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Apparatus for protecting motor vehicle against unauthorized operation

  • US 5,973,411 A
  • Filed: 09/26/1996
  • Issued: 10/26/1999
  • Est. Priority Date: 02/15/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for protecting a motor vehicle against unauthorized operation thereof, comprising:

  • code reading means for reading out an identification code stored in an engine key upon every starting of operation of said motor vehicle, said code reading means being provided in association with means for receiving said engine key;

    identification code decision means for collating said identification code read out from said engine key with a preset identification code to thereby make decision as to whether or not both of said identification codes coincide with each other;

    rolling code adding means responsive to coincidence between both of said identification codes for thereby adding or affixing to said identification code as read out a rolling code updated every time the internal combustion engine of said motor vehicle is operated, to thereby generate engine start enabling signal;

    engine start enabling signal sending means for sending said engine start enabling signal;

    rolling code generating means for executing an arithmetic process to attendantly generate said rolling code for generating said rolling code which is updated every time said engine is operated;

    rolling code sending means for sending said rolling code generated to said rolling code adding means;

    engine start enabling signal receiving means for receiving said engine start enabling signal;

    identification code decision means for making decision as to coincidence between the identification code contained in the engine start enabling signal as received and said preset identification code; and

    rolling code decision means responsive to coincidence of the identification codes for thereby collating the rolling code contained in said engine start enabling signal with the rolling code generated by said rolling code generating means, to thereby output said engine start enabling signal to engine starting means upon detection of coincidence between said rolling codes.

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