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Central locking installation for a motor vehicle

  • US 5,508,692 A
  • Filed: 07/29/1994
  • Issued: 04/16/1996
  • Est. Priority Date: 04/06/1990
  • Status: Expired due to Term
First Claim
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1. A remote lock apparatus for a motor vehicle having at least one lock, comprising:

  • a controller mounted to the vehicle for receiving a control pulse and connected to said lock for causing locking or unlocking of the lock;

    a receiver mounted to the vehicle;

    a remote actuating device having a transmitter;

    means for switching said receiver from an operating mode to an initializing mode;

    said transmitter transmitting a code word and a transmitter recognition signal to said receiver upon actuation of said transmitter;

    said receiver transmitting said control pulse to said controller which cause the locking or unlocking of the lock;

    said transmitter containing a random number generator producing said transmitter recognition signal during said initializing mode, and a transmitter store in which said transmitter recognition signal is stored, and a means for producing a supply of code words using a randomly modified mathematical formation law;

    said receiver containing a memory and a receiver control circuit for comparing said transmitter recognition signal, during said initializing mode with preexisting transmitter recognition signals that are already stored within the memory, said control circuit automatically storing said transmitter recognition signal received from the transmitter as a legitimate transmitter recognition signal in said receiver memory only if not already so stored, and upon storing said transmitter recognition signal, said control circuit generating a new supply of code words, corresponding to said supply of code words produced by said means for producing a supply of code words at said transmitter, said new supply of code words assigned to said legitimate transmitter recognition signal; and

    during said operating mode said receiver control circuit receives said legitimate transmitter recognition signal and the code word from said transmitter and if said transmitter recognition signal is already stored as a legitimate transmitter recognition signal said receiver control circuit compares the code word to a next expected code word from said new supply of code words assigned to said legitimate transmitter recognition signal and if correspondence exists, said receiver transmits said control pulse.

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