EP 2242027 A3 20111221 - Method for securing keyless entry communication for motor vehicles
Title (en)
Method for securing keyless entry communication for motor vehicles
Title (de)
Verfahren zur Sicherung einer Keyless-Entry-Kommunikation für Kraftfahrzeuge
Title (fr)
Procédé de sécurisation d'une communication d'entrée sans clé pour véhicules automobiles
Publication
Application
Priority
DE 102009002448 A 20090416
Abstract (en)
[origin: EP2242027A2] The method involves controlling an oscillating circuit to generate an activation radio signal such that oscillation rise time (T1) is varied depending on randomly generated parameter. A power supply of the circuit is controlled depending on the parameter, and an expected system run time is determined depending on the parameter. Duration from activation of the circuit till receiving of a release signal in a control unit is measured, and the duration is compared with the expected time. A locking system is not released when the duration varies from the expected time above a preset value.
IPC 8 full level
G07C 9/00 (2006.01)
CPC (source: EP US)
G07C 9/00309 (2013.01 - EP US); G07C 2009/00365 (2013.01 - EP US); G07C 2009/00555 (2013.01 - EP US); G07C 2209/08 (2013.01 - EP US)
Citation (search report)
- [A] DE 19802526 A1 19990729 - BOSCH GMBH ROBERT [DE]
- [A] DE 10255880 A1 20040609 - PHILIPS INTELLECTUAL PROPERTY [DE]
- [A] EP 1246137 A1 20021002 - SIEMENS AG [DE]
- [A] EP 1271420 A2 20030102 - ALPS ELECTRIC CO LTD [JP]
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated extension state (EPC)
AL BA ME RS
DOCDB simple family (publication)
EP 2242027 A2 20101020; EP 2242027 A3 20111221; CN 101866537 A 20101020; DE 102009002448 A1 20101021; US 2010265035 A1 20101021
DOCDB simple family (application)
EP 10158623 A 20100331; CN 201010163817 A 20100416; DE 102009002448 A 20090416; US 76133210 A 20100415