JP2008296674A - Vehicle seat belt device - Google Patents

Abstract

An object of the present invention is to accurately remove a seat belt according to a driving state, to surely protect and restrain an occupant, and to maintain a comfortable driving environment.
Detected by a belt reel 22 around which a belt 13 is wound, a rotational position detecting means 25 for detecting the rotational position of the belt reel 22, a motor 23 for rotationally driving the belt reel 22, and a rotational position detecting means 25. A controller 26 having a slack removal mode in which the belt reel 22 is rotationally driven to remove the slack of the belt 13 by controlling the energization amount to the motor 23 based on the rotated position. In addition, a reverse operation detecting means 31 for detecting the reverse operation of the vehicle is provided, and the slack removal mode is invalidated during the reverse operation of the vehicle.
[Selection] Figure 4

Description

  The present invention relates to a seatbelt device for a vehicle that takes in information such as a change in driving posture according to a vehicle condition and removes slack in a seatbelt according to a change in driving posture.

2. Description of the Related Art As a seat belt device for a vehicle, a device that controls the tension of a seat belt and restrains an occupant in an emergency or when a running state is unstable is known.
In this type of vehicle seat belt device, information such as an acceleration sensor and a wheel speed sensor is taken into a control unit of the seat belt device, and the tension of the seat belt is controlled by the control unit.

As such a seat belt device for a vehicle, there is known a device that adjusts a pull-out amount of the seat belt in accordance with the occupant's physique, weight, and the like so that the seat belt is in close contact with the occupant (for example, see Patent Document 1). .
Japanese Patent Laying-Open No. 2005-263041 (page 6, FIG. 2)

An outline of the technique of Patent Document 1 will be described with reference to FIG.
FIG. 5 is a diagram illustrating a basic configuration of a conventional vehicle seat belt apparatus.
A conventional vehicle seat belt device 210 can detect a seat belt 211 that restrains an occupant to a seat, a motor (seat belt actuator) 212 that winds or pulls out the seat belt 211, and a pull-out amount of the seat belt 211. Rotary encoder (seat belt withdrawal amount detection device) 213, occupant detection device 214 for determining the occupant state on the seat, seat belt withdrawal amount information transmitted from the rotary encoder 213, and occupant transmitted from the occupant detection device 214 Based on the information, it is determined whether or not the pull-out amount of the seat belt 211 for the occupant is appropriate. If it is determined that the pull-out amount is not appropriate, the motor 212 is driven to adjust the pull-out amount of the seat belt 211. And seat belts according to the physique, weight, etc. Adjust withdrawn amount of 11, it is obtained so as to contact the seat belt 211 to the occupant.

However, since the seat belt device 210 of the vehicle adjusts the pull-out amount of the seat belt 211 according to the occupant's physique, weight, etc., so that the seat belt 211 is in close contact with the occupant, for example, during a garage operation, In some cases, the belt 211 is in close contact with the occupant (driver) and the garage entry operation is difficult.
In other words, the seat belt device 210 of the vehicle does not adjust the pull-out amount of the seat belt 211 according to the driving situation, and therefore there are cases where a comfortable driving environment cannot be maintained.

  It is an object of the present invention to provide a seat belt device for a vehicle capable of accurately removing slack of a seat belt according to a driving state, reliably protecting a passenger, and maintaining a comfortable driving environment. To do.

  According to the first aspect of the present invention, a belt reel around which a belt is wound, a rotational position detecting means for detecting the rotational position of the belt reel, a motor for rotationally driving the belt reel, and a rotation detected by the rotational position detecting means. A vehicle seat belt device comprising: a control unit having a slack removal mode for rotationally driving a belt reel to remove a slack in a belt by controlling an energization amount to a motor based on a position; The unit has a reverse operation detecting means for detecting a reverse operation of the vehicle, and invalidates the slack removal mode when the vehicle is reversely operated.

In the invention according to claim 1, a belt reel around which a belt is wound around a seat belt device of a vehicle, a rotational position detecting means for detecting a rotational position of the belt reel, a motor for rotationally driving the belt reel, and a rotational position And a controller having a slack removal mode in which the belt reel is driven to rotate to remove the slack of the belt by controlling the energization amount to the motor based on the rotational position detected by the detecting means.
The control unit includes a reverse operation detection unit that detects a reverse operation of the vehicle, and is configured to invalidate the slack removal mode during the reverse operation of the vehicle. As a result, it is possible to avoid the belt from being wound, particularly during the backward operation of the vehicle such as garage entry, and the operation such as garage entry is facilitated. As a result, it is possible to improve the convenience of the occupant (driver) while ensuring the original function of the belt (seat belt).

DESCRIPTION OF EMBODIMENTS Preferred embodiments (examples) of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a side view showing a mounted state of a seat belt device for a vehicle according to the present invention. FIG. 2 is a diagram showing a main configuration and a control unit of the retractor of the seat belt device shown in FIG.

  In FIG. 1, a vehicle seat belt device 10 includes a belt (webbing) 13 that restrains the body of an occupant 11 to a seat (vehicle 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.

  Further, as shown in FIG. 2, the vehicle seat belt device 10 includes a control unit 26 that controls the energization amount of the motor 23 via a motor drive unit (energization adjustment unit) 28, and the control unit 26 includes: A reverse operation detecting means 31 is provided for detecting a reverse operation of the vehicle.

  FIG. 2 shows a main configuration of the seat belt retractor 16. The retractor 16 is rotatably provided in the housing 21 and includes a belt reel (spindle) 22 around which the belt 13 is wound 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. In addition, the retractor 16 includes a rotation position detection means (rotation detection unit) 25 connected to the shaft 22 a of the belt reel 22.

  The rotational position detecting means 25 is preferably configured using a rotational 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 rotational position detection means 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 rotational position detection means 25 are input to the control unit (control means) 26 as shown in FIG. The control unit 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.

  The control unit 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 motor drive unit (energization amount adjusting unit) 28. The retractor 16 controlled by the control unit 26 is configured as an electric pretensioner for maintaining the position and posture of the occupant 11. That is, the belt reel 22, the motor 23, and the power transmission mechanism 24 constitute an electric pretensioner.

In the control unit 26, the belt reel 22 is rotationally driven to remove the slack of the belt 13 by controlling the energization amount to the motor 23 based on the rotational position detected by the rotational position detection means 25. That is, a slack removal mode for removing slack of the belt 13 is provided.
In addition, the control unit 26 includes a reverse operation detection unit 31 that detects a reverse operation of the vehicle, and invalidates the slack removal mode when the vehicle is reversely operated.

FIGS. 3A and 3B are diagrams for explaining detection of a reverse operation of the seat belt device of the vehicle shown in FIG.
In (a), the attitude | position of the passenger | crew 11 in normal driving | running | working is shown and it is thought that the seat back 12a of the seat 12 and a passenger | crew's back have a moderate clearance gap.

  In (b), an example of the attitude | position of the passenger | crew (driver | operator) 11 in reverse operation is shown. For example, during a backward operation such as entering a garage, the occupant (driver) 11 often turns around, so that it may be in close contact with the seat bag 12a of the seat 12 as indicated by an arrow a1. At this time, if the slack removal mode of the seat belt device 10 of the vehicle is activated, the occupant 11 is pressed against the seat back 12a, and the garage entry operation may be difficult, so the control unit 26 (see FIG. 2). ), The backward operation detecting means 31 detects the backward operation of the vehicle, and the slack removal mode is invalidated during the backward operation of the vehicle.

  The reverse operation detection means 31 is a means for detecting that the occupant 11 is performing a reverse operation. Examples of the reverse operation detection means 31 include the following.

  As a first example, an occupant detection sensor (occupant posture detection system) that uses a pressure-sensitive film or the like is provided in the seat bag of the seat so that it can be twisted to the right rear or left rear in order to gaze directly at the rear. Detects the backward operation by detecting the posture. As a second example, a CCD (charge coupled device) camera is provided in the vehicle interior, and in order to gaze directly at the rear, a posture that twists to the right rear or left rear is detected from the camera image to detect the backward operation. . As a third example, a method of detecting a reverse operation directly from the selected position of the shift lever can be considered. Furthermore, the first to third examples can be used in appropriate combination.

FIG. 4 is a flowchart showing the control of the vehicle seat belt apparatus according to the present invention (see FIGS. 1 and 2 for reference numerals). STXX indicates a step number.
ST01: It is determined whether or not the buckle switch 19 is turned on. On the condition that the buckle switch 19 is turned on, when the belt 13 is slack, a slack removal mode for removing the slack of the belt 13 is started. That is, if YES, the process proceeds to ST02, and if NO, ST01 is repeated.

    ST02: From the change in the rotation angle of the belt reel 22 detected by the rotation position detection means 25, it is determined whether or not the belt (seat belt) 13 has been displaced. If YES, the process proceeds to ST03, and if NO, the process returns to ST01.

ST03: The reverse operation detecting means 31 detects whether the reverse operation is being performed, and determines whether the reverse operation is being performed. If YES, the process proceeds to ST04, and if NO, the process proceeds to ST05.
ST04: The slack removal mode is disabled and the slack removal control is stopped.
ST05: The slack removal control is executed with the slack removal mode enabled.

  That is, the control unit 26 is provided with the reverse operation detection means 31 for detecting the reverse operation of the vehicle, and the slack removal mode is invalidated at the time of the reverse operation of the vehicle. It is possible to avoid the belt (seat belt) 13 from being wound up, and it is easy to perform operations such as garage entry. As a result, it is possible to improve the convenience of the occupant (driver) 11 while securing the original function of the belt (seat belt) 13.

  The vehicle seat belt device according to the present invention is suitable for use in passenger cars such as sedans and wagons.

It is a side view which shows the mounting state of the seatbelt apparatus of the vehicle which concerns on this invention. It is a figure which shows the principal part structure and control part of the retractor of the seatbelt apparatus shown in FIG. It is a figure explaining the detection of reverse operation of the seatbelt apparatus of the vehicle shown by FIG. It is a flowchart which shows control of the seatbelt apparatus of the vehicle which concerns on this invention. It is a figure explaining the basic composition of the conventional seatbelt apparatus of vehicles.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle seat belt apparatus, 13 ... Belt (seat belt), 22 ... Belt seal, 23 ... Motor, 25 ... Rotation position detection means, 26 ... Control part, 31 ... Reverse operation means

Claims (1)

A belt reel around which a belt is wound, a rotational position detecting means for detecting the rotational position of the belt reel, a motor for rotationally driving the belt reel, and the motor based on the rotational position detected by the rotational position detecting means. A vehicle seat belt device comprising: a control unit having a slack removal mode for driving the belt reel to remove the slack of the belt by controlling an energization amount to
The said control part has a reverse operation detection means which detects reverse operation of the said vehicle, The said sieve removal apparatus invalidates the said slack removal mode at the time of reverse operation of the said vehicle.

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