Transponder for remote keyless entry systems
First Claim
1. A road vehicle keyless entry system comprising an in-vehicle communication processor and a remote, miniaturized transponder;
- the communication processor having a radio frequency receiver, a low frequency transmitter/receiver for transmitting low frequency signals and a controller for reading the signals sent and received by the low frequency transmitter/receiver; and
the transponder having a radio frequency transmitter that transmits a signal to the radio frequency receiver of said communication processor upon receipt of a manual stimulus thereat and a low frequency transmitter/receiver for reading low frequency signals received from the communication processor and transmitting an encrypted response to the communication processor.
2 Assignments
0 Petitions
Accused Products
Abstract
A road vehicle keyless entry system (10) having an in-vehicle communication processor (11) and a remote transponder (15) is provided. The communication processor (10) has a radio frequency receiver (12), a low frequency transmitter/receiver (13) and a controller (14) capable of encrypting and reading the signals sent and received by the low frequency transmitter/receiver (13). The transponder (15) has a radio frequency transmitter (16) that transmits a signal to the communication processor (11) upon receipt of a manual stimulus and a low frequency transmitter/receiver (17) capable of reading and responding to encrypted signals received from the communication processor (11).
330 Citations
23 Claims
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1. A road vehicle keyless entry system comprising an in-vehicle communication processor and a remote, miniaturized transponder;
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the communication processor having a radio frequency receiver, a low frequency transmitter/receiver for transmitting low frequency signals and a controller for reading the signals sent and received by the low frequency transmitter/receiver; and
the transponder having a radio frequency transmitter that transmits a signal to the radio frequency receiver of said communication processor upon receipt of a manual stimulus thereat and a low frequency transmitter/receiver for reading low frequency signals received from the communication processor and transmitting an encrypted response to the communication processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A road vehicle keyless entry system comprising an in-vehicle communication processor and a remote transponder;
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the communication processor having a radio frequency receiver, a low frequency transmitter/receiver and a controller capable of reading the signals sent and received by the low frequency transmitter/receiver; and
the transponder having a radio frequency transmitter that transmits a signal to the radio frequency receiver of said communication processor upon receipt of a manual stimulus, a low frequency transmitter/receiver capable of reading signals received from the communication processor and transmitting an encrypted response to the communication processor and an interface circuit and coupling coil to provide contactless transfer of data between the radio frequency transmitter and the low frequency transmitter/receiver. - View Dependent Claims (10, 11, 12, 13)
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- 14. A secure road vehicle keyless entry system comprising an in-vehicle communication processor and a remote transponder, the communication processor and transponder communicating in parallel paths, a first path being a radio frequency transmission from the transponder to the communication processor and a second path being a low frequency, encrypted two way transmission between the transponder and the communication processor.
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17. A method of vehicle keyless entry comprising the steps of:
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providing an in-vehicle communication processor and a remote, miniaturized transponder, the communication processor having a radio frequency receiver, a low frequency transmitter/receiver for transmitting low frequency signals and a controller for reading the signals sent and received by the low frequency transmitter/receiver and the transponder having a radio frequency transmitter that transmits a signal to the communication processor upon receipt of a manual stimulus thereat and a low frequency transmitter/receiver for reading low frequency signals received from the communication processor and transmitting an encrypted response to the communication processor;
providing said manual stimulus to cause said transponder to send an RF signal to said communication processor and sending a low frequency signal to said low frequency transmitter/receiver at said communication processor in response to said manual stimulus;
then sending a low frequency signal from said low frequency transmitter/receiver at said communication processor to said transmitter/receiver at said transponder in response to at least one of said signals from said transponder to said communication processor; and
then sending a signal from said transponder to said communication processor in response to said signal from said communication processor to said transponder. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification