Vehicle antitheft system

Patent

Vehicle antitheft system

- 21 Mar 1977

19

TL;DR: In this paper, a passive vehicle antitheft system utilizes a unique combination of condition responsive switching components to control the access to and use of a vehicle, including a control relay including a first "protection" position in which the vehicle ignition system and starter are disabled and an alarm system is enabled and a second "use" position where the ignition and starter were enabled and the alarm system was disabled.

Abstract: A passive vehicle antitheft system utilizes a unique combination of condition responsive switching components to control the access to and use of a vehicle. Primary control over the vehicle is provided by a control relay including a first "protection" position in which the vehicle ignition system and starter are disabled and an alarm system is enabled and a second "use" position in which the ignition system and starter are enabled and the alarm system is disabled. The control relay is in turn controlled by three bistable switching components that are selectively enabled and disabled at various stages of use of the vehicle. The switching components, which in the preferred embodiment comprise a triac, a silicon controlled rectifier, and a second relay, automatically switch the control relay to its "protection" position as an authorized user leaves the vehicle and closes the last vehicle door. The switching components are also interconnected and arranged to provide protection against attempts to tamper with or defeat the system.

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Citations

Patent

Vehicle securing and lockout prevention system

James R. Henderson, +1 more

- 18 Jan 1980

TL;DR: In this article, a solid state vehicle securing and lockout prevention system for an automobile having power operated accessories such as automatic door lock, power door windows, power roof window, power trunk release, power hood release, and power antenna control, and a horn selectively identifies authorized users to enable operation of the ignition, prevents lockout of the operator, and secures the vehicle and its accessories upon departing from the vehicle.

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69

Patent

Vehicle security system

Brian Wholey, +1 more

- 24 May 2002

TL;DR: In this paper, a vehicle security system for a vehicle cargo area provided with a conductor which passes around substantially all of the circumference of the cargo area, the security system comprising connection means for passing a signal through the conductor, and monitoring means for monitoring the signal, the monitoring means being arranged to ensure that the signal remains within one or more predetermined boundaries, and to activate an alarm if the signal moves outside of the one or multiple boundaries.

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39

Patent

Anti-carjacking apparatus

Kashyap Majmudar

- 06 Dec 1995

TL;DR: In this article, an approach for disabling the operation of a vehicle (10) in the event of an attempted theft thereof is presented, where a switch (32) is provided in the ignition circuit (17).

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31

Patent

Automotive anti-theft device

John-Cyril P. Hanisko, +1 more

- 09 Jan 1986

TL;DR: In this article, an anti-theft device for automobile vehicles disables the vehicle's starter ignition system unless a coded resistive element is inserted into the device by the vehicle operator.

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23

Patent

Identification systems employing frequency-based coded information

Michael Vershinin, +1 more

- 29 Dec 1995

TL;DR: An identification or protection system for vehicles, doors, lights and other electronic objects possessing a disabled state, having a disabling circuit operatively associated with the identification system so that when said resulting circuit is activated, the object achieves its disabled state; a transmitter transmitting a signal for a period of time at least once during a succession of time intervals using frequency-based coding; a receiver configured to receive the signal transmitted by the transmitter, the receiver causing the disabling circuit to disable the object when the receiver does not receive a number of consecutive signals from said transmitter which exceeds a pre-determined

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References

Patent

Vehicle anti-theft alarm system

Paul J. Horvath

- 02 Jun 1975

TL;DR: In this article, an electrical-electronic circuit for operating the horn and headlights of a car in a manner which will give audible and visual warning of a theft attempt is presented.

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