Leopold Kostal Gmbh & Co. Kg

Dirk Wolf

Volker Pretzlaff

Rainer Vens

Paul Vogels

Peter Raab

Michael Fromm

Detlev Kramer

Peter Lunova

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.

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

A keyless security entry control method and system for motor vehicles includes transmitting respective coded signals from at least two transmitters. The transmitted coded signals overlap within the motor vehicle and are separated outside of the motor vehicle. The coded signals are then received from the at least two transmitters with an identification (ID) transmitter. The position of the ID transmitter with respect to the motor vehicle is then determined from the received coded signals. The position of the ID transmitter is determined to be inside of the motor vehicle if the ID transmitter receives at least two coded signals and is determined to be outside of the motor vehicle if the ID transmitter receives only one coded signal. An action signal indicative of an action to be performed is transmitted from a transceiver device. In response to the ID transmitter receiving the action signal it is determined whether the position of the ID transmitter enables the ID transmitter to perform the action. If the position of the ID transmitter enables the ID transmitter to perform the action then a response signal is transmitted from the ID transmitter. The transceiver device then performs the action in response to receiving the response signal. The ID transmitter may then transmit a position signal indicative of the position of the ID transmitter. In response to receiving the position signal the transceiver device performs the action as a function of the position of the ID transmitter. The ID transmitter may be switched to a non operative mode if the position of the ID transmitter disables the ID transmitter from performing the action.

Keyless security entry control method for motor vehicles

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Dortmund, Germany

Dirk Wolf