Access control device for a motor vehicle and method for setting the sensitivity of an access control device
AssigneeSiemens Aktiengesellschaft
InventorThomas Röhrl
Life of this patent
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Abstract
An access control device for a motor vehicle and a method for setting the sensitivity of an access control device, include a plurality of ferrite antennas disposed in a door handle of the motor vehicle. The individual ferrite antennas are inclined with respect to one another and with respect to the door surface. Consequently, a widely fanned magnetic field is produced within which a request signal can readily be received by a portable encoder. In order to ensure that interference signals have only little effect on the reception of a request signal, the reception sensitivity of the encoder is increased only after a very powerful advance signal has been received.
Claims11
In a motor vehicle having at least one door with a door surface, at least one door handle, and at least one locking unit, an access control device for the motor vehicle, comprising:
- a transmitting and receiving unit disposed at the vehicle for transmitting a request signal and for receiving a reply signal;
- an evaluation unit in said transmitting and receiving unit for comparing the reply signal with an expected code signal and for controlling the at least one locking unit in dependence on a result of the comparison;
- a portable encoder for receiving the request signal, for returning a coded reply signal, and for demonstrating authorization of a user carrying the encoder to lock and unlock at least one locking unit;
- and
- a transmitting and receiving antenna connected to said transmitting and receiving unit, said antenna having cores and at least two coils each wound onto a respective one of said cores, said coils disposed in at least one door handle at a distance from the door and at an inclination relative to the door surface and relative to one another.
Dependencies are inferred from the claim text.