Method for carrying out a keyless access authorization check and keyless access authorization check device

US6803851B1 · kind B1 · utility

Assignee

• Leopold KOSTAL GmbH & Co. KG · DE

Inventors

• Detlev Kramer · Schwerte, DE
• Volker Pretzlaff · Hagen, DE
• Rainer Vens · Dortmund, DE
• Paul Vogels · Dortmund, DE
• Michael Fromm · Trumbull, US
• Dirk Wolf · Dortmund, DE
• Peter Raab · Hagen, DE

Key dates

• Filing date: Apr 12, 2001
• Grant date: Oct 12, 2004
• Expiry date: Apr 12, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G07C2209/63
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A method and device for checking keyless vehicle access authorization of an operator. The method includes transmitting a code signal from a base station to a mobile identification (ID) transmitter carried by the operator. In response to receiving the code signal, the ID transmitter performs an action which is indicative of a reply signal that is detectable by the base station. The difference of a signal characteristic between a reference code signal monitored at the base station and the reply signal received by the base station is then determined. The signal characteristic correlates with signal propagation time and changes as a function of the distance between the base station and the ID transmitter. The distance between the base station and the ID transmitter is then determined on the basis of a relative determination based on the difference of the signal characteristic between the reference code signal and the reply signal.