JP4881788B2 - 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 reducing interruption of belt storage operation during belt storage control.

  With regard to seat belt devices equipped to protect passengers sitting in vehicle seats, in recent years, by restraining passengers with belts or webbing in an emergency or when running conditions are unstable (behavior abnormal), A technology for suppressing changes in the sitting posture of the occupant has been put into practical use.

  As a prior art disclosing a seat belt device, there is a webbing take-up device described in Patent Document 1 below. In the webbing take-up device, when the webbing is taken up after the webbing is released, in addition to the biasing force in the take-up direction by the elastic body, the take-up force by the electric motor is applied to the webbing take-up shaft via the clutch. As a result, the webbing is completely wound and set at the complete storage position. According to such a webbing take-up device, when the webbing is taken up, there is a case where the locked state is generated by the operation of the motor for taking up due to some catching cause and the webbing cannot be completely wound.

In view of this, the webbing take-up device described in Patent Document 1 proposes a concept that can complete the webbing even when the motor is locked during the webbing take-up state. According to this webbing take-up device, as a solving means, a lock state detecting means for detecting the locked state of the motor, and a motor that is turned on after the motor is turned off when the locked state of the motor is detected by the lock state detecting means Drive control means is provided. With this configuration, when the motor is locked, the cause of the motor lock is eliminated by turning the motor off and on.
No. 3-23403

  According to the webbing take-up device described in Patent Document 1, the locked state of the motor can be canceled only when the cause of the motor lock can be eliminated by the off / on operation of the motor. Therefore, when winding the webbing to release the webbing, if the motor is locked, the locked state cannot always be canceled.

  In addition, when the belt (webbing) released from the mounted state is wound up to the storage position (total amount storage position) based on the storage control function, the hooking state occurs for various reasons during the winding operation, and the storage operation May be inhibited. Therefore, when the storing operation is obstructed during the storing operation of the belt, it is desired to eliminate this, reduce the interruption of the storing, and ensure that the entire amount can be stored by smooth and reliable storing.

  In view of the above problems, the object of the present invention is to reduce the interruption of the belt storing operation based on the catch determination when the belt storing control is performed using the electric pretensioner when the seat belt is released. An object of the present invention is to provide a seat belt device for a vehicle in which smooth and reliable storage is realized even when storage is hindered and the entire amount of the belt can be stored securely.

  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) includes: a belt reel that winds the belt; a pretensioner mechanism that uses the driving force of the motor to rotate the belt reel and pulls in the belt; Control means for controlling the energization amount and rotation detection means for detecting the rotational operation state of the belt reel are provided, and the control means has a storage control function for storing the belt using a pretensioner mechanism. In the vehicle seat belt device, the control means further determines whether the belt is in the hooked state and information related to the rotational operation state detected by the rotation detecting means when the belt is in the retracting operation state. And a detection condition set by the hook detection means according to the belt winding position information obtained by the rotation detection means and the hook detection means for detecting the belt hooking state. Determination condition adjusting means for changing.

  In the above-described vehicle seat belt apparatus, conditions for determining the belt hooking state during the storing operation according to the winding position of the belt detected by the rotation detecting means during the belt storing operation based on the storage control. Is set. This eases the judgment conditions at the belt winding position where the hooking state is likely to occur, tightens the judgment conditions at the belt winding position where the hooking state is difficult to occur, and reduces the interruption of the belt storage operation based on the storage control. The entire amount can be stored.

In the seat belt device of the first vehicle (corresponding to claim 1 ), the hook detection means further has a predetermined time required for a predetermined change amount of the belt winding position obtained by the rotation detection means under the determination condition. When it exceeds the reference value, it is detected that it is in the hooked state, and the judgment condition adjusting means sets the reference value so that the value becomes smaller as the winding position is closer to the belt complete storage position (origin position). It is characterized by. As a result, the judgment condition is relaxed at the belt winding position far from the origin position where the hooking state is likely to occur, and the judgment condition is stricter at the belt winding position near the origin position where the hooking state is difficult to occur. Reduce interruptions in belt storage.

In the second vehicle seat belt apparatus (corresponding to claim 2 ), in the above configuration, preferably, the determination condition adjusting means sets the reference value relative to the reference position when the winding position is included in a range in which the catching state is likely to occur. If the value is not included in the range, the reference value is set to a relatively small value.

In the third vehicle seat belt apparatus (corresponding to claim 3 ), in the above configuration, the predetermined reference value is preferably a value corresponding to a pulse change interval of a pulse signal output from the rotation detecting means. It is characterized by that.

In a fourth vehicle seat belt apparatus (corresponding to claim 4 ), in the above configuration, preferably, the belt storing operation based on the storage control function of the control means is performed when the belt is not attached. To do.

In the fifth vehicle seat belt apparatus (corresponding to claim 5 ), in the above configuration, preferably, the belt storing operation based on the storing control function of the control means is executed in relation to the slack eliminating control. Features.

A seat belt device for a sixth vehicle (corresponding to claim 6 ) includes: a belt reel that winds the belt; a pretensioner mechanism that uses the driving force of the motor to rotate the belt reel and pulls in the belt; A rotation position detection means for detecting the rotation position; and a control means for controlling the drive of the motor based on the rotation position detected by the rotation position detection means. The control means drives the motor by driving the motor when the belt is released. A device that performs winding control for storing in the storage position, and the control means determines whether or not the rotation position detected by the rotation position detection means and the belt are in the hooked state when the belt is in the storage operation state . based on the determination condition for determining the catching detection means for detecting a hook state of the belt, when the jamming detecting means detects the caught state of the belt, winding And resuming means for performing control again, according to the rotational position the rotational position detecting means for detecting, configured with a resumption of times changing means for changing the restart number of winding control set by resuming means.

In the seat belt device of the sixth vehicle (corresponding to claim 6 ), the hook detection means further has a time required for a predetermined change amount of the rotation position of the belt reel obtained by the rotation position detection means under the determination condition. When a predetermined reference value is exceeded, it is detected that it is in a hooked state, and the number of restarts is such that the rotational position is many times near the belt mounting position and the rotational position is few times near the belt storage position. It is characterized by setting.

According to the present invention, in a configuration in which the belt is retracted using the electric pretensioner mechanism portion when the seat belt is not worn, etc., depending on the retracting position of the belt in the retractor during the belt retracting operation. In order to reduce the interruption of the storing operation, especially when the belt is far from the origin position, the entire amount of the belt is securely stored at the origin position. Can do.
Further, according to the present invention, when the belt retracting control is performed when the seat belt is released, when the belt catching state is detected, the winding control is performed again and the winding control is performed according to the belt winding position. Since the number of restarts of the belt is changed, the suspension of the belt storage operation based on the catch judgment is reduced, smooth and reliable storage is realized even when the storage is obstructed, and the entire amount of belt is securely stored can do.

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

  FIG. 1 shows a state where the seat belt device is installed in a driver's seat, etc., FIG. 2 shows a main part configuration of a seat belt retractor, FIGS. 3 to 5 show a configuration related to a rotation detection unit, and FIG. 1 shows an overall configuration of a control system for a seat belt apparatus.

  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 (folded portion) 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.

  FIG. 2 schematically 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 an electric motor 23 that rotationally drives the belt reel 22. The belt reel 22 is coupled to the end of the belt portion 13 a of the belt 13, and the belt portion 13 a is wound around the belt reel 22. 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.

  A configuration using a rotation angle sensor as an example of the rotation detection unit 25 will be described with reference to FIGS.

  A magnetic sensor is used as the rotation angle sensor. In this magnetic sensor, the disk-shaped magnetic disk 101 has a central portion connected to the shaft 22a of the belt reel 22 and rotates in conjunction with the rotation operation of the shaft 22a of the belt reel 22. A magnetic pole array portion 102 in which minute N-pole regions 102 a and S-pole regions 102 b are alternately arranged is formed in an annular region along the circumferential edge of the magnetic disk 101. The annular magnetic pole array 102 in the magnetic disk 101 is usually made by a magnetization action. The sizes of the N-pole region and the S-pole region in the magnetic pole array unit 102 are set to the extent necessary for realizing the predetermined minimum resolution angle as described above. Corresponding to the magnetic pole array portion 102 of the magnetic disk 101, two Hall ICs 103 and 104 that are magnetically sensitive to the N-pole region 102a and the S-pole region 102b of the magnetic pole array portion 102 are disposed at appropriate positions. The The two Hall ICs 103 and 104 arranged close to the magnetic disk 101 are phased based on the positional relationship between the Hall ICs and the relationship between the magnetic poles of the magnetic pole array portion 102 of the magnetic disk 101 that is sensitive to each other. Output two different pulse signals P1 and P2 that are shifted by a predetermined amount. The two pulse signals P1 and P2 can detect the rotational direction (winding direction or pulling direction) of the shaft 22a of the belt reel 22 based on the phase relationship between the pulses. In other words, the two pulse signals P <b> 1 and P <b> 2 have a characteristic that the front-rear relationship is reversed according to the rotation direction of the shaft 22 a of the belt reel 22. Further, the rotation angle (rotation position, rotation amount) generated by the rotation operation of the shaft 22a of the belt reel 22 is detected by counting the number of generated pulses using one of the two pulse signals P1 and P2. Is possible.

  The two pulse signals P1 and P2 output from the rotation detection unit 25 are input to the control device 26 as shown in FIG. As shown in FIG. 5, the control device 26 has a functional unit that performs necessary signal processing described below using two pulse signals P <b> 1 and P <b> 2 supplied from the rotation detection unit 25.

  In FIG. 5, reference numeral 110 denotes a rotation state detection unit that detects the rotation state (or rotation operation state) of the belt reel 22 based on two pulse signals P1 and P2. Here, the “rotation state (or rotation operation state)” is a concept including the above rotation direction and rotation angle (rotation position, rotation amount), and further, the belt winding position and belt winding position of the belt reel 22. It is a concept that includes changes.

  The rotational state detector 110 is a functional part that detects and processes the rotational state of the shaft 22 of the belt reel 22 around which the belt 13 is wound. The rotation state detection unit 110 includes a rotation direction detection unit 111 and a rotation angle detection unit 112, but is not limited thereto. Further, a rotation angle change detection 113 is provided at the next stage of the rotation state detection unit 110. The rotation angle change detection unit 113 inputs a rotation angle detection signal output from the rotation angle detection unit 112 included in the rotation state detection unit 110, detects a change state of the rotation angle detection signal, and a signal related to the rotation angle change. Is output. The signal related to the rotation angle change output from the rotation angle change detection unit 113 is used as information for detecting the belt winding position by the belt reel 22. 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 and the like 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 mechanism unit for maintaining the posture of the occupant 11.

  As described above, the two detection signals (pulse signals) P1 and P2 with different phases output from the rotation detection unit 25 are input to the control device 26, and finally the data such as the winding position is obtained using these detection information. In order to take out the above, the required arithmetic processing is executed in the control device 26.

  The operation of the retractor 16 is controlled by various control functions of the control device 26. The control device 26 controls the operation of the retractor 16 such as pulling in or feeding out the belt by controlling the energization amount of the drive current I1 supplied from the power source 27 to the motor 23 by the energization amount adjusting unit 28.

  The occupant 11 who gets on the seat 12 is protected and restrained by the belt 13 in the event of an emergency of the vehicle or when the running state is unstable, and changes in posture and position are suppressed, and the desired safe state is maintained.

  The seat belt device 10 and the retractor 16 and the like having the above configuration 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.

  Next, a control system for the seat belt device 10 and the like will be described from the hardware viewpoint with reference to the block diagram of FIG.

  In FIG. 6, the control device 26 is constituted by a CPU. A block 30 including the control device 26 represents an electric pretensioner unit for holding the 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 that stores data and a control program.

  On the input side of the block 30, a block showing the 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 a detection signal output from the winding position 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 on 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. Among these input side elements, a detection unit for detecting the running state or behavior state of the vehicle such as a vehicle speed sensor is also included. 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 of a built-in buckle switch. 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 the warning lamp 48 when the seat belt is not normally used when the vehicle is traveling.

  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 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 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.

  FIG. 7 is a functional block diagram conceptually showing the structure of the basic functional part of the control system of the seat belt device 10 according to the present embodiment. This control system includes, as main elements, a belt attachment / non-attachment determination unit 61, an origin position storage unit 62, a belt displacement detection unit 63, a seat belt device control unit 64, and a belt drive unit 65. Yes.

  The belt attachment / non-attachment determination unit 61 is a unit that determines whether or not the belt 13 is attached to the occupant 11 in the seat 12. In the present embodiment, whether the belt is attached or not is determined based on the on / off state of the buckle switch 19. When the belt 13 is wound up by the retractor 16 after the attached state of the belt 13 is released, the origin position storage unit 62 stores the origin position in the origin position (the belt is completely retracted or retracted). It is means for storing such data. The belt displacement detector 63 is a means for detecting a change in position (winding state) of the belt 13 when the belt 13 is wound by the retractor 16. The belt displacement detector 63 includes the rotation detector 25 and the rotation state detector 110 described above.

  The seat belt device control unit 64 functions as a restraint control for protecting a normal occupant as an electric pretensioner, and a storage control function for storing the belt at the home position (belt complete storage position) after the belt is released. And a hooking state detection function when performing storage control, and a control function for changing a determination condition for detecting a characteristic hooking state in the present embodiment. The seat belt device control unit 64 includes the arithmetic processing function of the control device (CPU) 26 described above, and an R side motor drive control unit 35 and an L side motor drive control unit 36.

  The belt drive unit 65 corresponds to the retractor 16 described above, and more specifically, the R-side motor 51 and the L-side motor 52 described above.

  Next, a characteristic operation control example of the seat belt device 10 implemented by the seat belt device control unit 64 and the like based on the above-described configuration shown in FIGS. 6 and 7 and the flowcharts shown in FIGS. 8 and 9. Will be explained. In this example, an example of the R-side motor 51 will be described. FIG. 8 is a flow chart showing characteristic operation control, and FIG. 9 is a detailed flow chart for “storage control”.

  Usually, in order to run the vehicle, the occupant 11 is seated on the seat 12, the belt 13 is wound around the body, and the tongue plate 17 is coupled to the buckle 18 (R side buckle 47R), the belt 13 is attached to the occupant 11 body. . At this time, the buckle switch 19 is turned on. On the contrary, when the traveling of the vehicle is finished and the occupant 11 sitting on the seat 12 removes the tongue plate 17 from the buckle 18, the buckle switch 19 is turned off. Normally, when the belt 13 is released and the belt 13 is in a free state, the belt 13 is drawn to the origin position based on the “storage control” function of the electric pretensioner unit 30 of the retractor 16, and the retractor 16.

  In the flowchart shown in FIG. 8, in the first determination step S11, it is determined whether the operation state of the buckle switch 19 is on or off. When the buckle switch 19 is on (YES in step S11), a “sag removal control” process is executed. When the buckle switch 19 is off (NO in step S11), the “storage control” process is executed.

  First, the process of “slack removal control” when the buckle switch 19 is on in the determination step S11 will be described.

  Usually, in the seat belt device 10 in which a belt is mounted on the body of the occupant 11, personal information and setting information of the occupant 11 are acquired as a basic operation. It is assumed that occupant information and setting information are prepared in advance and stored in the recording unit 37 shown in FIG. Crew information includes gender information, physique information, and the like. The setting information is information set as a preference according to the intention of the occupant 11. Based on the occupant information and setting information of the occupant 11 and the belt displacement information when the occupant 11 actually sits on the seat 12 and wears the belt 13 and the belt 13 is displaced by the rotation detection unit 25, the occupant 11 of the seat 12 The position is determined. When the occupant information, the setting information, or the belt displacement information by the rotation detection unit 25 cannot be obtained, the position of the occupant 11 cannot be determined.

  In the next determination step S12, it is determined whether or not the position of the occupant 11 has been determined. If NO in determination step S12, the process proceeds to the return terminal, and if YES, the process proceeds to step S13 of “sag removal control”. The process of “loosening control” is well known, and based on the function of the electric pretensioner unit 30 described above, the slack of the belt 13 attached to the occupant 11 sitting on the seat 12 is optimized. The belt 13 is wound up by the retractor 16.

  After predetermined “slack removal control”, it is determined in the determination step S14 whether or not the belt 13 is at the optimum tension or whether there is no slack. The belt displacement information obtained from the rotation detector 25 is used for the determination in the determination step S14. If YES in determination step S14, a control stop process is executed (step S15). In this control stop process, “sag removal control” is stopped. If NO in determination step S14, the process proceeds to the return terminal, and "sag removal control" is repeated under predetermined conditions.

  Next, the “storage control” process will be described. “Storage control” is executed as the next stage when the buckle switch 19 is OFF in the determination step S11. Note that the fact that the buckle switch 19 is off means that the belt 13 is not attached.

  Processing step S21 is a step of executing the “storage control” process. The detailed contents of step S21 for executing the “storage control” process are shown in FIG. First, the entire storage control process will be outlined with reference to FIG.

The storage control is executed under the condition that the buckle switch 19 is off (NO in determination step S201). In the storage control, energization for causing the motor 23 to perform the belt winding operation is started after a predetermined time set in advance first (YES in step S202) (step S203). When starting the energization for the winding operation to the motor 23, started by setting the timer as t = t ₀ at the next step S204.

  Next, a variable i prepared in advance is set to 0 (step S205). The variable i is a counter that is set as a counter and is used to determine a catching state that occurs in the storing operation of the belt 13 based on storage control. The hook determination is determined when the determination state that the variable i is a hook is maintained even if the variable i becomes equal to or greater than a preset value N.

  In the next determination step S206, it is determined whether or not the variable i is smaller than N. When the variable i is smaller than N, the process proceeds to step S207 to determine whether or not there is a change in the rotation angle. Information related to the change in the rotation angle is obtained based on a signal extracted via the rotation detection unit 25, the rotation state detection unit 110, the rotation angle detection unit 113, and the like described above.

  If the variable i is greater than or equal to N in the determination step S206, it is assumed that a catch has occurred in the operation state of the storage control of the belt 13, and that the lock state has occurred for some reason in the winding operation by the retractor 16, the process proceeds to step S217. Then, the energization to the motor 23 is stopped, and the belt winding storage control is stopped.

  The presence / absence of the rotation angle change determined in the determination step S207 is information obtained based on the two pulse signals P1, P2 having substantially different phases output from the rotation detection unit 25.

  When there is no change in the rotation angle in determination step S207 (in the case of NO), if this state has elapsed for a predetermined time (YES in determination step S218), a hook determination process (step S219) is executed. Thereafter, the variable i increments the count value by 1 (step S220) and returns to the determination step S206. If NO in determination step S206, the process immediately returns to determination step S217. In the hook determination processing step S219 and the count value increasing step S220, the occurrence of the hook state in the “storage control” is detected and monitored.

If there is a change in the rotation angle in the above-described determination step S207 (in the case of YES), in the next determination step S208, the winding position (x) of the belt 13 by the belt reel 22 is within a predetermined range (x ₀ <x <x ₁ ) Is included. If YES in determination step S208, time difference threshold value dt _th is set to dt ₂ (step S209), and if NO, time difference threshold value dt _th is set to dt ₁ (step S210). After the process of step S209 or step S210, the process proceeds to the next determination step S211.

In the next determination step S211, it is determined whether or not the rotation of the belt reel 22 that rotates by energization of the motor 23 is rotation in the winding direction. If NO in determination step S211, the winding operation is not normal, so the process proceeds to catch determination processing step S219, and returns to determination step S206 via step S220. In the case of YES in the determination step S211, the time related to the change interval (dt = t ₁ −t ₁₋₁ ) is measured (step S212). Here, “dt” means the difference between the time at the previous change and the time at the current change.

In the next decision step S216, the time dt of the measured change interval, compared with the first reference value dt ₀ for hook determination, determines the magnitude relation. If dt is smaller than dt ₀ , it is determined in the next determination step S216 whether or not the belt 13 is stored in the original storage position, that is, the origin position (complete storage position). If YES in the determination step S216, the process proceeds to step S217, and the process ends as the storage control is completed. If NO in determination step S216, the process returns to determination step S206.

If NO in the determination step S213, the process proceeds to determination step S214. In the determination step S214, the above dt is compared with the second reference value dt _th for the hook determination, and the magnitude relation is determined. If dt is smaller than dt _th in the determination step S214, it is determined that the hook state has not been reached, and the amount of current supplied to the motor 23 is increased to increase the winding force (step S215). Thereafter, the process proceeds to the determination step S216. In the case determination at step S214 is dt is dt _th or executes catching determination process proceeds to the step S219 as being reached catch state.

  Here, the description returns to step S21 of the “storage control” shown in FIG. In the storage control processing step S21, the storage control described above is executed when the buckle switch 19 is turned off as described above. According to the storage control, the winding operation for displacing the belt 19 to the home position is performed on the condition that the buckle switch 19 is turned off, that is, the belt 13 is not attached. This is done by the tensioner mechanism. However, in the storage control by the processing step S21, the determination step S22 is actually executed at an appropriate stage during the above-described “storage control”. The determination step S22 is a position (or distance) from the origin position with respect to the belt 13 in the storage operation state based on the storage control, that is, a position close to ("near") or a position far away ("far"). It is determined whether there is any. Here, the “near position” and the “far position” are not strictly defined, and are appropriately set as a criterion for determination according to the likelihood or difficulty of the hooked state.

  Information on the position (distance) from the origin position in the determination step S22 is obtained by the rotation detection unit 25 and the rotation state detection unit 110 provided in the control device 26 described above.

If it is determined as “near” in the determination step S22, whether or not the two-phase pulse signals P1 and P2 output from the rotation detection unit 25 are caught in comparison with the pulse change interval (Pa). Adjustment control is performed such that the reference value for determining is small (step S23). If it is determined that the distance is “distant”, adjustment control is performed so that the reference value increases (step S24). This reference value is a threshold condition for determining whether or not the hooking state (locked state) occurs in the winding operation of the belt 13 in the storage control and the storage control is stopped. The reference value corresponds to the threshold value “dt _th ” used for determining whether or not it is in the hooked state in the determination step S214 shown in FIG.

  After adjusting the reference value in each of steps S23 and S24, the process proceeds to the return terminal. Therefore, in the subsequent “storage control (step S21)”, the hooking state during the storage control is determined based on the newly set reference value.

  Here, the reason why the reference value is reduced when it is “near” from the origin position and the reference value is increased when it is “far” is that the belt 13 exists in the vicinity of the buckle 18 at a position far from the origin position. Since the catching condition is likely to occur, the criterion value is increased to loosen the judgment condition for the occurrence of the catching condition. On the other hand, the judgment condition is tightened because the catching condition is unlikely to occur near the origin position. is there.

  For the above reasons, it is basically desirable to set the reference value so that the value becomes smaller as the winding position of the belt 13 is closer to the origin position (complete storage position) of the belt 13. Furthermore, the reference value is set to a relatively large value when the winding position of the belt 13 is included in the range where the hooked state is likely to occur in the storage control of the belt 13, and the reference value is set when the belt 13 is not included in the range. It is desirable to set to a relatively small value.

  FIG. 10 shows two-phase pulse signals P1 and P2 output from the rotation detector 25, and further shows an example of the pulse change interval Pa. In FIG. 10, two types of pulse change intervals Pa are shown. The pulse change interval Pa is counted as a time from when a change occurs in one pulse signal until a change occurs in the other pulse signal.

  Next, explanation will be given on “sag removal control”. The “slack removal control” process described with reference to FIG. 8 is performed when the occupant 11 is seated on the seat, the belt 13 is attached, the tongue plate 17 is coupled to the buckle 18 and the buckle switch 19 is turned on. It was control. In this case, the state of the ignition switch was not a problem. Actually, slack removal control is performed depending on whether the ignition switch is on or off. The case where the ignition switch is on is a case where the seat belt is mounted after driving the engine or the like, and the case where the ignition switch is off is a case where the seat belt is mounted before driving the engine or the like.

  With reference to FIG. 11, the flow of “slack removal control” when the seat belt is worn will be described. In the first determination step S31, it is determined whether or not the ignition switch (IG) is off. When the determination step S31 is YES, the retractor side control is executed (step S32), and when the determination is NO, the buckle side control is executed (step S33). The control on the buckle side is as already described in FIG.

  In the retractor-side control in step S32, the retractor 16 is set in an operating state. In the next determination step S34, it is determined whether or not the belt 13 is pulled out. If there is no drawer in the determination step S34 (in the case of NO), it is determined whether or not a certain time has elapsed (step S40), and when the certain time has elapsed, storage control is executed (step S41). If the fixed time has not elapsed, the process proceeds to the return terminal. The storage control in step S41 is substantially the same as the storage control in step S21 described in FIG. After step S41, the process proceeds to determination step S38, where it is determined whether or not the belt 13 is in a constant tension state.

  On the other hand, if there is a drawer in step S34 (in the case of YES), it is determined whether or not the length of the belt 13 is equal to or longer than the length in the vacant seat mounted state (step S35). If NO in determination step S35, the process proceeds to the return terminal. If YES, the process proceeds to next determination step S36. The storage control (step S41) is executed if NO in the next determination step S36, and the slack removal control (step S37) is executed if YES. When the slack removal control (step S37) is completed, it is determined in the next determination step S38 whether or not the tension is constant. If NO in determination step S38, the process proceeds to the return terminal, and if YES, control (loosening control or storage control) is stopped (step S38). Thereafter, return processing is performed via the return terminal.

  The portion 300 composed of the above two steps S35 and S36 is a functional portion that determines whether or not the seat belt is in the mounted state.

  In the slack removal control described above, in the determination of the hook state in the above-described storage control (step S41), the determination condition of the hook state is set to the position of the belt 13 by the same method as described with reference to FIG. I am trying to change it accordingly. The determination of the tension shown in the determination step S38, that is, the determination of the hooking state is performed using the determination condition of the hooking state that is adjusted and controlled in this way.

  Next, with reference to FIG. 12, the flow of “sag removal control” when the seat belt is not worn will be described. The “loosening control” when the seat belt is not worn is substantially the same as the “storage control”. In the flowchart shown in FIG. 12, steps S31, S32, and S33 are the same as described above, and a description thereof will be omitted.

  In the retractor-side control (step S32), it is determined in the next determination step S51 whether or not the belt 13 is in the winding state. If NO in the determination step S51, the winding operation, that is, the storage control is unnecessary, so that the process immediately shifts to the return terminal.

  On the other hand, when the belt is wound in the determination step S51 (in the case of YES), it is determined whether or not the length of the belt 13 is equal to or less than the length in the vacant seat mounted state (step S52). If NO in determination step S52, the process proceeds to the return terminal. If YES, the next storage control (step S53) is executed.

  The storage control in step S53 is substantially the same as the storage control in step S21 described in FIG. After step S53, the process proceeds to determination step S54, and it is determined whether or not the belt 13 is in a constant tension state. If NO in determination step S54, the process returns. If YES, the process proceeds to next determination step S55. In the next determination step S55, it is determined whether or not the wound belt 13 is in the storage position. If NO in determination step S55, the process returns. If YES, control stop processing is executed (step S56). After the control stop processing step S56 is executed, the storage control ends.

  In the above, if NO in determination step S55, the process returns and the storage control (step S53) is repeated. When this flow of control is repeated several times, control is usually configured to transition to control stop.

  The portion 500 including the above two steps S51 and S52 is a functional portion that determines whether or not the seat belt is in a non-wearing state.

  In the above control, in the determination of the hooking state in the above-described storage control (step S53), the hooking state determination condition is set according to the position of the belt 13 by the same method as described with reference to FIG. I try to change it. The determination of the tension shown in the determination step S54, that is, the determination of the hook state is performed using the determination condition of the hook state that is adjusted and controlled in this way.

  Next, with reference to FIGS. 13 to 16, the storage control of the seat belt device according to another embodiment of the present invention will be described. In this embodiment, when the seat belt is stored based on the storage control, when the belt catching occurs and the storage operation is interrupted, the number of belt winding resumption operations (retry) is determined according to the section related to the belt winding position. It is determined as appropriate to prevent interruption of the storing operation and shorten the time required for storing the belt.

  FIG. 13 shows a section relating to the belt winding position during seat belt storage control. FIG. 13 is a front view of the occupant 11 sitting on the driver's seat 12. When the tongue plate 17 is removed from the buckle 18 and the belt 13 is released from the seat belt device 10, the storage control is started. FIG. 13 shows a state in the middle of the storing operation for storing the belt 13 to the origin position. In the state diagram shown in FIG. 13, two sections 201 and 202 are shown. The section 201 is a “hand hit section”, and the section 201 is other sections. Here, the “hand hit section” 201 is a section from the buckle-off to an appropriate position in the vicinity of the right shoulder of the occupant 11, and a relatively large number of belts when belt catching (hand hit) occurs. This is a section in which the winding resumption operation is attempted. At this time, the belt storage operating speed is set to a high speed. In this way, “hand control” is executed in the hand section 201. On the other hand, the other section 202 is a section in which belt catching after the handling section 201 does not occur so much, and when the full storage determination control is executed and belt catching (working) occurs, a relatively small number of times. This is a section in which belt winding resumption operation is attempted. The “all storage determination control” is a control for storing all the amounts, and even if there is a subsequent belt withdrawal, the entire storage control is continued without returning to the handle control. At this time, the belt storage operating speed is set to a low speed. In this way, “all storage determination control” is executed in the other section 202.

  As for the device configuration for executing the belt storage control of the seat belt device 10 according to the present embodiment, the basic configuration is shown in FIG. 14, and the basic control flow is shown in FIG. In FIG. 14, the same elements as those described in FIG.

  In the configuration of the present embodiment, as described above, when the belt 13 is in the storage operation state, the handling section 201 and the other section 202 are set, and the handling control and the total storage determination control are executed, respectively. In each of the hitting control and the full storage control, the rewinding operation of the belt 13 is different. Therefore, in the seat belt device control unit 64, as a functional element, the hook detecting means 64a for detecting the hooked state of the belt 13 and the belt winding when the hook detecting means 64a detects the hooked state of the belt 13 are detected. Resuming means 64b for re-controlling the operation, and resuming for changing the number of times of resuming the control of the belt winding operation set by the resuming means 64b according to the rotational position detected by the belt displacement detector 63 (rotational position detecting means). A number-of-times changing means 64c.

  According to the basic control flow of the present embodiment shown in FIG. 15, it is determined whether or not the buckle switch 19 is off (step S301). When it is off, it is determined whether or not it is the handling section 201. (Step S302). In the determination step S302, if it is determined that it is a hit section, the handle control is executed (step S303), and if not, the all storage determination control is executed (step S304). After step S304, the all storage flag is set (step S305), and after that, all storage determination control is continued.

  FIG. 16 shows a detailed flowchart for explaining the storage control of the seat belt device according to the present embodiment. The control flow shown in FIG. 16 shows the process of “storage control” to the home position when the belt 13 is released, and the handling control or the full storage determination control described in FIGS. 13 to 15 is executed. Process. In FIG. 16, the same steps as those described in the flowchart of FIG. 9 described above are denoted by the same reference numerals, and description thereof is omitted. In this flowchart, it is determined in the first determination step S401 whether or not the buckle switch 19 is off. If it is off, the processing from step S202 onward is executed.

In particular, the characteristic step in this control flow is that when there is a change in the rotation angle in the determination step S207 (in the case of YES), the winding position (x) of the belt 13 by the belt reel 22 is determined in the next determination step S402. It is determined whether or not it is included in a predetermined range (x ₀ <x <x ₁ ). In the storage control of the present embodiment, the predetermined range (x ₀ <x <x ₁ ) is a range set as the “hand hit section 201” described above. If YES in determination step S402, the number of retries N is set to “N1” in the case of the hit control (S303) (step S403), and if NO, the number of retries N 2 is in the case of full storage determination control. “N2” is set (step S404). After the process of step S403 or step S404, the process proceeds to the next determination step S211.

  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 in a vehicle seat belt device to reduce the interruption in the belt storing operation based on the storage control and to securely store the entire belt.

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. It is a side view which shows the principal part structure of the rotation detection part in this embodiment. It is a front view of the principal part structure of the rotation detection part in this embodiment. It is a block diagram which shows the structure of the rotation state detection part provided in the inside of a control apparatus. 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 functional block diagram which shows the function structure of the principal part of the control system of the seatbelt apparatus which concerns on this embodiment. It is a flowchart which shows the characteristic control flow of the seatbelt apparatus which concerns on this embodiment. It is a flowchart for demonstrating accommodation control of the seatbelt apparatus which concerns on this embodiment. It is a wave form diagram which shows the change interval of the signal between the two pulse signals output from a rotation detection part. It is a flowchart which shows the other control flow of the seatbelt apparatus which concerns on this embodiment. It is a flowchart which shows the other control flow of the seatbelt apparatus which concerns on this embodiment. It is a figure for demonstrating the displacement area of the seatbelt at the time of the accommodation operation | movement by other embodiment of this invention. It is a functional block diagram which shows the function structure of the principal part of the control system of the seatbelt apparatus which concerns on other embodiment of this invention. It is a flowchart which shows the characteristic control flow of the seatbelt apparatus which concerns on other embodiment. It is a flowchart for demonstrating accommodation control of the seatbelt apparatus which concerns on other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Seat belt apparatus 11 Crew 13 Belt 16 Retractor 22 Belt reel 23 Motor 25 Rotation detection part 26 Control apparatus 30 Electric pretensioner unit 64 Seat belt apparatus control part

Claims (6)

A belt reel that winds the belt, a pretensioner mechanism that rotates the belt reel using the driving force of the motor and pulls in the belt, a control means that controls the amount of current applied to the motor, and the rotation of the belt reel In a vehicle seat belt apparatus having a rotation control means for detecting an operating state, wherein the control means has a storage control function of storing the belt using the pretensioner mechanism.
The control means includes
When the belt is in the storage operation state, based on the information on the rotation operation state detected by the rotation detection unit and the determination condition for determining whether or not the belt is in the hooking state, A hook detection means for detecting the belt hooking state;
Determination condition adjusting means for changing the determination condition set by the catch detection means according to the winding position information of the belt obtained by the rotation detection means;
Equipped with a,
The hook detection means detects that the hook is in a hooked state when a time required for a predetermined change amount of the winding position of the belt obtained by the rotation detection means exceeds a predetermined reference value under the determination condition. and the determining condition adjusting means, the seat belt device of a vehicle the winding position, characterized in that you set the reference value such as the value becomes smaller closer to the belt fully stored position. The determination condition adjusting means sets the reference value to a relatively large value when the winding position is included in the range in which the catching state is likely to occur, and sets the reference value to a relative value when not included in the range. The vehicle seat belt device according to claim 1 , wherein the seat belt device is set to a small value. The vehicle seat belt device according to claim 1 or 2, wherein the predetermined reference value is a value corresponding to a pulse change interval of a pulse signal output from the rotation detecting means. The storage control belt retracting operation is based on the functional, the seatbelt device for a vehicle according to any one of claims 1 to 3, characterized in that it is performed in a non-connecting state of the belt of the control means. The storage control belt retracting operation is based on the functional, the seatbelt device for a vehicle according to any one of claims 1 to 3, characterized in that it is performed in connection with the slack eliminating control of said control means. A belt reel that winds the belt, a pretensioner mechanism that rotates the belt reel by using a driving force of a motor and pulls in the belt, a rotational position detector that detects a rotational position of the belt reel, and the rotational position Control means for driving and controlling the motor based on the rotational position detected by the detecting means, and the control means drives the motor when the belt is released to retract the belt in the retracted position. In a seat belt device for a vehicle that performs take-off control,
The control means includes
When the belt is in the retracting operation state, the belt engagement state based on the rotation position detected by the rotation position detection means and the determination condition for determining whether or not the belt is in the engagement state. A catch detection means for detecting
Resumption means for performing the winding control again when the hook detection means detects the hooked state of the belt;
Resumption count changing means for changing the number of resumptions of the winding control set by the resumption means according to the rotation position detected by the rotation position detection means;
Equipped with a,
The hook detecting means detects that the hook is in a hooked state when a time required for a predetermined change amount of the rotational position of the belt reel obtained by the rotational position detecting means exceeds a predetermined reference value under the determination condition. and, and the resume count, the rotational position becomes many times near the mounting position of the belt, the rotational position of the vehicle, characterized that you set to be a small number of times in a storage position near the belt Seat belt device.

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