Remote start, passive anti theft security system
AssigneeDirected Electronics, Inc.
InventorsJerry W. Birchfield, Bounthavy K. Manivone
Life of this patent
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Abstract
A system operable with a passive anti theft security system having a first coil connected to a passive anti theft controller for transmitting a first signal to a first transponder having a third coil and a first code therein, said first transponder responsive to said signal transmitting said first code to said first coil, the system comprising a second transponder having a second code and a fourth coil with two terminal ends wound about said third coil of said second transponder; and a relay selectively shorting or opening said terminal ends of said fourth coil to selectively enable and disable said second transponder.
Claims29
A vehicle starting system comprising a remote starting system that is co-operable with a passive anti theft security system, wherein the security system comprises a first coil connected to a passive anti theft security system controller for transmitting a first signal to a first transponder having a third coil and a first code therein, said first transponder being responsive to said first signal to transmit said first code to said first coil, said controller allowing starting of a vehicle when said first coil receives the first code or a second code in response to transmitting the first signal, and wherein the remote starting system comprises:
- (a) a second transponder having said second code and a second transponder coil that couples the second transponder to the controller;
- (b) a fourth coil with two terminal ends, said fourth coil being wound about said second transponder so as to cause a reduction in electromagnetic coupling between said first coil and said second transponder coil when said terminal ends are shorted, said reduction preventing transmission from said second transponder of said second code to said first coil;
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- (c) a relay that shorts said terminal ends of said fourth coil to prevent transmission of said second code to said controller, and that selectively opens said terminal ends of said fourth coil so as not to prevent transmission of said second code to said controller.
A vehicle starting system comprising a remote starting system that is co-operable with a passive anti theft security system, wherein the vehicle starting system comprises:
- (a) a first coil energized by a passive anti theft security system controller to emit a first signal, said controller allowing starting of a vehicle when said first coil receives a first code or a second code in response to transmitting the first signal;
- (b) a second transponder having said second code and a second transponder coil that couples said second transponder to the controller;
- (c) a fourth coil having at least one loop with two terminal ends, said fourth coil being wound about said second transponder so as to cause a reduction in electromagnetic coupling between said first coil and said second transponder coil when said terminal ends are shorted, said reduction preventing transmission from said second transponder of said second code to said first coil;
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- (d) a relay that shorts said terminal ends of said fourth coil to prevent transmission of said second code to said controller, and that selectively opens said terminal ends of said fourth coil so as not to prevent transmission of said second code to said controller.
A remote starting system that is co-operable with a passive anti theft system, wherein the security system comprises at least one system antenna connected to a passive anti theft security system controller for transmitting a first signal to a first transponder comprising a third antenna, said first transponder being responsive to said first signal to transmit a first code to said at least one system antenna, said controller allowing starting of a vehicle when said controller receives, through said at least one system antenna, the first code or a second code in response to transmitting the first signal, the remote starting system comprising:
- (a) a second transponder comprising a second transponder antenna that couples the second transponder to the controller through the at least one system antenna, said second transponder being responsive to said first signal to transmit said second code to said at least one system antenna;
- (b) a fourth coil with two terminal ends, said fourth coil being wound around at least a portion of said second transponder antenna so as to shield said at least one system antenna from said second transponder antenna when said terminal ends are shorted, thereby preventing transmission from said second transponder of said second code to said controller through said at least one system antenna;
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- (c) a relay that selectively shorts said terminal ends of said fourth coil to prevent transmission of said second code from said second transponder antenna to said controller through said at least one system antenna, and that selectively opens said terminal ends of said fourth coil so as not to prevent transmission of said second code from said second transponder antenna to said controller through said at least one system antenna.
A vehicle starting system comprising a remote starting system that is co-operable with a passive anti theft security system, wherein the security system comprises a first coil connected to a passive anti theft system controller for transmitting a first signal to a first transponder having a third coil and a first code therein, said first transponder being responsive to said first signal to transmit said first code to said first coil, said controller allowing starting of a vehicle when said first coil receives the first code or a second code in response to transmitting the first signal, and wherein the remote starting system comprises:
- (a) a second transponder having said second code and a fourth coil with two terminal ends, said fourth coil being wound about said second transponder so as to reduce electromagnetic coupling between said first coil and said second transponder when said terminal ends are shorted, thereby preventing transmission from said second transponder of said second code to said first coil, and so as to increase electromagnetic coupling between said first coil and said second transponder when said terminal ends are opened;
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- (b) a relay that shorts said terminal ends of said fourth foil to disable said second transponder and prevent transmission of said second code to said controller when said passive anti theft security system is in operation, and that selectively opens said terminal ends of said fourth coil to enable said second transponder and allow transmission of said second code to said second controller when said remote starting system is in operation.
A vehicle starting system comprising a remote starting system that is co-operable with a passive anti theft security system, wherein the vehicle starting system comprises:
- (a) a first coil energized by a passive anti theft security system controller to emit a first signal, said controller allowing starting of a vehicle when said first coil receives a first code or a second code in response to transmitting the first signal;
- (b) a second transponder having said second code and a fourth coil having at least one loop with two terminal ends, said fourth coil being wound about said second transponder so as to reduce electromagnetic coupling between said first coil and said second transponder when said terminal ends are shorted, thereby preventing transmission from said second transponder of said second code to said first coil, and so as to increase electromagnetic coupling between said first coil and said second transponder when said terminal ends are opened;
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- (c) a relay that shorts said terminal ends of said fourth coil to disable said second transponder and prevent transmission of said second code to said controller when said passive anti-theft security system is in operation, and that selectively opens said terminal ends of said fourth coil to enable said second transponder and allow transmission of said second code to said controller when said remote starting system is in operation.
Dependencies are inferred from the claim text.