Anti-theft car protection device
First Claim
1. An anti-theft protection device for a motor vehicle, comprising:
- a key having an IC-chip embedded therein;
a first structure mounted in said motor vehicle, said first structure including an ignition switch that can be turned by said key to an "OFF" position, an "ACC" position and an "ON" position;
an antenna mounted on said first structure near said ignition switch;
a communication module mounted on said first structure to provide a radio communication between the IC-chip of said key and said antenna; and
an immobilizer controller mounted on said first structure to determine, in accordance with an instruction signal issued from said communication module, whether or not said engine should be started,wherein said communication module includes an electric field generating circuit that energizes the IC-chip of said key by causing said antenna to emit an electromagnetic wave, a transmitting/receiving circuit which carries out exchange of ID-codes with said IC-chip through said antenna, and a system control circuit that controls both said electric field generating circuit and said transmitting/receiving circuit, andwherein said system control circuit causes said electric field generating circuit to make said antenna emit the electromagnetic wave when said ignition switch is turned to the "ACC" position by said key, and said system control circuit issues an engine start permitting signal to said immobilizer controller to permit said engine to start only when an ID-code received by said transmitting/receiving circuit from said IC-chip coincides with an ID-code previously memorized in said system control circuit, andwherein said system control circuit transmits, with an aid of said transmitting/receiving circuit, a new ID-code to said IC-chip to write the new ID-code to said IC-chip and memorizes the new ID-code in said system control circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
An anti-theft car protection device includes a key having an IC-chip embedded therein, and an ignition switch that can be turned by the key to any "OFF" position, an "ACC" position and an "ON" position. The device further includes an antenna mounted near the ignition switch, and a communication module that provides a radio communication between the IC-chip of the key and the antenna. The device also includes an immobilizer controller that determines, in accordance with an instruction signal issued from the communication module, whether or not the engine should be started. The communication module includes an electric field generating circuit that energizes the IC-chip of the key by causing the antenna to emit an electromagnetic wave, a transmitting/receiving circuit that carries out exchange of ID-codes with the IC-chip through the antenna, and a system control circuit that controls both the electric field generating circuit and the transmitting/receiving circuit.
38 Citations
14 Claims
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1. An anti-theft protection device for a motor vehicle, comprising:
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a key having an IC-chip embedded therein; a first structure mounted in said motor vehicle, said first structure including an ignition switch that can be turned by said key to an "OFF" position, an "ACC" position and an "ON" position; an antenna mounted on said first structure near said ignition switch; a communication module mounted on said first structure to provide a radio communication between the IC-chip of said key and said antenna; and an immobilizer controller mounted on said first structure to determine, in accordance with an instruction signal issued from said communication module, whether or not said engine should be started, wherein said communication module includes an electric field generating circuit that energizes the IC-chip of said key by causing said antenna to emit an electromagnetic wave, a transmitting/receiving circuit which carries out exchange of ID-codes with said IC-chip through said antenna, and a system control circuit that controls both said electric field generating circuit and said transmitting/receiving circuit, and wherein said system control circuit causes said electric field generating circuit to make said antenna emit the electromagnetic wave when said ignition switch is turned to the "ACC" position by said key, and said system control circuit issues an engine start permitting signal to said immobilizer controller to permit said engine to start only when an ID-code received by said transmitting/receiving circuit from said IC-chip coincides with an ID-code previously memorized in said system control circuit, and wherein said system control circuit transmits, with an aid of said transmitting/receiving circuit, a new ID-code to said IC-chip to write the new ID-code to said IC-chip and memorizes the new ID-code in said system control circuit. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10)
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7. In an anti-theft protection device for a motor vehicle, said device comprising a key having an IC-chip embedded therein;
- a first structure mounted in said motor vehicle, said first structure including an ignition switch that can be turned by said key to an "OFF" position, an "ACC" position and an "ON" position;
an antenna mounted on said first structure near said ignition switch;
a communication module mounted on said first structure to provide a radio communication between the IC-chip of said key and said antenna; and
an immobilizer controller mounted on said first structure to determine, in accordance with an instruction signal issued from said communication module, whether or not an engine of said motor vehicle should be started, wherein said communication module includes an electric field generating circuit that energizes the IC-chip of said key by causing said antenna to emit an electromagnetic wave, a transmitting/receiving circuit that carries out exchange of ID-codes with said IC-chip through said antenna, and a system control circuit that controls both said electric field generating circuit and said transmitting/receiving circuit, and wherein said system control circuit issues an engine start permitting signal to said immobilizer controller to permit said engine to start only when, with the ignition switch having been turned to said "ACC" position by said key to cause said electric field generating circuit to energize said IC-chip, an ID-code received by said transmitting/receiving circuit from said IC-chip coincides with an ID-code previously memorized in said system control circuit,a method of initializing said anti-theft protection device, said method comprising the steps of; (a) preparing a given key having an IC-chip fixed thereto, said IC-chip having a given ID-code written thereto; (b) mounting said communication module on said motor vehicle without permitting said system control circuit to memorize the given ID-code; (c) turning said ignition switch to said "ACC" position by using said key thereby to transmit the given ID-code of the IC-chip of said key to said transmitting/receiving circuit; (d) permitting said system control circuit to memorize said given ID-code therein; and (e) removing said key from said ignition switch. - View Dependent Claims (8, 11, 12, 13, 14)
- a first structure mounted in said motor vehicle, said first structure including an ignition switch that can be turned by said key to an "OFF" position, an "ACC" position and an "ON" position;
Specification