JP4719627B2 - 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 having a function of authenticating whether or not an occupant is an authorized person.

In recent vehicles, there has been proposed a system for authenticating whether the user of the vehicle is a person who can use the vehicle properly. For example, in the following Patent Document 1, a personal authentication system for a vehicle user is disclosed. This personal authentication system is a system that authenticates whether or not a user who uses these communication systems is a legitimate person using various communication systems mounted on a vehicle. According to this personal authentication system, it is a system configuration using an IC card, and it is possible to transmit IC card information recorded on the IC card and authentication information via a plurality of different communication means, Ensures safety.
JP 2002-232342 A

  In the above identity authentication system, since the identity is confirmed using an IC card, even if the IC card itself is used by someone other than the identity of the person, the identity cannot be authenticated and unauthorized use cannot be prevented. .

  In view of the above problems, an object of the present invention is to provide a vehicle seat belt device capable of realizing a personal authentication system that reliably authenticates whether or not an occupant who has boarded a vehicle is a person using the seat belt mounting characteristics. It is to provide.

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

  The vehicle seat belt apparatus according to the present invention includes a belt reel around which a belt is wound, and further includes a belt withdrawal amount detection means for detecting a belt withdrawal amount from the rotation of the belt reel, and the belt withdrawal amount detection means outputs the belt reel amount detection means. And occupant authentication means for authenticating the occupant based on the time change characteristic of the detection signal.

  In the above-mentioned seat belt device, when the occupant sitting on the seat wears the seat belt, the seat belt uses the amount of withdrawal according to the occupant's body shape, individual operation characteristics, etc. Therefore, the occupant can be authenticated using this.

  The vehicle seat belt device of the present invention further includes first timer means for measuring a time when the withdrawal amount reaches a predetermined value by a detection signal output from the belt withdrawal amount detection means. It is possible to contribute to occupant authentication by using the timing information of the timer means.

  The vehicle seat belt device according to the present invention further includes a calculating means for calculating at least one of a belt drawing amount, a drawing speed, and a drawing acceleration after a predetermined time has elapsed since the detection of the belt drawing. Comparing means for comparing the value calculated by the means with a reference value.

  The vehicle seat belt apparatus according to the present invention further includes second timer means for measuring a time from when the belt withdrawal is detected until the withdrawal speed is maximized.

  The vehicle seat belt device of the present invention further includes seat position detection means for detecting front and rear positions of the seat, and the occupant authentication detection means changes the authentication condition based on the detection signal from the detection means of the seat detection means. Configured as follows.

  In the vehicle seat belt device according to the present invention, the occupant authentication unit includes a comparison unit that compares a change over time of the detection signal of the drawer amount detection unit with a reference waveform, and authenticates the occupant based on the comparison result. Composed.

  According to the present invention, since the characteristics of changes such as the amount of withdrawal of the belt, the withdrawal speed, the withdrawal acceleration, and the like that are generated when the occupant wears the seat belt in the seat belt device of the vehicle are inherently different for each occupant, Can be used as an occupant characteristic signal to accurately identify the occupant. This can prevent unauthorized use of the vehicle by anyone other than the authorized person.

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

  FIG. 1 shows an installed state of a seat belt device in a driver's seat, FIG. 2 shows a configuration of a retractor for a seat belt, and FIG. 3 shows an overall configuration of a control system for a seat belt device of a vehicle.

  In FIG. 1, a seat belt device 10 includes a belt (webbing) 13 that restrains the body of an occupant 11 to a seat 12. The belt 13 includes a belt portion 13 a that restrains the upper body of the occupant 11 and a belt portion 13 b that restrains the waist of the occupant 11. One end of the belt portion 13b is fixed to the vehicle body portion at the lower part of the passenger compartment by an anchor plate 14. The belt portion 13 a is folded back by a through anchor 15 provided near a shoulder of the occupant 11, and an end portion thereof is connected to a belt reel of the retractor 16. A tongue plate 17 is attached to the other common end of the belt 13. The tongue plate 17 is detachably attached to a buckle 18 fixed to the lower edge of the seat 12. The buckle 18 is provided with a buckle switch 19 that detects the connection of the tongue plate 17. When the buckle switch 19 is turned on, the tongue plate 17 is connected and locked to the buckle 18, and it is determined that the belt 13 is attached to the occupant 11.

  The seat 12 has a structure that can move in the front-rear direction (left-right direction in FIG. 1) in the vehicle compartment and can be fixed at any position within the allowable movement range. In the seat front-rear direction moving mechanism, a seat position detection unit 12a that detects the position of the seat 12 is attached.

  FIG. 2 shows a main configuration of the seat belt retractor 16. The retractor 16 includes a belt reel (spindle) 22 that is rotatably provided in the housing 21 and a motor 23 that rotationally drives the belt reel 22. The belt reel 22 is coupled to the end of the belt portion 13a of the belt 13, and the belt portion 13a is wound around the belt reel 22 and wound. The shaft 22 a of the belt reel 22 is connected to the drive shaft 23 a of the motor 23 via a power transmission mechanism (gear mechanism) 24. The belt reel 22 is rotationally driven by a motor 23 via a power transmission mechanism 24. The retractor 16 includes a rotation detection unit 25 connected to the shaft 22 a of the belt reel 22.

  The rotation detection unit 25 is preferably configured using a rotation angle sensor. For example, a magnetic sensor formed by combining a magnetic disk and two Hall ICs is used as the rotation angle sensor. The minimum resolution angle of the rotation angle sensor is, for example, 4 °, and is about 1.3 to 1.6 mm when converted into the belt length.

  The rotation detector 25 outputs two-phase pulse signals (P1, P2) that are shifted in phase by a predetermined amount based on the structure and action of the magnetic sensor. The two pulse signals can detect the rotation direction (winding direction or drawing direction) of the shaft 22a of the belt reel 22 based on the phase relationship in which the pulses are generated. Furthermore, the rotation angle (rotation amount) generated by the rotation operation of the shaft 22a of the belt reel 22 can be detected by counting the number of generated pulses using one of the two pulse signals. This rotation angle becomes a winding amount or a drawing amount according to the rotation direction.

  The two pulse signals P1 and P2 output from the rotation detector 25 are input to the control device 26 as shown in FIG. The control device 26 can obtain the belt winding position, the winding amount, the drawing amount, etc. by the belt reel 22 using the two pulse signals P1, P2.

  In the seat belt device 10 according to the present embodiment, the rotation detection unit 25 is used as a basic element of the belt withdrawal amount detection means for obtaining the belt withdrawal amount.

  Further, the detection signal from the buckle switch 19 and the detection signal from the seat position detection unit 12a are input to the control device 26.

  The control device 26 has functional means such as a rotation angle detection means and a rotation angle change detection means. The signal related to the rotation angle change obtained from the rotation angle change detection means is used as information for detecting the movement of the belt 13 when the seat belt is worn or the change in the belt withdrawal amount by the belt reel 22, for example. Further, the belt winding position by the belt reel 22 can be obtained based on the signal relating to the rotation angle change obtained from the rotation angle change detecting means. Usually, the belt winding operation of the retractor 16 is controlled by the control device 26 based on the detection information of the belt winding position.

  The control device 26 controls the belt winding operation of the retractor 16 by controlling the energization amount of the drive current I1 supplied from the power source 27 to the motor 23 by the energization amount adjustment unit 28. The retractor 16 controlled by the control device 26 is configured as an electric pretensioner for maintaining the position and posture of the occupant 11.

  The seat belt device 10 and the retractor 16 included therein are devices on the driver's seat side, but the same seat belt device and retractor are also provided on the passenger seat side. In the following, the “R side” is the driver seat side, and the “L side” is the passenger seat side.

  With reference to the block diagram of FIG. 3, the control system of the seat belt device 10 and the like will be described from the viewpoint of hardware.

  In FIG. 3, the control device 26 described above is composed of a CPU. A block 30 including the control device 26 represents an electric pretensioner unit for holding the position / posture of the occupant 11 by a seat belt. The block 30 includes a power source 31, an in-vehicle network (CAN) communication unit 32, a rotation angle interface (rotation angle I / F) unit 33, and a communication unit 34 on the input side of the control device (CPU) 26, and on the output side thereof. An R-side motor drive control unit 35, an L-side motor drive control unit 36, and a recording unit 37 are provided. The recording unit 37 is a memory.

  Further, on the input side of the block 30, a block showing the above retractor 16 is provided as an example of a seat belt retractor. The retractor 16 includes a rotation angle interface (rotation angle I / F) unit 41 for transmitting the detection signal output from the rotation detection unit 25 described above to the control device 26. The rotation angle interface unit 41 is connected to the rotation angle interface unit 33 in the block 30 and sends a detection signal to the rotation angle interface unit 33. The retractor 16 is provided for each of the driver's seat side and the passenger seat side.

  The input side of the block 30 further includes an ACC (Adaptive Cruise Control) unit (control unit such as an obstacle detection device) 42, a VSA (Vehicle Stability Assist) unit (vehicle behavior stabilization control unit) 43, FI / AT ( A Fuel Injection / Automatic Transmission (44) unit, an SRS (Supplement Restraint System) unit (auxiliary restraint device unit) 45, and the like are provided. These input-side elements include the above-described seat position detection unit 12a, a vehicle running state detection unit such as a vehicle speed sensor, and the like.

  The ACC unit 42, the VSA unit 43, the FI / AT unit 44, and the like supply their output signals to the in-vehicle network communication unit 32 through the in-vehicle network 46. The SRS unit 45 includes an SRS control unit 45a that receives signals from the R-side buckle 47R and the L-side buckle 47L, and a communication unit 45b. Here, the R-side buckle 47R corresponds to the buckle 17 on the driver's seat side, and the L-side buckle 47L is a buckle of a seat belt device equipped on the passenger seat side. Each signal output from the R side buckle 47R and the L side buckle 47L is a detection signal output from the built-in buckle switch 19. When receiving a signal from the R side buckle 47R or the L side buckle 47L, the SRS control unit 45a transmits the signal to the communication unit 32 of the block 30 via the communication unit 45b. Further, the SRS unit 45 supplies a warning signal to a warning lamp 48 or a warning device (not shown) when the seat belt is not normally used during traveling of the vehicle.

  An R-side motor 51 and an L-side motor 52 are provided on the output side of the block 30. The R-side motor 51 is a driving motor for the seat belt device 10 on the driver's seat side, and is disposed corresponding to the R-side motor drive control unit 35. The R-side motor drive control unit 35 controls the energization amount from the power source (+ V) 27 based on a control command signal from the control device 26 and supplies a drive current to the R-side motor 51. The block 53 is a grounding part. The L-side motor 52 is a driving motor for the seat belt device 10 in the passenger seat, and is disposed corresponding to the L-side motor drive control unit 36. The L-side motor drive control unit 36 controls the energization amount from the power source (+ V) 54 based on a control command signal from the control device 26 and supplies a drive current to the L-side motor 52. The block 55 is a grounding part. The grounding portions 53 and 55 are grounding terminals that form part of the vehicle body.

  Further, the control device 26 is provided with a timer (timekeeping) signal generator 56.

  FIG. 4 shows a basic conceptual configuration of the control system of the seat belt device 10 according to the present embodiment. The configuration in the control device 26 is functional means realized by a program executed by the CPU.

  In FIG. 4, the rotation detection unit 25 and the seat position detection unit 12a are sensor elements as described above. The control device 26 includes a rotation direction detection unit 61 and a rotation angle detection unit 62. The rotation direction detection unit 61 determines the rotation direction based on the change direction of the pulse waveform based on the two pulse signals P1 and P2 provided by the rotation detection unit 25 with the phase shifted by a predetermined amount, and the normal rotation direction ( A signal indicating whether the direction is the winding direction or the reverse direction (drawing direction) is output. Similarly, the rotation angle detection unit 62 detects the rotation angle (rotation amount) by counting the number of pulses using at least one of the two pulse signals P1 and P2 provided from the rotation detection unit 25. A signal related to the rotation angle is output.

  The detection signal output from the rotation direction detection unit 61 and the detection signal output from the rotation angle detection unit 62 are input to the extraction amount (displacement) calculation unit 63. The drawing amount calculation unit 63 calculates the drawing amount based on the detection signal of the rotation angle detection unit 62 on the assumption that a detection signal indicating that the rotation direction is the reverse direction (drawing direction) is input from the rotation direction detection unit 61. In the withdrawal amount calculation unit 63, the calculation time is set by the time setting unit 64. Based on the detection signal output from the rotation direction detector 61, the time setting unit 64 sets the calculation time for calculating the subsequent extraction amount after detecting the extraction operation. Accordingly, the drawer amount calculation unit 63 calculates the drawer amount (drawer displacement amount) for a predetermined time set by the time setting unit 64. A signal related to the withdrawal amount output from the withdrawal amount calculation unit 63 can be grasped as a change characteristic of the withdrawal amount during a predetermined time.

  A signal related to the withdrawal amount output from the withdrawal amount calculation unit 63 is input to the subsequent extraction speed calculation unit 65, the first timer 67, and the comparison unit (authentication unit) 71 of the occupant authentication unit 70.

  The drawing speed calculation unit 65 calculates the drawing speed by executing a differential calculation process or the like on the signal related to the drawing amount output from the drawing amount calculation unit 63. The drawing speed calculation unit 65 outputs a signal related to the drawing speed. A signal related to the drawing speed output from the drawing speed calculation unit 65 is grasped as a change characteristic of the drawing speed during the predetermined time. A signal related to the drawing speed output from the drawing speed calculation unit 65 is input to a subsequent drawing acceleration calculation unit 66, a second timer 68, and a comparison unit (authentication unit) 71 of the occupant authentication unit 70.

  The drawer acceleration calculation unit 66 calculates the pull-out acceleration by executing a differential calculation process or the like on the signal related to the drawing speed output from the drawing speed calculation unit 65. The drawing acceleration calculation unit 66 outputs a signal related to the drawing acceleration. A signal related to the pulling acceleration output from the pulling acceleration calculation unit 66 is grasped as a change characteristic of the pulling acceleration during the predetermined time. An output signal related to the pulling acceleration from the pulling acceleration calculation unit 66 is input to the comparison unit 71 of the occupant authentication unit 70.

  In addition, the first timer 67 is a timer that measures the elapsed time when the withdrawal amount reaches a preset value with respect to the withdrawal amount signal output from the withdrawal amount calculation unit 63. The preset value and its matching comparison function are provided as an accompanying function in the first timer 67. The time information output from the first timer 67 is used for occupant authentication.

  The second timer 68 is a timer that measures an elapsed time until the drawing speed reaches a maximum value with respect to a signal related to the drawing speed output from the drawing speed calculation unit 65. A function for determining whether or not the withdrawal speed has reached the maximum value is provided in the second timer 68 as an accompanying function. The time information output from the second timer 68 is used for occupant authentication.

  The two pulse signals P 1 and P 2 output from the rotation detection unit 25 are input to the waveform pattern detection unit 81. The waveform pattern detector 81 extracts and detects characteristic waveform patterns of the two input pulse signals P1 and P2. Characteristic waveform pattern data of the two pulse signals detected by the waveform pattern detection unit 81 is input to the comparison unit (authentication unit) 71 of the passenger authentication unit 70 described above.

  Next, the occupant authentication unit 70 will be described. The occupant authentication unit 70 is a portion indicated by a broken line block. The occupant authentication unit 70 includes a comparison unit (authentication unit) 71 and a reference value setting unit (authentication condition setting unit) 72. The reference value setting unit 72 prepares and registers authentication conditions in advance, and stores the authentication conditions as reference values. The comparison unit 71 compares the input occupant feature signal (or data) with the reference value (authentication condition) stored in the reference value setting unit 72 corresponding to the occupant feature signal, and the two match. A process of outputting a passenger authentication signal is performed.

  As described above, the occupant characteristic signal (or data) includes a signal related to the amount of drawer from the drawer amount calculator 63, a signal related to the drawer speed from the drawer speed calculator 65, and a drawer acceleration from the drawer acceleration calculator 66. And the waveform pattern data from the waveform pattern detection unit 81. Therefore, the reference value setting unit 72 prepares a reference value as an authentication condition individually for each of the signal related to the amount of extraction, the signal related to the extraction speed, the signal related to the extraction acceleration, and the waveform pattern data. Has been.

  In the configuration shown in FIG. 4, as the occupant characteristic signal (or data), for example, a signal related to the amount of pull-out, a signal related to the pull-out speed, a signal related to pull-out acceleration, and four signals of waveform pattern data are used. However, the present invention is not limited to this, and any one of these four signals and the like or any combination thereof can determine an occupant characteristic signal to be used for occupant authentication.

  As shown in FIG. 4, a detection signal from the seat position detection unit 12 a is input to the reference value setting unit 72. This configuration is a configuration for changing the reference value set in the reference value setting unit 72, that is, the authentication condition, based on the detection signal from the seat position detection unit 12a. For this purpose, in the reference value setting unit 72, reference values corresponding to the respective positions are prepared in a table format according to the position of the seat 12 in the front-rear direction, and the reference value corresponding to the seat position is used.

  Next, an occupant authentication operation performed by the occupant authentication unit 70 will be described. In this operation description, the flowchart shown in FIG. 5 and various occupant characteristic signals shown in FIGS. 6 and 7 are further referred to.

  FIG. 6 shows, as an example, an occupant characteristic signal at the time of a belt pull-out operation for three occupants. (A), (B), and (C) of FIG. 6 respectively show the change characteristics of the pull-out amount (displacement) (a), the change characteristics of the pull-out speed (b), and the pull-out acceleration (c) for the passengers A, B, and C. ) Shows the change characteristics. As shown in the figure, the occupants A, B, and C have different characteristics of change in the amount of withdrawal (displacement), characteristics of change in the withdrawal speed, and characteristics of change in the withdrawal acceleration. Therefore, if these change characteristics are used as the occupant characteristic signal, each of the occupants A, B, and C can be identified and authenticated as to who is sitting on the seat 12 and wearing the seat belt.

  FIG. 7 shows, as an example, an occupant characteristic signal related to waveform pattern data at the time of a belt extraction operation for three occupants. In FIG. 7, (A), (B), and (C) in the vertical direction indicate the waveform pattern data by the pulse signal P1 and the waveform pattern data by the pulse signal P2 for the passengers A, B, and C, respectively. a) and (b) show the first waveform pattern data and the second waveform pattern data (for example, after 10 minutes). As shown in the figure, each of the passengers A, B, and C has unique waveform pattern data, and the waveform pattern data is different. Therefore, if this waveform pattern data is used as an occupant characteristic signal, each of the occupants A, B, and C can be identified and authenticated as to who is sitting on the seat 12 and wearing the seat belt.

  The occupant authentication processing flow shown in FIG. 5 is executed by using the signals or data of the drawing amount, the drawing speed, the drawing acceleration, and the waveform pattern shown in FIGS. In this processing flow, it is assumed that the occupant 11 is the occupant A and the occupant A is a legitimate person. The device configuration for executing the occupant authentication process shown in the flowchart of FIG. 5 is as shown in the block diagram of FIG.

  According to FIG. 5, it is determined in the first step S11 whether or not the belt 13 has been pulled out. The drawing operation of the belt 13 is determined based on the detection signal of the rotation detection unit 25 attached to the belt reel 22 to determine whether the rotation operation of the belt reel 22 is rotation in the drawing direction. If NO in determination step S11, the process flow ends. If YES in the determination step S11, it is next determined whether or not the change characteristic of the withdrawal amount of the belt 13 matches the registered reference value (step S12). In this case, the degree of coincidence does not need to be a complete coincidence, and is determined based on, for example, whether or not the degree of coincidence is about 80%.

  If YES in the determination step S12, the process proceeds to the next determination step S13, and if NO, a process for issuing an alarm is performed. As for the alarm, for example, it is preferable to issue a light alarm in the case of the first passenger authentication process and to issue a strong alarm in the case of the second passenger authentication process.

  In the determination step S13, in the pull-out operation of the belt 13, when the change characteristic of the pull-out amount coincides with the registered one, the change characteristic of the pull-out speed and the change characteristic of the pull-out acceleration are respectively registered with the registered reference value. It is determined whether or not they match. In this case, the degree of coincidence does not have to be complete coincidence, and is determined based on, for example, whether or not the degree of coincidence is about 80%.

  If YES in the determination step S13, the process proceeds to the next determination step S14, and if NO, a process for issuing an alarm similar to the above is performed. That is, a light warning is issued in the case of the first passenger authentication process, and a strong warning is issued in the case of the second passenger authentication process.

  In the next determination step S14, it is determined whether or not the waveform pattern data coincides with the registered reference value (waveform pattern data) in the drawing operation of the belt 13. In this case, the degree of coincidence does not have to be complete coincidence, and is determined based on, for example, whether or not the degree of coincidence is about 80%.

  If YES in the determination step S14, the process proceeds to the next processing step S15, and if NO, a process for issuing an alarm similar to the above is performed.

  In the processing step 15, a personal authentication process is performed, and as a result, an authentication signal is output that the occupant 11 sitting on the seat 12 and wearing the belt 13 is the person (occupant A).

  As described above, when the occupant 11 is seated on the seat 12 and wears the belt 13 in the sieve belt device 10, various change characteristics in the belt pull-out operation at the time of wearing differ significantly from person to person. If the change characteristic of the person is registered, it is possible to accurately authenticate whether or not the passenger is an authorized person.

  By calculating and measuring the change characteristic of the withdrawal amount at predetermined time intervals, it is possible to eliminate the influence of variations in the resolution of the detection capability.

  By changing the reference value (authentication condition) registered in the reference value setting unit 72 in accordance with the changed seat position, it is possible to accurately authenticate the person regardless of whether or not the seat position is changed.

  Next, a modification of the embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 shows a signal change characteristic 81 relating to the belt withdrawal amount as an occupant characteristic signal used for authenticating the person from the time when a certain belt withdrawal amount is reached to a certain reference amount thereafter. An example of measuring the time at and using this measurement time is shown.

  FIG. 9 shows the time (t1, t2) at which the peak value of speed or acceleration is reached in the change characteristic 82 of the signal related to the belt pull-out speed or pull-out acceleration as an occupant characteristic signal used when authenticating the person. An example in which this peak value arrival time is used will be described.

  FIG. 10 shows an example of using the value of the belt withdrawal amount at a predetermined time in the signal change characteristic 83 related to the belt withdrawal amount as the occupant characteristic signal used when authenticating the person. Similarly, with respect to the change characteristic of the signal related to the belt pull-out speed and the change characteristic of the signal related to the belt pull-out acceleration, similarly, the value of the belt pull-out speed at the predetermined time point or the value of the belt pull-out acceleration at the predetermined time point is similarly calculated. It can be used as an occupant characteristic signal.

  FIG. 11 shows an example in which, as an occupant characteristic signal used when authenticating an individual, for example, a change characteristic 86 of an error integral value is used in relation to a change characteristic 85 in a change characteristic 84 of a signal related to a belt withdrawal amount. Indicates. Similarly, the error integrated value can be used as the occupant characteristic signal for the change characteristic of the signal related to the belt drawing speed or the change characteristic of the signal related to the belt drawing acceleration.

  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.

  INDUSTRIAL APPLICABILITY The present invention is used for identity authentication for authenticating whether or not an occupant wearing a seat belt is an authorized person in a vehicle seat belt device.

It is a side view which shows the mounting state of the seatbelt apparatus in a vehicle. It is a figure which shows the principal part structure of the retractor of the seatbelt apparatus which concerns on embodiment of this invention. 1 is a block diagram illustrating an overall configuration of a control system for a seat belt device according to the present embodiment. It is a block diagram which shows the basic composition of the principal part of the control system of the seatbelt apparatus which concerns on this embodiment. It is a flowchart which shows the control operation | movement of the seatbelt apparatus which concerns on this embodiment. It is a wave form diagram which shows the example of each change characteristic of the amount of drawers at the time of belt drawing-out operation, drawing-out speed, and drawing-out acceleration. It is a wave form diagram which shows the waveform pattern of two pulse signals output from the rotation detection part at the time of belt drawing-out operation | movement. It is a wave form diagram which shows the other example which can be used as a passenger | crew characteristic signal which authenticates the person. It is a wave form diagram which shows the other example which can be used as a passenger | crew characteristic signal which authenticates the person. It is a wave form diagram which shows the other example which can be used as a passenger | crew characteristic signal which authenticates the person. It is a wave form diagram which shows the other example which can be used as a passenger | crew characteristic signal which authenticates the person.

Explanation of symbols

10 Seat belt device 11 Crew 12 Seat
12a Seat position detector 13 Belt 16 Retractor
22 Belt reel 23 Motor 25 Rotation detection unit 26 Control device (CPU)
61 Rotation direction detection unit 62 Rotation angle detection unit 63 Draw amount calculation unit 65 Draw speed calculation unit 66 Draw acceleration calculation unit 70 Crew authentication unit 71 Comparison unit 72 Reference value setting unit 81 Waveform pattern detection unit

Claims (4)

In a vehicle seat belt apparatus including a belt reel around which a belt is wound,
A belt withdrawal amount detecting means for detecting a belt withdrawal amount from rotation of the belt reel;
A first time variation characteristic of the belt withdrawal amount after the belt withdrawal is detected by a detection signal output from the belt withdrawal amount detection means, and a belt withdrawal speed based on the first time variation characteristic. Calculating means for calculating a second time change characteristic and a third time change characteristic of the belt pull-out acceleration based on the second time change characteristic;
Occupant authentication means for authenticating an occupant based on the first time change characteristic, the second time change characteristic and the third time change characteristic calculated by the calculation means ;
Seat position detecting means for detecting the front and rear position of the seat;
Equipped with a,
The occupant authentication means
A comparing means for comparing the first time change characteristic, the second time change characteristic, and the third time change characteristic with a first reference value, a second reference value, and a third reference value, respectively;
A reference value setting unit that sets the first reference value, the second reference value, and the third reference value according to the front-rear position;
Seat belt device for a vehicle according to claim Rukoto to have a. Seat belt device for a vehicle according to claim 1, wherein the pre-Symbol withdrawn amount, characterized in that the Ru further comprising a first timer means for measuring time has reached a predetermined value. Seat belt device for a vehicle according to claim 1 or 2, wherein before Symbol withdrawal speed is further comprising a second timer means for measuring the time until a maximum. The occupant authentication means further authenticates the occupant based on the change over time of the detection signal of the withdrawal amount detection means ,
The comparison means compares the change with time with a reference waveform ,
It said reference value setting unit, said seat belt device for a vehicle according to any one of claims 1-3, characterized in that for setting the reference waveform in accordance with the longitudinal position.

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