EP 0215291 B1 19910227 - ELECTRONIC LOCKING DEVICE FOR MOTOR VEHICLES
Title (en)
ELECTRONIC LOCKING DEVICE FOR MOTOR VEHICLES
Publication
Application
Priority
- DE 3532156 A 19850910
- DE 3616197 A 19860514
Abstract (en)
[origin: US4723121A] A simple and economical, yet tamper-proof, electronic locking apparatus for motor vehicles features an electronic key and an electronic lock, which each contain a synchronized, constantly operating, precision oscillator. The output of each oscillator is applied at a predetermined counting rate to a respective number sequence generator. Both generators contain the same predetermined number sequence, which they step through at the same clock rate, applying the instantaneous value of the count to a first input of a respective computer. A second input of each computer is connected to a fixed memory which supplies a permanent, characteristic code number to the computer. Both the count state and the characteristic code number are combined using corresponding algorithms in the key and in the lock to produce a combination code. The key-produced combination code is sent from a transmitter in the key to a receiver in the lock and compared there with the lock-produced combination code. In the event of a successful comparison, a control pulse is generated, which actuates various positioning means in the lock.
IPC 1-7
IPC 8 full level
E05B 49/00 (2006.01); G07C 9/00 (2006.01)
CPC (source: EP US)
G07C 9/00182 (2013.01 - EP US); G07C 2009/00253 (2013.01 - EP US); G07C 2009/00769 (2013.01 - EP US); G07C 2009/00785 (2013.01 - EP US); G07C 2209/06 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0215291 A1 19870325; EP 0215291 B1 19910227; DE 3677676 D1 19910404; US 4723121 A 19880202
DOCDB simple family (application)
EP 86111113 A 19860812; DE 3677676 T 19860812; US 90567886 A 19860909