Abstract: A method and device for triggering, via an RFID reader (5) endowed with a transmitting antenna (6), a procedure for actuating an element for locking/unlocking the access doors (2) of a motor vehicle (1). A coil (7) is arranged in the vicinity and in the field of action of the transmitting antenna (6), and: the RFID reader (5) is commanded so as to control the successive transmission of electromagnetic pulses of the same power, upon each pulse, a value representative of the electrical voltage at the terminals of the coil (7) is measured, and the procedure for actuating the locking/unlocking element is triggered in the event of a variation in the measured values greater than a determined value.

Abstract: A method and device for triggering, via an RFID reader (5) endowed with a transmitting antenna (6), a procedure for actuating an element for locking/unlocking the access doors (2) of a motor vehicle (1). A coil (7) is arranged in the vicinity and in the field of action of the transmitting antenna (6), and: the RFID reader (5) is commanded so as to control the successive transmission of electromagnetic pulses of the same power, upon each pulse, a value representative of the electrical voltage at the terminals of the coil (7) is measured, and the procedure for actuating the locking/unlocking element is triggered in the event of a variation in the measured values greater than a determined value.

Abstract: The device comprises electronic means (2, 3) for querying a transmitter-receiver circuit (1) carried by a person wishing to open the said door, for recognising a predetermined code sent in reply by the said circuit and for subsequently commanding the removal of a locking pin (10) from a catch (11) of a door latch (8) forming part of the lock, and means for the activating of the electronic means (2, 3) by the said person. The said activating means (13) are designed for operating a dialogue between the said electronic means (2, 3) and the circuit (1) and the optional unlocking of the door latch (8) of the lock before the said person's action on the handle (6) causes the door to be blocked by the friction of the pin (10) in the said catch (11) of the door striker (8).

Abstract: A remote power-feeding and protection system for equipment connected by two transformers to a four-wire transmission link.The remote power-feeding and protection system and the remote power-feeding extractor protection device are intended for equipment connected by two transformers to a transmission link with two pairs of wires ensuring remote power-feeding of the fed equipment.Each transformer is connected to the two wires of one pair by two identical windings serially-connected between these two wires through a capacitor. The two pairs of wires constitute a phantom feed circuit, the two wires of a given pair being connected to the same terminal of a D.C. generator. The extraction and protection device comprises two rectifier bridges each separately connected by their inputs to a pair of wires and interconnected by their outputs in order to provide remote power feeding.