EP 0219060 B1 19920603 - SECURITY DEVICE FOR AN AUTOMOTIVE VEHICLE
Title (en)
SECURITY DEVICE FOR AN AUTOMOTIVE VEHICLE
Publication
Application
Priority
DE 3536378 A 19851011
Abstract (en)
[origin: EP0219060A2] A security device for a motor vehicle, with a portable transmitter for a radio transmitted ode signal and with a receiver in the motor vehicle, possesses essentially the following elements: The transmitter, whenever actuated, varies its code signal in a reproducible way. In the motor vehicle, this code signal is compared with an expected code signal and with a number of code signals following this. These code signals are determined according to the law of formation from the code signal critical for the preceding comparison. If the code signal received does not correspond to one of the code signals from this number of code signals, a second comparison is carried out. For this, a second code signal emitted by the transmitter and hanged according to the law of formation in relation to the first code signal transmitted and one or more code signals are compared with one another. The latter are likewise obtained according to the law of formation from the first code signal received. It is thus possible, even when there is a lack of synchronism between the transmitter and motor vehicle, to make it possible for the authorised user to us the motor vehicle.
IPC 1-7
IPC 8 full level
E05B 49/00 (2006.01); G07C 9/00 (2006.01)
CPC (source: EP)
G07C 9/00182 (2013.01); G07C 2009/00253 (2013.01); G07C 2009/00785 (2013.01); G07C 2209/06 (2013.01)
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
EP 0219060 A2 19870422; EP 0219060 A3 19880824; EP 0219060 B1 19920603; DE 3536378 A1 19870416; DE 3685541 D1 19920709
DOCDB simple family (application)
EP 86113981 A 19861009; DE 3536378 A 19851011; DE 3685541 T 19861009