Vehicular antitheft apparatus using an identification code trans

Details Vehicular antitheft apparatus using an identification code trans Vehicular antitheft apparatus using an identification code trans

1994-08-29

1998-06-30

Hofsass, Jeffery

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

340542, 340539, 34082532, 307 102, 307 105, B60R 2510

Patent

active

057740437

ABSTRACT:
When an ignition switch detects that a key rotor of an ignition key cylinder has been turned to the accessory position by a key, a controller energizes a primary coil to cause it to output a high-frequency signal. In the key, a secondary battery is charged with a constant DC voltage generated from an AC voltage induced across a secondary coil. A transmission circuit is powered by the secondary battery, and allowed by a timer circuit to transmit a radio signal including an identification code during a predetermined period after the high-frequency signal is received by the key. Alternatively, the controller energizes the primary coil plural times with a cycle consisting of predetermined output and pause periods if the transmitted identification code does not coincide with a preset identification code at the first comparing attempt.

REFERENCES:
patent: 4222034 (1980-09-01), Orenzow
patent: 4296402 (1981-10-01), Szczepanski
patent: 4835407 (1989-05-01), Kataoka et al.
patent: 4868409 (1989-09-01), Tanaka et al.
patent: 4996514 (1991-02-01), Sunami
patent: 5043593 (1991-08-01), Tsutsumi et al.
patent: 5086288 (1992-02-01), Stramer
patent: 5132667 (1992-07-01), Cranford
patent: 5457438 (1995-10-01), Ziegler
patent: 5477214 (1995-12-01), Bartel

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