Resistance measurement circuit for external deployment path of s

Details Resistance measurement circuit for external deployment path of s Resistance measurement circuit for external deployment path of s

1993-09-08

1995-10-24

Mancuso, Joseph

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

324550, 324715, 324718, 307 101, 280735, B60R 2108, B60Q 100

Patent

active

054613582

ABSTRACT:
An inflatable restraint system includes a diagnostic circuit which measures the resistance of an external deployment path containing a squib. The circuit supplies a test current through the path and measures the voltage across the path which is monitored by a microprocessor. A vehicle battery supplies the power to the system and is connected to a constant current source in series with the external path to provide the test current. A current limiting device between the external circuit and ground comprises a current sink allowing a maximum safe current in the external circuit in the event of inadvertent application of battery voltage to the external circuit and, during a normal resistance test, imposes only a small voltage drop on the test current circuit.

REFERENCES:
patent: 3714627 (1973-01-01), Dillman et al.
patent: 4243971 (1981-01-01), Suchowerskyj et al.
patent: 4574233 (1986-03-01), Taylor
patent: 4893109 (1990-01-01), Vrabel et al.

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