WO2006131224A1 - Procede de commande pour dispositif de protection contre les accidents dans un vehicule - Google Patents

Procede de commande pour dispositif de protection contre les accidents dans un vehicule Download PDF

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Publication number
WO2006131224A1
WO2006131224A1 PCT/EP2006/005075 EP2006005075W WO2006131224A1 WO 2006131224 A1 WO2006131224 A1 WO 2006131224A1 EP 2006005075 W EP2006005075 W EP 2006005075W WO 2006131224 A1 WO2006131224 A1 WO 2006131224A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency range
sensor
control method
khz
frequency
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2006/005075
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German (de)
English (en)
Inventor
Edgar Bihler
Thomas Lohfink
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of WO2006131224A1 publication Critical patent/WO2006131224A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B60R21/013—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 collisions, impending collisions or roll-over
    • B60R21/0132—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 collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • B60R21/01332—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 collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value by frequency or waveform analysis
    • 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
    • B60R21/013—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 collisions, impending collisions or roll-over
    • B60R21/0132—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 collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • 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
    • B60R21/013—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 collisions, impending collisions or roll-over
    • B60R2021/01302—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 collisions, impending collisions or roll-over monitoring vehicle body vibrations or noise

Definitions

  • the invention relates to a control method for an accident prevention device in a vehicle according to the preamble of claim 1.
  • a control device for an accident protection device in a vehicle which comprises at least one acceleration sensor, an evaluation circuit for evaluating the output signals of the acceleration sensor and a control unit which activates elements of the accident protection device in the presence of predetermined conditions.
  • the acceleration sensor is sensitive in a wide frequency range, ranging from frequencies below 5 Hz to over 10 kHz.
  • the evaluation circuit the output signals lying in the structure-borne sound frequency range are also evaluated. This makes it possible to evaluate the resulting in a crash higher-frequency structure-borne sound signals in addition to the low-frequency signals that detect the total vehicle acceleration. This is to detect a crash safely and in good time.
  • frequencies below 300 Hz are provided by means of a low-pass filter and frequencies above 4 kHz are provided to the evaluation circuit by means of a high-pass filter. represents, which correspond to the respective vehicle acceleration and the respective structure-borne sound.
  • DE 102 27 061 A1 describes a restraint system with restraint means, with at least one acceleration-sensitive sensor and at least one ultrasonic sensor.
  • the ultrasonic sensor is sensitive to the ultrasonic waves generated in the event of a crash, a trigger criterion for the retaining means being derived from its output signal.
  • NON-Fire load cases Crash tests in which no accident prevention devices, in particular restraint systems, are to be activated, are referred to as NON-Fire load cases.
  • all attempts in which a release of the restraint systems is necessary referred to as fire load cases.
  • the common method for analyzing the acceleration signals always has the problem of ensuring the timely triggering of certain fire load cases, without at the same time triggering the NON-Fire load cases.
  • the additional evaluation of a higher-frequency structure-borne sound component is proposed to solve this problem.
  • the invention has for its object to provide a control method for an accident prevention device in a vehicle, which guarantees a more reliable and optimized release of the accident protection device than the prior art.
  • the object is achieved by a control method for an accident prevention device in a vehicle, in which signals are sensed in a wide frequency range with at least one vibration-sensitive sensor, the lying in the structure-borne sound frequency range output signals and the low-frequency output signals of the sensor by means of an evaluation circuit and activation of the Accident protection device depending on the evaluation of the output signals by a control unit, with the features of claim 1.
  • the output signals of the sensor are evaluated in a frequency range between 400 Hz and 5 kHz.
  • a frequency analysis clearly shows that most of the signals detected by the accelerometer are below 5 kHz.
  • the signals up to 400 Hz are usually used in conventional acceleration sensors for detecting the total acceleration of the vehicle. In the frequency range from 400 Hz to 5 kHz, this contains the structure-borne sound information that is significant for a reliable load case distinction.
  • the structure-borne noise is evaluated in a narrow frequency band, which depends on the vehicle type.
  • Programmtechnisch a suitable frequency band with respect to location and bandwidth can be determined, for which an optimal separation between Fire and NON-Fire load cases can be realized and thus a temporally optimal activation of the accident protection device is guaranteed.
  • Content of the program is the systematic investigation all possibilities to optimize the separation between Fire and NON-Fire experiments.
  • a suitable evaluation criterion was created, which represents the quotient of the most unfavorable combination of Fire and NON-Fire signals.
  • the smallest integral value of the Fire attempts at each point in the crash course is divided by the maximum integral value of the NON-Fire attempts. This gives you the size factor between the two.
  • the factor represents the percentage signal ratio between the two. If the factor is one or less one, then the separation between Fire and NON-Fire attempts is not possible. It is assumed that a fixed bandpass width, which is gradually pushed through the frequency range up to 20 kHz. This then gives the bandpass width the safety factor at appropriately named times. For this, the signals are filtered, the integrals formed and the values stored at the respective times. These are expressed as a result of a safety factor between NON-Fire and Fire tests. In practice, a bandwidth of approximately 500 Hz to 2 kHz has proven particularly suitable for the narrow frequency band in a situation around 2 kHz.
  • Fig. 1 is a block diagram of a controller for an accident prevention device in a vehicle; 2 shows a frequency analysis spectrum of a vibration-sensitive sensor for a frontal impact;
  • Fig. 3a and 3b respectively signal amplitudes of a sensor in
  • FIGS. 4a and 4b each show integrals for bandpass filtering.
  • the controller 1 shows a controller 1 for an accident prevention device 2, in particular a restraint system, for example an airbag system, in a vehicle, not shown.
  • the controller 1 has a vibration-sensitive sensor 3 with an integrated preamplifier, which in this embodiment, a repeater 4 for adjusting the output signal of the sensor 3 is connected downstream.
  • the sensor 3 may in particular be an ultrasonic sensor, an acceleration sensor and / or a structure-borne sound sensor. With the sensor 3, the sound generated in the vehicle and a vehicle deceleration are detected during a crash. It is also possible to provide a plurality of sensors 3 for sensing the low-frequency frequency range and / or the higher-frequency frequency range as part of a device. Sound is generally referred to as vibrations in the frequency range between 16 and 16 kHz. Depending on the medium in which the periodic oscillation is sensed, it can be airborne sound, liquid sound and structure-borne sound.
  • a power amplifier 5 is connected to a low-pass filter whose output is connected to a control unit 6. With the control unit, the accident prevention device 2 is activated.
  • an evaluation unit 7 is arranged, to which the output signal of the repeater 4 is supplied.
  • the evaluation unit 7 may comprise a bandpass filter for filtering out a suitable frequency range and a low-pass filter for envelope formation.
  • the evaluation unit 7 is also connected to the control unit 6.
  • the repeater 4, the power amplifier 5 and the evaluation unit 7 are part of an evaluation circuit 4, 5, 7th
  • signals in a wide frequency range are sensed with the vibration-sensitive sensor 3.
  • the output signals lying in the structure-borne sound frequency range and the low-frequency output signals of the sensor 3 are evaluated by means of the evaluation circuit 4, 5, 7.
  • the high-frequency sound, which arises in a crash of the vehicle, is filtered out by means of the evaluation unit 7 from the output signal of the sensor 3 and provided to the control unit 6.
  • the low-frequency output signals probed via the power amplifier 5 with the integrated low-pass filter from the output signal of the sensor 3 indicate the total vehicle deceleration.
  • structure-borne sound information and acceleration information are made available to the control method.
  • Activation of the accident prevention device 2 takes place as a function of the evaluation of the output signals by the control unit 6.
  • Fig. 2 shows a frequency analysis spectrum of the sensor 3 for a frontal impact after processing with a Fast Fourier Transform (FFT).
  • FFT Fast Fourier Transform
  • This frequency analysis shows that most signals are not found in the upper frequency range, but rather below 5 kHz.
  • the signals in the frequency range between 0 and 400 Hz correspond to those of a conventional sensor 3 for the total acceleration of the vehicle.
  • the crash range-containing frequency range is therefore between 400 Hz and 5 kHz, in particular between 400 Hz and 4 kHz.
  • the signal amplitude of the sensor 3 as a function of the crash time and of the frequency is shown in the diagrams of FIGS. 3a and 3b, FIG. 3a representing a fire load case and FIG. 3b a non-fire load case.
  • FIGS. 3a and 3b The signal amplitude of the sensor 3 as a function of the crash time and of the frequency is shown in the diagrams of FIGS. 3a and 3b, FIG. 3a representing a fire load case and FIG. 3b a non-fire load case.
  • the significant signal input is given.
  • the signal entry for the fire load case must be clearly differentiated from the signal entry for the NON-Fire load case for this lower frequency range.
  • a separation of Fire load cases and NON-Fire load cases is thereby given for this lower frequency range with a high safety factor, which is a measure of the quality of the separation.
  • a high safety factor which is a measure of the quality of the separation.
  • no reliable separation of Fire load cases and NON-Fire load cases is possible for the specified in DE 100 15 273 Al body sound frequency range above 5 kHz and thus no security against false triggering of accident prevention device 2 is guaranteed.
  • a possible narrow frequency band has a preferred width of about 500 Hz to 1.5 kHz and is in the range of 2 kHz arranged.
  • FIG. 4a shows integrals of sensors 3 for bandpass filtering of 1850 Hz and 2350 Hz with subsequent absolute value formation.
  • the solid lines correspond to the load cases and the dashed lines correspond to NON-Fire load cases.
  • Each line corresponds to a defined frontal crash scenario.
  • Such a narrow frequency band corresponds to the requirements of a high safety factor for the entire chronological crash course relevant for triggering the accident prevention device 2. It can be seen a clear separation of the signals of Fire load cases and NON-Fire load cases in the entire time range from about 10 ms.
  • FIG. 4a shows integrals of sensors 3 for bandpass filtering of 1850 Hz and 2350 Hz with subsequent absolute value formation.
  • the solid lines correspond to the load cases and the dashed lines correspond to NON-Fire load cases.
  • Each line corresponds to a defined frontal crash scenario.
  • the fire load cases and NON-fire load cases overlap for the high-pass filtering of greater than 5 kHz given in DE 100 15 273 A1 in the case of the early ignition times.
  • the structure-borne sound can thus be evaluated preferably in a narrow frequency band, the optimum selection depending on the specific vehicle type.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Air Bags (AREA)

Abstract

La présente invention concerne un procédé de commande destiné à un dispositif de protection contre les accidents (2) dans un véhicule. Selon l'invention, des signaux sont détectés sur une plage de fréquence importante avec au moins un capteur (3) sensible aux vibrations, les signaux de sortie qui se trouvent sur la plage des fréquences de bruit de structure, et les signaux de sortie basse fréquence du capteur (3) sont évalués au moyen d'un circuit d'évaluation (7), et une activation du dispositif de protection contre les accidents (2) s'effectue en fonction de l'évaluation des signaux de sortie par un appareil de commande. Selon l'invention, les signaux de sortie des capteurs (3) sont évalués sur une plage de fréquences comprises entre 400 Hz et 5 kHz.
PCT/EP2006/005075 2005-06-06 2006-05-26 Procede de commande pour dispositif de protection contre les accidents dans un vehicule Ceased WO2006131224A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005026188A DE102005026188A1 (de) 2005-06-06 2005-06-06 Steuerverfahren für eine Unfallschutzeinrichtung in einem Fahrzeug
DE102005026188.4 2005-06-06

Publications (1)

Publication Number Publication Date
WO2006131224A1 true WO2006131224A1 (fr) 2006-12-14

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PCT/EP2006/005075 Ceased WO2006131224A1 (fr) 2005-06-06 2006-05-26 Procede de commande pour dispositif de protection contre les accidents dans un vehicule

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DE (1) DE102005026188A1 (fr)
WO (1) WO2006131224A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1979201B1 (fr) * 2006-01-16 2018-10-24 Continental Teves AG & Co. OHG Dispositif de prétraitement de signaux doté de filtres passe-bande pour capteurs de bruits de structure

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007024195B4 (de) * 2007-05-24 2016-12-29 Robert Bosch Gmbh Verfahren und Steuergerät zur Ansteuerung von Personenschutzmitteln
DE102007033639A1 (de) * 2007-07-19 2009-01-22 Conti Temic Microelectronic Gmbh Steuersystem und Verfahren zur Steuerung von zumindest einer Komponente eines Insassenschutzsystems eines Kraftfahrzeugs
DE102007046982B3 (de) * 2007-10-01 2009-03-05 Fendt, Günter Einrichtung zur Erfassung einer Unfallsituation und Verfahren zum Erkennen einer Unfallsituation und/oder zum Steuern eines Personschutzsystems
DE102009037619A1 (de) * 2009-08-14 2011-02-17 Continental Automotive Gmbh Verfahren zur Signalverarbeitung von Körperschallsignalen, insbesondere in Kraftfahrzeugen, sowie Insassenschutzsystem mit entsprechender Signalverarbeitungseinheit
DE102009046179A1 (de) 2009-10-29 2011-05-05 Scambia Industrial Developments Aktiengesellschaft Anhängekupplung
DE102010028845A1 (de) * 2010-05-11 2011-11-17 Robert Bosch Gmbh Verfahren und Vorrichtung zur Aufpralldetektion in Fahrzeugen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6157880A (en) * 1996-03-14 2000-12-05 Autoliv Developement Ab Crash detector responsive to a side impact
DE10015273A1 (de) 2000-03-28 2001-10-11 Siemens Ag Steuervorrichtung für eine Unfallschutzeinrichtung in einem Fahrzeug
DE10227061A1 (de) 2002-06-18 2004-01-08 Robert Bosch Gmbh Rückhaltesystem
DE102004015474A1 (de) * 2004-03-26 2004-12-23 Conti Temic Microelectronic Gmbh Aufnehmersystem/Auslösesensor, geeignet für Diagnose-/Sicherheitsvorrichtung, insbesondere für Unfallschutzeinrichtungen in einem Fahrzeug

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6157880A (en) * 1996-03-14 2000-12-05 Autoliv Developement Ab Crash detector responsive to a side impact
DE10015273A1 (de) 2000-03-28 2001-10-11 Siemens Ag Steuervorrichtung für eine Unfallschutzeinrichtung in einem Fahrzeug
DE10227061A1 (de) 2002-06-18 2004-01-08 Robert Bosch Gmbh Rückhaltesystem
DE102004015474A1 (de) * 2004-03-26 2004-12-23 Conti Temic Microelectronic Gmbh Aufnehmersystem/Auslösesensor, geeignet für Diagnose-/Sicherheitsvorrichtung, insbesondere für Unfallschutzeinrichtungen in einem Fahrzeug

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1979201B1 (fr) * 2006-01-16 2018-10-24 Continental Teves AG & Co. OHG Dispositif de prétraitement de signaux doté de filtres passe-bande pour capteurs de bruits de structure

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