An anti-theft ignition system including a generally tamper-proof canister or housing substantially covering the solenoid of the starter motor with a portion thereof covering the ignition switch terminal of the solenoid. The housing includes a compartment for receiving electronic circuitry including an encoded circuit coupled to or forming a part of a microcomputer operable in response to proper sequential actuation of the ignition key for energizing a silicon controlled rectifier in series relation with the ignition switch.

Anti-theft ignition system

An electronic anti-theft device for an automobile including a dashboard unit and an engine compartment unit. The dashboard unit is equipped with a combination lock mechanism which in the undialed position is operative to short out both the automobile ignition coil and the distributor. The dashboard unit also includes an armored cable which houses a folded over ignition wire and wires from both the distributor and ignition coil. The engine compartment unit includes three separate but related embodiments, each of which includes means for enabling the automobile horn to provide an audible alarm as long as the combination lock is not correctly dialed or an attempt is made to disable the dashboard unit and to steal the automobile.

Leslie A. Hall

Papers

Theft - prevention ignition system with electronic voltage regulation for vehicles