JP2018167604A - Seat Belt Device - Google Patents

Abstract

To provide a seat belt device that can appropriately protect an occupant at a timing close to the end of self-driving.SOLUTION: A seat belt device 1 is schematically configured to include a control unit 24. For example, the control unit controls at least one tension adjustment part configured to adjust a tensile force of a webbing 10, and gives warning by applying a first tensile force to the webbing 10 by input of a trigger signal Sfor waning that self-driving is close to the end. Thereafter, a determination is made such that a restriction to an occupant 9 is to be increased without satisfaction of a preliminarily-set first condition. In such a case, the control unit applies a second tensile force greater than the first tensile force to the webbing 10 and thereby increases the restriction to the occupant 9. In addition, when a preliminarily-set second condition is satisfied during the application of the second tensile force, the control unit stops the application of the second tensile force.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seat belt device.

  Conventional technologies include an automatic control standby mode that is selected by a cruise control switch and waits for the start of the apparatus, a constant speed traveling mode that controls the engine control mechanism to match the set target vehicle speed, and a preceding vehicle. For vehicles that have a follow-up running mode that controls to keep the distance between vehicles and transition to the automatic control standby mode regardless of the driver's will if the vehicle speed falls below a predetermined value in the constant speed running mode or the following running mode A travel control device is known (for example, refer to Patent Document 1).

  This vehicle travel control device drives a seat belt actuator in a pattern in addition to an alarm buzzer when transitioning to an automatic control standby mode regardless of the driver's will. Therefore, when the vehicle travel control device shifts to the automatic control standby mode regardless of the driver's intention, even if the driver is in a state of reduced consciousness, the vehicle travel control device restrains the driver to the driver's seat and guides it to a safer side be able to.

JP 2007-22285 A

  However, the conventional vehicle travel control device does not drive the seat belt actuator if the vehicle speed is equal to or higher than the specified value, so the driver cannot be restrained at the driver's seat at an appropriate timing before or after the automatic operation is completed. If another vehicle or object collides before and after the vehicle finishes, the driver (occupant) may not be properly protected.

  Accordingly, an object of the present invention is to provide a seat belt device capable of appropriately protecting an occupant at a timing when the end of automatic driving is near.

  According to one aspect of the present invention, at least one tension adjusting unit that adjusts the tension of the webbing is controlled, and a warning is given by applying a first tension to the webbing by inputting a trigger signal for warning that the end of automatic operation is near. When the determination is made to increase the occupant restraint without satisfying the first predetermined condition, the second restraint greater than the first tension is applied to the webbing to restrain the occupant. Provided is a seatbelt device having a control unit that stops the application of the second tension when a predetermined second condition is satisfied while the second tension is applied while enhancing the performance. .

  According to the present invention, it is possible to appropriately protect an occupant at the timing when the automatic driving is almost finished.

FIG. 1A is a schematic side view of a vehicle on which an example of a seat belt device according to the first embodiment is mounted, and FIG. 1B is an outline for explaining an example of a seat belt device. FIG. FIG. 2A is an example of a block diagram of the seat belt device according to the first embodiment, and FIG. 2B is an example of a block diagram of a vehicle communication system including the seat belt device. FIG. 3 is a flowchart showing an example of the operation of the seat belt device according to the first embodiment and the second embodiment.

(Summary of embodiment)
The seat belt device according to the embodiment controls at least one tension adjusting unit that adjusts the tension of the webbing, and applies a first tension to the webbing by inputting a trigger signal for warning that the automatic operation is almost finished. After giving a warning and giving a determination that increases the restraint of the occupant without satisfying the first predetermined condition, a second tension larger than the first tension is applied to the webbing. The control system is configured to have a control unit that increases the restraint of the occupant and stops the application of the second tension when a predetermined second condition is satisfied while the second tension is applied. ing.

  The seat belt device applies a first tension to the webbing for a warning indicating that the end of automatic driving is near, and further applies a second tension when it is determined that the occupant's restraint should be increased. Therefore, the occupant can be appropriately protected at a timing close to the end of automatic driving as compared with the case where this configuration is not adopted.

[First embodiment]
(Outline of the seat belt device 1)
FIG. 1A is a schematic side view of a vehicle on which an example of a seat belt device according to the first embodiment is mounted, and FIG. 1B is an outline for explaining an example of a seat belt device. FIG. FIG. 2A is an example of a block diagram of the seat belt device according to the first embodiment, and FIG. 2B is an example of a block diagram of a vehicle communication system including the seat belt device. Note that, in each drawing according to the embodiment described below, the ratio between figures may be different from the actual ratio. 2A and 2B, main signals and information flows are indicated by arrows. Furthermore, “A to B” indicating a numerical range is used in the meaning of A or more and B or less.

  The seat belt device 1 is disposed in a vehicle 8, for example, as shown in FIGS. 1 (a) and 1 (b). And the vehicle 8 is comprised so that automatic driving | operation which moves self to the destination is possible. The seat belt device 1 is configured to protect the occupant 9 in connection with this automatic driving. The seat belt device 1 may be configured to interlock with a seat belt device disposed in a passenger seat or the like and appropriately protect other occupants.

For example, as shown in FIGS. 1A to 2B, the seat belt device 1 controls at least one tension adjusting unit that adjusts the tension of the webbing 10, and the automatic operation is almost finished. after warning by applying a first tension to the webbing 10 by the input of the trigger signal S ₄ for alerting, was determined to improve the restraining of the passenger 9 is not satisfied the first condition to a predetermined In this case, a second tension larger than the first tension is applied to the webbing 10 to enhance the restraint of the occupant 9, and a second condition that is set in advance while the second tension is applied is When it is satisfied, the control unit 24 is configured schematically to stop applying the second tension.

The control unit 24 mainly includes _a first retractor 12 as a first tension adjusting unit that adjusts a tension Ta of the shoulder belt portion 10a of the webbing 10 that restrains the upper body of the occupant 9, and a waist portion of the occupant 9 mainly. the tension of the second second retractor 14, and the tongue plate 20 drives the buckle 22 to bind the lap belt portion 10b of the tension adjusting unit for adjusting the tension T _b of the lap belt portion 10b of the webbing 10 for restraining a even not a few of the buckle driving unit 16 as a third tension adjusting unit for adjusting the T _b is configured to impart a first tension and the second tension by controlling, and one.

Trigger signal _{S 4,} for example, as shown in FIG. 2 (b), is output from the automatic driving controller 803. The trigger signal S _4, for example, when the end of automatic operation is close, if as a result of a malfunction of the sensor can not be automatically operated normally, is output to when there is a possibility that it becomes impossible travel to the destination . This warning is intermittently performed for several seconds as an example.

That is, the control unit 24 outputs the trigger signal S ₄ indicating that the end of the automatic driving output from the automatic driving control device 803 is near. trigger signal S ₄ indicating _that, and the end of automatic operation is configured to perform a warning based on at least one of the trigger signal S ₄ indicating that close by the detection of a failure of the vehicle 8.

  Close to the end of automatic driving means that, for example, the distance to the destination where automatic driving is instructed is shorter than the determined distance, or the time until the end of automatic driving is the determined time. It is shown that.

For example, the determined distance is longer when the vehicle 8 is traveling on a highway than when traveling on a general road. The determined distance is, for example, about 1 to 10 km. Automatic driving controller 803, as an example, the distance to the destination is less than approximately 3 km, the end of automatic operation is to output a trigger signal S ₄ as close.

The determined time is, for example, 1 to 10 minutes. Automatic driving controller 803, as an example, if the time to reach the destination becomes approximately 5 minutes, the end of automatic operation is to output a trigger signal S ₄ as close.

  The case where the automatic driving cannot be normally performed is, for example, automatic such as a vehicle speed sensor that measures the speed of the vehicle 8, a steering angle sensor that detects the steering angle of the steering 86, and an inter-vehicle distance sensor that measures the distance to surrounding vehicles and objects. This indicates that necessary functions have been lost during operation. In this case, the automatic operation control device 803 immediately gives a warning when a necessary function is lost.

  There is a possibility that it may not be possible to travel to the destination. In the case of an electric vehicle, the remaining battery level may be insufficient. In the case of a vehicle that uses fuel such as gasoline or light oil, This is the case when there is a possibility that the remaining amount is insufficient. In this case, the automatic operation control device 803 may warn a few kilometers before the destination.

Automatic driving controller 803, as described above, by outputting a trigger signal S _4, is configured to perform a warning to the occupant 9. The seat belt device 1 gives a warning to the occupant 9 giving first tension to the webbing 10 by the input of the trigger signal S _4. The warning may be given, for example, by giving the first tension for a predetermined time, or may give the first tension intermittently for a time decided according to the decided pattern. As an example, the warning according to the present embodiment is to give the first tension for a predetermined time.

  When it is assumed that another vehicle or an object collides, the control unit 24 sets the first condition that the impact on the occupant 9 is reduced.

  Specifically, the control unit 24 uses the occupant monitoring device 804 mounted on the vehicle 8 when the gripping sensor 805 mounted on the vehicle 8 does not detect gripping of the steering 86 of the occupant 9 for a predetermined period. The first condition is that it is determined that the occupant 9 is in a drivable state and the vehicle 8 is in a dwellable state within a predetermined time. The seat belt device 1 acquires the detection result of gripping, the state of the occupant 9, and the like from an electronic device connected to the vehicle communication system 800.

  Note that the predetermined period is 1 to 5 seconds as an example.

  As an example, the vehicle communication system 800 includes a seat belt device 1, a vehicle control device 801, a surroundings monitoring device 802, an automatic operation control device 803, an occupant monitoring device 804, and a grip sensor 805 via a vehicle LAN (Local Area Network) 806. Configured to communicate.

  The vehicle control device 801 comprehensively controls, for example, an electronic device mounted on the vehicle 8, a vehicle LAN 806, and the like. The surroundings monitoring device 802 calculates, for example, a distance to an object approaching the vehicle 8 by using an inter-vehicle distance sensor, a camera, or the like, and outputs it to the vehicle control device 801 or the automatic driving control device 803. For example, the automatic driving control device 803 controls the drive source of the vehicle 8 so that automatic driving to a designated destination is possible. The occupant monitoring device 804, for example, images the occupant 9 with the camera 804a, analyzes the captured image, and monitors the posture of the occupant 9 and the like. The grip sensor 805 is disposed on the steering 86, for example, and detects the grip of the steering 86 by the occupant 9.

Automatic driving controller 803 outputs, for example, a trigger signal _{S 4} and the vehicle information _{S 5} to the seat belt apparatus 1. Vehicle information S _5, for example, whether the vehicle 8 is in a stopped state within a predetermined time, i.e. is information indicating whether or not to reach the possible locations stopped within a predetermined time . For example, the predetermined time is about several minutes.

(Configuration of webbing 10)
The webbing 10 is a belt-like belt made of polyester or the like. For example, as shown in FIGS. 1A and 1B, the webbing 10 is disposed in a pillar 85 and is passed through an anchor 18 attached to the pillar 85. A tongue plate 20 that can freely move the webbing 10 is attached to the webbing 10. The tongue plate 20 is configured to be coupled to the buckle 22 disposed on the seat portion 81 of the seat 80.

(Configuration of the first retractor 12)
The 1st retractor 12 is arrange | positioned at the pillar 85 of the vehicle 8, as shown to Fig.1 (a) and FIG.1 (b), for example. The first retractor 12 includes a spool and a motor that rotates the spool. One end of the webbing 10 is attached to the spool. The motor can take up and send out the webbing 10 by rotating the spool.

For example, as shown in FIG. 2A, the first retractor 12 is configured so that the webbing 10 can be wound and sent out by the drive signal S ₁ output from the control unit 24. The first retractor 12, by feeding the winding of the webbing 10 mainly it is possible to adjust the tension T _a of the shoulder belt portion 10a.

Load _{F 1} occupant 9 feels the upper body is mainly proportional to the tension _{T a} of the shoulder belt portion 10a. That is, the occupant by the tension T _a of the shoulder belt portion 10a, the load F ₁ as pressed against the seat back 82 of the sheet 80 is applied.

Thus the first retractor 12 is to increase the tension T _a by winding the webbing 10 increases the load F _1, by reducing the tension T _a decreases the load F ₁ by feeding. In this way, by applying an appropriate load F ₁ by the first retractor 12, the upper body of the occupant 9 is supported by the seat back 82 and the head is supported by the headrest 83.

(Configuration of the second retractor 14)
The second retractor 14 is disposed on the right side of the occupant 9 of the seat portion 81 of the seat 80, for example, as shown in FIGS. 1 (a) and 1 (b). The second retractor 14 includes a spool and a motor that rotates the spool. The other end of the webbing 10 is attached to this spool. The motor can take up and send out the webbing 10 by rotating the spool.

For example, as shown in FIG. 2A, the second retractor 14 is configured so that the webbing 10 can be wound and sent out by the drive signal S < _b > ₂ output from the control unit 24. The second retractor 14, the feeding and winding of the webbing 10 can be primarily for adjusting the tension T _b of the lap belt portion 10b.

Load _{F 2} the passenger 9 feels the waist is mainly proportional to the tension _{T b} of the lap belt portion 10b. That is, the occupant by the tension T _b of the lap belt portion 10b, the load F ₂ of being pressed to the seat 81 of the seat 80 is applied. Thus the second retractor 14 is to increase the tension T _b by winding the webbing 10 increases the load F _2, by reducing the tension T _b reduces the load F ₂ by feeding.

The seat belt apparatus 1 of this embodiment, as described below, can also adjust the tension T _b of the lap belt portion 10b by further buckle driving unit 16.

Note first retractor 12 and second retractor 14, for example, the sensor may be disposed for detecting the tension T _a and the tension T _b of the webbing 10, such as by monitoring the motor current.

(Configuration of buckle drive unit 16)
For example, as shown in FIG. 1B, the buckle driving unit 16 is connected to the buckle 22 via a wire 16a. The wire 16 a extends downward from the buckle 22, is hung on the guide 16 b, extends forward of the vehicle 8, and is connected to the buckle driving unit 16.

Buckle driver 16, for example, pushing the wire 16a to move to the rear of the vehicle 8 on the basis of the drive signal S ₃ output from the control unit 24, and pulling to move to the front of the vehicle 8 buckle 22 Move up and down. By the buckle 22 is moved upward, the tension T _b is reduced in the lap belt portion 10b, by moving downward, the tension T _b increases.

  As a modification, for example, the buckle 22 may be configured such that the guide 16b moves in the front-rear direction when the guide 16b moves in the front-rear direction of the vehicle 8.

(Configuration of control unit 24)
The control unit 24 includes, for example, a CPU (Central Processing Unit) that performs operations and processes on acquired data according to a stored program, a RAM (Random Access Memory) that is a semiconductor memory, a ROM (Read Only Memory), and the like. Microcomputer. In this ROM, for example, a program for operating the control unit 24 is stored. For example, the RAM is used as a storage area for temporarily storing calculation results and the like.

The control unit 24 is configured to generate and output drive signals S ₁ to S ₃ that control the first retractor 12, the second retractor 14, and the buckle drive unit 16.

Control unit 24 of the present embodiment, for example, be configured to alert the tension T _a shoulder belt portion 10a controls the first retractor 12 when the trigger signal S ₄ is inputted given as a first tension ing.

As a modified example, the control unit 24 controls at least one of the second retractor 12 and the buckle driving unit 16, and sets the tension T _a of the shoulder belt unit 10a and the tension T _b of the lap belt unit 10b to the first tension. It may be configured to give as In this modification, the occupant 9 is more restrained and can protect the occupant 9 more appropriately.

  In addition, after the warning is performed, the control unit 24 applies a second tension larger than the first tension to the shoulder belt portion 10a to increase the restraint of the occupant 9 when the first condition is not satisfied. It is configured as follows.

  That is, when the occupant 9 is in an inoperable state because the consciousness level is lowered due to sleep or illness during automatic driving, the control unit 24 reduces the impact caused by the collision of other vehicles or objects that may occur. The restraint property of 9 is improved.

Control unit 24 determines the grip of the steering 86 based on the grasped information S ₆ obtained from the grip sensor 805. The gripping information S ₆ includes, for example, whether the information gripping is performed. Note that the grip sensor 805 is, for example, a capacitive touch sensor.

The control unit 24 determines whether the impossible whether operable on the basis of the occupant information S ₇ obtained from the occupant monitoring device 804. For example, the occupant monitoring device 804 cannot drive when the steering wheel 86 is gripped, but is in a posture that covers the steering wheel 86, leans against a door, or leans greatly toward the passenger seat. It is determined that This occupant information S _7, whether a possible driving position, contains a whether a impossible driving posture information.

  Below, an example of operation | movement of the seatbelt apparatus 1 of this Embodiment is demonstrated according to the flowchart of FIG.

(Operation)
Control unit 24 of the seat belt device 1, automatic operation, monitors whether the trigger signal S ₄ is inputted. Control unit 24, "Yes" is established in step 1, that is, when the trigger signal _{S 4} is inputted (Step1: Yes), starts the warning (Step2). Control unit 24, for performing the warning, so that the first tension is applied to the shoulder belt portion 10a, and outputs the driving signals S ₁ to the first retractor 12.

After the warning, the control unit 24 is based on the grip information S ₆ output from the grip sensor 805, the occupant information S ₇ output from the occupant monitoring device 804, and the vehicle information S ₅ output from the automatic operation control device 803. To check whether the first condition is satisfied.

When the first condition is not satisfied, that is, when the gripping of the steering wheel 86 of the occupant 9 is not detected for a predetermined period, the control unit 24 is in an inoperable state and the vehicle 8 is determined in advance. was not in the stopped state in time (Step3: no), as greater than the first tension second tension is applied to the shoulder belt portion 10a, outputs the driving signals S ₁ to the first retractor 12 (Step 4).

Next, the control unit 24 grips the steering 86 of the occupant 9 or the drivable state of the occupant 9 based on the grip information S ₆ output from the grip sensor 805 and the occupant information S ₇ output from the occupant monitoring device 804. If but is detected, i.e. if the second condition is satisfied (Step5: Yes), and terminates the processing stops the application of the second tension to stop the output of the driving signal _{S 1} (Step6). For example, the control unit 24 may stop applying the second tension after a certain period of time even if the vehicle 8 stops and the second condition is not satisfied.

  Here, in Step 3, when the first condition is satisfied (Step 3: Yes), the control unit 24 ends the process.

  In step 5, if the second condition is not satisfied (Step 5: No), the control unit 24 proceeds to step 4 and continuously applies the second tension to restrain the occupant 9.

(Effects of the first embodiment)
The seat belt device 1 according to the present embodiment can appropriately protect the occupant 9 at the timing when the end of automatic driving is near. Specifically, the seatbelt device 1 increases the restraint of the occupant 9 when the occupant 9 does not satisfy the first condition after giving a warning indicating that the end of automatic driving is approaching. Accordingly, the seat belt device 1 appropriately restrains the occupant 9 even when the occupant 9 does not grip the steering wheel 86 and is in an inoperable state. In the case of a collision, the occupant 9 can be appropriately protected compared to a case where this configuration is not adopted.

  Since the seat belt device 1 can be returned to an appropriate posture when it is covered with the steering 86, the impact due to the operation of the airbag caused by the collision can be reduced compared to the case where this configuration is not adopted. Can do.

  Since the seat belt device 1 stops applying the second tension when the second condition is satisfied, the discomfort of the occupant 9 can be suppressed compared to a case where this configuration is not employed.

[Second Embodiment]
The second embodiment is different from the first embodiment in that the restraint is enhanced when the posture is not appropriate even when the steering 86 is gripped.

  The control unit 24 according to the present embodiment sets the first condition that the monitoring result of the posture of the occupant 9 by the occupant monitoring device 804 mounted on the vehicle 8 is an appropriate posture. In other words, for example, the control unit 24 is in an appropriate posture when it is in a posture that covers the steering wheel 86 even when the steering wheel 86 is gripped, leans against a door, or leans greatly toward the passenger seat. However, the restraint of the occupant 9 is enhanced by the second tension.

  Hereinafter, an example of the operation of the seat belt device 1 according to the present embodiment will be described with reference to the flowchart of FIG.

(Operation)
Control unit 24 of the seat belt device 1, when "Yes" in Step 1 is the trigger signal _{S 4} is inputted satisfied (Step1: Yes), starts the warning (Step2).

After warning completion, the control unit 24, first checking whether a condition is satisfied based on the occupant information S ₇ output from the occupant monitoring device 804.

When the first condition is not satisfied, that is, when the occupant 9 is not in an appropriate posture and is in an inoperable state (Step 3: No), the second tension greater than the first tension is the shoulder belt portion. as applied to 10a, and outputs the driving signals _{S 1} to the first retractor 12 (Step4).

Next, the control unit 24, if the second condition is satisfied (Step5: Yes), and terminates the processing stops the application of the second tension to stop the output of the driving signal _{S 1} (Step6).

  Here, in Step 3, when the first condition is satisfied (Step 3: Yes), the control unit 24 ends the process.

  In step 5, if the second condition is not satisfied (Step 5: No), the control unit 24 proceeds to step 4 and continuously applies the second tension to restrain the occupant 9.

(Effect of the second embodiment)
The seatbelt device 1 according to the present embodiment has a posture in which the occupant 9 covers the steering wheel 86 even when the steering wheel 9 is gripping, leans against a door, or leans greatly toward the passenger seat. Since the restraint is enhanced, the occupant 9 can be appropriately protected as compared with the case where this configuration is not adopted. Further, since the seat belt device 1 can be returned to an appropriate posture when it is covered with the steering 86, compared with a case where this configuration is not adopted, the impact due to the operation of the airbag due to the collision is reduced. be able to.

[Third Embodiment]
The third embodiment is different from the other embodiments in that the restraint is improved even after the vehicle 8 stops.

  The control unit 24 of the seat belt device 1 according to the present embodiment detects the approach of another vehicle or an object while the vehicle 8 is stopped by the surroundings monitoring device 802 mounted on the vehicle 8, and is mounted on the vehicle 8. When the result of monitoring the posture of the occupant 9 by the occupant monitoring device 804 is not an appropriate posture, the occupant's restraint is improved.

  That is, for example, the control unit 24 does not stop the vehicle 8 even if the vehicle 8 stops in a state where the first condition is satisfied and the second tension is not applied in the first embodiment or the second embodiment. The monitoring of the periphery of 8 and the monitoring of the occupant 9 are continued, and when the approach of another vehicle or object is detected and the posture of the occupant 9 is not an appropriate posture, the restraint of the occupant 9 is enhanced.

  As a modification, the control unit 24 detects the approach of another vehicle or object after the vehicle 8 is stopped and the applied second tension is stopped after a predetermined time, and the posture of the occupant 9 is changed. If the posture is not appropriate, the restraint of the occupant 9 may be increased.

(Effect of the third embodiment)
The seat belt device 1 of the present embodiment can appropriately restrain the occupant 9 at the timing before and after the end of automatic driving.

  As another embodiment, the seat belt device 1 may be configured as a seat belt system together with the surrounding monitoring device 802, the automatic operation control device 803, the occupant monitoring device 804, and the grip sensor 805.

  According to the seat belt device 1 of at least one embodiment described above, it is possible to appropriately protect the occupant at the timing when the automatic operation is almost finished.

  As mentioned above, although some embodiment and modification of this invention were demonstrated, these embodiment and modification are only examples, and do not limit the invention based on a claim. These novel embodiments and modifications can be implemented in various other forms, and various omissions, replacements, changes, and the like can be made without departing from the scope of the present invention. In addition, not all combinations of features described in these embodiments and modifications are necessarily essential to the means for solving the problems of the invention. Further, these embodiments and modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus, 8 ... Vehicle, 9 ... Crew, 10 ... Webbing, 10a ... Shoulder belt part, 10b ... Lap belt part, 12 ... 1st retractor, 14 ... 2nd retractor, 16 ... Buckle drive part, 16a ... wire, 16b ... guide, 18 ... anchor, 20 ... tang plate, 22 ... buckle, 24 ... control part, 80 ... seat, 81 ... seat part, 82 ... seat back, 83 ... headrest, 85 ... pillar, 86 ... Steering, 800 ... vehicle communication system, 801 ... vehicle control device, 802 ... ambient monitoring device, 803 ... automatic operation control device, 804 ... occupant monitoring device, 804a ... camera, 805 ... grip sensor, 806 ... vehicle LAN

Claims (7)

  After controlling the at least one tension adjusting unit for adjusting the tension of the webbing and giving a warning by giving a first tension to the webbing by inputting a trigger signal for warning that the end of the automatic operation is near, When the determination is made to increase the occupant's restraint performance without satisfying the defined first condition, the occupant's restraint property is enhanced by applying a second tension larger than the first tension to the webbing. In addition, a seatbelt device including a control unit that stops applying the second tension when a predetermined second condition is satisfied while the second tension is applied. The control unit is configured such that the occupant is in a drivable state by an occupant monitoring device mounted on the vehicle when the grip of the occupant's steering is not detected by a grip sensor mounted on the vehicle for a predetermined period. It is determined that the first condition is that the vehicle can be stopped within a predetermined time,
The seat belt device according to claim 1. The control unit sets the first condition that a result of monitoring the posture of the occupant by an occupant monitoring device mounted on the vehicle is an appropriate posture.
The seat belt device according to claim 1. When the control unit assumes that another vehicle or an object collides, the first condition is that the impact on the occupant is reduced.
The seat belt device according to claim 1. The control unit detects an approach of another vehicle or an object while the vehicle is stopped by the surroundings monitoring device mounted on the vehicle, and the result of monitoring the posture of the passenger by the passenger monitoring device mounted on the vehicle If the vehicle is not in the proper posture,
The seat belt device according to any one of claims 1 to 4. The control unit uses the grip sensor mounted on the vehicle to detect the grip of the occupant's steering, or detect the occupant's drivable state using the occupant monitoring device mounted on the vehicle as the second condition. ,
The seat belt device according to any one of claims 1 to 5. The control unit outputs the trigger signal output from the automatic driving control device mounted on the vehicle indicating that the end of the automatic driving is near, and the travelable distance output from the automatic driving control device from the current position to the destination. The trigger signal indicating that the end of the automatic driving is close because it is shorter than the distance to the vehicle, and the trigger indicating that the end of the automatic driving is near due to the detection of the failure of the vehicle output from the automatic driving control device Providing the warning based on at least one of the signals;
The seat belt device according to any one of claims 1 to 6.

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