Device for monitoring the closure of the opening points of a mot

Details Device for monitoring the closure of the opening points of a mot Device for monitoring the closure of the opening points of a mot

1991-06-04

1993-10-05

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

307 102, 180289, 70257, 70264, E05B 4700

Patent

active

052508498

ABSTRACT:
The invention relates to a device for monitoring the closure of the opening points of a motor vehicle, in which each opening point is equipped with a closure contact which is connected to a central unit. It is characterized in that the central unit is connected to all the opening points by a single common line (8) with two conductors (31, 32), in that the central unit comprises at least one periodic-signal generator (28) connected to the said two conductors, in that each opening point comprises a passive receiver circuit tuned to the frequency of the periodic signal supplied by the said generator (28) of the central unit, the said passive circuit being connected in series with the closure contact of the said opening point, and in that the said device comprises, furthermore, indicia of a closure fault in response to the variations of the signal generated by the generator in response to the actuation of the corresponding closure contact.

REFERENCES:
patent: 3975708 (1976-08-01), Lusk et al.

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