JP2917804B2 - Vehicle safety devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle occupant protection system. In particular, the present invention relates to an airbag system for inflating an airbag provided in a seat in a vehicle emergency, and a vehicle safety device including a preloader for binding a seat belt.

[0002]

2. Description of the Related Art Some vehicle safety devices are provided with an airbag and a preloader, which is a device for binding a seat belt, and detect a collision state of a vehicle to control the operation of the airbag and the preloader. I have. JP-A-2-6395
The vehicle safety device disclosed in Japanese Patent Application Publication No. 4 (2004) activates a preloader when a small impact is detected on a vehicle, and activates an airbag and a preloader when a large impact is detected on a vehicle.

[0003] The technique disclosed in Japanese Patent Application Laid-Open No. 2-63954 will be described with reference to FIGS. As shown in FIG. 10, a circuit 100 of a conventional airbag system is configured by connecting a squib 110 to a power supply 120. The squib 110 is an ignition device in an inflator of an electric airbag system. The circuit 100 includes the first G
A sensor 130 and a second G sensor 140 are provided. The first G sensor 130 and the second G sensor 140 are provided with a first contact 130a and a second contact 140a, respectively. A resistor 170 having a large fail-safe resistance value at both ends of the first contact 130a, a second contact 140a
A resistor 180 having a large resistance value for fail-safe
Are connected respectively. Therefore, the second G sensor 14
Even in the case of a failure of 0, the squib 110 can be energized by detecting an impact by the first G sensor 130. First
The first contact 130a of the G sensor 130 is closed when a relatively small impact of about 5G is detected, and the second G sensor 1
The second contact 140a of 40 closes when a relatively large impact of about 30G is detected. The first G sensor 13
0 is provided on the indoor side of the engine room 160 of the vehicle 150 as shown in FIG.
Is provided between the engine room 160 of the vehicle 150 and the bumper at the front of the vehicle. As shown in FIG. 10, a circuit 190 of the seat belt tying device is branched and connected between the first contact point 130a and the squib 110. Between the first contact point 130a and the squib 110, a protective resistor 210 having a smaller resistance value than the squib 110 and the binding device 2
20 are connected in series. In addition, a ground resistance 200 having a larger resistance value than the squib 110 is connected in parallel to the squib 110 to prevent an overcurrent from flowing to the binding device 220. The seat belt 230 is tied up by the power supply from the power supply 120 to the tying device 220.

Next, the operation of the above-described vehicle safety device will be described. First, a case where a large impact is applied to the vehicle will be described. At this time, the second G sensor 140 provided in front of the engine room 160 of the vehicle 150 detects the impact, and the second contact 140a is closed by this detection. Next, the impact is transmitted to the rear part, and the first G sensor 130 detects the impact with a time lag, and the first contact 130a is also closed by this detection. From this, Squib 110
And the airbag is inflated by burning an inflator (not shown) in the airbag system. Is also energized further bondage device 220, bondage device 220 is operated, the seat belt 230 is tied. Next, a case where a small impact is applied to the vehicle will be described. At this time,
The first G sensor 130 detects an impact and detects a first contact 130a.
To close. As a result, power is supplied from the power source 120 to the binding device 220, and the binding device 220 is operated, and the seat belt 23 is
0 is tied up. When subsequently applied impact disappears vehicle 150, the first contact 130a is opened, bondage equipment 2
Is de-energized to 20, operation stops, loosen the bondage of the seat belt 230. In the case of a small impact, the second contact point 140a does not close, so that the squib 110 is not energized and the airbag does not operate.

[0005] In the vehicle safety device configured as described above, the second G sensor 140 is liable to break down.
The G sensor 130 also serves as a backup when the second G sensor 140 fails, but if a relatively small impact is applied to the vehicle, the first G sensor 13
0 detects an impact, the first contact 130a is closed, and the seat belt tightening device 220 is energized, and the seat belt 2
Since 30 is bound, the first G sensor 130 can be used effectively. And the safety can be further enhanced by the interlocking of the seat belt binding device and the airbag system.

[0006]

However, in a vehicle safety device for controlling the operation of a preloader and an airbag having a conventional structure, when a small impact is applied to a vehicle, only the preloader is activated and a large impact is applied to the vehicle. When it is applied, the control is to activate the preloader and the airbag, but only the impact applied to the vehicle is detected. Therefore, when the vehicle is subjected to a centrifugal force, such as a spin state in which the vehicle slides and turns in the lateral direction with respect to the traveling direction, or when the vehicle rolls around the longitudinal axis of the vehicle, such as in a rollover state in which the vehicle rolls over. In such a case, there is a problem that the preloader does not operate and the preloader is not efficiently used. The present invention has been made to solve the above-described problems, and an object to be solved by the present invention is to operate a preloader even when it is determined that the posture state of a vehicle is abnormal, and The purpose of the present invention is to improve the occupant protection performance by holding the vehicle with a seat belt.
Further object of the present invention, by adjusting the operating level of the airbag on the basis of the posture state of the vehicle is to improve further the passenger protection performance. Another object of the present invention is to prevent unnecessary operation of the airbag by returning the operation level to the original operation level when there is no operation for a predetermined time after adjusting the operation level.

[0007]

In order to solve the above-mentioned problems, the present invention comprises the following means. First, according to the first aspect of the present invention , a preloader and an air valve
Vehicle safety device that protects occupants by activating
A posture state detecting means for detecting a posture state of the vehicle;
Collision state detection means for detecting both collision states, and the posture
Posture state detection value detected by state detection means and setting figure
Posture state comparing means for comparing the force state value with the force state value;
Collision detection value detected by state detection means and set collision state
And a collision state comparing means for comparing the vehicle with the vehicle posture state.
In the case of an abnormality, the posture state signal is sent from the posture state comparing means.
No. or the collision state comparison when the vehicle is in a collision state
Receiving the collision state signal from the
Output preloader operation determining means and comparing the collision state
Actuates the airbag upon receiving the collision state signal from the vehicle
And an airbag operation determining means for outputting a signal . Next, the invention is claimed in claim according to claim 2
1. In the vehicle safety device according to 1, the posture state of the vehicle is different.
A posture state signal from the posture state comparing means
Received, the collision state signal outputs the set collision state value.
It is necessary to have a collision state value correction means for correcting
And features. Further, the invention according to claim 3 is
Item 3. The vehicle safety device according to item 2 , wherein the collision state value
Timer means for measuring an elapsed time after correction by the correction means,
The time is measured by the timer means, and after a predetermined time elapses, the setting is performed.
Has a cancellation means to return the constant collision state value to the normal value
It is characterized by the following.

[0008]

According to the first aspect of the present invention, the posture state detecting means detects the posture state of the vehicle, and the posture state comparing means compares the preset posture state value with the preset posture state value. The posture state detection value detected by the detection means is compared. When the posture state comparing means determines that the posture state of the vehicle is abnormal, such as a spin state or a rollover state, a posture state signal is sent to the preloader operation determining means. The preloader operation determination means which receives the posture state signal, and outputs an actuation signal to the preloading Da.
On the other hand, the collision state detection means detects the collision state of the vehicle
However, the collision state comparison means uses a predetermined setting collision.
Collision state value and collision state detected by collision state detection means
Compare with the detected value. Preloader not working, collision
Since the vehicle is in a collision state,
If it is determined that the operation of the loader is necessary,
A collision state signal is sent to the motion determining means. Collision state signal
The received preloader operation determination means operates the preloader.
Output a signal. Similarly, a collision is occurring and the airbag
If it is determined that activation is necessary, the airbag activation determination
A collision state signal is sent to the means. Received collision status signal
The airbag activation determining means sends an activation signal to the airbag.
Output. Therefore, even when the posture state is abnormal, such as when the vehicle is spinning or rolling over , the preloader can be used.
The occupant operates the preloader and the occupant
The occupant is further restrained by the
You can measure above.

[0009]

[0010] In the second aspect of the present invention, when the preloader is actuated when it is determined that the posture state is abnormal, the preset collision state value in the collision state comparison means set in advance is corrected by the collision state value correction. by means, than normal
Collision state signal is corrected to so that a easily output. Then, the collision state comparison means compares the detection value detected by the collision state detection means with the corrected set collision state value to determine whether the vehicle is in a collision state. When it is determined that the vehicle is in a collision state and the airbag operation determining means determines that the operation of the airbag is necessary, an operation signal is output to the airbag. Therefore, by detecting that the vehicle posture state such as the spin state and the rollover state is abnormal, the collision of the vehicle is predicted in advance, and the airbag is operated at a timing earlier than the normal operation of the airbag, and the occupant is activated. With an airbag for faster safety.

Furthermore, in the invention of claim 3, claim
The definitive collision state value correcting means 2, because setting the collision state value is than normally Tsu of easily outputting a collision state signal, when the elapse of a predetermined time is measured by the timer means, the canceling means, the collision Set the judgment value as usual. Therefore, even when detecting the spin state, etc., when there was nothing predetermined time, the setting collision state value of collision determination is the normal state, can prevent the work movement of the air bag is not necessary.
As a means for detecting the collision state of the vehicle, there is a means for measuring the deceleration of the vehicle using a G sensor or the like. In this case, when the detected deceleration becomes larger than the preset deceleration which is the set collision state value, the preloader or the airbag operates.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, 4, 5, 6, and 7. FIG. As shown in FIG. 2, the vehicle is provided with an airbag 1 and a preloader 2 which is a seat belt binding device as a vehicle safety device for improving the safety of the occupant. The airbag 1 includes a driver seat airbag 1a, a passenger seat airbag 1b, and occupant side airbags 1c and 1d (see FIG. 5). The driver's seat airbag 1a is disposed at the center of the steering wheel to restrain the driver in the event of a vehicle emergency. The passenger seat airbag 1b is disposed in the instrument panel to restrain an occupant on the passenger seat side.
As shown in FIG. 5, side airbags 1c and 1d are provided on the left and right inside the vehicle door, respectively. The preloader 2 is provided integrally with a retractor 27 of the seat belt device. A preloader 2a for a driver's seat, a preloader 2b for a passenger seat, and preloaders 2c and 2d for rear seats are provided on the left and right sides of a rear seat. I have.

FIG. 3 is a partial cross-sectional view of the seat belt device provided in the portion A shown in FIG. This seat belt device includes a preloader 2 and a retractor 27. The preloader 2 includes a driving device 28 including a cylinder 21, a piston 22, and a gas generator (not shown), a wire 23 having one end connected to the piston 22 of the driving device 28, and an intermediate portion of the wire 23 wound therearound. Roller 24 shown in FIG. The other end of the wire 23 is a free end. As shown in FIG. 3, the retractor 27 includes a webbing 26 and the preloader 2 on which the webbing 26 is wound.
And a housing member 25 that is not shown and rotates in conjunction with the roller 24.
FIG. 4 is a sectional view taken along the line XX of FIG. The operation of the preloader 2 will be described in detail with reference to FIG. FIG. 4A illustrates a state before the preloader 2 operates, and FIG. 4B illustrates a state after the preloader 2 operates.

When it is determined that the operation of the preloader 2 is necessary when the posture of the vehicle is abnormal or the vehicle is in a collision state, a gas generator (not shown) of the preloader 2 is activated, and Generates a large amount of gas. This gas is supplied to the piston 22 in the cylinder 21 shown in FIG.
Spouting downward, the piston 22 rapidly moves toward the cylinder tip 21a. Along with this movement of the piston 22, the wire 23 connected to the piston 22 is pulled upward, and as a result of the ejection of gas, the preloader 2
Is in the state shown in FIG. Thus, during the transition from the state of FIG. 4A to the state of FIG.
The wire 23 is strongly wound around the roller 24, and rotates in the Y direction as the roller 24 is pulled upward by the wire 23. At this time, a rotating drum (not shown) that rotates in conjunction with the rotation of the roller 24 also rotates in the Y direction. The webbing 26 shown in FIG. 3 is wound around the rotary drum, and the rotary drum Y shown in FIG.
Due to the rotation in the direction, the webbing 26 is rapidly wound on the rotating drum, and as a result, the seat belt restraining the occupant further tightens the occupant.

FIG. 5 shows a circuit configuration for operating the preloader 2 and the airbag 1, which will be described with reference to the block diagram of the vehicle safety device shown in FIG. 1 and 5 detects the posture state of the vehicle, and the collision state detection means 4 detects the vehicle deceleration. The posture state detecting means 3 includes, for example, yaw angular velocity detecting means, roll angular velocity detecting means, pitch angular velocity detecting means, and the like.
The yaw angular velocity detecting means may be a yaw angular velocity sensor, the roll angular velocity detecting means may be a roll angular velocity sensor, and the pitch angular velocity detecting means may be a pitch angular velocity sensor. The yaw angular velocity sensor detects a vehicle rotation speed around a vertical axis passing through the center of gravity of the vehicle. The roll angular velocity sensor detects the speed of the rotational movement of the vehicle about the longitudinal axis. The pitch angular velocity sensor detects the vibration of the vehicle about the left-right axis of the vehicle. Also,
The yaw angular velocity detecting means may calculate the yaw angular velocity based on the change amount of the steering wheel turning angle of the vehicle, or the pitch angular velocity detecting means may calculate the pitch angular velocity based on the moving change amount of the front and rear wheels of the vehicle, and the roll angular velocity detecting means. May calculate the roll angular velocity based on the change amount of the suspension left and right.

The collision state detecting means 4 detects the deceleration of the vehicle using, for example, a G sensor. This G sensor is
A front collision G sensor disposed on the front side member outside the vehicle and detecting deceleration in the vehicle front-rear direction, and a side collision G sensor disposed on the floor in the vehicle compartment and detecting deceleration in the vehicle left and right direction Consists of Based on the values detected by the front collision G sensor and the side collision G sensor, the collision state of the vehicle and the collision direction of the vehicle are calculated by a microcomputer 6 (to be referred to as a microcomputer hereinafter). In addition, G
The sensors are also provided in the vehicle interior. The front collision G sensor provided in the vehicle compartment detects a relatively small vehicle deceleration, while the G sensor provided outside the vehicle detects a relatively large vehicle deceleration.

The detected values from the posture state detecting means 3 and the collision state detecting means 4 are converted into A / D converters 5 shown in FIG.
Is input to the microcomputer 6 via the. The A / D converter 5 converts analog signals output from the posture state detecting means 3 and the collision state detecting means 4 into digital signals and inputs the digital signals to the microcomputer 6. In the microcomputer 6, based on the outputs from the posture state detecting means 3 and the collision state detecting means 4 converted into digital signals by the A / D converter 5, the posture state comparing means 14
And a predetermined operation is performed by the collision state comparing means 15;
Determine the current state of the vehicle. When the attitude state comparing means 14 in the microcomputer 6 shown in FIG. 1 determines that the attitude state of the vehicle is abnormal, such as a spin state or a rollover state, based on an output signal from the attitude state detection means 3 Then, a signal is output from the preloader operation determining means 16 in the microcomputer 6. As a result, as shown in FIG. 5, the switch 7 by the field effect transistor in the preloader driving circuit 40 is turned on, and the preloader 2 operates.

On the other hand, in the collision state comparison means 15 of the microcomputer 6 shown in FIG. 1, the output signal of the vehicle deceleration detected by the collision state detection means 4 and the relatively small collision of the vehicle are determined in advance. A comparison is made between the set vehicle deceleration and the first set collision state value to determine whether the vehicle is in a relatively small collision state. When it is determined that the vehicle is in a collision state and the preloader driving circuit 40 is not driven, a signal is output from the preloader operation determining means 16 in the microcomputer 6 and the switch 7 of the preloader driving circuit 40 is turned on, and the preloader driving circuit 40 is turned on. 2 operates.

The detected vehicle deceleration is compared with a second set collision state value higher than the first set collision state value by the collision state comparison means 15 in the microcomputer 6 shown in FIG. Then, when the operation of the airbag 1 is determined, that is, in the case of a relatively large collision, a signal is output from the airbag operation determining means 17 in the microcomputer 6. As a result, as shown in FIG.
Switches 8, 9, 10 using one field-effect transistor
Is turned on, the airbag squib is ignited, and the airbag 1 operates.

Note that, as shown in FIG.
In the operation circuit of the first embodiment, the airbag 1a for the driver's seat, the airbag 1b for the passenger's seat, and the airbags 1c and 1d for the side collision are provided with safing switches 11, 12, and 13, respectively. Prevent operation. Specifically, the safing switches 11, 12, and 13
It is normally OFF, but is configured to be mechanically closed and turned ON by G generated when the vehicle suddenly decelerates. When the deceleration is electrically detected by the collision state detecting means 4 and the microcomputer 6 determines that the airbag 1 is activated, a signal from the microcomputer 6 is transmitted to the switches 8, 9, and 10 which are field effect transistors. The switches 8, 9, and 10 are turned on. However, microcomputer 6
In some cases, the switches 8, 9, and 10 may be turned on due to electrical noise from the vehicle, even though the airbag 1 is not required. In such a case, the safing switch 1
Since G is not acting on 1, 12, and 13 and is in the OFF state, the airbag 1 does not operate. Therefore, by providing the safing switches 11, 12, and 13,
Malfunction of the airbag 1 can be prevented.

Next, control in the microcomputer 6 of the first embodiment will be described with reference to the flowcharts of FIGS. The main routine of the microcomputer shown in FIG. 6 starts from step 50, performs initialization in step 51, tests an initial failure of the system such as ROM and RAM inspection in step 52, and then executes an ignition system power supply line in step 53. Perform a failure test such as a short circuit. In step 54, the loop circulation interval is monitored for a fixed time. For example, 5m for a certain time
When set to s, it is determined whether 5 ms has elapsed,
When 5 ms has elapsed, the process proceeds to step 55, and when 5 ms has not elapsed, the process returns to step 54 again, and the same control is repeated. In step 55, whether or not there is any abnormality in this control is monitored based on whether or not a signal comes at the designated time. When a signal comes to step 55 at the designated time, the watchdog output boat is reversed. Therefore, every time the main routine makes one round, the watchdog output boat is inverted from 0 to 1 or from 1 to 0.

In parallel with the main routine shown in FIG. 6, interrupt control is performed at regular intervals, for example, 0.2 ms. In this interrupt control, for example, an interrupt may be performed at a point C shown in FIG.
This interrupt control will be described with reference to FIG.

As shown in FIG. 7, an interrupt is started in step 60, and in step 61, the yaw angular velocity, roll angular velocity, pitch angular velocity and the like measured by the posture state detecting means 3 shown in FIG. The digital signal is input to the microcomputer 6 via the D converter 5, and a predetermined calculation is performed in step 62 which is the posture state comparing means 14 shown in FIG. 1 to determine the posture state. In step 63,
If it is determined in step 62 that the posture state of the vehicle is an abnormal state such as a spin state or a rollover state, the process proceeds to step 64. In step 64, the preloader operation determining means 1 shown in FIG.
6, the preloader driving circuit 40 is driven to operate the preloader 2, and then the step 65 is performed.
Proceed to. If it is determined that the posture is not abnormal,
The process directly proceeds to step 65 without going through step 64.

[0024] At step 65 a collision state comparison unit 15 shown in FIG. 1, the vehicle deceleration is measured based on the output signal from the G sensor Ru collision state detecting means 4 der was detected in step 66 the vehicle The collision state is determined by comparing the deceleration with the first collision state value and the second collision state value of the vehicle deceleration that are set in advance. The second set collision state value is set higher than the first set collision state value. That is, the first set collision state value is set to detect a relatively small collision, and the second set collision state value is set to detect a relatively large collision.

Thereafter, the routine proceeds to step 67, where it is determined whether or not the preloader 2 has already been operated. If the preloader 2 has already been activated in step 64, step 7
The process proceeds to 0 to determine whether the operation of the airbag 1 is necessary. If the preloader 2 is not operating, step 68
Proceed to. In step 66, the first set collision state value is compared with the detected vehicle deceleration. As a result, if it is determined that the vehicle is in a collision state, the preloader operation determination means 16 shown in FIG. Then, it is determined that the operation of the preloader 2 is necessary, and a signal is output from the preloader operation determination means 16 to the preloader driving circuit 40. Then, in step 69, the preloader driving circuit 40 is driven, and the preloader 2 operates. If it is determined in step 68 that the operation of the preloader 2 is not necessary, step 7
Proceed to 2 to end the interrupt control.

Next, at step 70, which is the airbag operation determining means 17 shown in FIG. 1, the vehicle is decelerated by comparing the vehicle deceleration detected at step 66 with the second set collision state value. If it is determined that the operation of the bag 1 is necessary, the air bag driving circuit 41 is driven by the signal from the air bag operation determining means 17, and in step 71, the squib is ignited to activate the air bag 1, End the interrupt. If it is determined in step 70 that the operation of the airbag 1 is not necessary, the process proceeds to step 72, and the interrupt control ends. In such a control, even in the event of a vehicle emergency other than a collision, for example, when the vehicle posture is abnormal such as a spin state or a rollover state, the preloader 2 operates and the seat belt is tightened, so that the protection performance of the occupant is reduced. Further improvement can be achieved.

Next, the control of the second embodiment of the present invention will be described with reference to FIG. The main routine is the same as that of the first embodiment shown in FIG. In parallel with the main routine shown in FIG. 6, for example, 0.2 ms
The interrupt control is performed at regular intervals as shown in FIG.
In this interrupt control, for example, an interrupt is performed at a point C shown in FIG. This interrupt control will be described with reference to FIG.

As shown in FIG. 8, an interrupt is started in step 80, and in step 81, the yaw angular velocity, roll angular velocity, pitch angular velocity and the like measured by the posture state detecting means 3 shown in FIG. The digital signal is input to the microcomputer 6 via the D converter 5 and a predetermined calculation is performed in step 82 which is the posture state comparing means 14 shown in FIG. 1 to determine the posture state. In step 83,
When it is determined that the posture state of the vehicle is an abnormal state such as a spin state or a rollover state by the determination of the posture state in step 82, the process proceeds to step 84. In step 84, the preloader operation determining means 1 shown in FIG.
6, the preloader driving circuit 40 is driven to operate the preloader 2, and then the step 85
Proceed to. In step 85 which is the collision state value correcting means 19 shown in FIG.
The correction is made to be lower than the normal second set collision state value . That is, it is easy to output the collision state signal. After As a <br/>, the process proceeds to step 89. If it is determined in step 83 that the posture state is not abnormal, the routine proceeds to step 86, where the second set collision state value of the collision state determination for determining whether the operation of the airbag 1 is currently necessary is normal, or It is determined whether the corrected collision state value is equal to or less than the normal second set collision state value. If the second set collision state value has not been corrected, the process proceeds to step 89.

If it is determined in step 86 that the second collision judgment value is corrected and is equal to or smaller than the normal second collision judgment value, the process proceeds to step 87, and after the second collision judgment value is corrected, a predetermined time has elapsed. It is determined whether or not it has passed. This fixed time is measured by, for example, a timer 18. If the predetermined time has elapsed, the routine proceeds to step 88, where the second set collision state value is set to the normal second set collision state value, and the routine proceeds to step 89. The step of setting the corrected second set collision state value in the steps 86, 87, and 88 to the normal second set collision state value corresponds to the set collision state value canceling means 20 in FIG. . If the predetermined time has not elapsed in step 87, the process proceeds to step 89.

In step 89 which is the collision state comparing means 15 shown in FIG. 1, the vehicle deceleration which is an output signal from the G sensor which is the collision state detecting means 4 is measured. In step 90, the detected vehicle deceleration is measured. And a first set collision state value and a second set collision state value of the vehicle deceleration that are set in advance, respectively, to determine a collision state. The second set collision state value is set higher than the first set collision state value. That is, the first set collision state value is set to detect a relatively small collision, and the second set collision state value is set to detect a relatively large collision. Thereafter, the routine proceeds to step 91, where it is determined whether or not the preloader 2 has already been activated. Preloader 2 already has step 8
If the airbag 1 has been operated, the process proceeds to step 94, where it is determined whether the airbag 1 needs to be operated. If the preloader 2 has not been operated, the routine proceeds to step 92. In step 90, the first set collision state value is compared with the detected vehicle deceleration. As a result, if it is determined that the vehicle is in a collision state, the process proceeds to step 92 which is the preloader operation determination means 16 shown in FIG. If it is determined that the operation of the preloader 2 is necessary, a signal is output to the preloader driving circuit 40 based on a signal from the preloader operation determining means 16. Then, in step 93, the preloader 2 operates according to the output signal from the preloader driving circuit 40. If it is determined in step 92 that the operation of the preloader 2 is not necessary, the process proceeds to step 96, and the interrupt control ends.

Next, at step 94, which is the air bag operation determining means 17 shown in FIG. 1, the air deceleration is determined by comparing the vehicle deceleration detected at step 90 with the second set collision state value. If it is determined that the operation of the bag 1 is necessary, the circuit 41 for driving the air bag is driven by the signal from the air bag operation determining means 17, and in step 95, the squib is ignited to activate the air bag 1, End the interrupt. In step 94, the airbag 1
If it is determined that the operation is not necessary, the process proceeds to step 96, and the interrupt control is terminated. When the preloader 2 is operated by determining that the posture state of the vehicle is abnormal, a second value for comparing with the detection value of the collision state detection means 4 to determine whether or not the vehicle is in a collision state. Lower the set collision state value. As a result, the collision of the vehicle is predicted in advance based on the abnormality of the posture state, and the airbag 1 is activated even with the detection of a relatively small vehicle deceleration to quickly restrain the occupant. Further improvement can be achieved. After a certain period of time,
By returning the collision determination value to the normal second collision determination value, unnecessary operation of the airbag 1 can be prevented.

In the first and second embodiments, the interrupt control is performed at the point C of the main routine for convenience. However, the present invention is not limited to the point C, and a predetermined time such as 0.2 ms may be used. If possible, interrupt control is performed at any place in the main routine. In the first and second embodiments, when the preloader 2 operates, the driver's preloader 2a, the passenger's preloader 2b, and the rear seat preloaders 2c, 2d operate at the same time. May be determined, and only the preloader 2 at the seat where the occupant is located may be operated.

When the airbag 1 operates, the driver airbag 1a and the passenger airbag 1b operate simultaneously, but only the airbag 1 in the seat where the occupant is present is operated using a seating sensor. You may.

Further, in the present invention, the switches 7, 8, 9 and 10 in FIG. 5 use field-effect transistors having good responsiveness. However, the switches are not limited to the field-effect transistors, but may be bipolar transistors or the like.

Further, in this embodiment, the preloader 2
Although a type in which the rotating drum around which the webbing 26 is wound as shown in FIG. 9 is used, a type in which the inner buckle 30 is pulled in may be used as shown in FIG. The type in which the inner buckle 30 is retracted is provided in the portion B shown in FIG. 2, and the operation of the preloader will be described below. When an abnormality in the collision state or posture state of the vehicle is detected by a sensor (not shown) or the like, the solenoid 34 shown in FIG. 9 is driven, and the locking portion 31 is released. At this time, the spring 32 urged in the direction D shown in FIG. 9 moves in the direction E in FIG. 9, the wire 33 is pulled in the direction E, and the inner buckle 30 is pulled to move in the direction F. Thereby, the slack of the webbing can be absorbed. First of the present invention
In the second embodiment and the second embodiment, the microcomputer 6 includes a collision state comparison unit 15, an attitude state comparison unit 14, an airbag operation determination unit 17, and a preloader operation determination unit 16.
Having. In particular, in the second embodiment, the microcomputer 6 has a collision state value correcting means 19 and a canceling means 20.

[0036]

The vehicle safety device according to the present invention has a posture
The abnormal posture is judged by comparing the detected state value with the set posture state value.
The collision detection value is compared with the set collision state value to
Since the collision state is determined, set these values appropriately.
Or, abnormal by changing the set value according to the situation
The posture and the collision state can be accurately detected. Again
The airbag and preloader can be activated during a collision.
Can, rollover and the vehicles to roll in addition to this, such as a spin state side slip and the vehicle body is turning round the vehicle traveling direction, even when the vehicle posture state is abnormal,
As the preloader operates, the webbing tightens,
The occupant is fixed to the seat, and the occupant protection performance can be further enhanced. Further, posture state of the vehicle is determined to be abnormal when the preloader is activated, set collision state value in collision state comparing means is set in advance, the collision state value correcting means, the collision than normal state signal Is output
It is corrected to an easier so that. Therefore, by detecting that the posture of the vehicle is abnormal, the collision of the vehicle is predicted in advance, the airbag is activated at a timing earlier than the activation of the normal airbag, and the occupant is restrained more quickly by the airbag. And further improve safety. Moreover, setting the collision state value, it outputs a collision state signal from the normal
After Tsu a easy, to become a normal After a predetermined time has elapsed, be detected spin state, etc., when there was nothing predetermined time is set collision state value of collision determination is the normal state,
Unnecessary operation of the airbag can be prevented. As described above, the operation of the preloader is determined based on the posture state and the collision state, and when the preloader is operated due to an abnormality in the posture state, the airbag is operated by adjusting the operation level of the airbag based on the vehicle deceleration. It is possible to obtain a vehicle safety device that is more efficient and further improves the occupant protection performance.

[Brief description of the drawings]

FIG. 1 is a block diagram of a vehicle safety device according to the present invention.

FIG. 2 is a perspective view of a vehicle cabin in which an airbag as a vehicle safety device and a preloader are mounted.

FIG. 3 is a perspective view of the entire preloader.

FIG. 4 is a view of the preloader in FIG. 3 cut along XX.

FIG. 5 is a circuit configuration diagram of a vehicle safety device including an airbag and a preloader.

FIG. 6 is a flowchart illustrating a main routine of the microcomputer according to the first embodiment of the present invention;

FIG. 7 is a flowchart illustrating a subroutine of a microcomputer according to the first embodiment of the present invention;

FIG. 8 is a flowchart showing a subroutine of a microcomputer according to a second embodiment of the present invention;

FIG. 9 is a sectional view showing a preloader having another configuration.

FIG. 10 is a circuit configuration diagram of a vehicle safety device showing the prior art of the present invention.

FIG. 11 is a diagram showing a sensor mounting position of a vehicle safety device according to the prior art of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Airbag 2 ... Preloader 3 ... Attitude state detection means 4 ... Collision state detection means 14 ... Attitude state comparison means 15 ... Collision state comparison means 16 ... Preloader operation discrimination Means 17 ・ ・ ・ Airbag operation determination means 18 ・ ・ ・ Timer (timer means) 19 ・ ・ ・ Collision state value correction means 20 ・ ・ ・ Cancel means 40 ・ ・ ・ Preloader drive circuit 41 ・ ・ ・ Airbag drive circuit

Claims (3)

(57) [Claims] 1. A vehicle in which a preloader and an airbag are used in a vehicle emergency.
In a vehicle safety device that protects an occupant by operating the vehicle, a posture state detection unit that detects a posture state of the vehicle, a collision state detection unit that detects a collision state of the vehicle, and a posture state detected by the posture state detection unit Detection value
A posture state comparing unit that compares the collision state value with the set posture state value; and a collision detection value detected by the collision state detection unit.
A collision state comparing means for comparing the constant collision state value, the posture state comparator hand when posture state of the vehicle is abnormal
If the posture status signal from the step, or if the vehicle is in a collision state
Receiving a collision state signal from the collision state comparing means,
Receiving the collision state signal from the collision state comparing means,
Airbag activation discriminator that outputs an activation signal to the airbag
A safety device for a vehicle , comprising: a step ; 2. The method according to claim 1 , wherein the posture of the vehicle is abnormal.
Upon receiving the posture state signal from the posture state comparing means,
The collision state value is corrected to make it easier to output the collision state signal
Claims:
Car dual safety device according to claim 1. 3. After the correction by the collision state value correction means,
Timer means for measuring the elapsed time; and
Has a cancellation means to return the constant collision state value to the normal value
The vehicle safety device according to claim 2, wherein: