JP2011031664A - Seat belt device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device for a vehicle capable of reducing a dark current while preventing comfortability from being impaired. <P>SOLUTION: The seat belt device for the vehicle includes: an IG state detection part for detecting the state of ignition; a controller 21 for performing drive-control of a motor 10; a door opening/closing detection part for detecting the state of the vehicle; a battery voltage detection part; a rotary sensor for detecting the state of a seat belt; and a buckle switch. The controller 21 changes an energization time to the motor 10 after variation from ON to OFF of ignition is detected based on the state of the vehicle or the state of the seat belt. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle seat belt device that restrains a seated occupant by webbing.

  2. Description of the Related Art Conventionally, there is known a seat belt device in which appropriate occupant restraint can be obtained by pulling a webbing by a motor according to a vehicle state. In this way, in the seat belt device of the type in which the webbing is drawn by the motor, in order to reduce dark current, a device that cuts off the power supply to the switch that detects the seat belt wearing state during sleep has been proposed (for example, , See Patent Document 1).

JP 2008-238840 A

  However, in the above-described conventional seat belt device, since the seat belt control may suddenly stop when the occupant does not intend, there is a problem in that the occupant may feel uncomfortable and comfort may be impaired.

  The present invention has been made in view of the above circumstances, and provides a vehicle seat belt device capable of reducing dark current while preventing comfort from being impaired.

  In order to solve the above-described problems, the invention described in claim 1 includes a belt reel (for example, the belt reel 12 in the embodiment) around which a webbing (for example, the webbing 5 in the embodiment) is wound, and the belt reel. A vehicle seat belt including a motor (for example, the motor 10 in the embodiment) that rotationally drives the motor and a transmission mechanism (for example, the power transmission mechanism 13 in the embodiment) that transmits driving between the motor and the belt reel. An apparatus (for example, the seat belt apparatus 1 in the embodiment), and an ignition state detection unit (for example, the IG state detection unit 32 in the embodiment) that detects an ignition state, and a control unit that performs drive control of the motor ( For example, the controller 21) in the embodiment and vehicle state detection means for detecting the state of the vehicle For example, a door opening / closing detection unit 33 and a battery voltage detection unit 34 in the embodiment, and a seat belt state detection unit (for example, the rotation sensor 11 and the buckle switch 31 in the embodiment) for detecting the state of the seat belt are provided. The control means is characterized in that, based on the state of the vehicle or the state of the seat belt, the energization time to the motor after detecting a change from ignition on to off is changed.

  According to a second aspect of the present invention, in the first aspect of the present invention, the vehicle state detecting means detects an open / closed state of a door of the vehicle.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the vehicle state detecting means detects a battery voltage of the vehicle.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the seat belt state detecting means detects a displacement of the webbing.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the seat belt state detecting means detects a state of a buckle.

  According to the first aspect of the invention, since the state of the seat belt and the vehicle state change according to the state of the occupant, the motor after the occupant turns off the ignition based on the state of the seat belt and the vehicle state. By changing the energization time to the motor, after the ignition is turned off, the motor is energized for a time corresponding to the state of the occupant, and then the motor is deenergized. Therefore, it is possible to reduce dark current by stopping energization of the motor while preventing energization of the motor suddenly when the occupant does not intend to give the occupant a sense of discomfort and impairing comfort. There is an effect that can.

  According to the invention described in claim 2, in addition to the effect of claim 1, based on the open / closed state of the door of the vehicle, for example, when the door is closed, it is assumed that the occupant stays in the passenger compartment. Therefore, by setting the energization time relatively long in this case, there is an effect that it is possible to reduce the dark current while reducing the uncomfortable feeling to the passenger.

  According to the invention described in claim 3, in addition to the effect of claim 1 or 2, when the battery voltage of the vehicle is low, there is a possibility of affecting the engine restart of the vehicle. There is an effect that the burden on the battery can be reduced by stopping energization of the motor and suppressing power consumption.

  According to the invention described in claim 4, in addition to the effect of any one of claims 1 to 3, when the webbing is displaced during winding or the like, after the webbing is completely wound, the motor By changing the energization time so that the energization of the vehicle is stopped, there is an effect that the dark current can be further reduced without causing the passenger to feel uncomfortable.

  According to the invention described in claim 5, in addition to the effect of any one of claims 1 to 4, based on the state of the buckle, for example, when the buckle is ON, the occupant is seated and the seat belt is mounted. When the buckle is OFF, it can be assumed that the seat belt is not attached. Therefore, the energization time should be changed according to the assumed passenger state from the buckle state. Therefore, there is an effect that the dark current can be further reduced without causing the passenger to feel uncomfortable.

It is a schematic structure figure of a seatbelt device of an embodiment of the present invention. It is a schematic block diagram of the retractor and controller of the seatbelt apparatus of embodiment of this invention. It is a flowchart which shows the change control process of the electricity supply time to the motor of the seatbelt apparatus of embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows an overall schematic configuration of a seat belt device 1 according to the present invention. In FIG. 1, reference numeral 2 denotes a seat on which an occupant 3 is seated. The seat belt device 1 of this embodiment is a so-called three-point seat belt device, and a webbing 5 is drawn upward from a retractor 4 attached to a center pillar (not shown), and the webbing 5 is supported on the upper side of the center pillar. The tip of the webbing 5 is fixed to the vehicle body floor via an outer anchor 7 near the outside of the passenger compartment of the seat 2. A tongue plate 8 is inserted between the through anchor 6 and the outer anchor 7 of the webbing 5, and the tongue plate 8 can be attached to and detached from the buckle 9 fixed to the vehicle body floor of the seat 2 on the inner side of the vehicle body. It has become.
The webbing 5 is wound around the retractor 4 in the initial state, and the occupant 3 pulls it out by hand to fix the tongue plate 8 to the buckle 9, thereby restraining the chest and abdomen mainly of the occupant 3 with respect to the seat 2. To do. Further, the seat belt device 1 automatically performs the winding adjustment of the webbing 5 by the electric motor 10 when the behavior of the vehicle becomes unstable.

  As shown in FIG. 2, the retractor 4 has a webbing 5 wound around a belt reel 12 rotatably supported by a casing (not shown), and a shaft of the belt reel 12 projects from one end side of the casing. . The belt reel 12 is connected to a rotating shaft 10 a of the motor 10 via a power transmission mechanism 13 so as to be interlocked. The power transmission mechanism 13 decelerates the rotation of the motor 10 and transmits it to the belt reel 12. Further, the retractor 4 is provided with a winding spring (not shown) that urges the belt reel 12 in the webbing winding direction. When the belt reel 12 and the motor 10 are separated by a clutch (not shown), Tension acts on the webbing 5.

The retractor 4 is provided with a rotation sensor 11 that detects the rotational position of the belt reel 12. The rotation sensor 11 includes, for example, a magnetic disk in which different magnetic poles are alternately magnetized along the circumferential direction and rotates integrally with the belt reel 12, and a pair disposed in the vicinity of the outer peripheral edge of the magnetic disk. And a sensor circuit for processing a detection signal of the Hall element, and a pulse signal processed by the sensor circuit is output to the controller 21.
In this case, the pulse signal input from the sensor circuit to the controller 21 according to the rotation of the belt reel 12 is used to detect the rotation amount (rotation position), rotation speed, rotation direction, and the like of the belt reel 12. That is, the controller 21 detects the amount of rotation of the belt reel 12 (the amount of winding / drawing of the webbing 5) by counting the pulse signal, and calculates the change rate (frequency) of the pulse signal to calculate the belt reel. 12 is obtained, and the rotation direction of the belt reel 12 is detected by comparing the rising edges of the waveforms of both pulse signals.

  Incidentally, on the input side of the controller 21, as shown in FIG. 2, in addition to the rotation sensor 11, an acceleration in the longitudinal direction and the lateral direction of the vehicle and an angular acceleration in the yaw direction of the vehicle are detected. Sensor 30, buckle switch 31 that detects attachment / detachment of tongue plate 8 to / from buckle 9, IG state detection unit 32 that detects the ON / OFF state of the ignition, door open / close detection unit 33 that detects the open / closed state of the door of the vehicle, A battery voltage detector 34 that detects the voltage of a mounted battery (not shown), a current sensor 40 that detects a current supplied to the motor 10, and the like are connected. During traveling of the vehicle, energization control for the motor 10 is performed mainly based on the detection result of the yaw G sensor 30.

Hereinafter, an example of change control of the energization time to the motor 10 by the controller 21 of the seat belt apparatus 1 will be described based on the flowchart of FIG. This control process is performed after the ignition (IG) is turned off after the vehicle is stopped.
First, based on the detection result of the IG state detection unit 32, an elapsed time after the ignition is changed from the ON state to the OFF state (IG_OFF) is set to a predetermined time (which is set in advance as a time when this control process can be started). For example, it is determined whether it is within 2 minutes (step S01).

  As a result of this determination, if it is determined that the elapsed time after the ignition changes from the ON state to the OFF state exceeds the predetermined time during which this control process can be started (NO in step S01), the sheet is immediately The belt control is stopped, that is, the energization to the motor 10 is stopped (step S13), and this routine is once ended (returned).

  On the other hand, if it is determined that the ignition is within 2 minutes after the ignition state changes from the ON state to the OFF state (YES in step S01), the ignition state changes from the ON state to the OFF state based on the detection result of the door opening / closing detection unit 33. Thereafter, it is determined whether or not the state of the vehicle door is maintained in the closed state (step S02). Here, the door of the vehicle is a door of a seat where the seat belt device 1 to be controlled is installed.

  As a result of this determination, when it is determined that the vehicle door is not maintained in the closed state (NO in step S02), it is assumed that the occupant 3 gets on and off and sits down again, or the seat belt is mounted again. Therefore, the energizing time for energizing the motor 10 from the time when the ignition changes from the ON state to the OFF state is set to a relatively long predetermined time (for example, about 2 min) (step S12), and the motor 10 is set for the set energizing time. Then, the seat belt control is stopped (step S13), and this routine is temporarily terminated.

On the other hand, when it is determined that the state of the vehicle door is maintained in the closed state after the ignition is changed from the ON state to the OFF state (YES in step S02), based on the detection result of the battery voltage detection unit 34. Then, it is determined whether or not the battery voltage is equal to or higher than a predetermined voltage (for example, 11 V) necessary for starting the engine (step S03).
If the battery voltage is smaller than the predetermined voltage as a result of this determination (NO in step S03), the time during which the motor 10 is energized after the ignition changes from the ON state to the OFF state is set to “0” (no extension). ), The seat belt control is stopped without energization (step S13), and this routine is temporarily terminated.

  On the other hand, when it is determined that the battery voltage is equal to or higher than the predetermined voltage (YES in step S03), the winding of the webbing 5 is performed after the ignition changes from the ON state to the OFF state based on the detection result of the rotation sensor 11. It is determined whether or not there is no change (webbing displacement) in the removal amount (step S04).

  As a result of this determination, if it is determined that there is a change in the winding amount of the webbing 5 (NO in step S04), it is determined whether or not the winding amount is near the entire storage position of the webbing 5 (step S08). If it is determined that it is not near the full storage position (NO in step S08), it is assumed that the webbing 5 is being wound up, so that the motor 10 is wound up to the full storage position. Is set to a predetermined energization time (for example, about 3 min) longer than the energization time of step S12 described above (step S10), and the energization of the motor 10 is continued for the set energization time, and then the seat belt control is stopped. (Step S13), and this routine is once ended.

  If it is determined that the position is near all the storage positions (YES in step S08), it is assumed that the webbing 5 is almost completely wound up, and therefore, the predetermined time shorter than the energization time in step S12 described above. (For example, about 1 min) is set (step S09), and the energization of the motor 10 is continued for the set energization time, then the seat belt control is stopped (step S13), and this routine is ended once. To do.

  On the other hand, if it is determined that there is no change in the winding amount of the webbing 5 (YES in step S04), the buckle switch is changed after the ignition changes from the ON state to the OFF state based on the detection result of the buckle switch 31. It is determined whether or not the 31 ON state is maintained (step S05).

  As a result of this determination, if it is determined that the ON state of the buckle switch 31 is not maintained (NO in step S05), the webbing 5 is pulled out and the tongue plate 8 is detached from the buckle 9 by the occupant 3. Therefore, an energization time equivalent to step S12 described above (for example, about 2 min) is set (step S07), and energization of the motor 10 is continued for the set energization time. After that, the seat belt control is stopped (step S13), and this routine is once ended.

  On the other hand, if it is determined that the ON state of the buckle switch 31 is maintained (YES in step S05), the webbing 5 is pulled out and the tongue plate 8 is attached to the buckle 9. Since the seating state of the occupant 3 may continue as it is, a predetermined energization time (for example, about 30 s) shorter than the energization time in step S09 is set (step S06), and the set energization After the energization of the motor 10 is continued for the time, the seat belt control is stopped (step S13), and this routine is once ended.

  Therefore, according to the above-described embodiment, the state of the seat belt detected by the rotation sensor 11 and the buckle switch 31 and the vehicle state detected by the IG state detection unit 32 and the door opening / closing detection unit 33 are respectively Since it changes according to the state, based on the state of these seat belts and the vehicle state, the occupant 3 changes the energization time to the motor 10 after operating the ignition from ON to OFF, so that the ignition is changed from ON. Since the motor 10 is energized for a time corresponding to the state of the occupant 3 after the operation is turned off, the energization of the motor 10 is stopped. Therefore, the energization of the motor 10 is suddenly stopped when the occupant 3 does not intend. The dark current can be reduced by stopping energization of the motor 10 while preventing the passenger 3 from feeling uncomfortable and impairing comfort. It can be.

  In addition, when the closed state of the door is maintained, it is assumed that the occupant 3 remains in the passenger compartment, and therefore, based on the open / closed state of the vehicle door that is the detection result of the door open / close detection unit 33. When it is determined that the closed state of the door is maintained, the dark current can be reduced while reducing the sense of discomfort to the occupant 3 by setting the energization time relatively long.

  Further, when the vehicle battery voltage is low, there is a risk of affecting the engine restart of the vehicle. In such a case, the motor 10 is immediately energized after the ignition changes from the ON state to the OFF state. By stopping and suppressing power consumption, the burden on the battery can be reduced.

  When the webbing 5 is displaced during winding, the occupant feels uncomfortable by changing the energization time so that the energization of the motor 10 is stopped after the webbing 5 is completely wound. Further reduction of dark current can be achieved without giving.

  Further, based on the state of the buckle 9 detected by the buckle switch 31, when the buckle switch 31 is ON, it can be assumed that the occupant 3 is seated and wearing a seat belt, and the buckle switch 31 is OFF. In this case, since it can be assumed that the occupant 3 is not wearing the seat belt, the energization time is changed from the state of the buckle switch 31 so that the energization time is optimal for the assumed state of the occupant 3. Therefore, the dark current can be further reduced without causing the passenger to feel uncomfortable.

DESCRIPTION OF SYMBOLS 1 Seat belt apparatus 5 Webbing 10 Motor 11 Rotation sensor (Seat belt state detection means)
12 Belt reel 13 Power transmission mechanism (transmission mechanism)
21 Controller (control means)
31 Buckle switch (seat belt state detection means)
32 IG state detection unit (ignition state detection means)
33 Door open / close detection unit (vehicle state detection means)
34 Battery voltage detection part (vehicle state detection means)

Claims (5)

A belt reel around which webbing is wound;
A motor for rotationally driving the belt reel;
A vehicle seat belt device comprising: a transmission mechanism for performing drive transmission between the motor and the belt reel;
An ignition state detection means for detecting an ignition state;
Control means for controlling drive of the motor;
Vehicle state detection means for detecting the state of the vehicle;
Seat belt state detection means for detecting the state of the seat belt;
The control means changes the energization time to the motor after a change from ignition on to off is detected based on the state of the vehicle or the state of the seat belt. Belt device.     The vehicle seat belt device according to claim 1, wherein the vehicle state detecting means detects an open / closed state of a door of the vehicle.   The vehicle seat belt device according to claim 1, wherein the vehicle state detection unit detects a battery voltage of the vehicle.   The vehicle seat belt device according to any one of claims 1 to 3, wherein the seat belt state detection means detects a displacement of the webbing.   The vehicle seat belt device according to any one of claims 1 to 4, wherein the seat belt state detection means detects a state of a buckle.

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