Abstract: A method and device for evaluating a number of reflector responses of a system for detecting the occupancy of a seat. Decision values are determined from reflector responses of different areas of a seat according to determination rules assigned to the individual areas. The decision values are classified according to a threshold value rule in order to determine an evaluation result.

Abstract: A method determines reference values that are used for calculating the damping thickness d in a seat occupancy recognition system. Several reflector answer empty values are initially measured for an unoccupied seat, the empty values being, for example, allocated, respectively to a predetermined seat position of the seat and a specific reception antenna. A reflector answer reference value allocated to a seat reflector or the seat is determined with the aid of a predetermined algorithm and from the measured reflector answer empty values.

Abstract: A single high-frequency transmitter emits radiation in a vehicle (1) comprising several seats (2), said high-frequency radiation being reflected depending on whether a seat is occupied, transmitted to a receiver and evaluated with regard to the radiation intensity. In addition, the reliability of the identification is increased, even when the occupant is out of position, by the provision of at least one reflector (9) per seat in or on an allocated seat-belt (6).

Abstract: Disclosed is a system for detecting seat occupancy in a vehicle, comprising a microwave transmitter and several reflectors which are provided with a small area and are disposed within a vehicle seat, especially within the backrest of the vehicle seat. A greater or smaller number of reflectors are enabled if a person occupying the seat leans forward, resulting in a jump in intensity each time an additional reflector is enabled. Said jumps in intensity can be used in an advantageous manner for detecting the exact position of the person on the seat. In particular, an airbag can be prevented from deploying and the risks associated therewith can be avoided when the person leans far forward. Alternatively, receivers can he disposed within the seat instead of reflectors.

Abstract: A seat occupancy detection device contains at least one transmitting apparatus and at least one receiving apparatus located at a position in a seat which position is distanced from the at least one transmitting apparatus such that a person occupying the seat will be situated at least partially in the signal path between the at least one transmitting apparatus and the at least one receiving apparatus for influencing the signals as a function of seat occupancy. In this manner, occupancy of the seat is effectively detected.

Abstract: The invention concerns a system for determining seat occupancy in a motor vehicle, said system comprising a microwave transmitter (10), a microwave receiver (10) and preferably a reflector (12). If a person is between those appliances, the microwave radiation is attenuated. The reflector (12) can be a backscattering device, such that the radiation received by the receiver (10) is unequivocally associated with the reflector (12). Furthermore or alternatively, the transit time of the microwaves can be measured, to be subsequently processed in combination with an analysis of the seated position of passengers. In preferred embodiments, the microwave radiation diffraction properties around an object are also used to obtain the seated position of passengers. The determination of a seat occupancy and optionally of seat occupancy mode can be advantageously used for locking or on the other hand releasing an airbag.

Abstract: In a method for self-diagnosis of a system for seat occupancy detection, in particular for self-diagnosis of a HOBBIT system, a self-diagnosis signal that has been modulated in a predetermined manner is transmitted by the transmit unit to the receive unit of the base station and analyzed, preferably with the reflectors deactivated. From the analysis it is possible to make deductions about the operational integrity of the base station.

Abstract: A classifying seat occupancy detection device is used to classify whether a particular seat is occupied by an adult, an infant or not at all. Depending on the classification the door lock assigned to the seat is automatically switched either to a childproof mode or to a non-childproof mode, without the vehicle driver having to do anything.

Abstract: The invention relates to a device for occupant protection in a motor vehicle and for anti-theft protection of the motor vehicle, comprising an airbag (3), which may be inflated with gas by means of a filling device, a transceiver (5), for electromagnetic waves (6) and an occupant protection analytical unit (81) connected thereto. An occupant protection interrogation unit (41) is arranged on the inflatable airbag (3), which is wirelessly interrogated by the transceiver (5). Information on the degree and/or speed of unfolding of the airbag is thus provided to the occupant protection analytical unit (81). The transceiver (5) may furthermore wirelessly interrogate a portable anti-theft interrogation unit (42), for example, a chipcard and hence provide an anti-theft analytical unit (82) with information about the authorisation of the anti-theft interrogation unit (42) and/or the separation of the anti-theft interrogation unit (42) from the transceiver (5) based on the returned signal.

Abstract: A system, for recognition of seat occupancy in a vehicle, comprises a microwave transmitter (10), a microwave receiver (10) and preferably a reflector (12). If a person is located between said objects the microwave radiation is thus weakened. A back-scatter device can be used as reflector (12), such that radiation received by the receiver (10) can be unambiguously assigned to the reflector (12). In addition or alternatively a run-time measurement for the microwave radiation can be carried out and the above further processed with an analysis of the seat position. It is possible to use the refraction properties of the microwave radiation around the object in order to obtain further information about the seat position. The recognition of whether and optionally how a seat is occupied can preferably be used for the locking or activation of an airbag.

Abstract: Disclosed is a device comprising a transceiver (9) which transmits HF signals that are reflected back by means of reflectors (6) located in the seats. Diagnostic reflectors (10) are disposed at the edge of the seats in order to diagnose the reflectors (6). Said diagnostic reflectors (10) are disposed such that the diagnostic reflectors are normally not covered up by a person (1) sitting on a seat (2). The diagnosis is carried out at the same time as the person is identified.

Abstract: The device has a transceiver which transmits high-frequency signals, which are reflected back by reflectors in the seats. Occupied seats are detected on the basis of signal propagation delays and/or reflector detections and/or receiving intensities. In addition, it is possible to detect with the aid of a belt sensor whether or not a safety belt is fastened.

Abstract: The position and the weight of a person, in particular a person on a motor vehicle seat, is determined. Reflectors are used to reflect electromagnetic radiation from a transceiver. The attenuation of the sensor reflector radiation enables a report on the seat position of a person in the radiation path. An antenna of each sensor reflector is connected to an electrical load assigned thereto, which is dependent on the weight of the person acting upon it. Depending on this weight, weight information about the person is superimposed by the load onto the reflected sensor reflector signal. The reflected sensor reflector signal is received by the transceiver and fed to the evaluation unit after a signal pre-processing, which enables the weight information of the person to be evaluated.

Abstract: A portable encoder transmits a response signal, which contains code information that is specific to the encoder (2). The code information contained in the received response signal is compared with reference code information in a receiving unit (4), which is located in the object and is connected to an evaluation unit (9). In addition, both the distance of the encoder (2) from the receiving unit (4) and the receiving level of the response signal are measured on the object side and the position of the encoder (2) is calculated from the measurements. This permits a differentiation to be made between the exterior and interior regarding the position of the encoder (2). Access is released and authorization is granted, only if the position of the encoder (2) is identified as permissible.

Abstract: A known PASE system is significantly improved by the addition of a LF field, which is restricted to the interior of the motor vehicle, for the purpose of achieving highly reliable differentiation between the inside and outside of the motor vehicle. A LF signal in this field, in the form of a LF ping, is used as a control signal with the function of differentiating between the area inside and outside the motor vehicle and for awakening or activating a semi-active identification transmitter CID. In preferred embodiments, the LF ping itself is preferably not used for data transmission, which continues to be handled in the GHz band, so that the system as a whole also operates very rapidly.

Abstract: A system for detecting the seat occupancy in a vehicle includes a microwave transmitter (10) and a plurality of small-area reflectors (12) which are arranged in the vehicle. By activating or deactivating the different reflectors (12) during different time intervals, the reflectors (12) can be identified via the unequivocal assignment between the time intervals and the reflectors. This makes it possible to use narrow-band microwave radiation, since it is then not absolutely necessary to identify the reflectors (12) with the aid of different frequencies. It is also possible to arrange receivers in the seat (20) instead of reflectors (12).

Abstract: Taking as a starting point known security apparatuses and their methods for distance-dependent initiation of functions in or at an object, the reliability of distance measurements is essentially increased by carrying out a series of distance measurements, an associated quality value (G) being calculated by a mathematical function in each case for the measuring results (M1-M5, R1, R2) of said distance measurements. Only those measured values which fall below a certain quality value (Krit) as a threshold value are generally accepted for an analysis in respect of initiating a distance-related function. Developments provide for selecting measured values beforehand with reference to a level measurement, in order to further increase the reliability, or applying methods of statistical analysis subsequently.

Abstract: A method for determining the position of at least one second transmitting and receiving device (3) in respect of a first transmitting and receiving device in a passive access control system operating in the GHz range, comprising the steps of using a radar method, wherein signals (f1, f2) are received in the first transmitting and receiving device on the left-hand side and right-hand side of a modulation frequency (fmod), determining the distance of two signals (f1, f2) closest to the left-hand side and right-hand side modulation frequency (fmod) wherein the distance is proportional to the distance between the first transmitting and receiving device and at least one second transmitting and receiving device (3), so that multipath propagations are not taken into consideration.

Abstract: An antitheft protection system for a vehicle (10) comprises at least one transmitting and receiving unit (12) connected to the vehicle (10), at least one code transmitter (18), which can communicate with the at least one transmitting and receiving unit (12), and at least one base unit (14), which can communicate with the at least one transmitting and receiving unit (12).