Failure diagnostic apparatus and method for a resistor element
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United States of America Patent
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-
Mar 18, 1997
Grant Date -
N/A
app pub date -
Apr 21, 1995
filing date -
May 27, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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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