Inflatable restraint firing circuit diagnostics

Details Inflatable restraint firing circuit diagnostics Inflatable restraint firing circuit diagnostics

1989-12-08

1991-09-03

Scott, J. R.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

280735, 340436, B60R 2116

Patent

active

050461494

ABSTRACT:
The firing circuit for an inflatable restraint for a vehicle includes a storage capacitor which is charged from a 36 volt regulated power supply. The power supply is energized from the vehicle battery through the ignition switch. Both the battery and the capacitor are connected with the squib through impact sensor switches. A computer monitors the voltage at the squib to determine if an energy source is connected with the squib. The energization of the regulated power supply is delayed for a predetermined time interval following ignition switch activation to insure that the voltage initially monitored by the computer is applied to the monitoring junction from the battery and not from the capacitor.

REFERENCES:
patent: 4438424 (1984-03-01), Yasui
patent: 4938504 (1990-07-01), Fukuda et al.
patent: 4968965 (1990-11-01), Naitou et al.

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