JP5164586B2 - Vehicle seat belt device - Google Patents

Description

  The present invention relates to a vehicle seat belt device, and more particularly, to a vehicle seat belt device suitable for suppressing forward movement due to rebound by tightening a seat belt at a timing when an occupant moves rearward in a rear collision.

  Conventionally, a seat belt pretensioner device has been put into practical use as a seat belt tightening device in a vehicle seat belt device, and is widely installed in commercial vehicles. The seat belt tightening device includes a collision detection device and a control unit that tightens the seat belt based on a detection signal output from the collision detection device. The seat belt tightening device limits the forward movement of the occupant sitting on the seat and reduces the forward movement amount by removing the slack of the seat belt at the time of the collision.

In the above-described seat belt tightening device, in the case of a rear collision among the collisions, the occupant's rear head and back are restrained or brought close to the seat back immediately before the rear collision or simultaneously with the occurrence of the rear collision. An apparatus for alleviating overextension (backward bending) of parts has been proposed (Patent Documents 1, 2, etc.). These devices include a device for predicting a rear collision or a device for detecting a rear collision, a pretensioner device, and a control device for controlling the operation of the pretensioner device based on the prediction signal or the detection signal. Restrain the movement. The configuration of the conventional apparatus is controlled to operate immediately when a rear collision is predicted or detected, tension is applied to the seat belt to restrain the occupant to the seat back of the seat, and the head to the rear in the passenger compartment. Reduce exercise.
Japanese Patent No. 3721451 Japanese Patent No. 3837909

  In the case of a rear collision, particularly in the case of a rear collision, the occupant moves backward in the passenger compartment due to the acceleration at the time of the collision and is pressed against the seat back of the seat, and then rebounds due to the elasticity of the seat back and moves forward. To do. For this reason, in the second half of the rear collision, there is a possibility that a vehicle interior secondary collision will occur due to rebound. Especially for small passengers or passengers with a physique different from the standard body type, for example, passengers whose chest and abdomen are larger than the average, the distance from the front panel and the steering wheel is already relatively close when seated during normal driving. Therefore, the possibility of contact by rebound is great.

  In consideration of the above-mentioned conventional device, the pretensioner device is operated immediately after the prediction or detection of the rear collision so that the belt tightening control is completed. There will be slack between the passenger and the passenger. In this regard, the conventional apparatus does not consider at all. Accordingly, it is not possible to expect an effect of sufficiently suppressing the forward movement of the occupant due to the subsequent rebound.

  In addition, the device disclosed in Patent Document 1 described above reduces the belt winding force, that is, the seat belt load, in order to reduce the excessive bending (forward bending) of the neck due to rebound in a state where the occupant is restrained. As a result, the forward movement is further increased.

  In view of the above problems, an object of the present invention is to provide a vehicle seat belt device capable of minimizing the forward movement of an occupant after rebound in a rear collision and reducing a secondary collision in a passenger compartment. It is in.

  In order to achieve the above object, a vehicle seat belt apparatus according to the present invention is configured as follows.

A seat belt device for a first vehicle (corresponding to claim 1) detects a belt collision around which a belt is wound, an actuator that winds the belt by rotating the belt reel, and a rear collision of the vehicle. Rear collision detection means, and control means for controlling the belt winding operation by the actuator based on the detection signal from the rear collision detection means. The control means includes a timer means for measuring a time from the time when the rear collision detection means detects the rear collision, and an occupant movement in a direction opposite to the acceleration generated by the rear collision based on the time measured by the timer means. A signal delay means for outputting a signal delayed by a delay time corresponding to a time that is a maximum time and does not depend on the acceleration, and a belt at the time of a rear collision that operates the actuator based on a signal output from the signal delay means Tightening control means.

  In the above-described vehicle seat belt device, for example, when a rear collision such as a rear-end collision occurs in a traveling or stopped vehicle, the occupant sitting on the seat performs the backward motion by inertial motion based on the delay action of the signal delay means. The belt is tightened at the position moved backward. As a result, it is possible to tighten the belt at an optimal timing at the time of the rear collision, to minimize the forward movement of the occupant after the rebound in the rear collision, and to reduce the secondary collision in the vehicle interior.

  A seat belt device for a second vehicle (corresponding to claim 2) is provided with mass detecting means for detecting an occupant mass in the first device configuration, and the control means is an occupant detected by the mass detecting means. It is characterized by comprising delay time adjusting means for adjusting the delay time set by the signal delay means based on the mass. According to this configuration, an optimal delay time can be set according to the occupant's physique and weight, and the belt can be tightened at an optimal timing according to the occupant during a rear collision.

  In a third vehicle seat belt apparatus (corresponding to claim 3), in the above apparatus configuration, the signal delay means includes means for subtracting a margin time corresponding to the operating time of the actuator from a predetermined delay time. It is characterized by including. With this configuration, even when a detection delay occurs in the rear collision detection means, the belt can be tightened at the best possible timing.

  A seatbelt device for a fourth vehicle (corresponding to claim 4) further includes a rear collision prediction means for detecting the possibility of a rear collision of the vehicle in the above-described device configuration, and the actuator is configured to generate an explosive thrust. A first actuator that winds the belt using, and a second actuator that reversibly winds the belt by using the driving force of the motor. When a rear collision is detected by the second control means for driving the second actuator based on a detection signal output from the rear collision prediction means to control the belt to a driving state in a preliminary restrained state, and the rear collision detection means. And a first control means for controlling the operation of the first actuator based on a delay time corresponding to the preliminary restrained state. According to this configuration, when a rear collision occurs, the rear collision can be predicted in advance and the preliminarily restrained driving state can be maintained, and the belt can be tightened more appropriately when the rear collision occurs.

  According to a fifth vehicle seat belt apparatus (corresponding to claim 5), in the above apparatus configuration, the control means outputs the output of the second actuator when the rear collision detection means detects the rear collision when the second actuator is operated. In this case, the first actuator is driven after a delay time.

  In the seat belt device for a sixth vehicle (corresponding to claim 6), in the above-described device configuration, the control means uses information on the winding state detecting means for detecting the tension or the winding amount when the second actuator is operated. And a correction means for correcting the delay time.

  According to the present invention, in a vehicle seat belt device, for example, when a rear collision such as a rear-end collision occurs in a traveling vehicle, the occupant sitting on the seat performs a backward motion by inertial motion based on the delay action of the signal delay means. Since the belt tightening operation is performed at the position moved rearward, the belt tightening is performed at an optimal timing at the time of a rear collision, and the belt restraining the occupant may be slack particularly at the time when rebound may occur. In addition, the forward movement of the occupant after the rebound in the rear collision can be suppressed to the minimum, and the secondary collision in the passenger compartment can be reduced. Even if the seatbelt load is reduced to allow the occupant to move forward and reduce the forward bending of the neck due to rebound, the occupant must load the belt load from the state where he / she has moved most backward. Since it moves forward while receiving it, more rebound energy can be absorbed, the amount of occupant movement is reduced, and the possibility of a secondary collision in the passenger compartment can be reduced.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments (examples) of the present invention will be described below with reference to the accompanying drawings.

  A first embodiment of a vehicle seat belt apparatus according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a schematic overall view of a vehicle as viewed from the side and an internal configuration of the control device, and FIG. 2 shows a flowchart showing a flow of processing executed by the control device.

  In FIG. 1, a vehicle 11 is, for example, a passenger car that is running, and shows a state where an occupant (driver) 13 sits on a driver seat (seat) 12 and is driving the running vehicle 11. Yes. 11A is a front part of the vehicle body, 11B is a rear part of the vehicle body, 14 is a wheel, and 15 is a steering handle. The seat 12 includes a stool portion 12a on which an occupant 13 sits and a seat back 12b that leans back. A seat belt device 20 is mounted on the driver seat 12. The seat belt device 20 includes a belt (seat belt or webbing) 21 that restrains the body of the occupant 13 to the seat 12. The belt 21 includes a belt portion 21 a that restrains the upper body of the occupant 13 and a belt portion (not shown) that restrains the waist of the occupant 13. One end of the lower side of the belt 21 is fixed to a vehicle body portion at the lower part of the passenger compartment of the vehicle 11 by an anchor plate 22. The upper end portion of the belt portion 21 a is folded back by a through anchor 23 provided near the shoulder of the occupant 13, and the end portion is connected to the belt tightening device 30. The belt tightening device 30 includes a belt reel 31 that is connected to the end of the belt portion 21a and wound thereon, and an actuator 32 that winds the belt 21 by rotationally driving the belt reel 31.

  The actuator 32 of the belt tightening device 30 has the same function as a general pretensioner device. As the actuator 32 of the belt tightening device 30, for example, a gunpowder actuator (powder device) that operates with a propellant thrust, or a response speed smaller than the gunpowder thrust, but a reversible (forward or reverse) winding operation. An electric motor or the like that can be used is used. The actuator 32 can be configured using either one or both of a gunpowder actuator and an electric motor. In practice, it is preferable to use an electric motor as the actuator 32 in normal seat belt control, and it is preferable to use a gunpowder actuator in emergency seat belt control at the time of rear-end collision.

  The control device 40 is a device that controls the operation of the actuator 32 of the belt tightening device 30. An object of control by the control device 40 is an actuator 32, and the actuator 32 is located on the output side of the control device 40. The control of the belt tightening device 30 by the control device 40 is based on a detection signal output from the collision detection unit 51 disposed in the vehicle rear portion 11B.

  For example, the collision detection unit 51 is disposed at the center of a bumper portion or the like on the rear surface of the vehicle. The collision detection unit 51 installed in the vehicle rear portion 11B is a sensor for detecting a rear collision (or rear collision), and an arbitrary detection mechanism can be provided. The “rear collision” is, for example, a rear-end collision by another vehicle from behind the vehicle 11, and is simply referred to as “rear collision” in the following description. A detection signal output from the collision detection unit 51 is input to the input unit 401 of the control device 40.

  The control device 40 that controls the operation of the actuator 32 of the belt tightening device 30 is configured to include an input unit 401, an output unit 402, a signal delay unit 403, and a belt tightening control unit 404. The signal delay unit 403 includes timer means. When the detection signal related to the rear collision is output from the collision detection unit 51, the signal delay unit 403 inputs the detection signal and delays the belt for a predetermined time using the time measurement information output from the timer unit, thereby controlling the belt tightening. A function of supplying to the unit 404. The belt tightening control unit 404 generates and outputs a control command signal based on the detection signal from the collision detection unit 51 supplied from the signal delay unit 403. A drive signal based on this control command signal is supplied to the actuator 32 via the output unit 402.

  The control device 40 includes an electric circuit portion and a computer portion in actual production. The input unit 401 and the output unit 402 are provided with I / O circuits. A belt tightening control unit 404 that generates a control command signal based on an input signal is an arithmetic processing unit that executes a program for controlling belt tightening at the time of a rear collision, as will be described later. This arithmetic processing unit is a computer (CPU). Etc.). The timer means included in the signal delay unit 403 uses a timekeeping function of a computer. In order to generate a drive signal based on a control command signal output from the belt tightening control unit 404, a power supply circuit, an amplifier circuit, and the like are provided.

  In FIG. 1, for convenience of explanation, the control device 40 is taken out from the outside of the vehicle 11 and illustrated, but actually, it is installed as an electronic control unit at an appropriate location on the vehicle 11.

  The following belt tightening control is performed by the signal delay unit 403 and the belt tightening control unit 404 as components included in the control device 40. The contents of the control are shown in the flowchart of FIG.

  First, a detection signal output from the collision detection unit 51 is input (step S11), and it is determined whether or not a rear collision has occurred based on the detection signal (step S12). If NO in determination step S12, the detection signal is continuously input and normal seat belt control is executed. The normal seat belt control is executed by a route different from the detection signal input processing from the collision detection unit 51, and is not shown in the flowchart of FIG. When the collision detection unit 51 detects a rear collision and the detection signal is output, that is, when the determination step S11 is YES, the signal delay unit 403 delays the detection signal for a predetermined time, and then transmits the detection signal to the belt. This is given to the tightening control unit 404. As a flow of this process, a timer (counter) is started and the delay time t is counted (step S13), and it is determined whether or not the delay time t exceeds a predetermined time (T1) (determination step S14). When the determination in step S14 is YES, the detection signal from the rear collision detection unit 51 is given to the belt tightening control unit 404, and the belt tightening control unit 404 generates a control command signal. That is, step S15 is executed.

  When the delay time t does not exceed the predetermined time T1 as a result, the detection signal related to the rear collision disappears, and the emergency seat belt control by the actuator 32 is not performed as a malfunction, and the normal seat belt control is performed. It is executed continuously.

  The “predetermined time T1” for delay set by the signal delay unit 403 is a time during which the occupant 13 sitting on the seat 12 moves backward in the vehicle interior and moves most backward due to a rear collision. Therefore, the belt tightening control unit 404 functions to operate the actuator 32 of the belt tightening device 30 at the time when the occupant 13 moves rearward and moves rearward most when the collision detection unit 51 detects a rear collision. To do. That is, in the next step S15, a control command signal for commanding the operation of the actuator 32 is output.

  The belt tightening control unit 404 for the vehicle seat belt device 20 according to the present embodiment functions as belt tightening control means (rear collision belt tightening control means) when a rear collision occurs in the vehicle 11. .

  Here, the time calendar (S (t)) of the backward movement or movement of the occupant 13 sitting on the seat 12 will be described. The time calendar can be considered to approximate the response of a one-dimensional spring mass model composed of the equivalent mass of the occupant 13 and the spring constant (k) of the seat back 12b. The vehicle acceleration (G) at the time of input, that is, the collision is almost constant (particularly in the case of a driver's seat, because it is limited to an adult). (T) is a functional form of S (t) = (1-cosωt) G / ω ^ 2 (where ω = (k / m) ^ 0.5). As a result, the time when the occupant 13 moves most backward, that is, a suitable delay time (Tdelay) is one-fourth of the natural period. Therefore, the delay time by the signal delay unit 403 can be uniquely determined regardless of the vehicle body acceleration. That is, Tdelay = π / ω. Accordingly, the seat belt 21 can be tightened almost optimally at the time of a rear collision only by setting a certain delay time by a simple time measuring function unit or a delay circuit. Therefore, it is possible to suppress the forward movement of the occupant 13 after rebound using an inexpensive system and reduce the secondary collision in the vehicle interior.

  In the above time calendar, the delay time is set with the peak value of the change characteristic. However, considering the detection delay, the delay time is set to the required time before the above Tdelay (= π / ω). It is also desirable to determine the time before Tdelay (= π / ω) by determining the width (margin time). In other words, the signal delay unit 403 may include means for subtracting a margin time corresponding to the operation time of the actuator from the delay time (Tdelay (= π / ω)). The operating time T11 shown in FIG. 3 is a margin time. In FIG. 3, time T12 is a detection delay time.

  Next, a second embodiment of the vehicle seat belt apparatus according to the present invention will be described with reference to FIGS. FIG. 4 is a view similar to FIG. 1, showing a schematic overall view of the vehicle and the internal configuration of the control device as seen from the side, and FIG. 5 shows a flowchart showing the flow of processing executed by the control device. 4 and 5, elements that are substantially the same as those described in FIGS. 1 and 2 are assigned the same reference numerals, and detailed descriptions thereof are omitted.

  The vehicle seat belt device according to the second embodiment is characterized in that a configuration is provided in which the delay time set by the signal delay unit 403 can be arbitrarily adjusted. In this configuration, means for detecting the mass of the passenger 13 and means for adjusting the delay time of the signal delay unit 403 are provided. The means for detecting the mass of the occupant 13 is, for example, a plurality of load detection units 61 provided at the attachment portion below the seat 12. The load detection unit 61 is a load sensor such as a strain gauge, for example, and a load sensor installed for a smart airbag for frontal collision can be used. The means for adjusting the delay time of the signal delay unit 403 includes a calculation unit 411 and a delay time adjustment unit 412 provided in the control device 40.

  A detection signal output from the load detection unit 61 is provided to the calculation unit 411 via the input unit 410. In principle, the delay time to be set by the signal delay unit 403 is obtained based on the calculation formula described in the first embodiment. However, when the mass of the occupant 13 is different, the backward motion of the occupant 13 at the time of the rear impact changes according to the mass (weight) of the occupant 13. That is, the time to move to the rearmost position differs depending on the mass of the occupant 13. Therefore, the calculation unit 411 obtains the optimum delay time for the occupant 13 based on the information related to the mass of the occupant 13 given from the load detection unit 61. In this case, the correction amount can be obtained by a correction formula, or the mass range can be distinguished in advance and the correction amount or the correction coefficient corresponding to the mass range can be obtained. As described above, the calculation unit 411 only needs to be able to obtain the optimum delay time for the occupant 13 based on the information related to the mass of the occupant 13 given from the load detection unit 61, and the configuration for that purpose achieves the object. It can be arbitrarily designed if possible. Adjustment data for optimally setting the delay time obtained by the calculation unit 411 is supplied to the delay time adjustment unit 412. The delay time adjustment unit 412 sets the delay time set in the signal delay unit 403 based on the adjustment data given from the calculation unit 411 to an optimum delay time for the occupant 13. Other configurations are the same as those described in the first embodiment.

  The content of the above control is shown in the processing flow as shown in FIG. Since the delay time (T1) set by the signal delay unit 403 is determined depending on the mass of the occupant 13 sitting on the seat 12, a delay suitable for the occupant 13 at the initial stage when the occupant 13 is seated on the seat 12 is determined. Processing to set the time is performed. That is, at the initial stage of the processing flow shown in the flowchart of FIG. 5, information related to the mass of the occupant 13 output from the load detection unit 61 is input (step S21), and the calculation unit 411 corrects the correction amount based on the mass information. (Step S22), and a reference delay time (T0) prepared in advance is corrected by the correction amount to calculate an optimum delay time (T01) (step S23). Next, the delay time adjustment unit 412 sets the optimum delay time T01 calculated by the calculation unit 411 to the delay time T1 set in the signal delay unit 403 (step S24). The subsequent control processing flow is the same as that described in the above-described first embodiment, so the above description is used and repeated description is omitted here.

  According to the structure of 2nd Embodiment, in addition to the effect demonstrated in 1st Embodiment, the advantage that a more suitable delay time (T1) can be set with respect to the passenger | crew of various physiques and weights Is demonstrated.

  Next, a third embodiment of the vehicle seat belt apparatus according to the present invention will be described with reference to FIGS. 6 is a view similar to FIG. 4 and the like, showing a schematic overall view of the vehicle as viewed from the side and the internal configuration of the control device, and FIG. 7 is a flowchart showing the flow of processing executed by the control device. . 6 and 7, elements substantially the same as those described in FIG. 4 and FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The vehicle seat belt apparatus according to the third embodiment is further configured so that the vehicle body acceleration detection unit 71, the occupant 13 and the seat back 12b are in contact with each other in the configuration of the vehicle seat belt apparatus according to the second embodiment described above. A contact detection unit 72 to be detected is added. The detection signal output from the vehicle body acceleration detection unit 71 and the detection signal output from the contact detection unit 72 are input to the calculation unit 411 via the input unit 410 together with the detection signal from the load detector 61 described above. The

  When the occupant 13 and the seat back 12b are not in contact with each other and are in a separated position, a suitable delay time (Tdeley) calculated by the formula described in the first embodiment is the initial state, that is, the occupant 13 is in contact. Correction is necessary depending on the time at which the passenger 13 and the relative speed between the vehicle body of the vehicle 11 and the vehicle 11 at this time. In the calculation of the correction amount by the calculation unit 411 according to the present embodiment (step S310), in addition to the correction amount calculation described above, the vehicle body acceleration detected by the vehicle body acceleration detection unit 71 is further detected from the start of the collision. Is integrated with the time until contact between the occupant 13 and the seat back 12b is detected (step S311), and the relative speed between the occupant 13 and the vehicle body is calculated (step S312). In the calculation of the optimum delay time by the calculation unit 411 (step S320), the calculation process for delay time correction described in the second embodiment is performed based on the contact time of the occupant 13 detected by the contact detection unit 72. In addition, the relative speed between the occupant and the vehicle body is reflected (step S321), and correction relating to the delay time (T1) set by the signal delay unit 403 is performed. Therefore, in step S301 for reading output signals from various detection units and the like according to the present embodiment, a signal related to the mass information of the occupant 13 from the load detection unit 61, a signal related to the vehicle acceleration from the vehicle body acceleration detection unit 71, and a contact detection unit. A signal related to contact from 72 is input.

  Next, a fourth embodiment of the vehicle seat belt apparatus according to the present invention will be described with reference to FIGS. This embodiment is a modification of the first embodiment. FIG. 8 is a view similar to FIG. 1 and shows a schematic overall view of the vehicle and the configuration of the control device as seen from the side. FIG. 9 is a flowchart showing the contents of control. In FIG. 8, elements substantially the same as those described in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the vehicle seat belt device according to the fourth embodiment, a rear collision prediction device 81 that detects the possibility of a rear collision of the vehicle 11 is provided in the rear portion 11B of the vehicle 11. As the rear collision prediction device 81, the detection function unit is a radar device, a camera device, or the like. In order to predict the rear collision, a calculation process by the control device 40, that is, a computer is required. When the rear collision prediction device 81 predicts the possibility of a collision with a rear vehicle or the like, a control command signal is generated. The belt tightening device 30 includes a first actuator 321 and a second actuator 322. The first actuator 322 is an explosive device that winds the belt 21 using thrust, and the second actuator 321 is an electric motor that reversibly winds the belt 21. The second actuator 321 includes a clutch mechanism and the like. In the belt tightening control by the second actuator 321, the tightening force is preferably set to a load that does not affect the driving operation.

  In addition, the control device 40 includes a first belt tightening control unit 404A and a second belt tightening control unit 404B. The first belt tightening control unit 404A corresponds to the belt tightening control unit 404 described in the first embodiment. Therefore, the configurations and operations of the input unit 401, the signal delay unit 403, the first belt tightening control unit 404A, and the output unit 402 are the same as those in the case of the first embodiment. In this case, the input signal is a detection signal from the collision detection unit 51, and the control target is the first actuator 321. The second belt tightening control unit 404B is also provided with an input unit 421 and an output unit 422. The second belt tightening control unit 404B receives the prediction detection signal output from the rear collision prediction device 81, drives the second actuator 322 based on the prediction detection signal, and controls belt tightening.

  A control processing flow based on the first belt tightening control 404A and the second belt tightening control unit 404B will be described with reference to FIG. The contents of control by the first belt tightening control 404A are basically the same as those in the first embodiment, and FIG. 9 shows steps S11, S12, S13, S14, and S15 as in FIG. ing.

  According to the belt control at the time of rear collision by the vehicle seat belt device according to the fourth embodiment, the control by the second belt tightening control unit 404B is executed in the initial stage. First, the second actuator 322 is driven by the control operation of the second belt tightening control unit 404B based on the detection signal related to the prediction output from the rear collision prediction device 81, so that the belt 21 is brought into a driving state in a preliminary restrained state. To do. That is, a signal output from the rear collision prediction device 81 is input (step S41). Next, in a determination step S42, it is determined whether or not there is a prediction detection signal in the output signal. If NO, the process returns to step S41, and if YES, the next step S43 is executed. In step S43, the operation of the actuator 322 such as an electric motor is controlled based on the read prediction detection signal to adjust the belt winding amount. In this belt tightening control, it is desirable that the tightening force does not affect the driving operation. Thus, the second belt tightening control unit 404B forms a drive mode in a preliminary restrained state. In the next step S44, in the preliminary restrained state, for example, the set delay time T1 is corrected / adjusted and changed in accordance with the adjusted belt winding amount. In this case, the larger the belt winding amount, the longer the delay time. This substantially reduces the margin time. After that, the control for belt tightening based on the first belt tightening control unit 404A based on the detection of the rear collision by the collision detection unit 51, that is, the above-described steps S11 to S15 are executed. At this time, if NO in the determination step S12, the process returns to the first step S41. Further, as the reference set delay time T1 used in the determination step S14, T1 adjusted in step S44 is used. Based on step S15, the belt 21 is wound by the thrust of the first actuator 321.

  In the fourth embodiment, when a gunpowder device is used for the first actuator 321, the first actuator 321 is provided independently of the second actuator 322. In addition, when using an electric motor for the 1st actuator 321, the change of the output state shall be adjusted and it shall be changed similarly to the case of an explosive device.

  In the above fourth embodiment, as the contents of the control in the control device 40, when the rear collision detection unit 51 detects a rear collision during the operation of the second actuator 322, the output of the second actuator 322 is output. It is also possible to switch to the increased state and control to drive the first actuator 321 after the delay time.

  Further, as a content of control in the control device 40, the configuration in which the delay time is corrected using the winding state detecting means for detecting the belt winding amount when the second actuator 322 is operated has been described. Instead of the means, a belt tension detecting means may be used to provide a correcting means for correcting the delay time based on information relating to the belt tension state.

  The vehicle seat belt device according to the present invention can be arbitrarily configured as necessary by appropriately combining the characteristic configurations of the first to fourth embodiments.

  The configurations, shapes, sizes, and arrangement relationships described in the above embodiments are merely schematically shown to the extent that the present invention can be understood and implemented. Therefore, the present invention is not limited to the described embodiments, and can be variously modified without departing from the scope of the technical idea shown in the claims.

  The vehicle seat belt device according to the present invention is used for optimally fastening a belt in the case of a rear collision in a passenger car or the like and preventing a secondary collision due to rebound.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of a vehicle seat belt device according to the present invention, and is a diagram showing a schematic overall view of a vehicle and an internal configuration of a control device as viewed from the side. It is a flowchart which shows the control content which concerns on 1st Embodiment. It is a time calendar graph for explaining margin time. FIG. 5 is a diagram showing a second embodiment of a vehicle seat belt device according to the present invention, and is a diagram showing a schematic overall view of the vehicle as viewed from the side and an internal configuration of a control device. It is a flowchart which shows the control content which concerns on 2nd Embodiment. It is a figure which shows 3rd Embodiment of the seatbelt apparatus of the vehicle which concerns on this invention, and shows the schematic whole view of the vehicle seen from the side surface, and the internal structure of a control apparatus. It is a flowchart which shows the control content which concerns on 3rd Embodiment. FIG. 8 shows a fourth embodiment of a seat belt device for a vehicle according to the present invention, and is a diagram showing a schematic overall view of the vehicle as viewed from the side and an internal configuration of a control device. It is a flowchart which shows the control content which concerns on 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Vehicle 12 Seat 13 Crew 20 Seat belt device 21 Belt 30 Belt tightening device 31 Belt reel 32 Actuator 40 Control device 51 Collision detection unit 61 Load detection unit 71 Car body acceleration detection unit 72 Contact detection unit 81 Rear collision prediction device 403 Signal delay unit 404 Belt tightening control unit 404A First belt tightening control unit 404B Second belt tightening control unit 412 Delay time adjusting unit

Claims (6)

A belt reel around which a belt is wound, an actuator that winds the belt by rotating the belt reel, a rear collision detection unit that detects a rear collision of the vehicle, and a detection signal from the rear collision detection unit A seat belt device for a vehicle, comprising: control means for controlling the winding operation of the belt by the actuator based on:
The control means includes
Timer means for measuring the time from the time when the rear collision detection means detected the rear collision;
Based on the time measured by the timer means, a signal delayed by a delay time corresponding to a time that is the maximum time for occupant movement in the direction opposite to the acceleration caused by the rear collision and does not depend on the acceleration. Signal delay means for outputting;
A rear collision belt tightening control means for operating the actuator based on the signal output from the signal delay means,
A vehicle seat belt device. Comprising mass detection means for detecting the occupant mass;
2. The vehicle according to claim 1, wherein the control unit includes a delay time adjusting unit that adjusts the delay time set by the signal delay unit based on the occupant mass detected by the mass detection unit. Seat belt device.   3. The vehicle seat belt apparatus according to claim 1, wherein the signal delay means includes means for subtracting a margin time corresponding to the operation time of the actuator from the delay time. The vehicle further comprises rear collision prediction means for detecting the possibility of the rear collision of the vehicle,
The actuator comprises a first actuator that winds the belt using a propellant of explosives, and a second actuator that reversibly winds the belt using a driving force of a motor,
The rear collision belt tightening control means drives the second actuator based on a detection signal output from the rear collision prediction means, and controls the belt in a preliminarily restrained driving mode. And first control means for controlling the operation of the first actuator based on a delay time corresponding to the preliminary restrained state when the rear collision is detected by the rear collision detection means.
The vehicle seat belt device according to any one of claims 1 to 3.   The control means switches to a state in which the output of the second actuator is increased when the rear collision detection means detects the rear collision when the second actuator is operated, and the first actuator is switched after the delay time. 5. The vehicle seat belt device according to claim 4, wherein the vehicle seat belt device is driven.   The said control means is provided with the correction means which correct | amends the said delay time based on the information of the winding state detection means which detects the tension | tensile_strength at the time of an operation | movement of a said 2nd actuator, or winding amount. The vehicle seat belt apparatus according to claim.

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