Communications: electrical – Continuously variable indicating – With meter reading
Patent
1996-03-29
1998-11-24
Horabik, Michael
Communications: electrical
Continuously variable indicating
With meter reading
34082534, 34082569, 34082572, 70278, 180287, 361171, 361172, H06F 700
Patent
active
058413634
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a locking system, particularly for an automobile, including an operating key, an operating key receptacle, an operating unit and means for transmitting coded operating signals located in the operating key and the operating key receptacle for activating the operating unit upon a successful deciphering of the coded operating signals.
Locking systems of this type serve as a safety measure against the unauthorized operation of devices equipped with them. When the locking system is actuated by a user, the authorization of the latter is checked and only the presence of the correct authorization affords the precondition for the intended use of the device. In particular on automobiles, such locking systems are employed as an ignition lock for an associated operating unit and/or for locking and unlocking the doors.
German Offenlungsschrift 3,436,761 discloses a locking system for an automobile which comprises an operating key, an operating key receptacle and connecting lines from an associated operating unit. An operating signal transmitter having an operating signal encoder is arranged in the operating key and an operating signal receiver having an operating signal decoder is arranged in the operating key receptacle. A coded operating signal can be transmitted from the operating signal transmitter to the operating signal receiver, the activation of the operating unit being carried out after the successful decoding of this operating signal in the operating signal decoder.
It has emerged that a locking system of this type is not theft-proof. By listening to and/or copying the operating signal transmitted by the operating key, it is possible to make a substitute key. By means of this substitute key, activation of the operating unit and consequently theft of the automobile are then possible.
In order to function, the operating key requires an energy source, which may be exhausted after a particular period of service. In such an instance, the operating key is no longer operational. Activation of the operating unit then cannot take place.
FR-A-2 674 895 describes a locking system for the doors of an automobile which operates by means of radio waves for data transmission. Located in the door of the automobile is a first transmitter/receiver with an antenna. Located in the grip of an associated key is an antenna with a second transmitter/receiver. A first code is transmitted from the first transmitter to the second receiver in the key. Energy is obtained from this signal for supplying the key and the first code is evaluated. Subsequently, a second code is transmitted from the second transmitter to the first receiver in the door of the automobile and is evaluated there. In the case of positive evaluation, the central locking system in the door of the automobile is actuated.
In the case of this locking system, there in turn takes place a bidirectional code transmission with simultaneous transmission of energy to the key for its operation. The range of problems already mentioned also occur here. Further locking or security systems which operate by means of a bidirectional data transmission for exchanging the codes are described in GB-A-2 051 442 and DE-U-93 07 176. However, a transmission of energy for the operation of the key is not shown there.
EP-A-0 307 749 in turn discloses a data transmission device which can be used as a locking system, having two optical transmitting/receiving units, in which device data are bidirectionally transmitted optically. After successful dialogue of the data transmission, the locking system is actuated. In the first transmitting/receiving unit there is additionally arranged a light transmitter for the transmission of light energy and in the second transmitting/receiving unit there is arranged a light receiver for converting the light energy into electrical energy. There is further located in the second transmitting/receiving unit a store for the electrical energy, for example a capacitor, so that the second transmitting/receiving unit is
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Jakob Marquardt
Mueller Karl
Beaulieu Yonel
Horabik Michael
Marquardt GmbH
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