Failure diagnostic apparatus and method for a resistor element

Details Failure diagnostic apparatus and method for a resistor element Failure diagnostic apparatus and method for a resistor element

1995-04-21

1997-03-18

Regan, Maura K.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

340436, 324713, 324711, 280738, G01R 2726

Patent

active

056126239

ABSTRACT:
A monitor current to a squib as an air bag actuating element conducts in one and the opposite directions alternately. Each produced voltage value is differentially amplified with a positive reference voltage and a difference between the amplified voltages are calculated. Thus, an offset voltage of an operational amplifier used for the differential amplification is cancelled, and the difference between the two detected voltages becomes a voltage value which will be produced by a monitor current twice as large in current level. Thus, the squib is diagnosed accurately.

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