Abstract: The invention relates to a device for determining at least one parameter of a medium flowing in a line, in particular the intake air mass of an internal combustion engine. The solid particles contained in the line act on a measuring element and influence a characteristic curve behavior of the measuring element, which is used to determine parameters of the flowing medium. In order to reduce the action of solid particles on the measuring element, the measuring element is disposed in a line or a tubular body downstream of a protective screen, and an element for influencing movement paths of the solid particles is disposed in the line, on an inner wall. By intentionally influencing the movement paths of the solid particles, their action on the measuring element is considerably reduced.

Abstract: A flow sensor in which all bridge resistor elements of a bridge circuit are arranged on a chip together with a heating resistor element, so that the drift of the bridge resistor elements will then have only a very slight effect on the output signal of the bridge circuit, which may be picked off at the electrical connections.

Abstract: A flow sensor for internal combustion engines in which the temperature control of a heating resistor element is implemented by pulse-width modulation.

Abstract: A flow sensor, in particular an air mass sensor, in which two heating resistors are used and a temperature sensor is assigned to each of these heating resistors. This makes more accurate and rapid measurement of the mass of air possible.

Abstract: A measuring element for a flow rate sensor is described, in which the number of terminals is minimized to reduce the dimensions of the measuring element.

Abstract: The invention relates to a method for compensating for the measurement deviation of an air flow rate sensor, which is disposed in a flow conduit, on the basis of soiling or aging. To compensate for the measurement error, it is proposed that the sensor be acted upon by an air surge and that the response time of the sensor be evaluated. The sensor error caused by the deposit of soil or by aging is finally corrected as a function of the response time.

Abstract: A pressure sensor having a sensor diaphragm for measuring pressure in combustion chambers of internal combustion engines, the pressure sensor being located in a housing, and high pressure and temperature fluctuations occurring in the combustion chamber. A heat shield made of a good heat-conducting material and provided with orifices is placed upstream from the sensor diaphragm to dissipate the heat to the housing surrounding the pressure sensor.

Abstract: A fiber-optic pressure sensor having a pressure measuring head including a housing which accommodates a diaphragm functioning as a pressure transducer and completing a translational movement under applied pressure and including at least one optical waveguide, the face of which is directed to the inside surface of the diaphragm and via which the light emitted by a light source is introduced into the pressure measuring head, the inside diaphragm surface having a pattern of highly reflective areas and areas of low reflectivity.

Abstract: A gas flow determination method and a corresponding gas flow determination device. A sensor device including a diaphragm and a frame enclosing it is provided; a predetermined temperature profile is created on the diaphragm; the gas flow to be determined is directed over the diaphragm in a predetermined direction of flow; the change in the temperature profile caused by the gas flow is detected; and the gas flow is determined on the basis of the change thus detected. The temperature at a third location on the diaphragm upstream from the first location and optionally at a fourth location downstream from the second location is regulated at a value corresponding to the local value of the predetermined temperature profile. In this manner, the effect of soiling on the diaphragm may be minimized effectively.

Abstract: A device including a bypass channel including a separating wall, which protects a measuring element, or, through a special arrangement of an inner wall surface, prevents foreign particles from flowing to the measuring element.

Abstract: A device for measuring the mass of a flowing medium with a temperature-dependent measurement element has a measurement conduit whose faces, which extend perpendicular to a surface fixed by the measurement element, are inclined and approach each other in the flow direction of the medium in the measurement conduit. The invention is provided for measuring the mass of a flowing medium to measure the intake air mass of internal combustion engines.

Abstract: A method and device for the correction of the dynamic error of a sensor are disclosed. The sensor output signal is fed to a filter circuit and a correction circuit to carry out said correction. The correction circuit is supplied with one or several filtered signals from the filter circuit and generates a corrected sensor signal from information derived thereby from a comparison of the filtered signals with the unfiltered sensor output signal, or a corrected signal derived therefrom, which is supplied to a further processing.

Abstract: A device for determining at least one parameter of a medium flowing in a line, in particular the intake air mass of an internal combustion engine, has a part provided for introducing into the line, having at least one measuring channel for conducting at least one subflow of the medium flowing in the line, and having at least one measuring element situated in the measuring channel for determining the at least one parameter, in which the part may be introduced into the line with a predetermined orientation with respect to the medium flowing in the line in the main flow direction.

Abstract: A device for measuring at least one parameter, in particular of a volumetric flow, of a medium flowing in a line, in particular of the intake air volumetric flow of an internal combustion engine, includes at least one measuring element around which the medium flows. Constrictions, which do not uniformly constrict the cross-section of the line, do not produce any ring-shaped eddies that may be heard in the form of whistling noises.

Abstract: A flow sensor (5) is described, in particular for analysis of gas flows, having a substrate (10) and at least one sensor component (15) which is sensitive to a flow of a medium, the sensor component (15) being separated from the substrate (10) in at least some areas by a region that is a poor heat conductor compared to the substrate (10). In addition, the region (11, 11′, 14) having poor heat conductivity is a porous silicon region (11) or a porous silicon oxide region (11′), or the region (11, 11′, 14) having poor heat conductivity is a recess (14) in the surface of the substrate (10) above which the sensor element (15) is situated on at least one web (13) which bridges the recess (14) and is at least mostly unsupported. The flow sensor (5) described here is particularly suitable for angle-dependent detection of a gas flow.

Abstract: Devices for determining at least one parameter of a flowing medium having an inner pipe according to the related art have the disadvantage that whirls are formed, which causes increased signal noise at the measuring element and pressure drop.

Abstract: A fiber-optic pressure sensor having a pressure measuring head including a housing which accommodates a diaphragm functioning as a pressure transducer and completing a translational movement under applied pressure and including at least one optical waveguide, the face of which is directed to the inside surface of the diaphragm and via which the light emitted by a light source is introduced into the pressure measuring head, the inside diaphragm surface having a pattern of highly reflective areas and areas of low reflectivity.

Abstract: Devices for measuring at least one parameter of a medium flowing in a line, having an inlet conduit an outlet conduit, having the disadvantage in the prior art that liquids flowing into the inlet conduit can reach a measurement element and alter the measurement characteristic curve behavior of the measurement element. A device of the invention has, between the inlet conduit and outlet conduit, a deflection conduit with a separation element, by which the liquids are separated out and therefore do not reach the measurement element.

Abstract: A device for measuring at least one parameter of a medium flowing in a line, in particular the intake air mass of an internal combustion engine in which fluid particles and solid particles in the line influence a characteristic curve behavior of a measuring element which is used to determine a parameter of the flowing medium. A protective screen according to the invention deflects fluids and solid particles away from the measuring element in such a way that they are conveyed against an inner wall of the line. In addition, the device stabilizes the flowing medium by generating longitudinal eddies in a flow direction.

Abstract: A method for cleaning of a measuring element (1) passed over by a gas flow is arranged on a thin-walled membranous material (5). The measuring element (1) includes at least one heatable element (6, 7, 8; 10, 11), which is arranged on the membranous material, the membranous material being capable of vibrating. By means of a control apparatus (20) or a switching (22) associated with the measuring element, a periodic delivery of current (41, 42) in intervals takes place in this manner to at least one heatable element (6, 7, 8; 10, 11) of the measuring element (1) and thereby produces vibrations. Alternatively, vibrations of the membranous material (5) can be produced by special vibration exciters or by means of ultrasonic coupling.