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US 8,275,511 B2Granted
Cryptology calculation for remote entry devices
AssigneeContinental Automotive Systems US, Inc.
InventorsPatricia Kachouh, Brian Marlett, Jose Luis Herrera Martinez, Mauricio Carrera Manjarrez
Life of this patent
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Abstract
A passive entry and start system includes a controller that calculates the cryptology required for each remote identification device during idle transmission time to reduce overall system actuation time.
Claims20
A passive start and entry system for a motor vehicle comprising:
- a controller including a transmitter to transmit a challenge transmission and a receiver to receive a response to the challenge transmission;
- a plurality of remote control devices to each send a response signal in response to the challenge transmission, wherein the controller is configured to calculate an encrypted signal for each of the plurality of remote control devices after completion of communication with one of the plurality of remote control devices;
- and
- wherein the controller is configured to authorize a vehicle function upon a response by the one of the plurality of remote control devices.
1 more element
A method of operating a passive entry and start system comprising the steps of:
- sending a challenge transmission from a controller within a vehicle to a plurality of identification devices;
- receiving the challenge transmission and sending a response signal back to the controller from each of the plurality of identification devices;
- calculating an encrypted message for each of the plurality of identification devices upon receipt of an encrypted response from a chosen one of the plurality of identification devices;
- choosing one of the plurality of calculated encrypted messages with the controller, wherein the chosen one of the plurality of calculated encrypted messages corresponds with a chosen one of the plurality of identification devices;
- and
- sending the chosen one of the plurality of calculated encrypted messages to the corresponding identification device;
- and
- actuating a vehicle function upon a response by the chosen one of the plurality of identification devices.
5 more elements
Dependencies are inferred from the claim text.