Keyless access control device for motor vehicles and method for carrying out a keyless access authorization control in motor vehicles

US6714119B1 · kind B1 · utility

Assignee

• Leopold KOSTAL GmbH & Co. KG · DE

Inventors

• Anton Mindl · Hildesheim, DE
• Detlef Kerkmann · Altena, DE

Key dates

• Filing date: Jun 7, 2001
• Grant date: Mar 30, 2004
• Expiry date: Jun 7, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T70/7068
• WIPO field: Control
• WIPO sector: Instruments

Abstract

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.