Mercedes-benz Group Ag

Konrad Betz

Matthias Reinhardt

Özgür Mutlu

Marco Leicht

A method for determining the position of a mobile electronic identification device relative to a motor vehicle that can be unlocked by the identification device is provided. In a step a) at least one signal is transmitted from the motor vehicle to the identification device via the first communication connection, the signal containing the transmission time of the at least one signal. In a step b) the transmission time and reception time of the at least one signal received by the identification device is stored in the identification device. In a step c) a data packet is transmitted from the identification device to the motor vehicle via the second communication connection, said data packet containing the stored transmission and reception times of the signals transmitted in step a).

Method for ascertaining a current distance between a motor vehicle and a mobile electronic identification device

A method for authorizing access to a motor vehicle involves monitoring a decrease in the signal strength of the second communication connection, while the identification transmitter is moved away from the motor vehicle, such that the spacing between the motor vehicle and the identification transmitter increase. The current signal strength of the second communication connection is stored as a reference value as soon as the first communication connection between the motor vehicle and the identification transmitter is deactivated/interrupted. The first communication connection is reactivated as soon as the signal strength of the second communication connection exceeds the stored reference value due to the decreasing spacing between the motor vehicle and identification transmitter when the identification transmitter is moved towards the motor vehicle again.

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Stuttgart, Germany

Konrad Betz