Antitheft system

Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use

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Details

180287, B60R 2500

Patent

active

048840556

ABSTRACT:
An antitheft vehicle protection system has a remote control unit with which separate messages can be sent to a vehicle mounted protection device. The protection device, a portion of which is placed in a favorable location inside the vehicle such as near a windshield, monitors a variety of vehicle conditions such as the status of door locks, the status of an engine operation control circuit, the insertion of an ignition key and the integrity of the power circuit leading to the antitheft system. One of the messages is decoded as representative of a robbery in progress when certain other alarm conditions such as an open driver's door and a running engine exist. The other message is decoded as representative of a panic condition. Both messages can result in audible alarms. In case of the alarm indicative of a robbery in progress, a delay is interposed to enable a sufficient distance between driver and robber to be achieved before an alarm condition such as an engine lock out is established. A sabotage detection scheme is employed to sense unauthorized tampering with the power supply circuits. An ultrasonic sensor is used to detect unauthorized vehicle entry.

REFERENCES:
patent: 3735346 (1973-05-01), Fox
patent: 3858175 (1974-12-01), Kopera, Jr.
patent: 4143368 (1979-03-01), Route et al.
patent: 4159466 (1979-06-01), Mengel
patent: 4383242 (1983-05-01), Sassover et al.
patent: 4691801 (1987-09-01), Mann et al.
patent: 4754255 (1988-06-01), Sanders et al.
Rev. Esp. Electronica (Spain), vol. 29, No. 328 (Mar. 1982).

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