Abstract: A device for wireless transmission of electrical energy to an energy receiver, including a support surface, on which the energy receiver is arranged during energy transmission. The device includes an induction coil for transmitting electrical energy and an air duct extending within the device from an opening formed in the support surface into the device. The opening is arranged over the induction coil. The air duct is routed through a winding of the induction coil, which is preferably arranged directly under the support surface. Advantageously, the support surface is essentially rectangular, and the opening is formed on or at least close to a longitudinal axis of the support surface and is formed at a distance from an edge of the support surface. At least one projection is formed on the support surface for holding the receiving unit at a distance from the support surface so that air conducted into the air duct can better flow underneath.

Abstract: A voice assistance device (1) for motor vehicles, which can be arranged in the interior of the motor vehicle, has a display (2), which is configured on the front of the voice assistance device (1), at least one microphone (3), which is disposed in or on the display (2), and a loudspeaker, by means of which audio signals of the voice assistance device (1) can be output into the interior of the motor vehicle. In order to achieve the best possible sound in the interior of the motor vehicle, the invention proposes that the loudspeaker has a sound outlet opening (4) which is arranged on the front side of the voice assistance device (1) comprising the display (2) and the microphone (3).

Abstract: A particle-measuring system for determining particle mass concentrations in aerosols has a laser diode serving as a radiation source and projecting a beam of laser light through a flowing stream of the aerosol. A receiver for receiving the light from the diode after passing through the stream and converting the received light into a measurement. A frequency radiation output of the laser diode is modulated such that the frequency is substantially greater than a cutoff frequency of the receiver so that a specifiable radiation output of the laser diode is achieved on average over a duration of a measurement signal of the receiver.

Abstract: A sensor system for determining extension or tension in a seat belt of a seat-belt system in which the belt extends from and can be wound up on a retractor. The system has an electrical conductor extending longitudinally along the belt, a retractor for paying out and winding up the belt and the conductor thereon, and n electrode juxtaposed with the retractor. A controller connected to the conductor applies an electrical voltage to the conductor and is also connected to the electrode for detecting the voltage in the conductor.

Abstract: A particle-measuring apparatus (1) has an optical particle sensor (2, 3, 5, 6). By means of the optical particle sensor (2, 3, 5, 6) a particle mass concentration in an aerosol volume can be detected. Furthermore, the particle-measuring apparatus (1) has a measurement chamber (7), in which the aerosol volume to be examined with regard to the particle mass concentration by means of the optical particle sensor (2, 3, 5, 6) can be received, and a conveying device (11), by means of which the aerosol can be introduced into the measurement chamber (7). In order to prevent the particle-measuring apparatus (1) from being adversely affected during operation as a result of dirt or particle deposits, it is proposed that the delivery rate of the conveying device (11) of the particle-measuring apparatus (1) is adjustable.

Abstract: A particle-measuring apparatus (1) for determining the particle mass concentration in aerosols having different properties has an aerosol photometer (2), by means of which a photometer measured value, which is dependent on the particle mass concentration in the aerosol, can be measured, and an evaluation unit (9), into which photometer measured values measured by the aerosol photometer (2) can be input and in which the input photometer measured values can be processed in order to output corrected particle mass concentration values.

Abstract: A seat-occupancy and occupant-class detector for a vehicle seat having a back part and a seat part has an insulated but conductive surface element mounted on the seat part of the vehicle seat roughly parallel to a seat cushion thereof. A signal generator feeds an electrical measuring signal to the surface element, and first and second receiving electrodes are provided in the backrest at different spacings from the surface element but vertically level with each other such that the measuring signal of the surface element induces different voltages in the receiving electrodes. Calculation and evaluation steps performed in an evaluation unit take as their basis a value that is a quotient of different measurements for the same physical size and is therefore dimensionless. The reason for this is the arrangement of the two receiving electrodes at a different spacing from the conductive surface element on the seat cushion side.