JP2000052926A - Vehicle occupant restraint system - Google Patents

Abstract

(57) [Problem] To provide a vehicle occupant restraint protection device capable of preventing breakage of a seat belt. SOLUTION: It is determined whether the door is open or closed (step S52). When the door is open, the grace time before the seat belt is retracted is shorter than when the door is closed (step S52). S53, step S54).
It is determined whether the door is open or closed (step S52). When the door is open, the seat belt winding speed is increased, the seat belt winding force is increased, or the seat belt winding is performed. The time interval from the start of winding to the end of winding may be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle occupant restraint system mounted on a vehicle such as an automobile, and more particularly to a vehicle using an electric retractor for winding and pulling out a seat belt for protecting the occupant. The present invention relates to an occupant restraint device.

[0002]

2. Description of the Related Art A vehicle occupant restraint system using an electric retractor for winding and pulling out a seat belt for protecting an occupant is conventionally known.

In the vehicle occupant restraint system, when the occupant pulls out the seat belt in a state in which the seat belt is not fastened, the buckle is difficult to engage with the tongue. Since the drawer is in a stopped state, for example, a predetermined period of time is set assuming the time required for the drawer, and then the seat belt is stored.

[0004] In the seat belt wearing state, for example, when the occupant stops the vehicle once and turns left and right when checking the left and right, the seat belt is pulled out.
In order not to disturb the occupant who is checking and not to disturb the checking, do not wind up with the seat belt pulled out, and then start the vehicle, and when the vehicle speed exceeds the specified vehicle speed, the seat belt Winding was taking place.

[0005]

However, in the former vehicle occupant restraint protection device, the occupant pulls out the seat belt in a non-fastened state, for example, without intending to fasten the seat belt, and immediately goes out of the vehicle. When the door is closed, the seat belt cannot be stored in a short time, so that the seat belt may be pinched by the door and the seat belt may be damaged.

In the latter vehicle occupant restraint protection device, when the vehicle is stopped, for example, a seat belt is pulled out and fastened to fix a load (seat belt fastened state), and the door is closed in that state. In such a case, if the seat belt is unnecessarily loosened, the seat belt may be pinched by the door and may damage the seat belt.

SUMMARY OF THE INVENTION The present invention has been made in view of the above point, and has as its object to provide a vehicle occupant restraint protection device capable of preventing breakage of a seat belt.

[0008]

In order to achieve the above object, a vehicle occupant restraint system according to a first aspect of the present invention includes a door opening / closing detecting means for detecting opening / closing of a door, and stores a seat belt by driving a motor. In the vehicle occupant restraint device to be performed, when the door opening / closing detection means detects that the door is open, the storage of the seat belt is performed faster than when the door is closed. It is characterized by comprising control means for controlling the driving of the motor.

According to the structure of the present invention, when the door is detected to be open, the driving of the motor is controlled so that the seat belt is stored faster than when the door is closed. Therefore, the seat belt is not pinched by the door, and damage to the seat belt can be prevented.

[0010] The control means may control at least one of a rotation speed and a rotation force of the motor.

According to this configuration, the driving of the motor is controlled so that the seat belt is stored quickly based on at least one of increasing the rotational speed of the motor and increasing the rotational force of the motor. The belt is not pinched by the door, and the seat belt can be prevented from being damaged.

The occupant restraint protection device for a vehicle according to the present invention further includes a seat belt wearing detecting means for detecting that the seat belt is worn, and a vehicle backward detecting means for detecting that the vehicle is moving backward. The seat belt wearing detecting means detects the wearing of the seat belt, the door opening / closing detecting means detects that the door is open, and the vehicle backward detecting means detects that the own vehicle is moving backward. If so, the control means may control the driving of the motor so as not to wind up the seat belt.

According to this configuration, when the seat belt is detected to be worn, the door is detected to be opened, and when the vehicle is detected to be moving backward, the seat belt is prevented from being wound up. Since the driving of the motor is controlled, for example, when the vehicle is moved backward for parking with the door open, the seat belt is not wound up, so that the occupant does not feel uncomfortable and the seat belt is worn comfortably. Environment can be provided.

[0014] The vehicle occupant restraint protection device according to claim 1 further includes a seat belt wearing detecting means for detecting that the seat belt is worn, and a vehicle backward detecting means for detecting that the own vehicle is moving backward. The seat belt wearing detecting means detects the wearing of the seat belt, the door opening / closing detecting means detects that the door is open, and the vehicle backward detecting means detects that the own vehicle is moving backward. If not, the control means may control the driving of the motor so as to wind up the seat belt.

According to this configuration, when the seatbelt is detected to be worn, the door is detected to be open, and when it is not detected that the host vehicle is moving backward, the motor is driven so that the seatbelt is wound up. Since the driving is controlled, for example, when the vehicle is stopped, the door is opened, and when the seat belt is pulled out and attached to fix the luggage, the seat belt is wound up, so the seat belt is pinched by the door. It will not hurt.

The occupant restraint protection device for a vehicle according to the present invention further includes a seat belt wearing detecting means for detecting that a seat belt is worn, and a vehicle speed detecting means for detecting a speed of the own vehicle. When the seatbelt is detected by the seatbelt detecting means, the door is detected to be closed by the door opening / closing detecting means, and the speed of the own vehicle detected by the vehicle speed detecting means is lower than a predetermined speed. The control means may control the driving of the motor so as not to wind up the seat belt.

According to this configuration, the seat belt is detected to be worn, the door is detected to be closed, and when the detected speed of the vehicle is lower than the predetermined speed, the seat belt is not wound up. Since the drive of the motor is controlled, for example, when the vehicle is temporarily stopped, the vehicle turns forward for left and right confirmation, and the seat belt is pulled out,
Since the seat belt is not wound up, it is possible to prevent the occupant during the check from feeling uncomfortable and not to obstruct the check.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of an electric retractor 100 provided in a vehicle occupant restraint protection device according to the present embodiment.

The electric retractor 100 has a frame 1. A reel shaft 3 that winds up the seat belt is rotatably mounted on the frame 1, and locks the seat belt when the vehicle is subjected to a predetermined deceleration or when the seat belt is pulled out at a predetermined acceleration. A known seat belt lock mechanism 2 is fixed.

Next, the central axis 3a of the reel shaft 3 is connected to the central axis of the reel shaft pulley 5,
The reel shaft pulley 5 is connected to a DC motor pulley 6 via a power transmission belt 7.

A predetermined number of external teeth are formed on the outer circumference of the pulley 5 for the reel shaft and the pulley 6 for the DC motor, respectively, and a predetermined number of internal teeth are also formed on the inner circumference of the power transmission belt 7. The external teeth of the shaft pulley 5 and the DC motor pulley 6 and the internal teeth of the power transmission belt 7 mesh with each other without excess or deficiency.

The center axis of the DC motor pulley 6 is connected to the DC motor 10. Accordingly, the rotation of the DC motor 10 is controlled via the DC motor pulley 6 by the reel shaft 3.
Is transmitted to

The DC motor 10 is fixed to the frame 1 at at least two points.
1 is connected to an MPU (Micro Processing Unit) 14. The DC motor drive unit 11 controls the rotation of the DC motor 10 based on a control signal from the MPU 14.

The MPU 14 is, for example, H-made by Hitachi.
D6433337YF is used, and as the DC motor 10, for example, DME44SA manufactured by Nippon Servo is used.

FIG. 2 is a circuit diagram of the DC motor drive unit 11. Terminals P1 and P2 in FIG. 2 are input terminals for a PWM (pulse width modulation) signal output from the MPU 14, and a PWM signal of, for example, 20 kHz is input to the terminals P1 and P2. The terminals P3 and P4 are output terminals for current detection, the terminals P5 and P6 are output terminals for voltage detection, and the terminals P1 to P6 are connected to the MPU 14, respectively. The voltage V in FIG.
b is supplied to the DC motor 10, and the plurality of transistors, FETs, and the like in FIG. 2 are for driving the rotation of the DC motor 10 to rotate forward or reverse according to the PWM signal from the MPU 14.

A circuit C1 in FIG. 2 is a current detection circuit for detecting a current i flowing through the DC motor 10 from a current flowing through the resistor r1, and an interface circuit (hereinafter, referred to as an interface circuit) for removing a fluctuation in the current due to the influence of the PWM signal. 1) and IF2. MPU14 is IF1
And a voltage signal from IF2, and detects a current i flowing through the DC motor 10 based on the voltage signal.

The circuit C2 is a voltage measuring circuit for measuring a voltage between terminals applied to the DC motor 10. IF3 and I3 are used to remove fluctuations in terminal voltage due to the influence of the PWM signal.
F4 is provided. The MPU 14 receives voltage signals from IF3 and IF4, respectively, and measures a terminal voltage applied to the DC motor 10 based on the voltage signals.

Each of IF1 to IF4 has a low-pass filter configuration including, for example, a resistor r2, a resistor r3 having a smaller resistance value than the resistor r2, and a capacitor c3, and has a cutoff frequency set to, for example, 20 Hz. As a result, the current detection circuit C 1 and the voltage measurement circuit C 2
4 is reduced to -60 dB, and hardly affects the current that is to be detected by the current detection circuit C1 or the voltage between terminals that is to be measured by the voltage measurement circuit C2.

Returning to FIG. 1, the MPU 14 is provided with a timer 15 for measuring the time, and detects whether or not the tongue of the seat belt is attached to the buckle and whether or not the tongue of the seat belt is detached from the buckle. A buckle connection presence / absence detection unit 16 for detecting, a vehicle reverse detection unit 17 for detecting that the vehicle is traveling backward, a vehicle speed detection unit 18 for detecting the vehicle speed of the vehicle, and a door opening / closing detection unit 19 for detecting opening / closing of the door. Each is connected.

The buckle connection presence / absence detecting section 16 detects whether or not the tongue of the seat belt is attached to the buckle or detects whether or not the tongue of the seat belt is released from the buckle, and sends a corresponding control signal to the MPU 14. Output. The vehicle reverse detection unit 17 detects that the own vehicle is moving backward, outputs a control signal corresponding thereto to the MPU 14, the vehicle speed detection unit 18 detects the speed of the own vehicle, and outputs a control signal corresponding thereto to the MPU 14. Output. The door opening / closing detecting section 19 detects opening / closing of the door, and outputs a control signal corresponding thereto to the MPU 14.

The MPU 14 determines whether or not the seat belt has been pulled out from the voltage between the terminals of the DC motor 10, and determines whether or not the winding of the seat belt has been completed based on the current i flowing through the DC motor 10. Then, the amount of pulling out or winding up of the seat belt is calculated.

FIGS. 3 to 5 are flowcharts showing an example of the control program executed by the MPU 14.

First, it is determined whether or not the buckle connection presence / absence detection unit 16 has detected that the seat belt tongue is attached to the buckle (step S31). If it is detected that the seat belt is worn, the seat belt slack provision control is performed (step S32).

FIG. 6 is a flowchart showing an example of the seat belt slack giving control.

First, by inputting a PWM signal from the MPU 14 to the DC motor drive section 11, the DC motor 10
To the winding side of the seat belt (step S3
21), it is determined from the current flowing through the DC motor 10 whether or not the seat belt is at the winding limit (step S3).
22). Thereby, the improper slack of the seat belt is once completely removed.

If it is determined in step S322 that the seat belt is not at the winding limit, the process returns to step S321.
By inputting the PWM signal from U14 to the DC motor driving unit 11, the DC motor 10 is rotated to the side where the seat belt is pulled out (step S323).
To the seat belt pull-out side, and then
5, it is determined whether or not a predetermined time t1 (for example, 1 s) has elapsed (step S324). Thereby, an appropriate slack of the seat belt is given to the occupant.

If it is determined in step S324 that the predetermined time t1 has not elapsed, the process returns to step S323. If the predetermined time t1 has elapsed, pulling out of the seat belt by the DC motor 10 is stopped (step S325).
This control ends.

Returning to FIG. 3, it is next determined from the voltage between the terminals of the DC motor 10 whether or not the seat belt has been pulled out (step S33). While proceeding to S38,
If the seat belt has been pulled out, it is determined from the voltage between the terminals of the DC motor 10 whether or not the seat belt has been pulled out (step S34). When the seat belt withdrawal is not stopped, the determination is repeated. On the other hand, when the seat belt withdrawal is stopped, the door is opened or closed by a control signal from the door opening / closing detection unit 19. (Step S3)
5).

If the door is closed, it is determined whether the vehicle speed v of the host vehicle is higher than a predetermined value v1 (for example, 10 km / h) (step S36), and the vehicle speed v of the host vehicle is set to the predetermined value v1. If it is larger, the seat belt slack imparting control is performed as in step S32 (step S37).
It is determined whether or not the buckle connection presence / absence detection unit 16 has detected that the tongue of the seat belt is attached to the buckle (step S38).

If the door is open in step S35, it is determined whether or not the host vehicle is moving backward based on a control signal from the vehicle reverse detection unit 17 (step S3).
9) If the vehicle is not moving backward, step S3
Go to 7. Thus, for example, when the door is opened while the vehicle is stopped and the seat belt is pulled out and mounted to fix the luggage, the seat belt is wound up, so that the seat belt is not caught by the door and is not damaged. .

On the other hand, in step S39, when the own vehicle is moving backward, the DC motor 10 is not rotated by inputting the PWM signal from the MPU 14 to the DC motor drive unit 11, that is, the seat belt is wound. Then, the process proceeds to step S38. Thereby, for example, when the occupant opens the door, the seat belt is not wound up when the vehicle is moved backward for parking, so that the occupant does not feel uncomfortable, and a comfortable seat belt wearing environment is provided. be able to.

If it is determined in step S36 that the vehicle speed v of the host vehicle is equal to or lower than the predetermined value v1, the process proceeds to step S40. Thereby, for example, the occupant stops the vehicle once, turns forward to check the left and right, and when the seat belt is pulled out, the seat belt is not wound up, so that the occupant during the check feels uncomfortable. It can be prevented from disturbing confirmation without giving.

In step S38, if the buckle connection detection unit 16 detects that the tongue of the seat belt is attached to the buckle, the process returns to step S33. If it is not detected that the tongue is attached to the buckle, the value of the counter n for counting the number of times the seat belt is wound up to the limit is reset (n ← 0) (step S41), and the PWM signal is output from the MPU 14 to the DC motor. By inputting to the drive unit 11, the DC motor 10 is rotated to the seat belt winding side (step S4).
2) It is determined from the current flowing through the DC motor 10 whether or not the seat belt is at the winding limit (step S4).
3). Thereby, the improper slack of the seat belt is once completely removed.

In step S43, if the seat belt is not at the winding limit, the process returns to step S42, while if the seat belt is at the winding limit, the counter n
Is incremented by 1 (n ← n + 1) (step S
44), the value of the counter n is a predetermined value n1 (for example, three times)
It is determined whether or not this is the case (step S45). Here, it is determined whether or not the value of the counter n is equal to or more than a predetermined value n1 (for example, three times), that is, whether or not the number of times the seat belt is wound up to the limit is, for example, three times or more. The reason for this is to take into account a case where the seat belt is hung on the occupant's arm or the like while the seat belt is being stored and the storage is stopped.

In step S45, if the value of the counter n is smaller than the predetermined value n1, the process returns to step S42. If the value of the counter n is equal to or more than the predetermined value n1, the process returns to step S31.

Returning to step S31, if the buckle connection presence / absence detection unit 16 does not detect that the tongue of the seat belt is attached to the buckle, it is determined whether the seat belt is pulled out from the voltage between the terminals of the DC motor 10. It is determined whether or not the seat belt is pulled out (step S50). If the seat belt is not pulled out, the process returns to step S31. If the seat belt is pulled out, the seat belt is pulled out from the terminal voltage of the DC motor 10. It is determined whether or not the operation has stopped (step S51). When the seat belt withdrawal is not stopped, the determination is repeated. On the other hand, when the seat belt withdrawal is stopped, the door is opened or closed by a control signal from the door opening / closing detection unit 19. Is determined (step S
52).

When the door is open, a predetermined time t2 (for example, 1 s) is waited as a grace period before the seat belt is stored (step S53), and the value of the counter n is reset (n ← 0) (step S55). ), Step S
Proceed to 42. On the other hand, when the door is closed, a predetermined time t3 (for example, 5
s) Waiting (step S54), and the above step S5
Go to 5. Note that the predetermined time t2 is shorter than the predetermined time t3. As a result, even if the occupant does not intend to wear the seat belt and pulls out, immediately goes out of the car and closes the door, the seat belt can be stored and the seat belt is not pinched by the door and is not damaged ,
The seat belt can be prevented from being damaged.

As described above, according to the present embodiment,
At step S52, it is determined whether the door is open or closed. When the door is open, the grace period before the seat belt is stored is shorter than when the door is closed (steps S53 and S54). In addition, the time required from the stoppage of pulling out the seat belt to the end of winding can be shortened, and the seat belt can be prevented from being damaged by being caught by the door, and the seat belt can be prevented from being damaged.

In the present embodiment, whether the door is open or closed is determined in step S52, and the grace period before the seat belt is stored is determined according to the determination result. The seat belt winding speed,
The seat belt winding force or the time interval from the start to the end of winding of the seat belt may be changed. In this case, when the door is open, the winding speed of the seat belt is increased, the winding force of the seat belt is increased, or the time interval from the start of winding the seat belt to the end of winding is shortened.

Thus, the time required from the stoppage of the withdrawal of the seat belt to the end of the winding can be shortened, the seat belt can be prevented from being caught by the door and damaged, and the breakage of the seat belt can be prevented.

[0052]

As described above in detail, according to the vehicle occupant restraint protection system of the first aspect, when it is detected that the door is open, it is compared with when the door is closed.
Since the driving of the motor is controlled so that the seat belt is stored quickly, the seat belt is not pinched by the door, and damage to the seat belt can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an electric retractor 100 provided in a vehicle occupant restraint protection device according to the present embodiment.

FIG. 2 is a circuit diagram of a DC motor driving unit 11;

FIG. 3 is a flowchart illustrating an example of a control program executed by an MPU 14;

FIG. 4 is a flowchart illustrating an example of a control program executed by the MPU 14;

FIG. 5 is a flowchart illustrating an example of a control program executed by the MPU 14;

FIG. 6 is a flowchart illustrating an example of seat belt slack imparting control.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Frame 2 Seat belt lock mechanism 3 Reel shaft 5 Reel shaft pulley 6 DC motor pulley 7 Power transmission belt 10 DC motor 11 DC motor drive unit 14 MPU (control unit) 16 Buckle connection presence / absence detection unit (seat belt attachment detection unit 17) Vehicle reverse detector (vehicle reverse detector) 18 Vehicle speed detector (vehicle speed detector) 19 Door open / close detector (door open / close detector) 100 Electric retractor * +

Claims (1)

[Claims] 1. A vehicle occupant restraint system comprising a door opening / closing detecting means for detecting opening / closing of a door, and storing a seat belt by driving a motor, wherein the door opening / closing detecting means detects that the door is open. A vehicle occupant restraint system comprising a control means for controlling the driving of the motor such that when the door is closed, the seat belt is stored faster than when the door is closed.