SCHLÜSSELLOSE ZUGANGSKONTROLLEINRICHTUNG FÜR KRAFTFAHRZEUGE SOWIE VERFAHREN ZUM DURCHFÜHREN EINER SCHLÜSSELLOSEN ZUGANGSBERECHTIGUNGSKONTROLLE BEI KRAFTFAHRZEUG

摘要

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.