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WO1988001241A1 - Element de commande et de controle de circuits d'allumage - Google Patents

Element de commande et de controle de circuits d'allumage Download PDF

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Publication number
WO1988001241A1
WO1988001241A1 PCT/DE1987/000317 DE8700317W WO8801241A1 WO 1988001241 A1 WO1988001241 A1 WO 1988001241A1 DE 8700317 W DE8700317 W DE 8700317W WO 8801241 A1 WO8801241 A1 WO 8801241A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
zkp
ignition
source
input
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/DE1987/000317
Other languages
German (de)
English (en)
Inventor
Bernhard Mattes
Wolfram Neth
Hartmut Schumacher
Hartmut Seiler
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO1988001241A1 publication Critical patent/WO1988001241A1/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
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/58—Testing
    • H01T13/60—Testing of electrical properties

Definitions

  • the invention relates to a circuit for actuating and monitoring n ignition circuits, where n is a number greater than or equal to 1, in safety devices, for example restraint systems such as belt tensioners or airbags in motor vehicles, in which an ignition pellet which can be actuated by an output stage is provided in the ignition circuit which can be loaded with a test current for continuity testing.
  • a circuit is known for example from DE-AS 24 54 424 and comprises a sensor circuit with a common reference voltage source for all components and a threshold switch which can be acted upon by a voltage which drops at an intact ignition element which is flowed through by a low test current becomes. This is intended to enable continuity testing. However, only a falling voltage can be detected, for example due to a break in the ignition element or an interruption in the supply lines. The occurrence of other errors, such as short circuits, cannot be determined in this way.
  • a monitoring circuit for one is from the "ATZ Automobiltechnische Zeitschrift", 84 (1982), page 77 ff Known sensor, when it is switched on, a test cycle is first run in which the entire signal path between the acceleration sensor and the igniter of the restraint systems (belt tensioner, airbag) is checked for continuity. During operation of this circuit, continuity tests of supply lines to the restraint systems are carried out continuously and the voltage supply is checked. Other faults cannot be determined with this circuit either.
  • a very similar circuit is also known from "Engineers de 1 'Automobile” (1982), No. 6, Paris, pages 69 to 77, for which the same restrictions therefore apply.
  • n bounce circuits (n greater than or equal to 1) in safety devices, for example restraint systems in motor vehicles, in which a squib which can be actuated by an output stage and which can be acted upon by a test current for continuity testing is provided in the ignition circuit, and in which A reference source is provided, from which a reference voltage and at least one reference current can be emitted, and in which each of the n ignition circuits each has an independent current source for testing the associated squib and a comparison circuit has the particular advantage that a large number of possible error influences can be recognized with high precision.
  • the measurement results in an ignition circuit in the circuit according to the invention are independent of short circuits or interruptions in adjacent ignition circuits. Due to the comparison circuit provided in each ignition circuit, measurements of the smallest difference Carry out voltage levels as they occur with the low-resistance squibs and the small permissible test currents. With the help of the switchable reference currents, a switchable current limitation is achieved, which leads to a reduction in the energy requirement, an increase in safety due to lower permanent current load on the squibs, and the possibility of achieving a hysteresis in the event of short-circuit detection. Another important advantage over the prior art is that the circuit according to the invention can also be used to determine the simultaneous occurrence of several errors.
  • a regulated switchable reference sink is also provided for loading a conductive output stage with higher test currents. This allows a functional check of the output stages and a simultaneous check of the squibs for a short circuit, and zw ar without the need for additional auxiliary transistors. In addition, the switching of a mechanical switch in the trip circuit can be precisely controlled, even when carrying high currents.
  • the accuracy that can be achieved with the circuit according to the invention is further increased if the reference source and / or the reference sink can be acted upon by a highly precise reference voltage. This also ensures very good tracking of the currents.
  • the current levels of the reference source and the current source can preferably be changed by switching interventions.
  • the comparison circuit assigned to each ignition circuit can be brought into a defined position by switching interventions, preferably by switchable current sources, the faulty ignition circuit can also be localized in addition to short-circuit detection. If you also assign a switchable to each comparison circuit Auxiliary current source too, this allows a hysteresis characteristic of the comparison circuits to be introduced.
  • a switchable current source is provided for each ignition circuit for controlling one output stage.
  • the output stages can then be tested with a low base current, which results in additional security against the occurrence of high collector currents in the output stage transistors.
  • a comparison circuit is provided to check a short circuit of the positive connection of each ignition circuit with respect to the supply voltage, at one input of which a voltage derived from the reference source and at the other input of which the positive connection is connected via a resistor, such a short circuit case can be precisely and with record low component expenditure.
  • a comparison circuit is provided for testing for conducting or blocking the output stages, at one input of which another voltage derived from the reference source and at the other input of which the emitter connection of the associated output stage transistor is connected via a Resistor is connected.
  • a comparison circuit is advantageously provided, on one input of which the positive voltage and on the other input of which a reference voltage is applied.
  • the detection and further evaluation of the accidents that have occurred can be accomplished in a variety of ways. This becomes particularly simple if an evaluation circuit is provided to control the ignition circuits and to analyze, in particular, the time behavior of the signals received. Further differences can be win between proper functioning and the occurrence of certain accidents.
  • the evaluation circuit is preferably a microprocessor which can be adapted particularly easily to different operating conditions.
  • the exemplary embodiment is a circuit for actuating and monitoring n ignition circuits (n greater than or equal to 1) in safety devices, for example restraint systems in motor vehicles, in which an ignition pellet which can be actuated by an output stage is provided in the ignition circuit and is used for continuity testing with a test current is acted upon.
  • a safety device can be, for example, a belt tensioner and / or an airbag.
  • connection terminals On the left edge of the test circuit, numerous connection terminals are shown, some of which are intended for the application of signals to the test circuit, and some of which are intended for the output of signals.
  • US designates a connection for a stabilized voltage, typically 5 V with a fluctuation of 5%.
  • V is the general supply voltage and is in the range between 7 to 20 V.
  • ST1 is a terminal at which a logic signal with a low level (LOW) is present when the reference source is shorted to the supply voltage V.
  • Further result output terminals, at which logic signals with level LOW are present in certain malfunctions are designated ST2, ST3, ST4 and are explained in more detail below.
  • control terminals P1, ..., Pn are provided to initiate a check for ignition circuit resistances which are too small, PZE to prevent activation and a connection terminal A for an ignition trigger signal.
  • Further result output connections for reporting squib resistances are provided at the upper edge of the test circuit and designated ZW1, ..., ZWn.
  • connection terminals ZKP for the positive connection of the ignition circuits
  • one connection each ZKM1, ..., ZKMn for the Negative connections of the ignition circuits and connections ZKA1, ..., ZKAn are provided for each output stage T1, ..., Tn of the ignition circuits.
  • a connector MSA is used to connect to a mechanical switch MS.
  • connection terminals shown at the top and left edge are connected to a microprocessor (not shown) which, depending on the type of the respective connection terminal, can emit a signal to or receive from this.
  • An input of a reference source ZKP source which is also designated, is connected to the connection US, which has a further connection UR for applying a reference voltage UR.
  • This reference voltage is highly precise, in particular temperature-compensated, and has a value of typically 3.6 V with a fluctuation of no more than 1%.
  • Another connection S1 of the ZKP source is a switching connection which initiates the switching of different current levels which can be output by the ZKP source.
  • Another current level I3 of typically 4 mA is used for the internal operating point setting of the ZKP source.
  • the terminal ST1 is connected to the output of a comparator K1, at one input (+) of which there is the voltage U2 and at the other input (-) of which there is a resistor RS, the other connection of which is connected to the output I of the ZKP source.
  • the input (-) of the comparator K1 is further connected to an input (+) of a further comparator K2, at the other input (-) of which the voltage U6 is applied.
  • the output of the comparator K2 is connected to an input of a logic AND gate A1, whose output leads to terminal ST2.
  • the other input of the AND gate AI is connected to the output of a further comparator K3, to the one input (+) of which the voltage U2 and to the other input (-) of which an input (+) of a further comparator K4 is connected.
  • the voltage U3 is at the second input of the comparator K4, the output of K4 is led to the terminal ST3.
  • the input (+) of the comparator K4 is connected to an input (-) of a further comparator K5, at whose other input (+) the voltage U4 is applied and the output of which is connected to the terminal ST4.
  • the terminals P1, ..., Pn are each connected to an inverter II, ..., In, which is in turn connected to an input of a logical AND gate AND1, ..., ANDn, the other input of which is connected to the output another AND gate A4 is guided, one input of which is connected to the terminal PZE.
  • the other input of A4 leads to the output of an AND gate A3, one input of which is at the terminal ST1 and the other of which is at the switching terminal S1 of the ZKP source.
  • the outputs of the AND gates AND1, ..., ANDn are each connected to switches STA1, ..., STAn for their actuation.
  • the terminal A for the ignition trigger signal is led via an inverter 10 to an input of an AND gate A2, the other input of which is connected to the terminal PZE.
  • the output of the AND gate A2 is for its actuation connected to a switch SA.
  • a mechanical switch MS is shown, which is connected between ground and the connection MSA.
  • the connection MSA is also connected to the emitters of all output stage transistors T1, ..., Tn, the bases of which are each connected to a connection ZKA1, ..., ZKAn and the collector of which is connected to a connection ZKM1, ..., ZKMn and to a connection a squib ZP1, ..., ZPn is connected.
  • the respective second connections of the squib ZP1, ..., ZPn are connected to each other and connected to the connection ZKP ("ignition circuit plus"), to which a resistor R of typically 30 ohms is connected, the other connection to a current source IR (typically 1 mA) leads.
  • a test switch and an energy reserve is connected to the terminal ZKP, namely the emitter of a transistor PS is connected to ZKP, the base of PS leads to a test switch connection PSA and the collector of the transistor PS to the cathode of a diode D1, the anode of which the positive connection of an energy reserve ER, for example a capacitor bank, is connected.
  • an energy reserve ER for example a capacitor bank
  • a separate current source IZKA1, ..., IZKAn is provided for each ignition circuit, each connected via the associated connection ZKA1, ..., ZKAn. These current sources are each switched via the associated switch STA1, ..., STAn. Furthermore, a separate current source IZK1, ..., IZKn is provided for each squib ZP1, ..., ZPn, each connected via the (negative) terminals ZKM1, .... ZKMn, which is switched via switch SB, which are in turn connected to the output of the comparator K2 for actuation. The terminals ZW1, ..., ZWn are each connected to the outputs of comparators ZKK1, ..., ZKKn. An input (+) of the comparators ZKK1, ..., ZKKn is connected to a protective resistor RS1.1, ..., RS1.n and to a localization current source IL1, ..., ILn.
  • the respective other input (-) of the comparators ZKK1, ..., ZKKn is connected to a resistor RT1 and to a resistor RT2.
  • the resistor RT2 is connected via a diode D to the terminal ST1 and to an input of the AND gate A3.
  • the other connection of the resistor RT1 is connected to the resistor R and the current source IR.
  • Auxiliary current sources IH1, ..., IHn are also connected to the resistors RS1.1, ..., RSl.n and are switched via switches SW1, ..., SWn.
  • Protective resistors RS2.1, ..., RS2.n are also connected to the connection points between the resistors RS1.1, ..., RSl.n and the auxiliary current sources IH1, ..., IHn, the other connection of which is connected to an associated one Terminal ZKM1, ..., ZKMn is connected.
  • MSA sink The input of a reference sink (MSA sink) is connected to the MSA terminal.
  • Another current level I6 of 1 mA is used for the internal operating point setting of the MSA sink.
  • UR 3.6 V (plus / minus 1%)
  • Resistance monitoring for excessively large ignition circuit resistances if one or more squib resistors R ZP1. .n larger than R'IR / I ZK1. .n , i.e. greater than about 7.5 ohms, the associated monitoring comparators ZKK1, ..., ZKKn respond and their associated outputs ZW1, ..., ZWn become LOW.
  • the microprocessor identifies the associated ignition circuit or circuits.
  • the test drive current IZKA1 is 0.6 mA
  • the current I ZP1 is: IZK1 + I4 I6 - IZKA1; IZK1 is absorbed by ZKM1 and 14 by the MSA sink.
  • I ZP1 20 mA. Only if the resistor R ZP1. .n is less than R'IR / I ZP1.
  • the microprocessor controls this for each ignition circuit.
  • Check for the control of the output stages T1, ..., Tn: this check is carried out dynamically with the check just described above. As a result of a conductive output stage, the voltage U at MSA becomes greater than U4 1.8 V. Therefore, the comparator K5 tilts, the signal ST4 becomes LOW, specifically for the intended control duration of A1, ..., An.
  • the microprocessor monitors compliance with this time condition.
  • the microprocessor detects a short to ZKP after mass.
  • the microprocessor detects a short-circuit to ground at ZKM1, ..., ZKMn, taking into account a predeterminable suitable time condition.
  • the switch is triggered, the time at which the switch is closed is recorded; a voltage drop at the switch contact with a high current of U M SA less than U3 does not interfere.
  • R ZP1. .n (below) IRR / (IZK1..n + 14 - 16 - IZKA1..n)

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Bags (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

Dans un élément de commande et de contrôle de n circuits (n étant supérieur ou égal à 1) de dispositifs de sécurité, par exemple des systèmes de retenue dans des véhicules à moteur, le circuit d'allumage est pourvu d'une amorce (ZPn) susceptible d'être actionnée par un étage final et de recevoir un courant de côntrole lors d'un contrôle de continuité. Chaque circuit d'allumage n est relié à une source indépendante de courant (IZKn) de contrôle de l'amorce correspondante et à un circuit de référence (ZKKn). Des tensions initiales et de référence, ainsi que des courants commutables de référence et de commande, peuvent être dérivés d'une tension centrale de référence (ZKP). Une porte-ZKP avec une source ZKP réglable et une porte MSA avec une source MSA réglable dont les paramètres sont dérivés de la tension centrale de référence permettent de reconnaître des défaillanes avec précision.
PCT/DE1987/000317 1986-08-12 1987-07-15 Element de commande et de controle de circuits d'allumage Ceased WO1988001241A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863627239 DE3627239A1 (de) 1986-08-12 1986-08-12 Schaltung zur ansteuerung und ueberwachung von zuendkreisen
DEP3627239.6 1986-08-12

Publications (1)

Publication Number Publication Date
WO1988001241A1 true WO1988001241A1 (fr) 1988-02-25

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ID=6307178

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Application Number Title Priority Date Filing Date
PCT/DE1987/000317 Ceased WO1988001241A1 (fr) 1986-08-12 1987-07-15 Element de commande et de controle de circuits d'allumage

Country Status (3)

Country Link
DE (1) DE3627239A1 (fr)
ES (1) ES2008167A6 (fr)
WO (1) WO1988001241A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989009147A1 (fr) * 1988-03-22 1989-10-05 Robert Bosch Gmbh Dispositif electronique
WO1990002674A1 (fr) * 1988-09-14 1990-03-22 Robert Bosch Gmbh Systeme de coussins pneumatiques de securite servant a la protection des occupants d'un vehicule a moteur
EP0343578A3 (en) * 1988-05-23 1990-11-07 Nippondenso Co., Ltd. Releasing circuit for actuating vehicular safety device
EP0338413A3 (fr) * 1988-04-22 1991-02-06 Trw Inc. Méthode et dispositif pour le contrôle d'un système de retenue à airbag
EP0453255A1 (fr) * 1990-04-18 1991-10-23 Nippondenso Co., Ltd. Dispositif de coussin d'air pour véhicule
EP0641688A1 (fr) * 1993-09-08 1995-03-08 Delco Electronics Corporation Circuit de diagnostic pour un système de retenue gonflable
EP0701928A1 (fr) * 1994-09-19 1996-03-20 Ford Motor Company Essai d'une résistance pour capsule détonante pour coussin d'air
WO1997014045A3 (fr) * 1995-10-10 1997-05-29 Bosch Gmbh Robert Dispositif electronique

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19524615A1 (de) * 1995-07-06 1997-01-09 Telefunken Microelectron Verfahren und System zum Erkennen von Isolationsfehlern
DE10109637B4 (de) * 2001-03-01 2009-04-30 Conti Temic Microelectronic Gmbh Verfahren zum Betrieb einer Insassensicherheitseinrichtung
DE102007044345A1 (de) 2007-09-17 2009-03-19 Robert Bosch Gmbh Schaltung und Verfahren zum Prüfen von elektrisch steuerbaren Leistungsschaltern für ein Ansteuern von Personenschutzmitteln

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3633159A (en) * 1970-11-10 1972-01-04 Gen Motors Corp Vehicle air cushion actuation and monitoring circuit
FR2217187A1 (fr) * 1973-02-14 1974-09-06 Eaton Corp
DE2808872A1 (de) * 1978-03-02 1979-09-13 Messerschmitt Boelkow Blohm Ausloeseschaltung fuer eine sicherheitseinrichtung, vorzugsweise in kraftfahrzeugen, mit einer pruefschaltung
EP0011680A1 (fr) * 1978-11-28 1980-06-11 Robert Bosch Gmbh Circuit de contrôle pour le système déclencheur d'une installation de sécurité servant à la protection des occupants d'un véhicule lors d'un accident
DE3001780A1 (de) * 1980-01-18 1981-07-23 Becker Autoradiowerk Gmbh, 7516 Karlsbad Steueranordnung fuer sicherheitseinrichtungen in fahrzeugen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2614491C3 (de) * 1976-04-03 1980-07-10 Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen Schaltungsanordnung zum Überwachen der Funktionsbereitschaft der Auslöseorgane einer Sicherheitseinrichtung für Fahrzeuge
DE3116867A1 (de) * 1981-04-28 1982-11-11 Bayerische Motoren Werke AG, 8000 München Schaltungsanordnung zum ausloesen von notschaltfunktionen bei kraftfahrzeugen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3633159A (en) * 1970-11-10 1972-01-04 Gen Motors Corp Vehicle air cushion actuation and monitoring circuit
FR2217187A1 (fr) * 1973-02-14 1974-09-06 Eaton Corp
DE2808872A1 (de) * 1978-03-02 1979-09-13 Messerschmitt Boelkow Blohm Ausloeseschaltung fuer eine sicherheitseinrichtung, vorzugsweise in kraftfahrzeugen, mit einer pruefschaltung
EP0011680A1 (fr) * 1978-11-28 1980-06-11 Robert Bosch Gmbh Circuit de contrôle pour le système déclencheur d'une installation de sécurité servant à la protection des occupants d'un véhicule lors d'un accident
DE3001780A1 (de) * 1980-01-18 1981-07-23 Becker Autoradiowerk Gmbh, 7516 Karlsbad Steueranordnung fuer sicherheitseinrichtungen in fahrzeugen

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989009147A1 (fr) * 1988-03-22 1989-10-05 Robert Bosch Gmbh Dispositif electronique
EP0338413A3 (fr) * 1988-04-22 1991-02-06 Trw Inc. Méthode et dispositif pour le contrôle d'un système de retenue à airbag
EP0343578A3 (en) * 1988-05-23 1990-11-07 Nippondenso Co., Ltd. Releasing circuit for actuating vehicular safety device
WO1990002674A1 (fr) * 1988-09-14 1990-03-22 Robert Bosch Gmbh Systeme de coussins pneumatiques de securite servant a la protection des occupants d'un vehicule a moteur
US5204547A (en) * 1988-09-14 1993-04-20 Robert Bosch Gmbh Air bag system for protection of the occupants of motor vehicles
EP0453255A1 (fr) * 1990-04-18 1991-10-23 Nippondenso Co., Ltd. Dispositif de coussin d'air pour véhicule
US5135254A (en) * 1990-04-18 1992-08-04 Nippondenso Co., Ltd. Vehicle air bag apparatus
EP0641688A1 (fr) * 1993-09-08 1995-03-08 Delco Electronics Corporation Circuit de diagnostic pour un système de retenue gonflable
EP0701928A1 (fr) * 1994-09-19 1996-03-20 Ford Motor Company Essai d'une résistance pour capsule détonante pour coussin d'air
WO1997014045A3 (fr) * 1995-10-10 1997-05-29 Bosch Gmbh Robert Dispositif electronique

Also Published As

Publication number Publication date
DE3627239A1 (de) 1988-02-18
ES2008167A6 (es) 1989-07-16

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