JP2014231342A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device capable of performing holding control of a seat belt which further suits sensitivity of a seating person without giving discomfort and unpleasantness to the seating person who is driving.SOLUTION: A control device 10 performs holding control of a seat belt 4 when acceleration detected by an acceleration detection unit 22 is equal to or more than a predetermined value, and during the holding control of the seat belt 4, when speed detected by a vehicle speed detection unit 21 is increasing and a steering angle detected by a steering angle detection unit 23 is a constant angle in turning, the holding control of the seat belt 4 is continued.

Description

  The present invention relates to a seat belt device.

  For example, as shown in FIG. 4, the lateral acceleration (lateral G) applied to the occupant increases as the turning radius (corner radius) of the curve and the traveling speed [km / h] increase. And since the proportional method differs depending on the vehicle structure, more precise tension control of the seat belt is desired. For this reason, Patent Document 1 introduces a technology related to a vehicle seat belt control device that can control a seat belt winding tension in accordance with the lateral G to suppress an occupant state shift.

JP 2007-245877 A

  According to the technique disclosed in Patent Document 1, the control unit calculates the winding tension of the seat belt required at the minimum curve radius point based on the minimum curve radius of the curved road acquired from the route information, By controlling the motor based on the distance to the curve road entrance and the distance to the minimum radius point, the upper body of the occupant can be controlled by changing the seat belt winding tension continuously or stepwise from the curve road entrance. Suppresses the deviation.

  However, according to the technique disclosed in Patent Document 1, once the minimum radius of the curved road is determined, the seat belt winding tension is fixed without considering the traveling vehicle speed. When the vehicle is traveling while accelerating the corner with the intention of the above, there is a possibility that the vehicle is restrained by the seat belt. In this case, an uncomfortable or uncomfortable feeling is given to the occupant during driving.

  The present invention has been made to solve the above-described problems, and provides a seat belt device capable of holding and controlling a seat belt that is more sensitive to the occupant without giving the driver an uncomfortable feeling or discomfort. The purpose is to provide.

  According to a first aspect of the present invention, there is provided a vehicle speed detection unit that detects a vehicle speed, an acceleration detection unit that detects an acceleration of the vehicle, a steering angle detection unit that detects a steering angle of the vehicle, and the acceleration detection unit. When the detected acceleration is equal to or greater than a predetermined value, the seat belt is controlled to be held, and during the holding control of the seat belt, the speed detected by the vehicle speed detector is increasing, and the steering angle detector And a control unit that performs control so as to continue holding control of the seat belt while the detected steering angle is turning at a constant angle.

  According to a second aspect of the present invention, in the seat belt device according to the first aspect, the control unit is configured such that the steering angle detected by the steering angle detection unit during the holding control of the seat belt is equal to or greater than the predetermined angle. In this case, the seat belt is controlled so that the winding tension of the seat belt is increased compared to the winding tension when the seat belt is being controlled.

  According to a third aspect of the present invention, in the seat belt device according to the first aspect, the control unit is configured to determine the vehicle behavior based on the vehicle speed detected by the vehicle speed detection unit or the steering angle detected by the steering angle detection unit. Is controlled so that the winding tension of the seat belt when it indicates sudden deceleration or sudden turning is increased compared to the winding tension during the holding control of the seat belt.

  ADVANTAGE OF THE INVENTION According to this invention, the seatbelt apparatus which can perform holding | maintenance control of the seatbelt more suitable for a passenger | crew without giving discomfort and discomfort to the passenger | crew during driving | operation can be provided.

It is a hardware block diagram of the seatbelt apparatus by embodiment of this invention. It is a block diagram which shows the internal structure of the electrical equipment system of the seatbelt apparatus which concerns on embodiment of this invention. It is a flowchart which shows operation | movement of the seatbelt apparatus which concerns on embodiment of this invention. It is the graph which showed the relationship between the horizontal direction acceleration and speed for every corner radius.

  Hereinafter, a seat belt device according to an embodiment of the present invention (hereinafter simply referred to as the present embodiment) will be described in detail with reference to the drawings.

(Configuration of the embodiment)
The seat belt device 1 according to the present embodiment is applied to a so-called three-point seat belt capable of restraining an occupant seated on a seat 2 as shown in FIG. In the seat belt device 1, a seat belt 4 is pulled upward from a retractor 3 attached to a center pillar (not shown), and the seat belt 4 is inserted into a through anchor 5 supported on the upper side of the center pillar. The front end of the seat belt 4 is fixed to the vehicle body floor via an outer anchor 6 on the outside of the passenger compartment of the seat seat 2.

  A tongue plate 7 is inserted between the through anchor 5 and the outer anchor 6 of the seat belt 4, and the tongue plate 7 is attached to and detached from the buckle 8 fixed to the vehicle body floor of the seat belt 4 near the vehicle body. It is possible. The buckle 8 includes a buckle switch (not shown). The buckle switch is turned on when the tongue plate 7 is engaged with the buckle 8 and turned off when the tongue plate 7 is detached from the buckle 8. Become.

  The seat belt 4 is configured to be retractable by a spring (not shown) and a motor (FIG. 30) that constitute the retractor 3. In the retractor 3, the seat belt 4 is wound around a belt reel 11 rotatably supported by a casing, and a speed reducer including a planetary gear is engaged with the shaft of the belt reel 11 protruding to one end side of the casing. ing. On the other hand, a power transmission device composed of a plurality of gear groups is connected to the output shaft of the motor 30 (FIG. 2), and the power transmission device and the speed reducer are linked via a clutch so as to be connected and disconnected. A spring is engaged with the shaft of the belt reel 11 protruding into the spring case from the other end of the casing, and the belt reel is urged in the winding direction by this spring. In some cases, the retractor 3 is configured by only the motor 30.

  The seat belt 4 is wound around the belt reel 11 in an initial state, and the occupant mainly pulls out the chest plate and abdomen from the seat seat 2 by pulling it out by hand and fixing the tongue plate 7 to the buckle 8. to bound. Further, when the occupant releases the buckle 8 and removes the tongue plate 7 from the buckle 8, the buckle switch is turned off, and the seat belt 4 is wound around the belt reel by the spring and the motor 30 (FIG. 2) and is moved to the retractor 3. Stored. Further, in the seat belt device 1, the emergency retracting (pre-tensioning) of the seat belt 4 by the motor 30 (FIG. 2) is performed in an emergency such as a collision, and the restraining effect on the occupant is strengthened.

  The control device 10 controls the winding operation of the belt 4 by the retractor 3 by obtaining necessary power from a power source (not shown) and energizing the motor (30 in FIG. 2). A seat belt device 1 including a retractor 3 and a control device 10 having the same configuration is disposed in each seat of the driver's seat and the passenger seat of the vehicle. Here, only the seat belt on the driver's seat side where the occupant operates the steering handle 9 is shown.

  FIG. 2 shows an internal configuration of the electrical system of the seat belt device 1 including the control device 10 according to the present embodiment. As shown in FIG. 2, the seat belt device 1 according to the present embodiment includes a control device 10, a vehicle speed detection unit 21, an acceleration detection unit 22, and a steering angle detection unit 23. (Controller Area Network) Connected to the control device 10 via the bus 20.

  The control device 10 controls the holding of the seat belt 4 when the acceleration detected by the acceleration detecting unit 22 is equal to or greater than a predetermined value. During the holding control of the seat belt 4, the speed detected by the vehicle speed detecting unit 21 is increasing. In addition, while the steering angle detected by the steering angle detector 23 is turning at a constant angle, the seat belt 4 is controlled so as to continue the holding control. Further, the control device 10 determines the winding tension of the seat belt 3 when the steering angle detected by the steering angle detection unit 23 changes to a certain angle or more during the holding control of the seat belt 4. You may control the electric current value output to the motor 30 so that it may become strong compared with the winding tension in the case of holding control.

  The control device 10 also winds the seat belt 4 when the vehicle behavior indicates sudden deceleration or sudden turning by the vehicle speed detected by the vehicle speed detection unit 21 or the steering angle detected by the steering angle detection unit 23. The current value output to the motor 30 may be controlled so that the take-up tension becomes stronger than the take-up tension during the holding control of the seat belt 4.

  Note that the seat belt holding control refers to the energization control of the motor 30 so as to hold the rotation position (winding position) of the belt reel 11 detected by the rotation angle sensor 13 at the reference restraint position during normal travel. To do. The reference restraint position is an average rotational position of the belt reel 11 during normal travel (sampled a plurality of times and the sum of the sampling values divided by the number of samplings) or a small amount in the winding direction from the rotational position. The rotation position is the rotated position.

  For this reason, the control device 10 includes a main control unit 11 and a motor drive control unit 12. The main control unit 11 is constituted by, for example, a microprocessor including a memory, and the seat belt 4 when the acceleration detected by the acceleration detection unit 22 is equal to or greater than a predetermined value based on a program recorded in the memory. During the holding control of the seat belt 4, while the speed detected by the vehicle speed detecting unit 21 is increasing and the steering angle detected by the steering angle detecting unit 23 is turning at a constant angle, The motor drive control unit 12 is controlled so as to continue the holding control of the seat belt 4.

  When the motor drive control unit 12 receives a motor drive request, a motor reverse rotation request, or a motor stop request from the main control unit 11, the motor drive control unit 12 drives the motor 30 of the seat belt retractor 3 to perform the reverse rotation or stop control. . The motor drive control unit 12 is configured by, for example, a three-phase bridge circuit. The motor drive control unit 12 is configured by a three-phase bridge circuit including, for example, six FETs (Field Effect Transistors). Note that the three-phase bridge circuit may be configured by a plurality of switching transistors such as an IGBT (Insulated Gate Bipolar Transistor), for example, without using an FET. The FET drives and controls the motor 30 by generating U-phase, V-phase, and W-phase currents of the motor 30.

(Operation of the embodiment)
Hereinafter, the operation of the seat belt apparatus 1 according to the present embodiment shown in FIG. 2 will be described in detail with reference to the flowchart of FIG. 3.

  The control device 10 starts to operate when an ignition switch (not shown) is turned on. First, information on the vehicle speed, acceleration, and steering angle detected by the vehicle speed detection unit 21, the acceleration detection unit 22, and the steering angle detection unit 23 is displayed on the CAN bus. Get via 20. Then, the main control unit 11 determines whether the combined acceleration of the vehicle vertical G and horizontal G detected by the acceleration detection unit 22 is 0.4 g or more (step S101).

  If it is determined that there is 0.4 g or more (step S101 “YES”), the main control unit 11 controls the motor drive control unit 12 to wind the seat belt 4 detected by the rotation angle sensor 13. Adjust so that the position becomes the reference restraint position. That is, energization control for the motor 30 is performed via the motor drive control unit 12, and a drive current of, for example, about 1 [mA] is supplied (step S102).

  Subsequently, the main controller 11 determines whether or not the vehicle speed detected by the vehicle speed detector 21 is higher than the previously acquired vehicle speed (step S103). Here, if it is determined that the vehicle speed is increasing (step S103 “YES”), the main control unit 11 determines that the steering angle detected by the steering angle detection unit 23 is −10 [deg] to 10 [deg]. It is determined whether it is within the range (step S104).

  Here, if it is determined that the rudder angle is within a range of −10 [deg] to 10 [deg] (step S104 “YES”), the main control unit 11 causes the current to flow to the motor 30 in step S102. The holding control of the seat belt 4 is performed based on the value (step S105). Subsequently, the main control unit 11 determines whether the combined G of the vertical G0 and the horizontal G detected by the acceleration detection unit 22 is less than 0.24 g. (Step S106). Here, if it is determined that the weight is less than 0.4 g (step S106 “YES”), the main control unit 11 outputs a reverse rotation request to the motor drive control unit 12, and the motor drive control unit 12 receives the request. Controls the reverse rotation of the motor 30 of the retractor 3 to pull out the seat belt 4 (step S107), and stops the motor 30 when the predetermined amount of pull-out is reached (step S108).

  That is, the main control unit 11 controls the holding of the seat belt 4 when the acceleration detected by the acceleration detecting unit 22 is equal to or greater than a predetermined value (0.4 g), and the vehicle speed detecting unit 21 controls the holding of the seat belt 4 during the holding control. Control is performed so that the holding control of the seat belt 4 is continued while the detected speed is increasing and the steering angle detected by the steering angle detector 23 is turning at a constant angle (± 10 deg range). doing.

  Note that if the vehicle G determination process in step S106 determines that the vehicle G is not less than 0.24 (step S106 "No"), the main control unit 11 returns to the execution of the holding control in step S102.

  On the other hand, if it is determined in the steering angle determination process in step S104 that the steering angle detected by the steering angle detection sensor 23 is not within the range of ± 10 [deg] (step S104 “NO”), the main control unit 11 Then, the motor drive control unit 12 is controlled to increase the energization amount for the motor 30. Here, for example, the energization control of the motor 30 is performed until the current value is 3 [A] or more (step S110 “NO”), and the seat belt 4 is loosened. When the driving current becomes 3 [A] or more (step S110 “YES”), the driving current is maintained and the holding control by the seat belt 4 is performed (step S105).

  That is, the main control unit 11 determines the take-up tension of the seat belt 4 when the steering angle detected by the steering angle detection unit 23 changes to a certain angle (rapid steering) or more during holding control of the seat belt 4. The seat belt 4 is controlled to be stronger than the winding tension during the holding control of the seat belt 4. The same applies to sudden deceleration.

  If it is determined in the vehicle speed increase determination process in step S103 that the vehicle speed detected by the vehicle speed detection unit 21 has not increased (step S103 “NO”), the main control unit 11 further performs rapid deceleration or rapid rotation. A rudder is detected (step S111). The sudden deceleration is determined by comparing the speed change per hour with the vehicle speed threshold, and the sudden turning is determined by comparing the steering angle change per hour and the steering angle threshold. Here, if it is determined that there is sudden deceleration or sudden steering (step S111 “YES”), the main control unit 11 controls the motor drive control unit 12 to increase the energization amount to the motor 30. Here, for example, the energization control is performed until the maximum restraining current of 10 [A] is reached (step S113 “YES”), and the seat belt 4 is wound up to the target position (step S112). Proceed to the determination process.

  That is, the main control unit 11 determines whether the seat belt 4 has a sudden deceleration or a sudden turning by the vehicle speed detected by the vehicle speed detection unit 21 or the steering angle detected by the steering angle detection unit 23. The take-up tension is controlled to be higher than the take-up tension during the holding control of the seat belt 4.

(Effect of embodiment)
As described above, according to the seatbelt device 1 according to the present embodiment, the control device 10 holds and controls the seatbelt 4 when the acceleration detected by the acceleration detection unit 22 is equal to or greater than a predetermined value. The holding control of the seat belt 4 is continued while the speed detected by the vehicle speed detector 21 is increasing and the steering angle detected by the steering angle detector 23 is turning at a constant angle. Control to do. Therefore, when a certain acceleration or more is generated in the host vehicle, the traveling state of the vehicle such as the speed and the steering angle can be reflected in the winding control of the seat belt 4. For this reason, for example, when driving while accelerating the corner at the will of the occupant, the same seat belt holding control as before entering the corner is continued, so the occupant who is driving is uncomfortable or uncomfortable. Therefore, the seat belt 4 can be held and controlled more appropriately for the passenger.

  Further, according to the seatbelt device 1 according to the present embodiment, the control device 10 is in the case where the steering angle detected by the steering angle detector 23 changes to a certain angle or more during the holding control of the seatbelt 4. Control is performed so that the winding tension of the seat belt 4 is made stronger than the winding tension during the holding control of the seat belt 4. Further, according to the seat belt device of the present embodiment, the control device 10 causes the vehicle behavior to rapidly decelerate or decelerate according to the vehicle speed detected by the vehicle speed detection unit 21 or the steering angle detected by the steering angle detection unit 23. Control is performed so that the winding tension of the seat belt 4 in the case of sudden steering is increased as compared with the winding tension during the holding control of the seat belt 4. For this reason, when the occupant intentionally generates the vehicle G, the restraint force by the seat belt 4 can be reliably increased, and the restraint performance of the seat belt 4 can be improved.

  DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus, 3 ... Retractor, 4 ... Seat belt, 10 ... Control apparatus, 11 ... Main control part, 12 ... Motor drive control part, 13 ... Rotation angle sensor, 20 ... CAN bus, 21 ... Vehicle speed detection part, 22 ... Acceleration detector, 23 ... Steering angle detector, 30 ... Motor

Claims (3)

A vehicle speed detector for detecting the speed of the vehicle;
An acceleration detector for detecting the acceleration of the vehicle;
A steering angle detector for detecting a steering angle of the vehicle;
When the acceleration detected by the acceleration detection unit is greater than or equal to a predetermined value, the seat belt is held and controlled, while the seat belt is being held and controlled, the speed detected by the vehicle speed detection unit is increasing, and A control unit for controlling the seat belt holding control to continue while the steering angle detected by the steering angle detection unit is turning at a constant angle;
A seat belt device comprising: The controller is
When the seat belt is in the holding control, the winding tension of the seat belt when the steering angle detected by the steering angle detecting unit is changed to the predetermined angle or more during the holding control of the seat belt. 2. The seat belt device according to claim 1, wherein the seat belt device is controlled to be stronger than the take-up tension. The controller is
The seat belt retracting tension when the vehicle behavior is suddenly decelerated or steered by the vehicle speed detected by the vehicle speed detecting unit or the steering angle detected by the steering angle detecting unit. 3. The seat belt device according to claim 1, wherein the seat belt device is controlled so as to be stronger than a winding tension during belt holding control.

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