Vehicle anti-theft system
First Claim
1. An anti-theft system for a vehicle having a passenger compartment and another compartment which is normally inaccessible to a person within the passenger compartment comprising a transmitter adapted for carrying by an authorized driver and having switch means thereon, said transmitter being operative responsive to the operation of said switch means for transmitting an access identification wireless carrier signal of predetermined frequency which is modulated by a tone of predetermined frequency for identifying an authorized operator;
- and means mounted in said inaccessible vehicle compartment, said vehicle-mounted means including means for detecting said access identification wireless carrier signal of said predetermined frequency modulated by said tone of predetermined frequency for origination within said inaccessible compartment a control signal indicative of the operation of said transmitter by a person desiring to operate the vehicle, means connected to the vehicle ignition system and being normally operative for disabling the vehicle ignition system, and means connected to said detecting means, the electrical system of the vehicle and said disabling means for inhibiting the operation of said disabling means responsive to the ignition switch of the vehicle being turned on and the initial origination of said control signal to allow the ignition system to operate and to remain operated, even after said detecting means ceases to operate, until the ignition switch is turned off.
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Accused Products
Abstract
An anti-theft system for cars and the like. A receiver is mounted in the trunk of the vehicle. A first receiver wire is connected to the electrical system of the car for supplying power to the receiver only when the ignition switch is turned on. A second, normally grounded, receiver wire is extended to the ignition coil for preventing operating of the ignition system. To remove the ground from this second conductor, it is necessary to operate a small transmitter while the ignition switch is turned on. The transmitter and the receiver are sold as a pair, the receiver being tuned to recognize a coded signal from only the paired transmitter. Once the ignition system is turned on, the disabling ground potential is held removed from the second conductor even though the transmitter is no longer operated. When the ignition system is subsequently turned off, the disabling potential is automatically applied to the second conductor and the anti-theft system is re-armed with no action being required of the driver other than the turning off of the ignition switch. A key-operated switch is provided on the receiver to allow the driver to de-activate the system when that is desired, for example, when the car is parked in a public garage.
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Citations
9 Claims
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1. An anti-theft system for a vehicle having a passenger compartment and another compartment which is normally inaccessible to a person within the passenger compartment comprising a transmitter adapted for carrying by an authorized driver and having switch means thereon, said transmitter being operative responsive to the operation of said switch means for transmitting an access identification wireless carrier signal of predetermined frequency which is modulated by a tone of predetermined frequency for identifying an authorized operator;
- and means mounted in said inaccessible vehicle compartment, said vehicle-mounted means including means for detecting said access identification wireless carrier signal of said predetermined frequency modulated by said tone of predetermined frequency for origination within said inaccessible compartment a control signal indicative of the operation of said transmitter by a person desiring to operate the vehicle, means connected to the vehicle ignition system and being normally operative for disabling the vehicle ignition system, and means connected to said detecting means, the electrical system of the vehicle and said disabling means for inhibiting the operation of said disabling means responsive to the ignition switch of the vehicle being turned on and the initial origination of said control signal to allow the ignition system to operate and to remain operated, even after said detecting means ceases to operate, until the ignition switch is turned off.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
Specification