JP4706515B2 - Vehicle seat belt control device - Google Patents

Description

  The present invention relates to a vehicle seat belt control device that controls a winding tension of a seat belt provided in a driver seat or a passenger seat installed in a vehicle.

  Conventionally, for example, a seat belt device or an airbag device is mounted on a vehicle such as an automobile for the purpose of restraining an occupant during a collision. Among these, since the seat belt device always restrains the occupant even during normal traveling except during a collision, it is required to be in an accurate restrained state according to the traveling state of the vehicle. For the purpose of satisfying this requirement, Patent Document 1 discloses an example of a seat belt device capable of controlling the tension of the seat belt according to the danger level of the area or place where the host vehicle is traveling.

The seat belt device disclosed in Patent Document 1 detects the position of the host vehicle by a navigation system, and raises the tension of the seat belt in advance before a dangerous area such as a curve in an advancing direction or an intersection. Thus, it is possible to realize effective occupant restraint when the host vehicle collides.
JP 2001-10447 A

  However, in the above-described seat belt device, the position of the host vehicle is detected by the navigation system and the seat belt tension is increased in front of the dangerous area in the traveling direction, so the host vehicle actually traveled along a curve or an intersection. There is a problem in that the lateral displacement of the upper body of the occupant cannot be sufficiently maintained because the seat belt tension according to the lateral acceleration applied to the occupant cannot be generated. The lateral acceleration applied to the occupant is proportional to the turning radius of the curve and the traveling speed, and the proportional manner changes depending on the vehicle structure. Therefore, more accurate control of the seat belt tension is desired.

  Therefore, the present invention has been proposed in view of the above-described circumstances, and is for a vehicle that can control a seat belt winding tension in accordance with a lateral acceleration and suppress an occupant's body displacement. An object is to provide a seat belt control device.

  In order to solve the above-described problems, a motor that performs a seat belt winding operation and a winding release operation in a vehicle seat belt control device that controls the winding tension of a seat belt installed in a vehicle. Based on the current position information of the host vehicle and the route information of the route on which the host vehicle travels, when there is a curved road on the route of the host vehicle, the radius of the curve at the entrance of the curve road, the distance to the entrance of the curve road, Information acquisition means for acquiring the minimum curve radius of the curve road and the distance to the minimum curve radius point, and the seat belt required at the curve road entrance based on the curve radius at the curve road entrance acquired by the information acquisition means The seat bell required at the minimum curve radius point based on the minimum curve radius of the curved road acquired by the information acquisition means while calculating the winding tension The calculation means for calculating the winding tension of the vehicle, and the motor is controlled based on the distance to the curve road entrance and the distance to the minimum curve radius acquired by the information acquisition means. Specifically, a control means is provided for changing the seat belt retracting tension from the seat belt retracting tension required at the entrance of the curve road to the seat belt retracting tension required at the minimum curve radius.

  According to the vehicle seat belt control device of the present invention, when a curved road exists on the route of the host vehicle, the seat belt winding tension required at the entrance of the curved road is calculated, and the minimum curve of the curved road is calculated. The seat belt winding tension required at the minimum curve radius is calculated based on the radius, and the seat belt winding tension is calculated continuously or stepwise from the curve road entrance. Since the belt winding tension changes from the belt winding tension to the seat belt winding tension required at the minimum curve radius point, the seat belt winding tension is controlled according to the lateral acceleration, and the upper body of the occupant is displaced. Can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The present invention is applied, for example, to a vehicle seat belt apparatus configured as shown in FIG. The vehicle seat belt device is assumed to be mounted on a vehicle such as an automobile, but the type and application of the vehicle to be mounted are arbitrary, and can be widely mounted in general vehicles. For this reason, illustration of a vehicle is abbreviate | omitted.

  In this vehicle seat belt apparatus, a driver's seat 1A is provided with a seat belt retractor 11A having a motor 12A that is a driver's seat belt apparatus, and a passenger's seat 1B is provided with a motor 12B that is a passenger's seat belt apparatus. A provided seat belt retractor 11B and an occupant detection sensor 13 are provided.

  The seat belt retractor 11A and the seat belt retractor 11B are, for example, a three-point seat belt that restrains the seated driver and the occupant's waist and shoulders at three points. For example, the seat belt retractor 11A installed in the driver's seat 1A is a right shoulder restraint seat belt that restrains the driver's waist and right shoulder at the center, and the seat belt retractor 11B installed in the passenger seat 1B is The left shoulder restraint seat belt restrains the waist and the left shoulder of the occupant.

  A control device 2, which is a vehicle seat belt control device, is connected to the motor 12A and the motor 12B provided in the seat belt retractor 11A and the seat belt retractor 11B. The control device 2 acquires information on the host vehicle on which the vehicle seat belt device is mounted, and controls motor current and motor voltage supplied to the motor 12A and the motor 12B using the information on the host vehicle.

  The motor 12A and the motor 12B are connected to the seat belt retractor 11A and the seat belt retractor 11B, respectively, and are driven to rotate based on a control signal output from the control device 2, whereby each seat belt retractor 11A. Then, the seat belt retractor 11B is caused to perform a winding operation and a winding release operation. The form of the control signal may be arbitrary. For example, the motor 12A and the motor 12B may be controlled by a control signal whose current value varies, or the motor 12A and the motor 12A may be controlled by a control signal whose voltage value varies. The motor 12B may be configured to be controlled. Further, the driving power of the motor 12A and the motor 12B may be directly output from the control device 2.

  The control device 2 is connected to a steering angle sensor 3 that detects the steering angle of the vehicle and a vehicle speed sensor 4 that detects the speed of the vehicle, and a steering angle signal output from the steering angle sensor 3 and a vehicle speed sensor. On the basis of the vehicle speed signal output from 4, the vehicle determines whether or not the vehicle is turning and the turning direction when turning.

  The control device 2 is connected to a navigation system 5 that is a device that generates route information during traveling of the host vehicle. The control device 2 provides information on whether or not a curved road exists in the traveling direction route of the own vehicle as route information from the navigation system 5 every predetermined time, and when the curved road exists in the traveling direction route of the own vehicle. , Turn direction of curved road based on current position information of own vehicle and map information of own vehicle traveling direction, curve radius at curve road entrance, distance to curve road entrance, minimum curve radius of curve road, minimum curve radius concerned Get the distance to the point. The control device 2 controls the motor 12A and the motor 12B on the curved road according to the change in the route information, thereby continuously or stepwisely adjusting the seat belt retracting tension generated by the seat belt retractor 11A and the seat belt retractor 11B. Change.

  Furthermore, the control device 2 determines the seating state of the occupant from the detection signal from the occupant detection sensor 13. That is, the control device 2 inputs a signal representing the pressure distribution applied to the seating surface of the occupant from the occupant detection sensor 13. Accordingly, the control device 2 determines the occupant seated state as to whether or not turning weight (lateral acceleration) is applied in either the left or right direction in the width direction of the host vehicle. And the control apparatus 2 controls the winding tension | tensile_strength of the seatbelt of 11 A of seatbelt retractors and the seatbelt retractor 11B according to a passenger | crew seating state.

  Furthermore, the control device 2 outputs a control signal independently to the motor 12A and the motor 12B based on the restraint structure information stored in advance in the memory when the vehicle turns, thereby enabling the seat belt retractor 11A. In addition, the winding operation of the seat belt retractor 11B may be controlled independently. This restraint structure information is a structure in which the seat belt retractor 11A and the seat belt retractor 11B provided in the driver's seat 1A and the passenger seat 1B are restrained centering on either the right shoulder or the left shoulder of the driver and the occupant. This is information indicating whether there is a right shoulder restraint seat belt or a left shoulder restraint seat belt.

As shown in FIG. 2, when the host vehicle is traveling before entering the curved road turning leftward, the point X1 is a curved road entrance, and the point X2 is a minimum curve radius point. Acquire a certain thing as route information from the navigation system 5, and simultaneously obtain the distance from the own vehicle to the point X1, the distance from the own vehicle to the point X2, the curve radius of the point X1, and the minimum curve radius of the point X2. To do. Further, the control device 2 acquires the current vehicle speed from a signal from the vehicle speed sensor 4, and determines the magnitude of the lateral acceleration G estimated from the current vehicle speed,
Lateral acceleration G = ((α × vehicle speed−β) × ANGLE) /9.8 (Formula 1)
It is estimated by the following formula. In the above equation 1, α and β are constants determined by the structure such as the weight of the host vehicle, and ANGLE is a curve radius acquired from the navigation system 5 or a steering angle detected when passing through a curve road. From Equation 1, when the lateral acceleration G generated at the entrance of the curve road at the point X1 exceeds a predetermined value, it is determined that the control of the seat belt retracting tension is started by the control device 2. The lateral acceleration G for starting the control of the seat belt retracting tension is set to a value that may cause a lateral shift of the occupant of the host vehicle when the seat belt retracting tension is normal, for example, 0.3 G Degree. Thus, the control device 2 functions as an information acquisition unit that acquires information from the navigation system 5, the steering angle sensor 3, and the vehicle speed sensor 4, and a calculation unit that calculates the winding tension of the seat belt based on the information.

  According to this equation 1, the seat belt retracting tension becomes St1 in FIG. 3A, and continuously from the current seat belt retracting tension to the target seat belt retracting tension St1 over the period Tg1. Increase to. The seat belt take-up tension St1 is set as an initial value, for example, 30N. Further, the control device 2 starts from the control of the seat belt retracting tension until the set seat belt retracting tension St1 is reached. The period Tg1 is determined from the distance to the curve road entrance and the current vehicle speed. It is calculated, and is the arrival time until the host vehicle reaches the curve road entrance.

  As a result, even when lateral acceleration G is applied to the occupant of the host vehicle when reaching point X1, the seat belt retracting tension is increased without causing discomfort and inconvenience, and the occupant's upper body does not slip laterally. Such a seat belt winding tension can be used.

  In addition, when the seat belt retractor 11A and the seat belt retractor 11B are configured by a three-point seat belt, the seat is composed of the right side seat (driver's seat 1A) and the left side seat (passenger seat 1B) in the traveling direction. It is desirable to make the belt winding tension different. For example, when the route information that the turning direction of the host vehicle is a left curve is acquired by the control device 2 from the navigation system 5, the passenger of the driver seat 1A on the right side of the traveling direction is informed of the passenger seat 1B on the left side of the traveling direction. Larger lateral acceleration than passengers. Therefore, the control device 2 sets the seat belt retractor tension SR of the seat belt retractor 11A to be greater than the seat belt retractor tension SL of the seat belt retractor 11B. For example, the seat belt take-up tension SR is 60 N, and the seat belt take-up tension SL is 40 N.

  This makes it possible to maximize the winding effect of the three-point seat belt and to exhibit a winding effect with respect to the turning direction of the host vehicle, and to discomfort the seat belt with respect to a passenger who has difficulty getting on the seat side. Annoyance can be reduced. When the turning direction is the right side, the seat belt retractor tension SL of the seat belt retractor 11B is set larger than the seat belt retractor tension SR of the seat belt retractor 11A.

  Thereafter, the control device 2 acquires from the navigation system 5 the curve radius of the point X2 that the host vehicle reaches after the point X1 and the distance to the point X2, and the current vehicle speed and the curve at the point X2 From the radius, the lateral acceleration G is calculated again by the above-described equation 1, and the time until the host vehicle reaches the point X2 by the current vehicle speed is calculated. As a result, the operation of the motor 12A and the motor 12B is changed so as to change the take-up tension of the target seat belt and the generation timing of the take-up tension of the target seat belt to change the take-up tension of the seat belt. Control.

  As shown in FIG. 2, when the curve radius at the point X2 is larger than the curve radius at the point X1, and the lateral acceleration G at the point X2 is larger than the lateral acceleration G at the point X1, As shown in FIG. 3B, the control process for changing the seat belt retracting tension St1 by continuously increasing the retracting tension of the seat belt over the period Tg1 as shown in FIG. In addition, the winding tension of the target seat belt is changed to St2 higher than St1. For example, when the take-up tension of the 30N seat belt is generated at the point X1, the change is made so that the take-up tension of the 50N seat belt is generated at the point X2. Here, as a method for calculating the seat belt retracting tension based on the lateral acceleration, a calculation formula using the lateral acceleration as a parameter is prepared, and the seat belt retracting tension corresponding to the lateral acceleration is determined. For example, prepare the table you want.

  Further, when the time to reach the point X2 calculated after passing through the point X1 is earlier than the time to reach the point X2 calculated before the point X1, as shown in FIG. As described above, the generation timing of the seat belt retracting tension St2 is set earlier. For example, when the actual vehicle speed becomes higher than the vehicle speed when the time to reach the point X2 before the point X1 is calculated, the seat belt retracting tension St2 is corrected earlier by correcting the generation timing of the seat belt. Increase the belt winding tension.

  Further, when the lateral acceleration G generated at the point X2 is smaller than the lateral acceleration G generated at the point X1, the seat belt retracting tension St1 generated at the point X1 is maintained, or at the point X1. Correction is performed to reduce the seat belt retracting tension St2 when passing through the point X2 set before reaching.

  Furthermore, when the time to reach the point X2 calculated after passing through the point X1 is slower than the time to reach the point X2 calculated before the point X1, the seat belt winding tension The generation timing of St2 is set late. For example, when the actual vehicle speed is lower than the vehicle speed when the time to reach the point X2 before the point X1 is calculated, the generation timing of the seat belt retracting tension St2 is corrected later.

  When the control device 2 detects that the lateral acceleration G is generated in the occupant by the signal from the rudder angle sensor 3 until the host vehicle reaches the point X1 or the point X2, the control device 2 performs the calculation of the formula 1 again. The seat belt retracting tension corresponding to the lateral acceleration G generated by the steering is generated.

  In this way, the control device 2 controls the seat belt retracting tension according to the curve radius, the vehicle speed, and the steering angle, and generates the seat belt retracting tension corresponding to the lateral acceleration G actually applied to the occupant. be able to.

  Furthermore, when the control device 2 detects that the host vehicle travels straight on the basis of the route information from the navigation system 5 after passing through the point X2 having the minimum curve radius on the curved road, for example, the point X1 and the point X2 The seat belt winding tension generated at the point X2 is maintained until it can be determined that a lateral acceleration G smaller than the lateral acceleration G applied to the occupant is actually applied to the occupant. After that, when the lateral acceleration G actually applied to the occupant becomes a sufficiently small predetermined value (for example, 0.2 G) and the vehicle goes straight ahead, the control is made to the normal seat belt winding tension, and the processing is finished. Will do.

  Next, a processing procedure when the seat belt winding tension is controlled by the control device 2 having the above-described function will be described.

  In the control process of the seat belt winding tension, first, in step S1, the control device 2 determines whether or not there is a curved road on the route of the host vehicle. The process is started and is continued until the vehicle completes passing through the curved road and shifts to straight traveling.

  Next, in step S2, the control device 2 acquires the curve radius of the curved road detected in step S1 as the route information from the navigation system 5, and also acquires the vehicle speed signal from the vehicle speed sensor 4, The lateral acceleration G1 is calculated, and in step S3, the lateral acceleration G1 calculated in step S2 is higher than a predetermined value (for example, 0.3 G) at which the control of the seat belt winding tension on the curved road is started. Determine whether. Then, if the lateral acceleration G1 is not higher than the predetermined value, the process is terminated, and if higher, the process proceeds to step S4.

  Next, in step S4, the control device 2 calculates an arrival time T1 to the curved road point where it is estimated that the lateral acceleration G higher than the predetermined value is generated in step S3. At this time, the control device 2 calculates the arrival time T1 using the distance to the curved road point acquired from the navigation system 5 and the current vehicle speed. Next, in step S5, the control device 2 starts control for increasing the seat belt winding tension to the seat belt winding tension St1, which is the initial value continuously or stepwise over the arrival time T1.

  Next, in step S6, the control device 2 makes the curve radius smaller and steeper than the curve road entrance in which the lateral acceleration G1 is calculated in step S2 while raising the seat belt winding tension to St1. It is determined whether or not a curved road exists. If it is determined that there is no steep curve road, the process proceeds to step S12, and the control to bring the seat belt retracting tension close to St1 is continued.

  On the other hand, if it is determined in step S6 that a sharp curve road exists, the process proceeds to step S7. In step S7, the control device 2 obtains the current vehicle speed and the curve radius on the sharp curve road determined to exist in step S6 as the route information from the navigation system 5, and performs the calculation of Expression 1. Thus, the lateral acceleration G2 is calculated. Then, the control device 2 determines whether or not the lateral acceleration G2 is higher than the lateral acceleration G1 (step S8) and whether or not the lateral acceleration G2 is lower than the lateral acceleration G1 (step S9). When the lateral acceleration G2 is higher than the lateral acceleration G1, in step S10, the winding tension of the target seat belt is changed from St1 to St2, and the process proceeds to step S12, and the lateral acceleration G2 becomes the lateral acceleration G1. If lower, in step S11, the winding tension of the target seat belt is changed to St3 lower than St1, and the process proceeds to step S12. Here, as a scene where the lateral acceleration G2 becomes smaller than the lateral acceleration G1 even on a steep curve road, there is a scene where the current vehicle speed becomes lower and the lateral acceleration actually applied to the occupant becomes smaller. .

  Next, in step S12, the control device 2 acquires the latest vehicle speed from the vehicle speed sensor 4 and arrives at the curve road at the point where the seat belt winding tension changed in step S10 or step S11 is generated. In step S13, it is determined whether or not the arrival time T2 and the arrival time T1 are the same. If it is determined that the arrival time T1 and the arrival time T2 are the same and the arrival time up to the radius of the minimum curve radius has not changed, the process proceeds to step S15 as it is, and the arrival time T1 and the arrival time T2 Are not the same and the arrival time to the point of the minimum curve radius has changed, the arrival time T1 until the minimum seat belt retracting tension (target value) is generated in step S14 is set to the latest arrival time. After changing to time T2, the process proceeds to step S15.

  Further, in step S15, the control device 2 acquires the steering steering angle from the steering angle sensor 3 and the vehicle speed from the vehicle speed sensor 4, and calculates the lateral acceleration G3 generated in the host vehicle by the steering steering angle and the vehicle speed. . At this time, the control device 2 calculates the new lateral acceleration by substituting the latest vehicle speed and steering angle into the above-mentioned equation 1. Next, in step S16, the control device 2 compares the lateral acceleration G3 with the lateral acceleration G1 and the lateral acceleration G2, and determines whether the lateral acceleration G3 is the lateral acceleration G1 or the lateral acceleration G2. It is determined whether it is smaller than. When it is determined that the lateral acceleration G3 is smaller than the lateral acceleration G1 or the lateral acceleration G2, the control device 2 does not increase the lateral acceleration of the host vehicle depending on the steering steering angle. The process proceeds to step S19 without changing the winding tension.

  On the other hand, if the control device 2 determines that the lateral acceleration G3 is not smaller than the lateral acceleration G1 or the lateral acceleration G2, the control device 2 advances the process to step S17 to set the target seat belt retracting tension. Is changed to the seat belt retracting tension St4 corresponding to the lateral acceleration actually generated depending on the steering angle and the vehicle speed. The seat belt retracting tension St4 is higher than the seat belt retracting tension St1 when the lateral acceleration G1 is generated and the seat belt retracting tension St2 when the lateral acceleration G2 is generated. Further, after changing the target to the seat belt retracting tension St4, the control device 2 changes the arrival time to the minimum value in step S18 and immediately generates the target seat belt retracting tension St4. Then, the process proceeds to step S19.

  Next, in step S19, the control device 2 determines whether or not the host vehicle has gone straight through the curved road because the route information from the navigation system 5 or the lateral acceleration has decreased, and goes straight. If it is determined that the vehicle is not traveling, the process returns to step S12. If it is determined that the vehicle is traveling straight, the process proceeds to step S20, and the control of the seat belt winding tension is terminated.

  Such a vehicle seat belt device starts the control of the seat belt retracting tension when detecting a curved road in which a lateral displacement of the occupant occurs due to lateral acceleration, and the radius, vehicle speed, steering of the curved road When the actual lateral acceleration changes depending on the steering angle, it can be changed to the seat belt retracting tension corresponding to the actual lateral acceleration. Further, it is possible to change the time required to reach the target seat belt retracting tension by changing the arrival time until the change in the lateral acceleration actually occurs. Accordingly, the lateral tension of the occupant's upper body can be suppressed by controlling the winding tension of the seat belt corresponding to the lateral acceleration actually felt by the occupant.

  Further, according to this vehicle seat belt device, the seat belt retracting tension can be controlled in accordance with the lateral acceleration actually applied to the occupant, so that the lateral tension applied to the passenger seated in the passenger seat 1B and the rear seat in particular. The lateral shift with respect to the direction acceleration can be effectively suppressed. In other words, the driver can predict and determine the next behavior of the vehicle because he / she is driving the vehicle, and the upper body is always supported by steering, so that the actual lateral acceleration can be predicted and dealt with. However, the passenger seated in the front passenger seat and the rear seat is less likely to support the upper body and is therefore easily affected by lateral acceleration. Thus, by adjusting the winding tension of the seat belt according to the actual lateral acceleration, it is possible to effectively suppress the lateral shift without giving bothersomeness and uncomfortable feeling. In addition, if all seats are set to a seat belt retracting tension that does not bother the passengers and feel uncomfortable, there is a possibility that sufficient occupant restraint effects may not be achieved in the event of a collision. Since the seat belt winding tension can be changed immediately by changing the steering angle, a sufficient occupant restraint effect can be realized even when the lateral acceleration is suddenly increased.

  Further, although not included in the seat belt winding control process shown in FIG. 4, pressure distribution information is obtained from a signal from the occupant detection sensor 13 as information for actually estimating the lateral acceleration applied to the occupant. Even if the seat belt retracting tension is controlled from the seated state of the occupant, the seat belt retracting tension can be further controlled in accordance with the actual lateral acceleration. At this time, the control device 2 compares the lateral acceleration obtained from the curve radius and the vehicle speed with the lateral acceleration that can be estimated from the pressure distribution information, and the lateral acceleration that can be estimated from the pressure distribution information is greater. Increases the seat belt retracting tension, and maintains or decreases the current seat belt retracting tension when the lateral acceleration that can be estimated from the pressure distribution information is smaller. As a result, the lateral displacement of the upper body due to the lateral acceleration actually received by the occupant can be efficiently and effectively maintained.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

  That is, in the above-described embodiment, referring to FIG. 1 and the like, the motor 12A built in the seat belt retractor 11A of the driver seat 1A and the motor 12B built in the seat belt retractor 11B of the passenger seat 1B are controlled, Although the example which controls the winding tension | tensile_strength of each seatbelt of driver's seat 1A and front passenger's seat 1B was demonstrated, it is not restricted to this, When it is a vehicle which installed the seatbelt retractor provided with the motor in the front seat center or the backseat Therefore, it is possible to control the take-up tension of the seat belts in these seats by the control device 2 without increasing the number of sensors only by increasing the number of motors to be controlled.

It is a block diagram which shows the structure of the vehicle seatbelt apparatus containing the control apparatus to which this invention is applied. It is a figure for demonstrating the process which calculates a horizontal direction acceleration by the route information from a navigation system at the time of the left turn of a vehicle. (A) is a figure explaining the change of the winding tension of a seatbelt at the time of the start of control of the winding tension of a seatbelt, (b) is control of the winding tension of a seatbelt by the change of lateral acceleration. It is a figure explaining the process which changes. It is a flowchart which shows the process sequence of the control process of the winding tension of a seatbelt by the control apparatus to which this invention is applied.

Explanation of symbols

1A Driver's seat 1B Passenger's seat 2 Control device 3 Rudder angle sensor 4 Vehicle speed sensor 5 Navigation system 11A, 11B Seat belt retractor 12A, 12B Motor 13 Crew detection sensor

Claims (4)

In a vehicle seat belt control device for controlling the winding tension of a seat belt installed in a vehicle,
A motor that performs a winding operation and a winding release operation of the seat belt;
Based on the current position information of the host vehicle and the route information of the route on which the host vehicle travels, if there is a curved road on the route of the host vehicle, the curve radius at the entrance of the curved road, the distance to the entrance of the curved road, the curve Information acquisition means for acquiring the minimum curve radius of the road and the distance to the minimum curve radius point;
Based on the curve radius at the curve road entrance acquired by the information acquisition means, the seat belt winding tension required at the curve road entrance is calculated, and based on the minimum curve radius of the curve road acquired by the information acquisition means Calculating means for calculating the seat belt winding tension required at the minimum curve radius point;
By controlling the motor based on the distance to the curve road entrance and the distance to the minimum curve radius acquired by the information acquisition means, the winding tension of the seat belt is continuously or stepwise from the curve road entrance. And a control means for changing the seat belt winding tension required at the minimum curve radius point from the seat belt winding tension required at the entrance to the curve road. Belt control device. The information acquisition means acquires a change in lateral acceleration of the host vehicle based on a change in travel speed and steering angle of the host vehicle,
2. The vehicle seat belt control device according to claim 1, wherein the control unit corrects the seat belt winding tension calculated by the calculation unit to change the seat belt winding tension. 3. The information acquisition means acquires pressure distribution information on the seating surface of the occupant,
The control means estimates lateral acceleration applied to the occupant based on the pressure distribution information acquired by the information acquisition means, corrects the seat belt winding tension calculated by the calculation means, and The vehicle seat belt control device according to claim 1, wherein a belt winding tension is controlled. The seat belt comprises storage means for storing restraint structure information indicating which of the right shoulder and the left shoulder of the vehicle occupant is restrained around the center,
The information acquisition means acquires the turning direction of the curved road entrance from the navigation system of the host vehicle,
The control unit restrains the motor around the right shoulder by controlling the motor based on the turning direction acquired by the information acquisition unit and the constraint structure information stored in the storage unit when the vehicle turns. The seat belt retracting tension generated by the right shoulder restraining seat belt having the structure and the seat belt retracting tension generated by the left shoulder restraining seat belt having the structure restraining around the left shoulder are independently controlled. The vehicle seat belt control device according to any one of claims 1 to 3, characterized in that:

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