Vehicle antitheft system
First Claim
1. An antitheft system comprising:
- a first transmitter for transmitting a first ID signal;
a second transmitter for transmitting the first ID signal;
a first receiver for receiving the first ID signal transmitted from one of the first and second transmitters; and
a first checker for checking whether the first ID signal received by the first receiver corresponds to a first registered signal, whereinthe first transmitter comprises a first memory for storing the first ID signal, and transmits the first ID signal stored in the first memory,the second transmitter comprises a second memory for storing the first ID signal, and transmits the first ID signal stored in the second memory, andthe second transmitter further comprises a control section for transmitting a second ID signal in a first control mode, for storing the first ID signal into the second memory in a second control mode, and for transmitting the first ID signal stored in the second memory in a third control mode.
1 Assignment
0 Petitions
Accused Products
Abstract
A key for a vehicle has a push button, a first transmitter-receiver circuit for transmitting a first ID signal stored in a first memory in response to an ID request signal, and a second transmitter-receiver circuit for transmitting a second ID signal in response to a pressing operation of the push button. An in-car antitheft system has a check circuit for comparing the received first ID signal with a registered ID, and an engine control circuit for inhibiting the operation of an engine if the received ID does not correspond to the registered ID. When the button is pressed for a duration longer than a predetermined length, the second transmitter-receiver circuit of the key transmits the first ID signal in place of the first transmitter-receiver circuit.
43 Citations
27 Claims
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1. An antitheft system comprising:
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a first transmitter for transmitting a first ID signal; a second transmitter for transmitting the first ID signal; a first receiver for receiving the first ID signal transmitted from one of the first and second transmitters; and a first checker for checking whether the first ID signal received by the first receiver corresponds to a first registered signal, wherein the first transmitter comprises a first memory for storing the first ID signal, and transmits the first ID signal stored in the first memory, the second transmitter comprises a second memory for storing the first ID signal, and transmits the first ID signal stored in the second memory, and the second transmitter further comprises a control section for transmitting a second ID signal in a first control mode, for storing the first ID signal into the second memory in a second control mode, and for transmitting the first ID signal stored in the second memory in a third control mode. - View Dependent Claims (2, 3, 7)
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4. An antitheft system for a vehicle, comprising:
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a key comprising a first transmitter for transmitting a first ID signal, and a second transmitter for transmitting a second ID signal and the first ID signal; and a first receiver for receiving the first ID signal transmitted from one of the first and second transmitters of the key; a first checker, mounted on the vehicle, for comparing the first ID signal received by the first receiver with a first registered signal; an immobilizing controller for controlling an engine of the vehicle in dependence on a result of comparison by the first checker; a second receiver for receiving the second ID signal; a second checker for comparing the second ID signal received by the second receiver with a second registered signal; and a keyless entry controller for enabling a door lock in response to an agreement signal from the second checker indicating an agreement between the second ID signal and the second registered signal. - View Dependent Claims (5, 6, 8, 9)
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10. An antitheft system, comprising:
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a key comprising a first transmitter for transmitting a first ID signal, and a second transmitter for transmitting a second ID signal and the first ID signal; a first receiver for receiving the first ID signal transmitted from one of the first and second transmitters of the key; a first checker, mounted on the vehicle, for comparing the first ID signal received by the first receiver with a first registered signal; and an immobilizing controller for controlling an engine of the vehicle in dependence on a result of comparison by the first checker, wherein the key includes a manually operated device, a timer for measuring an operation time of the manually operated device, and the second transmitter transmits the first ID signal when the time measured by the timer is equal to or longer than a predetermined time length.
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11. An antitheft system, comprising:
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a key comprising a first transmitter for transmitting a first ID signal, and a second transmitter for transmitting a second ID signal and the first ID signal; a first receiver for receiving the first ID signal transmitted from one of the first and second transmitters of the key; a first checker, mounted on the vehicle, for comparing the first ID signal received by the first receiver with a first registered signal; and an immobilizing controller for controlling an engine of the vehicle in dependence on a result of comparison by the first checker, wherein the first transmitter comprises a first memory for storing the first ID signal, and a first control section for reading the first ID signal from the first memory and transmitting the first ID signal, the second transmitter comprises a second memory for storing the first ID signal and a second control section for reading the first ID signal from the second memory and transmitting the first ID signal the a key comprises a manual device, the second transmitter of the key transmits a second ID signal in response to a manual operation of the manual device of the key and thereafter transmits the first ID signal, and the antitheft system further comprises a second receiver for receiving the second ID signal, a second checker for comparing the second ID signal received by the second receiver with a second registered signal, and a keyless entry controller for enabling a door lock in response to an agreement signal from the second checker indicating an agreement between the second ID signal and the second registered signal. - View Dependent Claims (12, 13, 14, 15)
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16. A key for a vehicle equipped with an antitheft system, the key comprising:
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a first transmitter for transmitting a first ID signal to the vehicle for performing a first function in the vehicle; and a second transmitter for transmitting a second ID signal to the vehicle for performing a second function in the vehicle, different from the first function, when the second transmitter is in a normal mode, said second transmitter further transmitting the first ID signal in lieu of the first transmitter when the second transmitter is in a fail safe mode. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A key for a vehicle equipped with an antitheft system, the key comprising:
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a first transmitter for transmitting a first ID signal; a second transmitter for transmitting; a manual device, wherein, when the manual device is operated, the second transmitter transmits a second ID signal, and thereafter transmits the first ID signal; and a timer for measuring an operation time of the manual device, wherein the second transmitter transmits the second ID signal when the time measured by the timer is shorter than a predetermined time length, and transmits the first ID signal when the time measured by the timer is equal to or longer than the predetermined time length. - View Dependent Claims (23, 24)
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25. An antitheft process comprising the steps of:
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transmitting a first ID signal with a first transmitter; transmitting a second ID signal with a second transmitter when a condition discrimination signal is in a first signal state, and transmitting the first ID signal instead of the second ID signal with the second transmitter when the condition discrimination signal is in a second signal state; receiving the first ID signal transmitted from one of the first and second transmitters; comparing the first ID signal received by the receiving step with a first registered signal; and rendering an engine operable when the first ID signal received by the receiving step is in agreement with the registered signal.
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26. An antitheft process comprising the steps of:
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transmitting a first ID signal with a first transmitter; transmitting the first ID signal with a second transmitter; receiving the first ID signal transmitted from one of the first and second transmitters; comparing the first ID signal received by the receiving step with a first registered signal; rendering an engine operable when the first ID signal received by the receiving step is in agreement with the registered signal; and measuring an operation time of a manual device provided in a key, wherein the first ID signal is transmitted when the operation time is equal to or longer than a predetermined time length and the second ID signal is transmitted when the operation time is shorter than the predetermined time length. - View Dependent Claims (27)
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Specification