Method Of Operating Multiple Vehicles Using Any Transmitter From A Programmed Group
First Claim
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1. A method of transmitting data for a remote keyless entry system comprising the steps of:
- a) generating an encrypted signal utilizing a secret code, a transmitter identification code; and
a variable value indicative of a current state of a transmitter;
b) transmitting the encrypted signal for receipt by a vehicle controller with non-encrypted data including the transmitter identification code and the variable value indicative of a current state of the transmitter;
c) receiving both the encrypted signal and the non-encrypted data with the vehicle controller;
d) replicating the encrypted signal at the vehicle controller;
e) comparing the replicated encrypted signal to the received encrypted signal; and
f) initiating a vehicle operation responsive to the received encrypted signal comparing to the replicated encrypted signal within a desired acceptance criteria.
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Abstract
A method for sending and receiving transmissions for a remote keyless entry and immobilizer facilitates operation of multiple transmitters with multiple vehicles. A common secret key code stored in each transmitter and vehicle controller of the system is utilized to encrypt and decrypt information and data transmitted from the transmitter to the vehicle.
23 Citations
18 Claims
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1. A method of transmitting data for a remote keyless entry system comprising the steps of:
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a) generating an encrypted signal utilizing a secret code, a transmitter identification code; and
a variable value indicative of a current state of a transmitter;b) transmitting the encrypted signal for receipt by a vehicle controller with non-encrypted data including the transmitter identification code and the variable value indicative of a current state of the transmitter; c) receiving both the encrypted signal and the non-encrypted data with the vehicle controller; d) replicating the encrypted signal at the vehicle controller; e) comparing the replicated encrypted signal to the received encrypted signal; and f) initiating a vehicle operation responsive to the received encrypted signal comparing to the replicated encrypted signal within a desired acceptance criteria. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of authorizing operation of many vehicles with a single transmitter comprising the steps of:
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a) storing a secret code value in at least one transmitter and each of a plurality of vehicle controllers of a corresponding plurality of vehicles; b) generating an encrypted signal responsive to actuation of the at least one transmitter, wherein the encrypted signal is generated utilizing the secret code, command data indicative of a desired vehicle operation, and a rolling count incremented each time a button of the transmitter is depressed; c)transmitting the encrypted signal and a non-encrypted signal to one of the plurality of vehicle controllers, wherein the non-encrypted signal includes the rolling count, and the command data; d) creating a generated encrypted signal in the vehicle controller utilizing the stored secret code and the received non-encrypted signal to replicate the received encrypted signal; and e) comparing the generated encrypted signal with the received encrypted signal and authorizing the desired operation responsive to the comparison fulfilling a desired criteria. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A keyless entry and start system comprising:
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a plurality of vehicles including vehicle controllers; and a plurality of transmitters for communicating with each of the plurality of vehicles, wherein each of the plurality of transmitters transmits an authorization transmission verifiable by each of the plurality of vehicles such that each of the plurality of transmitters facilitates operation of each of the plurality of vehicles. - View Dependent Claims (15, 16, 17, 18)
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Specification