Elsag International N.v.

Gregory Khrapunovich

Thomas J Scheib

Kenneth Alan Loparo

Douglas E Kyr

Marty Gulaian

Anti-windup and noise protection that can be used with any general digital controller. The anti-windup technique allows the implementation of noise filtering techniques to decrease or eliminate chatter of the control output at the limit. In a higher order controller that uses a feedforward signal, the anti-windup technique prevents an unexpected change in the control output when a step change occurs in the feedforward signal. The technique can be used to provide anti-windup protection in both single layer and multi-layer control schemes.

Windup and noise protection of digital controllers in a layered control

A distributed control system wherein status is propagated through the system along with the signal with which the status is associated. The function blocks of the system include rules for propagation of the status through the system. The system may also include function blocks for testing the propagated status to determine if the same is bad and function blocks to force the propagated status to have a certain status. The rules may be customized by the user, for example, to block status propagation through a function block.

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Mayfield Hts., OH, United States of America

Gregory Khrapunovich