Patent
Auto anti-theft device
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TLDR
In this article, a solenoid-operated valve is disposed in the fuel line of an automobile to interrupt the fuel flow to the carburetor in case of deenergization.Abstract:
A solenoid-operated valve is disposed in the fuel line of an automobile to interrupt the fuel flow to the carburetor when the solenoid is deenergized. The solenoid operated valve is maintained in its fuel-open position only when both the automobile ignition switch is closed and a supplementary concealed switch is closed. The circuitry for operating the valve may include either a relay or an electronic device. An indicator light is illuminated during the fuel-closed position of the solenoid operated valve as a reminder that both switches must be operated to permit vehicle movement.read more
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References
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Patent
Automatic tamper alarm for motor vehicles
TL;DR: In this paper, a self resetting tamper alarm is used to activate a motor vehicle horn when one of a plurality of input lines detects the closure of a normally open switch.
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TL;DR: A self-activating automobile theft prevention device including a time delay relay, preferably of the thermal type, was proposed in this article, which can interrupt the ignition of an automobile unless, within a predetermined time after activation of the ignition circuit, a concealed relay-defeating switch is activated.
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