摘要:
A device for measuring weight in a vehicle includes an expansion unit which becomes elongated under the influence of the weight being measured, and a sensor system which determines the elongation through a transit time measurement. Ultrasonic pulses are used for the transit time measurement.
摘要:
A method for producing a component is provided, in particular a deformation sensor, having a sensor element which includes at least one region that is sensitive with respect to expansion or compression, as well as electrical structures which are in connection therewith. To this end, a sacrificial layer is produced on or within a substrate and an activatable layer on top of the sacrificial layer, the sensitive region and at least a portion of the electrical structures being positioned on top or within an activatable layer, and a circumferential trench is produced around the region of the sensor element to be produced and having the sensitive region and the portion of the electrical structures, the trench being interrupted by at least one connecting point, which connects the region of the sensor element to the portion of the activatable layer lying outside the circumferential trench. This is followed by a removal of the sacrificial layer underneath the region of the sensor element, a fixation of the region of the sensor element with the aid of a holding device, rupturing of the connecting points and a transfer of the sensor element, fixated by the holding device, and connecting a carrier to the component as well as joining with a carrier to the component.
摘要:
A method of deciding with a high reliability whether an impact with the front side of a vehicle has been caused by a pedestrian is described. Two decision criteria are formed, and only if both decision criteria are met is it decided an impact with a pedestrian has occurred. The first decision criterion is determined by the fact that the pressures or deformations measured by a sensor on the bumper and a sensor in the area of the front edge of the engine hood are compared with reference quantities typical of impact with a pedestrian. The second decision criterion is determined by the fact that the changes in velocity and/or acceleration of the vehicle caused by an impact are determined, and then the changes in velocity and/or acceleration are compared with reference quantities which are typical of impact with a pedestrian.
摘要:
A magnetostrictive transducer wherein a magnetostrictive layer is applied to a flexible element, for example, a flexible beam. The flexible element is deflected by an external magnetic field. The thin magnetostrictive layer consists of Tb.sub.(1-x) Dy.sub.(x) Fe.sub.2.
摘要:
A method for operating an internal combustion engine is described. At least one composition of a gas mixture is determined in at least one combustion chamber of the internal combustion engine. At least one combustion chamber pressure is detected in the interior of the combustion chamber and at least one local combustion chamber temperature is detected in the interior of the combustion chamber. The composition is inferred from the combustion chamber pressure and the combustion chamber temperature.
摘要:
The invention relates to an economical pressure measuring device as well as to a favorable method for pressure determination, with which a pressure measurement can be performed from outside the high-pressure container. To that end, the device comprises an ultrasound transmitter mounted outside the pressure container and an ultrasound receiver by means of which transmitter and receiver the transit time of an ultrasonic pulse traveling through the liquid contained in the high-pressure container can be ascertained, and the method comprises generating an ultrasonic pulse outside the high-pressure container measuring the time that the ultrasonic pulse requires to traverse a defined distance calculating the pulse speed of the pulse in the liquid; and from that determining the pressure in the liquid.
摘要:
The microvalve according to the invention is comprised of an electromagnetic drive and of a multilayer lower valve part, which are permanently bonded to one another and are manufactured separately from one another. The lower valve part includes at least one armature and a valve-closure element, which are axially movable, as well as a housing which at least partially surrounds this axially movable component of the microvalve. The layers of the lower valve part are built up one upon the other by means of (multilayer) electrodeposition. The microvalve can be used in fuel-injection systems of internal combustion engines.
摘要:
A micro-actuator includes force elements and compensation elements arranged on a bending element such that a change in the environmental temperature does not cause any flexing of the bending element.
摘要:
A measurement sensor for analyzing a nonpolar liquid contains a field effect transistor that has an exposed gate contact for wetting with the nonpolar liquid, and an electrical shield that surrounds the gate contact and has openings for inflow and outflow of the nonpolar liquid.
摘要:
An ultrasound-based measuring device includes a measurement body, at least one ultrasonic transmitter for coupling ultrasonic measurement signals into the measurement body, and at least one ultrasonic receiver for detecting the ultrasonic measurement signals reflected at an end face of the measurement body. The at least one ultrasonic transmitter emits both a longitudinal and a transverse measurement signal. The influence of a physical disturbance variable on the measurement section traversed by the measurement signals during a determination of a measurement pressure prevailing at the end face and/or of a measurement temperature prevailing at the end face can be taken into account on the basis of the propagation times and a difference between the propagation times of the longitudinal and transverse measurement signals reflected at the end face.