Siemens Aktiengesellschaft

Thomas R&ouml;hrl

Manfred Glehr

Wolfgang Piesch

Peter Gold

Thomas Kirchlinde

A remote-controlled access control device includes a stationary transceiver device with a triggering device and a portable transponder. The stationary transceiver device transmits an interrogation code signal in response to the triggering device being activated. The portable transponder receives the interrogation code signal and has a manually activatable activation element. The portable transponder generates a code signal and transmits, together with the code signal, information indicating whether the code signal is generated in response to the interrogation code signal or in response to the activation element being activated. The stationary transceiver device receives the information together with the code signal and generates an unlocking signal based on an evaluation of the code signal with the information indicating whether the code signal is generated in response to the interrogation code signal or in response to the activation element being activated.

Remote-controlled access control device, in particular for a motor vehicle, and portable transponder which is configured for it

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.

Access control device for a motor vehicle and method for setting the sensitivity of an access control device

A control system for controlling an object function includes a base station and a portable code transmitter. The base station is at the object and has a transceiver unit for transmitting an interrogation signal. The code transmitter emits a response signal with a code information item in response thereto. The base station checks an authorization of the code information item contained in the response signal. The base station and/or the code transmitter determines a time period between a transmission of a part of the interrogation signal and a reception of a part thereof obtained in reaction thereto, and compares the time period with a predefined reference time period. The base station enables the object-specific function only if the measured time period is shorter than the reference time period even if the code information item of the response signal is correct. There is also provided an access control and driver authorization device for a motor vehicle where the base station transmits the interrogation signal to the code transmitter from which checkbits are transmitted back directly to the motor vehicle, bypassing an evaluation unit. The base station measures the time period between the checkbits being emitted and received back and only accepts a response signal of the code transmitter if the measured time period is shorter than a reference time period. There is also provided a method for controlling at least one function of the object.

Control system and method for controlling at least one function of an object and access control and driving authorization device for a motor vehicle

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.

Growing community of inventors

Barbing, Germany

Thomas Röhrl

Growing community of inventors

Barbing, Germany

Thomas R&ouml;hrl

Thomas Röhrl