DE4220904A1 - Testing mechanically operated switch in vehicle airbag passenger safety system - applying positive or negative voltage to end of test coil and checking for voltage change at other to sense fault caused by vibration in soldered connection on circuit board. - Google Patents

Testing mechanically operated switch in vehicle airbag passenger safety system - applying positive or negative voltage to end of test coil and checking for voltage change at other to sense fault caused by vibration in soldered connection on circuit board.

Info

Publication number
DE4220904A1
DE4220904A1 DE19924220904 DE4220904A DE4220904A1 DE 4220904 A1 DE4220904 A1 DE 4220904A1 DE 19924220904 DE19924220904 DE 19924220904 DE 4220904 A DE4220904 A DE 4220904A DE 4220904 A1 DE4220904 A1 DE 4220904A1
Authority
DE
Germany
Prior art keywords
vibration
circuit board
voltage
switch
mechanically operated
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.)
Withdrawn
Application number
DE19924220904
Other languages
German (de)
Inventor
Guenter Dipl Ing Fendt
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.)
Airbus Defence and Space GmbH
Original Assignee
Messerschmitt Bolkow Blohm 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 Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Priority to DE19924220904 priority Critical patent/DE4220904A1/en
Publication of DE4220904A1 publication Critical patent/DE4220904A1/en
Withdrawn legal-status Critical Current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
    • G01R31/005—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
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
    • G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches

Abstract

A method of testing for the presence and efficient connection of a mechanically operated switch employs a test coil in series with the switch. A positive or negative DC voltage is applied to the coil such that any change in the voltage measured at the coil/switch junction results in a signal (Info) to reveal a dry soldered joint or physical disconnection of the switch from its circuit board due to eg vibration or ageing. USE/ADVANTAGE - Provides simple continuous testing and ability to perform desired function. Is of particular importance in monitored safety systems.

Description

Die Erfindung betrifft ein Verfahren zur Prüfung mechanischer Schalter in Sicherheitssystemen von Kraftfahrzeugen zum Insassenschutz, ob dieser noch mit der Struktur fest verbunden ist.The invention relates to a method for testing mechanical switches in safety systems of motor vehicles for occupant protection, whether this is still firmly attached to the structure.

In der Kraftfahrzeug-Elektronik (z. B. Airbag), bei der das zuverlässige funktionieren der Elektronikkomponenten für die Sicherheit der Fahrzeug­ insassen sehr entscheidend ist, ist der Hersteller solcher Elektroniken (bzw. der Automobilkonzern, der solche Systeme in sein Kfz einbaut) sehr bemüht, daß er sein System möglichst einem 100%igem Selbsttest nach dem Power On bzw. zyklischen Prüfungen während der gesamten Nutzungsdauer unterzieht, damit evtl. auftretende Fehler, wie z. B. alterungsbeding­ te/vibrationsbedingte Fehler, wie "kalte Lötstellen", welche einen Sy­ stemausfall zur Folge haben können, erkannt werden.In automotive electronics (e.g. airbag), where reliable the electronic components work for the safety of the vehicle occupants is very crucial is the manufacturer of such electronics (or the automotive group that installs such systems in their motor vehicles) very much endeavors that he tries his system as 100% as possible after the Power on or cyclical tests during the entire service life undergoes, so that any errors, such. B. due to aging te / vibration-related errors, such as "cold solder joints", which a Sy failure of the stem can be recognized.

Bei all diesen Prüfungen wird jedoch nicht der mechanische Sicherheits­ schalter bzw. dessen Lötstellen, welcher mit seiner relativ großen Masse besonders empfindlich gegen Vibrationen ist, überprüft, ob er noch ord­ nungsgemäß mit der Leiterplatte verbunden ist. Ein nichtvorhandener Schalter verhält sich wie ein offener Schalter.With all of these tests, however, mechanical safety is not switch or its solder joints, which with its relatively large mass is particularly sensitive to vibrations, checks whether it is still in order is properly connected to the circuit board. An nonexistent one Switch behaves like an open switch.

Aufgabe der Erfindung ist es, einen Verfahren anzugeben zur Prüfung me­ chanischer Schalter in Sicherheitssystemen von Kraftfahrzeugen zum In­ sassenschutz, ob dieser mechanische Schalter noch ordnungsgemäß mit der Platine oder einer anderen Tragestruktur fest verbunden ist.The object of the invention is to provide a method for testing me mechanical switch in security systems of motor vehicles for in seat protection whether this mechanical switch is still working properly with the Board or other support structure is firmly connected.

Die Lösung der Erfindung ist in Anspruch 1 enthalten. Beim Sensor nach der Erfindung speist man für die Prüfung eine positive bzw. negative Spannung an einem Ende der Spule ein und prüft am anderen Ende der Spu­ le, ob eine Spannungsänderung feststellbar ist.The solution of the invention is contained in claim 1. With the sensor after The invention feeds a positive or negative for the test Tension at one end of the coil and check at the other end of the coil le whether a change in voltage can be determined.

Die einzige Figur, die der Beschreibung beigefügt ist, versteht sich hierdurch von selbst. The only figure that accompanies the description is understood thereby by itself.  

Abwandlung der Erfindung können selbstverständlich vorgenommen werden ohne hierdurch den Rahmen der Ansprüche zu verlassen.Modifications of the invention can of course be made without thereby leaving the scope of the claims.

Claims (2)

1. Verfahren zur Prüfung mechanischer Schalter in Sicherheitssyste­ men von Kraftfahrzeugen zum Insassenschutz, ob dieser noch mit der Struktur fest verbunden ist, dadurch gekennzeichnet, daß eine Prüfspu­ le mit dem Schalter elektrisch in Reihe geschaltet ist, durch eine (±)Gleichspannung geschickt wird und geprüft wird, ob eine Spannungs­ änderung (Abfall) feststellbar ist.1. A method for testing mechanical switches in Sicherheitssyste men of motor vehicles for occupant protection, whether this is still firmly connected to the structure, characterized in that a Prüfspu le is electrically connected in series with the switch, is sent by a (±) DC voltage and it is checked whether a voltage change (drop) can be determined. 2. Vorrichtung zum Prüfen von mechanischen Schaltern gemäß Anspruch 1, dadurch gekennzeichnet, daß ein (Zünd-)Kondensator im Prüfstrom­ kreis angeordnet ist, bei dessen Kapazitätsprüfung ein Potentialversatz feststellbar ist.2. Device for testing mechanical switches according to claim 1, characterized in that an (ignition) capacitor in the test current is arranged in its capacity check, a potential offset is noticeable.
DE19924220904 1992-06-25 1992-06-25 Testing mechanically operated switch in vehicle airbag passenger safety system - applying positive or negative voltage to end of test coil and checking for voltage change at other to sense fault caused by vibration in soldered connection on circuit board. Withdrawn DE4220904A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19924220904 DE4220904A1 (en) 1992-06-25 1992-06-25 Testing mechanically operated switch in vehicle airbag passenger safety system - applying positive or negative voltage to end of test coil and checking for voltage change at other to sense fault caused by vibration in soldered connection on circuit board.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19924220904 DE4220904A1 (en) 1992-06-25 1992-06-25 Testing mechanically operated switch in vehicle airbag passenger safety system - applying positive or negative voltage to end of test coil and checking for voltage change at other to sense fault caused by vibration in soldered connection on circuit board.

Publications (1)

Publication Number Publication Date
DE4220904A1 true DE4220904A1 (en) 1994-01-05

Family

ID=6461842

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19924220904 Withdrawn DE4220904A1 (en) 1992-06-25 1992-06-25 Testing mechanically operated switch in vehicle airbag passenger safety system - applying positive or negative voltage to end of test coil and checking for voltage change at other to sense fault caused by vibration in soldered connection on circuit board.

Country Status (1)

Country Link
DE (1) DE4220904A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19619118C1 (en) * 1996-05-11 1997-10-02 Telefunken Microelectron Method for checking the functionality of an output circuit of a trigger circuit of a security system
DE19923729A1 (en) * 1999-05-22 2000-11-23 Nokia Mobile Phones Ltd Circuit arrangement for checking the operational readiness of at least one antenna
CN105487417A (en) * 2015-12-18 2016-04-13 浙江大华系统工程有限公司 Switching quantity output circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3724926A1 (en) * 1987-07-28 1989-02-09 Bayerische Motoren Werke Ag CIRCUIT ARRANGEMENT FOR CHECKING THE LINES OF A SWITCH OR SENSOR
DE3913628A1 (en) * 1988-04-25 1989-11-02 Nippon Denso Co DEVICE AND METHOD FOR DETERMINING THE EXISTENCE OF AN IRREGULARITY IN A VEHICLE OPERATOR PROTECTION SYSTEM
DE3806649C2 (en) * 1987-03-03 1992-02-13 Robert Bosch Gmbh, 7000 Stuttgart, De

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3806649C2 (en) * 1987-03-03 1992-02-13 Robert Bosch Gmbh, 7000 Stuttgart, De
DE3724926A1 (en) * 1987-07-28 1989-02-09 Bayerische Motoren Werke Ag CIRCUIT ARRANGEMENT FOR CHECKING THE LINES OF A SWITCH OR SENSOR
DE3913628A1 (en) * 1988-04-25 1989-11-02 Nippon Denso Co DEVICE AND METHOD FOR DETERMINING THE EXISTENCE OF AN IRREGULARITY IN A VEHICLE OPERATOR PROTECTION SYSTEM

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19619118C1 (en) * 1996-05-11 1997-10-02 Telefunken Microelectron Method for checking the functionality of an output circuit of a trigger circuit of a security system
DE19923729A1 (en) * 1999-05-22 2000-11-23 Nokia Mobile Phones Ltd Circuit arrangement for checking the operational readiness of at least one antenna
US6437577B1 (en) 1999-05-22 2002-08-20 Nokia Mobile Phones Ltd. Circuit to test the working of at least one antenna
CN105487417A (en) * 2015-12-18 2016-04-13 浙江大华系统工程有限公司 Switching quantity output circuit
CN105487417B (en) * 2015-12-18 2018-03-23 浙江大华系统工程有限公司 A kind of switching value output circuit

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8127 New person/name/address of the applicant

Owner name: DEUTSCHE AEROSPACE AG, 80804 MUENCHEN, DE

8139 Disposal/non-payment of the annual fee