Keyless motor vehicle entry and ignition system
First Claim
1. A method for operating a keyless motor vehicle control system including a remote control for carrying by a user and a control circuit in the motor vehicle, said method comprising the steps of:
- storing seed data in the control circuit;
storing the seed data in the remote control;
programming a first remote control identification into the remote control;
storing the first remote control identification into the control circuit;
in response to activation of the remote control by movement of the user, exchanging challenge data between the control circuit and the remote control;
the control circuit executing an encryption algorithm which uses the seed data and the challenge data to produce a first answer;
the remote control executing the encryption algorithm which uses the seed data and the challenge data to produce a second answer;
the remote control transmitting the second answer to the control circuit;
the control circuit comparing the first and second answers and producing a first indication when a match occurs;
the remote control transmitting the first remote control identification to the control circuit;
determining whether the first remote control identification received from the remote control matches a first remote control identification previously stored in the control circuit and if so producing a second indication; and
in response to presence of both the first and second indications, activating a component of the motor vehicle to perform a defined function.
3 Assignments
0 Petitions
Accused Products
Abstract
A keyless control system is disclosed which may be employed to gain entry to a motor vehicle and start an engine. When using this system, a user activates a remote control by selecting a function for the motor vehicle to perform. In response, a challenge number is exchanged and used in an encryption algorithm by both the remote control and a control circuit in the motor vehicle to produce independently of each other separate algorithm answers. A first verification indication is produced when the control circuit finds both answers to be the same. The remote control also sends its unique remote control identification and a designation of the selected function to the control circuit. If the received remote control identification matches is on an authorized remote control list stored in the control circuit, a second verification indication is produced. When both the first and second verification indications are produced, the control circuit issues a signal that causes the motor vehicle to perform the selected function.
171 Citations
19 Claims
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1. A method for operating a keyless motor vehicle control system including a remote control for carrying by a user and a control circuit in the motor vehicle, said method comprising the steps of:
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storing seed data in the control circuit; storing the seed data in the remote control; programming a first remote control identification into the remote control; storing the first remote control identification into the control circuit; in response to activation of the remote control by movement of the user, exchanging challenge data between the control circuit and the remote control; the control circuit executing an encryption algorithm which uses the seed data and the challenge data to produce a first answer; the remote control executing the encryption algorithm which uses the seed data and the challenge data to produce a second answer; the remote control transmitting the second answer to the control circuit; the control circuit comparing the first and second answers and producing a first indication when a match occurs; the remote control transmitting the first remote control identification to the control circuit; determining whether the first remote control identification received from the remote control matches a first remote control identification previously stored in the control circuit and if so producing a second indication; and in response to presence of both the first and second indications, activating a component of the motor vehicle to perform a defined function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for remotely operating locks of a motor vehicle with a keyless entry system that includes a control circuit in the motor vehicle and a remote control for carrying by a user, said method comprising the steps of:
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storing identical seed data in both the control circuit and the remote control; in response to the user activating the remote control, generating and exchanging challenge data between the control circuit and the remote control; the control circuit executing an encryption algorithm which uses the seed data and the challenge data to produce a first answer; the remote control executing the encryption algorithm which uses the seed data and the challenge data to produce a second answer; the remote control transmitting the second answer to the control circuit; the control circuit comparing the first and second answers and producing a first indication when a match occurs; and in response to the first indication, unlocking a door on the motor vehicle. - View Dependent Claims (13, 15)
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14. A method for remotely operating a motor vehicle with a keyless control system that includes a control circuit in the motor vehicle and a remote control for carrying by a user, said method comprising the steps of:
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the control circuit transmitting an interrogation signal; in response to receiving the interrogation signal, the remote control transmitting an initial signal; the control circuit responding to the initial signal by transmitting challenge data to the remote control; the control circuit executing an encryption algorithm which uses seed data and the challenge data to produce a first answer; the remote control executing the encryption algorithm which uses the seed data and the challenge data to produce a second answer; the remote control transmitting the second answer to the control circuit; the control circuit comparing the first and second answers and producing a first indication when a match occurs; and in response to the first indication, performing a function on the motor vehicle.
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16. A method for operating a keyless motor vehicle control system including a portable remote control on which a user selects a function for the motor vehicle to perform, and including a control circuit in the motor vehicle, said method comprising the steps of:
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storing seed data in the control circuit; storing the seed data in the portable remote control; programming a remote control identification into the portable remote control; storing the remote control identification into the control circuit;
thereafterin response to a user selecting a function on the portable remote control, transmitting an initial signal to the control circuit; the control circuit responding to receiving the initial signal by generating challenge data and transmitting the challenge data to the portable remote control; the control circuit executing an encryption algorithm which uses the seed data and the challenge data to produce a first answer; the portable remote control executing the encryption algorithm which uses the seed data and the challenge data to produce a second answer; the portable remote control transmitting the second answer and the remote control identification to the control circuit; the control circuit comparing the first and second answers and producing a first indication when a match occurs; determining whether the remote control identification received from the portable remote control matches a remote control identification previously stored in the control circuit and if so producing a second indication; and in response to presence of both the first and second indications, producing a control signal for activating the function selected by the user. - View Dependent Claims (17, 18, 19)
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Specification