WO2001004647A1 - Procede de verification d'une connexion electrique entre une partie metallique de boitier d'une charge et un potentiel de masse - Google Patents

Procede de verification d'une connexion electrique entre une partie metallique de boitier d'une charge et un potentiel de masse Download PDF

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Publication number
WO2001004647A1
WO2001004647A1 PCT/EP2000/006209 EP0006209W WO0104647A1 WO 2001004647 A1 WO2001004647 A1 WO 2001004647A1 EP 0006209 W EP0006209 W EP 0006209W WO 0104647 A1 WO0104647 A1 WO 0104647A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
load element
housing part
connection
metallic housing
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/EP2000/006209
Other languages
German (de)
English (en)
Inventor
Walter Mayer
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
Priority to EP00952994A priority Critical patent/EP1112501A1/fr
Publication of WO2001004647A1 publication Critical patent/WO2001004647A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B60R21/017—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including arrangements for providing electric power to safety arrangements or their actuating means, e.g. to pyrotechnic fuses or electro-mechanic valves
    • B60R21/0173—Diagnostic or recording means therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source

Definitions

  • the invention relates to a method for testing an electrical connection of a metallic housing part of a load element with a ground potential.
  • the load element is operated by a control unit with at least one line with a DC operating voltage
  • the load current that is used requires a completely different conductivity of the electrical connection compared to a possibly flowing quiescent current, so that this must be checked
  • DE-OS 2222038 shows a method for checking a scale of an occupant protection device, in which a scale current is applied to the scale by means of a test current source and the voltage drop that arises is compared with a reference value. Ultimately, the ohmic resistance of the scale is recorded , whereby the scale is usually very low and therefore with a relatively small and by no means for drawing a significant voltage drop is achieved in the test current carrying the tinder. In particular, an interruption of the tinder or the electrical connection to it can be detected with certainty
  • DE 195 30 238 A1 also shows a method for checking an occupant protection device, in which, due to inaccuracies in the test current source, the measurement of the resistance of the scale is previously calibrated by means of a measurement of a reference resistance
  • the resistance of the electrical connection proves to be not negligible
  • metallic housing parts of the occupant protection devices are increasingly connected to an electrical connection to a ground potential of an electrical system in order to prevent electromagnetic and electrostatic influences on the vehicle
  • DE 1 98 36 672 A1 also shows a circuit arrangement for checking an ignition pill of an occupant protection device connected to a trigger unit as a control unit via two lines, in which a parallel connection of a diode to the ignition pill through two oppositely polarized measuring voltages or currents determines the flow of the line - or connection resistance eliminated and the portion of the resistance actually attributable to the squib can be recorded
  • the object of the invention is to present a suitable method for testing an electrical connection of a metallic housing part of a load element with a ground potential
  • a diode is connected between at least one of the lines and the metallic housing part in the reverse direction to the DC operating voltage and by means of a Measurement voltage with opposite polarity to the DC supply voltage produces a test current flowing via the diode and the connection to ground potential
  • Such a method can also be used when the load element is connected to a first connection via exactly one connecting line and is permanently connected to a ground potential with a second connection via the metallic housing part.
  • Such one-wire connections of load elements are very cost-effective However, it proves to be advantageous to take the resistance of this connection, in particular the ground potential connection, into account in a functional test, as already explained at the beginning
  • Figure 1 circuit arrangement for a method for checking an electrical connection of a metallic housing part of a load element, in particular an occupant protection device with a ground potential
  • FIG. 2 circuit arrangement for a load element with only one line and a permanent ground connection via a metallic housing part
  • FIG. 1 shows a circuit arrangement for checking an electrical connection 50 of a metallic housing part 6 of a load element 1, in this example an occupant protection device in a motor vehicle, with a ground potential J, for example a motor vehicle electrical system.
  • the load element is connected via two lines 51, 5 2 connected to a control unit 2, in this example a trigger unit for occupant protection devices.
  • the load element is operated by means of a DC operating voltage.
  • a current flow 10 can be caused by a measuring voltage UM which has the opposite polarity to the DC operating voltage Uz via the connection 5 0, the body 8, the metallic housing part 6 and the
  • Diode D are generated, the value of which allows a statement to be made about the presence and the goodness of the connection.
  • the additional circuitry complexity for carrying out the method is therefore negligibly low. Measurement voltage generation and current measurement are often already available for other test purposes, for example for functional testing of the switching means 3 and 4, and often customizable for this task
  • the ground connection testable in this way from the control unit 2 is of particular importance for protection against electrostatic charges, since without a ground connection on the metallic housing part ⁇ a non-negligible electrical voltage is often built up by friction or the like, which may otherwise occur via the scale 1 discharges and thereby triggers conducted impulses due to switching operations are derived via this now testable ground connection.
  • the test can be used to warn the driver in good time and to initiate a repair
  • FIG. 2 now shows the use of the method for functional testing of the electrical connection of a load element 1, for example again a scale of an occupant protection device, with only a separate line 5 3, but instead a ground connection 5 0 through which the DC operating voltage Uz also flows, via a metallic housing part 6 and the body 8
  • the scale 1 provided here as the load element is therefore with a first connection
  • connection 7 1 via exactly one ignition line 5 3 and at least one switchable switching means 3 can be connected to the DC ignition voltage Uz.
  • a second connection 7 2 it is permanently connected to a metallic housing part 6 of the occupant protection device connected, which has a connection 50 through the vehicle body 8 to a ground potential J_.
  • a diode D is connected in the blocking direction to the DC voltage Uz between the now only line 53 and the metallic housing part 6, in this case parallel to the load element and thus in this exemplary embodiment parallel to the internal resistance Rl of
  • Tinder 1 instead of the tinder 1, any other load elements with a DC voltage operation are of course conceivable
  • a current 11 is generated by the diode D by means of a measuring voltage UM1 which is polarized opposite to the direct DC voltage Uz, provided that the internal resistance R1 of the load element 1, here the scale, is high-resistance to that
  • the internal resistance R1 of the scale 1 is so high that a short circuit of the scale line 5 3 to an electrical system voltage potential, for example a battery voltage of approximately 12 volts, cannot lead to a draw. R1 can then be neglected for the measurement of the otherwise is measured by means of a second measuring voltage UM2, now in the direction of the
  • a measuring voltage which is in turn polarized opposite to the operating voltage Uz, but measured below the forward voltage of the diode (D), can also be used to eliminate the parallel resistance of the load element 1

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

Procédé de vérification d'une connexion électrique entre une partie métallique de boîtier d'une charge et un potentiel de masse, la charge étant actionnée par une unité de commande par l'intermédiaire d'au moins une ligne conduisant une tension continue de fonctionnement. Selon ledit procédé, une diode est montée entre au moins une des lignes et la partie métallique de boîtier, dans le sens de blocage de la tension continue de fonctionnement, et un courant de vérification qui passe par la diode et par la connexion à vérifier avec le potentiel de masse est produit par une tension de mesure de polarité contraire à celle de la tension continue de fonctionnement. Ledit procédé peut aussi être appliqué à des charges à une seule ligne et une seule connexion à la masse qui conduit également le courant de charge, la diode étant dans ce cas couplée parallèle à la charge entre la ligne et la partie de boîtier. L'une des applications préférée concerne le domaine des dispositifs de protection des occupants d'un véhicule, en particulier pour un circuit de courant d'allumage couplé au potentiel de masse par l'intermédiaire de la carrosserie du véhicule.
PCT/EP2000/006209 1999-07-10 2000-07-04 Procede de verification d'une connexion electrique entre une partie metallique de boitier d'une charge et un potentiel de masse Ceased WO2001004647A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00952994A EP1112501A1 (fr) 1999-07-10 2000-07-04 Procede de verification d'une connexion electrique entre une partie metallique de boitier d'une charge et un potentiel de masse

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19932250.3 1999-07-10
DE1999132250 DE19932250A1 (de) 1999-07-10 1999-07-10 Verfahren zur Messung des ohmschen Widerstands einer elektrischen Verbindung und eines über diese elektrische Verbindung angeschlossenen Zünders einer Insassenschutzeinrichtung sowie einer Verbindung eines metallischen Gehäuseteils mit einem Massepotential

Publications (1)

Publication Number Publication Date
WO2001004647A1 true WO2001004647A1 (fr) 2001-01-18

Family

ID=7914305

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/006209 Ceased WO2001004647A1 (fr) 1999-07-10 2000-07-04 Procede de verification d'une connexion electrique entre une partie metallique de boitier d'une charge et un potentiel de masse

Country Status (3)

Country Link
EP (1) EP1112501A1 (fr)
DE (1) DE19932250A1 (fr)
WO (1) WO2001004647A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10139636C1 (de) * 2001-08-11 2003-04-10 Preh Elektro Feinmechanik Meßeinrichtung
DE102016218411A1 (de) * 2016-09-26 2018-03-29 Siemens Schweiz Ag Verfahren zur Überwachung einer leitungsredundant angeschlossenen Reihenschaltung von pyrotechnischen Auslösern bei einer Feuerlöschanlage sowie Löschsteuerzentrale

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5136275A (en) * 1991-01-28 1992-08-04 Adrian Madau Ground connection monitoring for airbag electrical igniter circuit
EP0590180A1 (fr) * 1992-09-29 1994-04-06 Siemens Aktiengesellschaft Dispositif de mesure pour tester les connexions de masse d'une commande, par exemple commande d'un système d'airbag d'un véhicule
DE4432301A1 (de) * 1994-09-10 1996-03-14 Bosch Gmbh Robert Elektronisches Steuergerät für Rückhaltesysteme

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0742878Y2 (ja) * 1989-04-14 1995-10-04 日本精工株式会社 乗員保護装置の故障検出装置
DE19530238B4 (de) * 1995-08-17 2004-04-08 Robert Bosch Gmbh Verfahren zur Überprüfung einer Sicherheitseinrichtung und Gerät zur Durchführung des Verfahrens
DE19731717C5 (de) * 1997-07-23 2004-06-24 Siemens Ag Schaltung zum Zünden von zwei Zündeinheiten, insbesondere Airbag-Zündeinheiten
DE19836672B4 (de) * 1998-08-13 2007-04-12 Bayerische Motoren Werke Ag Schaltanordnung zum Überprüfen einer Zündpille

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5136275A (en) * 1991-01-28 1992-08-04 Adrian Madau Ground connection monitoring for airbag electrical igniter circuit
EP0590180A1 (fr) * 1992-09-29 1994-04-06 Siemens Aktiengesellschaft Dispositif de mesure pour tester les connexions de masse d'une commande, par exemple commande d'un système d'airbag d'un véhicule
DE4432301A1 (de) * 1994-09-10 1996-03-14 Bosch Gmbh Robert Elektronisches Steuergerät für Rückhaltesysteme

Also Published As

Publication number Publication date
EP1112501A1 (fr) 2001-07-04
DE19932250A1 (de) 2001-01-25

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