Method for transmitting signals between a microprocessor and an

Details Method for transmitting signals between a microprocessor and an Method for transmitting signals between a microprocessor and an

1996-10-04

1998-06-02

Elms, Richard T.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

180282, 280735, 34031001, 701 45, B60R 2100

Patent

active

057604894

ABSTRACT:
A control module (11) in an airbag system (10) supplies electrical energy to and communicates with remote modules (20A-20N) through a two-wire connection. The supplied electrical energy is partially used to operate the remote modules (20A-20N) and partially stored within the remote modules (20A-20N) for deploying squibs (22A-22N). The control module (11) sends command signals to the remote modules 20A-20N) via voltage excursions between a high and an intermediate voltage levels. The remote modules (20A-20N) send signals to the control module (11) via current excursions. When an accident situation is detected, the voltage across the two-wire connection is lowered to a low voltage level, thereby interrupting a normal operation of the airbag system (10). The control module (11) then sends out firing signals via voltage excursion between the intermediate and low voltage levels. The remote modules (20A-20N) decode the firing signals and deploy the squibs (22A-22N) to inflate airbags.

REFERENCES:
patent: 4571735 (1986-02-01), Furse
patent: 5142278 (1992-08-01), Moallemi et al.
patent: 5225986 (1993-07-01), Mickeler et al.
patent: 5473635 (1995-12-01), Chevroulet
Chrysler Corporation--Vehicle Engineering Office, Engineering Standard, Performance Standard, "Integrated Circuit--CSC Bus Driver/Receiver Master Interface", No: PPF-391E-266, Apr. 12, 1996, whole document.

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