Code signal generator, in particular for an anti-theft protection system of a motor vehicle
First Claim
Patent Images
1. A code signal generator for triggering a security unit, comprising:
- a transponder unit adapted to receive a question code signal from a stationary transmitting and receiving unit, to generate, in response, a response code signal based on the question code signal, and to transmit the response code signal to the transmitting and receiving unit for authentication, whereby a security unit is enabled upon a successful authentication;
a transmitting unit independent of said transponder unit, said transmitting unit having a switching element, and being adapted to wirelessly transmit a control signal to the stationary transmitting and receiving unit upon actuation by said switching element; and
a single signal generating unit connected to said transmitting unit and to said transponder unit for generating the control signal and the response code signal.
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Abstract
A code signal generator has a transponder unit, which proves its authorization for releasing an immobilizer by means of a question-response dialog. The code signal generator has a remote control unit which transmits control signals for unlocking doors upon the actuation of a pushbutton. Both the transponder unit and the remote control unit have a single encryption unit, which is accessed by both units in order to encrypt the signals to be transmitted.
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Citations
12 Claims
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1. A code signal generator for triggering a security unit, comprising:
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a transponder unit adapted to receive a question code signal from a stationary transmitting and receiving unit, to generate, in response, a response code signal based on the question code signal, and to transmit the response code signal to the transmitting and receiving unit for authentication, whereby a security unit is enabled upon a successful authentication;
a transmitting unit independent of said transponder unit, said transmitting unit having a switching element, and being adapted to wirelessly transmit a control signal to the stationary transmitting and receiving unit upon actuation by said switching element; and
a single signal generating unit connected to said transmitting unit and to said transponder unit for generating the control signal and the response code signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In an anti-theft protection system of a motor vehicle, comprising:
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a transmitting and receiving unit stationary in a motor vehicle;
a code signal generator for triggering a security unit of the anti-theft protection system, said code signal generator including a transponder unit adapted to receive a question code signal from said stationary transmitting and receiving unit, to generate, in response, a response code signal based on the question code signal according to a given algorithm, and to transmit the response code signal to the transmitting and receiving unit for authentication;
a transmitting unit independent of said transponder unit, said transmitting unit having a switching element, and being adapted to wirelessly transmit a control signal to said transmitting and receiving unit upon actuation by said switching element; and
said transmitting and receiving unit having a signal generating unit generating a desired code signal according to the given algorithm, wherein one of the received response code signal and the received control signal are compared with the desired code signal and wherein, if the response code signal or the control signal corresponds with the desired code signal at least to a large extent, an enable signal is generated for controlling a security unit in the motor vehicle.
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Specification