Control loop performance monitoring

Control loop monitoring can be used to improve the performance of processes in industry. The monitoring tools presented are concerned with reducing the output variance of regulation loops. As a result, three different estimators are used to determine the minimum achievable output variance, the time delay and the static input-output relationship of the process. These three properties can be used together or individually to provide insight into the process. Once the methods are introduced and their algorithms outlined, the monitoring tools are tested via computer simulation and data from industrial processes. These results show the success of the estimation methods and the benefits to be obtained from monitoring the process.<>