Method for operating an anti-theft system for a motor vehicle and an anti-theft system
AssigneeSiemens Aktiengesellschaft
InventorAurel Papp
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Abstract
A method for operating an anti-theft system having a transceiver unit comprising a trigger unit and a portable code generator, comprises the steps of: emitting a request signal by the transceiver unit upon activation of the trigger unit, and emitting a response code signal by the code generator after reception of the request signal, wherein the request signal and the response code signal overlap for a predefined time period.
Claims20
A method for operating an anti-theft system for a motor vehicle, the anti-theft system having:
- a transceiver unit in the motor vehicle which, when triggered, emits a request signal, compares a received response signal with a reference code signal, and, when they at least largely correspondend, transmits an enable signal to a security assembly, and
- a portable code generator which, after reception of a request signal, emits a response code signal, as a result of which authorization of the code generator is confirmed, wherein
- both the transceiver unit and the code generator emit their signals modulated at the same carrier frequency, and wherein
- the transmission periods of the request signal and of the response signal overlap with respect to time.
A method for operating an anti-theft system having a transceiver unit comprising a trigger unit and a portable code generator, the method comprising the steps of:
- emitting a request signal by the transceiver unit upon activation of the trigger unit,
- emitting a response code signal by the code generator after reception of the request signal, wherein the request signal and the response code signal overlap for a predefined time period.
An anti-theft system for a motor vehicle having a transceiver unit in the motor vehicle, which, when triggered, emits a request signal, then waits for a response code signal and compares the code information item contained in the received response code signal with a predefined reference code information item, and when the two information items at least largely correspond, transmits an enable signal to a security assembly, and a portable code generator, which, after reception of a request signal, emits a response code signal which has a code information item which is characteristic of the code generator, characterized in that the transceiver unit has a signal generator which controls the request signal with respect to time in such a way that it at least partially overlaps with respect to time with the response code signal.
An anti-theft system comprising:
- a transceiver unit comprising a trigger unit and a first transmitter for emitting a request signal upon activation of the trigger unit,
- a portable code generator comprising a second transmitter for emitting a response code signal after reception of the request signal in such a way that the request signal and the response code signal overlap for a predefined time period.
Dependencies are inferred from the claim text.