KEYLESS ACCESS CONTROL SYSTEM FOR MOTOR VEHICLES AS WELL AS METHOD FOR CARRYING OUT A KEYLESS ACCESS AUTHORISATION CONTROL IN MOTOR VEHICLES

• Main Authors: KERKMANN, DETLEF, MINDL, ANTON
• Format: Patent
• Language: English; French; German
• Published: 21.11.2001
• Edition: 7
• Subjects: ACCESSORIES THEREFOR; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDEDFOR ELSEWHERE; CHECKING-DEVICES; FIXED CONSTRUCTIONS; GENERATING RANDOM NUMBERS; HANDCUFFS; KEYS; LOCKS; PERFORMING OPERATIONS; PHYSICS; REGISTERING OR INDICATING THE WORKING OF MACHINES; SAFES; TIME OR ATTENDANCE REGISTERS; TRANSPORTING; VEHICLES IN GENERAL; VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR; VOTING OR LOTTERY APPARATUS; WINDOW OR DOOR FITTINGS

A keyless access control device and method for a motor vehicle includes a controller, transceiver, and a mobile transponder. The transceiver transmits a low frequency signal (LF) to the transponder and, in response, the transponder transmits a first high frequency (HF) signal to the transceiver. The controller moves a vehicle door handle into a position in which the door handle can be actuated by a user in response to receipt of the first HF signal by the transponder. The transceiver transmits a second HF signal to the transponder in response to actuation of the door handle by the user. The transponder transmits an encrypted HF signal to the transceiver based on the second HF signal. The transceiver processes the encrypted HF signal to determine whether the user is authorized to enter the vehicle. The controller unlocks the vehicle door in response to the transceiver indicating that the user is authorized.