Method of making secure a hands-free access and/or starting system for a motor vehicle
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United States of America Patent
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-
Mar 16, 2004
Grant Date -
Mar 21, 2002
app pub date -
Sep 5, 2001
filing date -
Sep 5, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
The method of making secure a hands-free access and/or starting system for a motor vehicle, the hands-free system a control unit (2) placed in the vehicle and a portable identifier (1) suitable for communicating remotely and cordlessly with the control unit in order to be authenticated, the method consists in recording (30) a first data item in the identifier by communicating with the control unit in response to detecting starting of the vehicle engine, and in recording (60) a second data item to replace the first data item in the identifier by communicating with the control unit in response to detecting normal stopping of the vehicle engine. In the case of lending of the vehicle, the borrower of the vehicle must return an identifier containing the second data item in order to prove that he left the vehicle in an authorized manner.
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