Abstract: The invention relates to a temperature sensor comprising a sense element and being in contact with a housing configured as a contact wire of the temperature sensor. A contact wire arranged inside the housing, is configured concentrically and is held under spring tension with an angular spring. For testing purposes, a testing resistor, being connected parallel to the sensor element is proposed.

Abstract: A device for measuring a temperature of an exhaust gas flow in an exhaust branch of an exhaust gas section of an internal combustion engine is disclosed. A sub-region of the exhaust branch is configured as a parabolic mirror having a focal point positioned outside of the exhaust branch. The device includes a side channel member attached to the exhaust branch and having an open end adjacent to the exhaust branch and a closed end; and a radiation sensitive sensor disposed in the side channel member and at the focal point. The open end is in fluid communication with an interior of the exhaust branch through a cutout of the exhaust branch so that the sensor is coupled to radiation of the exhaust gas flow for measuring a temperature of the exhaust gas flow. A related method is also disclosed.

Abstract: The invention relates to a pressure sensor device comprising a membrane body in the form of a membrane whose first side is exposed to a working medium whereas the second side thereof is arranged oppositely to the first side. The inventive device also comprises at least one pressure sensor element (16, 18) for detecting the extension or compressive strain of the membrane body produced by the working medium pressure. A temperature sensor element (22) for detecting the membrane body temperature is mounted thereon.

Abstract: A circuit arrangement (1) for a photodiode (2) has a microprocessor (3) with an output (4) which emits a pulse-width-modulated voltage signal via a low-pass filter (5) to the cathode of the photodiode (2). The voltage which is applied to the cathode of the photodiode (2) is detected by an input (12) of the microprocessor (3) and is regulated at a nominal value by adjusting the voltage signal at the output (4) of the microprocessor (3). The circuit arrangement (1) has a particular wide dynamic measurement range.

Abstract: A radiation-measurement circuit for a photodiode has a microprocessor providing a pulse-width-modulated voltage signal via a low-pass filter to the cathode of the photodiode. The voltage which is applied to the cathode of the photodiode is detected via an input of the microprocessor and is regulated at a nominal value by adjusting the modulated voltage signal of the microprocessor. The circuit has a particularly wide dynamic measurement range.

Abstract: An antenna transponder configuration, in particular for power transmission and angle measurement is described. The antenna transponder configuration contains a stationary antenna device having at least two concentric coils with different mean radii, the mean magnetic flux in the interior of the coils approximately canceling itself out. At least one of the coils is in this case in the form of a meandering coil. A transponder, which is disposed such that it can rotate, has a configuration of coils that are inductively coupled to the magnetic field of the meandering coil. The transponder and the antenna device are separated from one another by an air gap.

Abstract: A micromechanical sensor is described which contains electrodes that are disposed on a substrate, and electrode bars made of silicon that can move with regard to the electrodes. A deformation of the substrate is measured by determining differential changes in a capacity of the electrode bars in comparison to adjacently disposed electrodes. Two groups of electrode bars are preferably used which are interlocked with one another in an alternating comb-like manner, which, are separate from one another, and are interconnected at the ends thereof in an electrically conductive manner, and which are anchored on the substrate.

Abstract: 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.

Abstract: In order to identify the position of a movable element, such as a lock bolt, a resonant circuit is subjected to the element or a part that moves with the element. The resonant circuit is thereby damped by the element in a position-dependent manner and oscillates in one end position of the element but is damped too greatly in the other end position. A microprocessor controls the switching on and the respective operating point of a transistor in such a way that switching hysteresis is obtained. The operating point can be automatically readjusted in an adaptation phase.

Abstract: A switch lever of an electrical switch can be moved into various switch positions. A ferrite core is disposed at the switch end of the switch lever. A primary coil and a secondary coil are disposed about each switch setting. The primary coil induces a voltage in each secondary coil. The amplitude of the induced voltage is greatest in the secondary coil in the vicinity of which the ferrite core is situated. The actually adopted switch position can be determined from the difference in the voltages.

Abstract: In a method for operating an anti-theft system and an anti-theft system operating according to the method, a stationary transceiver sends a question code signal to a portable transponder, which in turn responds with an answer code signal. The answer code signal is scanned at predetermined scanning times and a piece of code information is demodulated therefrom. If the first bits of the answer code signal are already unreadable, then the scanning time is displaced by a phase angle, and the remainder of the answer code signal is read.

Abstract: In an anti-theft system for a motor vehicle, an oscillating circuit of a transceiver in the motor vehicle is modulated with code information of a portable transponder. A demodulator detects the code information and carries it onward to a computer unit, where it is checked for authorization. Component tolerance or temperature changes can mean that initially no code information will be demodulated, despite a properly functioning transponder. According to the invention, the frequency of the modulated oscillation is then measured and reregulated to a command frequency.

Abstract: A device for transmitting data or energy supply from or to a transponder, especially for an anti-theft system in a motor vehicle, includes an antenna oscillating circuit which is induced to oscillate by an exciter variable. The oscillation is transmitted by transformer coupling to a transponder oscillating circuit. In order to make the transmission of energy or data as effective as possible, the current or the voltage in the antenna oscillating circuit is measured and compared with a desired variable. Upon a deviation, a correction value is generated by which the exciter current is increased or the resonant frequency is adapted to the exciter frequency as a consequence of the addition of an impedance to the antenna oscillating circuit.

Abstract: A device for controlling keyless access to a motor vehicle includes a transceiver to be carried by a user. A distance detecting device measures a distance between the transceiver and a motor vehicle. A transmitting unit being disposed in the motor vehicle and being associated with a tripping device broadcasts a question code signal when the tripping device is actuated. The transceiver has a receiver for receiving the question code signal, and the transceiver has a transmitter for broadcasting an answer code signal only whenever the motor vehicle is located in the immediate vicinity of the transceiver. A receiving unit disposed in the motor vehicle receives the answer code signal from the transceiver and furnishes an unlocking signal to an unlocking unit if the answer code signal matches a set-point code signal.

Abstract: An anti-theft system for a motor vehicle includes a portable transponder carrying code information. A stationary transceiver has an oscillator and an oscillating circuit being excited to oscillate by the oscillator at an oscillation being modulated by the transponder in synchronism with the code information. A demodulator demodulates the modulated oscillation of the oscillating circuit. According to one embodiment, the code information is obtained from the demodulated oscillation by sampling the oscillation at least at one predetermined sampling time. An arithmetic unit compares the code information with command code information and transmits an enable signal to a security unit if a match occurs. The modulated oscillation being shifted by a predetermined phase angle is sampled once again if initially no code information is recognized from the demodulator.

Abstract: A method for triggering a plurality of relay exciter coils connected parallel to a common voltage source includes turning each of the coils on and off with relay switching means associated with the coils, and triggering the respective coils to be turned on after reaching a response state thereof with a common clock generator having a given clock ratio, through the relay switching means, for establishing a steady state of a holding current being reduced relative to the response state. The method further includes turning off the coils with a common OFF-switch, keeping the respective relay switching means closed for those coils being intended to continue to be operated in the steady state of the holding current, for establishing a response current rising within a short time within the associated coil, and triggering the coil again with the clock generator having the given clock ratio after a predetermined period of time.

Abstract: Control device for controlling functions of a motor vehicle for a load dump having a computer for generating at least one control signal that is dependent on the level of the operating voltage feeding the control device. A power supply system generates an operating voltage that is supplied to a threshold switch. As long as the operating voltage is above a limit value in the load dump case, the threshold switch outputs a response signal to an evaluator. The latter then only supplies an output signal and thus reports the load dump case to a computer unit when the response signal lasts longer than a set time span.

Abstract: In a method for generating trigger or ignition pulses that control a periodic event of an internal combustion engine, a precalculation is required of a calculated running time T.sub.n+1 that a crank shaft of the internal combustion engine meets in order to traverse the respectively next of prescribed, constant allowed ranges WB.sub.n. For this precalculation, a real running time TE.sub.n is measured after every traversal of one of the allowed ranges WB.sub.n and the next, following running time is precalculated with an approximation. The precalculated value of this calculated running time T.sub.n+1 is derived from the equation:T.sub.n+1 =TE.sub.n -K.sub.n where K.sub.n =1/2.times.(T.sub.n -TE.sub.n).