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AssigneeDaimlerChrysler AG
InventorsKarl-Heinz Müller, Walter Ulke, Wolfgang Voss, Udo Knepper
Estimating the term…
In a procedure for the provision of access authorization for an engine-driven vehicle, if there is an operator request for the provision of access authorization to an engine-driven vehicle, a bidirectional signal transmission using encoded transmission signals and an electronic key will be effected. From transmission units located on or in the vehicle, vehicle signals will be transmitted to the electronic key, and, from the electronic key, key signals will be returned as echo signals to the respective transmission units. The time difference between the vehicle signal and the key signals will be determined and evaluated. The position of the electronic key in relation to the vehicle will be determined by means of successive bidirectional signal transmissions between at least two transmission units and the electronic key as well as by evaluating the time differences; having determined the actual key position, a decision on access authorization to the vehicle will be made.
Procedure for the provision of access authorization to an engine-driven vehicle (1) where a bidirectional signal transmission by means of encoded transmission signals (FS, SS) between at least two transmission units (21, 22, 23), located in or on the vehicle (1), and an electronic key (2) is effected, with encoded transmission signals (FS, SS) being transmitted as vehicle signals (FS) from the transmission units (21, 22, 23) to the electronic key (2), and key signals (SS) being returned as echo signals from the electronic key (2) to the respective transmission units (21, 22, 23);
Dependencies are inferred from the claim text.