JPH0110284Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a passive seat belt device installed in a vehicle, and in particular, a passive seat belt device that increases the safety of occupants in the event of a vehicle collision. It is related to.

[Prior Art] Conventionally, this type of passive seatbelt device has one end of a seatbelt that restrains the chest of an occupant being locked to a retractor device provided on the floor, and the other end of the seatbelt being locked in response to opening and closing of a door. The roof rail section is provided so that it can be moved back and forth, and the seat belt is positioned forward when the door is opened.
It is known that the seat belt is positioned at the rear to restrain the seated occupant while the door is closed (Utility Model Application No. 183022/1983). (see official bulletin).

However, in the above-mentioned conventional passive seat belt device, turning on the door opening/closing switch,
Since the seatbelt is driven when the seatbelt is turned off, in the event of a vehicle collision, if the door is deformed by the impact and the door open/close switch malfunctions, the seatbelt will move forward and protect the occupant. There is a problem in that the restraint by the seat belt is released and the occupant is ejected from the vehicle, causing an accident, and the safety of the occupant cannot be sufficiently ensured in the event of a vehicle collision.

This problem becomes particularly serious when a vehicle is involved in a collision while traveling at high speed.

In this regard, Japanese Patent Application Laid-Open No. 104721/1984 provides a vehicle speed sensor and detects the set vehicle speed (for example, 20km/h).
A technical idea has been disclosed that prevents the passenger from being restrained by the passive seat belt when the time limit h) is exceeded.

However, in the event of a vehicle collision, there may be a situation where the vehicle is still running, for example, with the wheels locked due to sudden braking. In such a case, if the door is deformed by the shock of the collision and the door open/close switch malfunctions, the vehicle speed sensor will have output a signal indicating a vehicle speed lower than the set vehicle speed due to the locked wheels. , the restraint of the passenger by the passive seat belt is released, and there is room for improvement in terms of passenger protection.

[Purpose of the invention] Therefore, when the vehicle is still running with sudden braking applied, the present invention can prevent the door opening/closing switch from malfunctioning due to deformation of the door, etc. Another object of the present invention is to provide a passive seat belt device that can maintain the seat belt in the position where the occupant is restrained, thereby ensuring the safety of the occupant in the event of a collision.

[Structure of the invention] For this reason, the present invention is provided with a vehicle speed sensor that detects whether the vehicle speed is equal to or higher than a set value, and when the vehicle speed becomes equal to or lower than the set value, the drive device detects the output from the vehicle speed sensor. A delay circuit that delays the signal for a set time is used to create a disabling control circuit that is inactive for a predetermined period of time, and in the event of a collision while the vehicle is running at high speed, which is the most dangerous, the occupant is restrained in the seat by the seat belt, and the occupant is prevented from colliding with the occupant. This makes it possible to fully achieve the original purpose of protection over time.

[Effects of the invention] According to the invention, when a passenger feels danger and applies the brakes suddenly, the output is lower than the set vehicle speed even though the tires are locked and the vehicle is still running. Even if a signal is issued, the output signal is delayed for a set time by the delay circuit, so even if the door switch is damaged in the event of a collision and the door switch outputs an open signal, the belt will not move forward. This will further improve safety.

[Example] Hereinafter, the present invention will be described in more detail based on an example shown in the drawings.

In FIGS. 1 and 2, 1 is a vehicle body, 2 is a floor part, 3 is a seat installed on the floor part 2, and 4 is a door. Reference numeral 5 denotes a seatbelt that restrains the chest of the occupant M seated on the seat 3, and the lower end 5a of the seatbelt 5 is locked to a retractor device 6 provided on the floor 2, and the upper end 5b is slidably engaged with the roof rail portion 7. The roof rail portion 7 is attached to the vehicle body 1
The front half extends horizontally, and the rear half extends from the rear end of the front half.
It curves 90 degrees and extends downward. A spiral wire 8 is fitted into the roof rail portion 7, the front end of the spiral wire 8 is connected to the upper edge 5b of the seat belt 5, and the rear end is connected to a wire winding device (not shown). has been done.

9 is a motor that rotates in forward and reverse directions;
A worm 10 is connected to the worm 10 , a worm gear 11 meshes with the worm 10 , and the spiral wire 8 meshes with the worm gear 11 . wire 8
The upper end portion 5b of the seat belt 5 is moved back and forth.

The operation control circuit of the motor 9 includes a door switch 13 that opens and closes in conjunction with the opening and closing of the door 4, a limit switch 14 that opens and closes according to the front and rear end positions of the upper end 5b of the seat belt 5, and a battery 15. As shown in FIG. 1, the door switch 13 is disposed at the opening edge of the door 2 of the vehicle body 1, and has a movable contact 13a and two fixed contacts, a closing contact 13b and an opening contact 13c. The movable contact 13a is connected to the motor 9, the close contact 13b is connected to the positive terminal of the battery 15, and the open contact 13c is connected to the negative terminal of the battery 15. When the door 4 is closed, the movable contact 1
3a is connected to the closing contact 13b, and when the door 4 is opened, the movable contact 13a is switched to be connected to the opening contact 13c. Further, the limit switch 14 has a movable contact 14a arranged at the upper end 5b of the seat belt 5, a front end contact 14b arranged near the front end of the roof rail 7, and a movable contact 14a arranged near the rear end of the roof rail 7. Rear end contact 1
4c, and the movable contact 1
4a is connected to the motor 9, and the front end contact 14b
is connected to the negative terminal of the battery 15, the rear end contact 14c is connected to the positive terminal of the battery 15, and when the upper end 5b of the seat belt 5 reaches the front end position, the movable contact 14a is connected to the front end contact 14b. and the upper end 5b of the seat belt 5
When the movable contact 14a reaches the rear end position, the movable contact 14a is switched to connect to the rear end contact 14c. Therefore, when door 4 is closed,
Movable contact 13a and closing contact 13 of door switch 13
b and the connection between the movable contact 14a and the front end contact 14b of the limit switch 14, the operation control circuit 12 is closed to a forward current circuit, and the motor 9 rotates in the forward direction, thereby moving the spiral wire 8 backward. When the upper end 5b of the seat belt 5 is moved backward and the upper end 5b of the seat belt 5 reaches the rear end position, the movable contact 14a of the limit switch 14 switches to the connection with the rear end contact 14c to control the operation. When the circuit 12 is opened and the motor 9 is stopped, the upper end 5b of the seat belt 5 is held at the rear end position, and when the door 4 is opened, the movable contact 13a and the open contact 13c of the door switch 13 are connected and the limit switch 14 is movable contact 14
a and the rear end contact 14c, the operation control circuit 12 is closed to a reverse flow circuit, and the motor 9 rotates in the reverse direction, thereby moving the spiral wire 8 forward and moving the upper end portion 5b of the seat belt 5 forward. When the upper end 5b of the seat belt 5 reaches the front end position, the movable contact 14 of the limit switch 14
a is switched to connect with the front end contact 14b, the operation control circuit 12 is opened, and the upper end 5b of the seat belt 5 is held at the front end position by stopping the motor 9.

On the other hand, 16 is an operation control circuit 12 for the motor 9.
This disabling circuit disables the seat belt 5 when the vehicle speed exceeds a set value, and even if the door switch 13 is opened due to deformation of the door 4 during a vehicle collision, the seat belt 5 can be held in its restraining position. That's what I do. This disabling circuit 16 is connected to the operation control circuit 12.
A normally closed relay contact 17a connected in series between the open contact 13c of the door switch 13 and the negative terminal of the battery 15 and the relay contact 17a when energized.
A relay 17 consisting of a relay coil 17b for opening the relay, and an npn transistor 18 as a switching element for the relay coil 17b are connected in series with the battery 15', and the positive terminal of the battery 15' and the transistor 18 are connected in series.
A disabling control circuit 19 is connected between the base terminals of the .

This disabling control circuit 19 includes an OR circuit 20 whose output terminal is connected to the base terminal of the transistor 18, and a vehicle speed detection switch 21 is connected to one input terminal of the OR circuit 20 via a delay circuit 22. On the other hand, the inner handle switch 23 is connected to the other input terminal via an inverter 24.

The vehicle speed detection switch 21 is open when the vehicle speed is below a set value (for example, 10 km/h),
This is a switch that closes when the vehicle speed exceeds a set value, and the delay circuit 22 delays the off signal by a set time when the vehicle speed drops below the set value and the vehicle speed detection switch 21 is turned off. It is.

The inner handle switch 23 is a normally open switch that is turned on only when the inner handle (not shown) of the door 4 is operated in the unlock direction, and the inverter 24 at the next stage is operated by the inner handle switch 23. It has the role of inverting the on and off signals. That is, when the inner handle is locked, an ON signal is input to the OR circuit 20, and when the inner handle is unlocked, an OFF signal is input.

Therefore, the output level of the OR circuit 20 is unconditionally set during driving when the vehicle speed exceeds the set value when the vehicle speed detection switch 21 is turned on, or when an unlock operation is performed when the inner handle switch 23 is turned off. In addition to being set to the "1" level, even when the vehicle speed decreases below the set value, the "1" level is maintained from that point until the set time of the delay circuit 22 has elapsed.

In other words, the output level of the OR circuit 20 is "0" only when the set time of the delay circuit 22 has elapsed since the vehicle speed decreased below the set value and the inner handle is unlocked.
level.

The disabling control circuit 19 is configured as described above,
While the output level of the OR circuit 20 is "1", the transistor 18 is made conductive and the relay coil 17b is energized. When the relay contact 17a is opened and the door switch 13 is opened (turned on),
The operation control circuit 12 of the motor 9 is not activated, and the restraint of the occupant by the passive seat belt 5 can be maintained.

Therefore, when the vehicle collides, a door open signal is output from the door switch due to the deformation of the door, and at the same time, the driver suddenly applies the brakes in recognition of danger, at which point the wheels are locked and the vehicle speed detection switch 20 is turned off. Even if the off signal is
Since the relay switch 17a is still held in the OFF state during this time, the occupant can be restrained by the passive seat belt 5, which further improves the protection of the occupant. Become.

Furthermore, although the above description has been made with the Olympic wheels locked, the vehicle speed off signal is delayed for a set time even when the vehicle is overturned and skidding at the time of a collision.

Note that although the disabling circuit 16 in FIG. 3 uses the OR circuit 20 and the inverter 24 to process the vehicle speed signal and the inner handle signal, other logic circuits, such as a sequence discrimination circuit, may be used. .

[Brief explanation of drawings]

FIG. 1 is a perspective view of a seat portion schematically showing a passive seat belt device, and FIG. 2 is an explanatory diagram showing an embodiment of the passive seat belt device according to the present invention.
FIG. 3 is a circuit diagram showing an embodiment of the disabling circuit shown in FIG. 2. 3... Seat, 4... Door, 5... Seat belt, 6... Retractor, 7... Roof rail, 9
...Motor, 12...Operation control circuit, 13...Door switch, 16...Disabling circuit, 19...Disabling control circuit, 21...Vehicle speed detection switch, 22...
...Delay circuit.

Claims (1)

[Scope of utility model registration request] One end of the seatbelt that restrains the occupant's chest is locked to a retractor device installed on the floor.
This is a passive seatbelt device in which the other end moves the roof rail back and forth by a drive device in response to an output signal from a door switch that detects the opening and closing of a door, and a vehicle speed sensor that detects whether the vehicle speed is above a set value. and a disabling control circuit that causes the drive device to be inoperable for a predetermined time by a delay circuit that delays the output signal from the vehicle speed sensor for a set time when the vehicle speed falls below a set value. A characteristic passive seat belt device.