GB1390126A - Combination of a failure check circuit and a circuit to be checked - Google Patents

Combination of a failure check circuit and a circuit to be checked

Info

Publication number
GB1390126A
GB1390126A GB1415572A GB1415572A GB1390126A GB 1390126 A GB1390126 A GB 1390126A GB 1415572 A GB1415572 A GB 1415572A GB 1415572 A GB1415572 A GB 1415572A GB 1390126 A GB1390126 A GB 1390126A
Authority
GB
United Kingdom
Prior art keywords
resistors
checks
resistor
common point
test pulses
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.)
Expired
Application number
GB1415572A
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.)
Hitachi Ltd
Nissan Motor Co Ltd
Original Assignee
Hitachi Ltd
Nissan Motor Co Ltd
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 Hitachi Ltd, Nissan Motor Co Ltd filed Critical Hitachi Ltd
Publication of GB1390126A publication Critical patent/GB1390126A/en
Expired 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
    • B60R21/0176—Diagnostic or recording means therefor for firing circuits using only mechanical switches as collision detecting means, in series with pyrotechnic fuses
    • 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
    • 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
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
    • G01R31/2836—Fault-finding or characterising

Landscapes

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

Abstract

1390126 Crash restraint bags HITACHI Ltd and NISSAN JIDOSHA KK 27 March 1972 [26 March 1971] 14155/72 Heading B7B [Also in Division G1] An arrangement for checking whether any of a number of resistors B1-B4, connected in parallel between common points P1, P2, is open-circuited or short-circuited to earth comprises a diode D5-D8 connected in series with each resistor, a high resistance path R from the common point P2 to earth, a generator P.G. for supplying test pulses to the common point P1, and a detector A2 which checks that the test pulses appear at every one of the junctions P7-P10 between each resistor and diode. In a modification which enables a particular faulty resistor to be identified and also checks diodes D5-D8, further diodes D1-D4 are included, frequency dividers F1-F4 apply test pulses in turn to each of the junctions P3-P6 between the resistors and the further diodes, and a detector A1 checks that each applied pulse also appears at the common point P2. The resistors B1-B4 may form part of a crash restraint air or gas bag system in a vehicle, the heat generated in the resistors when crash-detect switches S1 S2 close firing explosives to remove obstructions disposed between gas cylinders and the air bags. Alternatively they may form part of a fire alarm system.
GB1415572A 1971-03-26 1972-03-27 Combination of a failure check circuit and a circuit to be checked Expired GB1390126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1722271A JPS5616479B1 (en) 1971-03-26 1971-03-26

Publications (1)

Publication Number Publication Date
GB1390126A true GB1390126A (en) 1975-04-09

Family

ID=11937902

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1415572A Expired GB1390126A (en) 1971-03-26 1972-03-27 Combination of a failure check circuit and a circuit to be checked

Country Status (7)

Country Link
US (1) US3803569A (en)
JP (1) JPS5616479B1 (en)
AU (1) AU442040B2 (en)
CA (1) CA969619A (en)
DE (1) DE2213977C3 (en)
FR (1) FR2130694B1 (en)
GB (1) GB1390126A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007713A (en) * 1975-08-28 1977-02-15 Hydrolevel Corporation Test circuit
US4041374A (en) * 1976-03-15 1977-08-09 Rca Corporation Interelectrode open and short circuit tester
DE2808872C2 (en) * 1978-03-02 1986-01-23 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Trigger circuit for an occupant protection device in motor vehicles
AU8149582A (en) * 1982-03-08 1983-10-18 Laughlin, Stephen Robert A circuit arrangement for enabling simultaneous operation of independent ac circuits
DE3809580A1 (en) * 1988-03-22 1989-10-12 Bosch Gmbh Robert ELECTRONIC DEVICE
JPH0753499B2 (en) * 1988-05-12 1995-06-07 三菱電機株式会社 Failure detection device for airbag device
FR2632218A1 (en) * 1988-06-03 1989-12-08 Lacoste Jean Method of crimping metal parts using forming by magnetic pressure and articles arising from the implementation of the method
DE3831335C1 (en) * 1988-09-15 1990-01-11 Messerschmitt-Boelkow-Blohm Gmbh, 8012 Ottobrunn, De Trigger circuit for a device for protecting occupants of a vehicle
US4956631A (en) * 1989-03-20 1990-09-11 Mitsubishi Denki Kabushiki Kaisha Fault detector for vehicle safety system

Also Published As

Publication number Publication date
AU4041172A (en) 1973-11-15
DE2213977C3 (en) 1975-07-17
DE2213977A1 (en) 1972-11-23
US3803569A (en) 1974-04-09
CA969619A (en) 1975-06-17
JPS5616479B1 (en) 1981-04-16
AU442040B2 (en) 1973-11-15
FR2130694A1 (en) 1972-11-03
DE2213977B2 (en) 1974-12-05
FR2130694B1 (en) 1978-07-07

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years