A system for freehand unlocking and / or opening of the opening devices of a motor vehicle

摘要

A boot-lid (C) carries two horizontally separated antennae (5a,5b) which, when an e.g. ultrasonic proximity sensor (7) detects an approaching person, emit short-range (under 1m) non-overlapping interrogatory signals. A boot-mounted supervisory unit (2) controls the associated emitter/receivers (6a,6b). The user's uniquely coded transponder (4), requiring no internal power source, is embodied in e.g. a bracelet or cuff-link. To unlock, he/she places it in both emitted fields sequentially, e.g. left-right-left, briefly pausing at each transfer. Each data exchange is confirmed by a corresponding indicator lamp (8), both lamps lighting on successful completion. Any error or excessive delay requires the program to be repeated. Alternative manual operation is provided. The system is applicable also to vehicle doors and anti-theft immobilisers.