Performance monitoring of PI controllers using a synthetic gradient of a quadratic cost function
The paper shows how a synthetic gradient of a quadratic cost functioncan be used to monitor performance. The method requires a model of theclosed loop system. In the current paper this is obtained from therecommended tuning rule. The tuning rule requires a simple model of theprocess.The method is non-invasive, only closed loopdata from normal operation is used. By monitoring the gradient, informat