Anti-theft system for a motor vehicle

Details Anti-theft system for a motor vehicle Anti-theft system for a motor vehicle

1996-12-11

1998-11-17

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

307 104, 307 105, 34082534, 34082554, 34082569, 34082572, 342 52, G01S 1374

Patent

active

058380744

ABSTRACT:
An anti-theft system for a motor vehicle includes a transceiver disposed in a motor vehicle and a portable transponder. If a magnetic alternating field of the transceiver is turned on, energy signals are transmitted inductively to the transponder, where they charge an energy storing device. As soon as the alternating field is turned off, a transponder oscillating circuit oscillates at its resonant frequency. This oscillation is transmitted inductively back to the transceiver. In the process, the resonant frequency is measured. Then, the exciter frequency of the alternating field is adapted to the resonant frequency of the transponder, so that the inductive energy transmission is as effective as possible in subsequent charging operations.

REFERENCES:
patent: 4630044 (1986-12-01), Polzer
patent: 4654658 (1987-03-01), Walton
patent: 4656472 (1987-04-01), Walton
patent: 4738334 (1988-04-01), Weishaupt
patent: 5053774 (1991-10-01), Schuermann et al.
patent: 5287112 (1994-02-01), Schuermann
patent: 5374930 (1994-12-01), Schuermann
patent: 5477214 (1995-12-01), Bartel
patent: 5519376 (1996-05-01), Iijima
patent: 5532522 (1996-07-01), Dietz et al.

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