Keyless device for controlling access to automobiles and keyless method for checking access authorization

US6538560B1 · kind B1 · utility

Assignees

• Leopold KOSTAL GmbH & Co. KG · DE
• Anatoli Stobbe · DE

Inventors

• Anatoli Stobbe · Barsinghausen, DE
• Volker Pretzlaff · Hagen, DE

Key dates

• Filing date: Jan 14, 2000
• Grant date: Mar 25, 2003
• Expiry date: Jan 14, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G07C2009/00603
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A keyless vehicle access control system includes a transceiver in a vehicle and a mobile transponder. The transceiver includes transmitters for transmitting respective code signals and a key interrogation signal and is operable for receiving response and crypto-code signals. The transponder is operable for receiving the code and the key interrogation signals and for transmitting response and crypto-code. Upon the transponder receiving a code signal from a respective transmitter the transponder transmits a response signal indicative of the respective transmitter to the transceiver unit. Upon the transponder receiving a interrogation signal from the transceiver unit the transponder transmits a crypto-code signal to the transceiver unit. Upon the transceiver unit receiving a crypto-code signal from the transponder the transceiver checks the crypto-code signal to determine vehicle access authorization of the transponder. The transceiver actuates a vehicle access function associated with the respective transmitter upon determining that the transponder has authorization.