WO1989006366A1 - Procede et dispositif pour controler la capacite d'un condensateur - Google Patents

Procede et dispositif pour controler la capacite d'un condensateur Download PDF

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Publication number
WO1989006366A1
WO1989006366A1 PCT/DE1988/000643 DE8800643W WO8906366A1 WO 1989006366 A1 WO1989006366 A1 WO 1989006366A1 DE 8800643 W DE8800643 W DE 8800643W WO 8906366 A1 WO8906366 A1 WO 8906366A1
Authority
WO
WIPO (PCT)
Prior art keywords
discharge
voltage
capacitance
capacity
capacitor
Prior art date
Application number
PCT/DE1988/000643
Other languages
German (de)
English (en)
Inventor
Werner Nitschke
Wolfgang Drobny
Hugo Weller
Peter Taufer
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 WO1989006366A1 publication Critical patent/WO1989006366A1/fr

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Classifications

    • 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
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • 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
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
    • 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
    • G01R31/64—Testing of capacitors

Definitions

  • the circuit arrangement comprises an energy reserve, usually in the form of an electrolytic capacitor that can be charged by the vehicle battery. Since high-quality electrolytic capacitors are also subject to aging processes and / or their capacitance values change as a function of the ambient temperature, the electrolytic capacitors must be checked regularly in order to be able to guarantee a safe functioning of the circuit arrangement.
  • a test circuit for the triggering device of a safety device serving to protect the occupants of a vehicle during an accident in which a constant current source is provided for continuously checking the functionality of an ignition element provided in the triggering device, from which a constant current source is provided low current flows through the ignition element.
  • the one on the Zündele The voltage drop is compared with the voltage of a constant current source.
  • the solution according to the invention with the characterizing features of claim 1 has the advantage that the operational safety of a safety device can be significantly increased, since the capacity of the capacitors provided as an energy reserve can be checked continuously.
  • means for limiting the voltage at the energy reserve are specified.
  • FIG. 1 shows the voltage profile across the capacitor as a function of time
  • FIG. 2 shows a simplified circuit diagram of a device for carrying out the method according to the invention
  • FIG. 3 shows a block diagram of a device for carrying out the method
  • FIG. 4 shows a flow chart to explain the method according to the invention
  • FIG further design of a device with voltage limitation Description of the embodiment
  • a safety device 10 for vehicle occupants comprises an acceleration sensor 11, which converts an acceleration a into a voltage V. At the output of 11, therefore, either an acceleration-proportional signal is generated or a signal that only occurs when a definable acceleration threshold is exceeded.
  • This signal is fed to an evaluation circuit 12, in which the signal emitted by the sensor 11 is examined to determine whether an accident has occurred and the safety device must therefore be activated.
  • Restraining means 13 for the vehicle occupants such as, for example, airbag and / or belt tensioners, are connected to the evaluation circuit 12 and can be actuated thereby.
  • the device further comprises an energy reserve 14 which, in the event of an accident, ensures that the device 10 is still supplied with power even if, for example, the vehicle battery is torn off and is no longer connected to the vehicle electrical system.
  • Electrolyte capacitors are expediently used as the energy reserve 14 since, despite a relatively large capacitance value, they have a comparatively small construction volume and are also inexpensive to manufacture.
  • electrolytic capacitors are subject to aging processes, for example, which can adversely affect their capacitance value.
  • the capacity value can also be temperature-dependent. For the operational safety of the device 10, it is therefore extremely important to regularly check the capacity value of the energy reserve 14.
  • a suitable test circuit is represented in the block diagram according to FIG. 3 by the components 15, 16, 17 and 18, which will be explained in more detail below. First, however, the principle according to which the capacity of the energy reserve 14 is checked is explained using FIGS. 1 and 2.
  • Figure 1 shows a diagram of the course of the voltage U on
  • Energy reserve 14 (capacitor C40) as a function of time. It is assumed that at the beginning of the test process, that is to say at time t 1 , capacitor C40 is charged to voltage U s1 .
  • Voltage U on capacitor C40 is in accordance with the circuit arrangement in
  • Figure 2 determined by a voltage measuring device 21. The measured value is fed to a measuring circuit 15. Then the capacitor
  • C40 is discharged by a switching element S20 which can be actuated by the measuring circuit 15 via a discharge resistor R E with a constant current I K.
  • the discharge current can be monitored by a measuring device 22 and fed to the measuring circuit 15.
  • the duration of the unloading process is also recorded by a measuring device 23 and fed to the measuring circuit 15.
  • the discharge of the capacitor C40 with the constant current I continues until a predeterminable voltage level U s2 is reached, which varies by the voltage value ⁇ U E from
  • the current capacitance value of the capacitor C40 can thus be determined.
  • the unloading process ends at time t 2 . From this point in time, the capacitor C40 is recharged up to the voltage setpoint U s1 .
  • the measuring circuit 15 for measuring the voltage at the energy reserve 14 and the discharge time t E , an evaluation circuit 16 which evaluates the measured values detected by 15 and controls the test sequence, a control circuit 17 which, initiated by the evaluation circuit 16, via the discharge circuit 18 causes the energy reserve 14 to be discharged for the purposes of testing and the measured value acquisition via the measuring circuit 15.
  • step 100 the device is put into operation and in step 101 the energy reserve 14 or the capacitor C 40 are charged.
  • the test process begins in step 102, in which the control circuit 16 (FIG. 3) first initiates a measurement and storage (step 103) of the voltage value U s1 . Subsequently, a discharge of 14, C40 with constant current I K is initiated via the discharge circuit 18 (step 104). The discharge time t is measured (step 105). During the unloading process, the measuring circuit 15 continuously supplies the energy reserve 14
  • all of the test steps described above are controlled by a computer; the test process can be carried out once each time the device is started up, i.e. when the vehicle is started or cyclically with a predefinable time sequence. As soon as it is determined during the test process that the Kapa is below a critical limit value and the functionality of the device is no longer guaranteed in an emergency, this can be expediently indicated by a warning signal. Furthermore, when equipping a vehicle with a plurality of safety devices, a priority can be set in such a way that if the capacity value of the energy reserve 14 is too low, only the safety devices of particularly vulnerable vehicle occupants can be activated.
  • the circuit arrangement is to be designed as shown in FIG. 5.
  • a capacitor C40 to which a voltage divider R40, R41 is connected in parallel, serves as the energy reserve.
  • the tap of the voltage divider R40, R41 leads to the measuring circuit 15, which measures the voltage at C40.
  • the series circuit of the collector-emitter path of a first transistor T40 and a resistor R43 is connected in parallel with C40.
  • the base connection of transistor T40 is connected to the junction of a resistor R42 and a Zener diode Z40, which are part of a series circuit, which also includes the discharge resistor R E and the collector-emitter path of a second transistor T41.
  • the base terminal of the transistor T41 is connected to the discharge circuit 18 and is triggered by this discharge circuit 18 to initiate a discharge process for test purposes.
  • the connection point between the Zener diode Z40 and the discharge resistor R E is led via a diode D40 to the connection 2, to which a stabilized supply voltage for charging the capacitor C40 can be placed.
  • With uncontrolled unloading circuit 18 can the voltage U s at C40 to a maximum value of
  • U EB (T40) base-emitter voltage of the transistor T 40 ,
  • this circuit arrangement also ensures that the capacitor C40, which serves as an energy reserve, does not fall below a predeterminable minimum value if the discharge circuit is defective.
  • This minimum value U MIN is:
  • the discharge circuit described above is also suitable for limiting the maximum voltage across the capacitor C40 when the discharge circuit is not activated and for limiting it to a minimum voltage if the discharge circuit is defective. This means two additional weighty safety functions that can be achieved without significant additional circuitry.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Air Bags (AREA)

Abstract

Dans le procédé décrit, le condensateur (C40) est déchargé depuis une première valeur de la tension (US1) jusqu'à une autre valeur prédéterminée de la tension (US2) avec un courant de décharge constant (IK). La durée de la décharge (tE) est mesurée. Connaissant la résistance de charge (RE) et les valeurs mesurées, on peut calculer la capacité actuelle du condensateur (C40).
PCT/DE1988/000643 1987-12-30 1988-10-19 Procede et dispositif pour controler la capacite d'un condensateur WO1989006366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873744524 DE3744524A1 (de) 1987-12-30 1987-12-30 Verfahren und einrichtung zur ueberpruefung einer kapazitaet
DEP3744524.3 1987-12-30

Publications (1)

Publication Number Publication Date
WO1989006366A1 true WO1989006366A1 (fr) 1989-07-13

Family

ID=6343846

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1988/000643 WO1989006366A1 (fr) 1987-12-30 1988-10-19 Procede et dispositif pour controler la capacite d'un condensateur

Country Status (2)

Country Link
DE (2) DE8717831U1 (fr)
WO (1) WO1989006366A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0762713A1 (fr) * 1995-09-07 1997-03-12 Siemens Aktiengesellschaft Montage pour tester des lignes d'abonnés
FR2949864A1 (fr) * 2009-09-09 2011-03-11 Peugeot Citroen Automobiles Sa Procede de determination d'un etat de fonctionnement de moyens de stockage d'energie electrique constitues d'au moins un supercondensateur
EP2097287A4 (fr) * 2006-12-22 2018-03-28 Volvo Truck Corporation Procédé et dispositif pour décharger un système de stockage d'énergie pour une énergie électrique
WO2021129982A1 (fr) * 2019-12-23 2021-07-01 Robert Bosch Gmbh Procédé, programme informatique, support de stockage électronique et dispositif de détection de claquage d'une unité de réserve d'énergie

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01274628A (ja) * 1988-04-25 1989-11-02 Nippon Denso Co Ltd 乗員保護装置の異常判定装置
DE4116961A1 (de) * 1991-05-24 1992-11-26 Abb Patent Gmbh Messschaltung zur messung einer kapazitaet
DE19508850A1 (de) * 1995-03-11 1996-09-12 Telefunken Microelectron Schaltungsvorrichtung, insbesondere für sicherheitskritische Systeme in Fahrzeugen zur Personenbeförderung
DE19517698C2 (de) * 1995-05-13 1999-04-22 Telefunken Microelectron Verfahren zur Festlegung der Autarkiezeit eines sicherheitskritischen Systems in einem Fahrzeug zur Personenbeförderung nach dem Abschalten einer Versorgungsspannungsquelle
JP3301903B2 (ja) * 1995-10-30 2002-07-15 ボッシュ エレクトロニクス株式会社 車両用乗員保護装置におけるエネルギーリザーバ保護装置
DE10030389C2 (de) * 2000-06-21 2002-07-18 Siemens Ag Schaltungsanordnung zum Messen der Kapazität des Zündkondensators für ein Insassenschutzmittel
DE10255429A1 (de) * 2002-11-28 2004-06-09 Conti Temic Microelectronic Gmbh Verfahren zum Betreiben einer aus einer Betriebsspannungsquelle versorgten elektronischen Baugruppe
TW200624826A (en) 2004-10-29 2006-07-16 Koninkl Philips Electronics Nv System for diagnosing impedances having accurate current source and accurate voltage level-shift
DE102005058719A1 (de) * 2005-12-08 2007-06-14 Conti Temic Microelectronic Gmbh Schaltungsanordnung zur Überprüfung eines Energiespeichers, insbesondere eines Autarkiekondensators eines sicherheitskritischen Systems in einem Fahrzeug
DE102010031596B4 (de) 2010-07-21 2020-06-10 Robert Bosch Gmbh Steuergerät und Verfahren zur Ansteuerung von Personenschutzmitteln für ein Fahrzeug
WO2012143750A1 (fr) * 2011-04-22 2012-10-26 Freescale Semiconductor, Inc. Procédé et dispositif pour diagnostiquer un condensateur de réservoir d'un système de protection de passagers de véhicule, et système de sécurité de véhicule incorporant un tel dispositif
US9007087B2 (en) * 2012-10-11 2015-04-14 Hamilton Sundstrand Corporation System and method for automated failure detection of hold-up power storage devices
DE102017119734A1 (de) * 2017-08-29 2019-02-28 Elmos Semiconductor Aktiengesellschaft Verfahren und Vorrichtung zur Detektion eines Stützkapazitätsverlusts an einem integrierten Spannungsregler für die interne Versorgung einer integrierten sicherheitsrelevanten Schaltung

Citations (2)

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Publication number Priority date Publication date Assignee Title
US3581196A (en) * 1968-10-28 1971-05-25 William L Spaid Digital capacitance meter by measuring capacitor discharge time
DE1791234A1 (de) * 1967-07-25 1971-08-19 Dorsch Hans Heinz Dipl Ing Anordnung zur digitalen Messung von Kapazitaeten

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DE2426859A1 (de) * 1974-06-04 1976-01-02 Hans Klein Messchaltung zur messung von kapazitaeten und widerstaenden
DE3213867A1 (de) * 1980-12-18 1983-10-27 Siemens AG, 1000 Berlin und 8000 München Verfahren und schaltungsanordnung zur bestimmung der kapazitaet eines messobjekts

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
DE1791234A1 (de) * 1967-07-25 1971-08-19 Dorsch Hans Heinz Dipl Ing Anordnung zur digitalen Messung von Kapazitaeten
US3581196A (en) * 1968-10-28 1971-05-25 William L Spaid Digital capacitance meter by measuring capacitor discharge time

Non-Patent Citations (2)

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Title
Elektronik, Band 29, Nr. 21, Oktober 1980, W. Haussel: "Kapazit{tsmessung f}r Digitalmultimeter", Seiten 67-70 *
Radio Mentor Electronic, Band 37, Nr. 2, Februar 1971, P. Petrick: "Gleichspannungskapazit{t bei Tantal-Kondensatoren", Seiten 80-83 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0762713A1 (fr) * 1995-09-07 1997-03-12 Siemens Aktiengesellschaft Montage pour tester des lignes d'abonnés
EP2097287A4 (fr) * 2006-12-22 2018-03-28 Volvo Truck Corporation Procédé et dispositif pour décharger un système de stockage d'énergie pour une énergie électrique
FR2949864A1 (fr) * 2009-09-09 2011-03-11 Peugeot Citroen Automobiles Sa Procede de determination d'un etat de fonctionnement de moyens de stockage d'energie electrique constitues d'au moins un supercondensateur
WO2011030024A1 (fr) * 2009-09-09 2011-03-17 Peugeot Citroën Automobiles SA Procede de determination d'un etat de fonctionnement de moyens de stockage d'energie electrique constitues d'au moins un supercondensateur
WO2021129982A1 (fr) * 2019-12-23 2021-07-01 Robert Bosch Gmbh Procédé, programme informatique, support de stockage électronique et dispositif de détection de claquage d'une unité de réserve d'énergie
CN114846339A (zh) * 2019-12-23 2022-08-02 罗伯特·博世有限公司 用于识别备用电能设备损坏的方法、计算机程序、电子存储介质及装置

Also Published As

Publication number Publication date
DE3744524A1 (de) 1989-07-20
DE8717831U1 (de) 1990-06-28

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