JP5204014B2 - Crew protection device - Google Patents

Description

  The present invention relates to an occupant protection device, and more particularly to an occupant protection device that appropriately protects an occupant from an impact generated in a vehicle.

  In order to protect an occupant from an impact applied to the vehicle, an occupant protection device that detects a side collision based on the magnitude of the impact (hereinafter referred to as acceleration) and deploys an airbag may be mounted on the vehicle. Such a vehicle is equipped with a side airbag (hereinafter referred to as SAB) and a curtain shield airbag (hereinafter referred to as CSA) in order to cope with a side collision. By the way, especially the door part of a vehicle is exposed to the vibration (henceforth a door part vibration) by the opening / closing of a door, opening / closing of a window, a passenger | crew's contact (hitting with a hand, etc.), and driving on a bad road. In order to prevent the SAB or CSA from being erroneously deployed due to this door vibration, a non-operation requirement for determining whether or not an acceleration greater than the door vibration is detected is defined.

  Therefore, such an occupant protection device is required to appropriately set a deployment requirement for deploying SAB or CSA and a non-operation requirement when actually colliding with an obstacle. With respect to this point, a technique for determining a deployment requirement with a plurality of signals has been proposed (for example, see Patent Document 1).

  Japanese Patent Application Laid-Open No. H10-228867 makes it a deployment requirement that a side collision sensor (hereinafter referred to as a G sensor) detects a side collision and a radar that detects a side obstacle predicts a side collision of the obstacle. Therefore, it is intended to suppress erroneous development and to ensure that SAB or CSA is deployed.

Japanese Patent Laid-Open No. 2005-126006

  However, the occupant protection device described in Patent Document 1 is prone to misdeployment due to door vibration if the deployment requirement threshold value is set so as to eliminate the SAB or CSA deployment delay when an impact is detected. Increasing the threshold value for determining the non-operation requirement to suppress the expansion includes the contradictory problem of causing the SAB expansion delay or non-expansion at the time of a side collision.

  In response to such a problem, it is conceivable to invalidate or make the non-operational requirement insensitive if an impact that is enough to deploy the airbag is detected. By doing so, the behavior of the side impacted vehicle becomes unstable, and passenger protection is facilitated when there is a secondary collision with another vehicle or a feature. However, since a variety of collision modes can occur in a running vehicle, even if an impact that causes the airbag to be deployed is not detected, the behavior of the host vehicle becomes unstable, and other vehicles and features There is a problem that there is a risk of a secondary collision.

  In view of the above-described problems, the present invention provides an occupant protection device that suppresses erroneous deployment without causing delay or non-deployment of an airbag and protects the occupant from secondary collisions without requiring deployment of the airbag. The purpose is to provide.

  In view of the above problems, the present invention includes a plurality of impact sensors, and when any of the impact sensors detects a signal value equal to or greater than a first threshold and the non-operation requirement is not satisfied, the threshold is equal to or greater than the first threshold. In the occupant protection device that deploys the airbag corresponding to the shock sensor that has detected the signal value of any of the above, if any of the plurality of shock sensors detects a signal value equal to or greater than the second threshold value that is less than the first threshold value, Disabling or sensitizing the determination of deployment requirements.

  It is possible to provide an occupant protection device that suppresses erroneous deployment without causing a deployment delay or non-deployment of an airbag and protects the occupant from a secondary collision without requiring deployment of the airbag.

It is a figure for demonstrating the outline of a passenger protection device. It is a figure for demonstrating the expansion | deployment requirement of an airbag (Example 1). (Example 2) for demonstrating the expansion | deployment requirement of an airbag. (Example 3) for demonstrating the expansion | deployment requirement of an airbag.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1A is a diagram for explaining an outline of the occupant protection device 100 of the present embodiment. An occupant protection device 100 is mounted on the vehicle A, and front G sensors 11 and 12 that detect acceleration due to a side collision are mounted on the vehicle A. The front G sensors 11 and 12 are provided in a portion (for example, a center (B) pillar) where a large acceleration occurs when a side collision occurs on the front seat side. In addition, a rear G sensor may be provided in a portion (for example, the rear (C) pillar) that generates a large acceleration when a rear seat side collision occurs, or a G sensor is disposed in the front bumper for front collision detection. A G sensor may be disposed on the rear bumper for rear collision detection. The side collision may be detected not only by acceleration but also by load (pressure) or from both acceleration and weight.

  The acceleration detected by the front G sensors 11 and 12 is output to an airbag control unit that controls the deployment of a side airbag (hereinafter referred to as SAB) or a curtain shield airbag (hereinafter referred to as CSA). One of the deployment requirements for SAB or CSA is that the acceleration detected by the front G sensors 11 and 12 is equal to or greater than the threshold value I.

  However, as shown in the figure, when the vehicle B collides with the vehicle A, a collision mode in which the acceleration detected by the front G sensor 11 does not exceed the threshold value I may occur. FIG. 1B is a diagram illustrating an example of acceleration detected by the front G sensor 11. As shown in the figure, the acceleration does not exceed the threshold value I.

  In addition, the occupant protection device 100 of the vehicle A prevents the SAB or CSA from being erroneously deployed due to vibration caused by opening / closing of a door, opening / closing of a window, contact of an occupant, and traveling on a rough road (hereinafter referred to as door vibration). In order to do so, non-operational requirements are established. Since the non-operation requirement corresponds to a large door portion vibration, a value that is approximately the same as the threshold value I or larger than the threshold value I is set. Therefore, in the collision mode where the acceleration is not equal to or greater than the threshold value I, the non-operation requirement may suppress the development of SAB or CSA (the non-operation requirement is different from the calculation method for detecting the collision because the calculation method of acceleration is different, SAB or CSA may be deployed without non-operational requirements).

  However, even in such a minor collision, the behavior of the vehicle A may become unstable because the driver of the vehicle A erroneously operates the steering wheel or gets on the curb. The vehicle A whose behavior becomes unstable may collide with a power pole or the like in the traveling direction, or may have a secondary collision with a vehicle coming from the traveling direction.

  Therefore, when the occupant protection device 100 of the present embodiment detects that the behavior of the vehicle A becomes unstable (hereinafter referred to as “collision determination is satisfied”), it invalidates or is sensitive to the determination based on the non-operation requirement. Turn into. By doing so, the airbag control unit can easily deploy the SAB or CSA against the secondary collision, and can appropriately protect the occupant from the secondary collision.

  FIG. 2 is a diagram for explaining air bag deployment requirements in the occupant protection device 100 of the present embodiment. Since this airbag is intended to protect the occupant from secondary collisions, it includes not only SAB or CSA but also airbags in the driver's seat or the passenger seat.

  As shown in the drawing, the output of “passenger protection device non-operation requirement OFF determination” and the output of “collision determination” are OR circuit 21, and the output of OR circuit 21 and the output of “passenger protection device operation requirement ON determination” are The AND circuits 22 are connected to each other. This determination is made by the CPU that executes the program stored in the EEPROM or the like by the airbag control unit.

  “Collision determination” means that, for example, even when the vehicle B collides with the vehicle A, a collision mode in which the acceleration detected by the front G sensor 11 is not equal to or greater than the threshold value I is detected. This collision mode includes not only a side collision but also a front collision and a rear collision. Moreover, the case where the vehicle A rolls over (rolls over) is also included. The case of slipping, spinning, or detecting understeer or oversteer exceeding a predetermined value may be included in the establishment of the “collision determination”.

  If the acceleration detected by the front G sensors 11 and 12 by the front G sensors 11 and 12 and the G sensor (not shown) by the G sensor (not shown) is greater than or equal to the threshold II, the airbag control unit determines that the “collision determination” has been established. judge. Since the threshold value II is smaller than the threshold value I, the occupant protection device 100 can detect a slight collision. Since “1” is input to the OR circuit 21 when the collision determination is established, “1” is input to the AND circuit 22 regardless of whether the “occupant protection device non-operation requirement OFF determination” is established.

  “Occupant protection device non-operation requirement OFF determination” is satisfied when the non-operation requirement of the occupant protection device 100 is not satisfied, that is, when an acceleration that does not satisfy the non-operation requirement is detected. For example, when the door vibration more than expected due to the opening and closing of the door is detected, the “occupant protection device non-operation requirement OFF determination” is established. As described above, in order to prevent the SAB or CSA from being erroneously deployed due to relatively large door vibration, the non-operation requirement is set to a value approximately equal to or greater than the threshold value I. When “passer protection device non-operation requirement OFF determination” is established, “1” is input to the OR circuit 21.

  “Occupant protection device operation requirement ON determination” is established when the acceleration detected by the front G sensor 12 is equal to or greater than a threshold value I. When the “passenger protection device operation requirement ON determination” is established, “1” is input to the AND circuit 22.

  According to the deployment requirements of FIG. 2, if “collision determination” is satisfied, “occupant protection device non-operation requirement OFF determination” is not satisfied, but “occupant protection device operation requirement ON determination” is satisfied, It is possible to deploy the airbag corresponding to the front G sensors 11 and 12 or the front and rear collision G sensors that have established the “protection device operation requirement ON determination”. For example, when the “collision determination” is established by the acceleration detected by the left front G sensor 11, the occupant protection device 100 simply determines that the acceleration detected by the right front G sensor 12 is equal to or greater than the threshold value I, and the right SAB or CSA can be deployed.

  When the “collision determination” is established by the acceleration detected by the left front G sensor 11, the occupant protection device 100 determines whether the left SAB or the left SAB or the acceleration detected by the left front G sensor 11 is equal to or greater than the threshold I. Deploy CSA. When the “collision determination” is established, the occupant protection device 100 deploys the front collision airbag when the acceleration detected by the front collision detection G sensor is equal to or greater than the threshold value I. That is, the G sensor that performs “collision determination” and the G sensor that “determines occupant protection device operation requirement ON determination” may be the same, and the secondary collision is not limited to a side collision.

  Therefore, the occupant protection device 100 can protect the occupant of the vehicle A whose behavior has become unstable due to a slight collision without delay. That is, even if the “occupant protection device non-operation requirement OFF determination” is difficult to be established to prevent erroneous deployment due to door vibration, the “occupant protection device non-operation requirement OFF determination” can be invalidated by the OR circuit 21. The right side SAB or CSA can be developed only by the right front G sensor 12 detecting an acceleration equal to or greater than the threshold value I.

  Further, FIG. 2 shows a case where the “occupant protection device non-operation requirement OFF determination” is invalidated, but when the OR circuit 21 is replaced with an AND circuit and the “collision determination” is established, the “occupant protection device non-operation requirement OFF” If the requirement for “determination” is relaxed, “passage protection device non-operation requirement OFF determination” can be made more sensitive.

  According to the occupant protection device 100 of the present embodiment, when the “collision determination” is established while reliably preventing erroneous deployment due to door vibration by the “occupant protection device non-operation requirement OFF determination”, By invalidating or sensitizing the “device non-operation requirement OFF determination”, the passenger of the vehicle A whose behavior becomes unstable can be protected from the secondary collision without delay.

  In the present embodiment, an occupant protection device 100 that makes the “occupant protection device operation requirement ON determination” more sensitive will be described.

  FIG. 3 is a diagram for explaining the deployment requirements of the airbag in the occupant protection device 100 of the present embodiment. 3, the same parts as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 3, the “occupant protection device operation requirement ON determination 2” is newly provided, and the output of the “occupant protection device operation requirement ON determination 2” and the output of “collision determination” are connected to the AND circuit 23. The output of the AND circuit 23 is connected to the OR circuit 24. The output of “Occupant protection device operation requirement ON determination 1” is connected to the OR circuit 24, and the output of the OR circuit 24 is connected to the AND circuit 25. The output of “Occupant protection device non-operation requirement OFF determination” is connected to the AND circuit 25.

  “Occupant protection device operation requirement ON determination 2” is established when the acceleration detected by the front G sensors 11 and 12 is equal to or greater than the threshold value III. When the “occupant protection device operation requirement ON determination 2” is established, “1” is input to the AND circuit 23. The threshold value III is smaller than the threshold value I. That is, the “occupant protection device operation requirement ON determination 2” may be satisfied even if the “occupant protection device operation requirement ON determination 1” is not satisfied. Note that thresholds III and II are both thresholds for detecting relatively small impacts, but direct comparisons are difficult because of different acceleration calculation methods, or they have similar relationships even when compared. .

  On the other hand, since the output of “occupant protection device operation requirement ON determination 2” is connected to the AND circuit 23 together with “collision determination”, the AND circuit 23 outputs “1” unless “collision determination” is also established. There is nothing.

  When a relatively small impact occurs in the vehicle A, for example, when the front G sensor 11 detects an acceleration greater than the thresholds III and II, the output of the AND circuit 23 becomes “1”, and the output of the OR circuit 24 becomes “ 1 ". Although the output of “Occupant protection device operation requirement ON determination 1” is connected to the OR circuit 24, it becomes “1” of the OR circuit 24 even if a relatively large impact does not occur in the vehicle A due to the action of the OR circuit. . That is, the output of the OR circuit 24 tends to be “1”. Thus, by making the output of the OR circuit 24 easy to be “1”, the “occupant protection device operation requirement ON determination 1” can be made sensitive.

  Since the output of “passenger protection device non-operation requirement OFF determination” is connected to the AND circuit 25, the output of the OR circuit 24 becomes “1”, and when the “occupant protection device non-operation requirement OFF determination” is satisfied, the airbag Can be expanded.

  According to the above configuration, it is possible to prevent erroneous deployment of the airbag due to vibration of the door portion by the “determination of occupant protection device non-operation requirement OFF”, while when a relatively small impact is applied to the vehicle A, “ By making the occupant protection device operation requirement ON determination 1 "sensitive, the airbag can be deployed without delay.

  For example, when the “collision determination” and the “occupant protection device activation requirement ON determination 2” are satisfied by the acceleration detected by the left front G sensor 11, the occupant protection device 100 is detected by the acceleration detected by the right front G sensor 12. The “SAB or CSA” on the right side is expanded only when “Occupant protection device non-operation requirement OFF determination” is established. Therefore, the occupant of the vehicle A whose behavior becomes unstable due to a slight collision can be protected from the secondary collision without delay.

  According to the occupant protection device 100 of the present embodiment, the “occupant protection device operation requirement ON determination 1” is made more sensitive while the “occupant protection device non-operation requirement OFF determination” is reliably prevented from being erroneously developed due to door vibration. Thus, the passenger of the vehicle A whose behavior becomes unstable can be protected from the secondary collision without delay.

In the present embodiment, an occupant protection device 100 that makes the “occupant protection device non-operation requirement OFF determination” more sensitive will be described.
FIG. 4 is a diagram for explaining air bag deployment requirements in the occupant protection device 100 of the present embodiment. 4 that are the same as those in FIG. 2 are assigned the same reference numerals and descriptions thereof are omitted. In FIG. 4, “Occupant protection device non-operation requirement OFF determination 2” is newly provided. The output of “passenger protection device non-operation requirement OFF determination 2” and the output of “collision determination” are connected to the AND circuit 26. The output of “Occupant protection device non-operation requirement OFF determination 1” is connected to the OR circuit 27, and the output of the OR circuit 27 is connected to the AND circuit 28. The output of “passenger protection device operation requirement ON determination” is connected to the AND circuit 28.

  “Occupant protection device non-operation requirement OFF determination 2” is a non-operation requirement for preventing the SAB or CSA from being erroneously deployed due to door vibration, as in “Occupant protection device non-operation requirement OFF determination 1”. However, the threshold value is smaller than “Occupant protection device non-operation requirement OFF determination 1”. Therefore, even if “occupant protection device non-operation requirement OFF determination 1” is not satisfied for door vibration, “occupant protection device non-operation requirement OFF determination 2” may be satisfied.

  When a relatively small door vibration occurs in the vehicle A and when a relatively small impact occurs in the vehicle A, the output of the AND circuit 26 becomes “1” and the output of the OR circuit 27 becomes “1”. Become. Although the output of “Occupant protection device non-operation requirement OFF determination 1” is connected to the OR circuit 27, the output of the OR circuit 27 can be obtained even if a relatively large door portion vibration does not occur in the vehicle A due to the action of the OR circuit. Tends to be “1”. As described above, the output of the AND circuit 26 connected to the OR circuit 27 together with the “occupant protection device non-operation requirement OFF determination 1” tends to be “1”, so that “occupant protection device non-operation requirement OFF determination 1”. Can be sensitized.

  Since the output of the “occupant protection device operation requirement ON determination” is connected to the AND circuit 28, the output of the OR circuit 27 becomes “1”, and when the “occupant protection device operation requirement ON determination” is satisfied, the airbag is deployed. can do.

  The “occupant protection device non-operation requirement OFF determination 1” can prevent the airbag from being erroneously deployed due to door vibration, while the vehicle A is subjected to a “collision determination” and “ The passenger protection device non-operation requirement OFF determination 2 ”is both established, and the output of the AND circuit 26 is“ 1 ”. For this reason, even if the “occupant protection device non-operation requirement OFF determination 1” is not satisfied, the output of the OR circuit 27 becomes “1”, and if the “occupant protection device operation requirement ON determination” is satisfied, the airbag is delayed. Can be deployed without.

  For example, when the “collision determination” and the “occupant protection device non-operation requirement OFF determination 2” are satisfied by the acceleration detected by the left front G sensor 11, the occupant protection device 100 detects the acceleration detected by the right front G sensor 12. The "SAB or CSA" on the right side is expanded only by satisfying "ON determination of occupant protection device operation requirement". Therefore, the occupant of the vehicle A whose behavior becomes unstable due to a slight collision can be protected from the secondary collision without delay.

  According to the occupant protection device 100 of this embodiment, the “occupant protection device non-operation requirement OFF determination 1” is sensitive to “occupant protection device non-operation requirement OFF determination 1” while reliably preventing erroneous deployment due to door vibration. As a result, the occupant of the vehicle A whose behavior becomes unstable can be protected from the secondary collision without delay.

11, 12 Front G sensor 21, 24, 27 OR circuit 22, 23, 25, 26, 28 AND circuit 100 Crew protection device

Claims (1)

A shock sensor that includes a plurality of impact sensors, and that detects any signal value that is equal to or greater than the first threshold and that does not satisfy the non-operation requirement. In the occupant protection device that deploys the corresponding airbag,
If any of the plurality of impact sensors detects a signal value greater than or equal to a second threshold value less than the first threshold value, it invalidates or sensitizes the determination of the inoperative requirement;
An occupant protection device.

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