Carl Schenck Ag

Josef Wehhofer

Joachim Voegele

Hans Werner

Volker Tews

Harald Wolf

In a process for monitoring a machine or installation, signals from sensors positioned on components of the machine or installation are transmitted to a signal-conditioning unit. Conditioned sensor signals from the signal-conditioning unit are further processed. The machine or installation components to be monitored are mapped in machine or installation objects, and the machine or installation objects are combined. Ultimately, rule-based monitoring statements are obtained utilizing the combined objects.

Process for monitoring a machine or installation

The accuracy of the output feed rate or output feed quantity of a differential dosing scale is increased by eliminating from the respective feed rate signal or output quantity signal measuring disturbance that can adversely influence the output accuracy. For this purpose, the size of the output signal variations or of the feed rate variations are processed in a fuzzy logic circuit (9) which allocates the respective signals to fuzzy sets, e.g. 'small', 'medium', 'large' in accordance with type and size of the disturbance or interference. The fuzzy logic circuit (9) forms a filter control signal that corresponds to a filtering degree or filter factor. The filtering control signal controls the time constant of a time variable filter (6) through which the differentiated signal coming from the dosing scale load cells is passed prior to processing in the fuzzy logic circuit (9).

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Darmstadt, Germany

Josef Wehhofer