DE102006024666B4 - Method and device for impact detection - Google Patents

Method and device for impact detection

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Publication number
DE102006024666B4
DE102006024666B4 DE102006024666.7A DE102006024666A DE102006024666B4 DE 102006024666 B4 DE102006024666 B4 DE 102006024666B4 DE 102006024666 A DE102006024666 A DE 102006024666A DE 102006024666 B4 DE102006024666 B4 DE 102006024666B4
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Germany
Prior art keywords
impact
air pressure
device
difference
signals
Prior art date
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Active
Application number
DE102006024666.7A
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German (de)
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DE102006024666A1 (en
Inventor
Alfred Kuttenberger
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Priority to DE102006024666.7A priority Critical patent/DE102006024666B4/en
Publication of DE102006024666A1 publication Critical patent/DE102006024666A1/en
Application granted granted Critical
Publication of DE102006024666B4 publication Critical patent/DE102006024666B4/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013Electrical 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 collisions, impending collisions or roll-over
    • B60R21/0136Electrical 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 collisions, impending collisions or roll-over responsive to actual contact with an obstacle, e.g. to vehicle deformation, bumper displacement or bumper velocity relative to the vehicle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R2021/0002Type of accident
    • B60R2021/0006Lateral collision
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/21Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components in vehicle side panels, e.g. doors

Abstract

A device for impact detection, wherein the device is configured such that the device detects the impact in response to signals from air pressure sensors (PPSr1, PPSr2, PPSl1, PPSl2) disposed in side panels of a vehicle (10), the device being an evaluation circuit (μC), the signals from in the vehicle (10) opposite air pressure sensors (PPSr1, PPSr2, PPSl1, PPSl2) for impact detection linked together, characterized in that the link is a difference and the evaluation circuit (μC) has a sign recognition, which checks whether the difference is positive or negative, the evaluation circuit (.mu.C) determining an impact location as a function of a sign signal from the sign recognition.

Description

  • State of the art
  • The invention relates to a device or a method for impact detection according to the preamble of the independent claims.
  • Out DE 102 37 162 A1 It is known to detect an impact by means of a pressure signal. The pressure signal is normalized. The EP 1 358 093 B1 shows a method for impact detection, in which a difference between signals of opposing acceleration sensors is formed. The DE 10 2004 008 616 A1 discloses a method and apparatus for detecting air pressure in a vehicle. The DE 10 2004 007 800 A1 describes a device for side impact detection using air pressure sensors. The DE 102 37 160 A1 shows an apparatus for impact detection with at least two air pressure sensors. The DE 102 10 925 A1 discloses a method for checking the operability of an air pressure sensor in a vehicle. The DE 101 19 781 C1 discloses an occupant protection system having a central control unit to which are connected two acceleration sensors arranged respectively on the opposite vehicle doors. The two acceleration sensors absorb accelerations acting on the vehicle transversely to the vehicle axle. In the control unit, the amount of the difference of the acceleration values of the two acceleration sensors is formed. Depending on the time course and the amplitude curve of the difference, a side impact is concluded. It is further disclosed that, among other things, signals of door-mounted pressure sensors or acceleration sensors arranged in the area of the doors can be used for side-impact protection.
  • Disclosure of the invention
  • The inventive device for impact detection and the inventive method for impact detection have the advantage that an algorithm is not calculated for each pressure signal, but the pressure signals are linked together and then calculates the algorithm with this link. This leads to a gain in terms of memory requirements and computing time.
  • Advantageous improvements of the device for impact detection specified in the independent patent claims or the method for impact detection specified in the independent patent claims are possible by the measures and developments listed in the dependent claims.
  • It is particularly advantageous that the link is a difference. The air pressure signals from opposing air pressure sensors are subtracted from each other. The difference is then processed. If an impact occurs, for example on the right side, then the air pressure sensor on the left side will deliver only a very weak to no signal. In contrast, the air pressure sensor on the right side will provide a very strong signal. The difference is therefore, after subtracting the noise thresholds, equal to the air pressure signal on the right side, ie on the side on which the impact took place. This makes it clear that subtraction is a very easy way to save resources and memory and computation time.
  • In an advantageous development it is provided that in addition a sign recognition is provided which checks whether the difference is positive or negative. This determines whether the impact has occurred on the right or on the left side. This can then be controlled the correct personal protection. In addition to subtraction, other linking options can be given. The sign recognition and the difference formation take place in the evaluation circuit of the device according to the invention and thus preferably in a microcontroller in a control device as the device.
  • Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description.
  • Show it
  • 1 a configuration of the device according to the invention with the outsourced air pressure sensors,
  • 2 a block diagram,
  • 3 a first flowchart and
  • 4 a second flowchart.
  • For side impact detection, an air pressure sensor can be used. For this purpose, the air pressure sensor in a side part, such as a door, installed, so that in an impact on the door, the air volume in the door is compressed so that a rapid increase in air pressure can be measured. This signal can then be used for impact sensing. As is customary with personal protection systems, a plausibility check must also be provided. This can be done by an acceleration sensor, for example in the B-pillar, an environment sensor or another pressure sensor.
  • According to the invention it is proposed not to evaluate each individual air pressure signal, whether an impact is present or not, but first to link the air pressure signals with each other and that the signals from mutually opposite air pressure sensors. As a combination, a difference can preferably be used. The difference allows once a slight further processing, since the air pressure sensor that experiences the impact, generates a much larger signal than the opposite sensor and the sign of the impact location can be determined, ie which side.
  • 1 shows a representation of a configuration of the device according to the invention with the outsourced pressure sensors and to be controlled personal protection RHS. In a vehicle, a control unit SG is provided, which acts as an airbag control unit. This control unit SG is installed, for example, in the area of the vehicle tunnel. For side impact detection, here are four air pressure sensors PPSr1, PPSr2, PPSl1 and PPSl2. These air pressure sensors are usually manufactured micromechanically and can detect an increase in air pressure due to a side impact on the side part in which the respective air pressure sensors are located. Signal lines of the air pressure sensors are led to the control unit SG. There they are connected to an interface module IF. The interface module then transmits the data to a microcontroller .mu.C as the evaluation circuit. The microcontroller μC combines the signals from opposing air pressure sensors and uses the difference to calculate the triggering algorithm. If it comes to the trigger case, then the microcontroller μC controls an ignition circuit FLIC, which leads to the energization of an ignition element in the restraint RHS and thus contributes, for example, to the inflation of an airbag.
  • The air pressure sensors PPSr1, PPSr2 and PPSl1, PPSl2 are here connected to the control unit SG via point-to-point connections. It is possible to provide a bus connection, ie a sensor bus, for this purpose. In the control unit SG only the essential components of the invention are given. Other, necessary for the operation of the control unit SG components are not shown, if they do not contribute to the function of the proposed invention. Other sensors that the control unit SG needs to form the drive decision of the restraint means RHS are not shown here, such as, for example, a plausibility sensor system.
  • The microcontroller .mu.C as the evaluation circuit links the signals from opposing air pressure sensors, for example PPSr1 and PPSl1, forms a difference, checks the sign and processes the difference value in a triggering algorithm in order to decide whether a triggering of the person protection means to be controlled should take place or not , The sign indicates on which side the personal protective equipment is to be used.
  • 2 shows a block diagram of an embodiment of the device according to the invention or of the method according to the invention. On the left are the signals of the air pressure sensors PPSr1, PPSr2, PPSl1 and PPSl2. It is possible that only two air pressure sensors, such as PPSr1 and PPSl1, are provided. The signals from opposite air pressure sensors are in the gates 20 and 21 guided. There is generally the linking of the signals and here in particular the difference. In addition, in the blocks 20 and 21 a sign detection exists that sends the appropriate signal to the blocks 24 respectively. 27 to determine if the sign is positive or negative. The difference is then in another signal branch, for example by the block 25 , integrated or somehow differently pre-processed or even so left, then on the threshold decision maker 26 to go. The threshold decision maker 26 has a trigger threshold. If this is exceeded, then a release of the personal protection means is displayed. This also applies to the blocks in the example below 28 and 29 to. The threshold decision makers 26 and 29 However, they can have variable thresholds that depend, for example, on the pressure signal itself. But other signals can influence here instead or in addition. In the blocks 22 and 23 is then decided on the basis of these data, whether and which personal protection devices are to be controlled.
  • Not shown here is the test of whether the noise threshold has been exceeded by the air pressure signal or not. However, such an audit is always done. In the present case, the noise threshold is about 8 mbar pressure change. It is possible to deviate from this, even 4 mbar or 20 mbar are possible. An adaptive noise threshold is also possible, which is set, for example, as a function of a signal from an environmental sensor system.
  • 3 shows in a flow chart the flow of the inventive method. In process step 300 The air pressure signals are generated by the air pressure sensors PPSr1, PPSr2, PPSl1 and PPSl2. In process step 301 then takes place the linkage of air pressure sensor signals from mutually opposite air pressure sensors. This may be subtraction, averaging, or other mathematical operations suitable here. The resulting signal is then a threshold decision 302 fed. The threshold can, as I said, be designed variable or fixed. If the threshold value was exceeded by the differential pressure signal, this is in process step 303 determined, then the triggering takes place in process step 304 , However, if the threshold has not been exceeded, then in process step 305 the procedure ends.
  • 4 shows a further embodiment of the method according to the invention for impact detection. In process step 400 In turn, the air pressure signals are generated. In process step 401 the difference takes place. This is in process step 402 compared with a threshold, wherein in process step 403 was determined whether it was under or exceeded. If it has been exceeded, then it is in procedural step 405 Determines whether the sign is positive or negative by the sign recognition. If it is positive, then the personal protection device on the right side in process step 406 activated. If it is negative then it will be in procedural step 407 activates the personal protection device on the left side. However, was in process step 403 determined that the threshold is not exceeded, then is in process step 404 the procedure ends.

Claims (2)

  1. A device for impact detection, wherein the device is configured such that the device detects the impact in response to signals from air pressure sensors (PPSr1, PPSr2, PPSl1, PPSl2), which are in side parts of a vehicle ( 10 ), wherein the device has an evaluation circuit (.mu.C) which detects signals from in the vehicle ( 10 ) linked to each other for impact detection, characterized in that the link is a difference and the evaluation circuit (.mu.C) has a sign recognition, which checks whether the difference is positive or negative, wherein the evaluation circuit (.mu.C) determines an impact location as a function of a sign signal from the sign recognition.
  2. Method for impact detection, wherein the impact is dependent on signals from air pressure sensors (PPSr1, PPSr2, PPSl1, PPSl2) which are located in side parts of a vehicle ( 10 ) are detected, wherein for the impact detection, the signals from in the vehicle ( 10 ) are linked to each other, characterized in that the link is a difference and it is checked whether the difference is positive or negative, and an impact location in dependence on a sign signal is determined.
DE102006024666.7A 2006-05-26 2006-05-26 Method and device for impact detection Active DE102006024666B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102006024666.7A DE102006024666B4 (en) 2006-05-26 2006-05-26 Method and device for impact detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006024666.7A DE102006024666B4 (en) 2006-05-26 2006-05-26 Method and device for impact detection

Publications (2)

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DE102006024666A1 DE102006024666A1 (en) 2007-11-29
DE102006024666B4 true DE102006024666B4 (en) 2017-09-28

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008011165B4 (en) * 2008-02-26 2017-05-04 Autoliv Development Ab Sensor arrangement for an occupant protection system of a motor vehicle
DE102008043644A1 (en) 2008-11-11 2010-05-12 Robert Bosch Gmbh Pressure sensor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10119781C1 (en) * 2001-04-23 2002-08-22 Siemens Ag Control unit and method for detecting the type of impact in an occupant protection system
DE10210925A1 (en) * 2002-03-13 2003-10-02 Bosch Gmbh Robert Procedure for checking the functionality of a pressure sensor
DE10237160A1 (en) * 2002-08-14 2004-02-26 Robert Bosch Gmbh Device for sensing a motor vehicle impact has at least two pressure sensors connected to a processor which transmits a value to further motor vehicle systems
DE10237162A1 (en) * 2002-08-14 2004-02-26 Robert Bosch Gmbh Crash or collision sensor for a motor vehicle has at least one pressure sensor, the output signal of which is normalized with the atmospheric pressure prior to processing in a control unit processor
EP1358093B1 (en) * 2001-01-27 2004-08-18 Robert Bosch Gmbh Method for sensing side impacts in a vehicle
DE102004008616A1 (en) * 2004-02-21 2005-09-08 Robert Bosch Gmbh Device and system for use of data about atmospheric pressure from airbag control system for other important functions
DE102004007800A1 (en) * 2004-02-18 2005-09-08 Robert Bosch Gmbh Device for side impact detection

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1358093B1 (en) * 2001-01-27 2004-08-18 Robert Bosch Gmbh Method for sensing side impacts in a vehicle
DE10119781C1 (en) * 2001-04-23 2002-08-22 Siemens Ag Control unit and method for detecting the type of impact in an occupant protection system
DE10210925A1 (en) * 2002-03-13 2003-10-02 Bosch Gmbh Robert Procedure for checking the functionality of a pressure sensor
DE10237160A1 (en) * 2002-08-14 2004-02-26 Robert Bosch Gmbh Device for sensing a motor vehicle impact has at least two pressure sensors connected to a processor which transmits a value to further motor vehicle systems
DE10237162A1 (en) * 2002-08-14 2004-02-26 Robert Bosch Gmbh Crash or collision sensor for a motor vehicle has at least one pressure sensor, the output signal of which is normalized with the atmospheric pressure prior to processing in a control unit processor
DE102004007800A1 (en) * 2004-02-18 2005-09-08 Robert Bosch Gmbh Device for side impact detection
DE102004008616A1 (en) * 2004-02-21 2005-09-08 Robert Bosch Gmbh Device and system for use of data about atmospheric pressure from airbag control system for other important functions

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