Anti-theft device having excellent identification code overwriting capabilities
AssigneeDenso Corporation
InventorsMasahiro Goto, Ikuo Hayashi, Takahide Kitahara, Fumio Asakura, Ryozo Okumura, Kiyokazu Yoshida
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Abstract
A controller drives a key interlock solenoid to lock a key so that the key cannot be pulled out of a key cylinder when a shift lever is not at a parking position or while an identification code is being sent to a transponder mounted in the key. Thus, the key cannot be pulled out of the key cylinder during the writing of the identification code in the transponder.
Claims20
An anti-theft device for use in a target device into which a transponder-carrying portable device is inserted in a position which permits operation of the target device, said anti-theft device comprising:
- a memory for storing a target identification code;
- communication means for receiving a transponder identification code from said transponder and for sending a new identification code to said transponder;
- determination means for determining that said transponder identification code received by said communication means is invalid unless said transponder identification code matches said target identification code stored in said memory;
- control means for inhibiting operation of said target device when said determination means determines that said transponder identification code is invalid;
- locking means for preventing said portable device from being removed from said position in the target device until said communication means completes sending said new identification code to said transponder;
- and
- wherein the determination means additionally verifies that the new identification code received by the transponder matches the new identification code sent by the communication means.
An anti-theft device for use in a target device to which a transpondler-carrying portable device is inserted in a position which permits operation of the target device, said anti-theft device comprising:
- a memory which stores a target device identification code;
- a code generator which generates a new identification code;
- a transceiver which receives a transponder identification code from said transponder and which sends said new identification code generated by said code generator to said transponder;
- determination means for determining that said transponder identification code received by said transceiver is invalid unless said transponder identification code matches said target identification code stored in said memory;
- a controller which inhibits operation of said target device when said determination means that said transponder code is invalid;
- and
- locking means for preventing said portable device from being removed from said position in the target device until said transceiver completes sending said new identification code to said transponder;
- and
- wherein the determination means additionally verifies that the new identification code received by the transponder matches the new identification code sent by the transceiver.
A method for preventing theft of a target device and for overwriting a transponder identification code of a transponder of a transponder-carrying portable device that is inserted into a position in said target device which permits operation of the target device, said method comprising:
- storing a reference identification code;
- receiving a first transponder identification code transmitted by said transponder;
- determining if said first transponder identification code matches said references identification code;
- inhibiting operation of said target device unless said first transponder identification code matches said reference identification code;
- generating a new identification code when said first transponder identification code matches said reference identification code;
- sending said new identification code to the transponder to overwrite said first transponder identification code of said transponder with said identification code;
- preventing said portable device from being removed from said target device while executing said overwriting;
- and
- verifying that said new identification code received by the transponder matches the new identification sent to the transponder.
Dependencies are inferred from the claim text.