Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle diagnosis or maintenance indication
Patent
1996-05-09
1999-04-27
Nguyen, Tan Q.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle diagnosis or maintenance indication
701 32, 701 34, 307 102, 307 106, 340426, 34082534, 3408255, H04L 932, B60R 2504
Patent
active
058975985
ABSTRACT:
A portable transponder, such as key, first sends invalid data to a lock, whereupon a challenge signal with a memory address is transmitted back to the transponder. A code word stored in memory at the memory address in the transponder is read out and transmitted to the lock. There, the code word is compared with a desired code word. If they correspond, an immobilizer is released. Next, the address and/or code word is recalculated in the lock and adjusted in the transponder for the next release cycle. An alternating code is thus created.
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Greenberg Laurence A.
Lerner Herbert L.
Nguyen Tan Q.
Siemens Aktiengesellschaft
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