USE OF PREDICTORS IN PROCESS CONTROL SYSTEMS WITH WIRELESS OR INTERMITTENT PROCESS MEASUREMENTS

摘要

PROBLEM TO BE SOLVED: To enable the use of process variable values slowly or intermittently received in a control scheme based on a predictor without the need to change the control algorithm.SOLUTION: The control technique includes a controller such as a PID controller, and a predictor such as a model based predictor coupled to receive intermittent feedback in the form of, for example, process variable measurement signals from a process. The predictor, which may be an observer like a Kalman filter, or which may be a Smith predictor, is configured to produce an estimate of the process variable value from the intermittent or slow process feedback signals while switching to provide a new process variable estimate to the controller during each of the controller execution cycles to enable the controller to produce a control signal used to control the process.SELECTED DRAWING: Figure 3