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

摘要

PROBLEM TO BE SOLVED: To enable the use of slow or intermittently received process variable values in a predictor based control scheme without the need to change a control algorithm.SOLUTION: An embodiment includes a controller, such as a PID controller, and a predictor 204, such as a model based predictor, coupled to receive intermittent feedback in the form of, for example, process variable measurement signals from a process 202. 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 providing a new process variable estimate to the controller during each of controller execution cycles to enable the controller to produce a control signal used to control the process.