JP2009234536A - Vehicular seat belt controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular seat belt controller capable of effectively improving an occupant's ride comfort regardless of the vehicle behavior and reducing a driver's fatigue during driving. <P>SOLUTION: The vehicular seat belt controller includes: a vehicle behavior detection unit 28 for detecting the vehicle behavior; a controller 30 for setting the targeted tension of a seat belt corresponding to the detected vehicle behavior; and a motor control unit 32 for controlling the drive of a motor 24 corresponding to the targeted tension set by the controller 30 to control the tension of the seat belt. The controller 30 has a storage unit 46 and tension adjustment means 48. The storage unit 46 stores threshold characteristics indicating a boundary a person can recognize the rolling and pitching of the vehicle. The tension adjustment means 48 changes the targeted tension according to a relation between the swinging angular velocity of the smaller of the rolling or the pitching and a threshold characteristic line in response to the same bounce jerk on the bounce of the vehicle. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a vehicle seat belt control device that controls the tension of a vehicle seat belt, and is set by a vehicle behavior detection unit, a target tension setting unit that sets a target tension of a seat belt, and a target tension setting unit. The present invention relates to a vehicle seat belt control device comprising: a drive control unit that controls the tension of a seat belt by controlling driving of the driving unit in response to the target tension.

  A conventionally known seat belt device provided in a vehicle such as an automobile is a seat belt retractor that is a housing portion that can wind or withdraw a seat belt, a tongue that is engaged with the seat belt, and a tongue that is attached to and detached from the seat belt device. With a possible buckle. The seat belt is worn by joining the tongue to the buckle while the person is sitting on the seat. For example, the seat belt retractor includes an elastic force imparting unit such as a spring that constantly urges a reel that winds up the seat belt in the winding direction.

  In Patent Document 1, nine modes such as a non-use mode for belt tension adjustment, a belt winding mode, a comfort mode, and a caution mode are set. For example, as a condition for setting the comfort mode, for example, the front Describes a seat belt control system that sets conditions such as when there is no detected object.

  Patent Document 2 discloses that the tension of the seat belt in the seats other than the driver's seat is larger than the tension of the seat belt in the driver's seat when braking the vehicle, and the tension of the seat belt in the driver's seat is other than that in the driver's seat when turning There is described a vehicle seat belt device including a control unit that makes the tension of the seat belt of the seat larger than that.

  Further, Patent Document 3 includes calculation means for calculating at least one of the vehicle skid frequency and the average value of the vehicle skid state amount, and a seat belt adjusting means for adjusting the tension of the seat belt based on the calculation result of the calculation means. A vehicle occupant restraint control device including a control unit to be controlled is described. Further, Patent Document 4 describes a vehicle seat belt control device that controls the seat belt winding tension in accordance with the lateral acceleration felt by the occupant to suppress the upper body displacement of the occupant. Has been.

JP 2000-135969 A JP 2003-327076 A JP 2007-1423 A JP 2007-245877 A

  In the case of a conventionally known seat belt device, during normal driving of the vehicle, the tension of the seat belt is maintained at a low predetermined value so that a human body can move easily. For this reason, when the road surface state is a non-flat road such as a wavy road or a step, an occupant can easily move along with the behavior of the vehicle against a road surface disturbance due to overpass. In other words, when the vehicle swings such as rolling or pitching, the occupant also swings, but when the occupant is in a state of being easy to move with respect to the seat, the occupant's inertial force greatly swings, effectively improving the ride comfort There is room for improvement from the aspect. Here, rolling is a movement that swings around the axis when the longitudinal direction of the vehicle is the axis, and pitching is a movement that swings around the axis when the width direction of the vehicle, that is, the horizontal direction is the axis. It is a movement to do.

  In addition, if a road surface disturbance is input to the vehicle while the vehicle is traveling on the highway, the driver himself may also shake greatly. In this case, if the steering wheel is moved along with the driver's movement, the vehicle Causes stagger. For this reason, there is room for improvement in terms of enabling the driver to respond quickly to changes in the road surface, finding obstacles, etc., and reducing fatigue due to the driver's mental stress, There is room for improvement in terms of reducing fatigue. In the case of the configurations described in Patent Documents 1 to 4, there is room for improvement in terms of eliminating the above disadvantages.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle seat belt control device that effectively improves the ride comfort of an occupant and reduces fatigue during driving by a driver regardless of the behavior of the vehicle.

  Among the vehicle seat belt control devices according to the present invention, the vehicle seat belt control device according to the first invention is a vehicle seat belt control device that controls the tension of the vehicle seat belt, and detects vehicle behavior. A vehicle behavior detection unit that controls the driving of the drive unit corresponding to the target tension set by the target tension setting unit, a target tension setting unit that sets the target tension of the seat belt corresponding to the detected vehicle behavior A drive control unit that controls the tension of the seat belt, and the target tension setting unit includes a storage unit that stores threshold characteristics representing a boundary that a person can recognize with respect to rolling and pitching of the vehicle, and a vehicle When the smaller amount of rolling and pitching is larger than the threshold characteristic line, the target tension is increased, and the amount of vehicle bounce is related to vehicle bounce. And a tension adjusting means for maintaining the target tension when the smaller one of rolling and pitching is smaller than the threshold characteristic line or reducing the target tension. This is a vehicle seat belt control device.

  According to the vehicle seat belt control device described above, the vehicle behavior detection unit detects the vehicle behavior, and the target tension setting unit responds to the behavior with respect to the behavior amount related to the bounce of the vehicle. The target tension is increased when the smaller behavior amount is larger than the threshold characteristic line, and the target when the smaller behavior amount between rolling and pitching is smaller than the threshold characteristic line relative to the vehicle bounce behavior amount. Maintain tension or decrease target tension. For this reason, the target tension setting unit can increase the seat belt target tension before the feeling of swinging in consideration of the sensation characteristics of the occupant's swinging, and the drive control unit drives according to the target tension. By controlling the driving of the part, the tension of the seat belt can be controlled. Moreover, the target tension can be prevented from becoming excessively large when the body moves according to the occupant's intention regardless of the behavior of the vehicle, and the restraining force of the person by the seat belt is excessively increased when unnecessary. There is no. For this reason, while restraining unnecessary restraint, large swaying of the occupant can be suppressed regardless of the behavior of the pitching or rolling vehicle, and the riding comfort can be effectively improved. In addition, it is possible to easily reduce driver fatigue for a long time. In addition, it is possible to suppress human body swinging due to road surface disturbance during high-speed traveling, making it difficult for unnecessary steering operations due to human body swinging to occur, and reducing driver fatigue during driving.

  In the vehicle seat belt control device according to the present invention, the vehicle seat belt control device according to the second invention is a vehicle seat belt control device that controls the tension of the vehicle seat belt, and is a vehicle behavior. A vehicle behavior detection unit that detects the vehicle tension, a target tension setting unit that sets a target tension of the seat belt corresponding to the detected vehicle behavior, and a drive of the drive unit corresponding to the target tension set by the target tension setting unit A drive control unit that controls the tension of the seat belt by controlling, the vehicle behavior detecting unit detects the floor vertical acceleration of the vehicle, and the target tension setting unit is based on the detected value of the floor vertical acceleration of the vehicle The absolute value of the human body vertical acceleration estimation means for estimating the human body vertical acceleration and the human body vertical acceleration estimation value obtained by the human body vertical acceleration estimation means is larger than the preset acceleration setting value. Whether the target tension of the seat belt is maintained when the target tension of the seat belt is increased and the absolute value of the human body vertical acceleration estimated value obtained by the human body vertical acceleration estimating means is equal to or less than a preset acceleration setting value. Alternatively, the vehicle seat belt control device includes a tension adjusting unit that reduces the tension. The acceleration set value is set in consideration of the response characteristics of the seat belt tension control and the restraint feeling felt by a person.

  According to the vehicle seat belt control device described above, the vehicle behavior detection unit detects the vehicle behavior that is the vehicle floor vertical acceleration, and the target tension setting unit estimates the human body vertical acceleration corresponding to the behavior, The target tension is increased when the absolute value of the estimated vertical acceleration value is larger than the preset acceleration setting value, and the target value is set when the absolute value of the human body vertical acceleration estimated value is equal to or less than the preset acceleration setting value. Maintain or reduce tension. For this reason, the target tension setting unit can increase the target tension when the absolute value of the acceleration in the vertical direction of the occupant is large, and can suppress the large behavior of the occupant due to the behavior of the vehicle. Moreover, the target tension can be prevented from becoming excessively large when the body moves according to the occupant's intention regardless of the behavior of the vehicle, and the restraining force of the person by the seat belt is excessively increased when unnecessary. There is no. For this reason, it is possible to effectively improve the ride comfort of the occupant. In addition, it is possible to easily reduce driver fatigue for a long time.

  Further, in the vehicle seat belt control apparatus according to the second invention, preferably, the vehicle seat belt control device includes a pull-out amount detection unit that detects a pull-out length of the seat belt when a person fastens the seat belt, and the target tension setting unit includes: The human body vertical acceleration estimation means outputs the human body vertical acceleration with respect to the vehicle floor vertical acceleration. The human body vertical acceleration estimation means includes a body type estimation means for estimating which of a plurality of body types from the output of the drawer amount detection unit. From among a plurality of types of transfer characteristic models, one of the transfer characteristic models is selected according to the body shape estimated by the body shape estimation means, and the detected value of the floor vertical acceleration of the vehicle is selected using the selected transfer characteristic model. Estimate human body vertical acceleration.

  In the vehicle seat belt control apparatus according to the present invention, preferably, the target tension setting unit stores a reference target tension group of a plurality of seat belts or a set tension group that stores a plurality of tension coefficient groups to be multiplied by the reference target tension. A tension adjustment means sets a target tension using a reference target tension or a tension coefficient read from the set tension group database.

  In the vehicle seat belt control device according to the present invention, preferably, the vehicle seat belt control device includes a pull-out amount detection unit that detects a pull-out length of the seat belt when a person fastens the seat belt, and the target tension setting unit includes the pull-out amount. Body shape estimation means for estimating which body type a person has from among the types of body shapes from the output of the detection unit, and correction means for correcting the target tension of the seat belt according to the body shape estimated by the body shape estimation means And comprising.

  According to the vehicle seat belt control device described above, the ride comfort of the occupant can be more effectively improved according to the occupant's body shape.

  According to the vehicle seat belt control apparatus of the present invention, it is possible to effectively improve the ride comfort and reduce the driver's fatigue during driving regardless of the behavior of the vehicle.

[First Embodiment]
Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. 1 to 7 show a first embodiment of the present invention. FIG. 1 is a schematic perspective view showing a seat belt device for controlling tension by the vehicle seat belt control device of the present embodiment and a seat. FIG. 2 is a block diagram showing a basic configuration of the vehicle seat belt control apparatus according to the present embodiment. FIG. 3 is a diagram showing the configuration of FIG. 2 in more detail. 4A and 4B are diagrams illustrating pitching, FIG. 4B is a diagram illustrating rolling, and FIG. 4C is a diagram illustrating bouncing for explaining three types of behavior of the vehicle. FIG. 5 is a diagram showing experimental results performed in advance for obtaining a map stored in the storage unit in relation to bounce jerk and a swing angular velocity representing a rolling and pitching discrimination threshold. FIG. 6 is a diagram corresponding to FIG. 5 for explaining a map stored in the storage unit. FIG. 7 is a flowchart showing a method of controlling the tension of the seat belt by the vehicle seat belt control device of the present embodiment.

  As shown in FIG. 1, a vehicle seat belt device 10 that controls tension by the vehicle seat belt control device of the present embodiment is provided on a tongue 14 engaged with a belt portion 12 and on a lower side of a seat 16. A buckle 18, a seat belt retractor 20 that is an accommodating portion capable of winding or withdrawing the belt portion 12, and a belt guide 22 for guiding an intermediate portion of the belt portion 12 on the shoulder upper side of an occupant (not shown). . The tongue 14 is detachable from the buckle 18.

  The vehicle seat belt control apparatus according to the present embodiment is used to adjust the tension of the belt portion 12 in a state where the tongue 14 is coupled to the buckle 18. For this purpose, the seat belt retractor 20 includes a reel (not shown) capable of winding the belt portion 12, a motor 24 (FIG. 3) that is a drive portion for rotating the reel, and a reel 24 in the winding direction of the belt portion 12. Elasticity imparting means (not shown) such as a mainspring spring that imparts elasticity is provided. The motor 24 can rotate in both directions, and the tension of the belt portion 12 can be adjusted by rotating the motor 24. The seat belt retractor 20 may be configured not to include elasticity applying means. In addition, the motor 24 can be configured to be capable of rotating in only one direction, and to adjust the tension by taking into account the elasticity of the elasticity applying means.

  As shown in FIG. 2, the vehicle seat belt control device 26 according to the present embodiment includes a vehicle behavior detection unit 28 that detects the behavior of the vehicle, a controller 30 that is a target tension setting unit, and a drive control unit. A motor control unit 32. A detection signal from the vehicle behavior detection unit 28 is input to the controller 30, and a signal corresponding to the target tension output from the controller 30 is input to the motor control unit 32, whereby the tension of the belt unit 12 (FIG. 1) is increased. It can be controlled.

  As shown in FIG. 3, the motor control unit 32 includes a driver 34 and a motor 24 provided in the seat belt retractor 20. The motor 24 is driven by being supplied with a driving current from the driver 34, and the driver 34 receives a drive signal corresponding to the target tension of the belt unit 12 (FIG. 1) from the controller 30. That is, the motor control unit 32 controls the tension of the belt unit 12 by controlling the driving of the motor 24 in accordance with the target tension of the belt unit 12 set by the controller 30. Further, the driver 34 and the controller 30 can be integrated into a single control unit 36 as shown in FIG. In addition, the controller 30 sets a target tension of the belt unit 12 (FIG. 1), and sets a signal indicating the rotation direction of the motor 24 corresponding to the target tension and a torque command value.

  More specifically, as shown in FIG. 3, the vehicle behavior detection unit 28 includes a pitching sensor 38, a rolling sensor 40, and a vertical acceleration sensor 42, and each of the vehicle behavior detection unit 28 includes pitching, rolling, and vertical motion. Acceleration can be detected. Detection signals from the sensors 38, 40, and 42 are input to a calculation unit 44 provided in the controller 30. The controller 30 is a computer composed of a CPU, a memory, and the like, and sets a target tension of the belt portion 12 (FIG. 1) corresponding to the detected vehicle behavior.

  Further, the controller 30 includes the calculation unit 44 and the storage unit 46, and the calculation unit 44 includes a tension adjusting unit 48. Further, the vehicle seat belt control device 26 includes a steering angle sensor 50 that can detect a steering angle with respect to a neutral position in a straight traveling state of a steering wheel (not shown) of the vehicle, a vehicle speed sensor 52 that detects a vehicle speed, and a motor. The sensor 54 is provided with detection signals from the sensors 50, 52, and 54. The motor sensor 54 is a state in which the rotation angle of the motor 24 and the tongue 14 of the seat belt shown in FIG. 1 are pulled back to the side plate portion side of the vehicle body, that is, the door side to the maximum, or the tongue 14 is engaged with the buckle 18. A sensor that detects the amount of rotation of the motor 24 from the initial state. The vehicle seat belt control device 26 rotates the motor 24 at a rotational angular acceleration set in any direction while using the rotation angle of the motor 24 and the detected value of the rotation amount of the motor 24 from the initial state. Thus, the tension of the belt portion 12 (FIG. 1) can be adjusted.

  The storage unit 46 includes a map storage unit 56 and a set tension group database 58. The map storage unit 56 stores data representing threshold characteristics representing boundaries that can be recognized by a person regarding rolling and pitching of a vehicle. Here, pitching and rolling will be described.

  First, as shown in FIG. 4A, the pitching, that is, the pitch motion is an axis O1 that passes through the center of gravity of the vehicle 60 and faces the width direction of the vehicle 60, that is, the left-right direction (the front and back direction in FIG. 4A). It is a movement that swings around the center. Further, as shown in FIG. 4B, the rolling, that is, the roll motion, swings around the axis O2 passing through the center of gravity of the vehicle 60 that faces the front-rear direction of the vehicle 60 (the front and back direction in FIG. 4B). It is a moving movement. In addition, bouncing is a movement in which the entire vehicle 60 is displaced up and down due to road surface unevenness as shown in FIG.

  The pitching sensor 38 (FIG. 3) is composed of, for example, two acceleration sensors provided at positions distant from the front and rear of the vehicle 60 (left and right in FIG. 4 (a)), and is called pitch rate, a pitching fluctuation angular velocity ω1. (FIG. 4A) is detected. Further, the rolling sensor 40 (FIG. 3) is composed of, for example, two acceleration sensors provided at positions distant from the left and right of the vehicle 60 (left and right in FIG. 4B), and is called rolling rate. The angular velocity ω2 (FIG. 4B) is detected. The pitching sensor 38 and the rolling sensor 40 can also be constituted by gyro sensors. Bouncing is detected by the vertical acceleration sensor 42 (FIG. 3). The vertical acceleration sensor 42 detects vertical acceleration that is acceleration in the vertical direction of the floor of the vehicle 60.

  In addition, the inventor has a bounce jerk, that is, a boundary between time differentiation of acceleration in the vertical direction of the vehicle 60 and whether or not an occupant of the vehicle 60 can recognize rolling when the vehicle 60 swings. It has been found that there is a relationship between the discrimination threshold and the pitch discrimination threshold that is a boundary of whether or not the occupant of the vehicle 60 can recognize pitching when the vehicle 60 swings. In this embodiment, using such knowledge, the tension of the seat belt is appropriately increased when a person feels shaking to suppress the shaking of the person. First, the relationship between the bounce jerk, the roll discrimination threshold value, and the pitch discrimination threshold value, which has been found by experiments conducted by the present inventor, will be described with reference to FIG.

  In FIG. 5, the horizontal axis represents the bounce jerk, that is, the time differentiation of the vertical acceleration of the vehicle, and the vertical axis represents the discrimination threshold between the roll and the pitch, and is shown on a logarithmic scale. The circle in FIG. 5 is the roll discrimination threshold, and the black square is the pitch discrimination. The experiment for obtaining such a discrimination threshold was carried out by reproducing the step over the vehicle with a six-degree-of-freedom vibrator and changing the input representing the step variously. Since the acceleration corresponds to the load, the bounce jerk corresponds to the time change of the load.

  As is apparent from the results shown in FIG. 5, the roll and pitch discrimination thresholds are a function of bounce jerk. Further, the bounce jerk is at a certain value Js, and the upper and lower sides of the roll discrimination threshold and the pitch discrimination threshold are reversed. That is, when the bounce jerk is smaller than the predetermined value Js, the discrimination threshold for recognizing the pitch motion is lower than the roll motion. That is, it can be seen that the bounce jerk is a low value, and that a person can easily recognize the pitch motion rather than the roll motion. On the contrary, when the bounce jerk is larger than the predetermined value Js, the discrimination threshold for recognizing the roll motion is lower than the pitch motion. That is, it can be seen that the bounce jerk has a high value, and that a person can easily recognize the roll motion rather than the pitch motion. From such a result, as shown in FIG. 6, the present inventor has obtained data representing a threshold characteristic line L representing a smaller value of the roll discrimination threshold and the pitch discrimination threshold for the same bounce jerk. (FIGS. 2 and 3) and the threshold characteristic line L (FIG. 6) with the smaller value of the pitching and rolling angular velocities ω1 and ω2 (FIG. 4) with respect to the actually detected bounce jerk. If it is larger, the controller 30 controls the tension so as to increase the tension of the seat belt.

  Specifically, the map storage unit 56 included in the controller 30 illustrated in FIG. 3 stores data representing the threshold characteristic line L illustrated in FIG. In other words, because the person who feels the lower discrimination threshold due to the movement of pitch and roll that the person feels is more sensitive, the lower threshold of the discrimination threshold of the pitch and roll is set to the threshold for the bounce jerk. The data is stored in the map storage unit 56 as data representing the characteristic line. In the present embodiment, when the smaller one of the detected vehicle angular velocities is larger than the discrimination threshold value of the threshold characteristic stored in the map storage unit 56, the occupant's oscillation is suppressed. This reduces movements that are uncomfortable for the occupant. For this purpose, the tension adjusting means 48 shown in FIG. 3 is obtained from the threshold characteristics stored in the map storage unit 56, the angular velocity of pitching and rolling, which are actually detected angular velocities, and the vertical acceleration sensor 42. Using the bounce jerk obtained from the vertical acceleration, the smaller behavior amount of rolling and pitching, that is, the smaller swing angular velocity for the same bounce jerk, that is, the same bounce jerk, from the threshold characteristic line The target tension of the seat belt is increased when the upper limit is larger, and the target tension of the seat belt is maintained when the smaller angular velocity of rolling and pitching is smaller than the threshold characteristic line for the same bounce jerk, or The target tension is made small. For the bounce jerk and the swing angular velocity, for example, absolute values are used.

  The set tension group database 58 stores a plurality of seat belt reference target tension groups and a plurality of types of tension coefficients K for setting the target tension F. The reference target tension group includes a predetermined tension Fw at the time of steering and a predetermined tension Fs at the time of straight traveling, and stores a plurality of tensions corresponding to the vehicle speed, for example. For example, when the vehicle speed is low, small Fs1 is used as Fs, and when the vehicle speed is high, large Fs2 is used as Fs. Note that the vehicle seat belt control device 26 includes an occupant camera that can recognize the movement of the occupant based on an image of the passenger compartment, and the amount of the seat belt pulled out from the reel based on the image from the occupant camera. If it is determined that the increase is due to a spontaneous movement such as the occupant's picking up, the tension of the seat belt can be reduced.

  Further, the tension adjusting means 48 sets a reference target tension corresponding to the detected values from the steering angle sensor 50 and the vehicle speed sensor 52, and the smaller one of the actual pitching and rolling swing angular velocities ω1 and ω2 (FIG. 4). The tension coefficient K to be multiplied by the reference target tension is determined according to whether the threshold characteristic is greater than or less than the threshold characteristic for the same bounce jerk. The tension coefficient K includes a predetermined value K1 greater than 1 and a predetermined value K2 of 1 or less.

  The tension adjusting unit 48 sets the target tension using at least one value of the reference target tensions Fw and Fs read from the set tension group database 58 and the tension coefficient K. It should be noted that different reference target tensions can be stored in the set tension group database 58 corresponding to the difference in seats. Further, the vehicle seat belt control device 26 is provided with a front detection sensor for detecting the presence or absence of an obstacle such as another vehicle in front of the vehicle, and another reference target tension is set corresponding to the detected value. Can also be stored. For example, a small reference target tension can be used when no obstacle is detected near the front of the vehicle, and a large reference target tension can be used when an obstacle is detected.

  Corresponding to the target tension set by the tension adjusting means 48 and the detection value of the motor sensor 54, the calculation unit 44 sets the target rotation direction of the motor 24 and the target rotation angular velocity of the motor 24, and the motor By outputting a signal corresponding to the setting to the control unit 32, the tension of the seat belt is controlled.

  Next, a method for controlling the tension of the seat belt using such a vehicle seat belt control device 26 will be described with reference to a flowchart shown in FIG. In the following description, the same elements as those shown in FIGS. 1 to 4 will be described using the same reference numerals. First, the detection values from the vehicle speed sensor 52, the steering angle sensor 50, the vertical acceleration sensor 42, the rolling sensor 40, the pitching sensor 38, and the motor sensor 54 are read by the calculation unit 44 of the controller 30 (S1).

  Next, the calculation unit 44 determines whether or not the steering angle is equal to or larger than a predetermined angle set in advance (S2). If the steering angle is equal to or greater than the predetermined angle, the calculation unit 44 determines that the vehicle is in a steering state, and proceeds to step S3. The predetermined angle set in advance for the steering angle may be other than zero. In step S3, the tension adjusting means 48 uses the data stored in the set tension group database 58 to set the target tension F to a reference target tension Fw that is a predetermined tension at the time of steering. Seat belt tension control is performed by outputting a signal corresponding to the target tension F to the controller 32 (S4).

  On the other hand, if the determination in step S2 is negative, it is determined that the vehicle is in a straight traveling state, and the target tension F is set to a reference target tension Fs that is a predetermined tension during straight traveling (S5). Next, roll pitch threshold value characteristic map data representing threshold characteristic stored in the map storage unit 56, bounce jerk obtained from the detected value of the vertical acceleration sensor 42, and detected value of the pitching sensor 38 are obtained. Using the swinging angular velocity ω1 of pitching and the rolling angular velocity ω2 obtained from the detection value of the rolling sensor 40, the tension adjusting means 48 uses the smaller of the threshold characteristic and the swinging angular velocity ω1, ω2 with respect to the bounce jerk. The shaking angular velocity is compared (S6). When the tension adjusting unit 48 determines in step S7 that the smaller rolling angular velocity of rolling and pitching is larger than the threshold characteristic line for the same bounce jerk related to the bounce of the vehicle, for example, the detected swing When it is determined that the angular velocity ωp is at the position shown in the map of FIG. 6, a tension coefficient K greater than 1 is set (S8), and the reference target tension Fs is multiplied by the tension coefficient K (K · Fs). ) Is set as the target tension F (S9), and the seat belt tension is controlled in the same manner as described above (S4). As a result, the target tension F increases.

  On the other hand, when the tension adjusting means 48 determines in step S7 that the smaller angular velocity of rolling and pitching is below the threshold characteristic line for the same bounce jerk related to the bounce of the vehicle, for example, If it is determined that the detected angular velocity ωq is at the position shown in the map of FIG. 6, a tension coefficient K of 1 or less is set (S10), and the reference target tension Fs is multiplied by the tension coefficient K (K Fs) is set as the target tension F (S9), and the seat belt tension is controlled in the same manner as described above (S4). Thereby, the target tension F is maintained or decreased. That is, when the tension coefficient K is 1, the target tension is maintained, and when the tension coefficient K is less than 1, the target tension becomes small. In this case, whether the tension coefficient K is 1 or less than 1 is determined in advance, and a setting value corresponding to the determination is stored in the storage unit 46. Note that the tension coefficient K may be variable depending on the size of the bounce jerk. For example, when the tension coefficient K is larger than 1, when the bounce jerk is small, the tension coefficient K is decreased to a value larger than 1, and when the bounce jerk is large, the tension coefficient K is smaller than 1. Increase it with a larger value.

  According to the present embodiment as described above, it is determined that the vehicle is traveling straight when the steering angle during traveling is less than a predetermined value, and the vehicle is pitched and rolled by overcoming the road step and unevenness in the straight traveling state. When the combined motion with the vertical displacement occurs, the smaller swing angular velocity of rolling and pitching of the floor of the vehicle represented by the signal from the vehicle behavior detecting unit 28 that detects the behavior amount is generated in the bounce jerk. On the other hand, the tension of the seat belt increases when it exceeds the threshold characteristic, and the tension of the seat belt is maintained or decreased otherwise. For this reason, the controller 30 can increase the target tension of the seat belt before the feeling of swinging in consideration of the sensation characteristics with respect to the swing of the occupant, and the motor control unit 32 responds to this target tension by the motor 24. The tension of the seat belt can be controlled by controlling the drive. Moreover, regardless of the behavior of the vehicle, it is possible to prevent the target tension from becoming excessively large when the body moves due to the intention of the occupant, such as picking up, and excessively restraining the person with the seat belt when unnecessary. Don't make it bigger. For this reason, while suppressing unnecessary restraint, regardless of the behavior of the vehicle of pitching or rolling, it is possible to suppress a large swing of the occupant, and to reduce the occupant's discomfort to the bad conditions of the road surface such as oversteps, Riding comfort can be improved effectively. In addition, it is possible to easily reduce driver fatigue for a long time. In addition, human body swinging due to road surface disturbances during high-speed driving can be suppressed, making it difficult for unnecessary steering operations to occur due to human body swinging, reducing mental stress accumulation, and reducing driver fatigue during driving. Easy to do.

[Second Embodiment]
FIG. 8 is a diagram showing a configuration of a vehicle seat belt control apparatus according to the second embodiment of the present invention. FIG. 9 is a flowchart showing a method of controlling the tension of the seat belt by the vehicle seat belt control device of the present embodiment. In the present embodiment, in the first embodiment described above, when the occupant fastens the seat belt, that is, the tongue 14 (see FIG. 1) is attached to the buckle 18 (see FIG. 1) to the vehicle seat belt control device 26a. A pull-out amount sensor 62 is provided for detecting the pull-out length of the belt portion 12 from the reel when the belt portion 12 is engaged, and inputting a detection signal to the calculation portion 44. The pull-out amount sensor 62 can be constituted by, for example, a reel rotation amount sensor that detects the rotation amount of the reel from the state where the tongue 14 is fully returned to the door side.

  The calculation unit 44 includes a body type estimation unit 64 and a body type tension coefficient correction unit 66. The body shape estimation means 64 estimates from the output of the pull-out amount sensor 62 which body shape the occupant has among a plurality of types of body shapes stored in advance. That is, when the amount of withdrawal is large, it is estimated that the figure is a large figure, when it is little, it is assumed that it is a figure of small size, and when it is an intermediate quantity of withdrawal, it is a medium figure. Presume that there is. The plurality of types of body shapes stored in the controller 30 are not limited to these three types of body shapes, and may be a plurality of types other than the three types.

  The body tension coefficient correction means 66 corrects the reference target tension Fw of the seat belt or the tension coefficient K to be multiplied by the reference target tension Fs according to the body shape estimated by the body shape estimation means 64 to thereby obtain the target tension. F is corrected. That is, the body tension coefficient correction means 66 sets a body shape correction coefficient R to be multiplied by the reference target tension Fw or the tension coefficient K according to the body shape. For example, the body shape correction coefficient R is increased in the order of large pattern, medium pattern, and small pattern. That is, the body shape correction coefficient R is maximized for the large pattern. For example, the body shape correction coefficient R is made larger than 1 for a large body shape, and the body shape correction coefficient R is made smaller than 1 for a small body shape.

  Next, a method for controlling the tension of the seat belt using the vehicle seat belt control device of the present embodiment will be described with reference to FIG. In the following description, the same elements as those shown in FIG. In step S <b> 2 of FIG. 9, the occupant's body shape is estimated by the body shape estimating means 64, and the body shape correction coefficient R is set by the body shape tension coefficient correcting means 66. Next, in step S3, the tension adjusting unit 48 determines whether or not the steering angle is equal to or greater than a predetermined angle. If the determination is affirmative, that is, if it is determined that the steering is being performed, R · Fw obtained by multiplying the reference target tension Fw by the body shape correction coefficient R is set as the target tension F (S4), and the tension of the seat belt is controlled (S5).

  On the other hand, if it is determined in step S3 that the steering angle is less than the predetermined angle, that is, the vehicle is in a straight traveling state, the process proceeds to step S6, and the tension coefficient K is set in accordance with the swing angular velocity in steps S9 and S11. After the setting, the tension adjusting means 48 sets a value (KR · Fs) obtained by multiplying the reference target tension Fs for straight traveling by the body shape correction coefficient R and the tension coefficient K as the target tension F (S10). ), The tension of the seat belt is controlled (S5).

  According to this embodiment, the ride comfort of the occupant can be more effectively improved according to the occupant's body shape. That is, the inertial force of the occupant's human body caused by the vehicle behavior depends on the body weight, and the body weight roughly depends on the body shape. For this reason, when the occupant has a small body shape, the swaying of the occupant can be kept small even if the required tension of the seat belt is made smaller than that having the medium and large body shapes. On the contrary, when the occupant has a large body shape, in order to suppress the swaying of the occupant, it is necessary to make the necessary tension of the seat belt larger than that having the medium and small body shapes. For this reason, by changing the target tension of the seat belt according to the body shape as in the present embodiment, the ride comfort of the occupant can be improved without excessively increasing the feeling of tightening the seat belt. That is, the passenger comfort can be improved, and the ride comfort of the passenger can be improved more effectively. Since other configurations and operations are the same as those in the first embodiment, the same parts are denoted by the same reference numerals, and overlapping illustrations and descriptions are omitted.

[Third Embodiment]
FIG. 10 is a flowchart showing a method for controlling the tension of the seat belt by the vehicle seat belt control apparatus according to the third embodiment of the present invention. In this embodiment, in the first embodiment shown in FIG. 1 to FIG. 7 described above, when the straight angular velocity of the smaller swing angular velocity of rolling and pitching with respect to the bounce jerk becomes larger than the threshold characteristic. In addition, the target tension F is kept constant for a certain period of time. In the following description, the same elements as those shown in FIGS. 1 to 4 will be described using the same reference numerals.

  In the present embodiment, in the flowchart (see FIG. 7) described in the first embodiment, the step flag is turned on after setting the target tension F to the reference target tension Fs in step S5 of FIG. It is determined whether or not it has been done. Since the step flag is off in the initial state, in step S7, the threshold characteristic is compared with the smaller swing angular velocity of rolling and pitching with respect to the bounce jerk, and if the smaller swing angular velocity is greater than the threshold characteristic. If determined, the step flag with timer is turned on. The stepped flag with timer is turned off after a predetermined time has elapsed.

  Next, a value (K · Fs) obtained by multiplying the reference target tension Fs by a tension coefficient K greater than 1 in steps S10 and S11 is set as the target tension F, and the seat belt tension is controlled (S4). The fixed time for turning on the step flag is a time required for the swinging of the human body to converge, for example, about several seconds.

  Further, when the process proceeds to step S7 again, if the step flag is on, that is, before a predetermined time has elapsed, the target tension F is multiplied by a tension coefficient K greater than 1 by a predetermined tension Fs ( K · Fs) and maintain. According to the present embodiment, the tension of the seat belt does not immediately decrease even if the angular velocity of the swing falls below the threshold characteristic before the fixed time elapses after the timer stepped flag is turned on. . For this reason, when the unevenness | corrugation of a fine road surface passes, it can be hard to produce a passenger | crew's uncomfortable feeling by the tension | tensile_strength of a seatbelt changing frequently. Other configurations and operations are the same as those in the first embodiment shown in FIGS. Note that this embodiment can also be combined with the configuration of the second embodiment shown in FIGS.

[Fourth Embodiment]
FIG. 11 is a diagram showing a configuration of a vehicle seat belt control apparatus according to the fourth embodiment of the present invention. FIG. 12 is a flowchart showing a method for controlling the tension of the seat belt by the vehicle seat belt control apparatus of the present embodiment. In the vehicle seat belt control device 26b according to the present embodiment, unlike the case of the first embodiment shown in FIGS. 1 to 7, the vehicle behavior detection unit 28 includes the pitching sensor 38 shown in FIG. And the rolling sensor 40 are not provided. The calculation unit 44 included in the controller 30 includes human body vertical acceleration estimation means 68. The storage unit 46 does not include the map storage unit 56 shown in FIG.

  In the present embodiment, the tension of the seat belt is controlled using the absolute value of the estimated value of the human body vertical acceleration, which is the acceleration in the vertical direction of the human body. That is, the human body vertical acceleration estimating means 68 receives the detected value of the vehicle floor vertical acceleration detected by the vertical acceleration sensor 42, and estimates the human body vertical acceleration from the detected value. That is, when estimating the vertical acceleration of the human body, the floor vertical acceleration for each sampling time obtained by reading the detection signal from the vertical acceleration sensor 42 is input to a transfer characteristic model having a preset transfer function, and The vertical acceleration which is the vertical acceleration of is output, that is, estimated. The transfer characteristic model can output the vertical acceleration of the occupant's waist seated on the seat when the vertical acceleration of the floor is input.

  In addition, since such a transfer characteristic model for estimating the vertical acceleration of the waist depends on the weight of the occupant, a different model can be used according to the occupant's body shape estimated from the pull-out amount of the belt portion 12. . That is, the transfer characteristic model can be corrected by the occupant body shape. For example, the vehicle seat belt control device 26b includes the pull-out amount sensor 62 described in the third embodiment shown in FIGS. 8 to 9 and the body shape estimation means 64, and estimates the human body vertical acceleration. The means 68 selects any one of the plurality of transfer characteristic models for outputting the human body vertical acceleration with respect to the vehicle floor vertical acceleration according to the body shape estimated by the body shape estimation means 64, It can also be set as the structure which estimates a human body vertical acceleration from the detected value of the floor vertical acceleration of a vehicle using the selected transfer characteristic model.

  Further, the tension adjusting unit 48 determines that the absolute value | M | of the human body vertical acceleration estimated value obtained by the human body vertical acceleration estimating unit 68 is larger than a preset acceleration setting value dM (| M |> dM). When the target tension of the seat belt is increased and the absolute value | M | of the human body vertical acceleration estimated value obtained by the human body vertical acceleration estimating means 68 is equal to or less than a preset acceleration setting value (| M | ≦ dM). Maintain or reduce the target tension of the seat belt. Then, the controller 30 outputs a control signal to the motor control unit 32 in accordance with the target tension set by the tension adjusting means 48.

  Next, a method for controlling the tension of the seat belt using such a vehicle seat belt control device 26b will be described with reference to the flowchart shown in FIG. In the following description, the same elements as those shown in FIG. 11 will be described using the same reference numerals. First, detection values from the vehicle speed sensor 52, the steering angle sensor 50, the vertical acceleration sensor 42, and the motor sensor 54 are read by the calculation unit of the controller 30 (S1).

  Next, it is determined whether or not the steering angle is greater than or equal to a predetermined angle set in advance (S2). If it is determined that the steering angle is equal to or greater than the predetermined angle, that is, the vehicle is in a steering state, the process proceeds to step S3. The predetermined angle set in advance for the steering angle may be other than zero. In step S <b> 3, the tension adjusting unit 48 uses the data stored in the set tension group database 58 to set the target tension F to the reference target tension Fw at the time of steering, and the controller 30 instructs the motor control unit 32 to set the target tension Fw. The seat belt tension control is performed by outputting a signal corresponding to the tension F (S4).

  On the other hand, if the determination in step S2 is negative, that is, if it is determined that the vehicle is traveling straight, the target tension F is set to the reference target tension Fs for straight traveling (S5). Next, in step S6, as in the third embodiment shown in FIG. 10, it is determined whether or not the step flag is on. The acceleration M is estimated and calculated (S7). As described above, the human body vertical acceleration M is estimated by inputting the detected value of the floor vertical acceleration to the transfer characteristic model.

  Next, in step S8, the tension adjusting means 48 determines whether the estimated absolute value | M | of the human body vertical acceleration M is larger than the preset acceleration setting value dM (| M |> dM). After the dynamic flag is turned on (S9), a value (K · Fs) obtained by multiplying the reference target tension Fs by a tension coefficient K greater than 1 in steps S10 and S11 is set as the target tension F of the seat belt. Thereby, the target tension F of the seat belt is increased and the tension of the seat belt is controlled (S4).

  On the other hand, when the absolute value | M | of the human body vertical acceleration M is equal to or less than the preset acceleration setting value dM (| M | ≦ dM) in step S8, the tension adjusting unit 48 determines whether the absolute value | M | In S11, a value (K · Fs) obtained by multiplying the reference target tension Fs by a tension coefficient K of 1 or less is set as the target tension F of the seat belt. Thereby, the target tension F of the seat belt is maintained or reduced, and the tension of the seat belt is controlled (S4).

  According to the present embodiment, when | M | representing the absolute value of the vertical acceleration of the occupant's waist is larger than the acceleration set value dM in step S8, the occupant's body is easily separated from the seat. Therefore, the tension coefficient K is made larger than 1 to increase the target tension. In step S8, when | M | is equal to or less than the acceleration set value dM, the occupant's body is unlikely to leave the seat, so the tension coefficient K is set to 1 or less to maintain or reduce the target tension. For this reason, the controller 30 can increase the target tension of the seat belt when the absolute value of the acceleration in the vertical direction of the occupant is large, and can suppress a large behavior of the occupant due to the behavior of the vehicle. In addition, it is possible to prevent the target tension of the seat belt from becoming excessively large when the body moves due to the intention of the occupant, such as picking up, regardless of the behavior of the vehicle. The force is not increased excessively. For this reason, it is possible to effectively improve the ride comfort of the occupant. In addition, it is possible to easily reduce driver fatigue for a long time. That is, it is possible to suppress the vertical movement of the occupant that occurs when the vehicle passes through the road surface, which is an adverse condition such as road swell, without excessively restraining the occupant. Therefore, the movement of the line of sight of the occupant is reduced, and eyeball fatigue during driving for a long time can be reduced. Other configurations and operations are the same as those in the first embodiment shown in FIG. 1 to FIG. 7 or the third embodiment shown in FIG. The same reference numerals are assigned and duplicate descriptions are omitted.

[Fifth Embodiment]
FIG. 13 is a diagram showing a configuration of a vehicle seat belt control apparatus according to the fifth embodiment of the present invention. FIG. 14 is a flowchart showing a method for controlling the tension of the seat belt by the vehicle seat belt control device of the present embodiment. The vehicle seat belt control device 26c of the present embodiment includes the fourth embodiment shown in FIGS. 11 to 12 and the second embodiment shown in FIGS. It has a structure like a combination. That is, in the fourth embodiment, the pull-out amount sensor 62 is provided in the vehicle seat belt control device 26c in the fourth embodiment, similarly to the second embodiment. The calculation unit 44 includes a body type estimation unit 64 and a body type tension coefficient correction unit 66. The body type estimation means 64 estimates from the output of the pull-out amount sensor 62 whether the occupant has a plurality of types stored in advance, for example, large, medium or small. The plurality of types of body shapes stored in the controller 30 are not limited to these three types of body shapes, and may be a plurality of types other than the three types.

  The body tension coefficient correction means 66 corrects the reference target tension Fw of the seat belt or the tension coefficient K to be multiplied by the reference target tension Fs according to the body shape estimated by the body shape estimation means 64 to thereby obtain the target tension. F is corrected. That is, the body tension coefficient correction means 66 sets a body shape correction coefficient R to be multiplied by the reference target tension Fw or the tension coefficient K according to the body shape.

  Next, a method for controlling the tension of the seat belt using the vehicle seat belt control device 26c of the present embodiment will be described with reference to FIG. In the following description, the same elements as those shown in FIG. 13 will be described using the same reference numerals. In step S 2 in FIG. 14, the occupant's body shape is estimated by the body shape estimating means 64, and the body shape correction coefficient R is set by the body shape tension coefficient correcting means 66. Next, in step S3, the tension adjusting unit 48 determines whether or not the steering angle is equal to or greater than a predetermined angle. If the determination is affirmative, that is, if it is determined that the steering is being performed, R · Fw obtained by multiplying the reference target tension Fw by the body shape correction coefficient R is set as the target tension F (S4), and the tension of the seat belt is controlled (S5).

  On the other hand, if it is determined in step S3 that the steering angle is less than the predetermined angle, that is, the vehicle is in a straight traveling state, the process proceeds to step S6, and the tension coefficient K is changed to the human body vertical acceleration M in steps S11 and S13. After setting accordingly, the tension adjusting means 48 sets, as the target tension F, a value (KR · Fs) obtained by multiplying the reference target tension Fs for straight travel by the body shape correction coefficient R and the tension coefficient K. (S12), the tension of the seat belt is controlled (S5).

  According to this embodiment, like the second embodiment shown in FIGS. 8 and 9, the ride comfort of the occupant can be more effectively improved according to the occupant's body shape. it can. Other configurations and operations are the same as those of the second embodiment shown in FIGS. 8 to 9 or the fourth embodiment shown in FIGS. Are denoted by the same reference numerals, and redundant description is omitted.

  Although not shown in the drawings, in the fourth embodiment shown in FIGS. 11 to 12, the vehicle seat belt is similar to the second embodiment shown in FIGS. The control unit 26b is provided with a pull-out amount sensor 62, and the calculation unit 44 includes body shape estimation means 64. The calculation unit 44 has the absolute value of the human body vertical acceleration estimated value used in the determination in step S8 of FIG. | M | or a body acceleration / deceleration correction unit that corrects a preset acceleration setting value dM according to the body type of the occupant estimated by the body type estimation unit 64 may be employed. For example, the human body vertical acceleration correction means multiplies the absolute value | M | or the acceleration set value dM by a coefficient corresponding to the body shape, and uses the value obtained by the multiplication to determine the determination in step S8 in FIG. It can also be done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view showing a seat belt device for controlling tension by a vehicle seat belt control device according to a first embodiment of the present invention and a seat. It is a block diagram which shows the basic composition of the vehicle seatbelt control apparatus of 1st Embodiment. It is a figure which shows the structure of FIG. 2 in detail. For explaining three types of behavior of the vehicle, (a) is a diagram showing pitching, (b) is a diagram showing rolling, and (c) is a diagram showing bouncing. It is a figure which shows the experimental result previously performed in order to obtain | require the map memorize | stored in a memory | storage part by the relationship between the bounce jerk and the rocking angular velocity showing the discrimination threshold value of rolling and pitching. It is a figure corresponding to FIG. 5 for demonstrating the map memorize | stored in a memory | storage part. It is a flowchart which shows the method of controlling the tension | tensile_strength of a seatbelt by the vehicle seatbelt control apparatus of 1st Embodiment. It is a figure which shows the structure of the vehicle seatbelt control apparatus of the 2nd Embodiment of this invention. It is a flowchart which shows the method of controlling the tension | tensile_strength of a seatbelt by the vehicle seatbelt control apparatus of 2nd Embodiment. It is a flowchart which shows the method of controlling the tension | tensile_strength of a seatbelt by the vehicle seatbelt control apparatus of the 3rd Embodiment of this invention. It is a figure which shows the structure of the vehicle seatbelt control apparatus of the 4th Embodiment of this invention. It is a flowchart which shows the method of controlling the tension | tensile_strength of a seatbelt by the vehicle seatbelt control apparatus of 4th Embodiment. It is a figure which shows the structure of the vehicle seatbelt control apparatus of the 5th Embodiment of this invention. It is a flowchart which shows the method of controlling the tension | tensile_strength of a seatbelt by the vehicle seatbelt control apparatus of 5th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Vehicle seat belt apparatus, 12 belt part, 14 tongue, 16 seat, 18 buckle, 20 seat belt retractor, 22 belt guide, 24 motor, 26, 26a, 26b, 26c vehicle seat belt control apparatus, 28 vehicle behavior detection Part, 30 controller, 32 motor control part, 34 driver, 36 control unit, 38 pitching sensor, 40 rolling sensor, 42 vertical acceleration sensor, 44 calculation part, 46 storage part, 48 tension adjusting means, 50 steering angle sensor, 52 vehicle speed Sensor, 54 motor sensor, 56 map storage unit, 58 set tension group database, 60 vehicle, 62 pull-out amount sensor, 64 body type estimation means, 66 body type tension coefficient correction means, 68 human body vertical acceleration estimation means.

Claims (5)

A vehicle seat belt control device for controlling the tension of a vehicle seat belt,
A vehicle behavior detector for detecting vehicle behavior;
A target tension setting unit that sets a target tension of the seat belt corresponding to the detected vehicle behavior;
A drive control unit that controls the tension of the seat belt by controlling the drive of the drive unit corresponding to the target tension set by the target tension setting unit,
The target tension setting section
Storage means for storing a threshold characteristic representing a boundary that can be recognized by a person regarding rolling and pitching of a vehicle;
The target tension is increased when the smaller amount of rolling and pitching is larger than the threshold characteristic line with respect to the amount of behavior related to bounce of the vehicle. A vehicle seat belt control device comprising: tension adjusting means for maintaining a target tension when the smaller behavior amount is smaller than a threshold characteristic line or reducing the target tension. A vehicle seat belt control device for controlling the tension of a vehicle seat belt,
A vehicle behavior detector for detecting vehicle behavior;
A target tension setting unit that sets a target tension of the seat belt corresponding to the detected vehicle behavior;
A drive control unit that controls the tension of the seat belt by controlling the drive of the drive unit corresponding to the target tension set by the target tension setting unit,
The vehicle behavior detection unit detects the vehicle floor vertical acceleration,
The target tension setting section
Human body vertical acceleration estimation means for estimating human body vertical acceleration from the detected value of vehicle floor vertical acceleration,
When the absolute value of the human body vertical acceleration estimated value obtained by the human vertical acceleration estimating means is larger than the preset acceleration setting value, the target tension of the seat belt is increased, and the human vertical acceleration obtained by the human vertical acceleration estimating means is obtained. A vehicle seat belt control device comprising: tension adjusting means for maintaining or reducing a target tension of the seat belt when the absolute value of the estimated value is equal to or less than a preset acceleration setting value. The vehicle seat belt control device according to claim 2,
With a pull-out amount detection unit that detects the pull-out length of the seat belt when a person fastens the seat belt,
The target tension setting section
Comprising a body type estimation means for estimating which body type a person has from among the multiple types of body types from the output of the withdrawal amount detection unit;
The human body vertical acceleration estimating means selects one of the plurality of types of transfer characteristic models for outputting the human body vertical acceleration with respect to the vehicle floor vertical acceleration according to the body shape estimated by the body shape estimating means. A vehicle seat belt control device that estimates a human body vertical acceleration from a detected value of a vehicle floor vertical acceleration using a selected transfer characteristic model. The vehicle seat belt control device according to any one of claims 1 to 3,
The target tension setting section
A set tension group database that stores a reference target tension group of a plurality of seat belts or a plurality of tension coefficient groups to be multiplied by the reference target tension,
A vehicle seat belt control device, wherein a tension adjusting means sets a target tension using a reference target tension or a tension coefficient read from a set tension group database. In the vehicle seat belt control device according to any one of claims 1 to 4,
With a pull-out amount detection unit that detects the pull-out length of the seat belt when a person fastens the seat belt,
The target tension setting section
A body type estimation means for estimating which body type a person has from among the multiple types of body types from the output of the withdrawal amount detection unit;
A vehicle seat belt control apparatus comprising: a correcting unit that corrects a target tension of the seat belt according to the body shape estimated by the body shape estimating unit.

Images