JP4591088B2 - Curtain airbag device for vehicle - Google Patents

Description

  The present invention relates to a vehicle curtain airbag device, and more particularly to a vehicle curtain airbag device that deploys and inflates an airbag body in a curtain shape on the vehicle interior side of a vehicle side window at least when the vehicle rolls over.

  Conventionally, in order to protect an occupant when the vehicle rolls over, the airbag body provided at the peripheral edge of the side window is deployed and inflated in the form of a curtain on the side of the passenger compartment when the vehicle rolls over, so that part of the occupant's body is There is known an airbag device for rollover that suppresses movement from the vehicle to the outside of the vehicle.

  For example, in Patent Document 1 below, when an airbag body in a housed state is installed on a pillar and a roof side rail, which are peripheral edges of a side window, when the vehicle rollover is detected, the airbag body is A curtain airbag device that protects an occupant by deploying and inflating in a curtain shape on the vehicle interior side of the wind is disclosed.

JP 2001-328503 A

  By the way, in the case of the curtain airbag device that supports rollover, the rollover state of the vehicle may continue for a long time. It is necessary to maintain and maintain the tension of the entire airbag body.

  As a method of maintaining the expanded and inflated state of the airbag main body for a long time, a method of applying a special paint to prevent outgassing on the surface of the airbag main body to reduce outgassing from the airbag main body, Like the above-mentioned Patent Document 1, a teaser (part sewn with a shearable thread) that breaks at a predetermined pressure is provided in the middle part of the airbag body to slow the deployment and inflation speed of the entire airbag body, resulting in deployment A method of extending the expanded state can be considered.

  However, the method for maintaining the expanded and expanded state by such a method has the following problems.

  First, in the method of applying a special paint to the airbag body, even if a special paint is applied, the gas escapes with the passage of time even though it is a small amount. There is a problem that the entire tension of the airbag body cannot be maintained for a long time.

  Also, with the method of providing a teaser in the middle of the airbag body, the deployment and inflation time can be slightly extended, but the gas supply from the inflator is only performed once, so there is a limit in time and it occurs for a long time. It is difficult to say that the expanded and inflated state can be sufficiently maintained with respect to the rollover of the running vehicle.

  Accordingly, the present invention is a curtain air bag device for a vehicle that deploys and inflates the air bag body in a curtain shape on the vehicle interior side of the side window of the vehicle, and can maintain the fully deployed and inflated state of the air bag body for a long time. Another object of the present invention is to provide a curtain airbag device for a vehicle that can maintain the overall tension of the airbag body.

The curtain airbag device for a vehicle according to the present invention is a curtain airbag device for a vehicle in which the airbag main body is deployed and inflated in a curtain shape on the side of the vehicle interior of the side window when the vehicle rolls over. A front end portion that is attached to the vehicle body side portion in front of the windshield and a rear end portion that is attached to the vehicle body side portion behind the side window, while maintaining a predetermined tension state between the front end portion and the rear end portion, It is configured to expand and inflate from above toward the lower end of the side window, and is provided with gas supply means for supplying inflator gas to the airbag body, and the gas supply means has a plurality of inflators. There, configured during rollover or rollover prediction of the vehicle, so that the gas is supplied from the first inflator, and then to supply the gas from the second inflator Te, wherein the first inflator is filled with a predetermined compressed gas, composed of an inflator for supplying the cold gas, wherein the second inflator is configured with an inflator for supplying a hot gas to ignite the gas generating agent, a single A low-temperature gas and a high-temperature gas are supplied from the first and second inflators to the inflating portion of one airbag body .

  According to the above configuration, the airbag body has a front end portion and a rear end portion that are attached to the vehicle body side portions at the front and rear sides of the side window, and is deployed and inflated from the upper side of the side window toward the lower end portion when deployed. Then, tension is generated in the vicinity of the lower end of the side window, that is, in the vicinity of the belt line. Further, the gas supply means for supplying the gas of the inflator to the airbag body divides the gas supply into a plurality of times, so that the complete deployment and inflation of the airbag body occurs a plurality of times when the vehicle rolls over. .

For this reason, the air bag body, it is possible to maintain the deployed and inflated state I cotton to a long period of time.

Moreover, the gas supply means has a plurality of inflators, during vehicle rollover, or during rollover prediction is configured so that the gas is supplied from the first inflator, and then to supply the gas from the second inflator The first inflator is configured by an inflator that encloses a predetermined compressed gas and supplies a low-temperature gas, and the second inflator is configured by an inflator that ignites a gas generating agent and supplies a high-temperature gas. Is.

Thus, the gas supply means has a plurality of inflators, during vehicle rollover, or roll-over prediction inflator (hereinafter, cold inflator) for supplying a cold gas during a first supplying gas to the air bag body is operated as an inflator, then, an inflator for supplying a hot gas (hereinafter, hot inflator) and will be operated as a second inflator for supplying gas to the airbag body.

  Here, the low-temperature inflator is an inflator that supplies a low-temperature gas (a gas having a temperature slightly higher than the atmospheric temperature) to the airbag body by enclosing a predetermined compressed gas and releasing the closing valve during operation.

  The high temperature inflator is an inflator that supplies a high temperature gas (a gas having a temperature close to the combustion temperature) to the airbag body by igniting a gas generating agent such as sodium azide during operation.

  For this reason, the airbag body is expanded and expanded by the low temperature gas supplied from the low temperature inflator at the initial stage of the vehicle rollover, and further expanded by the high temperature gas supplied from the high temperature inflator at the middle and late stages of the rollover of the vehicle. Will expand.

Thus, during the second inflator actuation, since the low-temperature gas filled in the air bag body is heated and expanded by the high temperature gas, more deployment and inflation of the airbag body is promoted, Tsu cotton deployment inflated state for a long time Can be maintained.

Thus, more reliably for a long time maintain the deployed and inflated state of the airbag body, Ru can be maintained for a long period of time the tension of the air bag body.

The above-mentioned side window includes all the windows provided on the side of the vehicle, such as the front side window of the front door, the rear side window provided on the rear door, and the quarter window provided on the quarter panel.

  Furthermore, the airbag main body may have any shape as long as the front end portion and the rear end portion are attached to the vehicle body side portion and tension is generated during deployment and inflation.

  In one embodiment of the present invention, there is provided an impact detection means for detecting an impact generated in the vehicle, and the second inflator detects when the impact value detected by the impact detection means is equal to or greater than a predetermined value. When it is predicted, the gas is supplied.

  According to the above configuration, the gas supply means has a plurality of inflators, and the first inflator supplies gas to the airbag body when the vehicle rolls over or predicts rollover, and the impact value generated in the vehicle thereafter is predetermined. The second inflator supplies gas to the airbag body when the value becomes equal to or greater than the value or when it is predicted that the value will be equal to or greater than the predetermined value.

  For this reason, when the vehicle rolls over or is predicted to roll over, the airbag body is in the first deployed and inflated state.After that, when an impact occurs on the vehicle or when the impact is predicted, the airbag body is in the second deployed and inflated state. Become.

  Therefore, the airbag main body can be maintained in the deployed and inflated state for a long time from the initial rollover of the vehicle to the secondary collision in the middle and late rollover. In addition, since the airbag body is in an expanded and inflated state at an appropriate timing when the impact of the secondary collision occurs in the vehicle, it is possible to reduce the impact on the occupant during the secondary collision and more appropriately protect the occupant. it can.

According to another embodiment of the present invention comprises a timer means to detect the elapsed time from the start of gas supply said first inflator, and a roll degree detecting means for detecting a rollover degree of vehicle, the second inflator ones, which detect the passage of a predetermined time from the gas supply start of the first inflator in the timer manually stage, upon detecting more than a predetermined rollover degree in lateral rolling degree detecting means, and configured to perform gas supply It is.

  According to the above configuration, the gas supply means has a plurality of inflators, and when the vehicle rolls over or predicts rollover, the first inflator supplies gas to the airbag body, and after a predetermined time has elapsed, The second inflator supplies gas to the airbag body when the degree of rollover is detected.

  For this reason, when the vehicle rolls over or is predicted to roll over, the airbag body is in the first deployed and inflated state, and then after a predetermined time has elapsed, the airbag body is in the second deployed and inflated state.

  As a result, the airbag main body is in the second deployed and inflated state after a predetermined time has elapsed in the first deployed and inflated state, and therefore, the airbag main body is not quickly contracted within a predetermined period, and maintains a long-term deployed and inflated state. be able to.

  In addition, since the airbag body is in a second deployed and inflated state when a predetermined degree of rollover is detected, the airbag body is properly deployed only when the vehicle rollover state continues for a long time. An inflated state can be achieved, and unnecessary inflator operation can be eliminated while enhancing occupant protection performance, and the inflator can be operated efficiently.

In one embodiment of the present invention, the first inflator that supplies the low-temperature gas is installed in the vehicle rear side pillar, and the second inflator that supplies the high-temperature gas is installed in the vicinity of the vehicle frontmost pillar. .

  According to the above configuration, a low-temperature inflator is installed in the vehicle rear side pillar with a relatively large space, and a high temperature inflator is installed in the vicinity of the front-most vehicle front pillar on the side of the front seat where the occupant (driver) is likely to be seated. Will do.

  For this reason, even if the low-temperature inflator is configured with a large size, the layout can be performed without affecting the design or the like on the vehicle body side. In addition, since the gas from the high-temperature inflator is supplied from the vicinity of the frontmost pillar at the time of the second expansion and expansion of the airbag body, the vicinity of the frontmost pillar is expanded and inflated at an early stage, and the passenger (driver) The protection performance can be increased more efficiently.

  Therefore, it is possible to increase the capacity of the low-temperature inflator and enable efficient operation of the high-temperature inflator.

According to the present invention, it is possible that the air bag body, will be repeatedly expanded and inflated multiple times during the rollover of the vehicle, to maintain the deployed and inflated state of the airbag body I cotton to a long period of time.

  Therefore, in the vehicle curtain airbag device in which the airbag body is deployed and inflated in a curtain shape on the vehicle interior side of the vehicle side window, the airbag body can be maintained in a fully deployed and inflated state for a long time. The overall tension can be maintained.

Embodiments of the present invention will be described in detail below with reference to the drawings.
FIG. 1 is an overall plan view of a vehicle adopting the curtain airbag device for a vehicle according to the first embodiment, FIG. 2 is an overall side view of a state in which the curtain airbag device is operated, and FIG. 3 is an overall plan view of the vehicle. It is.

  The vehicle V of this embodiment is a three-row seat wagon type vehicle in which a front seat 1, a first rear seat 2, and a second rear seat 3 are provided in the vehicle interior from the front side of the vehicle. The floor surface 4 in the passenger compartment is a flat surface extending substantially horizontally in the vehicle front-rear direction.

  In addition, the vehicle V is provided with a front door 5 and a rear door 6 on the side of the vehicle corresponding to the front seat 1 and the first rear seat 2, and a front side window 5 a and a rear door 6 are disposed above the front door 5. A rear side window 6a is provided at the upper part, and a quarter window 7 is provided at the upper part of the side part of the second rear seat 3.

  A line connecting the lower edges of the openings of the windows 5a, 6a, 7 on the side of the vehicle in the vehicle front-rear direction is referred to as a so-called belt line L. In the vehicle V of the present embodiment, the belt line L is inclined rearward so as to shift upward as it goes toward the vehicle rear side, thereby enhancing the merchantability in design.

  Further, pillars extending in the vehicle up-down direction are arranged between the front, rear and windows of the windows 5a, 6a, 7 on the side portions of the vehicles. Specifically, the A pillar 8 is in front of the front door 5, the B pillar 9 is between the front door 5 and the rear door 6, the C pillar 10 is between the rear door 6 and the quarter window 7, and the D pillar 11 is behind the quarter window 7. Is arranged.

  Of these pillars, the B-pillar 9, the C-pillar 10, and the D-pillar 11 are provided with seat belt devices 12 in order to restrain the occupants of each seat. These seat belt devices 12 are all three-point seat belt devices, and are provided with shoulder anchors 13 at the upper portions of the pillars 9, 10, 11, and retractor mechanisms 14 at the lower portions of the pillars 9, 10, 11. .

  A cloth airbag body 31 of the curtain airbag device is arranged in a folded storage state so as to surround the front side window 5a, the rear side window 6a, and the quarter window 7 at the side upper part in the vehicle interior. Specifically, the A pillar 8 is disposed so as to extend upward from the front end lower portion 8a, extend in the vehicle front-rear direction along the roof side rail 15, and further extend from the upper side of the D pillar 11 to the rear end lower portion 11a.

  By arranging the airbag main body 31 in this way, as shown in FIG. 2, when the airbag main body 31 is deployed and inflated in a curtain shape on the side of the vehicle interior when the vehicle rolls over, the vicinity of the belt line L Thus, a tension in the vehicle front-rear direction can be generated in the airbag main body 31. That is, by setting attachment points for attaching the front end portion 31a and the rear end portion 31b of the airbag main body 31 to the front end lower portion 8a of the A pillar 8 and the rear lower end portion 11a of the D pillar 11, the airbag main body can be expanded and inflated. A tension is generated at a position substantially coincident with the belt line L at the lower end 31c of the belt 31.

  That is, when the airbag body 31 is deployed and inflated, gas is supplied to the bag-like inflatable portions 33, so that the airbag body 31 is inflated in the vehicle width direction and the vehicle longitudinal direction length is shortened, thereby generating tension. To make it happen.

  The inflatable portions 33 are set substantially at the position of the occupant's head H, and are configured to reduce the impact on the occupant's head H during a rollover and a side collision.

  As described above, since the airbag body 31 is inflated and inflated, tension is generated in the airbag body 31, so that movement of the occupant from the windows 5 a, 6 a, and 7 toward the outside of the vehicle can be suppressed.

  Two inflators 40 and 50 for supplying gas to the airbag main body 31 are installed inside the D pillar 11 and the A pillar 8.

  The inflator 40 installed in the D pillar 11 is a first inflator 40 configured by a low temperature gas type inflator (hereinafter, low temperature inflator). The first inflator 40 is constituted by a long cylindrical container 40a in which a predetermined compressed gas is enclosed, and a closing valve (not shown) is released by a predetermined operation signal so that a low temperature gas is supplied to the airbag body 31. To supply.

  On the other hand, the inflator 50 installed in the A-pillar 8 is a second inflator 50 configured by a high-temperature gas type inflator (hereinafter, high-temperature inflator). The second inflator 50 is composed of a short cylindrical container 50a containing a gas generating agent (not shown) made of sodium azide inside, and igniting means (not shown) when receiving a predetermined operation signal. The gas generating agent is ignited and the high temperature gas is supplied to the airbag body 31.

  As described above, the first inflator 40 configured by the low temperature inflator is installed in the D pillar 11, and the second inflator 50 configured by the high temperature inflator is installed in the A pillar 8. The capacity of the low temperature gas can be increased.

  The low-temperature inflator encloses compressed gas inside, and therefore generally requires a large capacity. In particular, as in this vehicle, a wide range of windows 5a, 6a, and 7 on the side of the vehicle is used as one air. In the case of what is covered with the bag body 31, a large amount of gas is required to sufficiently expand and inflate the large airbag body 31.

  By installing the first inflator 40 in a pillar that is relatively wider than other pillars such as the D pillar 11, the capacity of the first inflator 40 can be increased without difficulty, and the capacity of gas can be increased. be able to.

  On the other hand, since the shoulder anchors 13 are installed on the B pillar 9 and the C pillar 10 on the vehicle body side, when the first inflator 40 is installed on the B pillar 9 and the C pillar 10, the B pillar is provided. 9, The C pillar 10 needs to be widened, and there is a concern that the design may be deteriorated. However, by installing the first inflator 40 in the D pillar 11, such a concern can be solved.

  Next, in the second inflator 50, occupant protection performance can be improved efficiently. Because the A pillar 8 is installed in the forefront of the vehicle and is located on the side of the front seat (driver's seat) 1 where the possibility of seating of the occupant is highest, the second inflator 50 is operated, When high-temperature gas is supplied to the airbag body 31, the gas is supplied from the position near the front seat 1 on the front side of the vehicle, and the airbag body 31 on the side portion of the front seat 1 is deployed and inflated at an early stage. Because you can.

  Therefore, by installing the second inflator 50 in the A pillar 8, the deployed and inflated state of the airbag main body 31 can function most efficiently for occupant protection.

  The operation timing of the first inflator 40 and the second inflator 50 will be described later.

  Further, between the first inflator 40 and the airbag main body 31, and between the second inflator 50 and the airbag main body 31, communication pipes 41 and 51 serving as gas supply passages are installed, respectively.

  A communication pipe 41 between the first inflator 40 and the airbag body 31 extends from the first inflator 40 to the front side of the vehicle, and communicates with the airbag body 31 at the center position of the airbag body 31 in the vehicle front-rear direction. . For this reason, the low-temperature gas supplied from the first inflator 40 is supplied from substantially the center of the airbag main body 31, and when the first inflator 40 is operated, the airbag main body 31 is entirely on the vehicle. It expands and expands evenly in the front-rear direction.

  A communication pipe 51 between the second inflator 50 and the airbag main body 31 extends from the second inflator 50 to the vehicle rear side and communicates with the airbag main body 31 at a position above the front seat. For this reason, the gas supplied from the second inflator 50 is supplied from the position of the front seat 1 and the occupant protection performance can be improved more efficiently.

  Various sensors are installed in each part of the vehicle V. A roll sensor 61 that detects the roll angle and roll angular velocity of the vehicle V is installed on the floor surface 4 behind the front seat 1. Further, a front collision sensor 62 that detects an impact from the front of the vehicle is provided in front of the front seat 1, and a rear collision sensor 63 that detects an impact from the rear of the vehicle is provided at the lower end of the B pillar 9. In the vicinity, side collision sensors 64 for detecting an impact from the side of the vehicle are installed.

  A system block of the curtain airbag device of this embodiment is shown in FIG. This system block includes a central processing unit (CPU) 60 that is a calculation means of the curtain airbag device. A vehicle speed sensor 65, a roll sensor 61, a side collision sensor 64, and a front collision are input to the central processing unit 60 as input means. The sensor 62 and the rear collision sensor 63 are connected, and the first inflator 40 and the second inflator 50 are connected as output means.

  This system block is controlled by the control flow shown in FIG.

  First, in S <b> 1, data obtained by each input unit is input to the central processing unit 60. For example, the vehicle speed, the roll angle θ, and the like are input to the central processing unit 60.

  Next, in S2, a rollover determination is performed. For example, when the vehicle speed is 100 km / h or more and the roll angle θ is 5 ° or more and the roll angular velocity Δθ is a predetermined value or more, it is determined that the rollover possibility is high. When the vehicle speed is 0 km / h, it may be determined that the roll angle θ is 45 ° or more and the rollover possibility is high.

  Then, in S3, it is determined whether the rollover possibility is determined to be high. If it is not determined that the rollover possibility is high (NO), the process proceeds to S1 again and the above-described control is repeated.

  On the other hand, if it is determined in S3 that the rollover possibility is high (YES), the process proceeds to S4 and the first inflator 40 is operated.

  As a result, a low-temperature gas is supplied to the airbag main body 31, and the airbag main body 31 is deployed and inflated on the vehicle interior side of the windows 5a, 6a, and 7 on the side of the vehicle. Suppress moving.

Then, the process proceeds to S5, to start the tie maca count. For example, to set the timer value in 4-6 seconds, to start the timer.

  Next, the process proceeds to S6, and the side collision determination value of the vehicle side collision is changed from the normal reference value. Specifically, the determination threshold value of the side collision sensor 64 is changed to be low. Thus, by changing the determination threshold value to be lower, the sensitivity to the impact can be increased than in a normal side collision, and the secondary impact determination (side collision determination) can be performed at an early stage.

  Furthermore, the airbag main body 31 is deployed and inflated even when the determination thresholds of the front collision sensor 62 and the rear collision sensor 63 are changed to be lower than the reference value and an impact is detected by these sensors 62 and 63. You may comprise.

  Next, the process proceeds to S7, where it is determined whether a side collision is detected (whether the side collision sensor has detected an impact). That is, after the rollover determination of the vehicle V, it is determined whether or not an impact is input to the side surface of the vehicle. This is a case where after the vehicle V rolls over, the rollover continues and a secondary collision occurs.

  When the side collision determination is made in S7 (YES), the process proceeds to S8 and the second inflator 50 is operated.

  As a result, the airbag main body 31 is again supplied with the high-temperature gas, and the airbag main body 31 is expanded and inflated again to suppress the movement of the occupant in the vehicle outward direction during the secondary collision and the secondary collision. Relieve shock at.

  Instead of the side collision determination in S7, the case before the secondary collision occurs, that is, the case where the vehicle V rolls over 180 ° or more may be determined from the roll angle θ and the roll angular velocity Δθ. In this case, when it is determined that the roll angle θ is equal to or greater than 100 ° and the roll angular velocity Δθ is equal to or greater than a predetermined value, the process may proceed to S8, or the roll angle θ is equal to or greater than 135 degrees. In some cases, the process may be shifted to S8.

  On the other hand, if the side collision determination is not made in S7 (NO), the process proceeds to S9 to determine whether a predetermined time has elapsed. This predetermined time is, for example, 4 to 6 seconds described above.

  Here, when it is not determined that the predetermined time has elapsed (NO), the process proceeds to S7 again and the above-described control is performed. When it is determined that the predetermined time has elapsed (YES), the process proceeds to S10, and at that time The roll angle θ and the roll angle Δθ at are input.

  As described above, the reason why the control is not shifted to the next control until the predetermined time elapses is that the operation of the second inflator 50 is delayed as much as possible to maintain the deployed and inflated state of the airbag body 31 for a longer time.

  After S10, the process proceeds to S11 to determine whether the roll angle θ is equal to or greater than a predetermined value or whether the roll angular velocity Δθ is equal to or greater than a predetermined value.

  If either is greater than or equal to a predetermined value (YES), the process proceeds to S8 and the second inflator 50 is operated. If none of them is equal to or greater than the predetermined value (NO), the process proceeds to the end and the control is terminated.

  As described above, when the roll angle is greater than or equal to the predetermined value or when the roll angular velocity is greater than or equal to the predetermined value, the second inflator 50 is operated to maintain or continue the rollover state of the vehicle V. Since the airbag main body 31 is again deployed and inflated in the (rotating) state, the tension of the airbag main body 31 is maintained, and the occupant is more reliably moved in the vehicle outward direction. Can be suppressed.

  That is, when it is necessary to suppress the movement of the occupant toward the outside of the vehicle for a longer period of time, the occupant protection is reliably achieved by appropriately inflating and inflating the airbag main body 31.

  Thus, according to this embodiment, when it is determined that the rollover possibility is high, the first inflator 40 is operated to deploy and inflate the airbag main body 31, and then a secondary collision occurs until a predetermined time elapses. The second inflator 50 is actuated when detected or predicted, and after a predetermined time has elapsed, the second inflator 50 is actuated according to the rollover state of the vehicle V, and the airbag body 31 is deployed and inflated again. become.

  Therefore, the movement of the occupant toward the outside of the vehicle when the vehicle rolls over can be suppressed by the first operation of the first inflator 40, and then the airbag body is operated for a long time by the second operation of the second inflator 50. The developed and expanded state of 31 can be maintained.

  In particular, the operation of the second inflator 50 is performed by detecting or predicting the impact, whereby the impact on the occupant during the secondary collision can be reduced. In addition, by operating the second inflator 50 according to the rollover state of the vehicle after a predetermined time has elapsed, the tension of the airbag body 31 can be more efficiently maintained for a long time.

  An example of the relationship between the behavior when the vehicle V rolls over and the deployed and inflated state of the airbag body 31 will be described with reference to the schematic diagram of FIG. (A) is the state of the vehicle V before rollover, (b) is the behavior of the vehicle V at the start of rollover, and (c) to (e) are schematic diagrams showing the behavior of the vehicle V during rollover.

  When the roll angle θ of the vehicle V is between 5 ° and 85 ° (b) to (c), preferably between 5 ° and 45 °, the first inflator 40 is activated when it is determined that the rollover possibility of the vehicle V is high. Then, the airbag body 31 in the stored state is brought into a deployed and inflated state. Thereby, the passenger | crew protection at the initial stage of rollover can be aimed at.

  Thereafter, when the rollover state of the vehicle V continues and the roll angle θ is about 270 °, that is, when the opposite side surface of the vehicle rolls over and contacts the road surface or the like (e), the second is detected by detecting the impact. The inflator 50 is operated, and the airbag main body 31 is again brought into a deployed and inflated state close to the maximum. Accordingly, it is possible to reliably prevent the occupant from moving outward from the middle of the rollover and also to reduce the impact on the occupant due to the secondary collision.

  However, even if no impact is detected when the vehicle V falls down, the second inflator 50 is operated after a predetermined time has elapsed. As a result, the airbag body 31 can be placed in an expanded and inflated state for a longer period of time, thereby protecting the occupant in the later stage of rollover.

  FIG. 7 is a graph showing changes in the internal pressure of the airbag body 31 when the airbag body 31 is deployed and inflated twice.

  As shown in this graph, when the first inflator 40 is actuated, the internal pressure of the airbag body 31 rises from the housed state to the deployed and inflated state. At this time, since the first inflator 40 is composed of a low-temperature inflator, the internal pressure gradually increases with time and rises to the fully expanded expansion value. After that, the internal pressure decreases with time. This is because slight outgassing occurs from the airbag body 31.

  However, since the airbag body 31 is expanded and inflated with low-temperature gas, the gas in the airbag body 31 is not rapidly cooled by the vehicle compartment temperature, and the internal pressure of the airbag body 31 gradually decreases. .

  Thereafter, when the second inflator 50 is actuated, the internal pressure of the airbag body 31 is increased again, and the fully inflated value is obtained.

  In particular, since the second inflator 50 is composed of a high-temperature inflator, the low-temperature gas already filled in the airbag body 31 is heated and expanded with the high-temperature gas, and the internal pressure of the airbag body 31 increases.

  For this reason, the internal pressure of the airbag main body 31 shifts for a long time in a state in which the allowable lower limit value necessary for securing a desired tension is maintained.

  The graph shown in FIG. 8 is a graph showing a change in the internal pressure of the airbag main body when the airbag main body is deployed and inflated twice as in FIG. 7, but unlike the present embodiment, the upper graph shows the first inflator. A graph showing a high-temperature inflator and a second inflator made up of a low-temperature inflator, and a lower graph showing a first inflator made up of a high-temperature inflator and a second inflator made up of a high-temperature inflator.

  First, in the upper graph, since the first inflator is a high-temperature inflator, the internal pressure of the airbag body suddenly rises and instantaneously becomes a fully deployed inflation value. However, since the gas is hot, it is rapidly cooled at the vehicle interior temperature, and the internal pressure of the airbag body is reduced.

  After that, even if the second inflator is activated, the low temperature gas is supplied, so the high temperature gas filled in the airbag body is further cooled and contracted, and the internal pressure of the airbag is maintained at a high level for a long time. Can not. Thereafter, the internal pressure starts to increase, but the allowable lower limit cannot be maintained as in the present embodiment.

  On the other hand, also in the lower graph, since the first inflator is a high-temperature inflator, the internal pressure of the airbag main body rises abruptly as in the upper graph, and instantaneously becomes a fully deployed expansion value. However, in this case as well, it is rapidly cooled by the vehicle interior temperature, and the internal pressure of the airbag body decreases.

  After that, by operating the second inflator, the high pressure gas is supplied to increase the internal pressure and become the fully expanded expansion value. However, the allowable lower limit value cannot be maintained for a long time as in this embodiment. .

  Thus, from the graphs of FIGS. 7 and 8, it is most preferable to maintain the first inflator 40 as in the present embodiment in order to maintain the airbag body 31 in the expanded and inflated state for a long time. It can be seen that the low-temperature inflator and the second inflator 50 are a high-temperature inflator.

  Therefore, when the inflator is activated a plurality of times as in the present embodiment, and the low temperature inflator is activated first and then the high temperature inflator is activated later, the air bag is turned over for a long time when the vehicle V rolls over. The deployed state of the main body 31 with a high tension can be maintained, and the tension of the airbag main body 31 can be maintained for a long time to suppress the movement of the occupant in the vehicle outward direction.

  In the present embodiment, the inflator is composed of the first inflator 40 and the second inflator 50. However, the number of third, fourth,... The airbag body 31 may be configured to maintain the deployed and inflated state.

Next, a second embodiment (example disclosure structure) will be described with reference to FIGS.
FIG. 9 is an overall plan view of a vehicle V ′ adopting the vehicle curtain airbag device of the second embodiment, FIG. 10 is a detailed structural diagram of the inflator 140 of this embodiment, and FIG. 11 is a system block diagram of the embodiment. is there.

  Similarly to the first embodiment, in this embodiment, when the vehicle V 'rolls over, the airbag body 31 is deployed and inflated in a curtain shape on the vehicle interior side of the windows 5a, 6a, 7 on the vehicle side, thereby This suppresses the movement of the vehicle outward.

  However, in this embodiment, unlike the first embodiment, a single inflator 140 that supplies gas to the airbag body 31 is configured. For this reason, in this embodiment, the supply valve 141 which supplies gas separately is provided in the gas outlet 140b of the inflator 140 so that the gas supply timing of one inflator 140 may be divided into a plurality of times. In addition, about the component similar to 1st embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The inflator 140 according to this embodiment is a low-temperature inflator and is installed inside the D pillar 11.

  The reason why the inflator 140 is composed of a low-temperature inflator is that it is easy to divide and supply gas.

  In addition, by installing the inflator 140 inside the D pillar 11, the inflator 140 can have a large capacity as in the first embodiment.

  The inflator 140 includes a long cylindrical container 140a filled with compressed gas and a gas jet port 140b, and an electromagnetic solenoid type supply valve 141 that opens and closes the gas jet port 140b by a predetermined open / close signal (operation signal). Provided.

  The supply valve 141 is controlled as will be described later, and supplies the low-temperature gas from the inflator 140 to the airbag body 31 in a divided manner.

  The system block of the curtain airbag device of this embodiment also includes a central processing unit (CPU) 160 as a calculation means. A vehicle speed sensor 165, a roll sensor 161, and a side collision sensor are input to the central processing unit 160 as input means. 164, the front collision sensor 162, and the rear collision sensor 163 are connected, and the supply valve 141 of the inflator 140 is connected as output means.

This system block is controlled by the control flow shown in FIG.
This control flow is also substantially the same as the control flow of the first embodiment (see FIG. 5). S31 to S33 are S1 to S3, S35 to S37 are S5 to S7, and S39 to S41 are the same as S9 to S11. These steps are not described here.

  In the present embodiment, the supply valve 141 of the inflator 140 is first actuated in S34. That is, when it is determined that the vehicle V 'is likely to roll over, the first gas supply is performed.

  In S38, the supply valve 141 of the inflator 140 is actuated second. In this case as well, the second gas supply is performed when a predetermined impact is detected, or when the vehicle V continues to roll over after a predetermined time has elapsed since the first gas supply.

  About this operation timing, it is the same as that of 1st embodiment, and an effect is also the same.

  In the present embodiment, the opening / closing control of the supply valve 141 is different between the first operation and the second operation. That is, the supply valve is controlled by the duty control map shown in FIG.

  In the first operation, the opening ratio of the supply valve 141 is fully opened to increase the duty ratio. This is because the first operation is the first gas supply to the airbag body 31, and it is necessary to supply a large amount of gas at an early stage in order to change the airbag body 31 from the stored state to the expanded state. It is. However, the internal pressure does not rise excessively by shortening the opening period.

  In the second operation, the opening ratio of the supply valve 141 is reduced to reduce the duty ratio. This is because the second operation is the second gas supply to the airbag main body 31, and the supply of gas is continued for as long as possible only by replenishing the amount of gas loss, and the expanded state is maintained as long as possible. is there. Therefore, this open period is also set longer than in the first operation.

  In the present embodiment, the second operation of the inflator 140 is performed when an impact is generated on the vehicle V or when the rollover continues or is maintained, so that the inflator 140 can cope with various rollover forms of the vehicle. Thus, the airbag body can be deployed and inflated.

  Further, by changing the duty ratio of the second operation, it is also possible to obtain the expanded and inflated state of the airbag body 31 corresponding to the rollover configuration.

  Thus, in this second embodiment, the gas supply of one inflator 140 is divided into a plurality of times, so that the supply timing to the airbag body 31 is shifted and the deployed and inflated state of the airbag body 31 is kept for a long time. It is configured to maintain.

  For this reason, unlike the first embodiment, it is not necessary to provide a plurality of inflators 140, and the layout of the curtain airbag device can be improved. Moreover, more appropriate gas supply can be performed by changing the opening / closing control method of the supply valve 141.

  Other operational effects are the same as those in the first embodiment.

  In this embodiment, the inflator 140 is operated at two operation timings. However, this operation timing is not limited to two times, and is operated three times, four times, and a plurality of times. You may comprise as follows.

  Further, if it is possible in terms of the structure of the inflator, it may be configured by a high temperature inflator so that the high temperature gas is supplied a plurality of times.

  Furthermore, the installation position of the inflator is not limited only to the D pillar, and may be installed in other vehicle body side parts.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The side window of the present invention corresponds to the front side window 5a, rear side window 6a, quarter window 7 of the embodiment,
Similarly,
The vehicle body side part in front of the side window corresponds to the A pillar 8,
The vehicle body side part behind the side window corresponds to the D pillar 11,
The gas supply means corresponds to the first inflator 40, the second inflator 50, the central processing unit 60,
The impact detection means corresponds to the side collision sensor 62, the front collision sensor 62, and the rear collision sensor 63,
Timer hand stage, corresponds to the central processing unit 60,
The rollover degree detection means corresponds to the roll sensor 61,
The rollover form detecting means corresponds to the roll sensor 61,
The present invention is not limited to the above-described embodiment, but includes an embodiment applied to any vehicle curtain airbag device.

  In the above-described embodiment, a three-row seat wagon type vehicle has been described, but it may be implemented by a two-row seat sedan type vehicle or a sports car type vehicle.

1 is an overall side view of a vehicle according to a first embodiment. The whole side view of the state which act | operated the curtain airbag apparatus. FIG. The system block diagram of 1st embodiment. The control flowchart of 1st embodiment. The schematic diagram which showed the behavior at the time of rolling over of a vehicle. The graph which showed the internal pressure change of the air bag body. The graph which showed the internal pressure change of the other airbag main part. The whole vehicle side view of 2nd embodiment (Example disclosure structure). Detailed view of the inflator. The system block diagram of 2nd embodiment. The control flowchart of 2nd embodiment. Control map of supply valve duty control.

V ... Vehicle 5a ... Front side window (side window)
6a ... Rear side window (side window)
7. Quarter window (side window)
31 ... Airbag body 31a ... Front end 31b ... Rear end
33 ... Expansion part 40 ... 1st inflator (gas supply means)
50. Second inflator (gas supply means)

Claims (4)

A curtain airbag device for a vehicle in which an airbag body is deployed and inflated in a curtain shape on the vehicle interior side of the side window when the vehicle rolls over,
The airbag main body has a front end portion attached to a vehicle body side portion in front of the side window and a rear end portion attached to the vehicle body side portion in the rear of the side window, and a predetermined tension state between the front end portion and the rear end portion. It is configured to expand and expand from the upper side of the side window toward the lower end of the side window,
A gas supply means for supplying inflator gas to the airbag body is provided,
The gas supply means has a plurality of inflators, and is configured to supply gas from the first inflator at the time of vehicle rollover or rollover prediction, and then supply gas from the second inflator,
The first inflator is composed of an inflator that encloses a predetermined compressed gas and supplies a low temperature gas ,
The second inflator is composed of an inflator that ignites a gas generating agent and supplies a high-temperature gas,
A curtain airbag device for a vehicle , characterized in that low temperature gas and high temperature gas are supplied from the first and second inflators to an inflated portion of a single airbag body . An impact detection means for detecting an impact generated in the vehicle is provided,
The second inflator when the impact value to be detected by the impact detecting means exceeds a predetermined value, or when is foreseen to be the predetermined value or more, for a vehicle of claim 1, wherein configured to perform gas supply Curtain airbag device. A timer means to detect the elapsed time from the start of gas supply said first inflator,
A rollover degree detecting means for detecting the rollover degree of the vehicle,
The second inflator detects a lapse of a predetermined time from the gas supply start of the first inflator in the timer manually stage, upon detecting more than a predetermined rollover degree in lateral rolling degree detecting means, to perform the gas supply The curtain airbag device for a vehicle according to claim 1 configured as described above. The first inflator for supplying the low-temperature gas is installed on the vehicle rear side pillar,
The curtain airbag device for a vehicle according to claim 1, wherein the second inflator for supplying the high-temperature gas is installed in the vicinity of a vehicle frontmost pillar.

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