Method and devices for use in a centralized wireless network are provided. The centralized wireless network employs a wireless communication protocol to communicate with various devices throughout the network. In addition to communication, the protocol may be used to control and monitor various aspects of the devices throughout the network.

Centralized wireless network for multi-room large properties

A tire characteristic monitoring method allows automatic programming of tire position information in a remote tire pressure monitoring system (10). The method includes, from a remotely located exciter (16) using a primary coil (18) to transmit a relatively low frequency signal to a secondary coil (L1) of a tire monitor (12) associated with a tire of a vehicle. The method further includes the step of, at the tire monitor, in response to the relatively low frequency signal, transmitting a relatively high transmitting signal to convey data. The data are received at the exciter and subsequently loaded into a receiving unit (14) of the vehicle.

Method and apparatus for a remote tire pressure monitoring system

The invention relates to a locking system (3), in particular for an operation-independent access or driving authorisation in the form of a keyless entry/starter function and/or for the operation-dependent access or driving authorisation for a motor vehicle (1). The locking system (3) comprises a first device (4), which is configured as a control unit and has two states, in addition to a control unit for unlocking and/or locking the vehicle doors (6), the ignition lock, the steering lock and for releasing and/or locking the immobiliser, the motor control unit or similar. The system also comprises a corresponding second device (5), configured as an electronic key, an ID emitter, a chip card or similar. For operating purposes, the two devices (4, 5) comprise means for transmitting and/or receiving signals. At least one of the signals (7) transmitted between the second device (5) and the first device (4) is a coded operating signal for authenticating said second device (5) in such a way that once the transmitted operating signal has been positively identified for the authorised second device (5), the state of the first device can be modified (4). Prior to its initial operation, the second device (5) lies in a dormant state with a reduced energy consumption, preventing operation-independent functions. The second device (5) is converted from said dormant state into a standby state, in which at least some operation-independent functions are permitted, during the first user-dependent authentication in the form of an initial authentication.

Locking system, in particular for a motor vehicle

A remote communication device, that receives temperature indicia concerning a container and/or its contents and communicates such temperature indicia along with an identification indicia to a reader. The remote communication device can measure and communicate temperature indicia associated with a container in a periodic manner. The remote communication device can also measure and communicate temperature indicia associated with a container when such temperature indicia exceed a certain minimum or maximum threshold temperature. The remote communication device can also include power circuitry to store energy when energized in the range of an interrogation reader so that the remote communication device can be powered for temperature indicia measurements when not in the range of an interrogation reader.

RFID temperature device and method

A method and a system of data transmission between a terminal for generating an electromagnetic field and a transponder, the terminal and the transponder each including an oscillating circuit forming an antenna, and the transponder including an electronic circuit adapted to absorbing and giving back power provided by the terminal field, the oscillating circuits of the transponder and of the terminal being capable of transmitting radio-electric signals of determined frequency, this method including causing a detuning of at least one of the oscillating circuits with respect to the determined frequency when the transponder and the terminal are very close to each other.

Operation in very close coupling of an electromagnetic transponder system

An anti-theft system for a motor vehicle includes a transceiver disposed in a motor vehicle and a portable transponder. If a magnetic alternating field of the transceiver is turned on, energy signals are transmitted inductively to the transponder, where they charge an energy storing device. As soon as the alternating field is turned off, a transponder oscillating circuit oscillates at its resonant frequency. This oscillation is transmitted inductively back to the transceiver. In the process, the resonant frequency is measured. Then, the exciter frequency of the alternating field is adapted to the resonant frequency of the transponder, so that the inductive energy transmission is as effective as possible in subsequent charging operations.

Anti-theft system for a motor vehicle

An anti-theft system has a portable transponder (2) which carries code information. A stationary oscillating circuit (1, 11, 12) is modulated with the code information if the transponder (2) is located in the vicinity of the oscillating circuit. A demodulator (31) filters the code information out of the modulated oscillation and relays it to an evaluation unit (3) where it is compared with desired code information. Upon correspondence, an immobilizer (34) is released. With system-immanent zero positions which are caused by component tolerances and temperature changes, no desired code information is initially demodulated despite the transponder (2) operating correctly. In this case the oscillating circuit (1, 11, 12) is detuned in accordance with the invention in order to obtain the desired code information. This is achieved by changing the excitation frequency (fE) or the resonant frequency (fR) of the oscillating circuit.

Anti-theft system for automobile

The circuit has a terminal connection (3), for connection to the actuator terminal and by which the control stage is provided with a voltage, and a control terminal (12) for connection to the control port (10) and by which, in a special case, a low level is applied by the microprocessor (11) to the control stage Depending on the voltage levels at the terminal connection and the control terminal, a control signal is emitted to the actuator (6) which is amplified by a driver stage (5) The control stage has a transistor (T1), the input of which is connected via a voltage divider (7) to the terminal connection and to the control terminal of the control stage The voltage divider is designed so that in normal operation, with the application of a terminal voltage to the actuator terminal, the occurring voltage level at the control terminal is recognized by the microprocessor as high level and the transistor switches through A decoupling diode (D1) is connected in the flow direction between the terminal connection and the voltage divider The terminal connection is connected to earth by way of a discharge resistor and the driver stage is connected by way of a diagnostic line to a diagnostic port (16) of the microprocessor An Independent claim is included for a method for maintaining the instantaneous state of an actuator, controlled by a microprocessor, during a dip in the supply voltage

Buffer circuit for connection between control port of microprocessor and actuator in a motor vehicle includes control stage and drive stage with control signal determined by voltage at terminal connection and control terminal

The system contains a portable transmitter (1) which transmits code information modulated by a carrier frequency and a receiver (2) in the vehicle which receives the code information, compares it with desired code information and generates a release signal if they coincide. The release signal activates/deactivates an immobiliser, opens/closes door locks and windows, and arms/disarms an alarm/warning device. The receiver has a first input stage (7) which demodulates the code signal from the fundamental oscillation of the received signal, and at least a second input stage (11) which demodulates the code signal from at least one harmonic of the received signal. The receiver has an evaluation unit in which a single code information set is formed by logically combining (19) the demodulated information.

Motor vehicle theft protection system

A process is disclosed for checking the voltage supply of battery-operated electronic equipment provided with a microprocessor, in particular the hand emitter of a remote controlled vehicle closing system The constant voltage applied to a light-emitting diode (LED) or the like which acts as a pilot lamp is used as auxiliary reference voltage, based on which the battery voltage is compared with a predetermined threshold value in order to determine if the voltage supply is sufficient or not, or the absolute value of the battery voltage is calculated

Battery supply testing for esp. electronic hand-held remote control for vehicle locking system

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