A remote entry system for a vehicle includes a portable transmitter and a vehicle-mounted receiver. The receiver alternates between a monitoring state lasting for a monitoring period and a sleep state lasting for a sleep period. A remote control is manually activated and a message sequence is transmitted to the receiver in response to the manual activation for initiating a function of the remote entry system. The message sequence comprises a plurality of blocks transmitted at a predetermined block interval, the blocks including a preamble block and at least one message block. If the receiver detects the preamble block then it enters a reception state for detecting the message block. The preamble block has a predetermined preamble length and is comprised of a plurality of bytes separated by respective off intervals between successive bytes. Each off interval comprises a predetermined off period greater than the predetermined byte period. The predetermined off period is less than the monitoring period and the monitoring period is less than or equal to the predetermined off period plus substantially twice the predetermined byte period.

Remote entry system with increased transmit power and reduced quiescent current

The system comprises a transceiver unit which transmits wide band modulated radar signals and receives corresponding echo signals. A code transmitter (30) modulates the received signals using a surface acoustic wave (SAW) element (35,36,37). The latter is comprised of both fixed and variable modulating reflectors. The code transmitter resends the modulated signals as echo signals.

Identification system, esp. for vehicle

Die Erfindung bezieht sich auf ein Fahrzeugsicherungssystem mit einer Zugangskontrolleinrichtung, die ein oder mehrere, nutzerseitig mitfuhrbare, handhabungsfreie Authentikationselemente (1), einen fahrzeugseitigen Zugangssteuerteil (2), einen drahtlosen Zugangsberechtigungs-Kommunikationskanal (4) fur Zugangsberechtigungsprufvorgange und ein benutzeransprechbares Ausloseelement (6) zur Anforderung der Erzeugung eines sichernden oder entsichernden Zugangskontrollsignals fur wenigstens ein Fahrzeugschlieselement (7) umfast, wobei der Zugangssteuerteil (2) auf eine solche Anforderung hin einen Zugangsberechtigungsprufvorgang auslost und dieser nur dann erfolgreich durchgefuhrt wird, wenn sich das jeweilige Authentikationselement (1) im vorgegebenen Wirkbereich dieses Kommunikationskanals befindet. Erfindungsgemas sind Authentikationselement-Lokalisierungsmittel zur Feststellung vorgesehen, ob sich bei Auslosung eines zugangsberechtigungsprufenden Kommunikationsvorgangs ein Authentikationselement fahrzeugausenseitig im Wirkbereich des Kommunikationskanals befindet. Wenigstens ein Teil der moglichen, sichernden oder entsichernden Zugangskontrollsignale wird dann in Abhanigkeit davon erzeugt, ob ein gultiges Authentikationselement fahrzeugausenseitig festgestellt wird. Verwendung beispielsweise fur Automobile.

Fahrzeugsicherungssystem mit Keyless-Go-Funktionalität

Described is a vehicle key (5) for wireless communication with a vehicle (1). Said vehicle key (5) comprises a radio transmitter (7) for transmitting radio signals to the vehicle (1). In order to be able to locate the vehicle (1) within a close range, the vehicle key (5) further comprises a radio receiver (6) and/or an acoustic receiver (6), bidirectional communication with a transceiver (2) of the vehicle (1) being enabled by means of the radio receiver (6) and/or the acoustic receiver (6) and the radio transmitter (5). A corresponding method for locating the vehicle (1) with the help of the vehicle key (5) is also described.

Vehicle key, and method for locating a motor vehicle within a close range with the help of a vehicle key

The system has an access controller with authentication element(s) (1) carried by the user, a vehicle mounted access control part (2,7) and a wireless access authorization communications channel (4). It also has an authentication element location arrangement for determining whether an authorized authentication element is outside the vehicle within the working range of the communications channel, when an access authentication checking communications process is initiated. The control part generates at least part of the control signal depending on whether the location arrangement detects the presence of an authorized authentication element in this region.

Vehicle security system with a keyless access module

The system has a vehicle-sided transmission device (2) for sending coded transmission signals with respect to a motor vehicle (1). A receiver comprising an electronic key (4) is provided for receiving and decoding the signals. An evaluation device evaluates determined information about the orientation of the key and the vehicle, and provides direction information about a current position of the key for a current position of the vehicle. An independent claim is also included for a method for localization of a motor vehicle.

Motor vehicle localization system for use in parking garages, has evaluation device evaluating information about orientation of key and vehicle, and providing direction information of current position of key for current position of vehicle

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

The theft alarm system has an intermittently-operated theft warning device activated when the automobile is broken into, with the receiver for the centralised locking system switched from periodic operation into a permanently supplied operating mode, upon activation of the warning device. The receiver is used to receive coded signals (4) from a hand-held transmitter, for controlling the centralised locking system and for cut-out of the theft warning device.

Theft alarm system for automobile

The arrangement has a tracking module (3) located in a vehicle (1), and two coded identifications (7, 8) stored in the tracking module and a module (4), respectively. The module or the tracking module is formed to examine validity of the two coded identifications received from the tracking module and/or the module by comparing the two coded identifications with other coded identification stored in the module and/or tracking module and to prevent execution of vehicle functions when examination of validity of the identifications indicates an invalid identification.

Arrangement for control of vehicle functions, has module or tracking module formed to prevent execution of vehicle functions when examination of validity of identification indicates invalid identification

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