JP4088240B2 - Vehicle seat belt device - Google Patents

Description

  The present invention relates to a seat belt device mounted on a vehicle, and more particularly to a vehicle seat belt device that restrains and protects an occupant seated in a seat.

  The seat belt device operates when a collision is detected and regulates the withdrawal of the seat belt, and also quickly regulates the movement of the upper and lower body of the occupant seated on the seat by winding up the seat belt. By restraining, it is an apparatus which cooperates with an airbag, a side airbag, etc., and protects a passenger | crew (refer patent document 1).

  As this seat belt device, Patent Document 2 discloses that when a collision is predicted, the seat belt is wound from the initial position to generate the first tension F1 and the occupant is within a range where the driving operation for avoiding the collision is possible. A first pretensioner mechanism that restrains the vehicle and a second pretensioner mechanism that winds up the seat belt in the state of the first tension F1 in the event of a collision and generates the second tension F2 to restrain the occupant Has been proposed.

  In this seat belt device, for example, as shown in FIG. 9A, the radar 101 detects an obstacle (another vehicle) in front of the vehicle and transmits a detection signal to the control means 104. On the other hand, when the driver predicts a collision and depresses the brake, the brake depressing means 102 detects the depressing of the brake, and the brake assist 103 is activated to assist the depressing operation of the brake. At this time, the brake assist 103 assists the depression of the brake, and a detection signal relating to the depression of the brake is transmitted from the brake detection means 102 that has detected the depression of the brake to the control means 104. The control unit 104 that has received the detection signals from the radar 101 and the brake detection unit 102 transmits an operation command to the first pretensioner 105 a constituting the pretensioner 105. The first pretensioner 105a that has received the operation command generates the first tension F1 to primarily restrain the occupant. Further, when it is detected that the vehicle has actually collided by a vehicle body acceleration detecting means (G sensor: not shown) provided in the vehicle, a signal (collision signal) for notifying the detection of the collision is transmitted to the control means 104. Alternatively, the pretensioner 105, which is transmitted from another control device to the pretensioner 105 and receives the collision signal, determines whether the second tension needs to be actuated. When the pretensioner 105 determines that the second tension needs to be actuated, the second pretensioner 105b is actuated to generate the second tension F2 and secondarily restrain the occupant.

However, in the operation process of the pretensioner 105 in this conventional seat belt device, as shown in FIG. 9B, the second tension is applied from the state in which the first tension F1 is applied by the operation of the first pretensioner. By the operation of the pretensioner, the state continuously shifts to the state in which the second tension F2 is acting. Therefore, a very large impact force is instantaneously generated when the second tension F2 is generated at the time of collision detection (X in FIG. 9B). This impact force may cause the occupant to feel uncomfortable. Further, when it is severe, there is a possibility that an excessive force may act on the occupant due to the resultant force of the first tension and the second tension, and therefore it is necessary to set the first tension F1 low. Therefore, it is desired to further improve the purpose of sufficiently restraining and protecting the occupant during an original collision.
JP-A-6-255447 (Claim 1, FIG. 1) Japanese Patent No. 2946995 (Claim 1, FIG. 3)

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle seat belt device that reduces a shock applied to an occupant when a collision is detected and a transition is made from a restraint stage using a first tension to a restraint stage using a second tension. .

  According to a first aspect of the present invention, there is provided a seat belt to be mounted on an occupant seated on a seat provided in a vehicle, a collision prediction means for predicting a collision between the vehicle and an obstacle, and a collision detection means for detecting the collision. A first pretensioner that pulls the seat belt with a first tension and primarily restrains the occupant; a second pretensioner that pulls the seat belt with a second tension and secondarily restrains the occupant; and 1 pretensioner and pretensioner control means for controlling the operation of the second pretensioner, and the pretensioner control means operates the first pretensioner when a collision is predicted by the collision prediction means. When the collision is detected by the collision detection means while the primary tension is first restrained by the first tension and the primary restraint state by the first tension is continued, The first tension by the first pretensioner is released, and the operation timing of the second tension by the second pretensioner is controlled, so that the second tension passes from the primary restraint stage by the first tension to the tension relaxation stage. A vehicle seat belt device, which is shifted to a secondary restraint stage by tension, is a configuration of the invention.

  In this seat belt device, when a collision is detected after the collision is predicted, the second pretensioner is moved from the primary restraint stage using the first tension to the secondary restraint stage using the second tension through the tension relaxation stage. The shock applied to the occupant immediately after the operation is reduced.

  According to a second aspect of the present invention, there is provided a seat belt for a passenger seated on a seat provided in a vehicle, a collision prediction means for predicting a collision between the vehicle and an obstacle, and detecting the behavior of the vehicle. Vehicle behavior detecting means for detecting the collision, a first pretensioner for primarily restraining the occupant by taking the seat belt with a first tension, and taking the seat belt with a second tension. A second pretensioner for secondarily restraining the occupant; and pretensioner control means for controlling the operation of the first pretensioner and the second pretensioner. The pretensioner control means is based on the collision prediction means. Based on the detection signal related to the collision prediction and the detection signal related to the vehicle behavior by the vehicle behavior detection means, the operating force of the first tension by the first pretensioner is reduced. And when the collision detecting means detects the collision while the primary restraint state by the first tension is continued, the first tension by the first pretensioner is released and the second tension is released. A vehicle seat characterized by controlling the operation timing of the second tension by the pretensioner to shift from the primary restraint stage by the first tension to the secondary restraint stage by the second tension through the tension relaxation stage. The belt device is a configuration of the invention.

  In this seatbelt device, the pretensioner control means uses the first pretensioner to adjust the first tension based on the detection signal related to the collision prediction by the collision prediction means and the detection signal related to the vehicle behavior by the vehicle behavior detection means. By controlling the operating force and the operating process, the occupant is primarily restrained by the appropriate first tension according to the possibility of a collision and the abnormal situation of the vehicle behavior, and when a collision is detected after the collision is predicted, By shifting from the primary restraint stage using the first tension to the secondary restraint stage using the second tension through the tension relief stage, the impact applied to the occupant immediately after the operation of the second pretensioner is mitigated.

  Furthermore, the invention according to claim 3 is the seat belt device for a vehicle according to claim 2, wherein the pretensioner control means is configured to adjust the second tension according to an operation process of the first tension by the first pretensioner. The operation timing is controlled.

  In this seat belt device, the second tension is appropriately operated in accordance with the impending nature of the collision by controlling the operation timing of the second tension in accordance with the operation process of the first tension by the first pretensioner. Thus, the occupant can be secondarily restrained and protected, and the impact received by the occupant during the transition from the first tension to the second tension is reduced.

  According to the first aspect of the present invention, the second tension is further added to the first tension when the primary restraint stage by the first pretensioner shifts to the secondary restraint stage by the second pretensioner when a collision is detected. In addition, the impact received by the occupant can be alleviated and the discomfort experienced by the occupant can be suppressed. In addition, the driver can appropriately perform a driving operation such as a collision avoidance operation. In addition, the conventional technique solves the problem that the first tension has to be set low in order to prevent an excessive force from being applied to the occupant, and performs appropriate primary restraint with the first tension larger than the conventional tension. be able to. Furthermore, even if the pretensioner malfunctions, driving operations such as a collision avoidance operation can be appropriately performed. Further, the mechanical lock can be operated reliably.

  According to the invention described in claim 2, when the occupant is primarily restrained by the appropriate first tension according to the possibility of the collision and the abnormal situation of the vehicle behavior, and when the collision is detected after the collision prediction, When shifting from the primary restraint stage by the first pretensioner to the secondary restraint stage by the second pretensioner at the time of collision detection, the impact received by the occupant when the second tension is further applied to the first tension, A sense of discomfort experienced by the passenger can be suppressed.

  According to the third aspect of the invention, the second tension can be appropriately actuated according to the impending nature of the collision to protect the occupant by being secondarily restrained and from the first tension to the second tension. The impact received by the occupant during the transition of the vehicle is mitigated, the discomfort received by the occupant is suppressed, and a time for appropriately performing the driving operation of the occupant such as the collision avoidance operation can be secured.

  Hereinafter, a first embodiment and a second embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a conceptual diagram showing a configuration of a vehicle seat belt device according to a first embodiment of the present invention.
A seat belt device 1 having the configuration shown in FIG. 1 includes a seat belt 2 to be attached to a passenger seated in a seat S provided in a vehicle C, a collision prediction means 3, a collision detection means 5, a first pre- A pretensioner 8 including a tensioner 6 and a second pretensioner 7 and pretensioner control means 9 are provided.

  In the seat belt 2, the webbing W drawn upward from a second pretensioner 7 provided at the lower end of a center pillar (not shown) of the vehicle C is inclined downward through a shoulder belt anchor 10 provided at the upper end of the center pillar. It has a shoulder belt portion 11 formed by extending and a waist belt portion 13 formed by folding the webbing W with a tongue plate 12. The tip of the webbing W constituting the waist belt portion 13 is connected to the first pretensioner 6. Further, the tongue plate 12 is connected to a buckle 14 erected on the floor surface of the vehicle C when the seat belt 2 is attached to an occupant seated in the seat S.

  The pretensioner 8 includes a first pretensioner 6 that operates the first tension to primarily restrain the occupant, a second pretensioner 7 that operates the second tension and secondarily restrains the occupant, and pretensioner control means 9. It consists of.

  The first pretensioner 6 has a winding shaft (not shown) around which the tip of the webbing W forming the waist belt portion 13 is wound and is driven to rotate by a driving means such as a motor or a spring member. When the first pretensioner 6 receives a command signal from the pretensioner control means 9 at the time of collision prediction, the first pretensioner 6 rotates the take-up shaft by the drive means to wind up the webbing W constituting the waist belt portion 13. As a result, the seat belt 2 (the waist belt portion 13 and the shoulder belt portion 11) is taken up, and the first tension F1 is generated. The occupant seated on the seat S is primarily restrained by the first tension F1 (primary restraint stage).

  The second pretensioner 7 locks the withdrawal of the webbing W due to the inertial force acting on the occupant at the time of a vehicle collision, and can normally withdraw the webbing W freely. The second pretensioner 7 is connected to one end of the shoulder belt portion 11, and when a command signal is input from the pretensioner control means 9 at the time of collision detection, the shoulder belt portion 11 is instantaneously wound up and the second tension is applied. Is generated to restrain the occupant secondary. The second pretensioner 7 instantaneously rotationally drives a take-up shaft (not shown) around which one end of the shoulder belt portion 11 is wound with explosive force using explosives, high-pressure gas, a spring or the like. A device for winding the webbing W constituting the shoulder belt portion 11 is used. The second pretensioner 7 is not particularly limited, and a known device can be used.

As the second pretensioner 7, for example, a winding device 21 shown in FIG. 2 can be used.
As shown in FIG. 2A, the winding device 21 is connected to the winding shaft 31 around which the one end 11a of the shoulder belt portion 11 is wound, and the winding shaft 31 is connected to the winding shaft 31 instantaneously. And an instantaneous take-up drive part 21a for taking up the shoulder belt part 11 by being rotationally driven.
As shown in the cross-sectional view of FIG. 2B, the instantaneous winding drive unit 21a includes a gas supply pipe 22 through which compressed air or high-pressure gas passes, a cylinder 23 connected to the gas supply pipe 22, and an inside of the cylinder 23. 2, a rack 25 provided integrally with the piston 24, a pinion 26 meshing with the rack 25, a rotation with the pinion 26 and a winding shaft 31 (FIG. 2). (See (a)) and a rotating shaft 27 connected through a plurality of gears. The pinion 26, the plurality of gears, and the rotating shaft 27 are accommodated in a case 28. Further, a return spring 29 is interposed between the piston 24 and the case 28 in order to push back the piston 24 and the rack 25 moved by the compressed air or high-pressure gas blown into the cylinder 23.

  The winding device 21 is configured to wind the webbing W constituting the shoulder belt portion 11 around the winding shaft 31 by compressed air or high-pressure gas supplied from a gas supply portion (not shown) through the gas supply pipe 22. Two tensions are generated to restrain the occupant when the vehicle collides.

  The collision predicting means 3 is arranged at the front part of the vehicle C and detects the possibility of collision between the host vehicle and an obstacle such as a preceding vehicle. For example, a laser, radar, ultrasonic sensor, etc. A device that measures the distance between the vehicle and the obstacle every predetermined time by a non-contact type distance sensor can be used. If the non-contact type distance sensor is embedded in a bumper or the like at the front of the vehicle, it is effective for detecting obstacles ahead, and it is preferable to arrange not only one but a plurality on the body surface in the direction in which a collision is expected. .

  In this collision prediction means 3, the relative speed is calculated from the temporal change in the distance between the host vehicle and the obstacle measured every predetermined time. Then, the distance is divided by the relative speed to calculate the time until the collision. For example, if the time is equal to or less than a predetermined time (threshold value) set in advance, a collision prediction detection signal is generated as the possibility of a collision. And output to the pretensioner control means 9 provided in the pretensioner 8.

  The collision detection means 5 detects a collision between the host vehicle and an obstacle such as another vehicle. For example, the collision detection means 5 is disposed at the center of the vehicle body, the front seat left and right, the rear seat left and right, etc., and the vehicle C collides with the obstacle. When acceleration exceeding a predetermined threshold acts on the vehicle body, it is possible to use a sensor having a contact that detects and closes this acceleration. When this contact is closed, a collision detection signal is output to the pretensioner control means 9.

  The pretensioner control means 9 controls the operation of the first pretensioner 6 and the second pretensioner 7. The pretensioner control means 9 detects the collision prediction from the collision prediction means 3 and the collision detection means 5. A collision detection signal is input to control the operation of the first pretensioner 6 and the second pretensioner 7. When the pre-tensioner control means 9 receives a collision prediction detection signal from the collision prediction means 3 that has predicted a collision, it outputs a command signal to the first pre-tensioner 6 of the pre-tensioner 8 to operate the first pre-tensioner 6. . Thereby, the primary restraint of the passenger by the first tension is performed.

  Further, when a collision detection signal is input from the collision detection unit 5 that has detected a collision, the pretensioner control unit 9 outputs a command signal to the first pretensioner 6 of the pretensioner 8 to release the first tension. At the same time, a command signal is output to the second pretensioner 7 to operate the second pretensioner 7. At this time, the pretensioner control means 9 controls the operation timing of the second tension by the second pretensioner 7 so that the secondary restraint stage by the second tension passes from the primary restraint stage by the first tension to the tension relaxation stage. The operation timing of the second tension is controlled so as to shift to. That is, the pretensioner control means 9 stops the operation of the first pretensioner 6 and releases the first tension, and adjusts the operation time of the second tension, thereby changing from the primary restraint stage to the secondary restraint stage. The degree of tension relaxation and the duration of tension relaxation in the tension relaxation stage during the transition to (1) are adjusted.

Next, the operation mechanism of the seat belt device 1 described above will be described.
FIG. 3 is a block diagram for explaining an operation mechanism of the seat belt device 1.
In this seat belt device 1, the collision prediction means 3 measures the distance between the own vehicle and the obstacle every predetermined time, and calculates the relative speed between the own vehicle and the obstacle from the temporal change. Then, the time until the collision is calculated by dividing the distance by the relative speed, and if the calculated time is equal to or less than a predetermined time (threshold value) set in advance, a collision prediction detection signal that there is a possibility of a collision Is output to the pretensioner control means 9 of the pretensioner 8. When the pretensioner control means 9 to which the collision prediction detection signal is input determines that the operation of the first pretensioner 6 is necessary, it outputs a command signal to the first pretensioner 6. The first pretensioner 6 to which the command signal is input from the pretensioner control means 9 takes up the webbing W by rotating the take-up shaft by the drive means. As a result, the seat belt 2 (the waist belt portion 13 and the shoulder belt portion 11) is taken up, and the first tension F1 is generated as shown in FIG. The slack of the waist belt portion 13 is completely eliminated by the first tension F1, the slack of the shoulder belt portion 11 is also eliminated to some extent through the tongue plate 12, and the occupant seated in the seat S is primary. Restrained (primary restraint stage).

  On the other hand, when the vehicle C collides with an obstacle and an acceleration greater than a predetermined threshold acts on the vehicle body, the collision detection means 5 is provided with individual sensors arranged at the center of the vehicle body, the front seat left and right, the rear seat left and right, etc. Detects the acceleration, closes the contact, and closes the contact, thereby outputting a collision detection signal to the pretensioner control means 9 of the pretensioner 8.

  The pretensioner control unit 9 to which the collision detection signal is input from the collision detection unit 5 outputs a command signal to the second pretensioner 7. The second pretensioner 7 to which the command signal is input from the pretensioner control means 9 instantaneously rotationally drives the rapid take-up drive device to take up the webbing W of the shoulder belt portion 11 and, as shown in FIG. The second tension F2 is generated following the primary restraint stage by the first tension to restrain the occupant at the time of the vehicle collision (secondary restraint stage).

  If no collision is detected by the collision detection means 5 for a predetermined time in the primary restraint stage, the pretensioner control means 9 does not output a command signal for operating the second pretensioner 7, and the first pretensioner 6 is released and the restraint of the passenger by the seat belt 2 is stopped. Accordingly, the driving operation of the occupant is not hindered by the seat belt in a state where there is no collision or abnormality in the vehicle behavior, and it is possible to minimize the uncomfortable feeling that the occupant receives by wearing the seat belt.

  At this time, when the collision is detected by the detection signal from the collision detection unit 5 after the collision prediction unit 3 predicts the collision, the pretensioner control unit 9 performs the first tension by the first pretensioner 6 as shown in FIG. , And the second pretensioner 7 controls the operation timing of the second tension (second pretensioner operation) so that the second tension passes from the primary restraint stage to the tension relaxation stage. Control is performed so as to shift to the secondary restraint stage by tension. The operation timing of the second tension is performed in the order of collision detection → release of the first tension F1 by the first pretensioner 6 → generation of the second tension by the operation of the second pretensioner 7. At this time, the pretensioner control means 9 controls the release of the operation of the first tension by the first pretensioner 6 and the operation timing of the second tension by the second pretensioner 7. Accordingly, as shown in FIG. 5, a tension relaxation stage TR is formed in the transition stage from the primary restraint stage A to the secondary restraint stage B. That is, the pretensioner control means 9 controls the time (x + y) from the collision prediction by the collision prediction means 3 to the release of the first tension, as shown in FIG. By controlling the time (z) until the time of operation and controlling the time (t) from the release of the first tension to the operation of the second tension, the duration of the tension relaxation stage TR is adjusted.

The operation of the seat belt apparatus 1 will be described with reference to FIG. 6. First, (a) during normal running, the seat belt 2 attached to the occupant seated on the seat is attached to the shoulder belt portion 11 and the waist belt portion 13. The first pretensioner 6 or the second pretensioner 7 acts on the tension TW that eliminates the sagging of the webbing W.
When a collision is predicted ((b) at the time of a collision prediction), the first pretensioner 6 is actuated, the seat belt 2 is pulled by the first tension F1, and the occupant is primarily restrained (primary restraining stage).
Next, when a collision is detected ((c) at the time of collision detection), the second pretensioner 7 is actuated, the seat belt 2 is taken up by the second tension F2, and the occupant is secondarily restrained (secondary restraint). Stage).

  As described above, the movement of the lower body of the occupant is effectively prevented and the slack of the shoulder belt portion 11 is eliminated in advance, so that the movement of the upper body is small, and the occupant is effectively able to cooperate with the airbag or the like. Protected.

  At this time, as shown in the lower part of FIG. 6, when the operation state (primary restraint stage) of the first pretensioner 6 shifts to the operation state (secondary restraint stage) of the second pretensioner 7 when a collision is detected. By forming the tension relaxation stage TR, the impact due to the operation of the second pretensioner 7 is mitigated, the uncomfortable feeling received by the occupant is suppressed, and the influence on the driving operation such as the collision avoidance operation of the driver is suppressed. Can be reduced. In addition, an excessive force that is instantaneously generated when the second tension F2 is activated can be prevented. Conventionally, it is possible to solve the problem that the first tension F1 has to be set low in order to suppress excessive force, and it is possible to generate the first tension F1 that is larger than the conventional one. Furthermore, in the unlikely event that the second pretensioner 7 malfunctions, a driving operation such as a collision avoidance operation can be appropriately performed. Further, the mechanical lock can be operated reliably.

Next, a seat belt device according to a second embodiment of the present invention will be described with reference to FIGS.
FIG. 7 is a block diagram showing the configuration of the seat belt device according to the second embodiment of the present invention.
7 includes a seat belt 2, a collision prediction unit 3, a collision detection unit 5, a pretensioner 8 including a first pretensioner 6 and a second pretensioner 7, and pretensioner control. It has the same configuration as that of the first embodiment in that it includes means 9, and has a different configuration from that of the first embodiment in that it includes vehicle behavior detection means 4. Therefore, in the following description, overlapping description of the same configuration as that of the first embodiment is omitted.

  Further, the vehicle behavior detecting means 4 detects the behavior of the vehicle in the front-rear direction and the lateral direction, and detects abnormality in the vehicle behavior due to sudden acceleration / deceleration, side slip, rotation, sudden steering, etc. of the vehicle. As the vehicle behavior detecting means 4, an acceleration sensor that detects accelerations in the longitudinal direction and the lateral direction of the vehicle body can be used. This acceleration sensor detects the magnitude and direction of the vehicle body acceleration, the rate of change, and the like, and can detect an abnormality in the vehicle behavior by comparing with a predetermined threshold value. As the acceleration sensor, a sensor equipped in a device that performs various controls of the vehicle can be used. For example, an acceleration sensor provided in an ABS (anti-lock brake system) that detects the brake signal or deceleration during vehicle braking and controls the operation of the brake may be used.

  When the vehicle behavior detection unit 4 detects an abnormality in the vehicle behavior, a detection signal related to the abnormality in the vehicle behavior is output to the pretensioner control unit 9.

  In this seat belt device 17, the pretensioner control means 9 controls the operation of the first pretensioner 6 and the second pretensioner 7, and a collision prediction detection signal and vehicle behavior detection from the collision prediction means 3. The operations of the first pretensioner 6 and the second pretensioner 7 are controlled based on the detection signal regarding the vehicle behavior from the means 4 and the detection signal of the collision from the collision detection means 5.

The pretensioner control means 9 has a first pre-control according to whether or not a collision prediction detection signal is input from the collision prediction means 3 and whether or not a detection signal related to a vehicle behavior abnormality is input from the vehicle behavior detection means 4. The operating force and the operating process of the first tension by the tensioner 6 are controlled. For example, the pretensioner control means 9 determines the necessity of the operation of the first pretensioner 6 and the operation process according to Case 1 to Case 4 shown in Table 1 below, and applies the first tension F1 to the first pretensioner 6. Command signals are output for the actuation force and actuation process of (F12, F13, F14). Here, it is assumed that F12 <F13 <F14. For example, the magnitudes of the tensions F12 and F13 are set to 40 to 60% and 60 to 80% of the first tension F14, respectively.

(1) Case 1: When a collision prediction detection signal is not input from the collision prediction means 3 (NO) and a detection signal regarding abnormality in vehicle behavior is not input from the vehicle behavior detection means 4 (NO), pretensioner control is performed. The means 9 does not output a command signal to the first pretensioner 6. At this time, the first tension is not acting on the occupant.

(2) Case 2: When a collision prediction detection signal is input from the collision prediction means 3 (YES) and no detection signal regarding abnormality in vehicle behavior is input from the vehicle behavior detection means 4 (NO), the pretensioner control means 9 Transmits a command signal to the first pretensioner 6 to operate the first tension F12.

(3) Case 3: Pre-tensioner control when a collision prediction detection signal is not input from the collision prediction means 3 (NO) and a detection signal related to an abnormality in vehicle behavior is input from the vehicle behavior detection means 4 (YES) The means 9 outputs a command signal to the first pretensioner 6 to activate the first tension F13.

(4) Case 4: When a collision prediction detection signal is input from the collision prediction means 3 (YES) and a detection signal related to an abnormality in vehicle behavior is also input from the vehicle behavior detection means 4 (YES), pretensioner control The means 9 sends a command signal to the first pretensioner 6 to actuate the first tension F14.

  Further, when the pretensioner control means 9 is in the stage of Case 1, Case 2 or Case 3, that is, any of the unconstrained state, the restrained state by the tension F12, or the restrained state by the tension F13, the collision prediction is further performed. When a detection signal for predicting a collision from the means 3 or a detection signal related to an abnormality in the vehicle behavior from the vehicle behavior detection means 4 is input and the Case 4 state is entered, a command signal for operating the first tension F14 corresponding to the Case 4 Is output to the first pretensioner 6. In this manner, the first pretensioner 6 pulls the webbing W of the seat belt based on the presence / absence of a collision prediction detection signal from the collision prediction means 3 and the presence / absence of collision detection based on the detection signal related to the vehicle body acceleration from the vehicle body acceleration detection means 4. The magnitude of the tension is controlled, and further, the operation timing from Case 2 to Case 4 or the operation timing from Case 3 to Case 4 is switched, that is, the tension is switched from the tension F12 to F14, or the tension F13 is switched to the tension F14. If the timing is appropriately controlled by the pretensioner control means 9, the occupant can be restrained more appropriately in preparation for a collision.

  When the collision detection signal is input from the collision detection unit 5 that has detected a collision, the pretensioner control unit 9 outputs a command signal to the first pretensioner 6 of the pretensioner 8 to output the first tension (F12, F13, F14) is released, and a command signal is output to the second pretensioner 7 to operate the second pretensioner 7. At this time, the pretensioner control means 9 controls the operation timing of the second tension F2 by the second pretensioner 7, and the secondary tension by the second tension F2 passes from the primary restraint stage by the first tension to the tension relaxation stage. The operation timing of the second tension F2 is controlled so as to shift to the restraining stage. The operation timing of the second tension F2 is performed in the order of collision detection → release of the first tension F1 (F12, F13, F14) by the first pretensioner 6 → generation of the second tension F2 by the operation of the second pretensioner 7. At this time, the pretensioner control means 9 controls the release of the operation of the first tension F1 (F12, F13, F14) by the first pretensioner 6 and the operation timing of the second tension F2 by the second pretensioner 7. .

At this time, it is preferable that the pretensioner control means 9 controls the operation timing of the second tension F2 according to the operation process of the first tension by the first pretensioner 6. That is, when the transition from the primary restraint stage in Case 2, Case 3 or Case 4 to the secondary restraint stage through the tension relaxation stage or from the non-restraint stage of Case 1 to the secondary restraint stage, the second pretensioner 7 The operation timing of the second tension F2 is controlled. For example, the operation timing of the second tension F2 is controlled according to the following case.
(1) When a collision is detected from the Case1 stage, as shown in FIG. 8A, the state is shifted from the state where the first tension F1 is not applied to the secondary restraint stage where the second tension F2 is applied. .
(2) When a collision is detected from the Case2 stage, as shown in FIG. 8B, the state moves from the state in which the tension F12 is applied to the secondary restraint stage in which the second tension F2 is applied.
(3) When a collision is detected from the Case3 stage, as shown in FIG. 8C, the stage moves from the stage where the tension F13 is applied to the secondary restraint stage where the second tension F2 is applied.
(4) When a collision is detected from the Case4 stage, as shown in FIG. 8D, the stage moves from the stage where the tension F14 is applied to the secondary restraint stage where the second tension F2 is applied.
(5) After a transition from the Case 2 or Case 3 stage to the Case 4 stage, if a collision is detected, as shown in FIG. 8 (e) or FIG. 8 (f), from the stage where the tension F14 is acting. The process proceeds to the secondary restraint stage where the second tension acts.

  According to these five cases, the pretensioner control means 9 controls the operation timing of the second pretensioner 7. For example, as shown in FIGS. 8A to 8F, the operation time t1 of the second tension F2 by the second pretensioner 7 from the collision detection time t0 from the non-restraining stage where the first tension F1 is not operating. , And during the operation of the first tension F1 (F12, F13, F14), the time from the collision detection time t0 to the operation timing t2, t3, t4, t5 of the second tension F2 by the second pretensioner 7. T1, T2, T3, T4, and T5 are shortened in the order of T1> T2> T3> T4> T5. That is, the operation timing of the second pretensioner 7 is advanced in the order of Case1 <Case2 <Case3 <Case4 (for example, Case2: coefficient = 0.9, Case3: coefficient = 0.8, Case4: K = 0.7). As a result, the second tension F2 can be appropriately actuated according to the impending nature of the collision to protect the occupant by being secondarily restrained, and the second tension can be protected from the first tension F1 (F12, F13, F14). The impact received by the occupant during the transition to F2 is mitigated.

  When no collision is detected by the collision detection unit 5 for a predetermined time at the stage of Case 2, Case 3 or Case 4, the pretensioner control unit 14 does not output a command signal for operating the second pretensioner 7, and 1 The operation of the pretensioner 6 is released, and the restraint of the occupant by the seat belt 2 is stopped. Accordingly, the driving operation of the occupant is not hindered by the seat belt 1 in a state where there is no collision or vehicle behavior abnormality, and the uncomfortable feeling that the occupant receives by wearing the seat belt can be minimized.

It is a conceptual diagram which shows the structure of the seatbelt apparatus in 1st Embodiment of this invention. (A) is a schematic diagram which shows the rapid winding apparatus which is an example of a 2nd pretensioner, (b) is sectional drawing which shows the structure of the rapid winding apparatus. It is a block diagram explaining the action | operation mechanism of the seatbelt apparatus of 1st Embodiment. It is a figure which shows the action | operation process of the tension | tensile_strength in the seatbelt apparatus of 1st Embodiment. It is a figure explaining the tension relaxation step in the seat belt device of the first embodiment. It is a conceptual diagram explaining the action | operation of the seatbelt apparatus of 1st Embodiment. It is a block diagram which shows the structure of the seatbelt apparatus which concerns on 2nd Embodiment of this invention. (A)-(f) is a figure which shows the action process example of the tension | tensile_strength in the seatbelt apparatus which shows a structure in FIG. (A) is a block diagram which shows the structure of the conventional seatbelt apparatus, (b) is a figure explaining the operation | movement process of the conventional seatbelt apparatus.

Explanation of symbols

1,17 Seat belt device 2 Seat belt 3 Collision prediction means 3 Case
4 Vehicle Behavior Detection Unit 5 Collision Detection Unit 6 First Pretensioner 7 Second Pretensioner 8 Pretensioner 9 Pretensioner Control Unit S Seat TR Mitigation Stage W Webbing

Claims (3)

A seat belt to be mounted on an occupant seated on a seat provided in a vehicle, a collision prediction unit for predicting a collision between the vehicle and an obstacle, a collision detection unit for detecting the collision, and the first tension on the seat belt A first pretensioner that takes over the occupant in a primary restraint, a second pretensioner that takes over the seat belt with a second tension to restrain the occupant in a secondary manner, and the first pretensioner and the second pretensioner. Pretensioner control means for controlling the operation of
When the collision is predicted by the collision prediction means, the pretensioner control means operates the first pretensioner to primarily restrain the occupant with a first tension, and a primary restraint state with the first tension. When a collision is detected by the collision detection means while the first pretensioner is released, the first tension by the first pretensioner is released and the operation timing of the second tension by the second pretensioner is controlled. A seat belt device for a vehicle, wherein a transition is made from a primary restraint stage by tension to a secondary restraint stage by the second tension through a tension relaxation stage. A seat belt to be attached to an occupant seated on a seat provided in the vehicle, a collision prediction means for predicting a collision between the vehicle and an obstacle, a vehicle behavior detection means for detecting the behavior of the vehicle, and the collision detection A collision detecting means, a first pretensioner that pulls the seat belt with a first tension to primarily restrain the occupant, and a second pretensioner that pulls the seat belt with a second tension and secondarily restrains the occupant. And pretensioner control means for controlling the operation of the first pretensioner and the second pretensioner,
The pretensioner control means is based on a detection signal related to collision prediction by the collision prediction means and a detection signal related to vehicle behavior from the vehicle behavior detection means, and the operating force and operation process of the first tension by the first pretensioner. And when the collision is detected by the collision detection means while the primary restraint state by the first tension is continued, the first tension by the first pretensioner is released and the second pretensioner A vehicle seat belt device, wherein the operation timing of the second tension is controlled to shift from the primary restraint stage by the first tension to the secondary restraint stage by the second tension through a tension relaxation stage.   The vehicle seat belt device according to claim 2, wherein the pretensioner control means controls an operation timing of the second tension according to an operation process of the first tension by the first pretensioner.

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