WO1999012777A1 - Dispositif et procede pour commander un ensemble coussin gonflable dans un vehicule a moteur - Google Patents

Dispositif et procede pour commander un ensemble coussin gonflable dans un vehicule a moteur Download PDF

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Publication number
WO1999012777A1
WO1999012777A1 PCT/DE1998/002340 DE9802340W WO9912777A1 WO 1999012777 A1 WO1999012777 A1 WO 1999012777A1 DE 9802340 W DE9802340 W DE 9802340W WO 9912777 A1 WO9912777 A1 WO 9912777A1
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WO
WIPO (PCT)
Prior art keywords
inflation
impact
gas bag
occupant
volume
Prior art date
Application number
PCT/DE1998/002340
Other languages
German (de)
English (en)
Inventor
Walter Baumgartner
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1999012777A1 publication Critical patent/WO1999012777A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use

Definitions

  • the invention relates to a device and a method for controlling an airbag arrangement in a motor vehicle.
  • a known device for controlling an airbag arrangement in a motor vehicle has an impact detection device and a control circuit which, depending on data from the impact detection device, initiates the inflation of an airbag which can be filled to different volume levels or with different inflation speeds.
  • a filling volume or an inflation speed is calculated before the gas bag is actually initiated. With the filling volume determined in this way or the inflation speed determined in this way, the gas bag is inflated when the impact detection device has recognized a sufficiently strong negative vehicle acceleration.
  • Such a device adapts the filling quantity of the gas bag to the occupant position determined when the filling process is initiated.
  • the airbag does not offer protection adapted to the occupant position guaranteed.
  • the airbag can injure the occupant due to an excessive filling volume or an excessive impact speed.
  • the object of the invention is therefore to provide a control system for an airbag arrangement in a motor vehicle which avoids the disadvantages of the known control system and which, in particular, ensures the best possible and, in particular, low-pulse catching effect of the airbag for the occupants.
  • the part of the object of the invention relating to the device is solved by the features of claim 1.
  • the part of the object of the invention relating to the method is solved by the features of claim 5.
  • the control circuit adjusts the airbag volume to be reached or the inflation speed after the airbag has been inflated.
  • the change in the filling volume or the inflation speed caused by the adjustment depends in particular on current data from the impact detection device and / or from current data from a device for occupant or object detection. These current data reflect in particular the impact situation or the occupant or object position after the gas bag has been inflated.
  • the catching effect of the gas bag can be adapted extremely precisely to the current impact situation or occupant position, so that the momentum balance of the inflating airbag and displacing occupant is as low as possible is. In this way, the occupant is effectively protected by the gas bag without being injured by the inflation of the gas bag.
  • the device according to the invention and the method according to the invention allow continuous changes or changes in discrete stages of the filling volume already achieved or intended to be achieved or the inflation speed or the inflation pressure.
  • FIG. 1 shows a block diagram of the device according to the invention
  • FIG. 2 shows a flow chart for the method according to the invention
  • FIG. 3 shows the course of the filling volume of a gas bag changing over time, controlled by the method steps according to the invention.
  • FIG. 1 shows a device according to the invention for controlling an airbag arrangement 4 in a motor vehicle with an impact detection device 1, an occupant detection device 2 and a control circuit 3.
  • the impact detection device 1 supplies data d a to the control circuit 3, preferably in the form of signals.
  • the Impact detection device 1 preferably contains one
  • Acceleration sensor for detecting a deceleration of the motor vehicle caused by an impact and / or a proximity sensor, e.g. B. an ultrasonic sensor for detecting the approach of an obstacle to the motor vehicle and / or an impact sensor, for. B. in the form of a force or pressure sensor to detect the intrusion of an obstacle in the motor vehicle.
  • the sensitivity axis of these sensors is oriented in the direction from which an impact is to be detected, that is to say, for example, parallel to the longitudinal axis of the vehicle for detecting a front, rear or oblique impact or transversely to the longitudinal axis of the vehicle for detecting a side impact.
  • the individual sensors can be outsourced, that is to say arranged on the edge of the vehicle and thus close to the potential impact location, or else together with the control circuit 3 in a central position in the vehicle - for example on the vehicle tunnel - in a common control unit.
  • the data d a supplied to the control circuit 3 can represent continuous analog signals or already discretized digital data. In any case, the control circuit 3 can distinguish at least with the aid of the data d a provided by the impact detection device 1 whether there is a sufficiently strong impact to trigger one or more occupant protection devices.
  • the occupant recognition device 2 can preferably distinguish one vehicle seat occupied by an occupant, one occupied by an object and one unoccupied. Furthermore, the occupant recognition device can preferably determine the occupant position, but at least classify it. Accordingly, the occupant recognition device 2 data d x to the control circuit 3.
  • the occupant detection device 2 can use a number of different sensor principles: for example a weight detection or a query of the belt buckle status to distinguish between an occupied or an unoccupied vehicle seat. to
  • Occupant position detection can e.g. B. capacitive, infrared - ultrasonic or other sensors can be used.
  • the control circuit 3 is preferably designed as a microprocessor which receives the data d a and d x , possibly converts and evaluates it.
  • the control circuit 3 is connected via lines to gas bag arrangements 41, 42 and 43.
  • Each gas bag arrangement 41, 42, 43 contains one or more gas generators 411, 4211, 4212, 4213, 4311, 4312, 4313, and associated gas bags 412, 422, 433 with one or more chambers 412, 4221, 4222, 4223, 432.
  • each gas generator 411, 4211, 4212, 4213, 4311, 4312, 4313 an ignition element (not shown) which is ignited by the application of a high-energy current pulse Z 0 to Z 6 , the gas generator being released during the ignition to release gas by the energy released during ignition - e.g. B. for burning tablets with the release of gas - caused.
  • the first gas bag arrangement 41 has a conventional gas bag 412 with only one chamber.
  • the gas generator 411 receives the ignition signal Z 0 from the control circuit 3.
  • the second gas bag arrangement 42 has three gas generators 4211, 4212, 4213, each of which is assigned a chamber 4221, 4222, 4223 of the gas bag 422.
  • Each gas generator 4211, 4212, 4213 can be ignited by its own, individual ignition signal Z lr Z 2 , Z 3 .
  • the control circuit 3 decides when about selection, order and time offset between the
  • the third gas bag arrangement 43 contains three gas generators 4311, 4312, 4313, the gas of which, when ignited, flows into a common gas bag 432 with only a single chamber.
  • control circuit 3 If the control circuit 3 recognizes on the basis of the data d a from the impact detection device 1 that there is a front impact, it initiates, for example, the inflation of the first chamber / volume stage 4221 of the gas bag arrangement 42 by actuating the gas generator 4211 with the ignition signal Z x . At the same time, the control circuit 3 generates an ignition pulse Z 4 for the gas generator 4311 of the third gas bag arrangement. If, in the second gas bag arrangement 42, each gas generator 4211, 4212, 4213 is designed such that it provides gas for completely filling the chamber 4221, 4222, 4223 assigned to it, each gas generator 4311, 4312, 4313 of the third gas bag arrangement 43 is designed such that he can fill the entire chamber 432 with gas.
  • data d a and data d x from the impact detection device 1 and the occupant detection device 2 are recorded and processed by the control circuit 3, so that even after the inflation has been initiated, at least a first gas bag chamber / volume stage Impact situation and / or the occupant position and in particular changes in the impact situation or the occupant position can be recognized and evaluated by the control unit 3. If a change in the crash situation or the occupant position compared to the time at which, for example, the ignition signals Z ⁇ and Z 4 were emitted, is significant and in particular exceeds a threshold value, is indicated by the control circuit 3 reacts to the changed impact situation or the changed occupant position.
  • control circuit 3 detects, for example, during the impact that the impact intensity is greater than originally assumed and the occupant is at the same time in a sitting position which allows the associated gas bag to be inflated to a greater extent, then in a further step by generating the ignition signals Z 2 for the gas generator 4212 and Z 3 for the gas generator 4213 and the ignition signals Z 5 and Z 6 for the gas generators 4312 and 4313, the gas bags 422 and 432 are inflated to a larger volume level or faster than previously to the intended volume level.
  • FIG. 3 shows the filling volume of a gas bag over time in three figures.
  • 3a is based on the gas bag arrangement 42 from FIG. 1.
  • the control circuit 3 detects a slight impact, which requires the gas bag 422 to be inflated at least to its volume V 1 #, ie, the gas generator 4211 to inflate at least the first chamber 4221.
  • the first chamber 4221 is filled to volume V x with gas.
  • control circuit 3 recognizes that the impact is stronger than assumed at time t x , so that a larger gas bag volume is required for effective protection. Because of this, the ignition signal Z 2 for the gas generator 4212 is generated by the control circuit 3 at the time t 3 .
  • the second chamber 4222 is completely filled to its volume V 2, so that the entire volume content V tot of the gas bag 422 is additively composed of the volume V, and V 2 of the
  • Chambers 4221 and 4222 composed and the vehicle occupants provides the best possible health-friendly protection for the present impact on the vehicle seat.
  • each gas generator 4311, 4312, 4313 releasing the chamber 432 with only one gas Partial volume V 1; V 2 , V 3 can fill.
  • gas generator 4311 only supplies gas for volume V x according to FIG. 3a
  • gas generator 4312 only supplies gas volume V 2 according to FIG. 3a.
  • this gas bag arrangement 43 is also distinguished by the same volume filling profile V tot (t) as the gas bag arrangement 42 described above.
  • volume filling curve V tot In the case of the volume filling curve V tot according to FIG. 3a), it is assumed that a change in the volume filling stage V x is only considered necessary at a point in time t 3 at which at least the first volume filling stage V x has already been fully reached.
  • the original decision to inflate only one stage of a multi-stage gas bag can also be revised at a time when the inflation process of this first chamber has not yet been completed.
  • the ignition signal Z for the gas bag arrangement 42 is again generated at the time t.
  • the first chamber 4212 is then continuously filled with gas and would be completely filled to volume V- at time T 3 .
  • the gas generator has released all of its gas corresponds to a slowdown in the inflation speed in relation to the total volume to be inflated. It is irrelevant whether the gas from the generators flows into a common chamber or into separate chambers of the gas bag.
  • the gas generators are actuators for the controlled inflation of a gas bag to different volume levels or with different inflation speeds.
  • a valve arranged between the gas generator and the gas bag can be used as the actuator, which continuously controls the amount of gas flowing into the gas bag or the chamber.
  • a valve can also be used as an actuator, which in its open state allows air or gas to flow out of the gas bag or from the chamber.
  • the lower branch of the drawn in Figure 3c Graphene indicates the filling process for an airbag with such a / drain valve.
  • the control circuit 3 recognized that the occupant had already advanced to a large extent in the direction of the unfolding gas bag and that further inflation was therefore a danger.
  • a valve arranged between chamber 4221 and the surroundings is opened by control circuit 3, so that chamber 4221 is not inflated to its intended maximum filling quantity V- L but only to a small volume V 0 .
  • control circuit 3 By opening said valve, gas entering the chamber 4221 from the gas generator 4211 between the time t 2 and the time t 3 flows through the valve out of the chamber 4221 to the same extent.
  • the valve is closed again, so that the total filling volume V tot remains constant V 0 .
  • FIG. 3b describes the filling of the gas bag arrangement 43 in accordance with FIG. 1, with each gas generator 4311, 4312, 4313 storing a sufficient amount of gas in order to completely fill the single chamber 432 to the volume V.
  • a valve is arranged between chamber 432 and the surroundings, so that gas can be released from the chamber 432 to the surroundings in a controlled manner, as a result of which the filling quantity of the chamber 432 is made variable.
  • the valve is opened slightly so that the entire inflowing gas quantity does not flow out via the valve.
  • FIG. 2 shows a flow chart for the method according to the invention.
  • step S1 data d a of the impact detection device 1 in are stored in step S2 the control circuit 3 is read in and evaluated in step S3. If it is recognized in step S4 that there is a sufficiently severe impact to ignite at least one stage of the gas bag, the process continues with step S5 in that at least this first stage of the gas bag is triggered by an associated ignition signal. If no such severe impact is detected, new data d a of the impact detection device 1 are read in with step S2. Even after the inflation of the first stage of the gas bag has been initiated in step S5, in particular data d x of an occupant detection device 2 are read into the control circuit 3 in step S6 and evaluated in step S7.
  • step S8 If it is determined in step S8 that, based on this current data d x, the occupant position has changed significantly compared to an occupant position at a previous point in time - for example with step S2 - then in step S10 the inflation speed or the filling volume to be achieved of the associated gas bag arrangement is determined Generation of further control signals corrected or changed. If it is not necessary to change the triggering decision made in step S4, data d x of the occupant detection device 2 in particular are also read in with step S6 and checked in step S7.
  • step S10 the occupant position or the impact situation can continue to be observed even after step S10 and further corrections can be initiated by further actuating signals if necessary.
  • step Sll the invention

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)

Abstract

L'invention concerne un dispositif pour commander un ensemble coussin gonflable dans un véhicule à moteur, ledit dispositif présentant un circuit de commande (3) qui déclenche, en fonction de données (a) d'une unité de détection d'impact (1), le gonflement d'un coussin (422, 432) pouvant être rempli à différents degrés de volume (4221, 4222, 4223). Ce volume (4221, 4222, 4223) est ajusté après le déclenchement du gonflement du coussin (422, 432), en fonction des données (a) de l'unité d'identification de collision (1) et/ou des données (x), à un moment précis, d'une unité de détection d'objet ou d'occupant (2).
PCT/DE1998/002340 1997-09-11 1998-08-13 Dispositif et procede pour commander un ensemble coussin gonflable dans un vehicule a moteur WO1999012777A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19740020.5 1997-09-11
DE1997140020 DE19740020A1 (de) 1997-09-11 1997-09-11 Einrichtung und Verfahren zum Steuern einer Gassackanordnung in einem Kraftfahrzeug

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Publication Number Publication Date
WO1999012777A1 true WO1999012777A1 (fr) 1999-03-18

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PCT/DE1998/002340 WO1999012777A1 (fr) 1997-09-11 1998-08-13 Dispositif et procede pour commander un ensemble coussin gonflable dans un vehicule a moteur

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DE (1) DE19740020A1 (fr)
WO (1) WO1999012777A1 (fr)

Cited By (1)

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US6581961B1 (en) 1999-12-17 2003-06-24 Trw Vehicle Safety Systems Inc. Deactivation of second stage of air bag inflator

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EP1031475A3 (fr) * 1999-02-26 2002-01-23 Breed Automotive Technology, Inc. Système de protection en cas de choc arrière
US6250672B1 (en) * 2000-08-18 2001-06-26 Ford Global Technologies, Inc. Vehicle airbag restraint system with deactivation indicator
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DE10252227A1 (de) 2002-11-11 2004-05-27 Robert Bosch Gmbh Verfahren zur Ansteuerung von Rückhaltemitteln
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DE102004001480A1 (de) * 2004-01-09 2005-08-04 Conti Temic Microelectronic Gmbh Vorrichtung und Verfahren zur Einstellung eines Auslöseschwellwertes einer Insassenschutzeinrichtung in einem Fahrzeug
DE102004009300A1 (de) * 2004-02-26 2005-09-15 Robert Bosch Gmbh Insassenschutzvorrichtung
DE102004042600A1 (de) * 2004-09-03 2006-03-09 Conti Temic Microelectronic Gmbh Vorrichtung und Verfahren zur Ansteuerung eines Airbagsystems
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US8463500B2 (en) * 2006-03-30 2013-06-11 Ford Global Technologies Method for operating a pre-crash sensing system to deploy airbags using inflation control
US8554461B2 (en) 2007-02-19 2013-10-08 Ford Global Technologies, Llc System and method for pre-deploying restraints countermeasures using pre-crash sensing and post-crash sensing
DE102007031913A1 (de) * 2007-07-09 2009-01-15 GM Global Technology Operations, Inc., Detroit Airbag-Modul mit einem Luftsack und Verfahren zum Befüllen des Luftsackes
DE102008005272A1 (de) * 2008-01-19 2009-07-23 Autoliv Development Ab Sicherheitseinrichtung für ein Fahrzeug und Verfahren zur Steuerung einer Sicherheitseinrichtung
KR101655569B1 (ko) * 2014-11-12 2016-09-08 현대자동차주식회사 차량용 승객 보호시스템 및 방법

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Publication number Priority date Publication date Assignee Title
US6581961B1 (en) 1999-12-17 2003-06-24 Trw Vehicle Safety Systems Inc. Deactivation of second stage of air bag inflator

Also Published As

Publication number Publication date
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