Diagnosis method for a process valve, diagnosis module and process valve
AssigneeBuerkert Werke GmbH
InventorsKlaus Beck, Andreas Ungerer
Life of this patent
Estimating the term…
Abstract
A diagnosis method for continuous function monitoring of a process valve during normal operation. The diagnosis method includes the steps of determining process set data (S) with discrete-time process set values from an input signal supplied to the process valve, b) determining process actual data (s) with discrete-time process actual values using a displacement-measurement system assigned to the process valve, and c) analyzing the process actual data (s) dependent on the process set data (S) by comparing the process set data (S) and the process actual data (s) with each other to detect defined error states.
Claims17
A diagnosis method for continuous function monitoring of a process valve during normal operation, comprising steps of:
- a) determining process set data with discrete-time process set values from an input signal supplied to the process valve, wherein the process set data comprises a specified valve position,
- b) determining process actual data with discrete-time process actual values by means of a displacement-measurement system assigned to the process valve, wherein the process actual data comprises an actual valve position, and
- c) analyzing the process actual data dependent on the process set data by comparing the process set data and the process actual data with each other to detect defined error states,
- wherein, based on the determined process set data, an expected curve progression of expected process actual data is determined and the expected curve progression based on the process set data is compared with a curve progression of the process actual data, wherein a deviation identified between the expected curve progression and the curve progression of the process actual data is unique for a defined error so that the defined error states are detected on a basis of the identified deviation,
- wherein the defined error states comprise an insufficient mains pressure, a blocking of the process valve, a leakage, pressure surges and/or running-time changes.
A diagnosis method for continuous function monitoring of a process valve during normal operation, comprising steps of:
- a) determining process set data with discrete-time process set values from an input signal supplied to the process valve, wherein the process set data comprises a specified valve position,
- b) determining process actual data with discrete-time process actual values by means of a displacement-measurement system assigned to the process valve, wherein the process actual data comprises an actual valve position,
- c) analyzing the process actual data comprising the actual value position dependent on the process set data comprising the specified valve position by comparing the process set data and the process actual data with each other to detect defined error states,
- d) generating process actual reference data by storing process actual data comprising an actual value position as a function of process set data comprising a specified value position before and/or at a beginning of normal operation, and
- e) comparing process actual data with corresponding process actual reference data, wherein a running-time change is detected if rates of change of the process actual data differ from rates of change of the process reference data for identical process set data by a predetermined minimum value distance.
Dependencies are inferred from the claim text.