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

  • US 7,227,448 B2
  • Filed: 06/20/2001
  • Issued: 06/05/2007
  • Est. Priority Date: 11/04/1999
  • Status: Expired due to Fees
First Claim
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1. A system for controlling locking/unlocking means of at least one openable panel of a vehicle, comprising:

  • vehicle transmission/reception means (3, 4, 5) carried by the vehicle, comprisingvehicle memory means (7) comprising a vehicle circular shift register in which is stored a pseudo-random code;

    vehicle transmission means (3, 6, 7) for transmitting an interrogation signal which carries the pseudo-random code; and

    vehicle de-spreading means (6, 7, 8) for de-spreading a response signal received unless a pseudo-random code carried by the response signal is not synchronized in substantial correlation with a corresponding pseudo-random code stored in the vehicle memory means (7) by a time shift less than required for an intermediate transmission means to intercept and retransmit a response signal, and for verifying whether the received signal carries a signature of a user transmission means; and

    user transmission/reception means (9, 10, 11) intended to be carried by a user for transmitting the response signal for controlling unlocking actuation of the operable panel, comprisinguser memory means comprising a user circular shift register (13) in which is stored the pseudo-random code;

    user de-spreading means (12, 13, 14) for de-spreading the transmission signal received unless the pseudo-random code carried by the interrogation signal is not synchronized in substantial correlation with a corresponding pseudo-random code stored in the user memory means (13) by a time shift less than required for an intermediate transmission means to intercept and retransmit the interrogation signal; and

    the user transmission means (9, 12, 13, 14) for transmitting the response signal which carries the pseudo-random code and the signature which is specific to the user transmission/reception means.

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