Remote control system for motor vehicle related devices
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Feb 24, 1997
filing date -
Feb 24, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system and method for operating a remote control having a portable remote control unit which can control at least one function unit. The remote control unit and the function unit are connected with one another by way of a bidirectional data communication link, by which data can be transmitted by means of a symmetrical coding method. The remote control unit sends a learn mode reporting signal in a secret coding information learn mode to the controllable function unit which, in the learn mode, in turn, sends back an acknowledgment signal. Upon receipt of the acknowledgment signal, the remote control unit generates new secret coding information by means of the coding algorithm, as a function of basis secret coding information and of the previous secret coding information, and sends the new secret coding information to the function unit. The function unit then replaces the previous secret coding information with the new secret coding information and emits an acknowledgment signal, upon the receipt of which the remote control unit, in turn, replaces the previous secret coding information with the new secret coding information.
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