Verfahren zur Aktivierung einer Endstufe für Sicherheitseinrichtungen eines Kraftfahrzeuges

Procédé pour l'activation d'un étage amplificateur de sortie d'un dispositif de sécurité pour véhicule

Method of activating the amplifier output stage of a safety device for vehicles

Abstract

The activation system is used for an end stage with a pair of power transistors (T1, T2) controlling an electrically operated release device (Z), e.g. an air-bag detonator, respectively coupled to an operating potential and a reference potential via the transistors. Each transistor has an associated current detector (S1, S2) and is supplied with a respective control signal (Ust1, Ust2). The control signals have different durations with a partial overlap between them and are used for successive closure of the transistors, so that the current flow is indicated by the respective current detectors, the signal indicating the current flow through one transistor used to maintain the current flow through the second transistor, during the non-overlap duration of the control signals. <IMAGE>
Zunehmend werden Kraftfahrzeuge mit Sicherheitseinrichtungen für Fahrzeuginsassen ausgestattet, wobei diese Sicherheitseinrichtungen elektrisch betätigbare Auslösemittel, beispielsweise Zündpillen für Airbags, enthalten, die ihrerseits über eine Endstufe gesteuert werden. Die Erfindung zeigt ein Verfahren, das einen sicheren und störungsfreien Betrieb dieser Auslösemittel gewährleistet und die Endstufe im Fehlerfall, beispielsweise bei einem Nebenschluß der Zündpille, vor einer Zerstörung schützt.

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NO-Patent Citations (0)

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    GB-2319870-AJune 03, 1998Autoliv Dev, Sagem AutolivAn electronic control circuit for a vehicle safety device
    GB-2319870-BMay 17, 2000Autoliv Dev, Sagem Autoliv, Autoliv Electronics SasImprovements in or relating to an electronic control circuit for a vehicle safety device
    US-6448784-B1September 10, 2002Siemens AktiengesellschaftConfiguration and method for testing a circuit apparatus provided for controlling an occupant protection device of a motor vehicle
    US-9176179-B2November 03, 2015Freescale Semiconductor, Inc.Method and device for diagnosing a reservoir capacitor of a vehicle passenger protection system, and vehicle safety system incorporating such device
    US-9561767-B2February 07, 2017Autoliv Development AbDrive arrangement for driving a vehicle safety device
    WO-2006003095-A1January 12, 2006Siemens AktiengesellschaftAnordnung zum steuern eines personenschutzmittels eines kraftfahrzeugs
    WO-2014029952-A1February 27, 2014Autoliv Development Ab, Seasidetech Sas, Beattie, AlexA drive arrangement for driving a vehicle safety device
    WO-9906245-A2February 11, 1999Siemens AktiengesellschaftDispositif et procede pour essayer un montage servant a commander un moyen de protection d'occupant d'un vehicule automobile
    WO-9906245-A3April 08, 1999Siemens Ag, Horst Belau, Christian ZelgerSystem and method for testing a circuit device for controlling an automobile passenger protection mechanism