.~.~> With rate (P. I. D.) (e.g., reset windup prevention)
DEFINITION
Classification: 318/609
(under subclass 560) Subject matter in which two error detectors are provided: One which detects the instantaneous positional errors and attempts to immediately correct for them. This detector contributes what is termed "proportional" control to the system. The second error detector senses the instantaneous position with respect to the long term average position. This detector contributes what is a termed "reset" or "integral" control to the system. The two signals are summed to provide a composite system error signal.
(1) Note. In the systems classified herein, the "reset" or "integral" control is provided to increase long term system stability and it is really a special form of "lag" circuit. A "lag" circuit is any electrical circuit which integrates.
(2) Note. Systems of this nature may control any type or process such as temperature control, fluid flow, a chemical condition, mixtures, etc., as a result the art is widely scattered.
SEE OR SEARCH THIS CLASS, SUBCLASS:
621, for systems which include lead and/or lag compensation.
SEE OR SEARCH CLASS 219, Electrical Heating,
497, for electric heating systems which may include reset control features.
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,
518+, for miscellaneous control circuits which may include reset features.
364, Electrical Computers and Data Processing Systems,
130+, for computer controlled manufacturing process controllers which may include reset features.
