Avl List Gmbh

Avl Gesellschaft Fur Verbrennungskraftmaschinen Und Messtechnik M.b.h.

Klaus Leitmeier

Gerhard Woss

Klaus-Christoph Harms

Rudolf Zeiringer

Andreas Stelzer

Rüdiger Teichmann

Martin Rzehorska

Paul Kirschbaum

Josef Moik

Robert Hauser

Stefan Scheiblhofer

Stefan Schuster

Gernot Fernitz

To reduce the complexity of an indicating systemon an internal combustion engine for determining a parameter, the invention provides that on the basis of the measured variable a computing unitfor the indicating systemcomputes crank angle information, and on the basis of the crank angle information thus computed and the measured variable determines an engine parameter.

Indicating system and method for determining an engine parameter

A plurality of exchangeable, different piezoelectric pressure sensors () comprise integrated SAW elements () as identification units whose identification data can be read by an interrogation unit () via a common connection cable (). The analysis unit () for the measurement signals and the interrogation unit () for the identification data can be connected by a common coupling unit () to the connection cable (). The coupling unit () has a coupling capacity () which connects with high frequency the interrogation unit () to the signal line of the connection cable (), as well as a coupling inductance () which connects with low frequency the load amplifier () of the analysis unit () to the connection cable (), thus neatly separating the useful signal from the identification signal and keeping a high-impedance measurement chain from the sensor () to the input of the load amplifier (). An SFSCW radar can further be used to improve interrogation of the identification data.

Measurement system for measuring cylinder pressure in an internal combustion engine

The invention involves a marked plate for a rotational angle sensor element for rotating structural parts, with many angle marks provided preferably oriented radially to the rotational axis and preferably arranged in the form of a collar arranged concentrically to the rotational axis and with at least one reference mark, which is formed by an angle mark that deviates in its modulating properties and thus is integrated in the collar of the angle marks. An angle sensor element system for rotating structural parts includes a marked plate that can be coupled to the rotating structural part and that merely has a collar of angle marks with integrated reference marks and a fixed scanning unit for it, including at least one transmitter of electromagnetic radiation and at least one receiver for the radiation modulated by the marked plate, as well as mechanisms for connection to an evaluation unit. In order to distinguish the reference marks with certainty from the remaining angle marks, a process for determining a reference value from an analog signal provides that for each angle and reference mark, from an analog peak value of the preceding angle marks, an peak value continuing the trend of peak values is determined and is used in the evaluation unit, changed by a defined value, as a threshold for the presence of the reference value that deviates in its modulation.

Marked plate for a rotational angle sensor element, an angular sensor element for rotating structural parts, and a process for determining a reference value

Measuring device for determining distance

A charge amplifier circuit for balancing drift between periodically occurring measured signals includes a drift-compensating device with a sample/hold unit which is triggered by a trigger device in accordance with the period of the measured signals. The trigger device is connected for supplying trigger pulses, so that the drift at an output of the charge amplifier, determined at the end of a compensation period, can be taken into account by the sample/hold unit to supply a compensating current to an input of the charge amplifier. The triggering of the sample/hold unit can be performed by external or internal triggering arrangements, so that simple measurements can be undertaken without a large outlay of equipment.

Charge amplifier circuit with drift compensation

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Graz, Austria

Klaus Leitmeier