IMPROVED KALMAN FILTERS IN PROCESS CONTROL SYSTEMS

摘要

PROBLEM TO BE SOLVED: To enable the use of received process variable values in a Kalman filter based control scheme without the need to change a control algorithm.SOLUTION: An embodiment includes a controller, and a Kalman filter that is coupled to receive feedback in the form of process variable measurement signals from a process. The Kalman filter is configured to produce an estimate of the process variable value from slow or intermittent 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. The Kalman filter is also configured to compensate the process variable estimate for process noise with a non-zero mean value that may be present in the process. The Kalman filter may apply this compensation to both continuously received process variable values and intermittently received process variable values.