the seat belt can be wound without hindering the AV viewing by the passenger.

  Further, according to the invention of claim 3 of the present application, basically, the same effect as that of the invention of claim 1 can be obtained more reliably.

  Furthermore, according to the invention of claim 4 of the present application, the drive motor is driven to rotate forward for a predetermined time to such an extent that the seat belt is not loosened, so that the seat belt can be reliably wound.

  Furthermore, according to the invention according to claim 5 of the present application, the drive motor is driven to rotate forward in accordance with the detection of the passenger's intention to get off, and after the seat belt is wound up, the drive motor is driven to rotate backward. Thus, since the seat belt is released from the holding state by the belt holding mechanism, the occupant can smoothly pull out the seat belt when the seat belt is subsequently attached.

  Furthermore, according to the invention of claim 6 of the present application, when a vehicle collision is predicted, the seat belt device is controlled so that the seat belt acts as a pretensioner that is wound by a predetermined amount by the drive motor. Therefore, the protection effect of the occupant prepared for the collision can be improved.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is an explanatory diagram showing the overall configuration of a vehicle equipped with a seat belt control device according to an embodiment of the present invention. In this vehicle 1, a seat belt 3 that restrains an occupant seated on the seat 2 is wound around a retractor 4 fixed to a lower portion of a center pillar (not shown) of the vehicle 1 on one end side, and extends upward from the retractor 4. The other end is coupled to the outer anchor 7 fixed to the lower part of the center pillar through the shoulder anchor 5 positioned above the center pillar and further through the tongue 6. The tongue 6 is inserted into a buckle 8 fixed on the opposite side of the outer anchor 7 across the seat 2.

  As shown in FIG. 2, the retractor 4 includes a retractor body 10 including a belt winding drum, which will be described in detail later, a first winding unit 11, and a second winding unit 12. . The first winding unit 11 uses the drive motor 41 (see FIG. 8) to wind up the seat belt 3 when a collision of the vehicle 1 is predicted, while the collision avoidance of the vehicle 1 is determined. In this case, the seat belt 3 is released from the wound state. Further, the second winding unit 12 explodes explosives when the collision of the vehicle 1 is detected, and winds up the seat belt 3 irreversibly at a higher speed than the first winding unit 11. is there. The first and second winding units 11 and 12 are configured in the same manner as a configuration conventionally known as a pretensioner, thereby improving the protection effect of the occupant in preparation for a collision. .

  Further, as shown in FIG. 1, a control unit 13 using a microcomputer is provided in order to control the operations of the first and second winding units 11 and 12. In the present embodiment, in the vehicle 1, an obstacle detection sensor 14 for detecting an obstacle present on the travel route of the vehicle 1, and DSC (Dynamic Stability Control) control for detecting that it is in an operating state. A DSC operation detection sensor 15, a brake operation detection sensor 16 for detecting that the brake is in an operating state, an impact detection sensor 17 for detecting an impact received by the vehicle 1 from the outside, and the vehicle 1 in an ignition-on state Alternatively, an ignition on / off detection sensor 18 for detecting whether the sensor is in an off state is provided, and signals from these sensors are input to the control unit 13.

  In addition, in this embodiment, although not particularly illustrated, a sensor (hereinafter referred to as a “tung attachment / detachment detection sensor”) for detecting the attachment / detachment state of the tongue 6 with respect to the buckle 8 is provided in the buckle 8 and the seat belt 3. Sensors for detecting the amount of drawer and the amount of drawer acceleration (hereinafter referred to as “drawer amount and drawer acceleration detection sensor”) are provided in the retractor 4, and signals from these sensors are also controlled by the control unit. 13 is input. An infrared sensor or millimeter wave radar can be used as the obstacle detection sensor 14, and a G sensor can be used as the impact detection sensor 17.

  Subsequently, as shown in FIG. 3, a belt winding drum (hereinafter simply referred to as a “winding drum”) 22 is provided in the housing 21 of the retractor body 10, and on the side of the housing 21. The belt pull-out sensitive lock mechanism X that locks the pull-out when the seat belt 3 is pulled out at a predetermined acceleration or more, and the acceleration (deceleration) applied to the retractor body 10 due to vehicle collision, sudden braking, cornering traveling, etc. A vehicle body sensitive lock mechanism Y that locks the withdrawal of the seat belt 3 when the inclination angle of the retractor body 10 is equal to or greater than a predetermined value (when the behavior of the retractor body 10 is equal to or greater than a predetermined value) is provided.

  The take-up drum 22 is rotatably supported by the housing 21 and is urged to rotate in the take-up direction of the seat belt 3 by a spiral spring (not shown). A drum shaft 23 is inserted into the winding drum 22, and one end of the drum shaft 23 is rotatably supported on a side wall (not shown) of the housing 21, while the other end is a cover 24 (hereinafter referred to as a cover 24). (Referred to as a housing cover).

  A winding drum 22 is splined to one end of the drum shaft 23, and a guide drum 25 is splined to the other end. A locking clutch 26 is pivotally supported on the other end side of the guide drum 25 so as to be relatively rotatable. The locking clutch 26 is rotatable relative to the guide drum 25 within a predetermined angle range. Yes. The locking clutch 26 is biased in the belt drawing direction by a spring (not shown).

  As shown in FIG. 4, a locking arm 27 having a lock claw 27 a on the distal end side (the upper end side in FIG. 4) is swingably attached to the locking clutch 26. On the other hand, on the inner peripheral surface of the housing cover 24, a lock ratchet 28 that engages with a locking claw 27a of the locking arm 27 and prevents the locking clutch 26 from rotating by this engagement is formed. Here, the locking arm 27 is urged by the sensor spring 29 in a direction to release the engagement between the lock claw 27a and the cover ratchet 28, but the locking clutch 26 is rotated in the belt pulling direction at a predetermined acceleration or more. At this time, the lock claw 27a is engaged with the cover ratchet 28 by rotating relative to the winding direction (arrow a in FIG. 4) against the urging force of the sensor spring 29.

  Further, as shown in FIG. 6, the guide drum 25 is provided with a pawl 31 having a claw portion 31a. The pawl 31 is slidably accommodated in a guide groove 25a (see FIGS. 5 and 6) formed in the guide drum 25 so that the claw portion 31a can protrude or retract from the outer peripheral surface of the guide drum 25. It is configured. On the other hand, a housing ratchet 32 is formed at the opening edge of the side plate of the retractor housing 21, and the pawl 31 engages with the housing ratchet 32, whereby the guide drum 25 rotates in the seat belt pull-out direction. Is blocked (state shown in FIG. 6).

  Here, the pawl 31 is provided with a guide pin 33 protruding in the axial direction, while the locking clutch 26 is formed with a guide hole 34 (see FIGS. 3 and 4). When the guide pin 33 is inserted into the guide hole 34 and the pawl 31 is guided by the guide hole 34, the claw portion 31a of the pawl 31 protrudes or retreats from the outer peripheral surface of the guide drum 25 (arrow in FIG. 6). b).

  By adopting the above-described configuration, when the seat belt 3 is pulled out, the locking clutch 26 rotates in the pull-out direction of the seat belt 3 in synchronization with the guide drum 25, and the pull-out acceleration is less than a predetermined value. In some cases, the engagement between the locking arm 27 and the cover ratchet 28 is prevented by the biasing force of the sensor spring 29 as shown in FIG. In this case, when the seat belt 3 is pulled out and then stopped, the seat belt 3 is wound around the winding drum 22 by the action of a spiral spring (not shown).

  On the other hand, when the pull-out acceleration of the seat belt 3 is equal to or greater than a predetermined value, the inertial force of the locking arm 27 in the a direction (see FIG. 4) exceeds the urging force of the sensor spring 29, and the leading end side of the locking arm 27 The locking claw 27 a engages with the cover ratchet 28. As a result, rotation of the locking clutch 26 that is the same body as the locking arm 27 is prevented, and the guide drum 25 rotates relative to the locking clutch 26 in the pull-out direction within a predetermined angle range. Accordingly, as shown in FIG. 6, the pawl portion 31 a of the pawl 31 protrudes from the outer peripheral surface of the guide drum 25 by the guide hole 34 and engages with the housing ratchet 32.

  Thereby, the rotation of the guide drum 25 is blocked, the rotation of the winding drum 22 is also blocked, and the drawer of the seat belt 3 is locked. In this state, when the withdrawal of the seat belt 3 is stopped, the take-up drum 22 and the guide drum 25 are rotated in the take-up direction of the seat belt 3 by the action of a spiral spring (not shown). In conjunction with this, the pawl 311 is retracted from the outer peripheral surface of the guide drum 25 by the guide hole 24 and the engagement between the pawl 31 and the housing ratchet 32 is released.

  When the guide drum 25 is rotated in the winding direction beyond the predetermined angle range, the locking clutch 26 is also rotated in the winding direction. As a result, the engagement between the locking arm 27 and the cover ratchet 28 is released. Then, the state in which the withdrawal of the seat belt 3 is locked is released, and the withdrawal operation and the winding operation of the seat belt 3 can be executed again.

  Next, the vehicle body sensitive lock mechanism Y will be described. As shown in FIGS. 3 and 4, a clutch ratchet 35 is formed on the outer peripheral surface of the locking clutch 26. On the other hand, a sensor lever 36 is swingably provided below the housing cover 24, and when the sensor lever 36 is engaged with the clutch ratchet 35, the locking clutch 26 extends in the direction in which the seat belt 3 is pulled out. Rotation is prevented (state shown in FIG. 7).

  A box-shaped sensor holder 37 is fixed below the housing cover 24, and a spherical sensor weight 38 is placed on the horizontal bottom surface of the sensor holder 37. The bottom surface of the sensor holder 37 is provided with a seat surface that is recessed in a spherical shape (see FIG. 7). Normally, as shown in FIG. 4, the sensor weight 38 stably falls on the recess seat surface. Yes. The sensor lever 36 described above is supported on the vertical wall of the sensor holder 37 so as to be swingable while covering the sensor weight 38.

  In the state where the sensor weight 38 is positioned on the concave seat surface, the sensor lever 36 does not engage with the clutch ratchet 35 of the locking clutch 26 as shown in FIG. . However, as described above, when acceleration of a predetermined value or more acts on the retractor body 10 or when the retractor body 10 is inclined at an angle of a predetermined value or more, the sensor weight 38 is moved as shown in FIG. The sensor lever 37 comes out of the concave seating surface, pushes the sensor lever 36 upward (arrow c in FIG. 7), and the sensor lever 36 is engaged with the clutch ratchet 335. As a result, the rotation of the locking clutch 26 in the pull-out direction of the seat belt 3 is prevented in the same manner as in the case of the pull-out sensitive lock mechanism X. As a result, the pawl 31 of the guide drum 25 protrudes from the outer peripheral surface of the guide drum 25. Engage with the housing ratchet 32. Then, the rotation of the take-up drum 22 in the pull-out direction of the seat belt 3 is prevented, and the pull-out of the seat belt 3 is locked.

  In this state, when the withdrawal of the seat belt 3 is stopped, the take-up drum 22 and the guide drum 25 rotate in the take-up direction of the seat belt 3, the engagement between the pawl 31 and the housing ratchet 32 is released, and then The locking clutch 2 rotates in the winding direction, and as a result, the engagement between the sensor lever 36 and the clutch ratchet 35 is also released. Thereby, the state in which the withdrawal of the seat belt 3 is locked is released, and the withdrawal operation and the winding operation of the seat belt 3 can be executed again.

  Next, the first winding unit 11 will be described. As shown in FIGS. 8 and 9, the first winding unit 11 includes a drive motor 41. The drive motor 41 rotates the motor gear 42 attached to the output shaft in both directions of winding and drawing. Drive. The first winding unit 11 includes a large-diameter gear 43 that is rotatably supported on the drum shaft 23, and the large-diameter gear 43 meshes with the motor gear 42.

  The large-diameter gear 43 is provided with a pair of pawls 44 and 44 at symmetrical positions with the drum shaft 23 interposed therebetween. A ratchet 45 is integrally coupled to the drum shaft 23, and the ratchet 45 pawls the rotational driving force when the drive motor 41 rotates in the seat belt 3 winding direction (forward rotation direction). , 44 for receiving.

  On the other hand, a guide member 47 is rotatably provided in a case (not shown) that holds the drum shaft 23. When the large-diameter gear 43 rotates in the winding direction of the seat belt 3, the guide member 47 rotates relative to the pull-out direction (arrow d in FIG. 9) by the inertial force, and the pawls 44 and 44 are moved. Guide in the direction of arrow e in FIG. Then, the guided pawls 44 and 44 are engaged with the ratchet 45 against the urging force of the springs 46 and 46 (state shown in FIG. 9).

  Therefore, when the large-diameter gear 43 is rotated in the winding direction of the seat belt 3 by the rotational drive of the drive motor 41, the pawls 44 and 44 are engaged with the ratchet 45 by the guide member 47. The drum shaft 23 and the take-up drum 22 are integrally rotated in the take-up direction of the seat belt 3, and accordingly, the seat belt 3 is taken up by the take-up drum 22. That is, when the drive motor 41 rotates in the seat belt 3 winding direction, the power transmission path between the drive motor 41 and the winding drum 22 is connected by the pawls 44 and 44 and the ratchet 45, and the winding is performed. The take-up drum 22 can be driven to rotate in the winding direction of the seat belt 3.

  On the other hand, when the rotational drive of the drive motor 41 is stopped, the pawls 44 and 44 continue to be regulated by the guide member 47 and are kept engaged with the ratchet 45. As a result, the first winding unit 11 allows rotation of the seat belt 3 in the pull-out direction (reverse rotation direction) while applying rotational resistance to the drum shaft 23. Hereinafter, this state is referred to as a belt holding state in which the seat belt 3 is held so that it can be pulled out.

  When a force in the direction in which the seat belt 3 is pulled out is applied to the drum shaft 23, the force is transmitted to the motor gear 42 via the ratchet 45, the pawls 44, 44, and the large-diameter gear 43, and the motor gear 42 reverses. Then, the seat belt 3 rotates in the pull-out direction. At this time, the rotational resistance by the drive motor 41 is given, and the gear ratio between the motor gear 42 and the large-diameter gear 43 is large. Will be given.

  In this state, when the drive motor 41 is driven to rotate in the pull-out direction, the large-diameter gear 43 rotates in the reverse direction, that is, rotates in the pull-out direction of the seat belt 3, and the guide member 47 rotates relatively in the take-up direction. The pawls 44, 44 and the ratchet 45 are disengaged. That is, the power transmission path between the drive motor 41 and the take-up drum 22 is cut off, and the engagement between the first take-up unit 11 and the drum shaft 23 is released. Without being subjected to rotational resistance from one winding unit 11, the seat belt 3 can be rotated in either the winding direction or the drawing direction, that is, the belt holding state is released.

Next, control of the first and second winding units 11 and 12 by the control unit 13 will be described.
The control unit 13 includes an obstacle detection sensor 14, a DSC operation detection sensor 15, a brake operation detection sensor 16, an impact detection sensor 17, an ignition on / off detection sensor 18, a tongue attachment / detachment detection sensor, a drawer amount and a drawer acceleration detection sensor. A control signal is output to the first winding unit 11 and the second winding unit 12 on the basis of the signal input from. Here, in the control unit 13, based on a signal input from the obstacle detection sensor 14, a collision prediction function for predicting a collision between the vehicle 1 and the obstacle, and a collision is avoided after the vehicle 1 is predicted by the collision prediction function. A collision avoidance detection function for detecting whether or not the vehicle has been hit, and a constraint release for releasing the restraint of the occupant in the vehicle 1 by the first winding unit 11 when the collision avoidance detection function detects that the collision has been avoided Function: An ignition on / off detection function for detecting the ignition on / off state of the vehicle 1 based on a signal input from the ignition on / off detection sensor 18 is set.

  In addition, in the present embodiment, in the control unit 13, based on a signal input from the tongue attachment / detachment detection sensor, input from the tongue attachment / detachment detection function for detecting the attachment / detachment state of the tongue 6 with respect to the buckle 8, the amount of extraction, and the input acceleration detection sensor. Based on this signal, a pull-out amount and pull-out acceleration detection function for detecting the pull-out amount and pull-out acceleration of the seat belt 3 is set.

  First, according to the collision prediction function, the relative speed between the vehicle 1 and the obstacle existing in front of the vehicle 1 is calculated based on the input signal from the obstacle detection sensor 14, and the safe inter-vehicle distance of the vehicle 1 is obtained. When the distance between the vehicle 1 and the obstacle is equal to or less than the safe inter-vehicle distance, the passenger is informed that there is a possibility of a collision. As described above, when the obstacle detection sensor 14 is constituted by a millimeter wave radar, the time from when the wave emitted from the vehicle 1 is reflected by the obstacle and returns to the vehicle 1 again is used. The actual distance between the vehicle 1 and the obstacle is determined. Then, the relative speed is calculated based on the time change of the distance, and the safe inter-vehicle distance is set according to the relative speed.

  Moreover, according to the collision avoidance detection function, after performing the collision prediction by the collision prediction function, it is avoided that the vehicle 1 collides with an obstacle ahead when at least one of the following five conditions is satisfied. Is detected. Thereby, the collision prediction by a collision prediction function is complete | finished.

  The five conditions under which collision avoidance of the vehicle 1 is detected are as follows: (1) When the DSC operation is released and a signal to that effect is input from the DSC operation detection sensor 15, (2) The brake pedal is operated. When the signal is input from the brake operation detection sensor 16 after being released, (3) When the signal is not input from the impact detection sensor 17 within a predetermined time from the time when the collision prediction is performed by the collision prediction function, 4) A case where a predetermined time has elapsed since the time when the collision was predicted, and (5) a case where a signal for detecting the operation of the airbag device (not shown) was not input within the predetermined time. Note that “DSC” is an integrated control of engine output and brake output to suppress side slip of the vehicle 1 when the driver suddenly operates the steering wheel or performs a sharp curve. Thus, the system enables the vehicle 1 to maintain a stable traveling posture.

  In the present embodiment, it can be considered that the collision avoidance operation has ended in response to the release of the operation of the brake pedal (not shown). Further, it can be considered that the side slip of the host vehicle has been eliminated in response to the release of the DSC operation, and the collision can be avoided by the steering operation of the driver. Further, even when neither the brake pedal nor the DSC operation release signal is present, it is considered that the collision has been avoided by the steering operation of the driver or the like in response to the fact that the impact is not detected within the predetermined time or the airbag is not activated. be able to.

  The impact detection sensor 17 detects whether or not an impact of a predetermined value or more is applied to the vehicle 1 when the vehicle 1 causes a collision with an obstacle ahead. The airbag device (not shown) is instantly inflated when the impact detection sensor 17 detects that an impact of a predetermined value or more is applied to the vehicle 1, and the occupant collides with a structure in the vehicle 1. It is to prevent that.

  Further, according to the restraint release function, as collision avoidance is detected by the collision avoidance function, the drive motor 41 of the first winding unit 11 is operated, and the winding drum 22 is driven to rotate in the belt winding direction. Be made. Thereafter, the rotation drive of the take-up drum 22 is stopped to allow the take-up drum 22 to rotate in the belt drawing direction, and the engagement between the first take-up unit 11 and the take-up drum 22 is released. Thus, the winding drum 22 is allowed to be driven to rotate in the direction in which the seat belt 3 is pulled out.

  Furthermore, according to the ignition on / off detection function, the ignition on / off state of the vehicle 1 is detected based on the signal input from the ignition on / off detection sensor 18. Further, according to the tongue attachment / detachment detection function, the attachment / detachment state of the tongue 6 with respect to the buckle 8 is detected based on a signal input from the tongue attachment / detachment detection sensor. Furthermore, according to the pull-out amount and pull-out acceleration detection function, the pull-out amount and pull-out acceleration of the seat belt 3 are detected based on signals input from the pull-out amount and pull-out acceleration detection sensors.

  In the present seat belt device, the seat belt 3 pulled out during use is wound up by the drive motor 41 so that the tongue 6 is removed from the buckle 8, but the tongue 6 is removed from the buckle 8. Immediately after that, for example, there is a possibility that the occupant is still holding the tongue 6 or the seat belt 3 is caught on the occupant's body. It is not preferable. In addition, immediately after the tongue 6 is removed from the buckle 8, the vehicle 1 is in an ignition-on state, and there is a possibility that the occupant is viewing AV in the vehicle. Similarly, the timing for starting the winding of the seat belt 3 is not preferable. In response to this, in the present embodiment, after the tongue 6 is removed from the buckle 8, a seat belt control process in which the seat belt 3 is wound is executed only when the passenger's intention to get off the vehicle is detected. The Here, it is determined that the occupant's intention to get off is detected in response to the detection of the ignition-off state of the vehicle 1.

  FIG. 10 is a flowchart of the seat belt control process. In this process, first, whether or not the release of the restraint state of the occupant by the seat belt 3 has been detected, that is, whether or not the tongue 6 has been removed from the buckle 8 based on the signal input from the tongue attachment / detachment detection sensor 18. It is determined (# 11). As a result, when the release of the restraint state is not detected, step # 11 is repeated. On the other hand, when the release of the restraint state is detected, whether or not a predetermined time has elapsed since the release of the restraint state is subsequently determined. Is determined (# 12).

  As a result of step # 12, when it is determined that the predetermined time has not elapsed since the release of the restraint state, step # 12 is repeated, and on the other hand, when it is determined that the predetermined time has elapsed since the release of the restraint state Subsequently, it is determined whether or not the vehicle 1 is in an ignition-off state (# 13). As a result, when it is determined that the vehicle 1 is in the ignition-on state, the process proceeds to step # 17. On the other hand, when it is determined that the vehicle 1 is in the ignition-off state, the process proceeds to step # 14.

  In step # 17, it is determined whether or not the restraint state of the occupant by the seat belt 3 is detected. As a result, if the restraint state of the occupant is not detected, the process returns to step # 13, and the subsequent steps are performed. On the other hand, when the restraint state of the occupant is detected, the process returns to step # 11 and the subsequent steps are repeated.

  In step # 14, the drive motor 41 is driven to rotate forward so that the seat belt 3 is wound. Thereafter, it is determined whether or not the drive motor 41 has been normally driven for a predetermined time, that is, whether or not the seat belt 3 has been wound for a predetermined time (# 15). If it is determined, step # 15 is repeated. On the other hand, if it is determined that the forward rotation drive has been performed for a predetermined time, then the drive motor 41 is driven in the reverse direction to hold the seat belt 3 by the belt holding mechanism. The state is released (# 16). The process is thus completed.

  As is apparent from the above description, according to the present embodiment, the seat belt 3 is not wound immediately after the tongue 6 is removed from the buckle 8, but is adapted to the occupant's intention to get off, such as a change to the ignition-off state. This is started in response to the detected change in the state of the vehicle 1, so that there is no possibility of the seat belt 3 being wound while the occupant grips the tongue 6 or the seat belt 3 is caught on the occupant's body. Therefore, it is possible to realize the winding of the seat belt 3 in which occupant safety is ensured. In addition, the passenger's intention to get off is detected based on the detection of the ignition off state of the vehicle 1 and the winding of the seat belt 3 by the drive motor 41 is started. The belt 3 can be wound up.

It should be noted that the present invention is not limited to the illustrated embodiments, and it goes without saying that various improvements and design changes can be made without departing from the scope of the present invention.
For example, in the above-described embodiment, the ignition on / off detection sensor 18 is used as means for detecting the occupant's intention to get off by the seat belt 3, but the invention is not limited to this, and the opening of the door of the vehicle 1 is detected. Door opening detection means may be used. According to this, the seat belt 3 is wound by the drive motor 41 only when the opening of the door of the vehicle 1 is detected after the removal of the tongue 6 from the buckle 8 is detected. Similarly, it is possible to eliminate the possibility of the seat belt 3 being wound while the occupant grasps the tongue 6 or the seat belt 3 is caught on the occupant's body, and the safety of the seat belt 3 is ensured. Winding can be realized.

It is a figure which shows the basic composition of the seatbelt apparatus which concerns on embodiment of this invention, and its control apparatus. It is a front view around a retractor. It is longitudinal cross-sectional explanatory drawing which shows the locking mechanism of a retractor main body. It is longitudinal cross-sectional explanatory drawing along the II line | wire in FIG. It is longitudinal cross-sectional explanatory drawing along the II-II line | wire in FIG. FIG. 6 is a cross-sectional explanatory view similar to FIG. 5, showing a state where the panel and the housing ratchet are in an engaged state. FIG. 5 is an explanatory cross-sectional view similar to FIG. 4 and shows a state in which the vehicle body sensitive lock mechanism is activated. It is a whole block diagram of a 1st winding unit, and shows a mode that this 1st winding unit is in a non-operation state. It is a whole block diagram similar to FIG. 8, and shows a mode that the 1st winding unit is in an operation state. It is a flowchart about the seatbelt control process which a control unit performs.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Seat, 3 ... Seat belt, 4 ... Retractor, 6 ... Tongue, 8 ... Buckle, 10 ... Retractor body, 11 ... First winding unit, 12 ... Second winding unit, 13 ... Control unit, 14 ... obstacle detection sensor, 41 ... drive motor.

Claims (6)

In a vehicle seat belt control device for controlling a seat belt device in which a seat belt for restraining an occupant seated on a seat can be wound by a drive motor,
Restraint state detecting means for detecting whether or not the occupant is restrained by the seat belt;
Occupant getting-off intention detecting means for detecting the occupant's intention to get off is provided,
After the release of the restraint state of the occupant by the seat belt is detected by the restraint state detection means, the seat belt is wound by the drive motor when the occupant's intention to get off is detected by the occupant drop-out intention detection means. Thus, the seatbelt control apparatus for vehicles which controls the said seatbelt apparatus. Furthermore, an ignition on / off detection means for detecting whether the vehicle is in an ignition on state or an off state is provided,
2. The vehicle seat belt control device according to claim 1, wherein the get-off intention detecting means detects an occupant's intention to get off when the ignition off state is detected by the ignition on / off detecting means. Furthermore, door opening detection means for detecting the opening of the vehicle door is provided,
The vehicle seat belt according to claim 1 or 2, wherein the get-off intention detecting means detects an occupant's intention to get off when the door opening detection means detects the opening of the vehicle door. Control device.   The vehicle according to any one of claims 1 to 3, wherein the seat belt device is controlled so that the drive motor is driven to rotate forward for a predetermined time when the seat belt is wound by the drive motor. Seat belt control device. The seat belt device includes a belt holding mechanism for holding the seat belt at a predetermined winding position, and the holding state of the seat belt is ensured according to the forward rotation of the drive motor. A belt holding mechanism that releases the holding state of the seat belt according to the reverse drive of the drive motor is provided,
5. The seat belt control device for a vehicle according to claim 4, wherein the seat belt device is controlled so that the drive motor is driven to rotate backward for a predetermined time after being driven forward. Furthermore, a collision prediction means for predicting a vehicle collision is provided,
6. The seat belt device according to claim 1, wherein the seat belt device is controlled so that a predetermined amount of the seat belt is taken up by a drive motor when a collision of a vehicle is predicted by the collision prediction means. A vehicle seat belt control device according to claim 1.

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