Secure system for the control of the unlocking of at least one openable panel of a motor vehicle

• US 20020163420A1
• Filed: 06/20/2001
• Published: 11/07/2002
• Est. Priority Date: 11/04/1999
• Status: Active Grant

• Current Assignee: Valeo Electronique
• Original Assignee: Valeo Electronique
• Inventors: Smith, Colin, Menard, Eric
• Granted Patent: US 7,227,448 B2
• Time in Patent Office: Days
• US Class Current: 340/5.72
• CPC Class Codes: G07C 2009/00476 dynamically
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: G07C 9/00309 operated with bidirectional data transmission between data carrier and locks

Abstract

The invention concerns a system for controlling means for locking/unlocking at least a vehicle opening panel, in particular a motor vehicle, comprising transmission/reception means on-board the vehicle and transmission/reception means to be carried by the user and which, on receiving an interrogation signal transmitted by the vehicle transmitting/receiving means, are designed to transmit a reply signal capable of actuating the unlocking of the opening panel. The invention is characterised in that the transmission/reception means on-board the vehicle and the user transmission/reception means comprise each storage means forming a cyclic shift register wherein are stored at least a common pseudo-random code, the on-board transmission/reception means comprising means for transmitting an interrogation signal bearing said pseudo-random code, the user transmission/reception means comprising means for despreading the received signal if the pseudo-random code borne by said signal is synchronised with a corresponding pseudo-random code stored in the storage means and further comprising means for transmitting a reply signal bearing a pseudo-random code and which further bears a signature which is specific to said user transmission/reception means, the on-board transmission/reception means comprising means for despreading the received signal if the pseudo-random code is synchronised with a corresponding pseudo-random code stored in their storage means and for verifying whether the received signal bears the signature of the user transmission/reception means.

Claims

1. System for the control of means for locking/unlocking at least one openable panel of a vehicle, in particular an automobile, comprising transmission/reception means (3, 4, 5) and memory means (7) which are carried by the vehicle and transmission/reception means (9, 10, 11) and memory means (13) which are intended to be carried by a user, the transmission/reception means of the vehicle (3, 4, 5) forming a circular shift register in which is stored a pseudo-random code and comprising means (3, 6, 7) for transmitting an interrogation signal which carries such a pseudo-random code, the transmission/reception means of the user (9, 10, 11) comprising means (12, 13, 14) for de-spreading the signal received if the pseudo-random code carried by the said signal is synchronized with a corresponding pseudo-random code stored in their memory means (13) and being intended to transmit a response signal able to control the actuation of the unlocking of the openable panel,

characterized in that

the memory means (13) and the transmission/reception means (9, 10, 11) of the user form a circular shift register and furthermore comprise means (9, 12, 13, 14) for transmitting a signal in response which signal carries a pseudo-random code and a signature which is specific to the said transmission/reception means (9, 10, 11) of the user, the transmission/reception means (3, 4, 5) on the vehicle comprising means (6, 7, 8) for de-spreading the signal received if the pseudo-random code carried by the said response signal is synchronized with a corresponding pseudo-random code stored in their memory means (7) and for verifying whether the signal received carries the signature of the transmission means.

2. System according to claim 1, characterized in that the interrogation signal transmitted by the transmission/reception means of the vehicle (3, 4, 5) comprises a key code, the response signal transmitted by the transmission/reception means (9, 10, 11) of the user comprising a secret code determined by the said transmission/reception means of the user as a function of the said key code.

3. System according to claim 2, characterized in that the transmission/reception means (3, 4, 5) of the vehicle comprise means (8) for mixing the said key code with the pseudo-random code within the interrogation signal.

4. System according to claim 2, characterized in that the transmission/reception means (9, 10, 11) of the user comprise means (13) for mixing the said secret code with the pseudo-random code within the response signal.

5. System according to claim 2, characterized in that the key code and/or the secret code constitutes (constitute) the pseudo-random code of the interrogation signal or response signal.

6. System according to claim 1, characterized in that the signature of the transmission/reception means (9, 10, 11) of the user consists of the pseudo-random code of the response signal.

7. System according to one of the preceding claims, characterized in that it comprises means for synchronizing the various memory means, prior to the transmission of the interrogation signal.

8. System according to claim 7, characterized in that the transmission/reception means (3, 4, 5) of the vehicle comprise means for self-synchronizing with a pseudo-random code transmitted by the transmission/reception means of the user upon their activation.

9. System according to claim 8, characterized in that this pseudo-random code is a shorter code than the pseudo-random code or codes used by the transmission/reception means of the vehicle and of the user after synchronization.

10. System according to claim 9, characterized in that the pseudo-random code or codes used by the transmission/reception means of the vehicle and of the user after synchronization are 127-bit codes.

11. System according to one of the preceding claims, characterized in that the interrogation signals and response signals are RF signals modulated by a two-phase NRZ modulation.