Communications: electrical – Selective – Having indication or alarm
Patent
1981-09-18
1984-07-31
Trafton, David L.
Communications: electrical
Selective
Having indication or alarm
180287, 307 10AT, 340310A, 34082532, 340538, 340543, B60R 2504
Patent
active
044633408
ABSTRACT:
The anti-theft control system includes a sending module (A) for sending encoded signals on a power line (12) of a vehicle power supply (B). The sending module (A) includes a keyboard (52) on which an authorized user enters his code. If the proper code is entered, a digital encoder (40) produces a preselected encoded signal which is imposed on the power signal by an interface circuit (60). The anti-theft control system further includes a receiving module (C) which receives encoded signals from the power line. The receiving module includes a detector (70) for separating encoded signals from the power signal and a decoder (80) for comparing the received encoded signal with the preselected encoded signal. If the decoder (80) determines that the preselected encoded signal has been received, it enables an ignition control circuit (90) to pass electric power from the vehicle ignition key switch (20) to the vehicle ignition (22). Optionally, an alarm control circuit (100) may enable an alarm a predetermined time determined by delay timer (114), after the vehicle is entered unless the alarm control circuit (100) is disabled by the detector (80).
REFERENCES:
patent: 3209326 (1965-09-01), Heiser
patent: 3740713 (1973-06-01), Teich
patent: 3784839 (1974-01-01), Weber
patent: 4090089 (1978-05-01), Morello et al.
patent: 4123748 (1978-10-01), Otani
patent: 4143368 (1979-03-01), Route et al.
patent: 4180043 (1979-12-01), Kawamura
patent: 4209709 (1980-06-01), Betton
patent: 4236594 (1980-12-01), Ramsperger
Adkins Joey B.
Frantz Jack W.
Issa Darrell E.
Trafton David L.
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