JP2006159954A - Webbing take-up device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a webbing take-up device capable of securely storing a webbing belt pulled out by a driving force of a driving means. <P>SOLUTION: In the webbing take-up device 10, when a tang plate is taken out from a buckle device in a state where the door of a vehicle is opened, a spool 32 is rotated in the taking-up direction until a lock current flows into a motor 100. After the drive of the motor 100 is stopped once, the rotating force to the take-up direction is applied to the spool 32 by driving the motor again. Even if the tang plate is sandwiched between a seat cushion and the seat back of the seat thereby, and the webbing belt 34 cannot be taken up by the first drive of the motor 100 until a state referred to as "Totally stored", the sandwiching of the tang plate 42 can be resolved by an initial torque at starting of the second drive of the motor 100, and furthermore, the webbing belt 34 can be taken up until the state referred to as "Totally stored". <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a webbing retractor constituting a seat belt device for restraining the body of an occupant seated on a seat of a vehicle or the like with a long belt-like webbing belt, and in particular, the webbing belt is driven by a driving force of a motor or the like. The present invention relates to a webbing take-up device capable of taking up and storing.

  A seat belt device that restrains the body of an occupant seated in a vehicle seat with a long belt-like webbing belt includes a webbing take-up device that is fixed to the vehicle body on the side of the seat. The webbing take-up device includes, for example, a spool (winding shaft) whose axial direction is substantially along the vehicle front-rear direction, and the longitudinal base end side of the webbing belt is locked to the spool. The spool can wind the webbing belt around the outer periphery of the spool, and when the seat belt device is not used, the spool is wound around the outer periphery of the spool.

  Also, this type of webbing take-up device is called a motor retractor or an electric retractor that takes up a webbing belt by rotating a spool with a driving force of a motor, and an example thereof is disclosed in Patent Document 1 below. ing.

  In the motor retractor disclosed in Patent Document 1, the buckle switch detects that the tongue plate provided on the webbing belt has come out of the buckle device, that is, that the webbing belt is not attached to the occupant's body. Then, the seat belt control device closes the contacts between the motor drive circuit and the clutch switching mechanism and the power source. When the contact is closed, the clutch switching mechanism operates a clutch interposed between the motor and the spool to connect the motor and the spool, and the motor driving circuit drives the motor.

  As a result, a current flows through the motor for a certain time, and the motor is driven for a certain time. When the driving force of this motor is transmitted to the spool via the speed reduction mechanism and the clutch, the spool rotates in the winding direction and winds up the webbing belt.

Further, in the motor retractor disclosed in Patent Literature 1, when the door switch (curtain switch) detects that the door is opened, or the engine key (ignition key) is removed from the engine key switch (ignition device). The above contacts are closed for a certain time. Thereby, even if the winding of the webbing belt when the tongue plate is pulled out from the buckle device is insufficient, the webbing belt can be reliably wound and stored by performing the winding again.
JP 2001-163186 A

  By the way, the webbing belt winding device disclosed in Patent Document 1 has a structure in which the motor is driven in a state in which it is considered that the occupant gets off in addition to winding the webbing belt by a signal from the buckle switch. Therefore, for example, when the door is already opened when the tongue plate comes out of the buckle device, it is highly possible that the motor drive is not resumed after the motor drive is completed.

  In such a case, if the webbing belt is not completely wound up, the webbing belt is maintained in an extended state and looks bad, and if the door is closed in this state, the tongue plate or webbing The belt is caught between the door and the entrance of the vehicle.

  An object of the present invention is to obtain a webbing take-up device that can securely store the pulled-out webbing belt with the driving force of the driving means in consideration of the above facts.

  In the webbing take-up device according to the first aspect of the present invention, a spool in which a base end portion of a long belt-like webbing belt is locked is rotated in one winding direction around the axis by the driving force of the driving means. A webbing take-up device that winds the webbing belt around the outer periphery of the spool, and detects whether or not the webbing belt is worn on the body of an occupant and releases the webbing belt. A mounting detection means for outputting a mounting release signal and a door opening / closing detection for detecting opening / closing of a vehicle door, outputting an opening signal when the door is open, and outputting a closing signal when the door is closed And when the mounting release signal is input, the driving means is driven to rotate the spool in the winding direction, and the spool is rotated in the winding direction. The driving unit is stopped by being restricted, and the driving signal is stopped after the driving unit is stopped by inputting the release signal after the mounting release signal is input and before the driving unit is stopped. When the closing signal is input between the time when the driving means is restarted and the time when the driving means is stopped after the mounting release signal is input, the opening signal is input after the driving means is stopped. And a control means for re-driving the drive means.

  According to the webbing take-up device of the present invention as set forth in claim 1, an occupant seated on a seat with a long belt-like webbing belt drawn out from a spool hangs around the body and wears the webbing belt. The body is restrained by the webbing belt.

  Further, when the occupant releases the wearing state of the webbing belt and a mounting release signal is output from the mounting detection unit, the control unit drives the driving unit. The driving force of the driving means is transmitted to the spool, and the spool is rotated in the winding direction. When the spool is rotated in the winding direction by the driving force of the driving means, the webbing belt is wound in layers on the outer peripheral portion of the spool from the base end side in the longitudinal direction.

  Furthermore, since the webbing belt is wound around the spool from the base end side, the length of the part of the webbing belt that is not wound around the spool is shortened. For example, the folded part of the webbing belt and the tip of the webbing belt If the webbing belt is linear up to the winding part of the spool, further winding of the webbing belt becomes impossible.

  In such a state where the webbing belt cannot be wound, the rotation of the spool in the winding direction is restricted by the tension acting on the webbing belt along the longitudinal direction of the webbing belt. When the spool is subjected to rotation restriction by the webbing belt, the control means stops the driving means.

  Here, in the webbing take-up device according to the present invention, the door is opened and the door open / close detection is detected after the mounting release signal is output until the webbing belt cannot be taken up and the control means stops the drive means. When the release signal is output from the means, the control means restarts the driving means after the control means stops the driving means. When the driving of the driving means is resumed, the driving force of the driving means is transmitted again to the spool, and the spool tries to rotate again in the winding direction.

  For this reason, for example, when the webbing belt is directly or indirectly hooked on the seat, etc., even if the spooling force of the spool due to the normal rotational torque cannot release the hook of the webbing belt on the seat, etc., the normal rotation When the spool rotates with an initial torque larger than the torque, the webbing belt is released from being caught on the seat or the like.

  In this way, in the webbing take-up device according to the present invention, even if the webbing belt is caught on the seat or the like as described above and the webbing belt cannot be taken up temporarily, the driving means is temporarily stopped. In order to drive the driving means again after that, the webbing belt can be retracted from the seat and the webbing belt can be wound around the spool and stored.

  On the other hand, the door is not opened until the webbing belt is unwound and the control unit stops the driving unit after the mounting release signal is output, and the closing signal is output from the door open / close detection unit. In the case of continuing, after the control means stops the driving means, it waits until the door is opened.

  When the door is opened from this state and an opening signal is input from the door opening / closing detection means to the control means, the control means resumes driving of the drive means. When the driving of the driving means is resumed, the driving force of the driving means is transmitted again to the spool, and the spool tries to rotate again in the winding direction.

  As a result, the spool is rotated with an initial torque larger than the normal rotational torque as described above, and the webbing belt can be taken up and stored on the spool by releasing the hook of the webbing belt from the seat or the like.

  Further, as described above, when the closing signal is continuously input to the control means, the drive of the drive means is not resumed until the door is opened even after the first drive means is driven.

  For this reason, even when the webbing belt is directly or indirectly sandwiched between the doors, the webbing belt can be reliably wound and stored when the door is opened. Further, by resuming the winding of the webbing belt when the door is opened, the webbing belt is not directly or indirectly sandwiched between the door and the entrance when the door is closed.

  As described above, in the present invention, even when the webbing belt is directly or indirectly caught on the seat or the like during the first winding of the webbing belt, and the drive unit is thereby stopped, the drive unit is subsequently stopped. The webbing belt can be reliably wound and stored by re-driving.

<Configuration of the present embodiment>
FIG. 1 is a front sectional view schematically showing the overall configuration of a webbing take-up device 10 according to an embodiment of the present invention. FIG. 2 is a front view schematically showing a seat belt device 12 to which the webbing take-up device 10 is applied.

  As shown in FIG. 1, the webbing take-up device 10 includes a frame 20. The frame 20 includes a flat plate 22. The back plate 22 is fixed to the vehicle body by fastening means (not shown) such as a bolt, for example, near the lower end of the center pillar 26 (see FIG. 2) of the vehicle 24. Thus, the webbing take-up device 10 is attached to the vehicle body.

  From both ends in the width direction of the back plate 22, a pair of leg plates 28 and 30 facing each other substantially in the vehicle longitudinal direction are extended in parallel to each other. A substantially cylindrical spool 32 is disposed between the leg plates 28 and 30.

  The spool 32 has an axial direction opposite to the leg plates 28 and 30 and is rotatable around its own axis. In addition, a longitudinal base end portion of a long belt-like webbing belt 34 is locked to the spool 32.

  The webbing belt 34 is wound and accommodated in a layered manner from the base end side on the outer peripheral portion of the spool 32 by rotating the spool 32 in the winding direction which is one of its axes. Further, when the webbing belt 34 is pulled from the front end side, the webbing belt 34 wound around the spool 32 is pulled out, and accordingly, the spool 32 rotates in a pulling direction opposite to the winding direction.

  As shown in FIG. 2, if the webbing take-up device 10 according to the present embodiment is applied to a driver seat or a passenger seat of the vehicle 24, the webbing belt 34 extends along the center pillar 26 of the vehicle 24. Is pulled out substantially upward of the vehicle. A shoulder anchor 36 that constitutes the seat belt device 12 together with the webbing retractor 10 is attached to the vehicle body near the upper end of the center pillar 26. The shoulder anchor 36 is formed with a slit hole 38 that allows the webbing belt 34 to pass therethrough, and the webbing belt 34 drawn out from the spool 32 passes through the slit hole 38 and is folded back substantially downward in the vehicle. .

  Further, as shown in FIG. 2, an anchor plate 40 is attached to the vehicle body in the vicinity of the webbing take-up device 10, and the tip of the webbing belt 34 is locked to the anchor plate 40.

  Further, the tongue plate 42 can be displaced by a predetermined range along the webbing belt 34 between the front end portion of the webbing belt 34 locked to the anchor plate 40 and the folded portion of the webbing belt 34 at the shoulder anchor 36. Is provided. Further, a buckle device 46 is provided on the opposite side of the webbing take-up device 10 and the anchor plate 40 via the seat 44 of the vehicle 24.

  The buckle device 46 is provided so that the front end side of the tongue plate 42 can enter. When the tongue plate 42 enters the inside of the buckle device 46 from the front end side, a latch (not shown) provided inside the buckle device 46 is provided. The tongue plate 42 is engaged to restrict the movement of the tongue plate 42 in the direction of coming out of the buckle device 46.

  On the other hand, as shown in FIG. 1, a torsion shaft 48 is provided coaxially with respect to the spool 32 inside the spool 32. Further, a fitting hole 50 is formed at the end of the spool 32 along the axial direction on the leg plate 28 side. The fitting hole 50 has a substantially circular shape with a cross section substantially coaxial with the spool 32, and the fitting hole 50 has a stepped shape in which the inner diameter dimension gradually increases toward one end in the axial direction.

  On the other hand, a lock mechanism 52 is provided at one axial end of the spool 32. The lock mechanism 52 includes a lock base 54. The lock base 54 includes a fitting portion 56.

  The fitting portion 56 is formed in a substantially columnar shape corresponding to the inner peripheral shape of the fitting hole 50, and the outer dimension is gradually reduced toward the other axial end of the spool 32 (leg plate 30 side). The fitting portion 56 is fitted in the fitting hole 50 so as to be coaxially rotatable relative to the spool 32 inside the fitting hole 50, and the end portion 48A of the torsion shaft 48 on the leg plate 28 side is coaxial and They are connected together.

  The lock mechanism 52 includes a case 58. The case 58 is provided outside the leg plate 28 (that is, opposite to the leg plate 30), and is fixed to the leg plate 28 integrally with the leg plate 28 by fastening means such as screws and fitting means such as fitting claws. ing. Inside the case 58, a member constituting the lock mechanism 52 such as a ratchet gear and a compression coil spring (not shown), and a spiral spring that urges the lock base 54 directly or indirectly in the winding direction are accommodated. Has been.

  The ratchet gear in the case 58 is pivotally supported by the lock base 54 so as to be coaxial with and relative to the spool 32 and the lock base 54. One end of the compression coil spring in the case 58 is locked to the ratchet gear, and the other end is locked to the lock base 54.

  When the urging force of the compression coil spring is increased by the lock base 54 rotating and compressing or pulling the compression coil spring, the compression coil spring urges the ratchet gear in the rotation direction of the lock base 54 by the urging force. The ratchet gear is configured to rotate following the lock base 54.

  Further, the ratchet gear is engaged with the lock plate 60 attached to the lock base 54, and the ratchet gear cannot follow the lock base 54 that is about to rotate in the pull-out direction (that is, the ratchet gear is locked). When the lock plate 60 rotates relative to the base 54 in the winding direction), the lock plate 60 is guided by the ratchet gear and moves outward in the rotational radial direction of the spool 32, and the internal teeth formed on the leg plate 28. The ratchet teeth 62 are engaged with each other. As a result, the rotation of the lock base 54 and consequently the spool 32 in the pull-out direction is restricted.

  Further, an acceleration sensor for the lock mechanism 52 (not shown) is disposed below the ratchet gear in the radial direction. The acceleration sensor includes an engaging claw that can move toward and away from the ratchet gear, a steel ball provided on the opposite side of the engaging claw to the ratchet gear, and a substantially dish-shaped mounting on which the steel ball is placed. And a mounting portion.

  The acceleration sensor for the lock mechanism 52 engages the engagement claw with the ratchet gear when the steel ball rolls on the mounting portion in the vehicle suddenly decelerating state and the steel ball pushes up the engagement claw to move closer to the ratchet gear. To regulate the rotation of the ratchet gear.

  As described above, the ratchet gear rotates following the lock base 54 by the urging force of the compression coil spring. However, when the rotation of the ratchet gear is restricted by the engagement claw of the acceleration sensor engaging the ratchet gear, the ratchet gear A relative rotation occurs between the gear and the lock base 54. Thereby, the lock plate 60 meshes with the ratchet teeth 62 as described above.

  On the other hand, a sleeve 82 is provided at an end 48B of the torsion shaft 48 on the leg plate 30 side. The sleeve 82 is formed in a bottomed cylindrical shape that opens toward the leg plate 28 side, and an end portion 48B of the torsion shaft 48 enters inside thereof, and the torsion shaft 48 and the sleeve 82 are coaxially and integrally connected. Has been.

  A circular hole 84 is formed in the spool 32 corresponding to the sleeve 82. The sleeve 82 is fitted into the circular hole 84 and is connected to the spool 32 coaxially and integrally.

  A shaft portion 86 extends coaxially with respect to the torsion shaft 48 and the spool 32 from the end surface of the sleeve 82 opposite to the torsion shaft 48. The shaft portion 86 passes through a circular hole 88 formed in the leg plate 30 and protrudes outside the leg plate 30.

  A clutch frame 90 is integrally attached to the leg plate 30 on the outside of the leg plate 30 by fastening means such as screws and fixing means such as fitting claws. A clutch 92 is accommodated inside the clutch frame 90. The clutch 92 includes a ring-shaped worm wheel 94. The worm wheel 94 is disposed coaxially with the shaft portion 86.

  Further, one or more pawls are provided inside the worm wheel 94. The pawl is mechanically connected to the worm wheel 94 at a position eccentric from the rotation center of the worm wheel 94, and rotates around the shaft portion 86 together with the worm wheel 94. Further, the pawl can be rotated with respect to the worm wheel 94 about an axis parallel to the shaft portion 86 at a connecting portion with the worm wheel 94.

  Further, an adapter (not shown) is provided on the axial center portion of the worm wheel 94. The adapter is coaxially and integrally connected to the shaft portion 86, and rotates integrally with the shaft portion 86 and eventually the spool 32.

  Further, ratchet teeth are formed on the outer peripheral portion of the adapter, and when the pawl rotates, the tip of the pawl engages with the ratchet teeth on the outer peripheral portion of the adapter. In this engaged state, the worm wheel 94 is mechanically coupled to the shaft portion 86 via the pawl and the adapter, and the rotation of the worm wheel 94 in the winding direction is transmitted to the shaft portion 86 via the pawl and the adapter, so that the shaft The part 86 is structured to rotate in the winding direction.

  On the other hand, as shown in FIG. 1, a motor 100 as a driving unit is provided below the spool 32. The motor 100 is on the opening direction side of the frame 20 in which the output shaft 102 has a substantially concave shape in plan view, that is, on the extending direction side of the leg plates 28 and 30 from the back plate 22, and the tip side thereof is the above clutch. It enters a gear case (not shown) different from the frame 90.

  A spur gear 104 is accommodated in the gear case. The gear 104 is coaxially and integrally attached to the output shaft 102. A spur gear 106 having a sufficiently larger number of teeth than that of the gear 104 is disposed on the side of the rotational radius direction of the gear 104 in the gear case.

  The gear 106 has a rotating shaft 108 in the same direction as the gear 104, and meshes with the gear 104. Further, a spur gear 110 having a sufficiently smaller number of teeth than the gear 106 is coaxially and integrally formed on the gear 106.

  Further, a spur gear 112 having a sufficiently larger number of teeth than the gear 110 is disposed on the side of the gear 110 in the radial direction of rotation in the gear case.

  The gear 112 has a rotating shaft 114 in the same direction as the gears 104 to 112 and meshes with the gear 110. The rotation shaft 114 of the gear 112 protrudes from the gear case and further enters the clutch frame 90.

  In the clutch frame 90, a worm gear 116 is provided coaxially and integrally with the rotating shaft 114 on the rotating shaft 114. The worm gear 116 meshes with the worm wheel 94, and the rotation of the output shaft 102 of the motor 100 is transmitted to the worm gear 116 via the gears 104 to 112, and when the worm gear 116 rotates, Then, the worm wheel 94 rotates.

  On the other hand, as shown in the block diagram of FIG. 4, the motor 100 is electrically connected to the battery 124 via the driver 122, and the motor 100 is driven by being energized via the driver 122 and outputs. The shaft 102 is rotated. The driver 122 is electrically connected to an ECU 126 as control means.

  A drive control signal Ds is output from the ECU 126 to the driver 122. When the drive control signal Ds output from the ECU 126 is input, the driver 122 supplies the current Id to the motor 100 to drive the motor 100.

  As shown in FIG. 4, the ECU 126 is electrically connected to a buckle switch 130 serving as a mounting detection unit, and a signal Bs output from the buckle switch 130 is input to the ECU 126. As shown in FIG. 2, the buckle switch 130 is built in the buckle device 46.

  In a state where the tongue plate 42 is not inserted into the buckle device 46, the buckle switch 130 is in an OFF state, and the signal Bs output from the buckle switch 130 is at a low level. In contrast, when the tongue plate 42 is inserted into the buckle device 46 and the tongue plate 42 is attached to the buckle device 46, the buckle switch 130 is turned on, and the signal Bs is switched from the low level to the high level.

  As shown in FIG. 1, the ECU 126 is electrically connected to a courtesy switch 136 serving as a door opening / closing detection unit, and a signal Cs output from the courtesy switch 136 is input to the ECU 126. As shown in FIGS. 2 and 2, the courtesy switch 136 is provided on the lower side of the door 134 corresponding to the seat 44 (that is, the periphery of the entrance / exit of the vehicle 24).

  In a state where the door 134 closes the entrance / exit, the courtesy switch 136 is in an OFF state, and the signal Cs output from the courtesy switch 136 is at a low level. On the other hand, when the door 134 opens at the entrance / exit, the courtesy switch 136 is turned on, and the signal Cs is switched from the Low level to the High level.

  Further, as shown in FIG. 1, ECU 126 is electrically connected to lock current detection circuit 150, and signal Ls output from lock current detection circuit 150 is input to ECU 126.

  The lock current detection circuit 150 constitutes a drive circuit for the motor 100. When the motor 100 is energized and the output shaft 102 rotates as usual, the lock current detection circuit 150 outputs a low level signal Ls.

  However, if the lock current larger than the normal drive current flows through the drive circuit of the motor 100 due to the rotation of the output shaft 102 being stopped even though the motor 100 is energized, the lock current detection circuit 150 A high level signal Ls is output.

<Operation and effect of the present embodiment>
Next, the operation and effect of the present embodiment will be described through the operation of the webbing take-up device 10.

  In the webbing take-up device 10, if the webbing belt 34 is pulled while pulling the tongue plate 42 while the webbing belt 34 is wound in layers on the spool 32, the webbing belt 34 wound on the spool 32 is pulled out. It is.

  The tongue plate 42 is inserted into the buckle device 46 while the webbing belt 34 pulled out in this way is hung around the front of the occupant seated on the seat 44, and the tongue plate 42 is held by the buckle device 46. The webbing belt 34 is attached to the body (hereinafter simply referred to as “attached state”). In this state, the buckle switch 130 outputs a high level signal Bs.

  Further, when the holding of the tongue plate 42 by the buckle device 46 is released and the tongue plate 42 comes out of the buckle device 46, as shown by the position of the elapsed time T1 in the time chart of FIG. 4 or FIG. The output signal Bs is switched from the high level to the low level.

  On the other hand, the signal Bs output from the buckle switch 130 is input to the ECU 126. In the ECU 126, a webbing storage control program as shown in the flowchart of FIG. 3 is started from the step 200, and after the initial setting such as the resetting of the step 202 flags F1 and F2 is completed, it is input to the ECU 126 in the step 204. It is determined whether or not the signal Bs is at a high level.

  As described above, when the signal Bs is switched from the high level to the low level by releasing the holding of the tongue plate 42 by the buckle device 46, the process proceeds from step 204 to step 206, and the signal Cs from the courtesy switch 136 is set to the high level. Whether the door 134 is open or not is determined.

  In this state, if the door 134 is not opened and the signal Cs from the courtesy switch 136 is at the low level, the process proceeds to step 208, 1 is substituted into the flag F1, and the process proceeds to step 210. On the other hand, if the door 134 is opened and the signal Cs from the courtesy switch 136 is at a high level, the process proceeds directly to step 210 without going through step 208.

  In step 210, a high level drive control signal Ds is output from the ECU 126 (the drive control signal Ds is switched from the low level to the high level).

  Next, the routine proceeds to step 212, where it is determined whether or not the signal Ls output from the lock current detection circuit 150 and input to the ECU 126 is at a high level, and a standby state is maintained until the signal Ls is at a high level.

  When the high-level drive control signal Ds output from the ECU 126 is input to the driver 122, the driver 122 causes the motor 100 to drive by supplying a current Id to the motor 100. When the output shaft 102 rotates by driving the motor 100, the rotation of the output shaft 102 is transmitted to the worm gear 116 via the gears 104 to 112, and the worm gear 116 is rotated.

  Further, the rotation of the worm gear 116 is transmitted to the worm wheel 94 meshing with the worm gear 116 to rotate the worm wheel 94 of the clutch 92 in the winding direction. When the worm wheel 94 rotates in the winding direction, the pawl of the clutch 92 rotates and is connected to the adapter, and the clutch 92 is connected to the shaft portion 86 via the pawl and the adapter.

  Accordingly, when the shaft portion 86 rotates in the winding direction, the spool 32 connected to the shaft portion 86 via the sleeve 82, the torsion shaft 48, and the lock base 54 rotates in the winding direction. As the spool 32 rotates in the winding direction in this way, the webbing belt 34 is wound on the spool 32 from the base end side.

  As described above, when the webbing belt 34 is wound around the spool 32, the tip end side of the webbing belt 34 (that is, the drawing amount of the webbing belt 34) becomes shorter than the portion wound around the spool 32.

  As a result, when the pull-out amount of the webbing belt 34 becomes substantially equal to the shortest distance from the spool 32 through the shoulder anchor 36 to the anchor plate 40, the spool 32 can no longer wind the webbing belt 34 due to the tension of the webbing belt 34. .

  When the rotation of the spool 32 in the winding direction is restricted in this way, the rotation of the output shaft 102 is restricted accordingly. Even when the rotation of the output shaft 102 is restricted, when the drive current Id is supplied to the motor 100, a lock current flows through the motor 100, and the current value of the current flowing through the motor 100 gradually increases.

  When the current value of the lock current flowing through the motor 100 reaches a certain value as shown at the time T2 in the time charts of FIGS. 4 and 5, the signal Ls output from the lock current detection circuit 150 is low. Switch from level to high level.

  When the high-level signal Ls is output from the lock current detection circuit 150, the process proceeds from step 212 to step 214 in FIG. 3, and the drive control signal Ds output from the ECU 120 is switched from the high level to the low level.

  As described above, when the drive control signal Ds output from the ECU 120 and input to the driver 122 is switched from the high level to the low level, the driver 122 stops supplying the drive current Id to the motor 100, thereby Stopped.

  Next, at step 216, it is determined whether 1 is assigned to the flag F2. If it is initialized at step 202 and the flag F2 remains reset, 1 is assigned to the flag F2 at step 218 and the routine proceeds to step 220. In step 220, it is determined whether or not 1 is assigned to the flag F1.

  As described above, when it is determined in step 206 that the signal Cs from the courtesy switch 136 is at the high level, 1 is not assigned to the flag F1. Therefore, in this case, a timer is started at step 222.

  Next, at step 224, it is determined whether or not the count value t in the timer is smaller than a preset count value ts, and a standby state is entered until the actual count value t becomes equal to or greater than the preset count value ts.

  As shown in the state of the elapsed time T3 in the flowchart of FIG. 4, when the actual count value t in the timer becomes equal to or greater than the preset count value ts, the process returns to step 210, and the ECU 126 again drives the high level drive control signal Ds. 4 is output, and as shown in the state of the elapsed time T4 in the flowchart of FIG. 4, the motor 100 until the lock current flows again to the circuit including the motor 100 and the lock current detection circuit 150 outputs the high level signal Ls. Is driven.

  As described above, in the present embodiment, when the webbing belt 34 is stored, the spool 32 is used by the motor 100 until a lock current flows through the motor 100, that is, until it is basically considered that the storage of the webbing belt 34 is completed. Is rotated in the winding direction to temporarily stop the driving of the motor 100, and then the motor 100 is driven again to apply a rotational force in the winding direction to the spool 32.

  For this reason, the tongue plate 42 is temporarily sandwiched between the seat cushion and the seat back of the seat 44, so that the webbing belt 34 is wound up to a state called “all stored” by the first driving of the motor 100. Even if it cannot be removed, the pinching of the tongue plate 42 can be eliminated with the initial torque at the start of driving of the motor 100 for the second time, and the webbing belt 34 is wound up to a state called “all storage”. Can do.

  Next, in step 216, it is determined again whether or not 1 is assigned to the flag F2. In this case, as described above, since 1 is assigned to the flag F2 in step 218, the process proceeds to step 226 and ends.

  On the other hand, if it is determined in step 220 that 1 is assigned to the flag F1 after the first driving of the motor 100 is completed, that is, the door is opened in step 206 before the first driving of the motor 100 is started. If it is determined that the door 134 has not been opened, it is determined again in step 228 whether the door 134 has been opened, and the standby state is maintained until the door 134 is opened and the signal Cs becomes the high level. .

  As shown in the state of the elapsed time T5 in the time chart of FIG. 5, when the door 134 is opened from this state and the signal from the courtesy switch 136 is switched from the Low level to the High level, the process returns to Step 210.

  As described above, when returning to step 210, the high-level drive control signal Ds is output again from the ECU 126, and as shown in the state of the elapsed time T6 in the flowchart of FIG. And the motor 100 is driven until a high level signal Ls is output from the lock current detection circuit 150.

  Next, in step 216, it is determined again whether or not 1 is assigned to the flag F2. In this case, as described above, since 1 is assigned to the flag F2 in step 218, the process proceeds to step 226 and ends.

  In this manner, the tongue plate 42 is sandwiched between the seat cushion of the seat 44 and the seat back in a state where the door 134 is not opened before the first driving of the motor 100 is started, and is referred to as “full storage”. Even if the webbing belt 34 cannot be wound up to a state where it is in a state where the tongue plate 42 is caught by the initial torque at the start of driving of the motor 100 for the second time, a state called “all storage” The webbing belt 34 can be wound up.

  If the door 134 is not opened before the first driving of the motor 100 is started, the driving of the motor 100 is resumed after the door 134 is opened. For this reason, the webbing belt 34 can be smoothly wound up and stored in a state called full storage without the tongue plate 42 and the webbing belt 34 being sandwiched between the door 134 and the peripheral edge of the entrance / exit of the vehicle 24. .

  Furthermore, if the webbing belt 34 is sandwiched between the door 134 and the peripheral edge of the entrance / exit of the vehicle 24 when the driving of the motor 100 is started for the first time, the driving of the motor 100 is resumed in this state. Even so, the webbing belt 34 cannot be wound and stored.

  However, in the present embodiment, as described above, when the door 134 is not opened before the first driving of the motor 100 is started, the driving of the motor 100 is resumed after the door 134 is opened.

  For this reason, even if the webbing belt 34 is sandwiched between the door 134 and the peripheral edge of the entrance / exit of the vehicle 24 at the start of driving of the motor 100 for the first time, when the driving of the motor 100 is resumed, The pinching of the webbing belt 34 between the periphery of the entrance and exit is eliminated. Accordingly, even in such a case, the webbing belt 34 can be reliably wound and stored by restarting the driving of the motor 100.

  In the present embodiment, when the door 134 is opened at the start of driving of the first motor 100, the driving of the motor 100 is resumed after a predetermined time has elapsed since the end of driving of the first motor 100. It was a configuration to let you. However, the configuration may be such that the driving of the motor 100 is resumed immediately after the first driving of the motor 100 is completed, that is, immediately after the motor 100 is temporarily stopped.

It is front sectional drawing which shows the outline of a structure of the webbing winding apparatus which concerns on one embodiment of this invention. It is a front view showing the outline of the composition of the seatbelt device to which the webbing retractor concerning one embodiment of the present invention is applied. It is a flowchart of the process which the control means of the webbing retractor which concerns on one embodiment of this invention performs. It is a time chart which shows the relationship of each signal in case the door is open | released in the state by which mounting | wearing cancellation | release of the webbing belt. It is a time chart which shows the relationship of each signal when a door is opened after the mounting | wearing cancellation | release of a webbing belt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Webbing winding device 24 Vehicle 32 Spool 34 Webbing belt 100 Motor (driving means)
126 ECU (control means)
130 Buckle switch (control means)
134 door 136 courtesy switch (door open / close detection means)
150 Lock current detection circuit

Claims (1)

A webbing that winds the webbing belt around the outer periphery of the spool by rotating a spool, in which the base end of the long belt-like webbing belt is locked, in one winding direction around the axis by the driving force of the driving means. A winding device,
An attachment detection means for detecting whether or not the webbing belt is attached to the body of an occupant and outputting an attachment release signal when the attachment of the webbing belt is released;
Door opening / closing detecting means for detecting opening / closing of a vehicle door, outputting an opening signal when the door is open, and outputting a closing signal when the door is closed;
When the mounting release signal is input, the driving unit is driven to rotate the spool in the winding direction, and the rotation of the spool in the winding direction is restricted to stop the driving unit. And the release signal is input during the period from when the mounting release signal is input to when the driving unit is stopped, so that the driving unit is re-driven after the driving unit is stopped, and the mounting release signal is output. In the case where the closing signal is input during the period from when the driving signal is input to when the driving unit is stopped, the control unit is configured to restart the driving unit after the opening signal is input after the driving unit is stopped. When,
A webbing take-up device comprising:

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