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US 6,211,776 B1Granted
Method for initializing an anti-theft system for a motor vehicle
AssigneeSiemens Aktiengesellschaft
InventorsThomas Röhrl, Manfred Glehr
Life of this patent
Estimating the term…
Abstract
An interrogation signal is emitted via one or more passenger compartment antennas of a motor vehicle. The transmit power of the emitted interrogation signal is changed until a portable transponder just still receives the interrogation signal if the transponder is located at a previously defined, fixed position. The transmit power which is set in this way is stored for the operation of the anti-theft system.
Claims9
A method for initializing an anti-theft system, which comprises:
- a) setting an initial transmit condition;
- b) emitting an interrogation signal via a transceiver unit disposed in a motor vehicle and electrically connected to at least one antenna disposed on the motor vehicle;
- c) receiving the interrogation signal in a portable response transmitter located at a previously defined fixed position and emitting a response signal in response to the interrogation signal;
- d) receiving, evaluating, and comparing the response signal in a control unit of the transceiver unit with setpoint values;
- e) changing the initial transmit condition according to a predefined algorithm in dependence on the response signal received;
- and
- f) repeating steps b)-e) until the portable response transmitter just still receives the interrogation signal or just fails to receive the interrogation signal any more.
4 more elements
An anti-theft system, comprising:
- at least one antenna disposed in a motor vehicle;
- a transceiver unit disposed in the motor vehicle and electrically connected to said at least one antenna, said transceiver unit emitting via said at least one antenna an interrogation signal;
- a portable response transmitter receiving the interrogation signal and responding by emitting a response signal;
- and
- said portable response transmitter just still receives the interrogation signal or just fails to receive the interrogation signal any more;
- said transceiver having a control unit for receiving, evaluating and comparing the response signal with setpoint values, said transceiver also having a transmit memory connected to said control unit for storing predetermined transmit conditions determined during an initialization phase.
3 more elements
Dependencies are inferred from the claim text.