Anti-theft device using code type transponder

Details Anti-theft device using code type transponder Anti-theft device using code type transponder

1997-10-14

2000-12-12

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

34082531, 34082532, G07D 700

Patent

active

061604887

ABSTRACT:
A method for registering a new key in an anti-theft device allows the registration of a new key having a code type transponder from which authentication data once written cannot be read out or written over. An ECU communicates with a transponder of a registered key such as a master key and allows an engine to be started when the result of a collating function data stored in an EEPROM of the ECU with function data written in the transponder is a match. When function data is to be written into a transponder of an unregistered new key, the ECU first communicates with the transponder of the registered key and, when the result of collation of the function data stored in the EEPROM and the function data written in the transponder of the registered key is a match, writes function data stored in the EEPROM into the transponder of the new key.

REFERENCES:
patent: 5146215 (1992-09-01), Drori
patent: 5621380 (1997-04-01), Mutoh et al.
patent: 5635900 (1997-06-01), Hasegawa et al.
patent: 5640057 (1997-06-01), Hirata et al.
patent: 5745026 (1998-04-01), Kokubu et al.

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