Abstract: A method, apparatus, and computer program are provided for remotely controlling the ignition of a vehicle. A variety of conditions can be placed on the vehicle for operation, such as time or geography, from a variety of remote wireless technologies. The ignition control system is also capable of effectively learning safe zones under which the vehicle can operate. Also, the ignition control system can cease operations upon request by an owner or law enforcement.

Abstract: A control system for vehicle devices uses an access control device to specify an identification datum, which is used by a control module to modify operation of a set of vehicle devices and functions of such devices. The control module can either disable access to the set of devices or modify operations of the vehicle devices by limiting the functionality of the selected vehicle devices. A valet using a valet key can drive the car under restrictions and a selected set of vehicle devices can be disabled during a valet's use of the vehicle.

Abstract: A lock controller for automatically unlocking and locking a lockable part such as a vehicle door uses a detector for detecting a hand approaching inside a plurality of detection areas. Such a detector is not only arranged to transmit electromagnetic waves and to receive the reflected waves from a target object of detection such as a person's hand but also provided with a plurality of wave detection circuit parts for mixing wave detection signals corresponding to said transmission waves with signals received by said reception antenna at different sampling timings and outputting the mixed signals. A plurality of judging circuit parts each correspond to different one of the wave detection circuit parts and serve to switch on a detection output based on the outputted signals from said wave detection circuit parts to indicate that said target object is approaching and at a speed within a specified range.

Abstract: An automatic vehicle theft prevention system (52) selectively enables an ignition system (22) of a vehicle (20). The system (52) includes an interrogator circuit (54) that generates and radiates an excitation signal (68). A transponder circuit (56) in close proximity to the interrogator circuit (54), and separate from an ignition key (48) of the ignition system (22), detects the excitation signal (68) and modulates the excitation signal (68) to produce the return signal (74) containing an identification code (76) for the transponder circuit (56). The return signal (74) is radiated from the transponder circuit (56) and received at the interrogator circuit (54). When a controller (58), in communication with the interrogator (54), detects the identification code (76) in the return signal (74), the controller (58) actuates a relay (60) to an enable mode to enable the ignition system (22).

Abstract: A steering wheel locking apparatus having high reliability. A steering lock apparatus (1) includes a lock pin (21) engaged with a steering wheel (5), a motor (23) for moving the lock pin, and an ECU (31) for controlling the motor. A switch (61) is arranged in a first power supply line (81) for supplying the motor with current. When supplying an electrical component with current, the switch breaks the first power supply line.

Abstract: A passive entry system for a vehicle of a particular model communicates with a portable fob that may be located in either an interior and an exterior of the vehicle. An internal antenna is disposed in the interior and an external antenna is disposed in the exterior. At least one amplifier drives at least one of the antennas and has a configurable gain. A controller is coupled to the amplifier for transferring at least one of internal and external software-configured gain values to the amplifier for controlling a transmission power of interrogation signals broadcast by the internal and external antennas, respectively. The software-configured gain values are obtained in an advance calibration procedure with respect to the particular model of the vehicle.

Abstract: When a door sensor is touched, a vehicle-mounted unit and a portable unit performs mutual communications for authentication, and the doors are unlocked. When the door sensor is touched without intending to unlock the doors, wasteful consumption of electric energy is avoided which would otherwise result from mutual communications for authentication triggered by a request signal. When the door sensor may possibly be operated not for the purpose of unlocking the doors, e.g., when a CPU detects the doors as being already unlocked from a signal outputted from a door lock knob switch, a request signal is inhibited from being transmitted from the vehicle-mounted unit to the portable unit.

Abstract: An engine control apparatus includes: a stop switch body 6; a stop switch knob 3; a lock plate 5; a transponder 9 that is provided at the lock plate side and that can transmit a predetermined ID code; and a control section 11 that can receive the ID code transmitted from the transponder 9 and that controls based on the ID code the engine operation of the small motorboat. The engine control apparatus is structured such that, when the lock plate 5 is disengaged from the stop switch knob 3, the stop switch body 6 is activated to allow the engine to stop or to be in an idling state. The engine control apparatus also includes the writing section 16 for writing a regular ID code of a transponder to another transponder.

Abstract: A vehicle remote control system includes a remote transmitter to be carried by a user for selectively transmitting signals, and a controller for receiving the signals. The controller includes outputs and is switchable between first and second output operating states. In the first output operating state, the controller operates a first output based upon a first occurrence of receiving a first signal from the remote transmitter, and operates a second output based upon a second occurrence of receiving the first signal from the remote transmitter within a predetermined time of the first occurrence thereof.

Abstract: A remote control system for precisely identifying a distance from the vehicle to an entry key and favorably controlling a vehicle-mounted device such as a door corresponding to the distance. The system comprises a transmitter transmitting different types of response demand signals within a predetermined communication area outside the vehicle, a vehicle mounted receiver for receiving a response signal released from a portable transmitter/receiver in response to the reception of the response demand signal, a controller controlling the vehicle mounted device corresponding to the reception of the response signal by the vehicle mounted receiver. Locking and/or unlocking door(s) of the vehicle are controlled on the basis of whether or not the receiver receives the response signal to a response demand signal other than one having the largest communication area.

Abstract: A system and method described for tracking portable devices. The system may include a transmitter which transmits wireless inquiries to a plurality of portable devices and a receiver receiving replies to the inquiries from the portable devices. In addition, the system may include a memory storing identifier data corresponding to the portable devices and a processor coupled to the memory and to the receiver, the processor retrieving from each reply, identifier data uniquely identifying a particular one of the portable devices which generated the reply and comparing the identifier data to the stored identifier data. Furthermore, the system may include an alarm system coupled to the processor and controlled based on the comparison of stored identifier data to the identifier data retrieved from the replies.

Abstract: A method for the authentication of a transceiver unit with respect to a second transceiver unit, located at a distance to it. A first signal is transmitted via an aerial connected to the first unit, when second unit is located within the reception area of the first unit. The first signal is received by means of the second unit via an aerial connected to it, whereby, on the basis of the first signal received, a value is measured that characterizes the strength of the electro-magnetic field generated by the first signal at the location of the second unit. A second signal is transmitted via the aerial connected to the second unit that contains information relating to the magnitude characterizing the field strength; and the second signal is received via the aerial connected to the first unit, where, on the basis of the second signal received, a value is measured that characterizes the strength of the electro-magnetic field generated by the second signal at the location of the first unit.

Abstract: A sensor electrode which detects an approach of a person to a vehicle can be housed in a door handle body for vehicle and is prevented from giving an adverse influence to transmission signals outputted from a transmission antenna. Slits are formed in a bottom portion of the body. The sensor electrode covered with a resin mold is pushed into the inside of the slit.

Abstract: A key opening apparatus includes an antenna which receives a first signal of slower transmission speed and a second signal of higher transmission speed, a receiving section, a filter, a comparator, and a decoder, and another set of filter, comparator and decoder. The receiving section receives and processes the first and second signals in common, and the two decoders process the signals using one microprocessor before outputting the result to an output terminal.

Abstract: A vending machine uses a field-programmable electronic lock that has a learning process activation device accessible only when the door of the vending machine is in the open position. Using the learning process activation device, a service person activates the electronic lock to perform a key code learning operation, in which the electronic lock receives a key code transmitted from an electronic key and stores the key code in a non-volatile memory for future access control of the vending machine. Data encryption is employed in the communications between the key and the lock to ensure the security of the communications. A communication device installed in the vending machine for communicating with a home base computer allows the operation of the electronic lock to be remotely controlled for access control and auditing purposes.

Abstract: A receiver assembly (16) includes an amplitude shift keyed mode (52) and a frequency shift keyed mode (58) selectively engagable to receive radio frequency transmissions from the tire monitoring system (26) and a remote keyless entry system (20) and switches between modes in response to receipt of a wake up pattern.

Abstract: A system for monitoring conditions within a tire (12) including a sensor assembly (14) including a pressure sensor (36), an accelerometer (34), a temperature sensor (32), and a transmitter (40) to transmit signals indicative of current tire conditions. A remote transmitter (22) for actuating a remote keyless entry system (19) emits a signal to actuate a function of the keyless entry system (19) such as unlocking doors (20) of the motor vehicle (10). A receiver assembly (16) includes an amplitude shift keyed receiver (52) and a frequency shift keyed receiver (58) selectively engagable to receive radio frequency transmissions from the tire monitoring system or the remote keyless entry system (19).

Abstract: A device controller is provided which allows a vehicle occupant to confirm a device to be operated without looking an operation section. When a controller of a microswitch indicates a device such as a window regulator or a sun roof, a control circuit feeds a motion confirmation signal to a corresponding device such as a right-hand front door ECU and a roof ECU. A door glass, a sliding roof or the like then reciprocate slightly (i.e., in an amount that is enough for the vehicle occupant to visually confirm the reciprocation) via a window regulator driving circuit, a sun roof driving circuit or the like. The vehicle occupant can thereby confirm a device to be operated by the operation section without looking an operation section.

Abstract: An on-vehicle apparatus communicates with an electronic key by wireless communication. The one-vehicle apparatus decides to unlock a vehicular door according to an identification result between first ID of the electronic key and unlock-operation ID of the on-vehicle apparatus, and decides to start an engine of the vehicle according to an identification result between second ID of the electronic key and engine-starting ID of the on-vehicle apparatus. The on-vehicle apparatus commands the electronic key to output third ID shorter in data length than the second ID, when the first ID corresponds with the unlock-operation ID. The on-vehicle apparatus permits starting the engine when the third ID corresponds with compacted data of the engine-starting ID.

Abstract: The present disclosure relates to an access/return system with which a user can be permitted to temporarily use a resource. In particular, the system can be used for receiving user identity information with an identity confirmation device of the resource, confirming the identity of the user with a security device of the resource, providing the user with access to the resource, monitoring and recording information about use of the resource with a monitoring system of the resource, reacquiring the resource from the user, and obtaining resource use information from the resource monitoring system of the resource.

Abstract: Apparatus (10) and a method for rendering a weapon (12) incapable of use unless authorized by a specified individual. More than one person may be authorized to use the weapon, however only one person may be authorized to use it at any one time. Each authorized person carries a badge (14) or other device which includes an rf transmitter (TAU) capable of transmitting a coded signal to a receiver (REU) installed in the weapon in response to a coded query from a unit (EU) installed in the weapon. If a properly coded transmission is received by the weapon, it becomes capable of being fired by the person who authorized its use. However, the weapon will not fire unless the person using the weapon is also standing behind the weapon. This prevents the weapon from being turned on the person authorized to use it. The apparatus stores details of the weapon's use (e.g., who, when, and where). This information is released upon receipt of an authorized code.

Abstract: A security system for control access of multiple users to a selected area combines rotating electronic security code or equivalent technology with an automatic self-learning receiver. The first transmitter is “learned” by the receiver manually, but subsequent transmitters are learned without the need for actuating the conventional “manual learn” mode of the receiver. Instead, by simply sending the transmit signal twice within a fixed time period, users of the subsequent transmitters use “self-learning” circuitry (interposed between conventional transmitter and receiver technology) in a way that is relatively transparent to the user. Other aspects of conventional systems are provided, such as separate control via computer or otherwise of an authorized list of uniquely-identified transmitters. In alternative embodiments, even the first transmitter/controller can be programmed into the receiver (such as at the time of manufacturing or installing the system).

Abstract: In a bi-directional contactless data transmission, a procedure aims to prevent the communication distance from being extended by unauthorized persons using radio repeaters. The procedure involves establishing a fixed relationship of a selected physical parameter of an electromagnetic signal. For example, the frequency of the signal received by a transponder is multiplied with a number to provide a different frequency, and a response signal having this different frequency is transmitted back to a base unit. In the base unit, the received frequency of this response signal is divided by the same number and the result is compared to the frequency of the originally emitted signal. If the resulting difference is below a preset threshold, then there is a fixed frequency relationship between the two signals, the process concludes that there has been no unauthorized extension of the communication distance by using repeaters, and the further authentication is carried out.

Abstract: To improve the degree of freedom in attachment of an ignition switch apparatus, and to make the ignition switch apparatus less likely to be influenced by heat from an engine and by electrical noise interference, an ignition switch apparatus is provided including an antenna which performs radio communication for authentication with a transponder built in a key. The ignition switch is operatively attached to a pivot plate of the vehicle frame, on which a rear wheel is supported. In order to assure good communication with the key, the antenna is situated such that it projects from an outer face of a recessed portion of the pivot plate.

Abstract: The system has a uniform system architecture that is designed for an access authorization request both with and without the use of a transponder. Should a transponder be used, only a corresponding transponder must be fitted in the key that can interact with an immobilizer coil specially provided for this in a receiving unit of the motor vehicle. In this case, the corresponding system requirements have also already been taken into consideration in the system architecture. As a result, the different system requirements for access and right of use systems to a great extent provide flexibility.

Abstract: The vehicle port control system has a capaciflective sensor, a port, a lock securing the port, and a control unit. The capaciflective sensor senses the presence of objects a predetermined distance from the vehicle port. The sensor communicates its readings to the control unit, which controls the actuation of the lock.

Abstract: A vehicle door lock system has a lock mechanism for locking or unlocking the vehicle door. A control mechanism for controlling an operation of the lock mechanism includes first and second resonators. The first resonator resonates at a predetermined first value Q for transmitting a first signal to the outside of the vehicle. The second resonator is connected in series with the first resonator and resonates at a second value Q which is greater than the first value Q, and changing a resonant condition in accordance with a change of a capacitance. A single actuator is provided for actuating the first and second resonators. A switching mechanism is provided which utilizes the actuator for alternatively switching actuation between the first and the second resonators. The control mechanism controls the switching operation of the switching mechanism and the operation of the door lock mechanism in accordance with the resonant condition of the second resonator.

Abstract: A motor vehicle door lock system with at least one vehicle lock, an outside door handle assigned to the vehicle lock, and at least one sensor assigned to the outside door handle, where the system is adapted to detect the approach of the hand of an operator to the outside door handle and/or touching and/or activating of the outside door handle. In one embodiment of motor vehicle door lock system, the activation of the outside handle by the hand of an operator or the approach to the outside door handle is recognized early. A vibration generator is assigned to the outside door handle such that the outside door handle or a part thereof is mechanically vibrated. A sensor is provided for acquiring the vibration, the sound waves caused by the vibration and/or their reflections so that the motor vehicle door lock system can detect when the outside door handle or a part thereof is being approached and/or touched and/or activated by the hand of an operator.

Abstract: An ID code is wirelessly sent to a device, such as a keyless-entry system or a keyless-starter system mounted on an automobile, from a portable transmitter. Electronic components including an electronic circuit board, a transponder and a battery are all contained in a resin case. The resin case is composed of a front case and a rear case, both firmly connected to each other. The case cannot be opened to take away the transponder contained therein without breaking the case. If the case is forcibly opened, a trace showing such a fact is unavoidably left on the case. The battery contained in the case, however, can be replaced or unloaded without breaking the case through an opening formed exclusively for the battery.

Abstract: A communication device comprises: a portable transmitter which comprises operation switches, an ID code storage unit, a control unit and a transmission unit; and a receiver which comprises a receiving unit, a reference code storage unit, a control unit and a control signal generating unit capable of generating a plurality of control signals, the portable transmitter transmitting an information signal containing an ID code, the receiver comparing the ID code contained in the received information signal with a reference code, and the control signal generating unit outputting a control signal when these codes coincide with each other, wherein the portable transmitter comprises ID registration mode setting means, an ID code corresponding to the operation is formed and registered in the ID code storage unit when the control unit is set to an ID registration mode and the operation switch is operated multiple times within a predetermined ID registration mode time, and a test ID code common to a plurality of portable

Abstract: A remote control system for precisely identifying a distance from the vehicle to an entry key and favorably controlling a vehicle-mounted device such as a door corresponding to the distance. The system comprises a transmitter transmitting different types of response demand signals within a predetermined communication area outside the vehicle, a vehicle mounted receiver for receiving a response signal released from a portable transmitter/receiver in response to the reception of the response demand signal, a controller controlling the vehicle mounted device corresponding to the reception of the response signal by the vehicle mounted receiver. Locking and/or unlocking door(s) of the vehicle are controlled on the basis of whether or not the receiver receives the response signal to a response demand signal other than one having the largest communication area.

Abstract: A keylock switch and a keylock switch system receive a supply of power from two terminals of the keylock switch, and output key data, affording a small and reasonably-priced keylock switch and keylock switch system, of a drastically expanded field of application of the keylock switch, and improved security in various fields. A keylock switch and a keylock switch system moreover can maintain the function of a conventional lock utilizing metal material. A signal read by read means may be isolated from a power, or a power source, stored in charge storing means to realize both supplying of power and outputting of key data through two terminals. Further, the state inside the keylock switches may be quickly reset to an initial state, to prepare for a next use.

Abstract: A closing device for a vehicle door lock is actuated by a hand lever. The lock can be switched between a secured, inoperative position of the hand lever and an operative position in which the lock can be opened by the hand lever. An electric control device arranged within the vehicle effects via an antenna of a vehicle-correlated transmission and reception unit a data request directed to a data carrier external to the vehicle held by a vehicle user. The data carrier has a transmission and reception unit transmitting a data reply via the antenna of the vehicle-correlated transmission and reception unit to the control device which, for a positive identification of the data carrier, triggers securing, respectively, release of the lock. The antenna of the transmission and reception unit is arranged in the hand lever in addition to at least some further components of the transmission and reception unit.

Abstract: A security system for a motor vehicle opening leaf is provided. The security system includes a lock for maintaining an opening leaf in a closed position, a handle for operating the lock having a pivotal mobile member for grasping and a fixed support, and an interrogation device. The interrogation device triggers interrogation for authorization to permit movement of the bodywork panel between the closed position and an open position. The interrogation device includes an antenna and first and second switches built into the handle for activating an unlocking interrogation (Id) and a locking interrogation (Iv) by movement of the pivotal mobile member of the handle relative to the fixed support without requiring other mechanical actuation.

Abstract: A remote door controlling apparatus with a welcome function automatically locking and unlocking the door(s) of a vehicle depending on the distance between the vehicle and a portable transmitter/receiver. The portable transmitter/receiver has a manual control signal transmitting function for selectively locking and unlocking the door(s) of the vehicle and the manual control is carried out with a priority over the automatic control according to the welcome function within a predetermined period of time.

Abstract: A vehicle-mounted device communication controller includes a vehicle-mounted unit for communicating with ID-registered portable units, a switch-detection mechanism for detecting pressing of an operation knob, a switch-operation restriction mechanism for restricting the rotation of the knob, and a door-opening/closure detection mechanism for detecting opening and closure of a door. Signals are exchanged between the vehicle-mounted unit and each portable unit, and a portable unit having succeeded in exchanging the signals is authenticated and released from the restriction. The vehicle-mounted unit includes a sending/receiving part, a controller, an authentication part, and an ID-storage part.

Abstract: An anti-theft device for a motorcycle includes an anti-theft locking mechanism, a remote control, a receiver that receives a locking release signal transmitted from the remote control, a controller that releases locking by the locking mechanism according to the locking release signal, and a locking release mechanism that unlocks the locking mechanism by manual operation of a dedicated key. The locking release mechanism is normally covered with a cover member of the motorcycle such that it is not easily detected by unauthorized persons.

Abstract: An anti-theft device for a motorcycle having an associated remote control, prevents accidental misplacement or accidental confinement of the remote control in a locked storage box on the motorcycle. The anti-theft device includes a main switch and a remote control holder integrated with a handlebar locking module. When an unlocking signal is transmitted from the remote control, the locking of a handlebar may be released by a handlebar locking actuator only when the remote control is inserted into the remote control holder, thereby actuating a main relay driving circuit so that power is supplied to electric equipment and the motorcycle's engine can be started.

Abstract: A system for providing vehicle location information or confirmation of remote entry system operation to a user. In one embodiment, a vehicle transceiver receives a wireless vehicle device function signal, and a vehicle controller generates a vehicle device control signal for use in operating a vehicle device in response. The vehicle controller also confirms operation of the vehicle device, and the vehicle transceiver transmits a wireless vehicle device function confirmation signal. A remote unit includes a transceiver for operation by the user for transmitting the vehicle device function signal and for receiving the vehicle device function confirmation signal. The remote unit also includes an indicator for providing an indication to the user confirming operation of the vehicle device, and a storage device for storing retrievable data representing the indication confirming operation of the vehicle device.

Abstract: The method of making secure a hands-free access and/or starting system for a motor vehicle, the hands-free system a control unit (2) placed in the vehicle and a portable identifier (1) suitable for communicating remotely and cordlessly with the control unit in order to be authenticated, the method consists in recording (30) a first data item in the identifier by communicating with the control unit in response to detecting starting of the vehicle engine, and in recording (60) a second data item to replace the first data item in the identifier by communicating with the control unit in response to detecting normal stopping of the vehicle engine. In the case of lending of the vehicle, the borrower of the vehicle must return an identifier containing the second data item in order to prove that he left the vehicle in an authorized manner.

Abstract: A keyless entry apparatus includes an on-vehicle transmitting and receiving device mounted on a vehicle, and a portable transmitting and receiving device. The on-vehicle transmitting and receiving device has a plurality of antennas mounted close to members to be controlled of the vehicle, and a plurality of transmitting sections which are connected to the plurality of antennas and which transmit request signals having unique antenna IDs. The plurality of transmitting sections intermittently transmit request signals from the corresponding antennas. When the portable transmitting and receiving device receives any of the transmitted request signals, the portable transmitting and receiving device transmits an answer signal which controls the member to be controlled corresponding to the transmitting section which transmitted the received request signal.

Abstract: A first transmitting antenna (10) transmits an ID request and a receiving antenna (18) receives a response from a portable device. The received response includes an ID, which is checked with IDs stored in a memory (28). If the checking is successful, the lock is opened by a door lock (30). Contrarily, if the checking fails several times continuously, transmission of the ID request from the first transmitting antenna (10) is suspended for a predetermined time. Thereby even if the ID request competes with the ID request from a second vehicle, the portable device can respond the ID request from the second vehicle. Transmission of an ID request is preferably inhibited by judging the request to be fraudulent when the checking fails several times continuously.

Abstract: A security system to enable authenticated access of an individual to a protected area, including a remote control unit (22) with a transponder (28), carried by the individual, which transmits an identification code group on reception of an interrogation signal. A control unit located within the protected area transmits an interrogation signal when activated by the individual, and verifies the identification code group received from the transponder. Access to the protected area will only be permitted on positive verification of the right to access. The transponder (28), contained within the remote control unit (22), is a passive transponder which obtains a supply voltage from the interrogation signal transmitted by the control unit (16) and then feeds this to a supply voltage rail.

Abstract: Keyless entry systems generate a signal to actuate a security system on a vehicle when keyless entry system is outside of a range of the vehicle. The signal is transmitted to the vehicle once the keyless entry system is within range. In a first embodiment, the signal continues to be sent periodically over a period of time such that the operator can move within range of the vehicle. In a second embodiment, the request signal is stored at the keyless entry system until the keyless entry system receives a signal from the vehicle, which then indicates the keyless entry system is within range of the vehicle. At that time, the signal is sent to the vehicle. This invention facilitates the use of keyless entry systems for a person carrying a number of packages, such that the operator need not actuate the keyless entry system when approaching the vehicle.

Abstract: A vehicle remote control system includes a multi-bank remote transmitter to be carried by a user and having selectable signal banks, such as for different vehicles. The vehicle remote control system also includes a controller at the vehicle that is switchable to a first mode for learning at least one signal bank from the remote transmitter based upon transmission therefrom to define a learned operable signal bank for thereafter controlling at least one corresponding vehicle function. The controller is also switchable to a second mode for deriving at least one other operable signal bank based upon the learned operable signal bank so that the controller is responsive to the remote transmitter without learning the other signal bank. Accordingly, in some embodiments the controller may be responsive to the multi-bank remote transmitter irrespective of the selected banks.

Abstract: In a vehicle remote-control system, an anti-theft unit includes a vehicle control module, which can receive a disarm signal directly from a signal transmitting key, and which can change from an armed state, in which an inactive state of an ignition system is maintained, to a disarmed state, in which the ignition system is activated, upon receipt of the disarm signal. A starting unit includes a starting device, which generates an enable signal upon receipt of a starting control signal from a remote controller, and which controls starting operation of the ignition system when the vehicle control module is at the disarmed state and the starting device receives the starting control signal. A signal connector is enabled by the enable signal so as to relay the disarm signal from the key to the vehicle control module.

Abstract: A process for the bidirectional transmission of data, in a hands-free vehicle access system, comprising the step of setting up a remote exchange of data between a recognition device installed in the vehicle and an identifier intended to be carried by a user, access being authorized only when the recognition device has authenticated the identifier, and the steps of setting up an exchange of data at the same radio frequency (RF) exchange between the recognition device and the identifier, and in delaying, in the course of this exchange, the transmission of a response signal by the identifier to the recognition device by a predetermined duration with respect to the reception by the identifier of an interrogation signal transmitted by the recognition device, so that neither the recognition device nor the identifier operate simultaneously in transmission and in reception at the RF exchange.

Abstract: A device for initiating an authorization request for a vehicle includes a first switching arrangement, whose operation initiates an authorization request. The first switching arrangement is disposed in a recess of a door handle of the vehicle so that the recess houses a switching surface of the first switching arrangement.

Abstract: An authorization checking system for motor vehicles, in which a control unit in the motor vehicle, having a portable user-transponder, in an inquiry-response dialog using data exchange, checks, and allows or blocks, the authorization for unlocking or locking the vehicle doors as well as for starting or driving. In order to be able to modify the identifiers of user-transponders and components of the motor vehicle in a security-relevant manner, a so-called master-transponder is provided in addition to one or a plurality of user-transponders. The master-transponder has a particular, vehicle-specific identifier, using which, in a special-inquiry-response dialog, the authorization to carry out and complete special functions within a preselected scope, going beyond the access and start/drive authorization, can be checked, and allowed or blocked. For carrying out the special functions, the master-transponder has acoustical and/or optical display devices and/or input devices.

Abstract: A keyless entry system for a vehicle is provided, on the vehicle, with detection distance setting circuit for changing a detection distance within which an electronic key can receive an activation signal. By carrying out predetermined operations, the keyless entry systems enters an adjustment mode wherein the detection distance can be changed by the detection distance setting circuit. With this configuration, the detection distance can be adjusted while the keyless entry system is mounted on the vehicle, whereby it is possible to attain a system causing no malfunction and ensuring high levels of security.