Anti-vehicle-thief apparatus

Details Anti-vehicle-thief apparatus Anti-vehicle-thief apparatus

1995-12-27

1997-11-04

Hofsass, Jeffery

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

3408253, 34082534, 34082554, 307 102, 361171, 1231792, B60R 2510

Patent

active

056844549

ABSTRACT:
An anti-vehicle-thief apparatus having an immobilizer unit for comparing a specific first code received from a transponder to a stored code just after an engine is started, and when these codes are identical, outputting a second code to an EGI unit, the EGI unit for comparing the second code to a stored code, and when these codes are identical, permitting the engine to continue operation, a CPU for counting the number of times that an ignition switch power supply is turned ON and OFF during a code comparison time period, and backup RAM capable of storing the counted number of times that the ignition switch power supply is turned ON and OFF for a predetermined time period. When the ignition switch power supply is turned ON and OFF repeatedly more than a predetermined number of times, the EGI unit causes the engine to stop.

REFERENCES:
patent: 4463340 (1984-07-01), Adkins et al.
patent: 4965460 (1990-10-01), Tanaka et al.
patent: 4982072 (1991-01-01), Takigami
patent: 5245330 (1993-09-01), Wassink
patent: 5422632 (1995-06-01), Bucholtz et al.
patent: 5495235 (1996-02-01), Durinovic-Johri et al.
Revue Technique Automobile, Nouvelle Petite Volkswagen, Dec. 1, 1994, vol. 49, No. 568, pp. XXXVI-XLII.

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