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Process for controlling the use of a motor vehicle using a two part code signal

  • US 5,811,885 A
  • Filed: 03/31/1995
  • Issued: 09/22/1998
  • Est. Priority Date: 03/31/1994
  • Status: Expired due to Term
First Claim
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1. A process for controlling use of a motor vehicle using a code signal having two parts, said code signal being contained in a code memory carried by a user and being transmitted to a code control unit contained in the motor vehicle which reads the code signal, a correspondence between this code signal and a reference code signal operating to release the use of the motor vehicle, the process comprising the steps of:

  • transmitting an inquiry with said code control unit located in the motor vehicle to access an access control device for allowing access to the code memory;

    comparing in the code control unit a first partial code signal read from said code memory with a reference partial code signal in the code control unit; and

    making a second partial code signal separately stored in said code memory accessible for a subsequent reading operation only if the first partial code signal read from the code memory corresponds to the reference partial code signal; and

    releasing the use of the motor vehicle if the second partial code signal corresponds with a corresponding reference partial code signal.

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