Patent Document ID: 20020052712
Application ID: 09923865
Patent Flag: 0

Claim One:
1. A method for the monitoring of a plant having a plurality of sub-systems which is operable at variable working points and comprising the following steps: a) respective measured values are detected for a fixed set of process parameters (B, U, S 1,..., SN) at pre-settable time intervals during the operation of the plant ( 1 ); b) the measured values detected in a learning phase for different working points are used to prepare models (M 1, M 2,..., MN) for the operating characteristics of the sub-systems ( 11, 12,..., 1 N), with the input values of each model (M 1, M 2,..., MN) being at least a part of the process parameters (B, U, S 1,..., SN) and the output value of each model comprising a model value (Yi, Yi k ) for at least one of the process parameters, and with the models (M 1, M 2,..., MN) being optimised by comparing the model values with the measured values; c) at least one monitoring parameter (Ri, Ri k ), which is independent of the respective current working point, is determined at pre-settable time intervals in an operating phase using the models (M 1, M 2,..., MN); d) the time-dependent course of the monitoring parameter (Ri, Ri k ) is used for the monitoring of the plant ( 1 ); characterised in that a pre-check ( 2 ) is carried out prior to the determination of the monitoring parameter (Ri, Ri k ), in which a check is made whether at least the measured values for those process parameters which are operating parameters (B) are within a pre-determined range.