Verfahren zum Betrieb eines Schließsystems für verschließbare Gegenstände

摘要

A key module (10) carried by the user of the vehicle has a pushbutton connecting the enclosed battery to a high frequency radio transmitter and antenna having a range of about 10 m. It also contains a transponder with a range of a few centimetres and an inductive loop for reception of a check signal (23) at e.g. 125 kHz returned by the transmitter (32) in a lock module within the vehicle. The encoded signal (21) from the key module is verified (33) and a control unit (34) performs the opening or locking operation.