JP2019038384A - Seat belt device - Google Patents

Abstract

To provide a seat belt device that can bring webbing into close contact with an occupant by controlling influence from acceleration of a vehicle.SOLUTION: A seat belt device controls a motor so as to wind up webbing after lapse of predetermined standby time when fastening of the webbing is detected and the acceleration is less than predetermined acceleration (104 to 108). In the meantime, the seat belt device extends the standby time when abrupt acceleration that is equal to or higher than the predetermined acceleration is detected during the stand-by time (110).SELECTED DRAWING: Figure 5

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, for example, a technique described in Patent Document 1 has been proposed.

  Patent Document 1 discloses a fitting assist that winds up a webbing so that the webbing comes into close contact with the occupant when the vehicle is in a state in which the webbing is worn or the vehicle starts to travel forward or starts traveling forward. It is described that control is performed.

Japanese Patent Laying-Open No. 2006-155542

  However, in the technique of Patent Document 1, fitting assist control is performed by reaching a state in which traveling starts or starts traveling in a webbing wearing state, but acceleration at the time of starting winding of the webbing is not considered. So there is room for improvement. For example, when the webbing is rapidly accelerated when starting the winding of the webbing, the webbing is wound in a state where the occupant is caught in the seat, so that the final winding amount of the webbing is increased and uncomfortable feeling is given. On the other hand, if the webbing is decelerated when it is wound, the webbing is wound while the occupant is pushed forward, so that the final amount of webbing is small and the webbing can be in close contact with the occupant. Absent.

  The present invention has been made in consideration of the above-described facts, and an object of the present invention is to provide a seatbelt device that can suppress the influence of vehicle acceleration and allow webbing to be in close contact with an occupant.

  In order to achieve the above object, the first aspect is preliminarily determined when a driving unit that drives winding of the webbing, a detection unit that detects the wearing of the webbing, and when the wearing of the webbing is detected by the detection unit. After the waiting time has elapsed, the drive unit is controlled to wind up the webbing, and when the webbing is detected by the detection unit, a detection unit that detects the acceleration of the vehicle detects an acceleration greater than a predetermined acceleration. And a controller that controls the drive unit by extending the waiting time.

  According to the first aspect, the webbing is wound up by driving the driving unit, and the wearing of the webbing is detected by the detecting unit.

  Then, in the control unit, when the wearing of the webbing is detected by the detection unit, the drive unit is controlled so as to wind up the webbing after a predetermined standby time has elapsed. Further, in the control unit, when the detection unit detects the wearing of the webbing, and the acceleration unit detects the acceleration exceeding the predetermined acceleration by the detection unit that detects the acceleration of the vehicle, the driving unit extends the standby time. Is controlled. As a result, the webbing can be brought into close contact with the occupant while suppressing the influence of the acceleration of the vehicle.

  The control unit may control the drive unit by extending the standby time again when the detection unit detects an acceleration equal to or higher than a predetermined acceleration after extending the standby time. Accordingly, the webbing can be brought into close contact with the occupant at a timing when the acceleration of the vehicle is stabilized.

  Further, the standby time may be extended by a predetermined time according to the acceleration. For example, a different time may be extended between the extension time in acceleration and the extension time in deceleration. Or you may extend for the predetermined time according to the magnitude | size of acceleration irrespective of acceleration / deceleration.

  In addition, the control unit is driven to wind up the webbing after the standby time has elapsed when the detection unit detects the wearing of the webbing and the vehicle speed detection unit that detects the vehicle speed detects a vehicle speed that is equal to or higher than a predetermined speed. When the vehicle speed detection unit detects the vehicle speed and the vehicle speed detection unit detects the vehicle speed, the detection unit detects an acceleration greater than the predetermined acceleration. In such a case, the drive unit may be controlled by extending the standby time.

  As described above, according to the present invention, there is an effect that it is possible to provide a seat belt device capable of suppressing the influence of the acceleration of the vehicle and bringing the webbing into close contact with the occupant.

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. (A) is a figure which shows the conventional standby time until fitting assist control in case a vehicle speed becomes more than the predetermined vehicle speed v, and accelerates gently, (B) is a vehicle speed more than the predetermined vehicle speed v. FIG. 7C is a diagram illustrating a conventional standby time until fitting assist control when sudden acceleration is performed, and FIG. 8C is a conventional standby time until fitting assist control when the vehicle speed is decelerated after the vehicle speed becomes equal to or higher than a predetermined vehicle speed v. FIG. (A) is a figure which shows the waiting time in this embodiment until fitting assistance control in case a vehicle speed becomes more than the predetermined vehicle speed v and accelerates gently, (B) is a vehicle speed more than the predetermined vehicle speed v. It is a figure which shows the waiting time in this embodiment until the fitting assist control in the case of sudden acceleration and becomes, and (C) is until the fitting assist control in the case of decelerating after the vehicle speed becomes equal to or higher than the predetermined vehicle speed v. It is a figure which shows the waiting time in this embodiment. It is a flowchart showing an example of the flow of fitting assist control performed with the control apparatus of the seatbelt apparatus which concerns on this embodiment. It is a flowchart showing the flow of the 1st modification of fitting assistance control performed with the control apparatus of the seatbelt apparatus which concerns on this embodiment. It is a flowchart showing the flow of the 2nd modification of fitting assistance control performed with the control apparatus of the seatbelt apparatus which concerns on this embodiment.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. 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 rear side 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, a vehicle speed sensor 56 as an example of a detection unit, a buckle switch 58, an courtesy switch 60, and a seating sensor 62 as examples of a detection unit are connected. ing.

  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 generated in the vehicle and outputs the detection result to the control device 50. In the present embodiment, the acceleration sensor 54 is described as detecting acceleration in the acceleration / deceleration direction of the vehicle, but may also detect acceleration in the vehicle width direction.

  The vehicle speed sensor 56 detects the traveling speed of the vehicle and outputs the detection result to the control device 50. Note that the vehicle speed sensor 56 may be omitted, and the vehicle speed may be detected from the detection result of the acceleration sensor 54.

  The buckle switch 58 is a switch that detects wearing of the seat belt, detects insertion of the tongue 24 into the buckle 26, and outputs a detection result to the control device 50.

  The courtesy switch 60 is a switch that detects opening and closing of a vehicle door, and outputs a detection result to the control device 50.

  The seating sensor 62 is provided, for example, on the seat cushion 12 </ b> A, detects the seating of the occupant 14 on the seat 12, and outputs the detection result to the control device 50.

  Then, when the occupant 14 gets on and detects wearing of the seat belt, the control device 50 causes the motor 52 to wind up the webbing 16 to bring the webbing into close contact with the occupant 14 after a predetermined waiting time has elapsed. Control the drive. The driving of the motor 52 is stopped when, for example, a predetermined load or more is reached. In the following, the control for winding up the webbing 16 to bring the webbing into close contact with the occupant 14 may be referred to as fitting assist control.

  By the way, in the conventional fitting assist control, when the vehicle speed becomes equal to or higher than a predetermined speed v (for example, 20 km / h), the driving of the motor 52 is started after a predetermined standby time (for example, 2 s) has elapsed. It was. For example, as shown in FIG. 3A, the driving of the motor 52 is started at time t2 after the standby time has elapsed after the vehicle speed becomes equal to or higher than the predetermined speed v at time t1.

  At this time, as shown in FIG. 3 (B), even when the vehicle accelerates rapidly during the standby time before the fitting assist control or when the vehicle is decelerated as shown in FIG. I was doing control. When fitting assist control is performed during rapid acceleration, the control is performed with the body of the occupant 14 retracted into the seat 12, so that the final winding amount of the webbing 16 is increased, resulting in discomfort. On the other hand, when fitting assist control is performed at the time of deceleration, the control is performed with the occupant 14 being pushed forward, so that the final webbing winding amount is small, and the webbing cannot be in close contact with the occupant 14. .

  Therefore, in the present embodiment, when the wearing of the webbing 16 is detected, the acceleration is detected, and when the acceleration higher than the predetermined acceleration is detected, the standby time is extended and the driving of the motor 52 is controlled. It is supposed to be.

  That is, when the wearing of the webbing 16 is detected and the acceleration is less than a predetermined acceleration, the webbing 16 is wound up after a predetermined waiting time has elapsed, as shown in FIG. 4A. Thus, the motor 52 is controlled.

  On the other hand, when the wearing of the webbing 16 is detected and a sudden acceleration higher than a predetermined acceleration is detected, the standby time is extended. That is, as shown in FIG. 4B, the driving of the motor 52 is started when a time t2 'that is longer than the time t2 from a time t1 at which the vehicle speed v is set in advance. The standby time is also extended when the wearing of the webbing 16 is detected and a deceleration greater than a predetermined acceleration is detected. That is, as shown in FIG. 4C, the driving of the motor 52 is started when a time t2 'that is longer than the time t2 from a time t1 at which the vehicle speed v is reached is reached. As a result, it is possible to suppress excessive winding or insufficient winding of the webbing 16.

  Note that the standby time may be extended, for example, by a predetermined time. Alternatively, a predetermined time may be extended according to the magnitude of acceleration.

  Further, the acceleration may be detected again after the standby time is extended, and the standby time may be extended again when an acceleration equal to or higher than a predetermined acceleration is detected.

  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. 5 is a flowchart illustrating an example of a flow of fitting assist control performed by the control device 50 of the seatbelt device 10 according to the present embodiment. The fitting assist control in FIG. 5 starts when the door closing is detected by the courtesy switch 60, the seating of the occupant 14 is detected by the seating sensor 62, and the wearing of the webbing 16 is detected by the buckle switch 58. Alternatively, it may be started when the attachment of the webbing 16 is detected by the buckle switch 58.

  In step 100, the CPU 50 </ b> A acquires the detection result of the vehicle speed sensor 56 to detect the vehicle speed and proceeds to step 102.

  In step 102, the CPU 50A determines whether or not the detected vehicle speed is equal to or higher than a predetermined vehicle speed v. If the determination is affirmative, the process proceeds to step 104. If the determination is negative, the process returns to step 100 and the above-described processing is repeated.

  In step 104, the CPU 50 </ b> A acquires the detection result of the acceleration sensor 54 to detect the acceleration, and proceeds to step 106.

  In step 106, the CPU 50A determines whether or not the detected acceleration is less than a predetermined acceleration. If the determination is affirmative, the process proceeds to step 108, and if the determination is negative, the process proceeds to step 110.

  In step 108, the CPU 50A performs fitting assist control after a predetermined waiting time has elapsed, and ends the series of processes. That is, the CPU 50A drives the motor 52 so as to wind up the webbing 16 after the standby time has elapsed, thereby winding up the slack of the webbing 16 and bringing the webbing 16 into close contact with the occupant 14.

  On the other hand, in step 110, the CPU 50A performs fitting assist control after the extended standby time obtained by extending the standby time by a predetermined time, and ends the series of processes. Thereby, it is suppressed that fitting assist control is performed at the time of rapid acceleration or deceleration, and the webbing 16 is excessively wound or insufficiently wound.

  Next, a first modification of the fitting assist control performed by the control device 50 of the seatbelt device 10 according to the present embodiment will be described. FIG. 6 is a flowchart showing a flow of a first modification of the fitting assist control performed by the control device 50 of the seatbelt device 10 according to the present embodiment. The fitting assist control in FIG. 6 starts when the door closing is detected by the courtesy switch 60, the seating of the occupant 14 is detected by the seating sensor 62, and the wearing of the webbing 16 is detected by the buckle switch 58. Alternatively, it may be started when the attachment of the webbing 16 is detected by the buckle switch 58. Further, the same processes as those in FIG. 5 will be described with the same reference numerals.

  In step 100, the CPU 50 </ b> A acquires the detection result of the vehicle speed sensor 56 to detect the vehicle speed and proceeds to step 102.

  In step 102, the CPU 50A determines whether or not the detected vehicle speed is equal to or higher than a predetermined vehicle speed v. If the determination is affirmative, the process proceeds to step 104. If the determination is negative, the process returns to step 100 and the above-described processing is repeated.

  In step 104, the CPU 50 </ b> A acquires the detection result of the acceleration sensor 54 to detect the acceleration, and proceeds to step 106.

  In step 106, the CPU 50A determines whether or not the detected acceleration is less than a predetermined acceleration. If the determination is affirmative, the process proceeds to step 108, and if the determination is negative, the process proceeds to step 109.

  In step 108, the CPU 50A performs fitting assist control after a predetermined waiting time has elapsed, and ends the series of processes. That is, the CPU 50A drives the motor 52 so as to wind up the webbing 16 after the standby time has elapsed, thereby winding up the slack of the webbing 16 and bringing the webbing 16 into close contact with the occupant 14.

  On the other hand, in step 109, the CPU 50A performs the fitting assist control after a predetermined standby time according to the acceleration, and ends the series of processes. Thereby, it is suppressed that fitting assist control is performed at the time of rapid acceleration or deceleration, and the webbing 16 is excessively wound or insufficiently wound. Note that the standby time determined in advance according to the acceleration may be set such that, for example, the time for extending the standby time is different between acceleration and deceleration. Or it is good also as standby time which extended predetermined time according to the magnitude | size of acceleration irrespective of acceleration / deceleration.

  Next, a second modification of the fitting assist control performed by the control device 50 of the seatbelt device 10 according to the present embodiment will be described. FIG. 7 is a flowchart showing a flow of a second modification of the fitting assist control performed by the control device 50 of the seatbelt device 10 according to the present embodiment. 7 starts when the door switch is detected by the courtesy switch 60, the seating sensor 62 detects the seating of the occupant 14 and the buckle switch 58 detects the wearing of the webbing 16. Alternatively, it may be started when the attachment of the webbing 16 is detected by the buckle switch 58. Further, the same processes as those in FIG. 5 will be described with the same reference numerals.

  In step 100, the CPU 50 </ b> A acquires the detection result of the vehicle speed sensor 56 to detect the vehicle speed and proceeds to step 102.

  In step 102, the CPU 50A determines whether or not the detected vehicle speed is equal to or higher than a predetermined vehicle speed v. If the determination is affirmative, the process proceeds to step 104. If the determination is negative, the process returns to step 100 and the above-described processing is repeated.

  In step 104, the CPU 50 </ b> A acquires the detection result of the acceleration sensor 54 to detect the acceleration, and proceeds to step 106.

  In step 106, the CPU 50A determines whether or not the detected acceleration is less than a predetermined acceleration. If the determination is affirmative, the process proceeds to step 108, and if the determination is negative, the process proceeds to step 112.

  In step 108, the CPU 50A performs fitting assist control after a predetermined waiting time has elapsed, and ends the series of processes. That is, the CPU 50A drives the motor 52 so as to wind up the webbing 16 after the standby time has elapsed, thereby winding up the slack of the webbing 16 and bringing the webbing 16 into close contact with the occupant 14.

  On the other hand, in step 112, the CPU 50A waits until a predetermined time elapses and proceeds to step 114. Note that the time to wait in step 112 may be, for example, the same time as the standby time in step 108 or a different time.

  In step 114, the CPU 50 </ b> A acquires the detection result of the acceleration sensor 54 again, thereby detecting the acceleration and proceeds to step 116.

  In step 116, CPU 50A determines whether or not there is acceleration / deceleration greater than or equal to a predetermined acceleration. If the determination is negative, the process proceeds to step 118. If the determination is positive, the process returns to step 112 and the above-described processing is repeated.

  In step 118, the CPU 50A performs fitting assist control and ends the series of processes.

  In this manner, the standby time until the fitting assist control is extended again until the acceleration settles below the predetermined acceleration, so that excessive winding or insufficient winding of the webbing 16 due to acceleration / deceleration can be more reliably suppressed.

  In addition, although the case where the vehicle speed became more than the predetermined vehicle speed v was demonstrated in the start condition of each fitting assist control in said embodiment and modification, it was not restricted to this. For example, step 100 and step 102 may be omitted and the vehicle speed may be removed from the fitting assist control start condition.

  In addition, the process performed by the control device 50 in the above-described embodiment and modification may be a process performed by software, may be a process performed by hardware, or a process combining 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 50 Control apparatus 52 Motor 54 Acceleration sensor 56 Vehicle speed sensor 58 Buckle switch

Claims (4)

A drive unit for driving the winding of the webbing;
A detection unit for detecting the wearing of the webbing;
When the detection unit detects the wearing of the webbing, the drive unit is controlled to wind up the webbing after a predetermined waiting time has elapsed, and when the detection unit detects the wearing of the webbing, A control unit that controls the drive unit by extending the waiting time when an acceleration equal to or higher than a predetermined acceleration is detected by a detection unit that detects acceleration;
A seat belt device comprising:   2. The control unit according to claim 1, wherein the control unit controls the driving unit by extending the standby time again when an acceleration greater than a predetermined acceleration is detected by the detection unit after extending the standby time. Seat belt device.   The seat belt device according to claim 1, wherein the extension of the waiting time is extended for a predetermined time according to acceleration. The control unit is configured to wind up the webbing after the standby time has elapsed when the detection unit detects the wearing of the webbing and the vehicle speed detection unit that detects the vehicle speed detects a vehicle speed equal to or higher than a predetermined speed. More than a predetermined acceleration by the detection unit when the driving unit is controlled, the wearing of the webbing is detected by the detection unit, and a vehicle speed higher than a predetermined speed is detected by the vehicle speed detection unit detecting the vehicle speed. The seatbelt apparatus according to any one of claims 1 to 3, wherein when the acceleration is detected, the driving time is controlled by extending the waiting time.