On-line Control Performance Monitor with Robust Properties

Abstract- A Control Performance Monitor (CPM) as a software agent is developed for assessment the SISO control loops behaviour. A dedicated system for data pre-processing is applied in order to guaranty robust properties of the extracted process features. Using a fuzzy and rule based evaluation procedure an overall performance index is also calculated from the estimated indicators. The CPM provides early warning information when an inadmissible performance is detected. Some results of experimental verification of the CPM are reported. Recently so-called ASPECT * control system has been developed addressed to non-linear, slowly time-variant and/or highly delayed processes typical for chemical and related industries [11]. This system has been implemented with commercially available programmable logic controllers (PLCs). ASPECT control system is designed as a set of software modules. The core of the ASPECT control system is so called “run-time ” module (RTM), which executes the main control functions (control algorithms, tuning, process model updating, assessment of the control quality, coordination of tasks etc). The RTM is based on three control algorithms