JP4722619B2 - Vehicle seat belt device - Google Patents

Description

  The present invention relates to a seat belt device for a vehicle. In particular, the present invention relates to a vehicle seat belt device having means for tightening webbing in an emergency.

  2. Description of the Related Art Generally, a vehicle seat belt device is provided with an ELR (Emergency Locking Retractor) that locks a webbing from a retractor so that it is difficult to lock when an acceleration of a certain value or more is applied to the vehicle. Further, as a vehicle seat belt device, there is a retractor in which a pretensioner, a road limiter, and the like are added to an ELR.

  The above-described pretensioner has a restraining function that restrains the occupant's body from moving forward by instantaneously winding up the webbing in the initial stage when an impact is applied to the vehicle and taking it loose. The road limiter has an energy absorption function (EA (Energy Absorption) function) that absorbs the kinetic energy of an occupant trying to move inertially by webbing. Various seat belt devices have been proposed in order to control the pretensioner and the road limiter to reduce the feeling of pressure in occupant restraint and to ensure safety.

  As a vehicle seat belt device having an emergency lock mechanism as described above, a vehicle seat belt device that prevents discomfort given to an occupant by unnecessary restraint for a long time has been invented (see, for example, Patent Document 1).

  When the main control unit of the control unit determines that there is a risk of collision, the vehicle seat belt device according to Patent Document 1 rotates the motor in the webbing winding direction to increase the webbing tension. When the main control unit determines that the lock signal is input when the webbing tension reaches a predetermined value, the main control unit continues the webbing winding drive by the motor for a predetermined time. When there is no lock signal input, the driving force of the motor is reduced and the webbing tension is reduced. Thus, even if a collision risk signal is erroneously output from the collision risk determination unit, unless the lock signal is output from the lock signal generation unit, the webbing tension is controlled to be immediately reduced. It is possible to avoid discomfort to the occupant due to unnecessary restraint for a long time.

  On the other hand, as another vehicle seat belt device, a vehicle seat belt device in which webbing can be pulled out by a motor auxiliary pretensioner device of a seat belt device in a timely manner without requiring a special sensor or actuator is invented. (For example, refer to Patent Document 2).

The seat belt device for a vehicle according to Patent Document 2 winds up a webbing by driving a motor provided in the ELR in a forward direction when a collision of the vehicle is predicted, and performs webbing when an acceleration greater than a predetermined value acts on the vehicle. Locks out of ELR. When collision is avoided after the motor of ELR is driven forward by collision prediction and the webbing tension is increased, the vehicle acceleration becomes less than a predetermined value by a plurality of systems having vehicle acceleration information. When it is detected that the ELR is locked, the ELR is unlocked by driving the motor of the ELR in the normal direction to loosen the webbing.
JP 2004-262258 A JP 2004-268661 A

  However, in the seat belt device according to Patent Document 1, for example, when the belt lock mechanism is about to pull out the webbing, the control unit generates a lock signal and supplies it to the control unit in order to detect the locked state. A lock signal generation unit is provided. Thus, there is a problem that adding a new component only to detect the locked state may cause an increase in cost. It is preferable not to increase the number of components leading to an increase in cost.

  In addition, the seat belt device according to Patent Document 2 uniquely releases the webbing lock with a predetermined threshold based on the acceleration of the vehicle. Therefore, if the acceleration fluctuates frequently or the vehicle posture changes frequently while driving on poorly maintained roads or ramps, the acceleration rises again after falling below the fixed threshold. If the predetermined threshold value is exceeded, the lock may not be released properly. Further, due to the above-described fixed threshold value, frequent operation of the webbing in which the locked state or the unlocked state is repeated is unpleasant for the passenger and is not preferable.

  In general, the ELR is composed of a mechanism composed of mechanical elements having high rigidity, and a spindle is wound around one end of the webbing. The ELR includes a lock mechanism that mechanically locks the spindle so as not to rotate in the direction in which the webbing is pulled out when a predetermined acceleration is applied to the vehicle, and prevents the webbing from being pulled out. In Patent Document 2, it is necessary to rotate the spindle by a predetermined amount in the direction in which the seat belt is pulled in order to release the lock state of the lock mechanism.

  For example, when a predetermined acceleration of about 0.3 to 0.45 G is applied, the lock mechanism is activated. After that, when the predetermined acceleration is avoided, it is necessary to release the lock mechanism. However, with only the configuration as described in Document 2, when the acceleration once decreased increases again, the locking mechanism is activated again during or after the release operation, and the webbing restrains the occupant while tension is applied. May cause improper restraint on passengers. In particular, if the acceleration fluctuates due to occupant operations or changes in the posture of the vehicle body after avoiding the prescribed acceleration, such as when driving at high speeds or on poorly maintained roads or steep slopes, the lock mechanism There is a problem that is likely to operate. These can be said to be the problems of the present invention.

  The present invention has been made in view of the problems as described above, and even when acceleration does not converge after avoiding the possibility of a collision, by properly releasing the webbing lock mechanism, restraint that is not appropriate for the occupant. It is an object of the present invention to provide a seat belt device that reduces or prevents webbing from restraining an occupant without releasing a lock mechanism.

(1) A pull or drawable retractor webbing, have a locking mechanism that operates the webbing unwinding difficulties based on a predetermined running state values of the vehicle, of the webbing when releasing the locking mechanism a seat belt device of a vehicle including a retractor that turn the end winding, and the traveling state value detecting means for outputting a running state values of the vehicle, said running state value is input, the running state value input determination means for actuation of the locking mechanism when the first match to the activation threshold, when said determination means determines the operation of the locking mechanism, when said running state value the first match to the actuation threshold below canceling threshold only release threshold of the traveling state value corresponding to the reference speed running speed to release the locking mechanism when higher than the reference speed in the Set so that, only release threshold of the traveling state value the running speed at a point of time when the running state values the first match to the actuation threshold releases the locking mechanism when slower than the reference speed to the reference speed A vehicle seat belt device comprising: setting means configured to set the corresponding release threshold value to be higher than the corresponding release threshold value .

In the seatbelt device according to the invention of (1), when the traveling speed at the time when the traveling state value first matches the operating threshold is faster than the reference speed, only the cancellation threshold of the traveling state value for releasing the lock mechanism is used as the reference speed. Is set to be lower than the release threshold corresponding to . Further, if the traveling speed at the time when the traveling state value first matches the operating threshold is slower than the reference speed, only the traveling state value release threshold for releasing the lock mechanism is set higher than the release threshold corresponding to the reference speed. Set to. As the locking mechanism, various conventionally known locking mechanisms can be used. For example, a locking mechanism that locks and releases the webbing by clamping or releasing the webbing may be used, and a spindle around which one end of the webbing is wound is a solenoid or the like. It is also possible to use a lock mechanism that activates and releases the lock. For example, if the traveling speed is high when the lock mechanism is activated, the release threshold is set based on the prediction that the acceleration of the vehicle will further fluctuate after the time when the lock mechanism should be released. Set smaller than a predetermined threshold. That is, after the predetermined threshold value is passed, the lock mechanism release condition is set so that the lock is not activated even if the acceleration slightly fluctuates. And it can prevent repeating the intermittent of a locking mechanism like the past.

Further, in the prior art, a lock mechanism release signal is transmitted when the traveling speed matches a predetermined threshold regardless of whether the traveling speed at the operation threshold is fast or slow. For example, when the traveling speed is high when a predetermined operating threshold value is exceeded, the acceleration fluctuation of the vehicle caused by the vehicle operation after exceeding the operating threshold value or the disturbance due to the road surface becomes large. Therefore, the acceleration fluctuation after the unlocking condition of the lock mechanism falls below becomes large. If this acceleration swing is large, the possibility of re-locking increases.

On the other hand, when the traveling speed when the operating threshold is exceeded is slow, the vehicle acceleration after exceeding the operating threshold of the locking mechanism or the acceleration of the vehicle caused by road disturbance is reduced. Therefore, the acceleration fluctuation after the release of the lock mechanism is reduced. If this acceleration swing is small, the possibility of re-locking becomes low. Therefore, the higher the traveling speed, the smaller the cancellation threshold value can be set, and the lower the traveling speed, the larger the cancellation threshold value can be set. When the convergence is quick, the lock mechanism can be released at an earlier timing.

( 2 ) The retractor includes a spindle that winds one end of the webbing, and a motor that can rotate the spindle in a direction in which the webbing is retracted, and the lock mechanism is based on a predetermined running state value. The vehicle seat belt device according to (1) , wherein the spindle is locked to make it difficult to pull out the webbing.

The seat belt device according to the invention of ( 2 ) uses a motor pretensioner including a spindle that winds one end of the front webbing and a motor that can rotate the spindle in the direction in which the webbing is pulled in as the unlocking means.

( 3 ) The vehicle seat belt device according to (1) or (2) , wherein the running state value is an acceleration of the vehicle.

The seat belt device according to the invention of ( 3 ) uses the acceleration of the vehicle as the running state value. The acceleration of the vehicle can be easily obtained because it can be obtained from various vehicle body control devices and safety devices mounted on conventional vehicles.

  The seat belt device according to the present invention predicts that, for example, when the traveling speed is high at the time when the locking mechanism is activated, the acceleration of the vehicle further fluctuates after the time for the locking mechanism to be released. Therefore, by setting the release threshold value smaller than the predetermined threshold value, the release condition of the lock mechanism is set so that the lock mechanism does not operate even if the acceleration slightly fluctuates after the release threshold value is exceeded. And it can prevent repeating the intermittent of a locking mechanism like the past.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a functional block diagram showing a configuration of an embodiment of a seat belt device according to the present invention. FIG. 2 is an exploded perspective view of the retractor according to the embodiment.

  FIG. 3 is a graph showing the operation according to the set threshold value in the seat belt device according to the embodiment. 3A is a graph showing a conventional operation, and FIG. 3B is a graph showing an operation according to the present invention.

  FIG. 4 is a graph showing an operation according to the set standby time in the seat belt device according to the embodiment. FIG. 4A is a graph showing the conventional operation, and FIG. 4B is a graph showing the operation according to the present invention.

  FIG. 5 is a graph showing an operation based on a threshold set according to a difference in traveling speed in the seat belt device according to the embodiment. FIG. 5A is a graph showing an operation when the traveling speed is high, and FIG. 5B is a graph showing an operation when the traveling speed is slow.

  First, the configuration of the seat belt device according to the present invention will be described. In FIG. 1, a vehicle seat belt apparatus 100 includes a webbing W and retractors 10 and 11. The retractors 10 and 11 restrain the occupant P by applying a predetermined tension to the webbing W.

  One end of the webbing W is wound around the retractor 10, folded back by a shoulder anchor w <b> 1 near the shoulder of the occupant P and above the center pillar, inserted through the tongue plate w <b> 2, and the other end is center pillar. It is fixed below with an anchor w3. On the other hand, the seat S is provided with a buckle w4 in the vicinity of the waist of the occupant P, and the webbing W is put on by attaching the tongue plate w2 to the buckle w4.

  In FIG. 2, the retractor 10 has a lock mechanism 36 that can pull in or pull out the webbing W and that makes it difficult to pull out the webbing W based on a predetermined running state value of the vehicle. The retractor 10 is provided with a spindle 31 that winds one end of the webbing W, and a pretensioner 1 having a motor M that can rotate the spindle 31 in the direction in which the webbing W is pulled out. In FIG. 1, a control unit 12 that controls the operation of the motor M is interconnected with a traveling state value detection unit 13, a determination unit 14, a display 17, and the like through an in-vehicle LAN.

  In FIG. 1, the determination unit 14 receives a driving state value (for example, acceleration) from a sensor serving as the driving state value detecting unit 13 that outputs a driving state value of the vehicle or another control device provided in the vehicle. The operation of the lock mechanism 36 is determined. The control unit 12 includes a setting unit 12a that sets a release condition of the lock mechanism 36 based on a running state value when the lock mechanism 36 is operated when the determination unit 14 determines the operation of the lock mechanism 36 ( (See FIG. 2).

  In FIG. 2, the retractor 10 includes a spindle 31 around which one end of the webbing W is wound, and a torsion bar 32 incorporated in the spindle 31. The pretensioner 1 mechanically transmits a rotational force driven by the motor M. Is transmitted to the spindle 31. The pretensioner 1 includes a clutch mechanism in which power to the spindle 31 is interrupted by forward / reverse rotation of the motor M, and forward / reverse rotation of the motor M is controlled by the control unit 12 (see FIG. 1).

  In FIG. 1, the determination means 14 for determining the operation of the lock mechanism 36 is connected to the traveling state value detection means 13, and when the determination means 14 determines the operation of the lock mechanism 36 based on the information of these sensor groups, The motor M provided in the pretensioner 1 rotates the spindle 31 around which one end of the webbing W is wound in the direction in which the webbing W is drawn (see FIG. 2).

  In FIG. 2, the pretensioner 1 is disposed on one side of the box-shaped base frame 4. On the side surface of the pretensioner 1, an upper spring cover 5u and a lower spring cover 5d forming a set are provided. A spiral spring 5s is disposed inside the upper spring cover 5u and the lower spring cover 5d. The outer peripheral end of the spiral spring 5s is fixed to the upper spring cover 5u, and the central end of the spiral spring 5s is fixed to the retainer 5r. The retainer 5r is rotatably connected to a central axis of a ratchet gear (not shown) of the pretensioner 1. The central axis of the ratchet gear is detachably connected to a sleeve 33 provided at one end of the central axis of the spindle 31. Usually (during non-operation), the ratchet gear is rotatable, so that the spiral spring 5s can urge the rotational force in the direction in which the spindle 31 winds the webbing W.

  In FIG. 2, a fitting recess (not shown) is provided inside the spindle 31, and one end of the torsion bar 32 is fitted in this fitting recess. The other end of the torsion bar 32 is fitted in a fitting recess 341 formed on one side surface of the tread head 34b. One side surface of the tread head 34b is rotatably connected to the spindle 31 by an EA stopper 34a. A locking element 34c is held in a recess formed on the other side surface of the tread head 34b. The posture of the locking element 34c is regulated by an omega-shaped omega spring 34d. The locking element 34c and the omega spring 34d are held in a sealable manner by a safety plate 34e. The safety plate 34e includes a steering wheel 35a, an internal coupling assembly 35b, and a bearing plate 35c. The bearing plate 35c is covered with a cover 35d.

  With such a configuration, both spindles of the spindle 31 are supported by the upper spring cover 5u and the bearing plate 35c, and the webbing W can be taken up by the urging force of the spiral spring 5s. Further, the urging force of the spiral spring 5s gives a slight tension to the webbing W, and the spindle 31 having such a component is accommodated in the box-shaped base frame 4 (see FIG. 2).

  In FIG. 2, the mechanism is configured such that when a force that pulls out the webbing W suddenly is applied, the engaging claw of the locking element 34c housed in the tread head 34b jumps out. The engaging claw engages with the internal teeth 4g formed on the base frame 4 to constitute a lock mechanism 36 that prevents the tread head 34b from rotating. Specifically, when the acceleration of the vehicle exceeds a predetermined value, the engaging claw of the locking element 34c pops outward by the movement of the ball 36b and engages with the internal teeth 4g formed on the base frame 4. By doing so, the lock mechanism 36 is brought into a locked state. When the lock mechanism 36 is locked, the rotation of the torsion bar 32 is also stopped, and the spindle 31 is allowed to rotate only in response to the twist of the torsion bar 32. The webbing W rotates while receiving tension due to the torsional force of the torsion bar 32. That is, the EA action functions.

  In FIG. 2, the lever 35e and the WS spring 35f are interlocking members for coupling or separating the steering wheel 35a and the bearing plate 35c in conjunction with the internal coupling assembly 35b. Also, in FIG. 2, not all components are illustrated, and are illustrated or described to the extent that the above mechanism can be implemented by those skilled in the art.

  Conventionally, when the release means for releasing the lock mechanism has sent the release signal to the retractor control unit when the acceleration is equal to the predetermined threshold, for example, immediately after releasing the lock mechanism, the lock mechanism again sets the operating condition. When satisfy | filling, the action | operation and cancellation | release of a lock mechanism may be repeated. Therefore, in the present invention, the threshold value for releasing the seat belt locking mechanism is a variation threshold value set in accordance with the running state of the vehicle.

  The seat belt device according to the invention is configured such that the setting means included in the control unit can set the release threshold value of the lock mechanism based on the running state value when the operation threshold value of the lock mechanism is exceeded. In the seat belt device according to the invention, until the setting means included in the control unit exceeds the unlocking threshold value of the locking mechanism based on the running state value when the operating threshold value of the locking mechanism is exceeded, the locking mechanism is released. The standby time can be set.

  Next, the operation of the seat belt device according to the present invention will be described.

  FIG. 3 is a graph comparing the operation of the conventional seat belt device and the seat belt device according to the present invention when the vehicle running state fluctuates, and the solid line in FIG. 3 shows the acceleration as a change in the vehicle running state value. An example using is shown. In FIG. 3, the vertical axis indicates the amount of travel state value (acceleration magnitude) of the vehicle, and the horizontal axis indicates the elapsed time. Note that FIGS. 3A and 3B show acceleration fluctuations under the same traveling conditions.

  In FIG. 3, the acceleration increases due to a collision or a sudden change in vehicle behavior, and the lock mechanism 36 is operated at a time Tf when the acceleration matches the operation threshold Lf. The acceleration further increases beyond the time Tf, and the acceleration attenuates when the peak is exceeded. For example, in a situation where the vehicle is traveling on a poorly maintained road and the fluctuation of acceleration is severe, as shown in FIG. 3, the once-decreased acceleration starts to rise again, and the pulsation converges over time while repeating the pulsation. . The operation threshold Lf is a fixed value that is arbitrarily set, for example, in the range of 0.3 to 0.45 G.

  In the case of the above-described fluctuation, as shown in FIG. 3A, the release signal to the retractor 10 at the time Tc when the acceleration that has dropped after the peak coincides with a predetermined release threshold Lc. Is transmitted and the webbing W is unlocked. However, as shown in FIG. 3 (A), the acceleration once lowered starts to rise again, and coincides with the operation threshold Lf at the re-inversion peak indicated by the arrow RL in the figure, and the webbing W is locked again. For this reason, the locking of the webbing W is repeated intermittently in a short time, and such an operation is unpleasant for the passenger and is not preferable.

  On the other hand, in the seat belt device according to the present invention, as shown in FIG. 3B, fluctuation (time change), dispersion, etc. based on the output of the detection means (for example, acceleration sensor) when the operation threshold Lf is exceeded. Is set by estimating the subsequent fluctuation amount. It is desirable to set the threshold value to be lower as the fluctuation amount is estimated to be larger. In FIG. 3, it is determined that the subsequent fluctuation amount is larger than normal, and a release threshold Ld smaller than a predetermined release threshold Lc corresponding to the release threshold at normal time is set. With such a configuration, the webbing W is not re-locked at the second peak where the acceleration is reversed and increased. In FIG. 3B, the acceleration is approximately equal to the release threshold Ld at which the acceleration is set at a time Td toward convergence.

  As shown in FIG. 3B, by controlling the retractor, the lock mechanism 36 is driven by an unstable state of the vehicle, for example, during high-speed traveling or traveling on poorly maintained roads or steep slopes. Even if the lock mechanism 36 is released after the unstable operation is avoided and the lock mechanism 36 is released, the lock mechanism 36 does not operate again due to a change in acceleration caused by a subsequent occupant operation or a change in the posture of the vehicle body. Can run smoothly.

  FIG. 4 is a graph comparing the operation of the conventional seat belt device and the seat belt device according to the present invention when the vehicle running state fluctuates, and the solid line in FIG. 4 indicates the same vehicle running state value as in FIG. An example is shown in which acceleration is used as the change in. In FIG. 4, the vertical axis represents the vehicle driving state value amount (acceleration magnitude), and the horizontal axis represents the elapsed time. FIG. 4A and FIG. 4B show acceleration fluctuations under the same traveling conditions.

  In FIG. 4, the acceleration increases due to a collision or a sudden change in vehicle behavior, and the lock mechanism 36 is operated at a time Tf when the acceleration matches the operation threshold Lf. The acceleration further increases beyond the time Tf, and the acceleration attenuates when the peak is exceeded. For example, in a situation where the vehicle is traveling on a poorly maintained road and the acceleration varies greatly, as shown in FIG. 4, the once-decreased acceleration starts to rise again, and the pulsation eventually converges while repeating the pulsation. . The operation threshold Lf is a fixed value that is arbitrarily set, for example, in the range of 0.3 to 0.45 G.

  In the case of the above-described fluctuation, as shown in FIG. 4A, the release signal to the retractor 10 at the time Tc when the acceleration that has dropped after the peak coincides with a predetermined release threshold Lc. Is transmitted and the webbing W is unlocked. However, as shown in FIG. 4 (A), the acceleration once lowered starts to rise again, and coincides with the operation threshold Lf at the re-inversion peak indicated by the arrow RL in the figure, and the webbing W is locked again. For this reason, the locking of the webbing W is repeated intermittently in a short time, and such an operation is unpleasant for the passenger and is not preferable.

  In the seat belt device according to the present invention, as shown in FIG. 4 (B), the amount of subsequent fluctuation is calculated from fluctuation or dispersion based on the output of the detection means (for example, acceleration sensor) when the operation threshold value Lf is exceeded. Set by guessing. It is desirable to set the waiting time to be longer as the fluctuation amount is estimated to be larger. In FIG. 4, it is determined that the subsequent fluctuation amount is larger than normal, and a standby time Lth from when the predetermined release threshold Lc is exceeded until the release signal is transmitted is set. With such a configuration, the webbing W is not re-locked at the second peak where the acceleration is reversed and increased. In FIG. 4B, a release signal for releasing the lock mechanism 36 is transmitted at a time Td when the acceleration tends to converge.

  The seat belt device according to this embodiment can set the time until the fluctuation converges after falling below a predetermined threshold value. For example, when it is foreseen that there are many fluctuations in the traveling speed, a long standby time from when the predetermined release threshold is exceeded until the release signal is sent is set. Then, it waits until the fluctuation converges and sends a release signal. On the other hand, when it is predicted that the time until the fluctuation converges is short, the waiting time until the release signal is transmitted after the predetermined release threshold is exceeded is set to be long and short. And it can prevent repeating the interruption of a lock like the past.

  In the above embodiment, the case where the release threshold value is set based on the detected traveling state value and its variation, and the case where the standby time until the release operation is set have been described. For example, the device can set the release threshold or set the standby time based on the output of the traveling speed of the vehicle when the traveling state value exceeds the operation threshold.

  FIG. 5A shows the transition of acceleration when the traveling speed of the vehicle is high when the acceleration increases due to a collision or a sudden change in vehicle behavior, and the acceleration matches the operation threshold Lf. In such a case, as shown in the figure, the amount of fluctuation in acceleration due to disturbance or occupant operation increases.

  FIG. 5B shows the transition of acceleration when the vehicle traveling speed is slow when the acceleration increases due to a collision or a sudden change in vehicle behavior, and the acceleration matches the operating threshold Lf. In such a case, the amplitude of acceleration fluctuation is small as shown in the figure, and the time to convergence is also short.

  When the acceleration of the vehicle coincides with the operation threshold Lf, for example, when it is detected that the traveling speed of the vehicle is faster than normal, the cancellation threshold Ld is set to be smaller than the normal cancellation threshold Lc (see FIG. 5A). ). On the other hand, when it is detected that the traveling speed of the vehicle is slower than normal, the vehicle is set to a release threshold Ld (Lf> Ld) larger than the normal release threshold Lc (see FIG. 5B). As described above, by setting the release threshold Ld, it is possible to suppress the influence of fluctuation due to the running state of the vehicle or the operation state of the vehicle. Further, the lock mechanism 36 can be released at a more appropriate timing.

  Further, when the acceleration of the vehicle coincides with the operation threshold Lf, for example, when it is detected that the traveling speed of the vehicle is faster than normal, the standby time Tth from the normal release threshold Lc is set longer (FIG. 5 ( A)). On the other hand, when it is detected that the running speed of the vehicle is slower than normal, the normal release threshold value Lc is moved forward to a new release threshold value Ld, and the waiting time Tth from the release threshold value Ld is set short (FIG. 5). (See (B)). It is possible to combine these methods. In other words, the threshold is set according to the speed, and after the set release threshold is exceeded, the release operation is performed after the standby time according to the speed, and the release condition is set to be more realistic. I can do it.

  The seat belt device according to the configuration of this embodiment detects the traveling speed of the vehicle when the operation threshold is exceeded, and sets the waiting time until the operation signal is transmitted from the detected value as appropriate. Occurrence of re-locking can be suppressed.

It is a functional block diagram which shows the structure of one Embodiment of the seatbelt apparatus by this invention. It is a perspective exploded view of the retractor according to the embodiment. It is a graph which shows the operation | movement by the set threshold value in the seatbelt apparatus by the said embodiment. It is a graph which shows the operation | movement by the set standby time in the seatbelt apparatus by the said embodiment. It is a graph which shows the operation | movement by the threshold value set by the difference in driving speed in the seatbelt apparatus by the said embodiment.

Explanation of symbols

10.11 Retractor 12 Control unit 12a (Release condition) setting means 14 Judging means 100 Seat belt device M Motor W Webbing

Claims (3)

A retractable or extendable retractor webbing winding one end of the webbing when have a locking mechanism that operates the webbing unwinding difficulties based on a predetermined running state values of the vehicle, to release the locking mechanism a seat belt device of a vehicle including a retractor that turn,
Driving state value detecting means for outputting the driving state value of the vehicle;
Determination means for determining the operation of the lock mechanism when the travel state value is input and the input travel state value first matches an operation threshold ;
When the determination means determines the operation of the locking mechanism, the traveling state value for releasing the locking mechanism when the traveling speed at the time when the traveling state value first matches the operation threshold is faster than a reference speed . releasing the locking mechanism when only release threshold set to lower than the release threshold corresponding to the reference speed, the traveling speed at the time of the running state values the first match to the actuation threshold is lower than the reference speed Setting means for setting only the cancellation threshold of the running state value to be higher than the cancellation threshold corresponding to the reference speed ;
A vehicle seat belt device comprising: The retractor includes a spindle that winds one end of the webbing, and a motor that can rotate the spindle in a direction in which the webbing is retracted.
2. The seat belt device for a vehicle according to claim 1 , wherein the lock mechanism locks the spindle so that it is difficult to pull out the webbing based on a predetermined running state value. The vehicle seat belt device according to claim 1 , wherein the running state value is an acceleration of the vehicle.

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