JP2018138411A - Seat Belt Device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize a posture of an occupant on occurrence of vibration in a vehicle.SOLUTION: A seat belt device, when an acceleration sensor detects acceleration in a vehicle vertical direction (100) and detects acceleration that is equal to or more than a predetermined threshold, determines off-road travelling (102), and drives a motor to wind up a webbing to constraint an occupant with the webbing and stabilize a posture of the occupant in the off-road travelling (104). The seat belt device, when normal acceleration is detected continuously for a predetermined time, cancels winding of the webbing to allow drawing of the webbing (106 to 110).SELECTED DRAWING: Figure 4

Description

  The present invention relates to a seat belt device capable of winding a webbing by driving a driving unit such as a motor.

  As a seat belt device that winds webbing by a driving unit such as a motor, the webbing is driven by driving the motor when collision detection is detected or a collision is predicted as in the technique described in Patent Document 1, for example. The technology to pull in is known.

  Specifically, in Patent Document 1, in a motor-type seat belt retractor provided with a lock mechanism that prevents pulling out of a webbing that is pulled in the event of a vehicle emergency, the lock mechanism is a rotating shaft of a motor that rotates in the pulling-out direction of the webbing. There has been proposed a motor-type seat belt retractor configured to generate a rotational drag that prevents rotation on a rotating shaft of a motor.

JP 2001-347922 A

  However, in the technique of Patent Document 1, when the vehicle is vibrated due to running on rough roads such as steps, unevenness, and protrusions and the posture of the occupant becomes unstable, the posture cannot be stabilized. There is room for improvement.

  The present invention has been made in consideration of the above-described facts, and an object of the present invention is to stabilize the posture of an occupant when vibration occurs in a vehicle.

  In order to achieve the above-mentioned object, the invention described in claim 1 is directed to a detection unit that detects a rough road including at least one step difference in height, unevenness, and protrusion, and a drive that drives winding of the webbing onto the spool. And a control unit that controls the drive unit so as to wind up the webbing when the bad road is detected by the detection unit.

  According to the first aspect of the present invention, the detection unit detects a rough road that includes at least one height difference of the step, the unevenness, and the protrusion. For example, a bad road may be detected by detecting acceleration in the vertical direction of the vehicle as in the invention described in claim 3. In this case, as in the invention described in claim 4, the acceleration sensor in the vertical direction of the vehicle is detected by the acceleration sensor provided below the suspension spring of the vehicle, so that the acceleration sensor is disposed above the suspension spring. Acceleration can be detected faster than when it is provided. Moreover, the detection part may detect a bad road based on the picked-up image image | photographed by the imaging | photography part which image | photographs the vehicle front like the invention of Claim 5.

  The drive unit drives winding of the webbing onto the spool. That is, by driving the drive unit, the webbing can be wound around the spool to restrain the occupant.

  And in a control part, when a bad road is detected by the detection part, a drive part is controlled to wind up webbing. As a result, the webbing is wound on the spool when traveling on a rough road, so that the occupant is restrained and the posture of the occupant can be stabilized when vibration occurs in the vehicle.

  As in the second aspect of the invention, when the detection unit further detects the end of the rough road and the control unit detects the end of the rough road, the winding of the webbing is performed. The drive unit may be further controlled to stop the operation. Thereby, it becomes possible to loosen the restraining force by webbing after traveling on a rough road.

  Further, as in the invention described in claim 6, when the control unit determines the degree of the rough road detected by the detection unit and drives the driving unit, the webbing by the driving unit according to the degree of the bad road It may be driven by changing the winding torque. Thus, the occupant can be restrained by changing the restraining force depending on the degree of the rough road.

  Further, as in the invention described in claim 7, the vehicle further includes a vehicle speed detection unit that detects the vehicle speed, and when the control unit detects a bad road by the detection unit, the degree of the bad road detected by the detection unit And the drive unit may be controlled to wind up the webbing based on the detection result of the vehicle speed detection unit. That is, since the magnitude of vibration input to the vehicle varies depending on the vehicle speed when traveling on a rough road, the drive of the drive unit may be controlled according to the vehicle speed.

  According to an eighth aspect of the present invention, there is provided a side approach detection unit that detects approach of a vehicle side object, a drive unit that drives winding of a webbing onto a spool, and the side approach detection unit. A control unit that controls the drive unit to wind up the webbing when at least one of vehicle rollover, side collision, and vertical movement of the vehicle by the object is predicted based on the detection result of Based on the detection result of the side approach detection unit, the side approach detection unit that detects the approach of the webbing, the drive unit that drives the winding of the webbing onto the spool, and at least one of vehicle rollover and side collision is predicted A control unit that controls the drive unit so as to wind up the webbing.

  According to the eighth aspect of the invention, the side approach detection unit detects the approach to the object on the side of the vehicle. For example, the speed of approaching an object such as a side guardrail, a stepped surface, or an obstacle present on the inner ring when turning right or left is detected.

  The drive unit drives winding of the webbing onto the spool. That is, by driving the drive unit, the webbing can be wound around the spool to restrain the occupant.

  Then, the control unit drives to wind up the webbing when at least one of vehicle rollover, side collision, and vertical movement of the vehicle due to the object is predicted based on the detection result of the side approach detection unit. Part is controlled. As a result, the passenger can be restrained by winding up the webbing in preparation for a vehicle rollover, side collision, vertical movement of the vehicle due to an object such as a step, and the occupant posture can be stabilized during a rollover or side collision. .

  As described above, according to the present invention, there is an effect that the posture of the occupant can be stabilized when vibration is generated in the vehicle.

It is a front view showing a schematic structure of a seat belt device concerning a 1st embodiment. It is a block diagram which shows the structure of the control system of the seatbelt apparatus which concerns on 1st Embodiment. It is a figure which shows the example of arrangement | positioning of the vehicle of an acceleration sensor. It is a flowchart showing an example of the flow of winding control performed with the control apparatus of the seatbelt apparatus which concerns on 1st Embodiment. It is a block diagram which shows the structure of the control system of the seatbelt apparatus of a modification. It is a flowchart showing an example of the flow of winding control performed with the control apparatus of the seatbelt apparatus of a modification. (A) It is a block diagram which shows the structure of the control system of the seatbelt apparatus further provided with the vehicle speed sensor, (B) is a figure which shows an example of the threshold value of the acceleration for every vehicle speed. It is a block diagram which shows the structure of the control system of the seatbelt apparatus which concerns on 2nd Embodiment. It is a flowchart which shows an example of the flow of winding control performed with the control apparatus of the seatbelt apparatus which concerns on 2nd Embodiment.

Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a front view illustrating a schematic configuration of the seat belt device according to the first embodiment. In FIG. 1, the outer side in the vehicle width direction (right side of the vehicle) is indicated by an arrow OUT, and the upper side is indicated by an arrow UP.

  As shown in FIG. 1, the seat belt device 10 is mounted on a vehicle seat 12, and the front, right, and upper sides of the seat 12 are directed to the front, right, and upper sides of the vehicle, respectively. A seat cushion 12 </ b> A is provided at the lower part of the seat 12, and a seat back 12 </ b> B is provided at the rear portion of the seat 12, so that a vehicle occupant 14 can be seated on the seat 12.

  The seat belt device 10 includes a long belt-like webbing 16 (belt) having flexibility.

  The webbing 16 is wound and stored in the winding device 18 from the base end side in the longitudinal direction, and the winding device 18 is mounted on the vehicle body (or the seat 12) on the outer side in the vehicle width direction of the seat 12 and in the lower portion. While being fixed, the webbing 16 is pulled out to the vehicle front side.

  The winding device 18 is provided with a locking mechanism (not shown), and the locking mechanism is used in the event of a vehicle emergency such as when the webbing 16 is suddenly pulled out from the winding device 18 or when the vehicle is suddenly decelerated. Actuated to lock the withdrawal of the webbing 16 from the winding device 18. Further, the winding device 18 is provided with a motor 52 (see FIG. 2) as an example of a driving unit, and the webbing 16 can be wound around the spool 18A by driving the motor 52.

  A shoulder anchor 20 is fixed to the vehicle body in the vehicle width direction outer side of the seat 12 and the upper vehicle rear side (or the seat 12), and a long rectangular insertion hole is formed in the shoulder anchor 20 so as to penetrate therethrough. Has been.

  The webbing 16 is inserted through the insertion hole of the shoulder anchor 20, and the webbing 16 is supported in a state of being folded back through the insertion hole of the shoulder anchor 20.

  Further, the front end of the webbing 16 in the longitudinal direction is supported by an anchor 22, and the anchor 22 is fixed to a vehicle body (or the seat 12) on the outer side and the lower side of the rear portion of the seat 12 in the vehicle width direction.

  A tongue 24 is provided at a portion between the shoulder anchor 20 and the anchor 22 of the webbing 16. An elongated rectangular insertion hole is formed through the tongue 24, and the webbing 16 is inserted into the insertion hole so as to be movable in the longitudinal direction.

  Further, a buckle 26 is fixed to the vehicle body (the seat 12 may be the vehicle body in the vehicle width direction inside and rearward of the rear portion of the seat 12. The tongue 24 is detachable from the buckle 26, and the webbing 16 is pulled out from the winding device 18, and the tongue 24 is attached to the buckle 26, whereby the webbing 16 is attached to the occupant 14 seated on the seat 12. Mounted from the front.

  As a result, the webbing 16 is supported in a state where the webbing 16 is folded back through the insertion hole of the tongue 24, so that the portion between the shoulder anchor 20 and the tongue 24 of the webbing 16 (the portion on one side of the tongue 24) is shoulder webbing. 16A (shoulder belt) is attached to the shoulder and chest of the occupant 14 in an oblique direction.

  Further, a portion between the tongue 24 and the anchor 22 of the webbing 16 (portion on the other side of the tongue 24) is used as a lap webbing 16B (lap belt), and is mounted laterally on the waist of the occupant 14.

  The lap webbing 16B is provided with tongue stoppers 28 protruding from both surfaces of the lap webbing 16B, and the tongue stoppers 28 restrict the movement of the tongue 24 toward the front end side in the longitudinal direction of the webbing 16.

  Next, the configuration of the control system of the seat belt device according to the present embodiment will be described. FIG. 2 is a block diagram illustrating a configuration of a control system of the seat belt device according to the present embodiment.

  The seat belt device 10 includes a control device 50 as an example of a control unit that controls driving of a motor 52 that winds the webbing 16.

  The control device 50 includes a computer in which a CPU 50A, a ROM 50B, a RAM 50C, and an I / O (input / output interface) 50D are connected to a bus 50E.

  The ROM 50B stores a program for controlling the winding of the webbing 16 of the seat belt device 10. When the program stored in the ROM 50B is expanded in the RAM 50C and executed by the CPU 50A, the winding control of the webbing 16 is performed.

  A motor 52 is connected to the I / O 50D, and an acceleration sensor 54 as an example of a detection unit is connected.

  The motor 52 winds the webbing 16 around the spool 18A as described above. Specifically, the webbing 16 is wound around the spool 18A by rotationally driving the spool 18A around which the webbing 16 is wound.

  The acceleration sensor 54 detects the acceleration in the vehicle vertical direction input to the vehicle from the road surface, and outputs the detection result to the control device 50. The acceleration sensor 54 is provided below the spring 34 of the suspension 32 on the front side of the vehicle. For example, it may be provided on a shock absorber below the spring 34 of the suspension 32, or may be provided on a lower arm of the vehicle.

  Here, the winding control of the webbing 16 performed by the control device 50 of the seatbelt device 10 according to the present embodiment will be described.

  When the vehicle travels on a rough road surface, the posture of the occupant becomes unstable due to input from the rough road surface, and the occupant may come into contact with the interior of the vehicle. Winding control for winding the webbing 16 is performed when the road traveling is detected and the vehicle is traveling on a rough road. Since the occupant is restrained by winding the webbing 16 in the case of rough road traveling, the posture of the occupant can be stabilized when vibration occurs in the vehicle, and contact of the occupant with the interior can be suppressed. In the present embodiment, the rough road includes a height difference of at least one of a step, an unevenness, and a protrusion. Moreover, you may apply as a bad road what generate | occur | produces the vibration more than a predetermined magnitude | size when drive | working.

  The bad road is detected based on the acceleration in the vehicle vertical direction input to the vehicle detected by the acceleration sensor 54. Specifically, when an acceleration equal to or higher than a predetermined threshold is detected, it is determined that the vehicle is traveling on a rough road, and the control device 50 drives the motor 52.

  In addition, after driving the motor 52 and winding the webbing 16 to restrain the occupant, the control device 50 stops driving the motor 52 when normal acceleration less than the threshold is continuously detected for a predetermined time. To control. Thereby, the webbing 16 can be pulled out, and the restraining force of the occupant can be relaxed. At this time, when releasing the restraint of the occupant, the motor 52 may be stopped and the webbing 16 can be pulled out. However, the motor 52 is reversely rotated by the amount wound up and the webbing 16 is pulled out. Good.

  The threshold for detecting the rough road may be one, but a plurality of thresholds are provided, and the driving current of the motor 52 is controlled according to the degree of the rough road (acceleration magnitude), so that the winding torque is variable. It is good. That is, the winding torque of the webbing 16 may be controlled to increase as the acceleration in the vehicle vertical direction due to the bad road increases. Thus, the occupant can be restrained by changing the restraining force depending on the degree of the rough road.

  Subsequently, specific processing performed by the control device 50 of the seatbelt device 10 according to the present embodiment configured as described above will be described. FIG. 4 is a flowchart showing an example of a winding control flow performed by the control device 50 of the seatbelt device 10 according to the present embodiment. Note that the winding control in FIG. 4 is started when, for example, an ignition switch (not shown) is turned on.

  In step 100, the CPU 50A acquires the detection result of the acceleration sensor 54, thereby detecting the acceleration in the vertical direction of the vehicle and proceeds to step 102.

  In step 102, the CPU 50A determines whether or not the detected acceleration is greater than or equal to a threshold value. If the determination is affirmative, the routine proceeds to step 104 on the assumption that a rough road has been detected. If the determination is negative, the routine returns to step 100 to repeat the above processing.

  In step 104, the CPU 50 </ b> A drives the motor 52 to wind the webbing 16, restrains the occupant with the webbing 16, and proceeds to step 106. Thereby, since a passenger | crew is restrained by winding-up of the webbing 16 at the time of rough road driving | running | working, a passenger | crew's attitude | position can be stabilized at the time of rough road driving | running | working. As described above, when a plurality of acceleration threshold values are provided, the motor 52 is driven so as to be wound at a predetermined winding torque according to the threshold values, so that the webbing 16 according to the degree of the rough road can be obtained. The winding torque may be varied.

  In step 106, the CPU 50 </ b> A acquires the detection result of the acceleration sensor 54, thereby detecting again the acceleration in the vehicle vertical direction, and proceeds to step 108.

  In step 108, the CPU 50A determines based on the detection result of the acceleration sensor 54 whether or not normal acceleration less than the threshold value continues for a predetermined time. If the determination is affirmative, the process proceeds to step 110 because the rough road ends, and if the determination is negative, the process returns to step 106 and the above-described processing is repeated.

  In step 110, the CPU 50A stops driving the motor 52 to cancel the winding of the webbing 16, returns to step 100, and repeats the above processing. That is, by releasing the winding of the webbing 16, it becomes possible to loosen the restraining force due to the webbing after traveling on a rough road.

  As described above, in this embodiment, a bad road is detected based on the acceleration in the vertical direction of the vehicle, and when the bad road is detected, the motor 52 is driven and the webbing 16 is wound up, so that the occupant 16 It is possible to stabilize the occupant's posture when driving on a rough road by restraining the vehicle. Further, by stabilizing the occupant posture when traveling on rough roads, it is possible to suppress the occupant's contact with the interior.

  In the above-described embodiment, an example in which a bad road is detected by detecting acceleration in the vehicle vertical direction by the acceleration sensor 54 has been described, but detection of a bad road is not limited thereto. For example, a rough road ahead may be detected from a captured image of the camera to predict the rough road traveling.

  That is, as shown in FIG. 5, instead of the acceleration sensor 54, a camera 56 may be provided as a detection unit and a photographing unit, and a photographed image photographed by the camera 56 may be input to the control device 50. FIG. 5 is a block diagram illustrating a configuration of a control system of a seat belt device according to a modification.

  The camera 56 is provided in the vicinity of the inner mirror of the vehicle, for example, and images the front of the vehicle, and outputs the captured image to the control device 50 as the imaging result.

  The control device 50 determines whether or not there is a rough road ahead based on the captured image captured by the camera 56. For example, the control device 50 detects the rough road by determining whether or not there is a bad road that is equal to or greater than a predetermined undulation (step) from the captured image of the camera 56. And when a bad road is detected, the motor 52 is driven, the webbing 16 is wound up similarly to said embodiment, and a passenger | crew is restrained. Thereby, similarly to said embodiment, when a bad road is detected, a passenger | crew's contact to an interior can be suppressed by winding up webbing and restraining a passenger | crew.

  Next, a specific process performed by the control device 50 of the seat belt apparatus according to the modification will be described. FIG. 6 is a flowchart illustrating an example of a flow of winding control performed by the control device 50 of the seat belt device according to the modification. Note that the winding control in FIG. 6 is started when, for example, an ignition switch (not shown) is turned on.

  In step 200, the CPU 50A starts photographing with the camera 56 and proceeds to step 202.

  In step 202, the CPU 50 </ b> A detects the road surface condition from the photographed image photographed by the camera 56 and proceeds to step 204. The road surface condition is detected by image processing to detect the presence or absence of a rough road that is greater than a predetermined undulation (step) in front of the vehicle.

  In step 204, the CPU 50A determines whether a bad road has been detected from the captured image. If the determination is affirmative, the process proceeds to step 206. If the determination is negative, the process returns to step 202 and the above-described processing is repeated.

  In step 206, the CPU 50 </ b> A drives the motor 52 to wind the webbing 16, restrains the occupant with the webbing 16, and proceeds to step 208. Thereby, a passenger | crew is restrained by winding of the webbing 16 at the time of a rough road driving | running | working, and a passenger | crew's contact to the interior can be suppressed. In addition, the degree of bad road is determined by a plurality of thresholds, etc., and the motor 52 is driven so as to wind up with a predetermined winding torque according to the degree of bad road, thereby webbing according to the degree of bad road. The 16 winding torque may be varied. Thus, the occupant can be restrained by changing the restraining force depending on the degree of the rough road.

  In step 208, the CPU 50 </ b> A detects the road surface condition again from the captured image captured by the camera 56 and proceeds to step 210. As in step 202, the road surface condition is detected by image processing to detect the presence or absence of a rough road that is greater than a predetermined undulation (step) in front of the vehicle.

  In step 210, the CPU 50A determines whether or not the rough road has ended from the captured image. If the determination is affirmative, the process proceeds to step 212. If the determination is negative, the process returns to step 208 to repeat the above processing.

  In step 212, the CPU 50A stops driving the motor 52 to cancel the winding of the webbing 16, returns to step 202, and repeats the above processing. That is, by releasing the winding of the webbing 16, it becomes possible to loosen the restraining force due to the webbing after traveling on a rough road.

  As described above, in this embodiment, when a rough road is detected from the captured image and the bad road is detected, the motor 52 is driven and the webbing 16 is wound up. Thus, contact with the interior of the passenger can be suppressed.

  By the way, since the magnitude of vibration input to the vehicle varies depending on the vehicle speed when traveling on a rough road, the threshold of acceleration for driving the motor 52 according to the vehicle speed, and the undulation (step) when detecting the rough road from the photographed image. The threshold value may be changed. For example, as shown in FIG. 7A, a vehicle speed sensor 58 as an example of a vehicle speed detection unit is further provided in FIG. 1 of the above embodiment, and as shown in FIG. A threshold value for driving the motor 52 may be set according to the vehicle speed detected by the vehicle speed sensor 58 by setting a threshold value for acceleration in advance. Similarly, a vehicle speed sensor 58 may be further provided for the modified example, and a threshold value for detecting a bad road may be set according to the vehicle speed. Furthermore, even when a threshold value for the degree of bad road such as a plurality of accelerations is provided, a plurality of threshold values corresponding to the vehicle speed may be determined in advance, and the driving of the motor 52 may be controlled based on the degree of the bad road and the vehicle speed. .

  In the above-described embodiment, an example in which a rough road is detected using an acceleration sensor and a bad road is detected using a camera has been described in the modification. However, the method for detecting a rough road is not limited to this. For example, a rough road may be detected using various radars such as a laser radar and an ultrasonic radar. Alternatively, the stroke may be detected by a sensor that detects the stroke of the suspension 32, and the acceleration may be calculated from the detected stroke to detect a rough road. Alternatively, the rough road may be detected by detecting the compression speed of the suspension 32 by a sensor that detects the compression speed of the suspension 32 and calculating the acceleration from the detected compression speed.

(Second Embodiment)
Next, the seat belt device according to the second embodiment will be described. FIG. 8 is a block diagram illustrating a configuration of a control system of the seat belt device according to the second embodiment.

  Since the configuration of the seat belt device 10 itself is the same in the seat belt device according to the second embodiment, detailed description thereof is omitted.

  As shown in FIG. 8, the control system of the seat belt device according to the present embodiment includes a control device 50, a side approach detection unit 60, an acceleration sensor 54, and a motor 52.

  As in the first embodiment, the control device 50 includes a computer in which a CPU 50A, a ROM 50B, a RAM 50C, and an I / O (input / output interface) 50D are connected to a bus 50E.

  The ROM 50B stores a program for controlling the winding of the webbing 16 of the seat belt device 10. When the program stored in the ROM 50B is expanded in the RAM 50C and executed by the CPU 50A, the winding control of the webbing 16 is performed.

  A motor 52 is connected to the I / O 50D, and a side approach detection unit 60 and an acceleration sensor 54 are connected to the I / O 50D.

  The motor 52 winds the webbing 16 around the spool 18A as in the first embodiment. Specifically, the webbing 16 is wound around the spool 18A by rotationally driving the spool 18A around which the webbing 16 is wound.

  The side approach detection unit 60 detects the approach speed to a side guardrail, a stepped surface, an obstacle existing on the inner ring side when turning right or left. For example, the side approach detection unit 60 can apply various sensors such as an ultrasonic radar, a camera, and the like.

  The acceleration sensor 54 detects acceleration applied to the vehicle. In the present embodiment, an acceleration for detecting a collision is detected, and the control device 50 determines that a collision occurs when an acceleration equal to or greater than a predetermined threshold is detected.

  In the present embodiment, the approach to the object on the side of the vehicle is detected, and when at least one of rollover, side collision, and vertical movement of the vehicle by the object is predicted based on the detection result, the webbing is wound. The control device 50 controls so as to take.

  Subsequently, processing performed by the control device 50 of the seat belt device according to the second embodiment configured as described above will be described. FIG. 9 is a flowchart showing an example of a winding control flow performed by the control device 50 of the seatbelt device according to the present embodiment. Note that the winding control in FIG. 9 is started when, for example, an ignition switch (not shown) is turned on.

  In step 300, the CPU 50 </ b> A acquires the detection result of the side approach detection unit 60 and proceeds to step 302. That is, the approach speed to the side guardrail, the stepped surface on the currently running road surface, the obstacle present on the inner ring side when turning right or left is detected.

  In step 302, the CPU 50A determines whether or not the detected approach speed is equal to or greater than a predetermined threshold value. If the determination is negative, the process returns to step 300 and the above processing is repeated. If the determination is affirmative, the routine proceeds to step 304.

  In step 304, the CPU 50 </ b> A drives the motor 52 to wind the webbing 16, restrains the occupant with the webbing 16, and proceeds to step 306. As a result, the webbing 16 can be wound up to restrain the occupant in preparation for a phenomenon such as a side collision, a rollover, a vertical movement of the vehicle due to an object such as a step, and the occupant posture can be stabilized when the phenomenon occurs. .

  In step 306, the CPU 50A acquires the detection result of the acceleration sensor 54, and proceeds to step 308.

  In step 308, the CPU 50A determines whether or not a predicted phenomenon has occurred. This determination is made by determining whether or not the acceleration detected by the acceleration sensor 54 is equal to or greater than a predetermined threshold, for example, side collision, rollover, vertical movement of the vehicle by an object such as a step, etc. It is determined whether or not the expected phenomenon has occurred. If the determination is negative, the process proceeds to step 318, and if the determination is affirmative, the process proceeds to step 310.

  In step 310, the CPU 50 </ b> A continues the operation of the webbing 16 by continuing to drive the motor 52, and proceeds to step 312.

  In step 312, the CPU 50A acquires the detection result of the acceleration sensor 54 again, and proceeds to step 314.

  In step 314, the CPU 50A determines whether or not the phenomenon has ended. In this embodiment, for example, the determination is made based on the detection result of the acceleration sensor 54 to determine whether or not the vehicle has stopped. If the determination is negative, the process returns to step 310 and the above-described processing is repeated. If the determination is affirmative, the process proceeds to step 316. That is, it is determined whether or not a phenomenon such as a collision, a rollover, or a vertical movement of the vehicle has occurred and the phenomenon has ended after a predetermined time has elapsed.

  In step 316, the CPU 50A stops driving the motor 52, cancels the winding of the webbing 16, and ends the series of processes.

  On the other hand, in step 318, the CPU 50A acquires the detection result of the acceleration sensor 54 again, and proceeds to step 320.

  In step 320, the CPU 50A determines whether or not the stable state continues for a certain period of time. In this determination, for example, it is determined whether or not the detection result of the acceleration sensor 54 is a change within a predetermined range. If the determination is affirmative, the process proceeds to step 322, and if the determination is negative, the process proceeds to step 324.

  In step 322, the CPU 50A stops driving the motor 52, cancels the winding of the webbing 16, returns to step 300, and repeats the above processing. That is, when a phenomenon such as a collision, rollover, and vehicle vertical movement is avoided, when the stable state continues for a certain period of time, the restraint of the webbing 16 is released and the normal traveling state is restored.

  In step 324, the CPU 50A continues the operation of the webbing 16 by continuing to drive the motor 52, and returns to step 306 to repeat the above-described processing.

  As described above, in the present embodiment, the webbing 16 is driven by driving the motor 52 in preparation for a phenomenon such as a vehicle rollover (for example, a rollover on a rough road), a side collision, a vehicle vertical movement due to a step, and the like. By winding up, the occupant can be restrained by the webbing 16, and the occupant posture can be stabilized when a phenomenon occurs.

  In addition, although the process performed by the control apparatus 50 in said embodiment and modification may be a process performed by software, it is good also as a process performed by hardware, and the process which combined both hardware and software. It is good.

  Further, the processing performed by the control device 50 in the above-described embodiments and modifications may be stored and distributed as a program in a storage medium.

  Furthermore, the present invention is not limited to the above, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Seat belt apparatus 16 Webbing 18 Winding apparatus 18A Spool 32 Suspension 34 Spring 50 Control apparatus 52 Motor 54 Acceleration sensor 56 Camera 58 Vehicle speed sensor

Claims (8)

A detection unit for detecting a rough road including at least one height difference of a step, an unevenness, and a protrusion;
A drive unit that drives winding of the webbing onto the spool;
A control unit that controls the drive unit to wind up the webbing when the bad road is detected by the detection unit;
A seat belt device comprising: The detection unit further detects the end of traveling on the rough road,
2. The seat belt device according to claim 1, wherein the control unit further controls the driving unit to stop winding of the webbing when the detection unit detects the end of traveling on the rough road.   The seat belt device according to claim 1 or 2, wherein the detection unit detects the rough road by detecting acceleration in a vehicle vertical direction.   The seat belt device according to claim 3, wherein the detection unit detects acceleration in a vehicle vertical direction by an acceleration sensor provided below a spring of a vehicle suspension.   The seat belt device according to claim 1 or 2, wherein the detection unit detects the rough road based on a photographed image photographed by a photographing unit that photographs the front of the vehicle.   The control unit determines the degree of the rough road detected by the detection unit, and when driving the driving unit, changes the winding torque of the webbing by the driving unit according to the degree of the bad road. The seatbelt apparatus of any one of Claims 1-5 to drive. A vehicle speed detector for detecting the vehicle speed;
When the bad road is detected by the detection unit, the control unit winds the webbing based on the degree of the bad road detected by the detection unit and the detection result of the vehicle speed detection unit. The seatbelt apparatus of any one of Claims 1-6 which control the said drive part. A side approach detection unit for detecting approach to an object on the side of the vehicle;
A drive unit that drives winding of the webbing onto the spool;
Based on the detection result of the side approach detection unit, when at least one of vehicle rollover, side collision, and vertical movement of the vehicle due to the object is predicted, the driving unit is configured to wind up the webbing. A control unit to control;
A seat belt device comprising: