Endress + Hauser Gmbh + Co. Kg

Endress+hauserse+co. Kg

Karlsruher Institut Fur Technologie

Michael Siegel

Tobias Brengartner

Martin Urban

Dietmar Frühauf

Gerd Bechtel

Max Bauer

Martin Hortenbach

Frank Ruhnau

Brengartner Tobias

A method for determining and or monitoring at least one process- and/or system specific parameter in automation technology. An oscillatable system is provided, which interacts with a medium located in a container, wherein the oscillatable system is excited to oscillate via a real input signal, wherein the real output signal of the oscillatable system is ascertained, wherein the real output signal is digitized and a real output sequence yu(k) is produced. The real input signal is digitized and a digital input sequence (u(k)) is produced, wherein the digital input sequence (u(k)) is fed to a function block (model), which provides at least one mathematical model of the oscillatable system in interaction with the medium. The mathematical model is defined by a number of process- and/or system specific parameters, wherein via the mathematical model a virtual output sequence (ym(k)) is produced, wherein the virtual output sequence ym(k) is compared with the real output sequence yu(k). In the case of a deviation, at least one process- and/or system specific parameter of the mathematical model is adaptively changed, until the deviation between the virtual output signal and the real output signal of the oscillatable unit lies within a predetermined tolerance range and wherein at least one of the process- and/or system specific parameters is provided.

Method for determining and or monitoring at least one parameter in automation technology

A method and an apparatus for determining or monitoring a predetermined fill level, a phase boundary or a density of a medium in a container with an oscillatable unit. The oscillatable unit is placed at the height of the predetermined fill level and is excited to oscillate successively with discrete exciter frequencies following one another in a frequency scanning operation (sweep) within a predeterminable frequency band in the working range of the oscillatable unit. The corresponding oscillations of the oscillatable unit are received in the form of received signals; wherein that exciter frequency is ascertained in the frequency scanning operation, at which the oscillatable unit oscillates with an oscillation frequency, which has a predetermined phase shift between the transmission signal and the received signal; and wherein the transmitting/receiving unit excites the oscillatable unit to oscillate with the ascertained oscillation frequency.

Method for determining or monitoring a predetermined fill level, a phase boundary or a density of a medium

A method for operating an apparatus which has an oscillatable unit. The oscillatable unit is excited to oscillate by means of a first frequency sweep within a predetermined frequency band with successive, discrete exciter frequencies of increasing or decreasing frequency. A first exciter frequency is ascertained, in the case of which, during the first frequency sweep, at least one predeterminable criterion is fulfilled. The oscillatable unit is excited by means of a second frequency sweep, wherein the frequency band, compared with the first frequency sweep, is run through in the opposite direction. A second exciter frequency is ascertained, in the case of which, during the second frequency sweep, the at least one predeterminable criterion is fulfilled. From the first exciter frequency and the second exciter frequency, via formation of an average, a measuring frequency for determining and/or monitoring at least one process variable is determined.

Apparatus and method for operating an apparatus for determining and/or monitoring at least one physical process variable

Growing community of inventors

Karlsruhe, Germany

Michael Siegel