JP4797408B2 - Seat belt control device - Google Patents

Description

  The present invention relates to a seat belt control device in which a child seat is fixed to a seat by a seat belt webbing for restraining an occupant.

  The seatbelt control device that fixes the child seat to the seat with occupant restraint seatbelt webbing, the child seat switch operation, the winding of the webbing by the seatbelt retractor is combined with a small winding force mode by a spring mechanism, and a reduction gear There is known one that switches between a large winding force mode by a motor that has been used (see, for example, Patent Document 1).

In this seat belt control device, when restraining an occupant with seat belt webbing, a small winding force mode is set without pressing the child seat switch, while when a child seat is fixed, a large winding force is obtained by pressing the child seat switch. As a mode, the child seat can be securely fixed to the seat with a large tension of the seat belt webbing.
Japanese Patent Laid-Open No. 2001-97185 (pages 2, 3 and 1, 2)

  However, in such a conventional seat belt control device, when a child seat is attached, it may be considered that the user forgets to press the child seat switch and wears the seat belt webbing.

  However, even if you forget to press the child seat switch in this way, the seat belt webbing has a small winding force, but the child seat can be temporarily fixed. For this reason, the child seat is fixed to the seat with a small tension of the seat belt webbing, and a necessary fixing force cannot be obtained.

  Therefore, the present invention detects whether the object existing on the seat is an occupant or a child seat, and automatically controls the tension of the seat belt webbing to ensure that the occupant and the child seat are at a tension suitable for each. The present invention provides a seat belt control device that can be restrained.

In the present invention, a seat belt control device including a seat belt device for fixing a child seat to a seat with a seat belt webbing for restraining an occupant,
An object detection means for detecting whether the object existing on the seat is an occupant or a child seat;
Tension variable means for controlling the tension of the seat belt webbing according to the occupant or child seat on the seat based on the detection result of the object detection means,
When the object on the seat is an occupant, the tension variable means generates a first tension to remove the slack of the seat belt webbing, and when the object is a child seat, the first tension The seat belt webbing is retracted according to the object that has existed on the seat when the restraint of the seat belt is released. Change the start time ,
The seat belt webbing storage start time is set to zero when the object is an occupant, and is set to the time required to remove the seat belt webbing from the child seat when the object is a child seat. Main features.

  According to the present invention, the object detecting means detects the object present on the seat, and the tension changing means can control the tension of the seat belt webbing according to the occupant or child seat on the seat. The tension can be automatically set according to the occupant or the child seat, and each can be reliably restrained with an appropriate tension.

  In addition, since the object detection means can detect whether the object existing on the seat is an occupant or a child seat, the switch for artificially selecting the object to be attached to the seat can be eliminated, and the seat The belt webbing tension can be properly controlled without malfunction.

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

  1 to 4 show an embodiment of a seat belt control device according to the present invention, FIG. 1 is an overall configuration diagram schematically showing the seat belt control device, and FIG. 2 is an explanation showing a control flowchart when the seat belt is mounted. FIG. 3 is an explanatory diagram showing a control flowchart when the seat belt is stored, and FIG. 4 is an explanatory diagram showing a control flowchart when the alarm mode is activated.

  As shown in FIG. 1, in the seat belt control device 100 of the present embodiment, a detection sensor 111 as an object detection unit is provided on a seat 110, and an object existing on the seat 110 is an occupant by the detection sensor 111. Or a child seat.

  In addition, a seat belt buckle switch 120 that detects attachment / detachment of a buckle and a tongue (not shown) of the seat belt, and a seat belt webbing 130 that restrains and fixes the occupant or child seat as the object to the seat 110 are provided.

  A seat belt retractor 140 is provided as tension changing means for controlling the tension of the seat belt webbing 130 according to the passenger or child seat on the seat 111 based on the detection result of the detection sensor 111.

  The seat belt retractor 140 receives vehicle information 150 such as a detection signal of the detection sensor 111, a seat belt wearing signal of the seat belt buckle switch 120, a vehicle speed signal and an ignition signal, and applies the vehicle information 150 to the seat belt webbing 130. A controller 141 that determines tension, a winding mechanism 142 that winds and unwinds the seat belt webbing 130, and driving means that drives the winding mechanism 142 with a driving torque according to the tension determination result by the controller 141. The motor 143 is provided.

  At this time, when the object on the seat 110 is an occupant, the seat belt retractor 140 generates a first tension (for example, about 10 N) that removes the slack of the seat belt webbing 130, for example. When the object is a child seat, a second tension (for example, about 150 N) is generated so that the child seat can be securely fixed.

  That is, the above-described winding control of the seat belt webbing 130 by the seat belt retractor 140 is executed based on the flowchart shown in FIG. 2, and first, when the control is started by turning on the ignition switch in step S10. After the initial value of the CS (child seat) flag is set to 0 in step S11, it is confirmed in step S12 and step S14 whether the object existing on the seat 110 is an occupant or a child seat. .

  In step S12, it is determined whether an occupant is seated on the seat 110. If it is determined that the occupant is seated (YES), the CS flag is set to 1 in step S13, and then the occupant is determined in step S12. When it is determined that the user is not seated (NO), the process proceeds to step S14.

  Step S14 determines whether or not a child seat (CS) exists on the seat 110. If it is determined that a child seat exists (YES), the CS flag is set to 2 in step S15, and then a child seat exists in step S14. If it is determined not to proceed (NO), the process proceeds to step S16.

  In step S16, it is confirmed from the signal of the seat belt buckle switch 120 whether or not the seat belt webbing 130 is attached. If not (NO), the processes in steps S12 to S15 are repeated until the attachment is confirmed. It is.

  If it is confirmed that the seat belt webbing 130 is attached in step S16 (YES), the tension for winding the seat belt webbing 130 is determined in steps S18 to S22 through step S17.

  In step S17, it is determined whether or not the seat belt webbing 130 is already in the mounted state to prevent the seat belt from being pulled twice. If it is determined that the seat belt is already in the mounted state (NO), step S17 is performed. Proceeding to S23, the winding control of the seat belt webbing 130 is completed.

  On the other hand, if the seat belt webbing 130 is attached from the non-attached state in step S17 (YES), the process proceeds to step S18. If it is determined that the CS flag is 0 (YES), there is an object on the seat 110. This is a case of not (vacant seat), and the process proceeds to step S23 without performing the winding operation, and the winding control of the seat belt webbing 130 is completed.

  If the CS flag is not 0 in step S18 (NO), the process proceeds to step S19. If it is determined that the CS flag is 1 (YES), it is determined that the occupant is seated on the seat 110. In step S20, the motor 143 is driven so that the first tension (about 10 N) is generated on the seat belt webbing 130, and then the process proceeds to step S23 to complete the winding control.

  On the other hand, if it is determined in step S19 that the CS flag is not 1 (NO), the process proceeds to step S21. If it is determined that the CS flag is 2 (YES), it is determined that a child seat is installed on the seat 110. Then, after driving the motor 143 so that the second tension (about 150 N) is generated in the seat belt webbing 130 in step S22, the step is the same as in the case where it is determined in step S21 that the CS flag is not 2 (NO). Proceeding to S23, the winding control is completed.

  By the way, in the seatbelt control apparatus 100 of the present embodiment, the seatbelt retractor 140 is configured so that when the restraint of the seatbelt is released, the seatbelt webbing 130 of the seatbelt webbing 130 is changed according to the object that has existed on the seat 110 until then. The storage operation start time is changed.

  At this time, the storage operation start time of the seat belt webbing 130 is set to zero when the object is an occupant, and is set to a time required to remove the seat belt webbing 130 from the child seat when the object is a child seat. It is.

  The retracting operation of the seat belt webbing 130 is performed when the vehicle is stopped.

  That is, the restraint release control of the seat belt by the seat belt retractor 140 described above is executed based on the flowchart shown in FIG. 3. First, when the control is started by turning on the ignition switch in step S30, If it is detected in S31 that the seat belt webbing 130 has been released from the mounted state (YES), the stop state of the vehicle is confirmed in step S32.

  The stop state of the vehicle is determined from the input vehicle speed signal, and is set to determine that the vehicle speed is less than 3 km / hr and the vehicle is stopped. When the vehicle speed is 3 km / hr or more (NO), 3 km / If the vehicle speed reaches less than 3 km / hr (YES), the state of the CS flag is confirmed in step S33, and if the CS flag is 2 (YES), the child seat is attached to the seat 110. Is installed, the process proceeds to step S34 to activate the timer.

  The timer executed in step S34 is set to a time required to remove the seat belt webbing 130 from the child seat, for example, 10 seconds. After waiting for 10 seconds in step S34, the process proceeds to step S35 to drive the motor 143. Then, the seat belt webbing 130 starts to be stored via the winding mechanism 142.

  On the other hand, if it is determined in step S33 that the CS flag is not 2 (NO), the occupant is seated on the seat 110 or there is no occupant or child seat. In this case, the timer is activated. Without jumping directly to step S35, the seat belt webbing 130 starts to be stored.

  After instructing the storage of the seat belt webbing 130 in step S35, the process proceeds to step S36 to complete a series of seat belt storage control.

  Incidentally, FIG. 4 is a flowchart for executing an alarm mode in which when an occupant sits on the seat 110 and wears a seat belt, an abnormality is notified to the occupant by a change in the tension of the seat belt webbing 130. First, when control is started by turning on the ignition switch in step S40, it is determined in step S41 whether an alarm mode has been issued.

  As an alarm mode in this case, it is possible to appropriately select and specify an abnormal state such as poor seat belt attachment, excessive speed, and a half-open state of the door or forgetting to turn off the light.

  If it is determined in step S41 that the alarm mode operation determination has been turned ON (YES), it is determined in step S42 whether the CS flag is 1, and a passenger is seated on the seat 110 (YES). Only proceeds to step S43.

  In step S43, an alarm is activated by driving the motor 143. This alarm is activated by causing the motor 143 to rotate forward and reverse in a short time, thereby giving a vibrational tension change to the seat belt webbing 130. A warning is provided.

  With the above configuration, according to the seatbelt control apparatus of the present embodiment, the detection sensor 111 that detects whether the object existing on the seat 110 is an occupant or a child seat is provided, and the detection sensor is detected by the seatbelt retractor 140. Since the tension of the seat belt webbing 130 is controlled according to the occupant or child seat on the seat 111 based on the detection result 111, each of the occupant and the child seat can be reliably restrained with an appropriate tension.

  In addition, since the detection sensor 111 can detect whether the object existing on the seat 110 is an occupant or a child seat, a switch for artificially selecting an object to be attached to the seat 110, for example, a conventional child seat switch is provided. The tension of the seat belt webbing 130 can be appropriately controlled without malfunction.

  The seat belt retractor 140 receives a detection signal from the detection sensor 111, a seat belt wearing signal from the seat belt buckle switch 120, and vehicle information 150, and determines a tension applied to the seat belt webbing 130. 141, a winding mechanism 142 that winds and unwinds the seat belt webbing 130, and a motor 143 that drives the winding mechanism 142 with a driving torque according to a result of tension determination by the controller 141. Therefore, the tension determined by the controller 141 can be accurately applied to the seat belt webbing 130, and the occupant or child seat can be reliably restrained and fixed to the seat 110.

  Further, when the object on the seat 110 is an occupant, the seat belt retractor 140 generates a first tension (e.g., about 10 N) enough to remove the slack of the seat belt webbing 130 and the object. Is a child seat, a second tension (for example, about 150 N) is generated so that the child seat can be securely fixed, so that the passenger can be restrained with an appropriate first tension without excessive tightening. The child seat can be firmly fixed to the child seat with a large second tension, and problems such as loosening of the seat belt webbing 130 during traveling can be prevented.

  Further, the seat belt retractor 140 changes the storage operation start time of the seat belt webbing 130 according to the object that has been present on the seat 110 until the restraint of the seat belt is released. The removal time of the seat belt webbing differs depending on whether it is an occupant or a child seat, but the storage operation start time can be set according to each removal time, so even if the object is different, the seat belt webbing 130 Removal can be performed smoothly.

  Further, the retracting operation start time of the seat belt webbing 130 is set to zero when the object is an occupant, and is set to a time required to remove the seat belt webbing 130 from the child seat when the object is a child seat. Therefore, when the occupant is restrained by the seat belt webbing 130, the detachment is easily performed by releasing the engagement between the buckle and the tongue. Therefore, the storing operation is started simultaneously with the output of the separation signal of the seat belt buckle switch 120. By doing so, the seat belt webbing 130 can be stored smoothly.

  On the other hand, when the child seat is fixed by the seat belt webbing 130, it takes time to remove the seat belt webbing 130 because the seat belt webbing 130 is attached to the child seat, and therefore the storage operation start time is set as the seat belt webbing 130. By setting the time required to remove the child seat, the child seat can be easily removed.

  Further, since the retracting operation of the seat belt webbing 130 is performed while the vehicle is stopped, the retracting operation of the seat belt webbing 130 can be performed safely.

  By the way, although this invention was demonstrated taking the example for the said embodiment, various other embodiment can be employ | adopted in the range which is not restricted to this embodiment and does not deviate from the summary of this invention.

1 is an overall configuration diagram schematically illustrating a seat belt control device according to an embodiment of the present invention. It is explanatory drawing which shows the control flowchart at the time of seatbelt mounting in one Embodiment of this invention. It is explanatory drawing which shows the control flowchart at the time of seatbelt accommodation in one Embodiment of this invention. It is explanatory drawing which shows the control flowchart at the time of the alarm mode action | operation in one Embodiment of this invention.

Explanation of symbols

100 seat belt control device 110 seat 111 detection sensor (object detection means)
120 Seat belt buckle switch 130 Seat belt webbing 140 Seat belt retractor (Tension variable means)
141 Controller 142 Winding mechanism 143 Motor (driving means)
150 Vehicle information

Claims (3)

A seat belt control device including a seat belt device for fixing a child seat to a seat with a seat belt webbing for restraining an occupant,
And the object detecting means for an object present on the sheet is detected whether a child seat or a passenger,
The tension of the seat belt webbing on the basis of the detection result of the object detecting means, and a tension varying means for controlling in response to the occupant or a child seat on the seat,
When the object on the seat is an occupant, the tension variable means generates a first tension to remove the slack of the seat belt webbing, and when the object is a child seat, the first tension The seat belt webbing is retracted according to the object that has existed on the seat when the restraint of the seat belt is released. Change the start time ,
The seat belt webbing storage start time is set to zero when the object is an occupant, and set to a time required to remove the seat belt webbing from the child seat when the object is a child seat. A seat belt control device. The tension varying means is a controller for determining a tension to be applied to the seat belt webbing by inputting a detection signal of the object detection means and other necessary information;
A winding mechanism for winding and unwinding the seat belt webbing;
The seat belt control device according to claim 1, further comprising: a driving unit that drives the winding mechanism with a driving torque according to a tension determination result by the controller. The seatbelt control device according to claim 1 or 2 , wherein the storing operation of the seatbelt webbing is executed when the vehicle is stopped.

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