JP3781884B2 - Vehicle occupant restraint protection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle occupant restraint protection device installed in a vehicle such as an automobile, and more particularly to a vehicle occupant restraint protection device using an electric retractor that winds and pulls out a seat belt for protecting the occupant.
[0002]
[Prior art]
BACKGROUND ART A vehicle occupant restraint protection device including an electric retractor for pulling out or winding a seat belt is conventionally known, and the electric retractor includes a motor for driving the electric retractor. The rotation control of the motor is normally or reversely applied by applying constant voltages having different motor polarities as disclosed in Japanese Utility Model Laid-Open No. 61-134464, for example.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional electric retractor, the rotation of the motor is rotated forward or reverse at a constant voltage. Therefore, when the seat belt is stored, the seat belt is suddenly wound by the motor, and the tongue of the seat belt hits the side window glass. The side window glass may be damaged.
[0004]
The present invention has been made paying attention to the above points, and an object of the present invention is to provide a vehicle occupant restraint protection device that can slowly wind up a seat belt.
[0005]
[Means for Solving the Problems]
  The vehicle occupant restraint protection device according to claim 1 is an electric retractor that winds and pulls out a seat belt, a driving unit that drives the electric retractor, and a buckle connection presence / absence detecting unit that detects whether the seat belt is mounted or not. In the vehicular occupant restraint protection device, the buckle connection presence / absence detection means is supplied to the drive means when a buckle release state in which the seat belt is attached to the occupant from the attached state is detected. Control means for controlling the magnitude of the power supply voltage or the pulse width modulation degree of the power supply voltage pulse supplied to the driving means and controlling the electric retractor to wind up the seat belt.The control means reduces the magnitude of the power supply voltage supplied to the driving means immediately after the buckle connection presence / absence detecting means is detected by the buckle connection presence / absence detection means in proportion to the elapsed time after the buckle is released. Characteristic vehicle occupant restraint protection device.
  The vehicle occupant restraint protection device according to claim 2 comprises:In the vehicle occupant restraint protection device, comprising: an electric retractor that winds and pulls out a seat belt; a driving unit that drives the electric retractor; and a buckle connection presence / absence detecting unit that detects whether the seat belt is mounted or not. When the buckle connection presence / absence detecting means detects a buckle release state in which the seat belt is not attached to the occupant, the magnitude of the power supply voltage supplied to the driving means or the driving means is supplied. Control means for controlling the pulse width modulation degree of the power supply voltage pulse and the electric retractor so as to wind up the seat belt, wherein the control means detects the release of the buckle by the buckle connection presence / absence detecting means. Immediately after, the pulse width duty ratio of the power supply voltage pulse supplied to the driving means is changed. And wherein the lowering in proportion to the elapsed time after cycle cancellation.
  The vehicle occupant restraint protection device according to claim 3 is the vehicle occupant restraint protection device according to claim 1, wherein the control means applies the drive means immediately after the release of the buckle is detected by the buckle connection presence / absence detection means. The pulse width duty ratio of the supplied power voltage pulse is set to the elapsed time after the buckle is released.ProportionallyIt is characterized by lowering.
  The vehicle occupant restraint protection device according to claim 4 is the vehicle occupant restraint protection device according to claim 1 or 3, wherein the power supply voltage pulse has a reference frequency other than an audible frequency.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0007]
(1) First embodiment
FIG. 1 is a diagram showing a schematic configuration of a vehicle occupant restraint protection device according to a first embodiment of the present invention.
[0008]
The power input side of the electric retractor 100 that winds and pulls out the seat belt is one end of the contact 18a of the relay 18, the emitter of the transistor 19, a temperature sensor that measures the temperature in the vicinity of the DC motor 10 described later or the temperature of the DC motor 10 itself. The power source input side of 23 and the anode of the diode 17 are connected to each other.
[0009]
The other end of the contact 18 a of the relay 18, one end of the coil 18 b of the relay 18, and the collector of the transistor 19 are connected to the positive terminal of the battery 21, and the other end of the coil 18 b of the relay 18 is connected to one end of the resistor 22. Yes.
[0010]
The other end of the resistor 22 is connected to one end of an ignition switch 20 for starting the engine, and the other end of the ignition switch 20 is grounded. The negative terminal of the battery 21 is grounded.
[0011]
The cathode of the diode 17 detects whether the electric retractor 100, the temperature sensor 23, the ignition switch 20, and the transistor 19 are monitored and controlled, and whether the tongue of the seat belt is attached to the buckle. Each of them is connected to a buckle connection presence / absence detecting unit 15 that outputs an electric signal corresponding to the MPU 14.
[0012]
The MPU 14 is connected to the electric retractor 100, the buckle connection presence / absence detection unit 15, the temperature sensor 23, the ignition switch 20, and the base of the transistor 19.
[0013]
FIG. 2 is a diagram showing an example of a schematic configuration of the electric retractor 100 of FIG.
[0014]
In the figure, the electric retractor 100 includes a frame 1. A reel shaft 3 for winding a seat belt (not shown) is rotatably installed on the frame 1 so that the seat belt is pulled out when a predetermined deceleration is applied to the vehicle or when the seat belt is pulled out at a predetermined acceleration. A known seat belt lock mechanism 2 that locks, that is, stops the rotation of the reel shaft 3 is fixed.
[0015]
The center shaft 3a of the reel shaft 3 is connected to the center shaft of the winding stop gear 4. The winding stop gear 4 rotates in the same direction as the rotation direction of the reel shaft 3, and the winding stop gear 4 is rotated. A predetermined number of external teeth are formed on the outer periphery of the. The surface of the outer gear 4 of the winding stop gear 4 that faces the seat belt in the winding direction is substantially perpendicular to the seat belt, and the surface that faces in the pull-out direction has a gentle slope with respect to the seat belt. It is a surface.
[0016]
The stop arm 8 for stopping the seat belt winding of the winding stop gear 4 is normally urged by a coil spring or the like so as not to stop the seat belt winding, and when the seat belt winding is stopped. It is pushed up by the stop arm drive solenoid 9. As a result, the outer teeth of the take-up stop gear 4 and the stop arm 8 mesh with each other, and the take-up of the seat belt is stopped.
[0017]
When the take-up stop gear 4 rotates in the seat belt pull-out direction, even if the outer teeth of the take-up stop gear 4 and the stop arm 8 are engaged, The seat belt can be pulled out by the tooth configuration.
[0018]
Next, the central shaft 3 a of the reel shaft 3 is connected to the central shaft of the reel shaft pulley 5, and the reel shaft pulley 5 is connected to the DC motor pulley 6 through the power transmission belt 7. An urging force applying means such as a spiral spring is formed inside the reel shaft pulley 5, and the urging force always acts in the direction of winding the seat belt.
[0019]
A predetermined number of external teeth are formed on the outer periphery of each of the reel shaft pulley 5 and the DC motor pulley 6, and a predetermined number of internal teeth are also formed on the inner periphery of the power transmission belt 7. 5 and the external teeth of the DC motor pulley 6 and the internal teeth of the power transmission belt 7 mesh with each other without excess or deficiency.
[0020]
The central axis of the DC motor pulley 6 is connected to the DC motor 10. Accordingly, the rotation of the DC motor 10 is transmitted to the reel shaft 3 via the DC motor pulley 6.
[0021]
The DC motor 10 is fixed to the frame 1 at at least two points, and is electrically connected to the MPU 14 via the DC motor driving unit 11 as described above. The DC motor drive unit 11 controls the rotation of the DC motor 10 based on the electrical signal from the MPU 14.
[0022]
FIG. 3 is a circuit diagram of the DC motor driving unit 11. A circuit C1 in FIG. 3 is a circuit that detects a current that flows through the DC motor 10 from a current that flows through the resistor r1, and a circuit C2 is a circuit that measures the voltage across the terminals of the DC motor 10. Also, the plurality of transistors, FETs, and the like in FIG. 3 are for switching the rotation of the DC motor 10 to normal rotation or inversion by an electric signal from the MPU 14.
[0023]
Returning to FIG. 2, the solenoid drive unit 12 operates the stop arm drive solenoid 9 by an electrical signal from the MPU 14, pushes up the stop arm 8 by the stop arm drive solenoid 9, and the external teeth of the winding stop gear 4 and the stop arm 8. And the winding stop gear 4 is stopped.
[0024]
FIG. 4 is a diagram showing a schematic configuration of another electric retractor 200.
[0025]
The configuration of the electric retractor 200 is different from the configuration of the electric retractor 100 in that the winding stop gear 4, the stop arm 8, the stop arm drive solenoid 9, and the solenoid drive unit 12 are not provided. The configuration of is the same.
[0026]
In the electric retractor 200, the winding of the seat belt is stopped when the DC motor driving unit 11 stops the rotation of the DC motor 10 based on the electric signal from the MPU 14.
[0027]
A control operation executed by the vehicle occupant restraint protection apparatus configured as described above will be described below with reference to FIG.
[0028]
First, when the ignition switch 20 is off, no current flows from the battery 21 to the coil 18b of the relay 18, the contact 18a is turned off, and the power supply voltage is detected from the battery 21 as to whether or not the electric retractor 100, MPU 14 and buckle are connected. It is not supplied to the part 15.
[0029]
Next, when the ignition switch 20 is turned on from the off state, a current flows from the battery 21 to the coil 18b of the relay 18, the contact point 18a is turned on, and the power source voltage is supplied from the battery 21 to the electric retractor 100, MPU 14 and buckle. It is supplied to the connection presence / absence detection unit 15. At this time, the MPU 14 monitors the on / off state of the ignition switch 20 by detecting the voltage applied to the ignition switch 20.
[0030]
Further, the temperature sensor 23 outputs an electrical signal corresponding to the temperature near the DC motor 10 or the temperature of the DC motor 10 itself to the MPU 14, and the buckle connection presence / absence detecting unit 15 detects whether the seat belt tongue is attached to the buckle or the seat belt. Is detected from the buckle and an electrical signal corresponding to the tongue is output to the MPU 14.
[0031]
When the MPU 14 receives an electric signal indicating that the tongue of the seat belt has been released from the buckle from the buckle connection presence / absence detection unit 15, the MPU 14 supplies the power supply voltage represented by the following formula (1) to the DC motor 10 for 3 seconds, for example. In addition, an electric signal is output to the DC motor driving unit 11. As a result, the power supply voltage shown in the following formula (1) is supplied to the DC motor 10. FIG. 5 shows an example of the relationship between the power supply voltage supplied to the DC motor 10 and the elapsed time after the buckle is released.
[0032]
V = VB−k × T × r (1)
V: Supply voltage to DC motor 10
VB: vehicle battery voltage (initial value: 12 V)
k: Control coefficient (example 2.7)
T: Time elapsed since the buckle was released
r: Temperature coefficient
As shown in FIG. 5, the power supply voltage supplied to the DC motor 10 shown in Expression (1) gradually decreases in proportion to the elapsed time after the buckle is released.
[0033]
After that, the MPU 14 does not supply the power supply voltage to the DC motor 10 for 1.9 seconds, supplies the power supply voltage of 4V to the DC motor 10 for the next 0.1 second, and supplies the power supply voltage to the DC motor 10 again for 1.9 seconds. An electrical signal of 1 cycle for 2 seconds is output to the DC motor drive unit 11 until the ignition switch 20 is turned off. As a result, the power supply voltage supplied to the DC motor 10 is 0V for 1.9 seconds, 4V for the next 0.1 seconds, and again 0V for 1.9 seconds, as shown in FIG. Therefore, a DC power supply voltage of 4 V is supplied to the DC motor 10 in one cycle for 2 seconds, of which 0.1 V is included.
[0034]
Since the seat belt is slowly wound by the control of the MPU 14, when the seat belt is stored by continuously supplying the power supply voltage of a predetermined value to the DC motor 10 and storing the seat belt, the seat belt is moved by the DC motor 10. The problem that the seatbelt tongue hits the side window glass and breaks the side window glass can be solved.
[0035]
Next, when the ignition switch 20 is turned from on to off, no current flows from the battery 21 to the coil 18b of the relay 18, and the contact 18a is turned off with a delay of, for example, 10 ms, and the electric retractor 100, Supply of the power supply voltage to the MPU 14 and the buckle connection presence / absence detection unit 15 is stopped.
[0036]
As described above, according to the first embodiment of the present invention, the MPU 14 controls the power supply voltage supplied to the DC motor 10 for the first 3 seconds after the buckle is released to the elapsed time after the buckle is released. The voltage gradually decreases from 12V in proportion to 0V for the next 1.9 seconds, then to 4V for the next 0.1 seconds, and then for 1 second for 2 seconds, of which the power supply is 4V for 0.1 seconds. Since the voltage is supplied to the DC motor 10, the power supply voltage of a predetermined value is continuously supplied to the DC motor 10 as in the prior art, and when the seat belt is stored, the seat belt is rapidly wound by the DC motor 10. Therefore, the problem that the tongue of the seat belt hits the side window glass and damages the side window glass can be solved, and the seat belt can be wound up slowly.
[0037]
(2) Second embodiment
The schematic configuration of the vehicle occupant restraint protection device according to the second embodiment of the present invention is the same as the schematic configuration of the vehicle occupant restraint protection device according to the first embodiment, and the electric retractors 100 and 200 are the same. This is the same as the schematic configuration and the circuit configuration of the DC motor drive unit 11.
[0038]
Compared with the vehicle occupant restraint protection device according to the first embodiment, the vehicle occupant restraint protection device according to the second embodiment of the present invention is an MPU 14 for supplying a power supply voltage to the electric retractor 100. The control method is different.
[0039]
Hereinafter, the control operation executed by the vehicle occupant restraint protection apparatus will be described with reference to FIG.
[0040]
First, when the ignition switch 20 is off, no current flows from the battery 21 to the coil 18b of the relay 18, the contact 18a is turned off, and the power supply voltage is detected from the battery 21 as to whether or not the electric retractor 100, MPU 14 and buckle are connected. It is not supplied to the part 15.
[0041]
Next, when the ignition switch 20 is turned on from the off state, a current flows from the battery 21 to the coil 18b of the relay 18, the contact point 18a is turned on, and the power source voltage is supplied from the battery 21 to the electric retractor 100, MPU 14 and buckle. It is supplied to the connection presence / absence detection unit 15. At this time, the MPU 14 monitors the on / off state of the ignition switch 20 by detecting the voltage applied to the ignition switch 20.
[0042]
Further, the temperature sensor 23 outputs an electrical signal corresponding to the temperature near the DC motor 10 or the temperature of the DC motor 10 itself to the MPU 14, and the buckle connection presence / absence detecting unit 15 detects whether the seat belt tongue is attached to the buckle or the seat belt. Is detected from the buckle, and an electric signal corresponding to the tongue is output to the MPU 14.
[0043]
When the MPU 14 receives an electrical signal indicating that the tongue of the seat belt has been released from the buckle from the buckle connection presence / absence detection unit 15, the MPU 14 supplies a predetermined power supply voltage from the battery 21 to the DC motor 10. An on / off electrical signal having a duty ratio of 20 kHz and represented by the following formula (2) is output to the DC motor driving unit 11 for 3 seconds. As a result, the DC motor 10 is supplied with a power supply voltage having a predetermined value corresponding to an on / off electrical signal having a duty ratio represented by the following equation (2). FIG. 6A shows an example of the relationship between the duty ratio of the on / off electrical signal supplied to the DC motor driving unit 11 and the elapsed time after the buckle is released, and FIG. 6B shows the buckle release. It is a figure which shows the duty ratio of the on / off electric signal supplied to the DC motor drive part 11 until 3 second passes after.
[0044]
D = 100−a × T × r (2)
D: Duty ratio
a: Control coefficient (example 23.3)
T: Time elapsed since the buckle was released
r: Temperature coefficient
As shown in FIG. 6, the duty ratio of the on / off electrical signal supplied to the DC motor driving unit 11 shown in Expression (2) gradually decreases in proportion to the elapsed time after the buckle is released.
[0045]
Thereafter, as shown in FIG. 6, the MPU 14 sets the duty ratio to 0% for 1.9 seconds, sets the duty ratio to 30% for the next 0.1 seconds, and then sets the duty ratio to 0% again for 1.9 seconds. In one cycle for 2 seconds, an ON / OFF electric signal with a duty ratio of 30% is output to the DC motor drive unit 11 until the ignition switch 20 is turned off.
[0046]
As a result, the power supply voltage is not supplied to the DC motor 10 for 1.9 seconds, and the power supply voltage of a predetermined value corresponding to the on / off electrical signal with the duty ratio of 30% is supplied to the DC motor 10 for the next 0.1 second. A power supply voltage of a predetermined value corresponding to an on / off electrical signal with a duty ratio of 30% is included in one cycle for 2 seconds in which the power supply voltage is not supplied to the DC motor 10 again for 1.9 seconds. The DC motor 10 is supplied.
[0047]
Since the seat belt is slowly wound by the control of the MPU 14, when the seat belt is stored and the seat belt is stored by continuously supplying a power supply voltage of a predetermined value to the DC motor 10, the seat belt is driven by the DC motor 10. The problem that the seatbelt tongue hits the side window glass and breaks the side window glass can be solved.
[0048]
Next, when the ignition switch 20 is turned from on to off, no current flows from the battery 21 to the coil 18b of the relay 18, and the contact 18a is turned off with a delay of, for example, 10 ms, and the electric retractor 100, Supply of the power supply voltage to the MPU 14 and the buckle connection presence / absence detection unit 15 is stopped.
[0049]
As described above, according to the second embodiment of the present invention, the MPU 14 controls the duty ratio that gradually decreases in proportion to the elapsed time from the release of the buckle for the first 3 seconds after the release of the buckle. A power supply voltage having a predetermined value corresponding to the on / off electrical signal is supplied to the DC motor 10, the power supply voltage is not supplied to the DC motor 10 for the next 1.9 seconds, and the duty ratio is set to 30 for the next 0.1 seconds. A power supply voltage having a predetermined value corresponding to the ON / OFF electrical signal of% is supplied to the DC motor 10 and is again supplied to the DC motor 10 for 1.9 seconds in one cycle of 2 seconds, of which 0.1% Since a power supply voltage having a predetermined value corresponding to an on / off electrical signal having a duty ratio of 30% per second is supplied to the DC motor 10, the power supply voltage having a predetermined value is continuously supplied to the DC motor 10 as in the past. Shi When retracting the seat belt, the problem that the seat belt is abruptly wound by the DC motor 10 and the tongue of the seat belt hits the side window glass and damages the side window glass can be solved, and the seat belt can be wound slowly. it can.
[0050]
(3) Third embodiment
The schematic configuration of the vehicle occupant restraint protection device according to the third embodiment of the present invention is the same as the schematic configuration of the vehicle occupant restraint protection device according to the first embodiment, and the electric retractors 100 and 200 are the same. This is the same as the schematic configuration and the circuit configuration of the DC motor drive unit 11.
[0051]
The vehicle occupant restraint protection device according to the third embodiment of the present invention differs from the vehicle occupant restraint protection device according to the first embodiment in the timing at which the power supply voltage is supplied to the electric retractor 100. .
[0052]
A control operation executed by the vehicle occupant restraint protection apparatus configured as described above will be described below with reference to FIG.
[0053]
First, when the ignition switch 20 is off, no current flows from the battery 21 to the coil 18b of the relay 18, the contact 18a is turned off, and the power supply voltage is detected from the battery 21 as to whether or not the electric retractor 100, MPU 14 and buckle are connected. It is not supplied to the part 15.
[0054]
Next, when the ignition switch 20 is turned on from the off state, a current flows from the battery 21 to the coil 18b of the relay 18, the contact point 18a is turned on, and the power source voltage is supplied from the battery 21 to the electric retractor 100, MPU 14 and buckle. It is supplied to the connection presence / absence detection unit 15. At this time, the MPU 14 monitors the on / off state of the ignition switch 20 by detecting the voltage applied to the ignition switch 20.
[0055]
Thereafter, when the ignition switch 20 is turned off from on, no current flows from the battery 21 to the coil 18b of the relay 18, and the contact 18a is turned off with a delay of 10 ms, for example, and the electric retractor 100, MPU 14 and Supply of the power supply voltage to the buckle connection presence / absence detection unit 15 is stopped.
[0056]
At the same time as the ignition switch 20 is turned off, the MPU 14 outputs a high level signal to the base of the transistor 19 to turn on the transistor 19, and the power supply voltage is detected from the battery 21 via the transistor 19 from the battery 21 to the presence or absence of the electric retractor 100, MPU 14 and buckle connection. Supplied to the unit 15.
[0057]
Next, the temperature sensor 23 outputs an electrical signal corresponding to the temperature near the DC motor 10 or the temperature of the DC motor 10 itself to the MPU 14, and the buckle connection presence / absence detecting unit 15 detects whether the seat belt tongue is attached to the buckle or the seat belt. Is detected from the buckle, and an electric signal corresponding to the tongue is output to the MPU 14.
[0058]
When the MPU 14 receives an electrical signal indicating that the tongue of the seat belt has been released from the buckle from the buckle connection presence / absence detection unit 15, the MPU 14 supplies the power supply voltage represented by the following formula (3) to the DC motor 10 for 3 seconds, for example. In addition, an electric signal is output to the DC motor driving unit 11. As a result, the power supply voltage shown in the following formula (3) is supplied to the DC motor 10. FIG. 5 shows an example of the relationship between the power supply voltage supplied to the DC motor 10 and the elapsed time after the buckle is released.
[0059]
V = VB−k × T × r (3)
V: Supply voltage to DC motor 10
VB: vehicle battery voltage (initial value: 12 V)
k: Control coefficient (example 2.7)
T: Time elapsed since the buckle was released
r: Temperature coefficient
As shown in FIG. 5, the power supply voltage supplied to the DC motor 10 shown in Expression (3) gradually decreases in proportion to the elapsed time after the buckle is released.
[0060]
After that, the MPU 14 does not supply the power supply voltage to the DC motor 10 for 1.9 seconds, supplies the power supply voltage of 4V to the DC motor 10 for the next 0.1 second, and supplies the power supply voltage to the DC motor 10 again for 1.9 seconds. An electrical signal of 1 cycle for 2 seconds is output to the DC motor drive unit 11 until a time required for winding the seat belt, for example, 1 minute elapses. As a result, the power supply voltage supplied to the DC motor 10 is 0V for 1.9 seconds, 4V for the next 0.1 seconds, and again 0V for 1.9 seconds, as shown in FIG. Therefore, a DC power supply voltage of 4 V is supplied to the DC motor 10 in one cycle for 2 seconds, of which 0.1 V is included.
[0061]
Since the seat belt is slowly wound by the control of the MPU 14, when the seat belt is stored by continuously supplying the power supply voltage of a predetermined value to the DC motor 10 and storing the seat belt, the seat belt is moved by the DC motor 10. The problem that the seatbelt tongue hits the side window glass and breaks the side window glass can be solved.
[0062]
Next, after the MPU 14 outputs a high level signal to the base of the transistor 19 and turns the transistor 19 on, after a predetermined time has elapsed, that is, after the time when the electric retractor 100 winds up the seat belt, the MPU 14 sends a low level signal to the base of the transistor 19. Is output to turn off the transistor 19. Thereby, supply of the power supply voltage from the battery 21 to the electric retractor 100, the MPU 14, and the buckle connection presence / absence detection unit 15 is stopped.
[0063]
As a result, when it is not necessary to supply the power supply voltage to the electric retractor 100, the power supply voltage is supplied from the battery 21 and is not consumed, and the battery 21 can be prevented from deteriorating. In addition, since the seat belt is wound up after the seat belt is attached and detached, the tongue of the seat belt is not caught and damaged by the door.
[0064]
As described above, according to the third embodiment of the present invention, the MPU 14 controls the power supply voltage supplied to the DC motor 10 for the first 3 seconds after the buckle is released to the elapsed time after the buckle is released. The voltage gradually decreases from 12V in proportion to 0V for the next 1.9 seconds, then to 4V for the next 0.1 seconds, and then for 1 second for 2 seconds, of which the power supply is 4V for 0.1 seconds. Since the voltage is supplied to the DC motor 10, the power supply voltage of a predetermined value is continuously supplied to the DC motor 10 as in the prior art, and when the seat belt is stored, the seat belt is rapidly wound by the DC motor 10. Therefore, the problem that the tongue of the seat belt hits the side window glass and damages the side window glass can be solved, and the seat belt can be wound up slowly.
[0065]
The voltage value supplied to the DC motor 10 shown in the first to third embodiments, the elapsed time after the buckle is released, and the duty of the on / off electrical signal supplied to the DC motor driving unit 11 The ratio is an example and is not limited thereto.
[0066]
Further, the vehicle occupant restraint protection device shown in the first to third embodiments can be used for any of a driver's seat, a passenger seat, and a rear seat.
[0067]
【The invention's effect】
  As explained in detail above,According to the present invention, the control means detects the magnitude of the power supply voltage supplied to the drive means or the pulse width duty of the power supply voltage pulse supplied to the drive means immediately after the release of the buckle is detected by the buckle connection presence / absence detection means. Decrease the ratio in proportion to the time elapsed since the buckle was releasedTherefore, as in the prior art, when the power supply voltage of a predetermined value is continuously supplied to the driving means and the seat belt is stored, the seat belt is rapidly wound by the driving means, and the tongue of the seat belt hits the side window glass. The problem of damaging the side window glass can be solved, and the seat belt can be wound up slowly.Further, since the seat belt is wound up after the seat belt is attached and detached, there is an effect that the tongue of the seat belt is not sandwiched between the doors and is not damaged.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a vehicle occupant restraint protection device according to a first embodiment of the present invention.
FIG. 2 is a diagram showing an example of a schematic configuration of the electric retractor 100 of FIG.
FIG. 3 is a circuit diagram of the DC motor driving unit 11;
4 is a diagram showing a schematic configuration of another electric retractor 200. FIG.
FIG. 5 is a diagram illustrating an example of a relationship between a power supply voltage supplied to the DC motor and an elapsed time after the buckle is released.
6A is a diagram illustrating an example of a relationship between a duty ratio of an on / off electrical signal supplied to the DC motor driving unit 11 and an elapsed time after the buckle is released; FIG. These are figures which show the duty ratio of the on / off electric signal supplied to the DC motor drive part 11 until 3 second passes after buckle cancellation | release.
[Explanation of symbols]
1 frame
2 Seat belt lock mechanism
3 Reel shaft
4 Winding stop gear
5 Pulley for reel shaft
6 Pulley for DC motor
7 Power transmission belt
8 Stop arm
9 Stop arm drive solenoid
10 DC motor (drive means)
11 DC motor drive
14 MPU (control means)
100 electric retractor

Claims (4)

In a vehicle occupant restraint protection device comprising: an electric retractor that winds and pulls out a seat belt; a driving unit that drives the electric retractor; and a buckle connection presence / absence detecting unit that detects whether the seat belt is attached or not.
When the buckle connection presence / absence detecting means detects a buckle release state in which the seat belt is attached to the occupant from a non-wearing state, the magnitude of the power supply voltage supplied to the driving means or the driving means Control means for controlling the pulse width modulation degree of the supplied power supply voltage pulse and controlling the electric retractor to wind up the seat belt ;
The control means reduces the magnitude of the power supply voltage supplied to the drive means immediately after the buckle connection presence / absence detecting means is detected by the buckle connection presence / absence detection means in proportion to the elapsed time after the buckle is released. An occupant restraint protection device for vehicles . In a vehicle occupant restraint protection device comprising: an electric retractor that winds and pulls out a seat belt; a driving unit that drives the electric retractor; and a buckle connection presence / absence detecting unit that detects whether the seat belt is attached or not.
When the buckle connection presence / absence detecting means detects a buckle release state in which the seat belt is attached to the occupant from a non-wearing state, the magnitude of the power supply voltage supplied to the driving means or the driving means Control means for controlling the pulse width modulation degree of the supplied power supply voltage pulse and controlling the electric retractor to wind up the seat belt;
The control means decreases the pulse width duty ratio of the power supply voltage pulse supplied to the drive means in proportion to the elapsed time from the release of the buckle immediately after the buckle connection presence / absence detection means is detected. An occupant restraint protection device for a vehicle. The control means decreases the pulse width duty ratio of the power supply voltage pulse supplied to the drive means in proportion to the elapsed time from the release of the buckle immediately after the buckle connection presence / absence detection means is detected. The vehicle occupant restraint protection device according to claim 1.   4. The vehicle occupant restraint protection device according to claim 1, wherein a reference frequency of the power supply voltage pulse is other than an audible frequency. 5.

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