EP 0265728 A3 19890201 - ELECTRONIC REMOTE CONTROL DEVICE FOR THE CENTRAL LOCKING SYSTEMS OF MOTOR VEHICLES
Title (en)
ELECTRONIC REMOTE CONTROL DEVICE FOR THE CENTRAL LOCKING SYSTEMS OF MOTOR VEHICLES
Publication
Application
Priority
DE 3636822 A 19861029
Abstract (en)
[origin: US4847614A] The electronic remote control means operates according to the known principle of code stepping through which a different code word is used after each transmitting/receiving operation. In accordance with the invention the respective new code word is produced anew by linking according to a given function, starting from a stored original code word and the previous code word. In case of non-agreement between the code word received and the new code word determined at the receiver additional code words are produced in sequence at the receiver. Thereafter, if no agreement results, the receiver switches over to an increased security mode wherein two successive code words in sequence must be successfully compared.
IPC 1-7
IPC 8 full level
G07C 9/00 (2006.01)
CPC (source: EP US)
G07C 9/00182 (2013.01 - EP US); G07C 2009/0023 (2013.01 - EP US); G07C 2009/00253 (2013.01 - EP US); G07C 2009/00769 (2013.01 - EP US)
Citation (search report)
- [X] EP 0171323 A1 19860212 - LEWINER JACQUES [FR], et al
- [A] GB 1595796 A 19810819 - PUSHMAN HUGH JOHN [GB]
- [A] EP 0098437 A2 19840118 - HUELSBECK & FUERST [DE]
- [XP] EP 0219060 A2 19870422 - BAYERISCHE MOTOREN WERKE AG [DE]
Designated contracting state (EPC)
DE ES FR GB IT SE
DOCDB simple family (publication)
DE 3636822 C1 19871015; DE 3636822 C2 19931223; EP 0265728 A2 19880504; EP 0265728 A3 19890201; US 4847614 A 19890711
DOCDB simple family (application)
DE 3636822 A 19861029; EP 87114656 A 19871007; US 10163587 A 19870928